METHOD OF PRODUCING HIGHLY PURE CADMIUM CARBONATE Russian patent published in 2014 - IPC C01G11/00 

FIELD: chemistry.

SUBSTANCE: method of producing highly pure cadmium carbonate involves treating aqueous cadmium nitrate solution, purified in advance, with aqueous ammonia solution, followed by carbonisation of the intermediate product - cadmium ammoniate - with carbon dioxide gas and separating the end product, wherein 15-30% aqueous cadmium nitrate solution is treated with 25-30% aqueous ammonia solution with volume ratio of ammonia solution to cadmium nitrate solution of (0.62-0.65):1. Carbonisation is carried out by passing carbon dioxide gas through the reaction mass at a rate of 0.10-0.28 l/min. The separated cadmium carbonate precipitate is washed with distilled water and dried at 100-110°C.

EFFECT: invention enables to obtain highly pure cadmium carbonate with high content of the basic substance and high output, which is suitable for producing optical glass.

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