Method for achieving stabilized solidification of high-concentration arsenic soda slag

An arsenic-alkali slag and stabilization technology is applied in the field of stabilization and solidification of arsenic-alkali slag and high-concentration arsenic-alkali slag. To achieve good removal effect, simplify steps, and promote the effect of precipitation

Active Publication Date: 2017-02-22
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

[0031] 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;

[0032] Stabilizer preparation: Mix ferrous sulfate heptahydrate and polyferric sulfate according to the mass ratio of 5:1 to form the stabilizer;

[0033] 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

[0035] The medicament in Example 1 was used for arsenic-alkali slag treatment.

[0036] 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 less than 2.5mg / L, which is lower than the control limit value for the hazardous waste allowed to enter the landfill area in the "Hazardous Waste Landfill Pollution Control Standard" (GB18598-2001).

Embodiment 3

[0038] The medicament in Example 1 was used for arsenic-alkali slag treatment.

[0039] Take 500g of arsenic-alkali slag 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, finally add 12% conditioner and stir for 15 minutes, then maintain at room temperature for 7 days, and 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 less than 2.5mg / L, which is lower than the control limit value for the hazardous waste allowed to enter the landfill area in the "Hazardous Waste Landfill Pollution Control Standard" (GB18598-2001).

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Abstract

The invention discloses a method for achieving stabilized solidification of high-concentration arsenic soda slag. The method comprises the steps that the arsenic soda slag is crushed into arsenic soda slag particles; an oxidizing agent composed of hydrogen peroxide and persulfate is added into the arsenic soda slag firstly and stirred evenly; then a stabilizing agent composed of ferric salt and / or ferrous salt is added into the arsenic soda slag and stirred evenly; and finally, a conditioner composed of red mud, coal ash, kaolin and / or attapulgite is added and stirred evenly, and maintenance is conducted. According to the method, by the adoption of the stabilizing agent, the synergistic interaction for solidifying components of reagents is remarkable, high-efficient stabilized solidification of the high-concentration arsenic soda slag can be achieved, and the method is easy to implement, low in cost and suitable for application and popularization.

Description

technical field [0001] The invention relates to a method for stabilizing and solidifying arsenic-alkali slag, in particular to a method for stabilizing and solidifying high-concentration arsenic-alkali slag by using a compound agent, and 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...

Claims

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Application Information

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IPC IPC(8): A62D3/38A62D101/43
CPCA62D3/38A62D2101/43
Inventor 韩凤史学峰邵乐刘晓月李娟李昌武丁旺李鹏刘卫国
Owner AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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