Process and equipment for preparing metallic arsenic from crude white arsenic

Abstract

The invention provides a process and equipment for preparing metal arsenic from crude white arsenic, comprising the following process steps: containing As 2 O 3 ≥90% of the crude arsenic trioxide soot is volatilized at 600℃~700℃ to obtain arsenic trioxide vapor. The arsenic trioxide vapor is reduced to arsenic vapor through a reduction furnace equipped with mechanical carbon heated to 700℃~800℃, and the arsenic vapor passes through 350℃~420℃ The crystallizer condenses to contain As ≥ 99.5% metallic arsenic. The process applies microwave metallurgy technology to the process of preparing metal arsenic from crude white arsenic, and has the advantages of low production cost, high thermal efficiency, environmental protection and energy saving, and good product quality. The equipment has a high degree of automation 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 ...

AI Technical Summary

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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