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The refining of rhodium is carried out in solution, the crude metal rhodium must be dissolved first, the methods are sodium bisulfate melting - dilute sulfuric acid leaching, medium temperature chlorination roasting - dilute hydrochloric acid leaching, pretreatment activation - aqua regia dissolution, electrochemical dissolution, etc., to obtain the H3RhCl6 solution without chaos. All of the above dissolution methods require high temperature equipment, complicated operation process, long cycle time, sometimes need to repeat several times to dissolve completely.
Therefore, there is a principle in the refining process that the rhodium solution or compound precipitate obtained should not be easily converted into metal form without confirming that its purity meets the requirements. At the same time, it is produced as a compound product as early as possible according to the market demand.
Preparation of pure chlororhodium acid (salt):Preparation of chlororhodium acid or its salt compounds with high purity is the basic step of rhodium refining. There are mainly methods such as sodium sulfite coordination, ammonia coordination, ammonium sulfite coordination, extraction and ion exchange, etc. Sometimes a combination of methods is needed.
