A kind of reduction solidification stabilization method of 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
CN110404227BActive Publication Date: 2020-09-29RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
Publication Date
2020-09-29

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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.
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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%, S39.1%, natural product called orpiment, yellow or orange solid. This item is highly toxic and carcinogenic, easily soluble in alkali metal hydroxides and carbonates, oxidize...

Claims

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