Preparation technology and equipment for sulfur-free arsenious oxide

Abstract

The invention relates to a preparation technology and equipment for sulfur-free arsenious oxide. A special horizontal ceramic tubular reformer is adopted, and the technology is characterized in that the simple substance arsenic is oxidized at high temperature in an oxygen enrichment condition so as to remove sulfur to obtain the sulfur-free arsenious oxide. The equipment comprises a tubular structure A, a tubular structure B and a tubular structure C, wherein the tubular structure A is taken as a material section, the tubular structure B is taken as a reaction section, the tubular structure C is taken as a transition section, the diameters of the tubular structure A, the tubular structure B and tubular structure C are identical, and the preparation technology comprises two forms of interrupted feeding or uninterrupted feeding. The equipment has a simple structure, is convenient to use and easy to operate, has short processes, can be used for rapidly and effectively preparing plenty of arsenious oxide products with sulfur content less than 50PPb, and provides raw materials with low sulfur content for preparation of high purity arsenic by adopting arsenic trichloride through rectification or arsenic trioxide through distillation.

Description

technical field [0001] The present invention relates to the removal of elements that are easily oxidized into gaseous oxides that are not easy to condense in simple oxygen by oxidation reaction, so as to achieve the purpose of completely removing impurities. In particular, it relates to the sulfur-free oxidation of elemental arsenic through high-temperature oxidation under oxygen-enriched conditions to remove sulfur. Arsenic process. Background technique [0002] When preparing the compound electronic material gallium arsenide, the impurity sulfur element in the high-purity elemental arsenic raw material is a very harmful element. When preparing high-purity elemental arsenic, the concentration of sulfur element must be controlled below 10PPb. The classic process is to use oxidation Arsenic or elemental arsenic is converted into arsenic trichloride, and then let arsenic trichloride flow through a packing column filled with elemental arsenic to remove sulfur to obtain arsenic ...

AI Technical Summary

Problems solved by technology

[0002] When preparing the compound electronic material gallium arsenide, the impurity element sulfur in the raw material high-purity elemental arsenic is a very harmful element. When preparing high-purity elemental arsenic, the concentration of sulfur element must be controlled below 10PPb. The classic process is to use oxidation Arsenic or elemental arsenic is converted into arsenic trichloride, and then let arsenic trichloride flow through a packing column filled with elemental arsenic to remove sulfur to obtain arsenic trichloride with very low sulfur content. The disadvantage of this process is that the arsenic in the packing column It needs to be replaced regularly, and the stability of sulfur removal is difficult to control. If you use arsenic oxide with a very low sulfur content or the elemental arsenic reduced by arsenic oxide with a very low sulfur content, you can get trichloride with a very low sulfur content. Arsenic, to achieve high-purity elemental arsenic in the final product. The sulfur content in the high-purity elemental arsenic is stable. After distillation and purification with arsenic oxide with a very low sulfur content, high-purity elemental arsenic with a sulfur content of less than 10PPb can be obtained.