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A kind of method for stabilizing treatment of arsenic alkali residue

A technology for stabilization treatment and arsenic-alkali slag, which is applied in the direction of improving process efficiency, can solve the problems of safe landfill disposal without arsenic-alkali slag, restricting process use, and high treatment costs, so as to achieve low cost of chemicals and reduce bioavailability , The effect of simple processing technology

Active Publication Date: 2016-08-24
POWERCHINA ZHONGNAN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such processes need to dissolve arsenic-alkali slag in a large amount of water, and direct discharge will bring huge pollution to the environment. Advanced treatment is required to meet the discharge standards. The high cost of treatment restricts the use of this type of process.
However, there is currently no technology for safe landfill disposal of high-concentration, high-alkalinity arsenic-alkali slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 500g of arsenic-alkali slag, add 150g of ferrous sulfate heptahydrate, that is, add according to the iron:arsenic molar ratio of 2:1, and stir for 10 minutes. Then, 75mL of dilute sulfuric acid with a concentration of 50% by mass was added, that is, the liquid-solid ratio was 1.5:10, and stirred for 10 minutes. Finally, it was placed at room temperature for 1 day and then the arsenic leaching concentration was measured. The test results showed that the leaching concentration of arsenic decreased from the original 4053mg / L to 0.88mg / L after treatment, meeting the requirements for entering hazardous waste landfills.

Embodiment 2

[0031] Take 500g of arsenic-alkali slag, add 144g of ferric chloride hexahydrate, that is, add according to the iron:arsenic molar ratio of 2:1, and stir for 10 minutes. Then add 50g of clay and stir for 10min. Then, add 100 mL of dilute sulfuric acid with a mass percentage concentration of 30%, that is, the liquid-solid ratio is 2:10, and stir for 10 min. Finally, it was placed at room temperature for 1 day and then the arsenic leaching concentration was measured. The test results showed that the leaching concentration of arsenic decreased from the original 4053mg / L to 0.64mg / L after treatment, meeting the requirements for entering hazardous waste landfills.

Embodiment 3

[0033] Take 200kg of arsenic-alkali slag, add 60kg of ferrous sulfate heptahydrate, that is, add according to the iron:arsenic molar ratio of 2:1, and stir for 20 minutes. Then, 30L of dilute sulfuric acid with a concentration of 50% by mass was added, that is, the liquid-solid ratio was 1.5:10, and stirred for 20 minutes. Finally, leave it at room temperature for 3 days and then measure the arsenic leaching concentration. The test results showed that the leaching concentration of arsenic was reduced from the original 4231mg / L to 0.36mg / L after treatment, meeting the requirements for entering hazardous waste landfills.

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Abstract

The invention discloses a new method for treating the arsenic-alkali slag. The method comprises the following steps: first crushing the arsenic-alkali slag, adding a stabilizer iron salt to the arsenic-alkali slag, and stirring evenly; Natural conservation. The invention solves the problem that the existing high-concentration arsenic-alkali slag (pH>12) pollutes or poses a potential threat to the environment, and reduces the leaching toxicity of the arsenic-alkali slag to the requirement for entering a hazardous waste landfill. The invention has simple process, readily available raw materials, low disposal cost and good application prospect.

Description

technical field [0001] The invention belongs to the technical field of remediation of soil heavy metal pollution. The invention relates to a method for stabilizing arsenic-alkali slag. Background technique [0002] Most antimony ores in my country contain arsenic. During the antimony smelting and refining process, the arsenic-removing scum produced by adding soda ash to remove arsenic and the secondary arsenic-alkali slag produced by its reduction are collectively referred to as arsenic-alkali slag (pH>12). The arsenic-alkali slag produced by this smelting process has high alkalinity, high total concentration of arsenic and high leaching toxicity, and is a kind of hazardous waste that is very difficult to dispose of. The average content of arsenic in arsenic-alkali slag is 1%-20%, and its main components are sodium arsenate, sodium antimonate and sodium carbonate. Since the arsenic in the arsenic-alkali slag exists in the form of sodium arsenate, which is highly toxic a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04
CPCY02P10/20
Inventor 李勇杜成琼陈湘斌马秒郭沨吴霞陆晓华王玲琳王鑫黎慧娟
Owner POWERCHINA ZHONGNAN ENG
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