TREATMENT METHOD OF CONCENTRATES OF NATURAL URANIUM Russian patent published in 2009 - IPC C22B60/02 C22B3/38 

FIELD: metallurgy.

SUBSTANCE: method includes leaching of uranium concentrate by solution of nitric acid, uranium extraction by tributyl phosphate in hydrocarbon solvent. Uranium extraction is implemented up to 85-92% saturation of extragent by uranium. Then it is implemented washing of extract by part of evapoarted reextract, containing 450-500 g/l of uranium, which is implemented in the mode of ultimate (up to 119-120 g/l of uranium) of saturation of extragent by uranium. After washing it is implemented uranium re-extraction. Washing solution, received after washing of uranium extraction is combined with uranium solution from concentrates leaching and after correction by content of nitric acid and uranium mixed solution is directed to extraction. Extract washing is implemented at correlation of flows O:B=(15-20):1. Content of nitric acid in uranium solutions directed to extraction is 0.5-0.8 mole/l.

EFFECT: increasing of uranium purification efficiency from molybdenum.

4 cl, 4 tbl, 1 ex