METHOD OF THE NATURAL URANIUM CHEMICAL CONCENTRATE PROCESSING Russian patent published in 2008 - IPC C01G43/01 

FIELD: atomic industry; chemical industry; other industries; methods of processing of the chemical concentrate of the natural uranium.

SUBSTANCE: the invention is pertaining to the field of production of the fuel for the atomic power stations and may be used for production of the uranium oxides of the high purity at processing of the chemical concentrate of the natural uranium. The reprocessing of the chemical concentrate of the natural uranium XKPU with the high content of some impurities (iron, aluminum, phosphor, sulfates), especially - silicium (0.3-3.6 %, on the average - 0.5 %) is accompanied with the serious difficulties dealt with the complication of the extractive processing and the decrease of the quality of the final products. The essence of the invention consists that dissolution of the concentrate is exercise in 1.0-1.5 M nitric acid with maintenance in the solution of the preset surplus content of the nitric acid of 0.3-1.0 M, and before filtration the solution is kept settling within 4-6 hours. The invention ensures production of the uranium oxides of the nuclear purity. The offered method ensures consumption of the nitric acid for dissolution of the natural uranium XKPU makes 0.26 kg/kg of uranium, at that the operational time of the used equipment and the filtering cloth sheets is increasing.

EFFECT: the invention ensures production of the uranium oxides of the nuclear purity, consumption of the nitric acid for dissolution of the natural uranium XKPU of 260 g per 1 kg of uranium, the increased service life of the used equipment and the filtering cloth sheets.

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