阅读说明：本技术 适用于硫酸钙晶须生产的废水零排放处理工艺及处理装置 (Wastewater zero-discharge treatment process and device suitable for calcium sulfate whisker production ) 是由 徐卫华 龚琦 宫维 廉颖 李均喜 陶欣 陈明 蔡旭 于 2020-07-16 设计创作，主要内容包括：本发明公开了一种适用于硫酸钙晶须生产的废水零排放处理工艺,包括以下步骤：1)使用原料芒硝尾矿卤水以及碱厂副产氯化钙进行硫酸钙晶须生产,生产后的废水送入混合水桶内,得到混合液；2)将混合水桶内的混合液送入折流槽内与碱水混合后送入反应澄清水桶,经反应澄清水桶分离出泥渣和澄清液；3)将泥渣送入干燥装置干燥,得到碳酸钙；4)将澄清液送入除钙卤水桶,通过在除钙卤水桶内进行氯化钠浓度采样,若浓度达到设定值则将澄清液送入卤水桶并经卤水桶外销；若浓度未达设定值,则将其送入化盐池并加入氯化钠,使其浓度达到设定值后送入卤水桶并并经卤水桶外销,本发明实现了制备硫酸钙晶须产品生产工艺中废水的综合利用零排放。(The invention discloses a wastewater zero-discharge treatment process suitable for calcium sulfate whisker production, which comprises the following steps of: 1) using raw material mirabilite tailing brine and calcium chloride byproduct of an alkali factory to produce calcium sulfate whiskers, and feeding the produced wastewater into a mixing bucket to obtain mixed liquor; 2) sending the mixed liquid in the mixed water barrel into a baffling tank to be mixed with alkaline water, sending the mixed liquid into a reaction clarifying water barrel, and separating sludge and clarifying liquid through the reaction clarifying water barrel; 3) the sludge is sent into a drying device for drying to obtain calcium carbonate; 4) sending the clear liquid into a calcium-removing brine barrel, sampling the concentration of sodium chloride in the calcium-removing brine barrel, and sending the clear liquid into the brine barrel and selling the clear liquid outside the brine barrel if the concentration reaches a set value; if the concentration does not reach the set value, the calcium sulfate whisker is sent into a salt dissolving pool and added with sodium chloride, and the calcium sulfate whisker is sent into a brine barrel and sold outside the brine barrel after the concentration reaches the set value.)

1. A wastewater zero-discharge treatment process suitable for calcium sulfate whisker production is characterized by comprising the following steps:

step 1) carrying out calcium sulfate whisker production by using raw material mirabilite tailing brine and calcium chloride byproduct of an alkali factory, and feeding produced wastewater into a mixed water barrel to obtain mixed solution;

step 2) sending the mixed liquid in the mixed water barrel into a baffling tank to be mixed with alkaline water, sending the mixed liquid into a reaction clarifying water barrel, and separating sludge and clarifying liquid through the reaction clarifying water barrel;

step 3), conveying the sludge into a drying device for drying to obtain calcium carbonate;

step 4), sending the clear liquid into a calcium-removing brine barrel, sampling the concentration of sodium chloride in the calcium-removing brine barrel, and sending the clear liquid into the brine barrel and selling the clear liquid outside the brine barrel if the concentration reaches a set value; if the concentration does not reach the set value, the brine is sent into a salt dissolving pool, sodium chloride is added, the concentration reaches the set value, then the brine is sent into a brine bucket and is sold outside the brine bucket.

2. The process of claim 1, wherein the parameters of the glauber's salt tailing brine in the step 1) for the production of calcium sulfate whiskers are as follows: the concentration of sodium chloride is controlled to be 250000ppm-290000ppm, and the concentration of sodium sulfate is controlled to be 60000ppm-90000 ppm; the adding molar ratio of the sodium sulfate in the mirabilite tailing brine to the byproduct calcium chloride in the alkali factory is 1.05:1-1.20: 1.

3. The process for zero-emission treatment of wastewater suitable for calcium sulfate whisker production according to claim 1 or 2, wherein the sludge in the step 3) is sent to a drying device for drying to obtain calcium carbonate; the method specifically comprises the following steps: and (3) conveying the sludge into a roller scraper dryer through a calcium sludge barrel, drying to obtain calcium carbonate, and conveying filtrate generated in the drying process into a calcium-removing brine barrel through a filtrate barrel.

4. A wastewater zero-emission treatment device suitable for calcium sulfate whisker production is characterized by being used for realizing the treatment process of any one of claims 1 to 3 and comprising a mixing water bucket, a soda ash preparation bucket, a baffling groove, a reaction clarified water bucket, a calcium mud bucket, a roller scraper dryer, a filtrate bucket, a calcium removal brine bucket, a salt dissolving pool and a brine bucket;

the inlet of the mixing water bucket is used for receiving waste water generated after the raw material mirabilite tailing brine and the byproduct calcium chloride of the alkali plant are used for producing the calcium sulfate whisker, and the outlet of the mixing water bucket is connected with one inlet of the baffling groove;

the soda configuration barrel is used for configuring soda water, and an outlet of the soda configuration barrel is connected with the other inlet of the diversion groove;

the baffling tank is used for mixing the wastewater with alkaline water to obtain a mixed solution, and an outlet of the baffling tank is connected with a reaction clarifying bucket;

the reaction clarifying bucket is used for separating mud residue and clarifying solution from the mixed solution, a mud residue outlet of the reaction clarifying bucket is connected with the calcium mud bucket, and a clarifying solution outlet of the reaction clarifying bucket is connected with the calcium removing brine bucket;

the calcium mud barrel is used for stirring mud residues, and an outlet of the calcium mud barrel is connected with the roller scraper dryer;

the roller scraper dryer is used for realizing solid-liquid separation of sludge to obtain calcium carbonate, and meanwhile, a liquid discharge port of the roller scraper dryer is connected with a filtrate barrel;

the filtrate barrel is used for sending filtrate into a calcium-removing brine barrel, and an outlet of the filtrate barrel is connected with the calcium-removing brine barrel;

the calcium-removing brine barrel is used for temporarily storing clear liquid and filtrate, meanwhile, concentration sampling is carried out in the calcium-removing brine barrel, the outlet of the calcium-removing brine barrel is divided into two paths, one path is connected with the salt dissolving tank, and the other path is connected with the brine barrel;

the salt dissolving tank is used for adjusting the concentration of sodium chloride, and an outlet of the salt dissolving tank is connected with the brine barrel;

the brine barrel is used for discharging brine.

Technical Field

The invention relates to a wastewater treatment process, in particular to a wastewater zero-discharge treatment process suitable for calcium sulfate whisker production.

Background

The calcium sulfate whisker product is prepared by taking mirabilite tailings and calcium chloride byproduct of alkali factory as raw materials. In the whole process, the components of the wastewater are more complex: firstly, the reaction mother liquor obtained in the synthesis reaction process is sodium chloride solution, the ions of other components are sulfate ions and calcium magnesium ions, and the concentration of calcium sulfate is saturated at the synthesis temperature. Secondly, the washing water obtained by washing the product has the concentration lower than that of the mother liquor generated in the reaction process.

At present, the production process without wastewater zero discharge in the production process has the following problems:

if the mother liquor by-produced in the synthesis reaction is used as mine brine (sodium chloride type), the concentration of sodium chloride reaches the standard, but the concentration of calcium ions is too high;

in the process, mixed water of reaction mother liquor and material suction filtration washing water is used as industrial wastewater, and the treatment difficulty and the treatment cost are high due to high salt content;

if the mixed water of the reaction mother liquor and the material cleaning water is used as mine brine (sodium chloride type), the concentration of sodium chloride is low, and the concentration of calcium ions is still too high;

the concentration of reaction mother liquor and material cleaning water is too high, and the pipeline transportation is easy to crystallize to cause pipe blockage.

Disclosure of Invention

The invention aims to provide a wastewater zero-discharge treatment process and a treatment device thereof, which are suitable for calcium sulfate whisker production, and realize comprehensive utilization and zero discharge of wastewater in the production process for preparing calcium sulfate whisker products.

The purpose of the invention is realized as follows: a wastewater zero-discharge treatment process suitable for calcium sulfate whisker production comprises the following steps:

step 1) carrying out calcium sulfate whisker production by using raw material mirabilite tailing brine and calcium chloride byproduct of an alkali factory, and feeding produced wastewater into a mixed water barrel to obtain mixed solution;

step 2) sending the mixed liquid in the mixed water barrel into a baffling tank to be mixed with alkaline water, sending the mixed liquid into a reaction clarifying water barrel, and separating sludge and clarifying liquid through the reaction clarifying water barrel;

step 3), conveying the sludge into a drying device for drying to obtain calcium carbonate;

step 4), sending the clear liquid into a calcium-removing brine barrel, sampling the concentration of sodium chloride in the calcium-removing brine barrel, and sending the clear liquid into the brine barrel and selling the clear liquid outside the brine barrel if the concentration reaches a set value; if the concentration does not reach the set value, the brine is sent into a salt dissolving pool, sodium chloride is added, the concentration reaches the set value, then the brine is sent into a brine bucket and is sold outside the brine bucket.

A wastewater zero-emission treatment device suitable for calcium sulfate whisker production is characterized by being used for realizing the treatment process and comprising a mixed water bucket, a soda ash preparation bucket, a diversion groove, a reaction clarification water bucket, a calcium sludge bucket, a roller scraper dryer, a filtrate bucket, a calcium removal brine bucket, a salt dissolving pool and a brine bucket;

the inlet of the mixing water bucket is used for receiving waste water generated after the raw material mirabilite tailing brine and the byproduct calcium chloride of the alkali plant are used for producing the calcium sulfate whisker, and the outlet of the mixing water bucket is connected with one inlet of the baffling groove;

the soda configuration barrel is used for configuring soda water, and an outlet of the soda configuration barrel is connected with the other inlet of the diversion groove;

the baffling tank is used for mixing the wastewater with alkaline water to obtain a mixed solution, and an outlet of the baffling tank is connected with a reaction clarifying bucket;

the reaction clarifying bucket is used for separating mud residue and clarifying solution from the mixed solution, a mud residue outlet of the reaction clarifying bucket is connected with the calcium mud bucket, and a clarifying solution outlet of the reaction clarifying bucket is connected with the calcium removing brine bucket;

the calcium mud barrel is used for stirring mud residues, and an outlet of the calcium mud barrel is connected with the roller scraper dryer;

the roller scraper dryer is used for realizing solid-liquid separation of sludge to obtain calcium carbonate, and meanwhile, a liquid discharge port of the roller scraper dryer is connected with a filtrate barrel;

the filtrate barrel is used for sending filtrate into a calcium-removing brine barrel, and an outlet of the filtrate barrel is connected with the calcium-removing brine barrel;

the calcium-removing brine barrel is used for temporarily storing clear liquid and filtrate, meanwhile, concentration sampling is carried out in the calcium-removing brine barrel, the outlet of the calcium-removing brine barrel is divided into two paths, one path is connected with the salt dissolving tank, and the other path is connected with the brine barrel;

the salt dissolving tank is used for adjusting the concentration of sodium chloride, and an outlet of the salt dissolving tank is connected with the brine barrel;

the brine barrel is used for discharging brine.

As a further limitation of the present invention, in the step 1), during the production of calcium sulfate whisker, the parameters of the mirabilite tailing brine are specifically as follows: the concentration of sodium chloride is controlled to be 250000ppm-290000ppm, and the concentration of sodium sulfate is controlled to be 60000ppm-90000 ppm; the adding molar ratio of the sodium sulfate in the mirabilite tailing brine to the byproduct calcium chloride in the alkali factory is 1.05:1-1.20: 1. Under the condition of the concentration and the adding molar ratio, the synthesis of the calcium sulfate whisker and the concentration of the sodium chloride in the mother liquor after the reaction are close to the concentration of the final export brine are considered, so that the comprehensive utilization is realized.

As a further limitation of the invention, the sludge in the step 3) is sent into a drying device for drying to obtain calcium carbonate; the method specifically comprises the following steps: and (3) conveying the sludge into a roller scraper dryer through a calcium sludge barrel, drying to obtain calcium carbonate, and conveying filtrate generated in the drying process into a calcium-removing brine barrel through a filtrate barrel.

Compared with the prior art, the invention has the beneficial effects that: the method adopts mirabilite tailings and calcium chloride byproduct of an alkali plant as raw materials, controls the concentration and the adding proportion of the raw material mirabilite tailing brine and the calcium chloride byproduct of the alkali plant, reacts according to the concentration, mixes the obtained mother liquor with washing water obtained by pumping and washing the product, and finally obtains a mine brine (sodium chloride type) product and a calcium carbonate byproduct product by combining a mixing treatment system, thereby realizing the environmental protection and zero emission of the whole process and high utilization rate of the raw materials.

Drawings

FIG. 1 is a schematic diagram of a processing apparatus of the present invention.

Wherein, 1 mixed bucket, 2 mixed water pump, 3 baffling groove, 4 reaction clarifying bucket, 5 clarifying water pump, 6 dredge pump, 7 calcium mud bucket, 8 calcium mud pump, 9 cylinder scraper dryer, 10 filtrate bucket, 11 filtrate pump, 12 calcium removing brine bucket, 13 calcium removing brine pump, 14 brine bucket, 15 soda preparation bucket, 16 salt dissolving pool.

Detailed Description

As shown in fig. 1, the wastewater zero-discharge treatment device suitable for calcium sulfate whisker production comprises a mixing water barrel 1, a soda preparation barrel 15, a baffle 3, a reaction clarification water barrel 4, a calcium mud barrel 7, a roller scraper dryer 9, a filtrate barrel 10, a calcium removal brine barrel 12, a salt dissolving tank 16 and a brine barrel 14;

the inlet of the mixing water barrel 1 is used for receiving waste water generated after the raw material mirabilite tailing brine and the byproduct calcium chloride of the alkali plant are used for producing calcium sulfate whisker, and the outlet of the mixing water barrel 1 is connected with one inlet of the baffling groove 3 through the mixing water pump 2;

the soda configuration barrel 15 is used for configuring soda water, and an outlet of the soda configuration barrel 15 is connected with the other inlet of the diversion groove 3;

the baffling tank 3 is used for mixing the wastewater with alkaline water to obtain a mixed solution, and the outlet of the baffling tank 3 is connected with two reaction clarifying buckets 4;

the reaction clarifying water barrel 4 is used for separating mud residue and clarifying solution from the mixed solution, the mud residue outlet of the reaction clarifying water barrel 4 is connected with a calcium mud barrel 7 through a mud pump 6, and the clarifying solution outlet of the reaction clarifying water barrel 4 is connected with a calcium removing brine barrel 12 through a clarifying water pump 5;

the calcium mud barrel 7 is used for stirring mud residues, and the outlet of the calcium mud barrel 7 is connected with the roller scraper dryer 9 through a calcium mud pump 8;

the roller scraper dryer 9 is used for realizing solid-liquid separation of sludge to obtain calcium carbonate, and meanwhile, a liquid discharge port of the roller scraper dryer 9 is connected with a filtrate barrel 10;

the filtrate barrel 10 is used for sending filtrate into a calcium-removing brine barrel 12, and the outlet of the filtrate barrel 10 is connected with the calcium-removing brine barrel 12 through a filtrate pump 11;

the calcium-removing brine barrel 12 is used for temporarily storing clear liquid and filtrate, concentration sampling is carried out in the calcium-removing brine barrel 12, the outlet of the calcium-removing brine barrel 12 is divided into two paths by a calcium-removing brine pump 13, one path is connected with the salt dissolving tank 16, and the other path is connected with the brine barrel 14;

the salt dissolving pool 16 is used for adjusting the concentration of sodium chloride, and the outlet of the salt dissolving pool 16 is connected with the brine barrel 14;

brine tank 14 is used for brine discharge.

A wastewater zero-discharge treatment process suitable for calcium sulfate whisker production comprises the following steps:

step 1) using raw materials of mirabilite tailing brine and calcium chloride byproduct of alkali factory to produce calcium sulfate whisker, wherein the parameters of the mirabilite tailing brine are as follows: the concentration of sodium chloride is controlled to be 250000ppm-290000ppm, and the concentration of sodium sulfate is controlled to be 60000ppm-90000 ppm; the adding molar ratio of sodium sulfate in the mirabilite tailing brine to calcium chloride byproduct in an alkali plant is 1.05:1-1.20:1, and the produced wastewater is sent into a mixed water barrel 1 to obtain mixed liquid;

step 2) sending the mixed liquid in the mixed water barrel 1 into a baffling tank 3 to be mixed with alkaline water and then sending into a reaction clear water barrel 4, and separating sludge and clear liquid through the reaction clear water barrel 4;

and 3) conveying the sludge into a drying device for drying to obtain calcium carbonate, which specifically comprises the following steps: the sludge is sent into a roller scraper dryer 9 through a calcium sludge barrel 7, calcium carbonate is obtained after drying, and filtrate generated in the drying process is sent into a calcium-removing brine barrel 12 through a filtrate barrel 10;

step 4), delivering the clear liquid into a calcium-removing brine barrel 12, and sampling the concentration of sodium chloride in the calcium-removing brine barrel 12, wherein if the concentration reaches a set value, delivering the clear liquid into a brine barrel 14 and selling the clear liquid outside the brine barrel 14; if the concentration does not reach the set value, the brine is sent into the salt dissolving pool 16, sodium chloride is added, the brine is sent into the brine barrel 14 after the concentration reaches the set value, and the brine is sold out of the brine barrel 14.

The invention is further illustrated by the following examples.