Method for leaching solid arsenic out of arsenic sulfide slag through one step and enriching valuable metal

A valuable metal, arsenic sulfide technology, applied in the direction of improving process efficiency, can solve the problems of unindustrial application, unclear arsenic open circuit scheme, long process and other problems

Inactive Publication Date: 2015-11-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are complicated in process, long in process, and the open circuit

Method used

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  • Method for leaching solid arsenic out of arsenic sulfide slag through one step and enriching valuable metal

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0037] Example 1

[0038] The main components of arsenic sulfide slag are (wt%): As19.17, Cu10.90, S19.25. Weigh out ferrous sulfate (FeSO 4 .7H 2 O) After mixing it with arsenic sulfide slag, it is slurried with an aqueous sulfuric acid solution, and the pH of the slurry is controlled to be 1.5 and the liquid-to-solid mass ratio is 5, and placed in an autoclave; the reaction is carried out at a temperature of 150°C and an oxygen pressure of 1.5 MPa 3h; After the reaction, the liquid-solid separation is achieved by suction filtration. 95% of the copper in the arsenic sulfide residue is dissolved in the leaching solution with copper sulfate, which can be further recovered; all the arsenic sulfide in the arsenic sulfide residue is dissolved, and 95% of the arsenic is directly leached and converted into crystalline scorodite into the slag, and the rest enters In the leaching solution; the leaching toxicity of the leaching residue mainly containing scorodite meets the requirements o...

Example Embodiment

[0039] Example 2

[0040] The leaching slurry was prepared according to Example 1, placed in an autoclave, and reacted at 200° C. and an oxygen pressure of 1.0 MPa for 2 hours. After the reaction, the liquid-solid separation was achieved by suction filtration. 98% of the copper in the arsenic sulfide residue is dissolved in the leaching solution with copper sulfate, which can be further recovered; all the arsenic sulfide in the arsenic sulfide residue is dissolved, and 97% of the arsenic is directly leached and converted into crystalline scorodite into the slag, and the rest enters In the leaching solution; the leaching toxicity of the leaching residue mainly containing scorodite meets the requirements of GB5085.3-2007 (Identification Standard for Solid Waste—Identification of Extraction Toxicity), and can be stored safely and stably; the remaining liquid after the leaching solution recovers valuable metals such as copper can be Return to configure the leaching solution.

Example Embodiment

[0041] Example 3

[0042] The leaching slurry was prepared according to Example 1, placed in an autoclave, and reacted at 250° C. and an oxygen pressure of 0.5 MPa for 2.5 hours. After the reaction, the liquid-solid separation was achieved by suction filtration. 99% of the copper in the arsenic sulfide residue is dissolved in the leaching solution with copper sulfate, which can be further recovered; the arsenic sulfide in the arsenic sulfide residue is completely dissolved, and 98% of the arsenic is directly leached and converted into crystalline scorodite into the slag, and the rest enters In the leaching solution; the leaching toxicity of the leaching residue mainly containing scorodite meets the requirements of GB5085.3-2007 (Identification Standard for Solid Waste—Identification of Extraction Toxicity), and can be stored safely and stably; the remaining liquid after the leaching solution recovers valuable metals such as copper can be Return to configure the leaching solution....

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Abstract

The invention relates to a method for leaching solid arsenic out of arsenic sulfide slag through one step and enriching valuable metal. The arsenic sulfide slag serves as a raw material, iron-containing materials are added in the arsenic sulfide slag, and an acid water solution is inflated with air or oxygen for oxidizing leaching; in the leaching process, the temperature is controlled to range from 60 DEG C to 250 DEG C, and the pH value ranges from 0 to 5; the arsenic sulfide in the arsenic sulfide slag is leached out through one step and converted into solid arsenic mineral scorodite, and the valuable metal is enriched in a leaching agent. The method is simple in technology and low in cost. The toxicity of the obtained scorodite meets the regulation of GB5085.3-2007 (solid waste identification standard-leaching toxicity identification), safe and stable stockpiling can be achieved, and meanwhile the enriched valuable metal can be efficiently recycled through the later simple processing.

Description

technical field [0001] The invention relates to a method for treating arsenic sulfide slag produced in nonferrous metallurgy or chemical production, in particular to a method for leaching arsenic sulfide slag to fix arsenic in one step and enrich valuable metals at the same time. Background technique [0002] Arsenic is a highly toxic and carcinogenic element, white arsenic (As 2 o 3 ) of human acute poisoning lethal dose is only 0.2 ~ 0.6g. my country is one of the countries with the most serious arsenic pollution in the world, and the situation of arsenic pollution prevention and control is very severe. [0003] There are few independent arsenic deposits in the world, and due to the highly toxic and carcinogenic properties of arsenic, the application fields and consumption of arsenic have decreased sharply in the past 10 years. At present, independent arsenic deposits have basically stopped mining. Arsenic to arsenopyrite (FeAsS), arsenic pyrite (FeS 2 ), sulfur arseni...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B30/04C22B15/00C22B13/00C22B19/30C22B23/00C22B25/06C22B30/06
CPCY02P10/20
Inventor 刘志宏李思唯刘芳宇刘智勇李玉虎李启厚刘付朋
Owner CENT SOUTH UNIV
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