Technology and device for preparing metal arsenic from crude white arsenic

Abstract

The invention provides a technology and device for preparing metal arsenic from crude white arsenic. The technology comprises the following technological steps: volatilizing crude arsenic trioxide ashcontaining As2O3 more than or equal to 90% at 600-700 DEG C to obtain arsenic trioxide steam, reducing the arsenic trioxide steam into arsenic steam by a reduction furnace accommodating machined carbon heated to 700-800 DEG C, and condensing the arsenic steam into metal arsenic containing As more than or equal to 99.5% by a crystallizer at 350-420 DEG C. The microwave metallurgy technology is applied to the technology of preparing metal arsenic from coarse white arsenic. The technology has the advantages of being low in production cost, high in thermal efficiency, environmentally friendly andenergy-saving, and product quality is good. The equipment has significant characteristics of high automation degree and high production efficiency.

Description

technical field [0001] The invention belongs to the technical field of microwave metallurgy, and in particular relates to a process and equipment for preparing metallic arsenic from crude white arsenic. Background technique [0002] For the production of elemental arsenic, the existing technologies at home and abroad mainly include: hydrogen reduction method, carbon reduction method and pyrolysis method of pyrarsenite ore. The hydrogen replacement method uses hydrogen as the reducing agent, which has the risk of explosion. U.S. Patent No. 3,567,379 proposes a reduction process in which ammonia is used as a reducing agent. This process uses ammonia to decompose to produce hydrogen to reduce arsenic trioxide to produce arsenic. The process and equipment are complicated, energy consumption is large, and cost is high; carbon reduction methods are divided into two categories One is to mix arsenic trioxide with carbon, heat and reduce it in a crucible or an electric furnace, and ...

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Problems solved by technology

This type of process is simple and reliable, and the raw materials are highly adaptable, but there are problems such as serious corrosion of the furnace body, poor working environment, high labor intensity, and high production costs.

[0003] Compared with the above-mentioned process, the present invention has three independent processes of arsenic trioxide distillation, carbon reduction, and metal arsenic crystallization, microwave heating is adopted, feeding and slagging are all automatically controlled, no one touches the arsenic-containing material, and has high degree of automation, high direct recovery rate, Environmentally friendly, low labor intensity, low operating cost and other advantages, there are no relevant reports at home and abroad

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