Stabilization and solidification agent for high-concentration arsenic alkali residues

An arsenic-alkali slag and stabilization technology, which is applied in the field of stabilized and solidified combination agents and arsenic-alkali slag stabilized and solidified agents, can solve problems such as the instability of iron arsenate, low utilization of hydrogen peroxide, and increased arsenic concentration, and achieve improved Oxidation efficiency, good stability, strong oxidation ability

Active Publication Date: 2017-01-11
AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent (CN105597262A) discloses the use of H 2 o 2 , FeSO 4 ·7H 2 O, CaO and slag cement are used as stabilizing agents for arsenic-containing waste slag. Due to the strong alkalinity of arsenic-alkali slag in arsenic-containing waste slag, the utilization of hydrogen peroxide is low; especially the precipitation of iron arsenate salt formed by the reaction of arsenic and iron salt It is greatly affected by pH. Under the condition of pH>7, iron arsenate is unstable and decomposed. The ratio of CaO and slag cement in the patent solidification stabilizer is relatively high, and they are all strongly alkaline, resulting in iron arsenate The salt is broken down and the concentration of arsenic in the leachate increases
In addition, the Chinese patent (CN104263949A) uses iron salts and clay minerals to stabilize and solidify the arsenic-alkali slag, but after the arsenic-alkali slag is added with a stabilizer, a large amount of dilute acid is required to adjust the pH, which is costly and complicated to operate. Difficult to meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of oxidant: After diluting to 2% with commercially available 30% hydrogen peroxide, it is uniformly mixed with sodium persulfate in a molar ratio of 2:1 to configure an oxidant;

[0031] Stabilizer preparation: Mix ferrous sulfate heptahydrate and polymerized ferric sulfate in a mass ratio of 5:1 to form a stabilizer;

[0032] Preparation of conditioning agent: mixing 15% of red mud, 78% of kaolin or attapulgite, and 7% of fly ash, passing through a 100-mesh sieve to obtain conditioning agent powder; heat activation treatment of conditioning agent: roasting the obtained conditioning agent powder, The roasting temperature is 630℃, the roasting time is 60min, and it can be used after cooling.

Embodiment 2

[0034] The arsenic-alkali residue treatment was carried out using the reagents in Example 1.

[0035] Take 500g of arsenic alkali residue with an arsenic pollution concentration of 21520mg / kg, add 1.5% oxidant and stir for 10 minutes, then add 15% stabilizer and stir for 10 minutes, and finally add 10% conditioner and stir for 10 minutes. . The water leaching concentration of arsenic decreased from 1950mg / L before treatment to 0.93mg / L after treatment. The arsenic water leaching concentration in the treated arsenic-alkali residue is lower than the control limit for hazardous wastes allowed to enter the landfill area in the "Landfill Pollution Control Standard for Hazardous Waste" (GB18598-2001), less than 2.5mg / L.

Embodiment 3

[0037] The arsenic-alkali residue treatment was carried out using the reagents in Example 1.

[0038]Take 500g of arsenic alkali residue with an arsenic pollution concentration of 30550mg / kg, add 2% oxidant and stir for 15 minutes, then add 20% stabilizer and stir for 15 minutes, and finally add 12% conditioner and stir for 15 minutes. . The water leaching concentration of arsenic decreased from 2625mg / L before treatment to 1.53mg / L after treatment. The arsenic water leaching concentration in the treated arsenic-alkali residue is lower than the control limit for hazardous wastes allowed to enter the landfill area in the "Landfill Pollution Control Standard for Hazardous Waste" (GB18598-2001), less than 2.5mg / L.

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PUM

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Abstract

The invention discloses a stabilization and solidification agent for high-concentration arsenic alkali residues. The stabilization and solidification agent is composed of following components including an oxidizing agent composed of hydrogen peroxide and persulfate, a stabilizing agent composed of molysite and / or ferrite, and a conditioner composed of kaolin and / or attapulgite, red mud and pulverous coal. The synergistic interaction effect between all the components of the stabilization and solidification agent is obvious, efficient stabilization and solidification of the high-concentration arsenic alkali residues can be achieved, a method for using the agent is simple, cost is low, and the stabilization and solidification agent is suitable for application and popularization.

Description

technical field [0001] The invention relates to an arsenic-alkali slag stabilization and curing agent, in particular to a combination agent for the stabilization and solidification of high-concentration arsenic-alkali slag, and belongs to the technical field of waste arsenic slag treatment. Background technique [0002] Arsenic alkali residue is the waste residue produced when adding soda ash to remove arsenic in the refining process of crude antimony. The arsenic content of the residue is 5% to 7%, of which arsenic mainly exists in the form of sodium arsenate, which is highly toxic and soluble in water. , It is very easy to pollute the environment and is a kind of hazardous waste that is very difficult to dispose of. Once the arsenic-alkali residue is leaked, the arsenic exposed to the environment will enter the water body and food chain, which will endanger human health at light level and cause death at worst. At present, the main treatment methods for arsenic-alkali slag...

Claims

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Application Information

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IPC IPC(8): A62D3/33A62D101/43
CPCA62D3/33A62D2101/43
Inventor 韩凤李娟史学峰刘晓月邵乐刘杨万文祥李顺锋杨玉洁
Owner AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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