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Heavy metal stabilizing chelating agent, aqueous solution thereof and preparation methods thereof

A stabilization and chelating agent technology, applied in the field of broad-spectrum chelating agent and its preparation, can solve the problems of large differences in species and content, inability to meet long-term safety requirements for hazardous waste treatment, poor fly ash stabilization effect, etc. The effect of preventing leaching contamination

Active Publication Date: 2020-06-05
CPI YUANDA ENVIRONMENTAL PROTECTION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stabilization effect of inorganic chemicals on fly ash is poor, and the capacity of waste after treatment is small. However, when the environmental pH conditions change, heavy metals in waste will be leached due to leaching, which cannot meet the requirements of hazardous waste treatment. long-term security requirements
Organic chelating agents have a good chelating effect on heavy metals, but due to the large differences in the types and contents of the original heavy metal pollutants in fly ash
[0004] In addition, the disposal of water treatment sludge containing heavy metals and other substances containing heavy metals also has the same or similar problems as waste incineration fly ash

Method used

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  • Heavy metal stabilizing chelating agent, aqueous solution thereof and preparation methods thereof
  • Heavy metal stabilizing chelating agent, aqueous solution thereof and preparation methods thereof
  • Heavy metal stabilizing chelating agent, aqueous solution thereof and preparation methods thereof

Examples

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preparation example Construction

[0064] In yet another aspect, the present invention provides a kind of preparation method of above-mentioned heavy metal stabilizing chelating agent, comprises the following steps:

[0065] (1) dithiocarbamate, (2) sodium sulfide and / or sodium thiosulfate, (3) disodium hydrogen phosphate and / or sodium dihydrogen phosphate, (4) organic acid and (5) chlorine Mix ferrous chloride and / or ferrous sulfate evenly.

[0066] In the above preparation method, sodium sulfite may also be mixed therein.

[0067] In yet another aspect, the present invention provides a kind of aqueous solution preparation method of above-mentioned heavy metal stabilizing chelating agent, comprises the following steps:

[0068] preparing an aqueous solution of (1) dithiocarbamate, (2) sodium sulfide and / or sodium thiosulfate and (3) disodium hydrogen phosphate and / or sodium dihydrogen phosphate; and

[0069] (4) organic acid and (5) ferrous chloride and / or ferrous sulfate are added to the aqueous solution. ...

specific Embodiment approach

[0086] In order to further understand the present invention, the heavy metal stabilized chelating agent provided by the present invention and its preparation method are described in detail below in conjunction with the examples, and the protection scope of the present invention is not limited by the following examples.

[0087] In the following examples, the chemicals used were reagent grade. However, for industrial stabilization treatment of waste incineration fly ash or heavy metal sludge, industrial grade reagents can be used to reduce costs.

Embodiment 1

[0089] Mix 45 g of sodium dimethyl dithiocarbamate, 30 g of sodium sulfide, and 15 g of sodium dihydrogen phosphate evenly, dissolve in deionized water at 40° C., configure a 60% by weight solution, and stir for 20 minutes. Add 1 g of citric acid, 5 g of ferrous chloride and 4 g of sodium sulfite into the solution, and stir for 25 minutes to obtain chelating agent solution 1, whose pH is 6.8.

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Abstract

The invention provides a heavy metal stabilizing chelating agent, an aqueous solution thereof and a preparation method thereof. The heavy metal stabilizing chelating agent comprises dithiocarbamate; ferrous sulfate and / or ferrous chloride; organic acid which is selected from one or more of citric acid, malic acid, lactic acid and tartaric acid; sodium thiosulfate and / or sodium sulfide; and disodium hydrogen phosphate and / or sodium dihydrogen phosphate, and optionally sodium sulfite. The heavy metal stabilizing chelating agent can be used for treating waste incineration fly ash, water treatmentsludge containing heavy metals and other substances containing heavy metals, can form stable components with various heavy metals to prevent environmental migration and diffusion of the heavy metalsand prevent leaching pollution under natural conditions, and has a good heavy metal removal effect and high stabilizing efficiency.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a broad-spectrum chelating agent capable of stabilizing various heavy metals and a preparation method thereof. The invention is not only suitable for treating waste incineration fly ash, but also can be used for treating water treatment sludge containing heavy metals and other substances containing heavy metals. Background technique [0002] With the development of my country's social economy, the acceleration of urbanization and the improvement of people's material life, the national municipal solid waste removal volume has reached more than 200 million tons, and it is increasing at a rate of 8% to 10% per year. Municipal waste incineration is an important means of waste disposal in my country. During the incineration process, a large amount of fly ash will be produced. The output of fly ash is related to the type of waste, incineration conditions, type of incinerator and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/33C09K17/40B09B3/00C02F11/00C02F101/20A62D101/08A62D101/43
CPCA62D3/33A62D2101/08A62D2101/43B09B3/00C02F11/00C02F2101/20C09K17/40
Inventor 李国林孔岩范振兴罗丹刘志华
Owner CPI YUANDA ENVIRONMENTAL PROTECTION ENG
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