CN114404861A - Fly ash chelating agent and preparation method thereof - Google Patents
Fly ash chelating agent and preparation method thereof Download PDFInfo
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- CN114404861A CN114404861A CN202210130177.8A CN202210130177A CN114404861A CN 114404861 A CN114404861 A CN 114404861A CN 202210130177 A CN202210130177 A CN 202210130177A CN 114404861 A CN114404861 A CN 114404861A
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- chelating agent
- fly ash
- additive
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- 239000002738 chelating agent Substances 0.000 title claims abstract description 29
- 239000010881 fly ash Substances 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- DKVNPHBNOWQYFE-UHFFFAOYSA-N carbamodithioic acid Chemical compound NC(S)=S DKVNPHBNOWQYFE-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000012990 dithiocarbamate Substances 0.000 claims abstract description 17
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 16
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 16
- 239000011575 calcium Substances 0.000 claims abstract description 16
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 16
- 239000005077 polysulfide Substances 0.000 claims abstract description 16
- 229920001021 polysulfide Polymers 0.000 claims abstract description 16
- 150000008117 polysulfides Polymers 0.000 claims abstract description 16
- 239000011734 sodium Substances 0.000 claims abstract description 16
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims abstract description 14
- LTVDFSLWFKLJDQ-UHFFFAOYSA-N α-tocopherolquinone Chemical compound CC(C)CCCC(C)CCCC(C)CCCC(C)(O)CCC1=C(C)C(=O)C(C)=C(C)C1=O LTVDFSLWFKLJDQ-UHFFFAOYSA-N 0.000 claims abstract description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 13
- 239000000654 additive Substances 0.000 claims abstract description 13
- 230000000996 additive effect Effects 0.000 claims abstract description 13
- 239000011259 mixed solution Substances 0.000 claims abstract description 7
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 3
- 239000003352 sequestering agent Substances 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 claims description 2
- 239000013522 chelant Substances 0.000 claims 1
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 15
- 230000001988 toxicity Effects 0.000 abstract description 4
- 231100000419 toxicity Toxicity 0.000 abstract description 4
- 238000005189 flocculation Methods 0.000 abstract description 3
- 230000016615 flocculation Effects 0.000 abstract description 3
- 150000002898 organic sulfur compounds Chemical class 0.000 abstract description 3
- 231100000252 nontoxic Toxicity 0.000 abstract 1
- 230000003000 nontoxic effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 238000005303 weighing Methods 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 239000013043 chemical agent Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000002386 leaching Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000004056 waste incineration Methods 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000010791 domestic waste Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000012633 leachable Substances 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
- A62D2101/08—Toxic combustion residues, e.g. toxic substances contained in fly ash from waste incineration
-
- 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
Landscapes
- 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 provides a fly ash chelating agent and a preparation method thereof. The fly ash chelating agent comprises the following components: according to weight percentage, 5 to 8 percent of 0, 0-diisopropyl ammonium dithiophosphate, 3 to 7 percent of 2, 3-dithiosuccinic acid, 10 to 20 percent of 3-chlorine-2-hydroxypropyl trimethyl ammonium chloride, 2 to 4 percent of sodium trimethyl dithiocarbamate, 3 to 7 percent of calcium polysulfide, 0.3 to 0.7 percent of additive and 60 to 70 percent of water. The preparation method of the fly ash chelating agent comprises the following steps: adding 0, 0-diisopropyl ammonium dithiophosphate, 2, 3-dithiosuccinic acid, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, sodium trimethyl dithiocarbamate and calcium polysulfide into water, stirring to obtain a mixed solution, adding an additive, and stirring. The preparation method is very simple, and the organic sulfur compound chelating agent has the advantages of large molecular weight, strong flocculation function and strong heavy metal chelating capacity; the additive of the chelating agent is polyaluminium chloride, so that the chelating capacity of the chelating agent is improved, the toxicity of the heavy metal chelating agent is reduced, and the product and the preparation process are environment-friendly, safe and nontoxic.
Description
Technical Field
The invention relates to the technical field of chelating agents, in particular to a liquid mixed chelating agent for hazardous waste landfill standards and a preparation method thereof.
Background
The garbage incineration can generate fly ash while realizing reduction treatment of the domestic garbage. The fly ash generated by burning the household garbage has complex components, and the main pollutants are heavy metals with high leaching toxicity and have serious harm to the environment. Through detection, the fly ash from the incineration of the household garbage contains heavy metals with high leaching concentration, such as Pb, Cr, Cd, Cu, Hg, Zn and the like. At present, the main technical methods for treating fly ash in the domestic waste incineration industry are mainly three, one is to adopt a cement curing technology to cure heavy metals, and the heavy metals react with hydrated cement through ion exchange, passivation, adsorption, chemical adsorption, sedimentation, and finally form more stable compounds such as hydroxide or complex compounds on the surface of hydrated silicate colloid C-H-S of the cement, but the method has the defects of weak integration capability, poor stability, weak adaptability to different types of fly ash, large fly ash capacity and large landfill volume; secondly, a melting solidification method, which is the most safe and stable incineration fly ash stabilization solidification technology recognized at present, mainly comprises the steps of mixing, granulating and molding the incineration fly ash and glass powder, and melting for a period of time at the high temperature of 1000-1400 ℃, but the method has the defect of high energy consumption; thirdly, chemical agent stabilizing method, chemical agent converts its ion into low solubility, low mobility macromolecule complex or inorganic mineral substance through chemical reaction with heavy metal, its core lies in the choice of chemical integrating agent, especially the selectivity of chemical agent to mainly pollute heavy metal ion, and the stability of generated complex, especially the leachability to acidic solution; in the related technology, the adopted chelating agent is mostly a DTC chelating agent (dithiocarbamate is DTC for short), belongs to a non-high molecular compound, contains few complexing centers in unit molecular weight, and has high leachable concentration with a complex generated by heavy metal. Therefore, there is a need to provide a new process to solve the above technical problems.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a fly ash chelating agent and a preparation method thereof.
The purpose of the invention can be achieved by adopting the following technical scheme:
a fly ash sequestrant comprising the following ingredients:
the weight percentage is as follows: 5 to 8 percent of 0, 0-diisopropyl ammonium dithiophosphate, 3 to 7 percent of 2, 3-dithiosuccinic acid, 10 to 20 percent of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, 2 to 4 percent of sodium trimethyl dithiocarbamate, 3 to 7 percent of calcium polysulfide, 0.3 to 0.7 percent of additive and 60 to 70 percent of water.
Preferably, the weight percentage is 5 percent to 8 percent of 0, 0-diisopropyl ammonium dithiophosphate, 3 percent to 7 percent of 2, 3-dithiosuccinic acid, 10 percent to 20 percent of 3-chlorine-2-hydroxypropyl trimethyl ammonium chloride, 2 percent to 4 percent of sodium trimethyl dithiocarbamate, 3 percent to 7 percent of calcium polysulfide, 0.3 percent to 0.7 percent of additive and 60 percent to 70 percent of water.
Preferably, the additive is polyaluminum chloride, and the water is deionized water. The preparation method of the fly ash chelating agent is characterized by comprising the following steps:
step A, adding 0, 0-diisopropyl ammonium dithiophosphate, 2, 3-dithiosuccinic acid, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, sodium trimethyl dithiocarbamate and calcium polysulfide into water, and stirring for 0.5 hour to obtain a mixed solution.
And B: and D, adding an additive into the mixed liquid obtained in the step A, and stirring for 1 hour to obtain the fly ash chelating agent.
Compared with the prior art, the invention has the following beneficial effects:
1. provides a novel heavy metal chelating agent, namely an organic sulfur compound chelating agent, which has the advantages of large molecular weight, strong flocculation function and strong heavy metal chelating capacity.
2. The additive of the chelating agent is polyaluminium chloride, so that the chelating capacity of the chelating agent is improved, the toxicity of the high-molecular heavy metal chelating agent is reduced, and the modified product is easy to biodegrade.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, a fly ash chelating agent and a method for preparing the same are further described in detail below with reference to examples.
Example 1:
weighing 60kg of deionized water, 3kg of 0, 0-diisopropyl ammonium dithiophosphate, 1.8kg of 2, 3-dithiosuccinic acid, 6kg of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, 1.2kg of sodium trimethyl dithiocarbamate, 1.8kg of calcium polysulfide and 0.18kg of polyaluminium chloride, firstly adding 0, 0-diisopropyl ammonium dithiophosphate, 2, 3-dithiosuccinic acid, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, sodium trimethyl dithiocarbamate and calcium polysulfide into the deionized water, and stirring for 0.5 hour to obtain a mixed solution; then adding polyaluminium chloride and stirring for 1 hour.
Example 2:
weighing 60kg of deionized water, 3.6kg of 0, 0-diisopropyl ammonium dithiophosphate, 2.4kg of 2, 3-dithiosuccinic acid, 9kg of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, 1.5kg of sodium trimethyl dithiocarbamate, 2.4kg of calcium polysulfide and 0.24kg of polyaluminium chloride, firstly adding 0, 0-diisopropyl ammonium dithiophosphate, 2, 3-dithiosuccinic acid, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, sodium trimethyl dithiocarbamate and calcium polysulfide into the deionized water, and stirring for 0.5 hour to obtain a mixed solution; then adding polyaluminium chloride and stirring for 1 hour.
Example 3:
weighing 60kg of deionized water, 4.2kg of 0, 0-diisopropyl ammonium dithiophosphate, 3.0kg of 2, 3-dithiosuccinic acid, 10.8kg of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, 1.8kg of sodium trimethyl dithiocarbamate, 3.0kg of calcium polysulfide and 0.30kg of polyaluminium chloride, firstly adding 0, 0-diisopropyl ammonium dithiophosphate, 2, 3-dithiosuccinic acid, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, sodium trimethyl dithiocarbamate and calcium polysulfide into the deionized water, and stirring for 0.5 hour to obtain a mixed solution; then adding polyaluminium chloride and stirring for 1 hour.
Example 4:
weighing 65kg of deionized water, 5.2kg of 0, 0-diisopropyl ammonium dithiophosphate, 4.5kg of 2, 3-dithiosuccinic acid, 13kg of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, 2.6kg of sodium trimethyl dithiocarbamate, 4.5kg of calcium polysulfide and 0.45kg of polyaluminium chloride, firstly adding 0, 0-diisopropyl ammonium dithiophosphate, 2, 3-dithiosuccinic acid, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, sodium trimethyl dithiocarbamate and calcium polysulfide into the deionized water, and stirring for 0.5 hour to obtain a mixed solution; then adding polyaluminium chloride and stirring for 1 hour.
Example 5:
the fly ash of a certain waste incineration power plant is used as an experimental object, the examples 1-4 are tested, and after the chelating agents of all groups fully react with the fly ash, the leaching concentration of heavy metal ions is measured as follows:
in conclusion, the preparation method is very simple, is an organic sulfur compound chelating agent, and has the advantages of large molecular weight, strong flocculation function and strong heavy metal chelating capacity; the additive of the chelating agent is polyaluminium chloride, so that the chelating capacity of the chelating agent is improved, and the toxicity of the high-molecular heavy metal chelating agent is reduced.
Claims (4)
1. A fly ash sequestrant comprising the following ingredients:
the weight percentage is as follows: 5 to 8 percent of 0, 0-diisopropyl ammonium dithiophosphate, 3 to 7 percent of 2, 3-dithiosuccinic acid, 10 to 20 percent of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, 2 to 4 percent of sodium trimethyl dithiocarbamate, 3 to 7 percent of calcium polysulfide, 0.3 to 0.7 percent of additive and 60 to 70 percent of water.
2. A fly ash chelant according to claim 1, wherein the weight percentages are: 3 to 6 percent of 0, 0-diisopropyl ammonium dithiophosphate, 5 to 7 percent of 2, 3-dithiosuccinic acid, 10 to 15 percent of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, 2 to 4 percent of sodium trimethyl dithiocarbamate, 3 to 7 percent of calcium polysulfide, 0.3 to 0.7 percent of additive and 60 to 70 percent of water.
3. A fly ash sequestrant according to claim 1, wherein the additive is polyaluminium chloride and the water is deionized water.
4. The preparation method of the fly ash chelating agent is characterized by comprising the following steps:
step A, adding 0, 0-diisopropyl ammonium dithiophosphate, 2, 3-dithiosuccinic acid, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, sodium trimethyl dithiocarbamate and calcium polysulfide into water, and stirring for 0.5 hour to obtain a mixed solution;
and B: and D, adding an additive into the mixed liquid obtained in the step A, and stirring for 1 hour to obtain the fly ash chelating agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210130177.8A CN114404861A (en) | 2022-02-11 | 2022-02-11 | Fly ash chelating agent and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210130177.8A CN114404861A (en) | 2022-02-11 | 2022-02-11 | Fly ash chelating agent and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114404861A true CN114404861A (en) | 2022-04-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210130177.8A Pending CN114404861A (en) | 2022-02-11 | 2022-02-11 | Fly ash chelating agent and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114404861A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101176815A (en) * | 2007-11-15 | 2008-05-14 | 河海大学 | Method for stabilization processing refuse incineration flying ash |
| CN106955451A (en) * | 2017-02-27 | 2017-07-18 | 湖南云平环保科技有限公司 | Incineration of refuse flyash heavy metal chelant and preparation method thereof |
| CN108014444A (en) * | 2018-01-24 | 2018-05-11 | 东莞市升佳净水材料有限公司 | A kind of flying dust chelating agent and preparation method thereof |
-
2022
- 2022-02-11 CN CN202210130177.8A patent/CN114404861A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101176815A (en) * | 2007-11-15 | 2008-05-14 | 河海大学 | Method for stabilization processing refuse incineration flying ash |
| CN106955451A (en) * | 2017-02-27 | 2017-07-18 | 湖南云平环保科技有限公司 | Incineration of refuse flyash heavy metal chelant and preparation method thereof |
| CN108014444A (en) * | 2018-01-24 | 2018-05-11 | 东莞市升佳净水材料有限公司 | A kind of flying dust chelating agent and preparation method thereof |
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Application publication date: 20220429 |