PROCEDURE FOR PROCESSING CHEMICAL CONCENTRATE OF NATURAL URANIUM Russian patent published in 2010 - IPC C22B60/02 C22B3/06 C22B3/38 

FIELD: metallurgy.

SUBSTANCE: invention refers to procedures for processing chemical concentrate of natural uranium. The procedure consists in dissolving natural uranium in solution of nitric acid, in directing solution to uranium extraction with tri-butyl-phosphate and hydrocarbon thinner, in washing extract with re-extract and in uranium re-extracting. There is dissolved chemical concentrate of natural uranium with increased content of phosphorus and sulphur. Uranium is extracted from solutions with increased concentration of phosphorus and sulphur and with concentration of nitric acid 30÷80 g/l to 60÷75% saturation of extractant with uranium. Also this level of extractant saturation with uranium in the said range in % is maintained not exceeding value equal to (0.3×[HNO₃]+51), where [HNO₃] is concentration of nitric acid in solution directed to extraction, in g/l.

EFFECT: purification of uranium at minimal uranium losses with raffinate.

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