Method for leaching and simultaneously stabilizing arsenic sulfide slag

An arsenic sulfide and leaching technology, which is applied in the direction of arsenate/arsenite, etc., can solve the problems of prolonging the synthesis time of scorodite and long reaction cycle, etc., and achieve easy solid-liquid separation, simple operation, and strong practicability Effect
CN105967232AInactive Publication Date: 2016-09-28SCI RES ACADEMY OF GUANGXI ENVIRONMENTAL PROTECTION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SCI RES ACADEMY OF GUANGXI ENVIRONMENTAL PROTECTION
Publication Date
2016-09-28
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The invention relates to a method for leaching and simultaneously stabilizing arsenic sulfide slag. The method comprises the following steps: preparing ore pulp from arsenic sulfide slag under the acid condition, adding ferrous sulfate, thermophilic iron oxide microbial strains and microbial culture medium salt, filling air and stirring, oxidizing and leaching arsenic sulfide slag under the temperature of 70-95 DEG C and a pH value of 0-2.0 by taking trivalent iron generated by microbial ferrous oxide, simultaneously adsorbing iron and arsenic by using microbial cell surface and accelerating generation of scorodite crystals. The method is simple in process flow and low in cost; the concentration of arsenic leached by the generated scorodite crystals meets the stipulation of solid waste identification standard which is leaching toxicity identification (GB5085.3-2007); the arsenic can be safely piled and stored; the leaching solution can be reused.
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Description

technical field

[0001] The invention relates to the stabilization treatment of arsenic-containing waste residue, specifically a method for leaching and synchronously stabilizing arsenic sulfide residue, which is suitable for treating dirty acid by sulfuration method in non-ferrous metal smelting and phosphoric acid chemical industry after removing arsenic by sulfuration method The obtained arsenic sulfide waste residue. Background technique

[0002] Arsenic is widely associated with copper, lead, zinc, gold and other non-ferrous metal minerals and phosphorus minerals, and enters the flue gas and waste residue during the non-ferrous metal pyro-smelting process. Part of the arsenic in the flue gas is directly recovered in the form of arsenic trioxide in the dust removal stage, and the remaining arsenic is recovered with SO 2 Enter the acid system, and form arsenic sulfide waste residue through sulfidation precipitation treatment. In the phosphoric acid chemical industry, due...

Claims

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