Method for preparing metallic arsenic through As2O3 reduction

A metal arsenic and as2o3 technology, applied in the field of non-ferrous metal metallurgy, can solve the problems of potential safety hazards, low product purity, easy oxidation of arsenic vapor, etc., and achieve the effect of simple steps, strong operability, and environmental protection

Active Publication Date: 2017-08-15
CENT SOUTH UNIV
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  • Abstract
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Problems solved by technology

[0004] In view of the defects existing in the existing technology for preparing metallic arsenic, the purpose of the present invention is to provide a safe, environmentally friendly, economical method for obtaining hig...

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  • Method for preparing metallic arsenic through As2O3 reduction

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Embodiment 1

[0021] Take 50kgAs 2 o 3 Mix the powder with carbon powder (the amount of carbon powder added is 20% of the mass of the raw material) and NaOH powder (1.5 times the theoretical amount of carbon dioxide generated) and put it into a closed reaction furnace, heat up to 700°C and maintain a reducing environment for 4 hours Finally, stop heating, and after the reduction, open the outlet valve to volatilize the arsenic vapor and condense it in the condenser to obtain metallic arsenic, the purity of which is >99% after testing, and the yield of arsenic reaches 95.62%.

Embodiment 2

[0023] Take 50kgAs 2 o 3 Mix the powder with carbon powder (the addition of wood carbon powder is 15% of the raw material mass) and NaOH powder (2 times the theoretical amount of carbon dioxide generated) and put it into a closed reaction furnace, heat up to 1000 ° C and maintain a reducing environment 2 Stop heating after 1 hour, and after the reduction, open the outlet valve to volatilize the arsenic vapor and condense it in the condenser to obtain metallic arsenic. The purity is >99% after testing, and the yield of arsenic reaches 96.72%.

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Abstract

The invention discloses a method for preparing metallic arsenic through As2O3 reduction. The method comprises the steps that As2O3, a carbonaceous reducing agent and strong alkali are mixed to be uniform and then put into a closed environment for reduction roasting, after reduction roasting is completed, arsenic steam is collected and condensed, and metallic arsenic is obtained. According to the method, the metallic arsenic product with the higher value is obtained under the closed condition by taking As2O3 as a raw material, no poisonous gas is generated in the process, the problems that a traditional preparation method is poor in operating environment, serious in pollution and the like are solved, and a very good application prospect is achieved.

Description

technical field [0001] The present invention relates to a kind of preparation method of metallic arsenic, particularly a kind of As 2 o 3 The invention discloses a method for preparing metal arsenic by reduction roasting, which belongs to the technical field of nonferrous metal metallurgy. Background technique [0002] According to the analysis of the toxicity of arsenic-containing compounds and metal arsenic, high-purity arsenic is not toxic, and crude metals are next. Therefore, the extraction of crude metal arsenic from arsenic-containing materials is not only conducive to safe storage, but also has a good application prospect for the deep processing of crude metals to prepare high-purity arsenic. [0003] For the preparation of metallic arsenic, the existing technologies at home and abroad mainly include: hydrogen reduction method, carbon reduction method and pyroside decomposition method, among which carbon reduction method is currently the most commonly used method f...

Claims

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Application Information

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IPC IPC(8): C22B30/04C22B5/10
CPCC22B5/10C22B30/04
Inventor 刘维梁超焦芬覃文庆蔡练兵杨康
Owner CENT SOUTH UNIV
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