Method for removing impurity arsenic from germanium tetrachloride

Abstract

The invention relates to a method for removing impurity arsenic from germanium tetrachloride, during the technological process for producing germanium tetrachloride, germanium ore concentrate which contains arsenic being not more than 6% and is sold in market is taken as a raw material, hydrochloric acid of a certain concentration and oxidants of manganese dioxide and ferric trichloride are added, after heating, the arsenic forms a high-boiling point material, most arsenic is left in a reactor, part of the arsenic and germanium tetrachloride are distilled, so the arsenic content in the germanium tetrachloride is reduced to a parts per million (ppm) level; and during the processes of repeatedly steaming and purifying germanium tetrachloride, the product of the germanium tetrachloride in the producing process is used as the raw material, the hydrochloric acid and the manganese dioxide are added to heat and distill, the arsenic in the germanium tetrachloride is further removed, so the arsenic content in the germanium tetrachloride is reduced to be smaller than 1parts per billion (ppb) after two sections of technological production, and accordingly, the purpose of removing the arsenic is realized. The method has the advantages that: solid oxidants are convenient to add, and the ratio of the solid oxidants to the materials is easy to control; and the reaction is stable, poison gas is not easy to leak, the operation is simple, the equipment requirement is low, and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical industry. It specifically relates to the preparation of germanium tetrachloride by using high-arsenic concentrate as raw material. During the preparation and purification process of germanium tetrachloride, arsenic compounds are simultaneously generated, so that the impurity arsenic content in germanium tetrachloride is relatively high. The invention mainly adds an oxidizing agent in the process of distillation and purification to finally reduce the content of impurity arsenic in the germanium tetrachloride. Background technique [0002] Germanium is one of the important chemical elements. It has a wide range of uses in modern semiconductor, communication and electronic technology, and also has special uses in many aspects such as optical instruments, alloys, materials, glass, ceramics, aviation and medicine. An indispensable rare element in technology. [0003] At present, the common method fo...

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Problems solved by technology

But its shortcomings are that chlorine gas is a highly toxic substance, and there are certain dangers in the process of packaging, transportation, storage and use; the operating conditions are harsh;

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