CN112402889A - Chelating agent - Google Patents
Chelating agent Download PDFInfo
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- CN112402889A CN112402889A CN202110052142.2A CN202110052142A CN112402889A CN 112402889 A CN112402889 A CN 112402889A CN 202110052142 A CN202110052142 A CN 202110052142A CN 112402889 A CN112402889 A CN 112402889A
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- sodium
- chelating agent
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D3/00—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances
- A62D3/30—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents
- A62D3/33—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents by chemical fixing the harmful substance, e.g. by chelation or complexation
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D2101/00—Harmful chemical substances made harmless, or less harmful, by effecting chemical change
- A62D2101/40—Inorganic substances
- A62D2101/43—Inorganic substances containing heavy metals, in the bonded or free state
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a chelating agent, and a preparation method thereof comprises the following steps: firstly, selecting the following raw materials in percentage by weight: 10-60% of organic sulfide, 1-30% of inorganic sulfide, 1-20% of inorganic phosphide and 1-30% of organic low-molecular-weight dispersant; secondly, adding the organic sulfide into water with the proportion of 1:5, stirring until the organic sulfide is completely dissolved, and filtering to obtain a clear solution; thirdly, adding inorganic sulfide into the clarified solution, and stirring until the inorganic sulfide is completely dissolved to obtain a mixed clarified solution; and fourthly, adding the organic low molecular weight dispersant into the mixed clarified solution, adding the inorganic phosphide after stirring, and fully stirring to obtain the multi-component composite chelating agent. The composite chelating agent obtained by the invention can improve the performance, the obtained fly ash chelating agent has high stability, good dispersibility and homogeneity, and the chelating agent has the advantages of high reaction speed, reduced chelating time, improved chelating effect and more comprehensive chelation in the application process.
Description
Technical Field
The invention belongs to the technical field of chelating agents, and particularly relates to a compound chelating agent.
Background
The fly ash from the incineration of the household garbage has complex components, and the main pollutants are heavy metals with high leaching toxicity, which have serious harm to the environment. Heavy metals are continuously migrated and transformed in the environment, and polluted soil and water environment cannot be eliminated through self purification, and cannot be decomposed by microorganisms and can be enriched through a biological chain, so that the heavy metals in pollutants are lost into the environment due to improper treatment of fly ash, and serious harm is caused to human health and natural environment. Currently, the most common treatment methods are:
1. the cement solidification technology is adopted to carry out solidification treatment on heavy metals, and the heavy metals react with hydrated cement through ion exchange, passivation, adsorption, chemical adsorption, sedimentation, and finally form relatively stable compounds such as hydroxide or complex compounds on the surface of hydrated silicate colloid of the cement.
2. Chemical stabilization is a method in which a chemical agent chemically reacts with a heavy metal to convert its ion into a low-solubility, low-mobility polymer complex or an inorganic mineral. The cement curing technology has the defects of large addition amount, large capacity increase of fly ash and large landfill volume; in the related technology, a chemical agent stabilization method is adopted, the adopted chelating agent is mostly a DTC chelating agent (dithiocarbamate is DTC for short), the chelating agent belongs to a non-high molecular compound, the unit molecular weight contains few complexing centers, the leachable concentration of a complex generated by the chelating agent and heavy metal is high, and the heavy metal ion separation effect is poor.
Therefore, a preparation method of a heavy metal chelating agent is applied, and the preparation method is disclosed as CN201710109526.7, and comprises the following steps: dissolving 4,4' -triaminotriphenylmethane serving as a raw material in an ethanol aqueous solution, and adjusting the pH value of the solution to 10-12 by using a sodium hydroxide solution; under the ice-bath condition, gradually dropwise adding carbon disulfide; wherein the molar addition amount of the carbon disulfide is 3-3.5 times of the molar amount of 4,4' -triaminotriphenylmethane, and the dropping speed is 5-10 ml/min; and (3) after the carbon disulfide is dropwise added, reacting for 5-10 hours under a stirring state, and continuously dropwise adding the sodium hydroxide solution until the solution is free of flocculation, thus obtaining the heavy metal chelating agent. According to the preparation method of the heavy metal chelating agent, the prepared heavy metal chelating agent has the advantages of large number of chelating centers per unit molecular weight and low leaching concentration. The chelating agent has the disadvantages of single chelating and incomplete chelating.
The existing chelating agent has single chelating agent and has selectivity, so that the leaching requirement is difficult to achieve; furthermore, the components of the polybasic chelating agent are not mutually soluble and have mutually reduced effect.
Therefore, how to solve the above-mentioned drawbacks of the prior art becomes the direction of efforts of those skilled in the art.
Disclosure of Invention
The invention aims to provide a chelating agent which can improve the chelating effect, enables the chelating to be more comprehensive and can completely solve the defects of the prior art.
The purpose of the invention is realized by the following technical scheme: a chelating agent, the preparation method of which comprises the following steps:
firstly, selecting the following raw materials in percentage by weight: 10-60% of organic sulfide, 1-30% of inorganic sulfide, 1-20% of inorganic phosphide and 1-30% of organic low-molecular-weight dispersant;
secondly, adding the organic sulfide into water with the proportion of 1:5, stirring until the organic sulfide is completely dissolved, and filtering to obtain a clear solution;
thirdly, adding inorganic sulfide into the clarified solution, and stirring until the inorganic sulfide is completely dissolved to obtain a mixed clarified solution;
and fourthly, adding the organic low molecular weight dispersant into the mixed clarified solution, adding the inorganic phosphide after stirring, and fully stirring to obtain the multi-component composite chelating agent.
As one of preferable embodiments of the raw material, the organic sulfide is any one of dimethyldithiocarbamate and diethyldithiocarbamate; the inorganic sulfide is one or a mixture of two of sodium sulfide and sodium thiosulfate; the inorganic phosphate is one of disodium hydrogen phosphate, sodium pyrophosphite and sodium dihydrogen phosphate; the organic low molecular weight dispersant is any one of ammonium polyacrylate, polyacrylamide, sodium polyacrylate and potassium polyacrylate.
As a preferred preparation method, the preparation method comprises the following steps:
firstly, adding 50g of sodium dimethyldithiocarbamate into 50g of water, stirring until the sodium dimethyldithiocarbamate is completely dissolved, and filtering to obtain a clear solution;
secondly, adding 15g of sodium thiosulfate into the clear solution, and stirring until the sodium thiosulfate is completely dissolved to obtain a mixed clear solution;
and thirdly, adding 30g of polyacrylamide with the molecular weight lower than 2000 into the mixed clarified solution, stirring, adding 10g of disodium hydrogen phosphate, and fully stirring to obtain the multi-component composite chelating agent.
As one of the preferable proportioning schemes of the raw materials, the raw materials are prepared according to the following weight percentage: 35.0g of sodium dimethyldithiocarbamate, 5g of disodium hydrogen phosphate, 5g of sodium thiosulfate, 15g of polyacrylamide and 50.0g of water.
As one of the preferable proportioning schemes of the raw materials, the raw materials are prepared according to the following weight percentage: 49.5g of sodium dimethyldithiocarbamate, 10.0g of disodium hydrogen phosphate, 15.2g of sodium thiosulfate, 28g of polyacrylamide and 50.0g of water.
As one of the preferable proportioning schemes of the raw materials, the raw materials are prepared according to the following weight percentage: 47.0g of sodium dimethyldithiocarbamate, 9.5g of disodium hydrogen phosphate, 13g of sodium thiosulfate, 29g of polyacrylamide and 50.0g of water.
As one of the preferable proportioning schemes of the raw materials, the raw materials are prepared according to the following weight percentage: 45.5g of sodium diethyldithiocarbamate, 8g of sodium pyrophosphite, 10g of sodium sulfide, 25g of sodium polyacrylate and 50.0g of water.
As one of the preferable proportioning schemes of the raw materials, the raw materials are prepared according to the following weight percentage: 40g of sodium diethyldithiocarbamate, 7g of sodium pyrophosphite, 6g of sodium sulfide, 20g of sodium polyacrylate and 50.0g of water.
As one of the preferable proportioning schemes of the raw materials, the raw materials are prepared according to the following weight percentage: 26g of sodium dimethyldithiocarbamate, 18g of sodium diethyldithiocarbamate, 9g of sodium pyrophosphite, 8g of sodium sulfide, 23g of sodium polyacrylate and 50.0g of water.
Compared with the prior art, the invention has the beneficial effects that: the composite chelating agent is obtained by the method disclosed by the invention, so that the purpose of improving the performance is achieved, the obtained fly ash chelating agent is high in stability, good in dispersibility and homogeneous, and the chelating agent has the advantages of high reaction speed, short chelating time, improved chelating effect and more comprehensive chelation in the application process.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious 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.
A chelating agent, the preparation method of which comprises the following steps:
firstly, selecting the following raw materials in percentage by weight: 10-60% of organic sulfide, 1-30% of inorganic sulfide, 1-20% of inorganic phosphide and 1-30% of organic low-molecular-weight dispersant.
Wherein: the organic sulfide is one of dimethyl dithiocarbamate and diethyl dithiocarbamate; dimethyldithiocarbamate has the formula C3H6NNaS2. Molecular weight 143.21, organic synthesis intermediates, polymerization shortstopping agents. The inorganic sulfide is one or a mixture of two of sodium sulfide and sodium thiosulfate. The inorganic phosphate is one of disodium hydrogen phosphate, sodium pyrophosphite and sodium dihydrogen phosphate. The organic low molecular weight dispersant is any one of ammonium polyacrylate, polyacrylamide, sodium polyacrylate and potassium polyacrylate.
Secondly, adding the organic sulfide into water with the proportion of 1:5, stirring until the organic sulfide is completely dissolved, and filtering to obtain a clear solution;
thirdly, adding inorganic sulfide into the clarified solution, and stirring until the inorganic sulfide is completely dissolved to obtain a mixed clarified solution;
and fourthly, adding the organic low molecular weight dispersant into the mixed clarified solution, adding the inorganic phosphide after stirring, and fully stirring to obtain the multi-component composite chelating agent.
The application example is as follows:
example 1
A preparation method of a multi-component complex chelating agent comprises the following steps:
firstly, adding 50g of sodium dimethyldithiocarbamate into 50g of water, stirring until the sodium dimethyldithiocarbamate is completely dissolved, and filtering to obtain a clear solution;
secondly, adding 15g of sodium thiosulfate into the clear solution, and stirring until the sodium thiosulfate is completely dissolved to obtain a mixed clear solution;
and thirdly, adding 30g of polyacrylamide (the molecular weight is lower than 2000) into the mixed clarified solution, stirring, adding 10g of disodium hydrogen phosphate, and fully stirring to obtain the multi-component composite chelating agent.
Example 2
Example 2 is prepared in the same manner as example 1, except that the formulation of the polybasic complex chelating agent is: 35.0g of sodium dimethyldithiocarbamate, 5g of disodium hydrogen phosphate, 5g of sodium thiosulfate, 15g of polyacrylamide and 50.0g of water.
Example 3
Example 3 is prepared in the same manner as example 1, except that the formulation of the polybasic complex chelating agent is: 49.5g of sodium dimethyldithiocarbamate, 10.0g of disodium hydrogen phosphate, 15.2g of sodium thiosulfate, 28g of polyacrylamide and 50.0g of water.
Example 4
Example 4 is prepared in the same manner as example 1, except that the formulation of the polybasic complex chelating agent is: 47.0g of sodium dimethyldithiocarbamate, 9.5g of disodium hydrogen phosphate, 13g of sodium thiosulfate, 29g of polyacrylamide and 50.0g of water.
Example 5
Example 5 is prepared in the same manner as example 1, except that the formulation of the polybasic complex chelating agent is: 45.5g of sodium diethyldithiocarbamate, 8g of sodium pyrophosphite, 10g of sodium sulfide, 25g of sodium polyacrylate and 50.0g of water.
Example 6
Example 6 the same preparation method as example 1, except that the formula of the multi-component chelating agent is: 40g of sodium diethyldithiocarbamate, 7g of sodium pyrophosphite, 6g of sodium sulfide, 20g of sodium polyacrylate and 50.0g of water.
Example 7
Example 7 is prepared in the same manner as example 1, except that the formulation of the polybasic complex chelating agent is: 26g of sodium dimethyldithiocarbamate, 18g of sodium diethyldithiocarbamate, 9g of sodium pyrophosphite, 8g of sodium sulfide, 23g of sodium polyacrylate and 50.0g of water.
After the multi-component composite chelating agents prepared in the above examples 1 to 7 were sampled, the samples were diluted 10 to 15 times with water and used for treating fly ash, the amount of the used sample was 2.0% of the mass of fly ash, and cement having 8 to 10% of the mass of fly ash was prepared during chelating, so as to improve the chelating effect. The test results are shown in table 1 below:
table 1: results for sample treatment fly ash:
in the preparation process of the sample, the homogeneous and consistent yellow or turquoise transparent liquid is obtained, and when the sample is mixed with cement, the agglomeration phenomenon is avoided, and the binding of a chelating device is few; meanwhile, according to the regulations in GB18485-2014 standards for controlling domestic waste incineration pollution (promulgated letters): mercury and its compounds (in Hg) not higher than 0.05mg/m3Cadmium, thallium and compounds thereof (in terms of Cd + Tl) not higher than 0.1 mg/m3Antimony, arsenic, lead, chromium, cobalt, copper, manganese, nickel and compounds thereof (calculated As Sb + As + Pb + Cr + Co + Cu + Mn + Ni) not higher than 1.0 mg/m3. The mercury and the compounds thereof in the sample are all less than 0.0002 mg/L, the total content of cadmium, thallium and the compounds thereof is less than 0.003 mg/L, the total content of antimony, arsenic, lead, chromium, cobalt, copper, manganese, nickel and the compounds thereof is less than 0.1 mg/L,meets the standard of the national standard GB 18485-2014. Therefore, the composite chelating agent can effectively stabilize almost all heavy metal ions in the fly ash for a long time, so that the fly ash reaches the standard landfill standard.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A chelating agent characterized by: the preparation method comprises the following steps:
firstly, selecting the following raw materials in percentage by weight: 10-60% of organic sulfide, 1-30% of inorganic sulfide, 1-20% of inorganic phosphide and 1-30% of organic low-molecular-weight dispersant;
secondly, adding the organic sulfide into water with the proportion of 1:5, stirring until the organic sulfide is completely dissolved, and filtering to obtain a clear solution;
thirdly, adding inorganic sulfide into the clarified solution, and stirring until the inorganic sulfide is completely dissolved to obtain a mixed clarified solution;
and fourthly, adding the organic low molecular weight dispersant into the mixed clarified solution, adding the inorganic phosphide after stirring, and fully stirring to obtain the multi-component composite chelating agent.
2. The chelating agent of claim 1, wherein: the organic sulfide is one of dimethyl dithiocarbamate and diethyl dithiocarbamate; the inorganic sulfide is one or a mixture of two of sodium sulfide and sodium thiosulfate; the inorganic phosphate is one of disodium hydrogen phosphate, sodium pyrophosphite and sodium dihydrogen phosphate; the organic low molecular weight dispersant is any one of ammonium polyacrylate, polyacrylamide, sodium polyacrylate and potassium polyacrylate.
3. A chelating agent as claimed in claim 2, wherein: the preparation method comprises the following steps:
firstly, adding 50g of sodium dimethyldithiocarbamate into 50g of water, stirring until the sodium dimethyldithiocarbamate is completely dissolved, and filtering to obtain a clear solution;
secondly, adding 15g of sodium thiosulfate into the clear solution, and stirring until the sodium thiosulfate is completely dissolved to obtain a mixed clear solution;
and thirdly, adding 30g of polyacrylamide with the molecular weight lower than 2000 into the mixed clarified solution, stirring, adding 10g of disodium hydrogen phosphate, and fully stirring to obtain the multi-component composite chelating agent.
4. A chelating agent as claimed in claim 2, wherein: the raw materials are prepared according to the following weight percentage: 35.0g of sodium dimethyldithiocarbamate, 5g of disodium hydrogen phosphate, 5g of sodium thiosulfate, 15g of polyacrylamide and 50.0g of water.
5. A chelating agent as claimed in claim 2, wherein: the raw materials are prepared according to the following weight percentage: 49.5g of sodium dimethyldithiocarbamate, 10.0g of disodium hydrogen phosphate, 15.2g of sodium thiosulfate, 28g of polyacrylamide and 50.0g of water.
6. A chelating agent as claimed in claim 2, wherein: the raw materials are prepared according to the following weight percentage: 47.0g of sodium dimethyldithiocarbamate, 9.5g of disodium hydrogen phosphate, 13g of sodium thiosulfate, 29g of polyacrylamide and 50.0g of water.
7. A chelating agent as claimed in claim 2, wherein: the raw materials are prepared according to the following weight percentage: 45.5g of sodium diethyldithiocarbamate, 8g of sodium pyrophosphite, 10g of sodium sulfide, 25g of sodium polyacrylate and 50.0g of water.
8. A chelating agent as claimed in claim 2, wherein: the raw materials are prepared according to the following weight percentage: 40g of sodium diethyldithiocarbamate, 7g of sodium pyrophosphite, 6g of sodium sulfide, 20g of sodium polyacrylate and 50.0g of water.
9. A chelating agent as claimed in claim 2, wherein: the raw materials are prepared according to the following weight percentage: 26g of sodium dimethyldithiocarbamate, 18g of sodium diethyldithiocarbamate, 9g of sodium pyrophosphite, 8g of sodium sulfide, 23g of sodium polyacrylate and 50.0g of water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010571045X | 2020-06-22 | ||
| CN202010571045.XA CN111617429A (en) | 2020-06-22 | 2020-06-22 | Multi-element composite chelating agent for fly ash treatment and preparation method thereof |
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| CN112402889A true CN112402889A (en) | 2021-02-26 |
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| CN202010571045.XA Pending CN111617429A (en) | 2020-06-22 | 2020-06-22 | Multi-element composite chelating agent for fly ash treatment and preparation method thereof |
| CN202110052142.2A Withdrawn CN112402889A (en) | 2020-06-22 | 2021-01-15 | Chelating agent |
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Families Citing this family (6)
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| CN112316352A (en) * | 2020-09-08 | 2021-02-05 | 馆陶县晴美环保科技有限公司 | Composition for solidifying waste incineration fly ash and preparation method and application thereof |
| CN112624726A (en) * | 2020-12-03 | 2021-04-09 | 嘉兴沃特泰科环保科技股份有限公司 | Liquid mixed chelating agent for hazardous waste landfill standard and preparation method thereof |
| CN112661480A (en) * | 2020-12-03 | 2021-04-16 | 嘉兴沃特泰科环保科技股份有限公司 | Solid chelating agent for life landfill standard and preparation method thereof |
| CN112608088B (en) * | 2020-12-31 | 2022-04-05 | 同济大学 | Geopolymer grouting material based on incineration fly ash and preparation method thereof |
| CN113679998A (en) * | 2021-08-25 | 2021-11-23 | 黄书友 | Chelating agent applied to fly ash treatment, application and preparation method thereof |
| CN114618114A (en) * | 2022-04-15 | 2022-06-14 | 安徽理工大学 | Method for stabilizing heavy metals in waste incineration fly ash based on landfill leachate |
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