Industrialized producing method for high-purity arsenic
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A high-purity arsenic and elemental technology, applied in chemical instruments and methods, arsenic compounds, preparation with chloride, etc., can solve the problems of high cost, long process, and large pollution, so as to increase production capacity, overcome large pollution, and improve production capacity. The effect of success rate
Active Publication Date: 2008-03-19
昆明鸿世达高技术材料有限责任公司
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The United States has an annual output of 30 tons, rectification method, and fourteen processes (the United States has stopped production since 2005), which is characterized by long process, heavy pollution, and high cost. Five processes, but because it is an intermittent production process, its output is low (hundreds of kilograms a year), pollution is high, and the cost is high
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[0031] Purification and sublimation for the first time: Firstly, the raw material industrial god (99%) is sublimated under a state of vacuum of 0.1×10Pa and temperature of 540°C to obtain 3--4N arsenic with relatively small impurity content.
[0032] Secondary purification distillation: let arsenic and chlorine react chemically to obtain liquid AsCl 3 , and then make the liquid AsCl 3 Initially evaporate at 133°C to remove impurities with a boiling point higher than this temperature to obtain 4-5N liquid AsCl 3 .
[0033] Dechlorination: making liquid AsCl 3 The free excess chlorine, sulfur and selenium impurities are removed at 133°C. Get Better Liquid AsCl 3 .
[0034] Three times of purification and rectification: AsCl after dechlorination 3 After many times and repeated exchanges of vapor and liquid in the first tower, the second tower, and the third tower, 7N-8N high-purity liquid AsCl is obtained 3 .
[0035] Hydrogen reduction: making liquid AsCl 3 Reduction re...
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Abstract
The industrialized production method for preparing simple substance and high purity arsenic disclosed by the present invention relates to a method for industrialized arsenic production, in particular to a high purity (the purity is above 99.9999 percent) continuous industrialized production method. The concrete method is realized by: first, using industrial arsenic with the purity of 99 percent the raw material, to be sublimated; second, performing chlorination reaction and synthetizing AsCl 3 ; third, distilling; fourth, dechlorinating; fifth, performing fractional dictillation through a first tower, a second tower, and a third tower; sixth, performing hydrogen reduction to obtain the end product, and packing in a non-oxygen condition. The present invention has the advantages that the vacuum sublimation is adopted, the purity of the raw material can reach 99.99 percent from 99 percent of the industrial arsenic through once sublimation, and the production capacity can be improved; the dechlorinating and the distilling processes of the present invention can eliminate various impurities with only one step, can reduce the waste material, and improve the yield rate. The other remarkable advantage of the present invention is continuous production, thereby overcoming the severe abuses of heavy pollution, unstable quality, etc.
Description
technical field [0001] The invention relates to a method for industrialized production of arsenic, in particular to a continuous industrialized production method for high-purity arsenic (with a purity of more than 6 nines). Background technique [0002] High-purity semiconductor material (6 N, 7N above 5N) arsenic is mainly used to prepare chips, LEDs (light-emitting diodes), solar cells, and devices made with it, which have large capacity, fast speed, low power consumption, anti-vibration, and anti-aging , anti-radiation, long life and other characteristics, widely used in aerospace, satellite, windows, remote control, integrated circuits, computers, military and other fields, has a broad market prospect. [0003] For a long time, high-purity arsenic (7N is 7 nines, 99.99999%) can only be produced by a few countries such as the United States, Japan, Germany, Britain, and Russia. Although China has a history of nearly 30 years, it is only at the laboratory scale At present,...
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