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Reduction curing and stabilizing method for arsenic sulfide slag

A technology of arsenic sulfide and hydrogen chloride, which is applied in the direction of protection devices against harmful chemicals, and can solve problems such as complex process operations

Active Publication Date: 2019-11-05
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can reduce the leaching of arsenic in a short-term leaching, the process operation is complicated

Method used

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  • Reduction curing and stabilizing method for arsenic sulfide slag
  • Reduction curing and stabilizing method for arsenic sulfide slag
  • Reduction curing and stabilizing method for arsenic sulfide slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0021] The specific operation steps are as follows:

[0022] Take 0.1g of simulated arsenic sulfide slag and add it to the reaction kettle, add 0.1mol / L stannous chloride dihydrate solution to make the solid-liquid ratio 1:150g / ml, adjust the pH value to 1, stir well, and put the reaction The kettle was put into reaction at 200°C for 10 hours, cooled naturally to room temperature, washed, filtered and dried to obtain an arsenic-containing solid. After hydrothermal treatment, the residual arsenic concentration in the solution is below 5 mg / L, the arsenic fixation rate reaches 99.8%, and the toxic leaching of arsenic is 1.8 mg / L.

Embodiment example 2

[0024] Take 0.2g of simulated arsenic sulfide slag and add it to the reaction kettle, add 0.1mol / L stannous chloride dihydrate solution to make the solid-liquid ratio 1:80g / ml, adjust the pH value to 0.5, stir well, and put the reaction The kettle was placed at 200°C for 12 hours, cooled naturally to room temperature, washed, filtered and dried to obtain an arsenic-containing solid. After hydrothermal treatment, the residual arsenic concentration in the solution is below 40mg / L, the arsenic fixation rate reaches 99.5%, and the toxic leaching of arsenic is 3.8mg / L.

Embodiment example 3

[0026] Take 0.15g of simulated arsenic sulfide slag and add it to the reaction kettle, add 0.2mol / L stannous chloride dihydrate solution to make the solid-liquid ratio 1:100g / ml, adjust the pH value to 0.8, stir well, and put the reaction The kettle was placed at 200°C for 12 hours, cooled naturally to room temperature, washed, filtered and dried to obtain an arsenic-containing solid. After hydrothermal treatment, the residual arsenic concentration in the solution is below 10 mg / L, the arsenic fixation rate reaches 99.8%, and the toxic leaching of arsenic is 2.0 mg / L.

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Abstract

The invention discloses a reduction curing and stabilizing method for arsenic sulfide slag. According to the method, curing and stabilizing of the arsenic sulfide slag are achieved by introducing a mineralizing agent stannous chloride and adjusting the concentration of the mineralizing agent, the solid-liquid ratio of the arsenic sulfide slag, the pH value of a solution, the hydrothermal temperature and the like. With the arsenic sulfide slag generated by sulfuration treatment on high-concentration acidic arsenic-containing wastewater in non-ferrous metal smelting, electroplating, fertilizer production (phosphorus fertilizer production), chemical engineering and other industries as an object, after hydrothermal stabilizing and curing treatment, the arsenic leaching toxicity of arsenic-containing solids is evaluated, the leaching concentration can be reduced to 5 mg / L or below, and the stockpiling requirement of hazardous waste is met. The method is simple in treatment process and low in cost, and it is indicated that the technology is economical and effective for stabilizing the arsenic slag.

Description

technical field [0001] The invention relates to the field of environmental protection of nonferrous metal smelting technology, and to the technical field of solidification and stabilization treatment of arsenic sulfide slag. Background technique [0002] A large amount of high-concentration arsenic-containing waste liquid is produced in my country's non-ferrous metals, electroplating, fertilizer (phosphate fertilizer production), chemical industry and other industries. The high-concentration arsenic-containing waste acid is mainly treated by sulfidation precipitation process, which is simple and effective. Well is therefore widely used. However, a large amount of arsenic sulfide waste residue produced in the process is a highly toxic substance with the molecular formula As 2 S 3 , composition As60.9%, S 39.1%, natural product called orpiment, yellow or orange solid. This item is highly toxic and carcinogenic, easily soluble in alkali metal hydroxides and carbonates, oxidiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/37A62D101/47
CPCA62D3/37A62D2101/47
Inventor 张静李明洋刘峰
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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