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Method for treating arsenic sulfide residue

A technology derived from arsenic sulfide, applied to the removal of solid waste, etc., can solve problems such as poor working environment, high recycling cost, and complicated process, and achieve the effects of reducing landfill costs, reducing leaching toxicity, and reducing volume expansion ratio

Active Publication Date: 2013-04-03
中节能大地(杭州)环境修复有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pyrochemical treatment of arsenic sulfide slag is a mature and short process, but the working environment is poor, which has a great impact on the health of workers and is likely to cause secondary pollution to the air
Wet treatment of arsenic sulfide slag produces no dust and low energy consumption, but the process is complicated and the recovery cost is high
And because there are many manufacturers of arsenic trioxide, the market competition is fierce, and the economic benefit is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 5g of polyferric sulfate and 10g of polyaluminum chloride, add them into 40g of water and stir. Add the uniformly stirred mixed solution into 200 g of arsenic sulfide slag, and stir for 0.5 hour. Next, add 50 g of iron powder and 20 g of light magnesium oxide mixed powder, and stir for 0.5 hours. Finally, add 40g of asbestos wool and stir for 0.5 hours. Put the stirred solid waste into a ziplock bag and place it at room temperature for 3 days. The test results of leaching toxicity showed that the leaching toxicity of arsenic was reduced from 800mg / L of raw mud to 1.78mg / L after treatment, meeting the requirements for entering hazardous waste landfill.

Embodiment 2

[0021] Weigh 5g of polyferric sulfate and 10g of polyaluminum chloride, add them into 40g of water and stir. Add the uniformly stirred mixed solution into 200 g of arsenic sulfide slag, and stir for 0.5 hour. Next, 60 g of iron powder was added and stirred for 0.5 hours. Finally, 30 g of asbestos wool was added and stirred for 0.5 hours. Put the stirred solid waste into a ziplock bag and place it at room temperature for 3 days. The test results of leaching toxicity showed that the leaching toxicity of arsenic was reduced from 800mg / L of the raw mud to 1.26mg / L after treatment, meeting the requirements for entering hazardous waste landfills.

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PUM

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Abstract

The invention discloses a novel method for treating arsenic sulfide residue, belonging to the field of the treatment of hazardous wastes. In allusion to the deficiencies of the existing curing drugs, such as large compatibilization ratio, difficult landfill and the like, the invention discloses a method for treating arsenic sulfide residue via a stabilization drug; and by means of the method, thestabilization drug can have complicated physical-chemical reaction with the arsenic sulfide residue so that the leaching toxicity of the arsenic is reduced to the inlet requirement of hazardous wastelandfill sites. The method comprises the following steps: adding inorganic flocculating agent solution in the arsenic sulfide residue and mixing evenly; adding a solid powder adsorbent and mixing evenly; and finally adding asbestos wool to mix. According to the method provided by the invention, the process flow is simple, the operability is strong, the effect is remarkable, and the method is suitable for the treatment of arsenic-containing hazardous wastes.

Description

technical field [0001] The invention relates to a treatment method for hazardous waste containing arsenic, in particular to a method for treatment of arsenic sulfide slag. Background technique [0002] In the chemical and metallurgical production process, the sulfide precipitation method is usually used to remove arsenic in the waste liquid to produce arsenic sulfide slag. Since the arsenic sulfide slag is difficult to detoxify and the amount is small, ordinary enterprises will adopt the method of hoarding and storing it. However, with the passage of time, the amount of arsenic sulfide slag piled up is increasing, so how to deal with these arsenic sulfide slags has become an unavoidable problem for enterprises. At present, solidification technology is commonly used at home and abroad to treat arsenic sulfide slag, but due to the large amount of cement added, the disposal cost is high, and the volume expansion ratio after treatment is large, which is not conducive to landfil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B5/00B09B3/00
Inventor 张文辉魏丽肖愉
Owner 中节能大地(杭州)环境修复有限公司