METHOD OF HYDROMETALLURGICAL REVERSE EXTRACTION OF LITHIUM FROM FRACTION OF GALVANIC BATTERIES CONTAINING LITHIUM OXIDE AND MANGANESE Russian patent published in 2017 - IPC C22B26/12 C22B7/00 C22B3/04 C22B47/00 

FIELD: chemistry.

SUBSTANCE: when the method is implemented, the said fraction with a particle size of up to 500 mcm is solubilized by administration at temperatures of 30 to 70 °C into oxalic acid, the amount of which is stoichiometrically excessive in comparison with the manganese content in lithium and manganese oxide. The process is carried out at a solid to liquid ratio in the range of 10 to 250 g/l. The resulting lithium-containing solution is separated, and the remaining precipitate is washed, at least, twice. The separated solution with lithium and the lithium-containing washing solutions are combined. The residual content of manganese in the dissolved state is reduced by precipitation in the form of hydroxide, separated and washed, and the remaining lithium-containing solution is further purified by conversion to carbonate, chloride or sulfate and, if necessary, subsequent crystallization.

EFFECT: reduction of energy consumption of the process and purity of lithium salts.

8 cl, 1 tbl, 1 ex