阅读说明：本技术 飞灰清洗方法 (Fly ash cleaning method ) 是由 陈磊 叶健欣 张燊华 张宇鹏 于 2020-12-28 设计创作，主要内容包括：本发明公开了一种飞灰清洗方法,包括如下步骤：a、将飞灰与酸性溶液混合,恒温搅拌,得到混合液；b、抽滤,保留滤渣；c、将滤渣经水清洗；d、将清洗后的滤渣与二价铁盐溶液混合,并恒温搅拌；e、抽滤,保留滤渣；f、将滤渣与水混合；g、搅拌抽滤,得到滤渣；h、重复步骤f至步骤g1次～3次。本发明提供的飞灰清洗方法,先通过酸洗,将飞灰进行预处理,然后抽滤得到滤渣,然后通过清水对滤渣进行清洗,得到酸处理后的飞灰滤渣,将滤渣与二价铁盐混合,通过二价铁盐将飞灰中的率离子夺取,然后通过清水清洗去除,通过该方法,最终可以将飞灰中的氯元素去除率高达99％。(The invention discloses a fly ash cleaning method, which comprises the following steps: a. mixing the fly ash with the acidic solution, and stirring at constant temperature to obtain a mixed solution; b. performing suction filtration, and keeping filter residue; c. washing the filter residue with water; d. mixing the cleaned filter residue with a ferrous salt solution, and stirring at constant temperature; e. performing suction filtration, and keeping filter residue; f. mixing the filter residue with water; g. stirring and filtering to obtain filter residue; h. repeating the steps f to g1 times to 3 times. The method for cleaning the fly ash comprises the steps of firstly carrying out acid washing, pretreating the fly ash, then carrying out suction filtration to obtain filter residue, then cleaning the filter residue through clear water to obtain the fly ash filter residue after acid treatment, mixing the filter residue with ferrous salt, capturing ions in the fly ash through the ferrous salt, and then cleaning and removing the ions through the clear water, wherein the removal rate of chlorine elements in the fly ash can be up to 99 percent finally.)

1. A fly ash cleaning method is characterized by comprising the following steps:

a. mixing the fly ash with the acidic solution, and stirring at constant temperature to obtain a mixed solution;

b. performing suction filtration, and keeping filter residue;

c. washing the filter residue with water;

d. mixing the cleaned filter residue with a ferrous salt solution, and stirring at constant temperature;

e. performing suction filtration, and keeping filter residue;

f. mixing the filter residue with water;

g. stirring and filtering to obtain filter residue;

h. repeating the steps f to g1 times to 3 times.

2. A fly ash washing method according to claim 1, wherein in step a, the acidic solution is hydrochloric acid or acetic acid.

3. A fly ash washing method according to claim 1, wherein in step d, the ferrous salt is ferrous oxalate, ferrous citrate or ferrous sulfide.

4. A fly ash washing method according to claim 1, wherein in step a, the mass ratio of the fly ash to the acidic solution is 1:7 to 1: 12.

5. A fly ash cleaning method according to claim 1, wherein the pH of the mixed liquid in step a is in the range of 7.1 to 7.8.

6. A fly ash washing method according to claim 1, wherein the fly ash is formed by incineration of domestic waste.

7. A fly ash washing method according to any one of claims 1 to 6, wherein steps b to c are repeated at least twice.

Technical Field

The invention relates to the field of environmental purification, in particular to a fly ash cleaning method.

Background

Prior art of

The components contained in the fly ash from refuse incineration are similar to those of fly ash, and can be used for producing cement instead of lime, and at the same time the temperature in the cement kiln can be up to 1500 deg.C, the heavy metals in the fly ash can be solidified in the cement production process, and the dioxin can be completely destroyed. The firing of cement by using fly ash in Japan has been industrialized, and China has also studied and tried. The main current symptoms are that the fly ash contains more chloride, and chloride ions in the raw materials of cement directly influence the calcination of a preheater and a kiln in the novel dry-process cement production, so that accidents such as ring formation, material blockage and the like are caused, and the normal operation of equipment and the quality of cement clinker are influenced. The chloride ion content of the raw materials must be controlled in the cement production process. In addition, the chlorine in the fly ash can also cause the formation of dioxin in the flue gas of the cement kiln; therefore, when the fly ash is used for producing building materials, reliable and effective measures must be adopted to remove chlorine in the fly ash; the pretreatment such as water washing is one of effective dechlorination methods, and international research is very active at present. However, the effect of water washing to remove chlorine and the optimum parameters are not clear, and we have conducted experimental studies on this.

Disclosure of Invention

In order to solve the above technical problems, the present invention provides a method for cleaning fly ash.

The method comprises the following steps:

a. mixing the fly ash with the acidic solution, and stirring at constant temperature to obtain a mixed solution; b. performing suction filtration, and keeping filter residue; c. washing the filter residue with water; d. mixing the cleaned filter residue with a ferrous salt solution, and stirring at constant temperature; e. performing suction filtration, and keeping filter residue; f. mixing the filter residue with water; g. stirring and filtering to obtain filter residue; h. repeating the steps f to g1 times to 3 times.

Preferably, in step a, the acidic solution is hydrochloric acid or acetic acid.

Preferably, in step d, the ferrous salt is ferrous oxalate, ferrous citrate or ferrous sulfide.

Preferably, in the step a, the mass ratio of the fly ash to the acidic solution is 1: 7-1: 12.

Preferably, the pH range of the mixed solution in the step a is 7.1-7.8.

Preferably, the fly ash is formed by incineration of household waste.

Preferably, the steps b to c are repeated at least twice.

The method for cleaning the fly ash comprises the steps of firstly carrying out acid washing, pretreating the fly ash, then carrying out suction filtration to obtain filter residue, then cleaning the filter residue through clear water to obtain the fly ash filter residue after acid treatment, mixing the filter residue with ferrous salt, capturing ions in the fly ash through the ferrous salt, and then cleaning and removing the ions through the clear water, wherein the removal rate of chlorine elements in the fly ash can be up to 99 percent finally.

Detailed Description

A mass ratio of 60: 20, normal temperature, five times of water washing, 1.20g of ferrous sulfate

First water washing: 20.07g of fly ash is mixed with 60ml of water, and 1.20g of ferrous sulfate is added. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: (ii) 26.88g of fly ash was mixed with 60ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: 24.36g of fly ash are mixed with 60ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 23.55g of fly ash were mixed with 60ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, and the filtrate and the filter residue are respectively bottled. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 1a mass ratio 60: 20, normal temperature, four times of water washing, 1.20g of ferrous sulfate

TABLE 1b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	1.50ms	563μs
Second washing with water	9.99ms	576μs	217μs
				Third time of water washing	9.99ms	306μs	184μs
The fourth time of water washing	3.99ms	236μs	175μs

From this, the dechlorination rate was calculated (for example, ferrous sulfide)

Firstly: 20.07 × 11% ═ 2.2g, 2200 mg/kg;

and (3) finally: (9.99+9.99+9.99+3.99) × 1000 × 0.7 × 11% ═ 2230ppm

2230ppm-230ppm＝2000ppm；

1ppm＝1mg/l＝1mg/kg；

(2000÷2200)×100％＝90.9％。

Wherein, 0.7 is the conversion coefficient of the conductivity, 11 percent is the percentage of chlorine in the fly ash, and 230 is the chlorine content of the tap water.

The mass ratio of the two components is 100: 20, normal temperature, five times of water washing:

first water washing:

20.02g of fly ash are mixed with 100ml of water. ② stirring for 15 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 3 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: 22.75g of fly ash and 100ml of water are mixed. ② stirring for 15 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 3 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: 19.91g of fly ash are mixed with 100ml of water. ② stirring for 15 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 3 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 17.68g of fly ash was mixed with 100ml of water. ② stirring for 15 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 3 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: first 16.83g of fly ash are mixed with 100ml of water. ② stirring for 15 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 3 minutes. Thirdly, the mixed liquid is filtered, and the filtrate and the filter residue are respectively bottled. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 2a mass ratio 100: 20, normal temperature, five times of water washing

TABLE 2b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	8.85ms	1.20ms
Second washing with water	9.99ms	1.93ms	395μs
				Third time of water washing	9.38ms	720μs	257μs
The fourth time of water washing	8.17ms	655μs	243μs
				Fifth washing with water	7.96ms	590μs	237μs

Three mass ratios of 140: 60, normal temperature and five times of water washing

First water washing: 60.04g of fly ash are mixed with 140ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: (ii) 87.15g of fly ash are mixed with 140ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: 60.74g of fly ash was mixed with 140ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 72.04g of fly ash are mixed with 140ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: 66.99g of fly ash are mixed with 140ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, and the filtrate and the filter residue are respectively bottled. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 3a mass ratio 140: 60, normal temperature and five times of water washing

TABLE 3b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	9.99ms
Second washing with water	9.99ms	9.99ms	2.09ms
				Third time of water washing	9.99ms	5.28ms	745μs
The fourth time of water washing	9.99ms	1.65ms	332μs
				Fifth washing with water	8.54ms	922μs	243μs

The mass ratio of the four components is 160: 40, washing with water at normal temperature for five times

First water washing: first, 40.03g of fly ash was mixed with 160ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: 48.85g of fly ash are mixed with 160ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: 42.47g of fly ash are mixed with 160ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 49.50g of fly ash are mixed with 160ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: 46.90g of fly ash are mixed with 160ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, and the filtrate and the filter residue are respectively bottled. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 4a mass ratio 160: 40, washing with water at normal temperature for five times

TABLE 4b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	9.99ms	2.31ms
Second washing with water	9.99ms	3.73ms	393μs
				Third time of water washing	9.99ms	1.59ms	475μs
The fourth time of water washing	9.99ms	1.18ms	409μs
				Fifth washing with water	7.66ms	650μs	249μs

And the mass ratio of five is 180: 20, 50 ℃ and seven times of water washing (2)

First water washing: 20.12g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: 26.63g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: 18.97g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring.

Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously.

And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing:

14.50g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: first 16.25g of fly ash is mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And sixth water washing: first 16.30g of fly ash is mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And seventh water washing: 15.54g of fly ash and 180ml of water are mixed, stirred for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and the conductivity value and the pH value are measured after stirring is finished. Thirdly, the mixed liquid is filtered, and the filtrate and the filter residue are respectively bottled. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 5a mass ratio 180: 20, 50 ℃ and seven times of water washing (2)

TABLE 5b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	5.04ms	747μs
Second washing with water	9.99ms	980μs	273μs
				Third time of water washing	6.69ms	542μs	218μs
The fourth time of water washing	6.74ms	438μs	213μs
				Fifth washing with water	6.18ms	326μs	199μs
The sixth washing with water	5.85ms	348μs	200μs
				The seventh time of water washing	5.49ms	382μs	200μs

The six mass ratios are 180: washing with water at 20, 50 deg.C for seven times, and microwave treating

First water washing: first 16.10g of fly ash was mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: 10.82g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: 18.20g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 17.23g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: first 16.85g of fly ash is mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And sixth water washing: 18.20g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And seventh water washing: 15.48g of fly ash are mixed with 180ml of water.

② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring.

Thirdly, the mixed liquid is filtered, and the filtrate and the filter residue are respectively bottled.

And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 6a mass ratio 180: washing with water at 20, 50 deg.C for seven times, and microwave treating

TABLE 6b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	5.07ms	778μs
Second washing with water	9.04ms	864μs	257μs
				Third time of water washing	6.30ms	513μs	216μs
The fourth time of water washing	6.27ms	401μs	235μs
				Fifth washing with water	5.95ms	439μs	218μs
The sixth washing with water	4.64ms	295μs	217μs
				The seventh time of water washing	4.46ms	272μs	207μs

The mass ratio of the seven components is 180: washing with water at 20, 50 deg.C for seven times

First water washing: 20.06g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value every 15 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

And (3) second water washing: 20.20g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value every 15 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

And (3) washing for the third time: 19.81g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value every 15 minutes. Thirdly, the mixed solution is filtered, the filtrate is bottled, the filter residue is continuously washed with water, fourthly, the stock solution is diluted by 10 times and 100 times, and finally, the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times are measured.

Fourth water washing: 17.47g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value every 15 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

Fifth water washing: first 16.90g of fly ash is mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value every 15 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity of the stock solution, the diluted stock solution and the diluted pH10 times and 100 times.

And sixth water washing: 15.29g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value every 15 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

And seventh water washing: 14.15g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value every 15 minutes. Thirdly, the mixed liquid is filtered, and filter residue and filtrate are respectively bottled. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

Table 7a mass ratio 180: washing with water at 20, 50 deg.C for seven times

TABLE 7b

	Stock solution DD	Diluting by 10 times	By a factor of 10	Diluting by 100 times
					First washing with water	9.99ms	1.49ms		785μs
Second washing with water	9.99ms	1.10ms		270μs
					Third time of water washing	7.86ms	607μs		227μs
The fourth time of water washing	7.83ms	606μs		226μs
					Fifth washing with water	7.76ms	620μs		211μs
The sixth washing with water	6.83ms	459μs		222μs
					The seventh time of water washing	5.83ms	425μs		221μs

Eight mass ratios of 180: washing with EDTA chitosan at 20, 50 deg.C for five times

First water washing: 20.03g of fly ash are mixed with 180ml of water. 3.18g of EDTA chitosan was added. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing:

24.16g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time:

22.21g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 21.53g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: 20.64g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, and the filtrate and the filter residue are respectively bottled. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 8a mass ratio 180: washing with EDTA chitosan at 20, 50 deg.C for five times

TABLE 8b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	4.61ms	715μs
Second washing with water	8.35ms	900μs	252μs
				Third time of water washing	6.09ms	552μs	203μs
The fourth time of water washing	5.30ms	427μs	196μs
				Fifth washing with water	5.29ms	445μs	185μs

Nine mass ratios are 180: washing at 20, 50 deg.C for five times with water, pH 7.5

First water washing: 20.08g of fly ash are mixed with 180ml of water. The pH was adjusted to 7.5 by adding 9ml of glacial acetic acid solution. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: 9.51g of fly ash are mixed with 180ml of water. The pH was adjusted to 7.5 by adding 0.5ml of glacial acetic acid solution. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: 7.44g of fly ash are mixed with 180ml of water. The pH was adjusted to 7.5 by adding 0.5ml of glacial acetic acid solution. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 8.68g of fly ash are mixed with 180ml of water. The pH was adjusted to 7.5 by adding 0.5ml of glacial acetic acid solution. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: 5.69g of fly ash was mixed with 180ml of water. Adding glacial acetic acid solution 0.5ml to adjust pH

7.5. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, and the filtrate and the filter residue are respectively bottled. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 9a mass ratio 180: washing at 20, 50 deg.C for five times with water, pH 7.5

TABLE 9b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	8.42ms	1.38ms
Second washing with water	6.28ms	1.03ms	313μs
				Third time of water washing	2.41ms	504μs	241μs
The fourth time of water washing	3.71ms	679μs	261μs
				Fifth washing with water	2.04ms	603μs	240μs

The mass ratio of ten is 180: washing at 20, 50 deg.C for five times with water, pH 7.7

First water washing: 20.07g of fly ash was mixed with 180ml of water. 10ml of 50% hydrochloric acid solution and 10ml of 80% hydrochloric acid solution were added to adjust the pH to 7.7. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: 48.85g of fly ash are mixed with 180ml of water. 2.8ml of 80% hydrochloric acid solution was added to adjust the pH to 7.7. Secondly, stirring for 60 minutes at the normal temperature at the rotating speed of 433r/s, and measuring the conductivity value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the electric conductivity of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: 42.47g of fly ash are mixed with 180ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 49.50g of fly ash are mixed with 180ml of water. Adding 1.5ml of 80% hydrochloric acid solution to adjust the pH value to 7.7, stirring at the rotating speed of 433r/s for 60 minutes at normal temperature, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: 46.90g of fly ash are mixed with 180ml of water. 1.0ml of 80% hydrochloric acid solution was added to adjust the pH to 7.7. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, and the filtrate and the filter residue are respectively bottled. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 10a mass ratio 180: washing at 20, 50 deg.C for five times with water, pH 7.7

TABLE 10b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99s	9.99ms	1.51ms
Second washing with water	9.99ms	2.30ms	530μs
				Third time of water washing	2.01ms	434μs	241μs
The fourth time of water washing	1.22ms	335μs	230μs
				Fifth washing with water	809μs	226μs	281μs

Eleven mass ratios of 180: five times of water washing at 20 and 50 ℃, sodium dodecyl benzene sulfonate and betaine

First water washing: 20.14g of fly ash are mixed with 180ml of water. 3.02g of sodium dodecyl benzene sulfonate and 2.98g of betaine are added. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: 27.43g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: 30.34g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 25.59g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: 28.12g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 50 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, and the filtrate and the filter residue are respectively bottled. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 11a mass ratio 180: five times of water washing at 20 and 50 ℃, sodium dodecyl benzene sulfonate and betaine

TABLE 11b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	4.81ms	754μs
Second washing with water	9.99ms	1.03ms	227μs
				Third time of water washing	6.24ms	585μs	218μs
The fourth time of water washing	5.54ms	407μs	200μs
				Fifth washing with water	5.22ms	403μs	201μs

The mass ratio of twelve is 180: 20, 80 ℃, seven times of water washing (2)

First water washing: 20.27g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 80 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: 20.51g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 80 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: 18.02g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 80 ℃, and measuring the conductivity value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the electric conductivity of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 20.40g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 80 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: first 16.25g of fly ash is mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 80 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And sixth water washing: first 16.07g of fly ash was mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 80 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And seventh water washing:

15.88g of fly ash is mixed with 180ml of water

② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 80 ℃, and measuring the conductivity value and the pH value after stirring.

Thirdly, the mixed liquid is filtered, and the filtrate and the filter residue are respectively bottled.

And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 12a twelve mass ratio 180: 20, 80 ℃, seven times of water washing (2)

TABLE 12b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	4.98ms	710μs
Second washing with water	7.98ms	4.83ms	696μs
				Third time of water washing	5.17ms	384μs	192μs
The fourth time of water washing	4.96ms	335μs	176μs
				Fifth washing with water	4.70ms	296μs	179μs
The sixth washing with water	5.94ms	519μs	189μs
				The seventh time of water washing	4.45ms	256μs	177μs

Thirteen mass ratios are 180: 20, 80 ℃, seven times of water washing (3)

First water washing: 20.27g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 80 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: 19.46g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 80 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: 18.82g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 80 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 17.25g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 80 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: 18.26g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 80 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And sixth water washing: first 16.89g of fly ash was mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 80 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And seventh water washing:

15.64g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at the rotating speed of 433r/s and the temperature of 80 ℃, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, and the filtrate and the filter residue are respectively bottled.

And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 13a mass ratio 180: 20, 80 ℃, seven times of water washing (3)

TABLE 13b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	7.12ms	936μs
Second washing with water	9.99ms	954μs	318μs
				Third time of water washing	7.47ms	429μs	240μs
The fourth time of water washing	4.47ms	378μs	253μs
				Fifth washing with water	6.46ms	477μs	241μs
The sixth washing with water	7.61ms	408μs	236μs
				The seventh time of water washing	7.68ms	494μs	360μs

Fourteen mass ratios are 180: 20, normal temperature, five times of water washing, 2.99g of ferrous oxalate

First water washing: 20.07g of fly ash, 180.68g of water and 2.99g of ferrous oxalate are mixed. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: (ii) mixing 30.07g of the first washing residue with 181.2g of water. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: (i) mixing 31.11g of the second water-washing residue with 180.6g of water. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 26.28g of third washing residue and 181.5g of water were mixed. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: 24.40g of the fourth washing residue and 180.5g of water were mixed. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 14a mass ratio 180: 20, normal temperature, five times of water washing, 2.99g of ferrous oxalate

TABLE 14b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	3.15ms	727μs
Second washing with water	7.03ms	788μs	359μs
				Third time of water washing	4.86ms	480μs	370μs
The fourth time of water washing	3.62ms	370μs	297μs
				Fifth washing with water	3.05ms	387μs	287μs

Fifteen mass ratio is 180: 20, normal temperature, four times of water washing, 3.10g of chitosan containing molecular sieve

First water washing: 20.08g of fly ash are mixed with 180ml of water. 3.10g of chitosan containing a molecular sieve was added. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring.

Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: 27.03g of fly ash was mixed with 180ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: firstly, 26.85g of fly ash is mixed with 180ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: firstly, 26.85g of fly ash is mixed with 180ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, and the filtrate and the filter residue are respectively bottled. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 15a mass ratio 180: 20, normal temperature, four times of water washing, 3.10g of chitosan containing molecular sieve

TABLE 15b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	5.00ms	700μs
Second washing with water	8.89ms	875μs	279μs
				Third time of water washing	6.56ms	556μs	208μs
The fourth time of water washing	7.96ms	423μs	199μs

Sixteen mass ratios are 180: 20, washing with EDTA chitosan at normal temperature for five times

First water washing: 20.07g of fly ash was mixed with 180ml of water. 2.95g of EDTA chitosan was added. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: firstly, 26.88g of fly ash is mixed with 180ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: 24.36g of fly ash are mixed with 180ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 23.55g of fly ash are mixed with 180ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: 20.64g of fly ash are mixed with 180ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, and the filtrate and the filter residue are respectively bottled. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 16a mass ratio 180: 20, washing with EDTA chitosan at normal temperature for five times

TABLE 16b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	4.48ms	717μs
Second washing with water	8.83ms	916μs	244μs
				Third time of water washing	6.58ms	624μs	202μs
The fourth time of water washing	5.95ms	528μs	186μs
				Fifth washing with water	5.46ms	423μs	190μs

Seventeen mass ratio is 180: 20, normal temperature, five times of water washing, 3.655g of ferrous sulfide

First water washing: 20.00g of fly ash was mixed with 180.7g of water and 3.655g of ferrous sulfide. Secondly, stirring for 1 hour at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value once after stirring for 30 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: (ii) 28.56g of the first washing residue and 180.41g of water were mixed. Secondly, stirring for 1 hour at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value once after stirring for 30 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: (ii) mixing 26.12g of the second water-washing residue with 180.47g of water. Secondly, stirring for 1 hour at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value once after stirring for 30 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: (ii) mixing 24.18g of the third washing residue with 182.15g of water. Secondly, stirring for 1 hour at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value once after stirring for 30 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: 23.19g of fourth water washing residue and 182.10g of water are mixed. Secondly, stirring for 1 hour at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value once after stirring for 30 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 17a mass ratio 180: 20, normal temperature, five times of water washing, 3.655g of ferrous sulfide

TABLE 17b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	3.53ms	563μs
Second washing with water	6.85ms	707μs	217μs
				Third time of water washing	5.00ms	418μs	184μs
The fourth time of water washing	4.40ms	378μs	175μs
				Fifth washing with water	3.72ms	289μs	171μs

Eighteen, the mass ratio is 180: 20, normal temperature, five times of water washing, 3.60g of ferrous sulfate.

First water washing: 20.05g of fly ash are mixed with 180ml of water. 3.60g of ferrous sulfate was added. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: 36.70g of fly ash are mixed with 180ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: 39.76g of fly ash was mixed with 180ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 39.23g of fly ash are mixed with 180ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, and the filtrate and the filter residue are respectively bottled. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: 38.96g of fly ash are mixed with 180ml of water. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, and the filtrate and the filter residue are respectively bottled.

And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 18a mass ratio 180: 20, normal temperature, five times of water washing, 3.60g of ferrous sulfate

TABLE 18b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	4.30ms	703μs
Second washing with water	9.02ms	912μs	303μs
				Third time of water washing	5.22ms	483μs	240μs
The fourth time of water washing	3.99ms	43176μs	232μs
				Fifth washing with water	2.94ms	184μs	236μs

The nineteen mass ratios are 180: 20, normal temperature, five times of water washing, 3.04g of copper acetate

First water washing: 20.01g of fly ash was mixed with 183.8g of water and 3.06g of manganese chloride. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: (i) first washing residue 21.13g and 181.3g of water were mixed. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: (ii) 23.24g of the second water-washing residue was mixed with 180.6g of water. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value once after stirring for 15 min. ③ mixing

Filtering the solution, bottling the filtrate, and washing the filter residue with water. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: (i) mixing 21.80g of the third water-washing residue with 181.7g of water. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: 22.24g of the fourth washing residue and 181.96g of water were mixed. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 19a mass ratio 180: 20, normal temperature, five times of water washing, 3.04g of copper acetate

TABLE 19b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	5.35ms	901μs
Second washing with water	7.53ms	993μs	428μs
				Third time of water washing	4.92ms	514μs	421μs
The fourth time of water washing	4.66ms	404μs	379μs
				Fifth washing with water	4.18ms	491μs	403μs

Twenty mass ratios of 180: 20, room temperature, seven times of water washing

First water washing: 20.00g of fly ash was mixed with 180ml of water. ② stirring for 60 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 15 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

And (3) second water washing: 21.28g of fly ash is mixed with 180ml of water. ② stirring for 60 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 15 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

And (3) washing for the third time: 18.96g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 15 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

Fourth water washing: 22.95g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 15 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

Fifth water washing: 15.95g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 15 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

And sixth water washing: 14.86g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 15 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

And seventh water washing: 13.87g of fly ash are mixed with 180ml of water. ② stirring for 60 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 15 minutes. Thirdly, the mixed solution is filtered, filter residue and filtrate are respectively bottled, fourthly, the stock solution is diluted by 10 times and 100 times, and finally, the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times are measured.

Table 20a mass ratio 180: 20, room temperature, seven times of water washing

TABLE 20b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	1.49ms	785μs
Second washing with water	9.99ms	1.10ms	270μs
				Third time of water washing	7.86ms	607μs	227μs
The fourth time of water washing	7.83ms	606μs	226μs
				Fifth washing with water	7.76ms	620μs	211μs
The sixth washing with water	6.83ms	459μs	222μs
				The seventh time of water washing	5.83ms	425μs	221μs

Twenty-one mass ratio 180: 20, room temperature, three times water washing (2)

First water washing: 20.30g of fly ash are mixed with 180ml of water. ② stirring for 15 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 3 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

And (3) second water washing: 20.89g of fly ash was mixed with 180ml of water. ② stirring for 15 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 3 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

And (3) washing for the third time: first 16.30g of fly ash is mixed with 180ml of water. ② stirring for 15 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 3 minutes. Thirdly, the mixed liquid is filtered, and filter residue and filtrate are respectively bottled. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

Table 21a mass ratio 180: 20, room temperature, three times water washing (2)

TABLE 21b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	6.02ms	872μs
Second washing with water	9.99ms	1.21ms	296μs
				Third time of water washing	8.28ms	806μs	239μs

Twenty-two mass ratio 180: 20, room temperature, five water washes

First water washing: 20.04g of fly ash are mixed with 180ml of water. ② stirring for 15 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 3 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

And (3) second water washing: 20.62g of fly ash are mixed with 180ml of water. ② stirring for 15 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 3 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

And (3) washing for the third time: 19.91g of fly ash are mixed with 180ml of water. ② stirring for 15 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 3 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

Fourth water washing: 17.68g of fly ash are mixed with 180ml of water. ② stirring for 15 minutes at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value every 3 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

Fifth water washing: first 16.83g of fly ash are mixed with 180ml of water. ② at room temperature at the rotating speed of 433r/s

The mixture was stirred for 15 minutes, and the conductivity value and pH were measured every 3 minutes. Thirdly, the mixed liquid is filtered, and filter residue and filtrate are respectively bottled. Fourthly, diluting the stock solution by 10 times and 100 times, and finally measuring the conductivity and the pH of the stock solution, the diluted 10 times and the diluted 100 times.

Table 22a mass ratio 180: 20, room temperature, five water washes

The twenty-three mass ratios are 180: washing with water at 20-room temperature for five times, and copper chloride 3.10g

First water washing: 20.00g of fly ash and 180.12g of water were mixed with 3.10g of copper chloride. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: 23.10g of the first washing residue and 179.36g of water were mixed. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: (ii) mixing 24.70g of the second water-washing residue with 181.1g of water. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 20.68g of the third water-washing residue and 180.5g of water were mixed.

② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: 20.64g of the fourth washing residue and 180.14g of water are mixed. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 23a mass ratio 180: washing with water at 20-room temperature for five times, and copper chloride 3.10g

TABLE 23b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	2.74ms	502μs
Second washing with water	3.32ms	404μs	174μs
				Third time of water washing	1.54ms	208μs	150μs
The fourth time of water washing	1.21ms	167μs	143μs
				Fifth washing with water	1.01ms	165μs	140μs

The twenty-four mass ratio is 180: washing with water at 20-room temperature for five times, cuprous chloride 3.00g

First water washing: 20.00g of fly ash was mixed with 180.5g of water and 3.00g of cuprous chloride. Secondly, stirring for 1 hour at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 30 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: (ii) 28.45g of the first washing residue and 181.0g of water were mixed. Secondly, stirring for 1 hour at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 30 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: (ii) 28.80g of the second water-washing residue was mixed with 181.0g of water. Secondly, stirring for 1 hour at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 30 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 22.82g of the third water-washing residue and 187.5g of water were mixed. Secondly, stirring for 1 hour at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 30 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: 24.87g of fourth washing residue and 182.7g of water are mixed. Secondly, stirring for 1 hour at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 30 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 24a mass ratio 180: washing with water at 20-room temperature for five times, cuprous chloride 3.00g

TABLE 24b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	2.83ms	513μs
Second washing with water	5.00ms	607μs	217μs
				Third time of water washing	2.43ms	183μs	176μs
The fourth time of water washing	1.96ms	214μs	163μs
				Fifth washing with water	1.79ms	186μs	160μs

Twenty-five mass ratio is 180: 20-Normal temperature, five times of water washing, 3.03g of ferrous citrate

First water washing: 20.10g of fly ash and 180.32g of water are mixed with 3.03g of ferrous citrate. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: 36.78g of first water washing residue and 180.70g of water were mixed. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: (ii) 29.27g of the second water-washing residue was mixed with 181.0g of water. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 25.31g of the third washing residue and 180.3g of water were mixed. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: 23.78g of the fourth washing residue and 180.8g of water were mixed. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 25a mass ratio 180: 20-Normal temperature, five times of water washing, 3.03g of ferrous citrate

TABLE 25b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	3.94ms	714μs
Second washing with water	6.25ms	958μs	357μs
				Third time of water washing	2.36ms	440μs	301μs
The fourth time of water washing	1.85ms	352μs	284μs
				Fifth washing with water	2.14ms	347μs	282μs

Twenty-six mass ratios of 180: washing with water for five times at 20-normal temperature, and 3.434g of sodium phosphate

First water washing: 20.11g of fly ash and 180.4g of water were mixed with 3.434g of sodium phosphate. Secondly, stirring for 1 hour at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 30 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: first washing residue 34.20g and 182.9g were mixed together. Secondly, stirring for 1 hour at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 30 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: 31.52g of the second water-washing residue and 180.9g of water were mixed. Secondly, stirring for 1 hour at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 30 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 28.56g of the third water-washing residue was mixed with 181.21g of water. Secondly, stirring for 1 hour at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 30 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: 27.61g of the fourth water-washing residue and 180.51g of water were mixed. Secondly, stirring for 1 hour at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 30 minutes. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 26a mass ratio 180: washing with water for five times at 20-normal temperature, and 3.434g of sodium phosphate

TABLE 26b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	2.68ms	502μs
Second washing with water	6.48ms	664μs	218μs
				Third time of water washing	4.19ms	408μs	173μs
The fourth time of water washing	3.46ms	277μs	169μs
				Fifth washing with water	2.93ms	229μs	163μs

Twenty-seven mass ratio 180: 20-normal temperature, five times of water washing, 3.061g of manganese chloride

First water washing: 21.06g of fly ash was mixed with 180.68g of water and 3.04g of copper acetate. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously.

And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: 32.23g of the first washing residue and 180.60g of water were mixed. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) washing for the third time: 29.94g of the second water-washing residue and 180.75g of water were mixed. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fourth water washing: 27.94g of the third washing residue and 180.6g of water were mixed. ② stirring for 30min at room temperature at the rotating speed of 433r/s, and measuring the conductivity value and the PH value once after stirring for 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Fifth water washing: 25.52g of fourth water washing residue and 186.9g of water are mixed. ② at the rotating speed of

433r/s, stirring at room temperature for 30min, and measuring the conductivity value and the pH value once after stirring to 15 min. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the PH value of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

Table 27a mass ratio 180: 20-normal temperature, five times of water washing, 3.061g of manganese chloride

TABLE 27b

	Stock solution DD	Diluting by 10 times	Diluting by 100 times
				First washing with water	9.99ms	4.65ms	891μs
Second washing with water	7.76ms	915μs	373μs
				Third time of water washing	4.00ms	505μs	374μs
The fourth time of water washing	2.86ms	357μs	333μs
				Fifth washing with water	2.56ms	342μs	303μs

Aiming at the experimental tests, the dechlorination rate is comprehensively calculated, and the conditions corresponding to each experiment and the final dechlorination rate are as follows:

watch 28

As is clear from Table 28, the dechlorination rates of experiment 1, experiment 14, experiment 15, experiment 17, experiment 18 and experiment 19 were all high. The best dechlorination effect is ferrous sulfate and copper acetate, which reach 98%, and experiments 1, 14, 17 and 18 show that the contribution of ferrous ions to dechlorination is obviously higher.

In addition, it can be seen from the table that experiments 9 and 10 (compared to experiments 5 to 7) show an increase of about 20% in dechlorination rate after addition of hydrochloric acid and acetic acid.

Therefore, when the fly ash is dechlorinated and cleaned, the fly ash can be firstly pickled and then cleaned by adding ferrous ions, and therefore, the experimental verification is as follows: a. mixing fly ash and hydrochloric acid solution, and stirring at constant temperature to obtain a mixed solution; b. performing suction filtration, and keeping filter residue; c. Washing the filter residue with water;

d. mixing the cleaned filter residue with a ferrous salt solution, and stirring at constant temperature; e. performing suction filtration, and keeping filter residue; f. mixing the filter residue with water; g. Stirring and filtering to obtain filter residue; h. repeating the steps f to g1 times to 3 times. The specific operation is as follows: first water washing: 20.00g fly ash was mixed with 180ml water. The pH of the hydrochloric acid solution is adjusted to 7.2. Secondly, stirring for 60 minutes at normal temperature at the rotating speed of 433r/s, and measuring the conductivity value and the pH value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the conductivity and the pH of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times.

And (3) second water washing: the filter residue is mixed with 180ml of water for cleaning. Secondly, stirring for 60 minutes at the normal temperature at the rotating speed of 433r/s, and measuring the conductivity value after stirring. Thirdly, the mixed liquid is filtered, the filtrate is bottled, and the filter residue is washed by water continuously. And fourthly, diluting the filtrate by 10 times and 100 times, and finally measuring the electric conductivity of the filtrate, the liquid diluted by 10 times and the liquid diluted by 100 times. And (3) washing for the third time: the filter residue was mixed with 180ml of water, and 3.6g of ferrous sulfate was added. The rotation speed is 433r/s, stirring is carried out for 60 minutes at normal temperature, and the conductivity value and the pH value are measured after stirring is finished. Filtering the mixed solution, bottling the filtrate, and washing the filter residue with water. The filtrate was diluted 10-fold and 100-fold, and finally the conductivity and pH of the filtrate, the liquid after 10-fold and 100-fold dilution were measured. Fourth water washing: the filter residue was mixed with 180ml of water. Stirring at 433r/s at normal temperature for 60 min, and measuring conductivity and pH. And carrying out suction filtration on the mixed solution, bottling the filtrate, and continuously washing the filter residue with water. The filtrate was diluted 10-fold and 100-fold, and finally the conductivity and pH of the filtrate, the liquid after 10-fold and 100-fold dilution were measured. Fifth water washing: the filter residue was mixed with 180ml of water. Stirring at 433r/s at normal temperature for 60 min, and measuring conductivity and pH. Filtering the mixture, and bottling the filtrate and the residue respectively. The filtrate was diluted 10-fold and 100-fold, and finally the conductivity and pH of the filtrate, the liquid after 10-fold and 100-fold dilution were measured. The dechlorination rate of the 5 times of cleaning is calculated to reach 98.8 percent; after the second washing is repeated for 2 times, the third washing is carried out again to obtain the dechlorination rate of 99.2 percent; after repeating the fifth washing for 3 times, the dechlorination rate was 99.8%.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structures made by the present disclosure or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.