Preparation method of high-purity indium

Abstract

The invention discloses a preparation method of high-purity indium, which is implemented through preparing an indium sulfate electrolyte from purified water, an analytically pure concentrated sulfuric acid, 4N metal indium, high-purity sodium chloride and analytically pure gelatin, and carrying out two-time electrolysis and then vacuum distillation on electrolytic indium under ultraclean conditions so as to obtain 5N (99.999%)-7N (99.99999%) high-purity indium. According to the invention, because a 5N (99.999%)-7N (99.99999%) high-purity indium product is finally produced by using a method for carrying out two-time electrolysis and then vacuum distillation on electrolytic indium, the advantages such as large flexibility, strong selectivity and high conversion rate of an electrolytic purification method are utilized, and after the secondary electrolysis is completed, the physical purification step of vacuum distillation is increased; and meanwhile, the pollution problem caused by reagents is avoided, and the high purity of indium products is ensured, therefore, the method is easy for industrialization.

Description

technical field [0001] The invention relates to a method for preparing high-purity indium, in particular to a method for preparing high-purity indium with a mass content of 5N (99.999%) to 7N (99.9999%). Background technique [0002] Indium is a rare metal with unique physical and chemical properties, and can be widely used in semiconductors, electronic devices, transparent conductive coatings, fluorescent materials, metal organics and other fields. The indium used in these fields is required to be high-purity, and the mass content of indium is required to reach 5N (99.999%), and even more than 6N (99.9999%). High-purity metal indium, as the basic raw material for the production of semiconductor photovoltaic materials, is attracting great attention. [0003] The preparation of high-purity indium generally uses 4N indium as a raw material, and two or more purification methods are used. There are also literature reports that a single method is used to obtain high-purity indiu...

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Problems solved by technology

[0003] The preparation of high-purity indium generally uses 4N indium as a raw material, and two or more purification methods are often used. There are also reports in the literature that high-purity indium is obtained by a single method, such as the preparation of 7N indium by a single electrolysis method, and the purification of 6N indium by vacuum distillation. No industrialization report has been seen

[0004] Although my country is a big country producing indium, there is a big gap between the technical level of my country's indium industry and the technical level of major international indium processing enterprises. At present, there is no core technology for producing 5N high-purity indium.