阅读说明：本技术 一种垃圾焚烧飞灰稳定剂及其加工工艺 (Waste incineration fly ash stabilizer and processing technology thereof ) 是由 吴长淋 金德勇 于 2021-09-14 设计创作，主要内容包括：本发明公开了一种垃圾焚烧飞灰稳定剂及其加工工艺,包括以下制备步骤：取植酸、甲基丙烯酸缩水甘油醚反应,得到产物A；取产物A、乙二胺、三羟甲基丙烷三丙烯酸酯反应,得到产物B；取产物B、硫脲反应,得到稳定剂。本发明通过植酸与甲基丙烯酸缩水甘油醚,得到双键；然后与乙二胺、三羟甲基丙烷三丙烯酸酯共聚,并与硫脲接枝,制得具有交联网络的高分子化合物；该稳定剂中众多官能团,能够与飞灰中的重金属结合,其枝状网络结构及枝节中的官能团,增大稳定剂对飞灰中重金属的捕捉力度,有效降低重金属的浸出毒性,提高稳定剂对飞灰的稳定效果；且能够降低稳定后的飞灰对强酸强碱的敏感性,使其适应填埋场pH的环境,提高环境安全性。(The invention discloses a waste incineration fly ash stabilizer and a processing technology thereof, and the method comprises the following preparation steps: reacting phytic acid and glycidyl methacrylate to obtain a product A; taking the product A, ethylenediamine and trimethylolpropane triacrylate to react to obtain a product B; and taking the product B to react with thiourea to obtain the stabilizer. The double bonds are obtained by phytic acid and glycidyl methacrylate; then copolymerizing with ethylenediamine and trimethylolpropane triacrylate, and grafting with thiourea to prepare a high molecular compound with a cross-linked network; the multifunctional group in the stabilizer can be combined with heavy metal in the fly ash, and the dendritic network structure and the functional groups in the branches and knots of the stabilizer increase the capturing force of the stabilizer on the heavy metal in the fly ash, effectively reduce the leaching toxicity of the heavy metal and improve the stabilizing effect of the stabilizer on the fly ash; and the sensitivity of the stabilized fly ash to strong acid and strong base can be reduced, so that the fly ash is suitable for the environment of landfill pH, and the environmental safety is improved.)

1. A processing technology of a waste incineration fly ash stabilizer is characterized in that: the preparation method comprises the following preparation steps:

reacting phytic acid and glycidyl methacrylate to obtain a product A;

taking the product A, ethylenediamine and trimethylolpropane triacrylate to react to obtain a product B;

and taking the product B to react with thiourea to obtain the stabilizer.

2. The process for preparing fly ash stabilizer for waste incineration according to claim 1, wherein the process comprises the following steps: the preparation method comprises the following preparation steps:

adding phytic acid into glycidyl methacrylate, mixing, introducing nitrogen, adding deionized water and potassium persulfate, and heating to react in a nitrogen atmosphere to obtain a product A;

adding methanol into the product A, cooling in a nitrogen atmosphere, adding ethylenediamine and trimethylolpropane triacrylate, and reacting in a dark place to obtain a product B;

mixing 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride and dichloromethane, sequentially adding a product B, thiourea and triethylamine, uniformly stirring, and reacting at room temperature to obtain the stabilizer.

3. The process for preparing fly ash stabilizer for waste incineration according to claim 2, wherein: the preparation method comprises the following preparation steps:

adding phytic acid into glycidyl methacrylate, mixing, introducing nitrogen, adding deionized water and potassium persulfate, stirring and mixing in a nitrogen atmosphere, adjusting the temperature of the system to 70-80 ℃, reacting for 7-8 h, washing, and drying to obtain a product A;

and (2) adding methanol into the product A, mixing, introducing nitrogen, adjusting the temperature of the system to 0-1 ℃, sequentially adding ethylenediamine and trimethylolpropane triacrylate in the nitrogen atmosphere, keeping the temperature of the system at 0-1 ℃, reacting for 72-80 h under a dark condition, and carrying out reduced pressure distillation, wherein the process conditions are as follows: the temperature is 80-85 ℃, and the pressure is 0.08-0.10 MPa until the weight of the product is constant, so as to obtain a product B;

mixing 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride and dichloromethane, sequentially adding a product B, thiourea and triethylamine, uniformly stirring, reacting for 5-8 h, slowly heating to 30-45 ℃, and reacting for 3-5 h to obtain the stabilizer.

4. The process for preparing fly ash stabilizer for waste incineration according to claim 1, wherein the process comprises the following steps: the mass ratio of the phytic acid to the glycidyl methacrylate is 10 (9.0-13.5).

5. The process for preparing fly ash stabilizer for waste incineration according to claim 1, wherein the process comprises the following steps: the mass ratio of the product A to the ethylene diamine to the trimethylolpropane triacrylate is (1.3-2.4): (1.8-3.0): 1.0-2.5).

6. The process for preparing fly ash stabilizer for waste incineration according to claim 1, wherein the process comprises the following steps: the mass ratio of the product B to the thiourea is (3-5) to (3-7).

7. A waste incineration fly ash stabilizer produced by the process for processing a waste incineration fly ash stabilizer according to any one of claims 1 to 6.

Technical Field

The invention relates to the technical field of fly ash stabilizers, in particular to a waste incineration fly ash stabilizer and a processing technology thereof.

Background

Waste which is lost in use and cannot be utilized is called garbage, and is an important link of material circulation. People can produce a large amount of garbage in production and life, the garbage with large volume and quantity can extrude living space of people, pollute the environment such as soil and water resources, has great harm and needs to be treated. The common garbage disposal method is to collect and send the garbage to a landfill area for landfill or incinerate the garbage by an incinerator. The garbage incineration has the advantages of reduction, harmlessness, resource utilization and the like, is generally applied to China, and is an effective technical means for relieving and solving the dilemma of domestic and foreign municipal garbage disposal at present. However, during the incineration of garbage, fly ash rich in heavy metal elements such as zinc, copper, chromium, cadmium, etc. is generated. The fly ash is easy to leach heavy metals, belongs to dangerous waste and causes secondary pollution to the environment. Before the fly ash is finally treated, the fly ash must be subjected to harmless treatment so as to immobilize the heavy metals in the fly ash, and the fly ash can enter a landfill link after the fly ash meets the technical requirements of national environmental protection.

The fly ash heavy metal immobilization technology comprises the solidification and stabilization of fly ash. The solidification is to contain heavy metals in a fly ash solidified body with certain hardness and larger volume; after curing, the surface area of the heavy metal in contact with the environment is significantly reduced, thereby limiting its migration. The stabilization is realized by adding a chemical agent to perform chemical reaction with heavy metal, so that the heavy metal is converted into a substance with lower solubility, lower mobility, weaker toxicity and more stable structure; and the method has the advantages of small compatibilization ratio, low energy consumption and simple process, and is widely used. The organic and inorganic compounds can be classified into two types, i.e., inorganic ones and organic ones, depending on the type of the agent. Inorganic stabilizing agents are commonly used, but when the environmental pH condition is changed, heavy metals in fly ash can be leached, and the long-term safety requirement of incineration waste treatment cannot be met. Compared with the traditional inorganic medicament, the organic stabilizing medicament has higher limitation on the chelating effect of heavy metals, and the stabilizing treatment effect on various heavy metal pollutants in the waste incineration fly ash is proved by tests. However, some of the existing organic fly ash stabilizing agents are used in a large amount, are sensitive to the acidity and alkalinity of a stabilizing system, and have unstable stabilizing effect on heavy metals in fly ash. Therefore, we propose a waste incineration fly ash stabilizer and a processing technology thereof.

Disclosure of Invention

The invention aims to provide a waste incineration fly ash stabilizer and a processing technology thereof, which aim to solve the problems in the background technology.

In order to solve the technical problems, the invention provides the following technical scheme: a processing technology of a waste incineration fly ash stabilizer comprises the following preparation steps:

reacting phytic acid and glycidyl methacrylate to obtain a product A;

taking the product A, ethylenediamine and trimethylolpropane triacrylate to react to obtain a product B;

and taking the product B to react with thiourea to obtain the stabilizer.

Further, the method comprises the following preparation steps:

adding phytic acid into glycidyl methacrylate, mixing, introducing nitrogen, adding deionized water and potassium persulfate, and heating to react in a nitrogen atmosphere to obtain a product A;

adding methanol into the product A, cooling in a nitrogen atmosphere, adding ethylenediamine and trimethylolpropane triacrylate, and reacting in a dark place to obtain a product B;

mixing 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride and dichloromethane, sequentially adding a product B, thiourea and triethylamine, uniformly stirring, and reacting at room temperature to obtain the stabilizer.

Further, the method comprises the following preparation steps:

adding phytic acid into glycidyl methacrylate, mixing, introducing nitrogen, adding deionized water and potassium persulfate, stirring and mixing in a nitrogen atmosphere, adjusting the temperature of the system to 70-80 ℃, reacting for 7-8 h, washing, and drying to obtain a product A;

in the technical scheme, the phytic acid has a phosphate carboxyl group and can react with an epoxy group in glycidyl methacrylate to polymerize the phytic acid and the glycidyl methacrylate to synthesize a phytic acid cross-linked polymer (product A), carbon-carbon double bonds are introduced into the phytic acid, the influence of pH on the phytic acid is eliminated, the heavy metal in the fly ash can be complexed, the sensitivity of the prepared stabilizer to strong acid and strong base is reduced, and the environment safety of the stabilizer during use is realized;

and (2) adding methanol into the product A, mixing, introducing nitrogen, adjusting the temperature of the system to 0-1 ℃, sequentially adding ethylenediamine and trimethylolpropane triacrylate in the nitrogen atmosphere, keeping the temperature of the system at 0-1 ℃, reacting for 72-80 h under a dark condition, and carrying out reduced pressure distillation, wherein the process conditions are as follows: the temperature is 80-85 ℃, and the pressure is 0.08-0.10 MPa until the weight of the product is constant, so as to obtain a product B;

in the technical scheme, the trimethylolpropane triacrylate also has a carbon-carbon double bond, and amino in the ethylenediamine can react with the carbon-carbon double bond, so that the ethylenediamine is used as a cross-linking agent to connect the phytic acid cross-linked polymer (product A) and the trimethylolpropane triacrylate to form an organic compound with a relatively large molecular weight, and a high molecular compound (product B) with a multi-branched network structure is obtained, has a large number of amino groups, reduces the acidity of the prepared stabilizer, improves the strong acid and strong alkali resistance of the stabilizer, has oxygen ether, ester groups and the like, promotes the complexation between heavy metal substances in the fly ash and the stabilizer, and improves the stabilizing effect of the prepared stabilizer on the fly ash;

mixing 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride and dichloromethane, sequentially adding a product B, thiourea and triethylamine, uniformly stirring, reacting for 5-8 h, slowly heating to 30-45 ℃, and reacting for 3-5 h to obtain the stabilizer.

In the technical scheme, the amino on the product B is grafted with thiourea, and the thiourea with excellent stabilizing effect is introduced into a system of a high-molecular organic stabilizer, so that the stabilizing effect of the prepared stabilizer on heavy metals in fly ash can be effectively improved, and the leaching toxicity of the heavy metals is effectively reduced; the thiourea is combined with the amino, so that the influence of the pH value of the environment on the effective state of heavy metal in the fly ash is reduced, the stabilizing effect of the prepared stabilizer on the fly ash is improved, the fly ash after stabilization is prevented from migrating after landfill, and the environmental safety is improved; the prepared stabilizer can be fully dispersed in aqueous solution, has lower viscosity and excellent service performance.

Furthermore, the mass ratio of the phytic acid to the glycidyl methacrylate is 10 (9.0-13.5).

Furthermore, the mass ratio of the product A, the ethylenediamine and the trimethylolpropane triacrylate is (1.3-2.4): (1.8-3.0): 1.0-2.5).

Furthermore, the mass ratio of the product B to the thiourea is (3-5) to (3-7).

Compared with the prior art, the invention has the following beneficial effects:

the waste incineration fly ash stabilizer and the processing technology thereof prepare the phytic acid derivative containing double bonds through the grafting reaction of phytic acid and glycidyl methacrylate; then copolymerizing with ethylenediamine and trimethylolpropane triacrylate to obtain a compound with higher molecular weight; then, the amino in the substance is grafted with thiourea to prepare a high molecular compound with a cross-linked network as a stabilizer; the multifunctional groups in the stabilizer are combined with the heavy metal in the fly ash through ionic bonds, covalent bonds, coordination bonds and the like, and due to the dendritic network structure and the functional groups in the branches, the capturing strength of the prepared stabilizer on the heavy metal in the fly ash is increased, the leaching toxicity of the heavy metal is effectively reduced, and the stabilizing effect of the stabilizer on the fly ash is improved; and the combination stability between heavy metal in the fly ash and the stabilizer is better, the sensitivity of the stabilized fly ash to strong acid and strong base is reduced, the fly ash can adapt to the environment of landfill pH, the material state is stable, the effect is good, the migration cannot occur, and the environmental safety is improved.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Adding phytic acid into glycidyl methacrylate, mixing, introducing nitrogen, adding deionized water and potassium persulfate, stirring and mixing in a nitrogen atmosphere, adjusting the temperature of the system to 70 ℃, reacting for 7 hours, washing and drying to obtain a product A; wherein the mass ratio of the phytic acid to the glycidyl methacrylate is 10: 9.0;

and (2) adding methanol into the product A, mixing, introducing nitrogen, adjusting the temperature of the system to 1 ℃, sequentially adding ethylenediamine and trimethylolpropane triacrylate in the nitrogen atmosphere, keeping the temperature of the system at 1 ℃, reacting for 72 hours in a dark condition, and carrying out reduced pressure distillation, wherein the process conditions are as follows: the temperature is 80 ℃ and the pressure is 0.08MPa until the weight of the product is constant, thus obtaining a product B; wherein the mass ratio of the product A to the ethylenediamine to the trimethylolpropane triacrylate is 1.3:1.8: 1.0;

mixing 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride and dichloromethane, sequentially adding a product B, thiourea and triethylamine, uniformly stirring, reacting for 5 hours, slowly heating to 30 ℃, and reacting for 3 hours to obtain a stabilizer; wherein the mass ratio of the product B to the thiourea is 3: 4.

Example 2

Adding phytic acid into glycidyl methacrylate, mixing, introducing nitrogen, adding deionized water and potassium persulfate, stirring and mixing in a nitrogen atmosphere, adjusting the temperature of the system to 75 ℃, reacting for 7.5h, washing and drying to obtain a product A; wherein the mass ratio of the phytic acid to the glycidyl methacrylate is 10: 11.2;

adding methanol into the product A, mixing, introducing nitrogen, adjusting the temperature of the system to 0 ℃, sequentially adding ethylenediamine and trimethylolpropane triacrylate in the nitrogen atmosphere, keeping the temperature of the system at 0 ℃, reacting for 75 hours in a dark condition, and carrying out reduced pressure distillation, wherein the process conditions are as follows: the temperature is 82 ℃ and the pressure is 0.09MPa until the weight of the product is constant, thus obtaining a product B; wherein the mass ratio of the product A to the ethylenediamine to the trimethylolpropane triacrylate is 1.8:2.4: 1.7;

mixing 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride and dichloromethane, sequentially adding a product B, thiourea and triethylamine, uniformly stirring, reacting for 7 hours, slowly heating to 36 ℃, and reacting for 4 hours to obtain a stabilizer; wherein the mass ratio of the product B to the thiourea is 4: 5.

Example 3

Adding phytic acid into glycidyl methacrylate, mixing, introducing nitrogen, adding deionized water and potassium persulfate, stirring and mixing in a nitrogen atmosphere, adjusting the temperature of the system to 80 ℃, reacting for 8 hours, washing and drying to obtain a product A; wherein the mass ratio of the phytic acid to the glycidyl methacrylate is 10: 13.5;

adding methanol into the product A, mixing, introducing nitrogen, adjusting the temperature of the system to 0 ℃, sequentially adding ethylenediamine and trimethylolpropane triacrylate in the nitrogen atmosphere, keeping the temperature of the system at 0 ℃, reacting for 80 hours in a dark condition, and carrying out reduced pressure distillation, wherein the process conditions are as follows: the temperature is 85 ℃, and the pressure is 0.10MPa until the weight of the product is constant, thus obtaining a product B; wherein the mass ratio of the product A to the ethylenediamine to the trimethylolpropane triacrylate is 2.4:3.0: 2.5;

mixing 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride and dichloromethane, sequentially adding a product B, thiourea and triethylamine, uniformly stirring, reacting for 8 hours, slowly heating to 45 ℃, and reacting for 5 hours to obtain a stabilizer; wherein the mass ratio of the product B to the thiourea is 5: 7.

Comparative example 1

Taking methanol, introducing nitrogen, adjusting the system temperature to 1 ℃, sequentially adding ethylenediamine and trimethylolpropane triacrylate in the nitrogen atmosphere, keeping the system temperature at 1 ℃, reacting for 72 hours in a dark condition, and carrying out reduced pressure distillation, wherein the process conditions are as follows: the temperature is 80 ℃ and the pressure is 0.08MPa until the weight of the product is constant, and a reaction product is obtained; wherein the mass ratio of the ethylenediamine to the trimethylolpropane triacrylate is 1.8: 1.0;

mixing 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride and dichloromethane, sequentially adding a reaction product, thiourea and triethylamine, uniformly stirring, reacting for 5 hours, slowly heating to 30 ℃, and reacting for 3 hours to obtain a stabilizer; wherein the mass ratio of the product B to the thiourea is 3: 4.

Comparative example 2

Adding phytic acid into glycidyl methacrylate, mixing, introducing nitrogen, adding deionized water and potassium persulfate, stirring and mixing in a nitrogen atmosphere, adjusting the temperature of the system to 70 ℃, reacting for 7 hours, washing and drying to obtain a product A; wherein the mass ratio of the phytic acid to the glycidyl methacrylate is 10: 9.0;

and (2) adding methanol into the product A, mixing, introducing nitrogen, adjusting the temperature of the system to 1 ℃, sequentially adding ethylenediamine and trimethylolpropane triacrylate in the nitrogen atmosphere, keeping the temperature of the system at 1 ℃, reacting for 72 hours in a dark condition, and carrying out reduced pressure distillation, wherein the process conditions are as follows: the temperature is 80 ℃, and the pressure is 0.08MPa until the product has constant weight, so as to obtain the stabilizer; wherein the mass ratio of the product A to the ethylenediamine to the trimethylolpropane triacrylate is 1.3:1.8: 1.0.

Comparative example 3

Adding methanol into glycidyl methacrylate, mixing, introducing nitrogen, adjusting the temperature of a system to 1 ℃, sequentially adding ethylenediamine and trimethylolpropane triacrylate in the nitrogen atmosphere, keeping the temperature of the system at 1 ℃, reacting for 72 hours in a dark condition, and carrying out reduced pressure distillation, wherein the process conditions are as follows: the temperature is 80 ℃ and the pressure is 0.08MPa until the weight of the product is constant, thus obtaining a product B; wherein the mass ratio of the glycidyl methacrylate to the ethylenediamine to the trimethylolpropane triacrylate is 1.3:1.8: 1.0;

mixing 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride and dichloromethane, sequentially adding a product B, thiourea and triethylamine, uniformly stirring, reacting for 5 hours, slowly heating to 30 ℃, and reacting for 3 hours to obtain a stabilizer; wherein the mass ratio of the product B to the thiourea is 3: 4.

Comparative example 4

Adding DOPO into glycidyl methacrylate, mixing, introducing nitrogen, adding deionized water and potassium persulfate, stirring and mixing in a nitrogen atmosphere, adjusting the temperature of the system to 70 ℃, reacting for 7 hours, washing and drying to obtain a product A; wherein the mass ratio of DOPO to glycidyl methacrylate is 2: 9;

and (2) adding methanol into the product A, mixing, introducing nitrogen, adjusting the temperature of the system to 1 ℃, sequentially adding ethylenediamine and trimethylolpropane triacrylate in the nitrogen atmosphere, keeping the temperature of the system at 1 ℃, reacting for 72 hours in a dark condition, and carrying out reduced pressure distillation, wherein the process conditions are as follows: the temperature is 80 ℃ and the pressure is 0.08MPa until the weight of the product is constant, thus obtaining a product B; wherein the mass ratio of the product A to the ethylenediamine to the trimethylolpropane triacrylate is 1.3:1.8: 1.0;

mixing 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride and dichloromethane, sequentially adding a product B, thiourea and triethylamine, uniformly stirring, reacting for 5 hours, slowly heating to 30 ℃, and reacting for 3 hours to obtain a stabilizer; wherein the mass ratio of the product B to the thiourea is 3: 4.

Comparative example 5

Taking methanol, introducing nitrogen, adjusting the system temperature to 1 ℃, sequentially adding ethylenediamine and trimethylolpropane triacrylate in the nitrogen atmosphere, keeping the system temperature at 1 ℃, reacting for 72 hours in a dark condition, and carrying out reduced pressure distillation, wherein the process conditions are as follows: the temperature is 80 ℃ and the pressure is 0.08MPa until the weight of the product is constant, thus obtaining a product B; wherein the mass ratio of the ethylenediamine to the trimethylolpropane triacrylate is 1.8: 1.0;

mixing the product A with deionized water, cooling to 0 ℃, introducing nitrogen, slowly adding a sodium hydroxide solution, keeping the temperature, slowly adding an ethanol solution of carbon disulfide, reacting for 5 hours, slowly heating to 45 ℃, and reacting for 3 hours to obtain a stabilizer, wherein the mass ratio of the product A to the carbon disulfide is 47.6: 85.5.

comparative example 6

Disodium ethylene diamine tetraacetate is taken as a stabilizer.

Experiment of

Taking the stabilizers obtained in examples 1-3 and comparative examples 1-6, samples were prepared, and the performance thereof was measured and the results were recorded:

(1) the removal rate is as follows:

experimental groups: taking 10g of dried waste incineration fly ash, adding an aqueous solution containing 3% of a sample as an extraction solution, wherein the liquid-solid ratio is 10:1 (L/kg); oscillating at the oscillation frequency of 110 times/min for 8h at room temperature, standing for 16h, and filtering to obtain the extract.

Blank group: taking 10g of dried waste incineration fly ash, and adding deionized water as leaching solution, wherein the liquid-solid ratio is 10:1 (L/kg); oscillating at the oscillation frequency of 110 times/min for 8h at room temperature, standing for 16h, and filtering to obtain the extract.

And (3) detecting the content and leaching concentration of each group of heavy metals by taking HJ786-2016, HJ751-2015 and HJ749-2015 as measurement standards, and calculating the removal rate of the heavy metals.

(2) pH stability:

experimental groups: taking two groups of deionized water, sequentially adjusting the pH value to be 4 and 12, adding a sample to prepare an aqueous solution containing 3 percent of the sample, mixing the aqueous solution with 10g of dried waste incineration fly ash, wherein the liquid-solid ratio is 10:1(L/kg), and sequentially adjusting the pH value of the system to be 4 and 12; oscillating at the oscillation frequency of 110 times/min for 8h at room temperature, standing for 16h, and filtering to obtain the extract.

And detecting the content of heavy metal and the leaching concentration by taking HJ786-2016, HJ751-2015 and HJ749-2015 as measurement standards.

Blank group: taking two groups of deionized water, sequentially adjusting the pH values to be 4 and 12, and mixing the two groups of deionized water with 10g of dried waste incineration fly ash, wherein the liquid-solid ratio is 10:1 (L/kg); three groups are arranged, and the pH of the system is sequentially adjusted to 4 and 12; oscillating at the oscillation frequency of 110 times/min for 8h at room temperature, standing for 16h, and filtering to obtain the extract.

And (3) detecting the content and leaching concentration of each group of heavy metals by taking HJ786-2016, HJ751-2015 and HJ749-2015 as measurement standards, and calculating the removal rate of the heavy metals.

From the data in the table above, it is clear that the following conclusions can be drawn:

the stabilizers obtained in examples 1 to 3 and the stabilizers obtained in comparative examples 1 to 6 were compared, and the results of the measurements revealed that:

1. compared with the comparative example 6, the stabilizers obtained in the examples 1 to 3 have better removal effect on each heavy metal in water environment with each pH value, which fully shows that the invention realizes the improvement of the stabilizing effect and the acid and alkali resistance of the prepared stabilizer;

2. compared with example 1, the product a was not added in comparative example 1, thiourea was not added in comparative example 2, phytic acid was not added in comparative example 3, phytic acid was replaced with DOPO in comparative example 4, the product a was not added in comparative example 5 and thiourea was replaced with carbon disulfide, and the stabilizer in comparative example 6 was disodium ethylenediaminetetraacetate, which has a decreased removal effect on each heavy metal in water environment of each pH, it is known that the provision of the stabilizer component and the preparation process thereof in the present invention can promote the improvement of the stabilizing effect and the acid and alkali resistance of the prepared stabilizer.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process method article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process method article or apparatus.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.