Method for innocent treatment of arsenic sulfide residues

A technology of harmless treatment and arsenic sulfide, which is applied in the direction of protection devices against harmful chemicals, can solve the problems of long stirring time and high energy consumption, and achieve the effects of short stirring time, low energy consumption and simple process flow

Inactive Publication Date: 2016-09-28
云南大地丰源环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is simple and operable, but the stirring time is long and the energy consumption is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] At room temperature, weigh 100g of arsenic sulfide slag, add 50mL of water, add sodium sulfide (Na 2 S), stirred and reacted until the pH value was 9, placed in a reactor and stirred evenly, and reacted for 60 minutes; added 5 mL of hydrogen peroxide, and oxidized for 30 minutes; added 6 g of polyferric sulfate (PFS), stirred for 20 minutes to complete the stabilization of arsenic; , stirring for 5 minutes; maintenance.

[0022] Performance test: According to the solid waste toxic leaching method-horizontal oscillation method (GB 5086.2-1997), the arsenic leaching concentration meets the pollution control standard of hazardous waste landfill (GB 18598-2001).

Embodiment 2

[0024] At room temperature, weigh 100g of arsenic sulfide slag, add 50mL of water, add sodium sulfide (Na2S), stir the reaction until the pH value is 10, put it in the reactor and stir evenly, and react for 40min; add 5mL of hydrogen peroxide, oxidize for 30min; add 5g Add ferrous sulfate, stir for 20 minutes to complete the stabilization of arsenic; add 20g of cement, stir for 5 minutes; carry out curing.

[0025] Performance test: According to the solid waste toxic leaching method-horizontal oscillation method (GB 5086.2-1997), the arsenic leaching concentration meets the pollution control standard of hazardous waste landfill (GB 18598-2001).

Embodiment 3

[0027] At room temperature, weigh 100g of arsenic sulfide slag, add 50mL of water, add sodium sulfide (Na2S), stir the reaction until the pH value is 11, put it in the reactor and stir evenly, react for 30min; add 5mL of hydrogen peroxide, oxidize for 30min; add 6g Add polyaluminum chloride (PAC) and stir for 20 minutes to complete the stabilization of arsenic; add 20g of cement and stir for 5 minutes; perform curing.

[0028] Performance test: According to the solid waste toxic leaching method-horizontal oscillation method (GB 5086.2-1997), the arsenic leaching concentration meets the pollution control standard of hazardous waste landfill (GB 18598-2001).

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PUM

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Abstract

The invention discloses a method for harmless treatment of arsenic sulfide slag, which comprises the following steps: adding water to arsenic sulfide slag at room temperature, mixing to obtain mixture I, adding sodium sulfide to react to obtain mixture II, and then Add oxidant to carry out oxidation reaction to obtain mixture III, then add iron salt or aluminum salt for reaction to obtain mixture IV, and then add cement. The invention has the advantages of being able to effectively reduce the arsenic leaching concentration of the arsenic sulfide slag, the treated arsenic sulfide slag meets the requirements for hazardous waste landfill, simple process flow, small volume increase, strong operability, short stirring time, and low consumption.

Description

technical field [0001] The invention belongs to the technical field of harmless treatment of hazardous waste, in particular to a method for harmless treatment of arsenic sulfide slag. Background technique [0002] Arsenic (As) and its compounds are highly toxic substances. Arsenic in arsenic sulfide slag is in the form of amorphous sulfide (As 2 S 2 or As 2 S 3 or As 2 S 5 ) form, and is easily dissolved in an acidic or alkaline environment, causing serious pollution to water and soil. [0003] At present, the treatment of arsenic sulfide slag is mainly for resource utilization and solidification and stabilization treatment. Its resource utilization mainly involves leaching arsenic to produce arsenic-containing substances such as arsenic oxide. Due to the strong toxicity of arsenic and its compounds, difficult market management, relatively small usage and high purity requirements, most of the arsenic sulfide slag is in a stockpiled state and needs to be treated urgen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/38A62D101/43
CPCA62D3/38A62D2101/43
Inventor 陈小凤吴启模任雪娇尹砾珩李成跃杨兆标邱金成
Owner 云南大地丰源环保有限公司
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