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Heavy metal chelating agent for waste incineration fly ash and preparation method of chelating agent

A technology of heavy metal chelating agent and waste incineration fly ash, which is applied in the direction of protection device against harmful chemical agents, etc., can solve the problems of reducing the chelating stability of the chelating agent, easily separating out heavy metal ions, and poor chelating performance of hydroxycarboxylic acid, etc. Achieve the effect of limiting the migration and leaching of heavy metals, reducing the permeability coefficient, and improving the chelation effect

Inactive Publication Date: 2021-08-24
深圳市泰美瑞环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, inorganic phosphates will pollute the environment, especially waters; aminocarboxylic acids and carboxylic acid-containing polymers have extremely poor biodegradability after chelating metals, and will also cause damage to the environment; hydroxycarboxylic acids have poor chelating performance ; The chelating performance of carbamodithioformate is strong, but the flocs formed are small and the settling performance is poor. It is necessary to maintain an appropriate excess to achieve better results, and carbamodithioformate contains sulfur, which will The environment brings secondary pollution
[0005] Publication number is the patent of CN109091792A, discloses a kind of fly ash chelating agent, is formed by mixing organic phosphonic acid, hydroxycarboxylic acid, dithiocarboxylate and alkali solution, has improved the scope of use and removal rate of chelating agent, but The chelate formed by the chelating agent and heavy metals is easy to precipitate heavy metal ions in a strong acid environment, which reduces the chelating stability of the chelating agent

Method used

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  • Heavy metal chelating agent for waste incineration fly ash and preparation method of chelating agent
  • Heavy metal chelating agent for waste incineration fly ash and preparation method of chelating agent
  • Heavy metal chelating agent for waste incineration fly ash and preparation method of chelating agent

Examples

Experimental program
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Effect test

preparation example 1

[0040] Preparation examples 1-5 provide a cross-linked carboxymethyl starch, and preparation example 1 is taken as an example for illustration below.

[0041] The cross-linked carboxymethyl starch that preparation example 1 provides, its preparation steps are:

[0042] S1. Take 200g of cross-linked starch and add it to 500mL of ethanol, stir and dissolve completely, then add dropwise 50mL of sodium hydroxide aqueous solution with a concentration of 2mol / L, and after the dropwise addition is complete, perform an alkalization reaction at 30°C for 2 hours;

[0043] S2. Add 800 g of chloroacetic acid ethanol solution with a mass fraction of 15 wt % to the reaction solution obtained in the step S1, etherify at 70° C. for 4 h, and adjust the pH of the reaction solution to 7 with 0.1 mol / L hydrochloric acid after the etherification is completed. Suction filtration, washing the upper layer solid with absolute ethanol until there is no chloride ion in the filtrate, and drying at 60°C t...

preparation example 6

[0051] Preparation examples 6-17 provide a cross-linked starch-grafted polyacrylamide, and preparation example 6 is taken as an example to illustrate below.

[0052] The cross-linked starch grafted polyacrylamide that preparation example 6 provides, its preparation steps are:

[0053] (1) 200g of cross-linked starch was gelatinized at 70°C for 4 hours, cooled to 40°C, 0.3g of initiator was added, and 400g of acrylamide monomer was added. 2 Under the atmosphere, react at 40°C for 3 hours, wash with absolute ethanol after the reaction until no white viscous substance is precipitated in the reaction solution, and the crude product is obtained;

[0054] (2) adding the crude product obtained in the step (1) into acetone, extracting and removing the acrylamide homopolymer by reflux, and drying at 60° C. to obtain cross-linked starch-grafted polyacrylamide;

[0055] Wherein, the model of the cross-linked starch is HX-88;

[0056] The initiator is potassium persulfate.

[0057] Pre...

preparation example 8、11-12

[0061] The quality of table 4 preparation example 8,11-12 acrylamide monomer and initiator

[0062] Preparation example Preparation example 8 Preparation Example 11 Preparation Example 12 Initiator 0.3g 0.4g 0.35g Acrylamide Monomer 400g 600g 500g

[0063] Preparation Examples 13-17 differ from Preparation Example 12 only in that the type and source of the cross-linked starch are different, see Table 5 for details.

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Abstract

The invention belongs to the technical field of waste fly ash treatment, and particularly relates to a chelating agent for waste incineration fly ash and a preparation method of the chelating agent. The heavy metal chelating agent for the waste incineration fly ash is prepared from the following raw materials in parts by weight: 20 to 40 parts of crosslinked starch grafted polyacrylamide, 20 to 30 parts of tetrasodium glutamate diacetate, 10 to 20 parts of methylglycine diacetic acid, 5 to 10 parts of citric acid, 3 to 5 parts of isopropanolamide, 5 to 10 parts of a dispersing agent and 30 to 50 parts of deionized water. The prepared heavy metal chelating agent for the waste incineration fly ash is good in chelating effect, a chelate generated by the chelating agent and heavy metal is good in stability, heavy metal ions are not prone to be separated out when the chelate is placed in strong acid for a long time, and meanwhile the chelate is very stable when the chelate is placed in the natural environment for a long time.

Description

technical field [0001] The application belongs to the technical field of waste fly ash treatment, and more specifically, the application relates to a heavy metal chelating agent for waste incineration fly ash and a preparation method thereof. Background technique [0002] Waste incineration can effectively realize waste reduction, harmlessness and recycling, but secondary pollution is inevitable. The fly ash produced in the waste incineration process is 2% to 5% of the total waste incinerated. It is enriched with heavy metals such as Cd, Pb, Zn, Ni with high concentration and large fluctuations, and persistent organic pollutants such as dioxins. things. [0003] The heavy metals in fly ash mainly come from fabrics, plastics, dust, dry paper, etc., which belong to the category of dry waste entering the furnace. The content of heavy metals in kitchen waste wet waste is relatively small. After the implementation of waste classification, although it can reduce the amount of inc...

Claims

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Application Information

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IPC IPC(8): A62D3/33C08F251/00C08F220/56A62D101/08A62D101/43A62D101/47
CPCA62D3/33A62D2101/08A62D2101/43A62D2101/47C08F251/00C08F220/56
Inventor 不公告发明人
Owner 深圳市泰美瑞环保科技有限公司
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