Preparation method of solid iridium tetrachloride

Abstract

The invention provides a method for preparing a solid iridium tetrachloride product, which comprises the following steps: dissolving and breaking ammonium: completely dissolving solid ammonium chloroiridate in aqua regia to obtain an iridium liquid; nitric acid removal and concentration: hydrochloric acid is added into the iridium liquid, heating is carried out, residual nitrate ions in the iridium liquid are removed, and the solution is concentrated; oxidation reaction: chlorine is introduced into the iridium liquid subjected to nitrate removal and concentration, stirring and heating are performed, so that trivalent iridium in the iridium liquid is completely converted into tetravalent iridium, and a tetravalent iridium solution is obtained; and low-temperature drying: drying the tetravalent iridium solution in a chlorine atmosphere until the tetravalent iridium solution is converted into a tetravalent iridium solid. The method for drying in the strong oxidizing atmosphere ensures that the content of tetravalent iridium in the product solid iridium tetrachloride is greater than 99.5% under the condition of not introducing other impurities, and has important application value in production and manufacturing of precious metal products and precursor compounds.