A kind of preparation method of sodium hexabromoiridate dodecahydrate

Abstract

The invention relates to a preparation method of sodium hexabromoiridate dodecahydrate and abandons an original preparation method of carrying out double decomposition reaction on sodium hexachloroiridate and sodium bromide. The preparation method comprises the steps: with chloroiridic acid as a raw material, firstly neutralizing the chloroiridic acid into iridium oxide hydrate, dissolving the iridium oxide hydrate by virtue of a mixture of hydrobromic acid and nitric acid after chloride is cleansed, removing excess nitric acid by virtue of the hydrobromic acid to obtain an iridium bromide solution, adding the sodium bromide into the iridium bromide solution, concentrating and cooling to separate crystals, washing the crystals by virtue of ethanol, and naturally drying to obtain high-purity sodium bromoiridate. The preparation method of the sodium hexabromoiridate dodecahydrate has the beneficial effects that complex operations for repeatedly carrying out recrystallization to purify a product are omitted, the process is simple, the amount of the mother solution is greatly reduced, the use ratio of a precious metal, namely iridium is improved, the production cost is lowered, and the economic benefit is increased; the obtained sodium hexabromoiridate dodecahydrate is high in purity, the content of the iridium is more than 20.03%, and the content of a chloride purity is less than 0.01%, so that the sodium hexabromoiridate dodecahydrate can meet military research requirements.

Description

technical field [0001] The invention belongs to the field of chemical products, in particular to a preparation method of sodium hexabromoiridate dodecahydrate. Background technique [0002] Iridium is a kind of insoluble noble metal with high hardness and stable properties, which is mainly used in the manufacture of catalysts. There are few reports on the compound research of iridium, and the previous information on sodium bromoiridate is mostly prepared by the metathesis reaction of sodium chloroiridate and sodium bromide. The sodium bromoiridate prepared by this method has a low purity and contains a large amount of The sodium chloride impurity cannot meet the requirements of users, so it is necessary to develop a new process to prepare high-purity sodium bromoiridate to meet the requirements of military scientific research. [0003] After searching, no patent documents related to the content of this patent application have been found. Contents of the invention [0004...

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Problems solved by technology

There are few reports on the compound research of iridium, and the previous information on sodium bromoiridate is mostly prepared by the metathesis reaction of sodium chloroiridate and sodium bromide. The sodium bromoiridate prepared by this method has a low purity and contains a large amount of The sodium chloride impurity cannot meet the requirements of users, so it is necessary to develop a new process to prepare high-purity sodium bromoiridate to meet the requirements of military scientific research

[0003] After searching, no patent documents related to the content of this patent application have been found

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