A kind of agent for stabilization and solidification of high-concentration arsenic alkali residue

A technology for stabilizing arsenic-alkali slag, which is applied in the field of stabilized and solidified combination agents and arsenic-alkali slag stabilizing and curing agents. The effect is good, the steps are simplified, and the effect of promoting precipitation

Active Publication Date: 2019-07-12
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 at a molar ratio of 2:1 to prepare an oxidant;

[0031] Stabilizer preparation: Mix ferrous sulfate heptahydrate and polyferric sulfate according to the mass ratio of 5:1 to form the stabilizer;

[0032] Conditioner preparation: mix 15% red mud, 78% kaolin or attapulgite, and 7% fly ash, and pass through a 100-mesh sieve to obtain conditioner powder; thermal activation treatment of the conditioner: roast the obtained conditioner powder, The calcination temperature is 630°C, the calcination time is 60min, and it can be used after cooling.

Embodiment 2

[0034] The medicament in Example 1 was used for arsenic-alkali slag treatment.

[0035] Take 500g of arsenic pollution concentration of 21520mg / kg arsenic-alkali slag, add 1.5% oxidant and stir for 10min, then add 15% stabilizer and stir for 10min, finally add 10% conditioner and stir for 10min, then maintain at room temperature for 5d, measure the arsenic leaching concentration . The water immersion concentration of arsenic dropped from 1950mg / L before treatment to 0.93mg / L after treatment. The water immersion concentration of arsenic in the treated arsenic-alkali slag is lower than the control limit of hazardous waste allowed to enter the landfill area in the "Hazardous Waste Landfill Pollution Control Standard" (GB18598-2001), which is less than 2.5mg / L.

Embodiment 3

[0037] The medicament in Example 1 was used for arsenic-alkali slag treatment.

[0038]Take 500g of arsenic pollution concentration of 30550mg / kg arsenic-alkali slag, add 2% oxidant and stir for 15min, then add 20% stabilizer and stir for 15min, finally add 12% conditioner and stir for 15min, then maintain at room temperature for 7d, measure the concentration of arsenic leaching . The water immersion concentration of arsenic dropped from 2625mg / L before treatment to 1.53mg / L after treatment. The water immersion concentration of arsenic in the treated arsenic-alkali slag is lower than the control limit of hazardous waste allowed to enter the landfill area in the "Hazardous Waste Landfill Pollution Control Standard" (GB18598-2001), which is 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 agent for stabilizing and curing arsenic-alkali slag, in particular to a combined agent for stabilizing and curing high-concentration arsenic-alkali slag, which belongs to the technical field of waste arsenic-alkali slag treatment. Background technique [0002] Arsenic-alkali slag is the waste residue produced when adding soda ash to remove arsenic during the crude antimony refining process. The arsenic content in the slag is 5% to 7%, and the arsenic mainly exists in the form of sodium arsenate, which is highly toxic and easily 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 slag leaks, the arsenic exposed to the environment will enter the water body and the food chain, endangering human health in the slightest and causing death in severe cases. At present, the treatment methods of arsenic-alkali slag at home and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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