CALCIFICATION METHOD OF PRODUCING LITHIUM CARBONATE FROM LITHIUM-BEARING MATERIAL Russian patent published in 2015 - IPC C01D15/08 C01D7/00 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical industry and can be used in production of lithium compounds. The method comprises three steps. The first step includes thermal decomposition of limestone to obtain unslaked lime (CaO) and carbon dioxide gas. At the second step the obtained lithium-containing solution is treated with a gaseous mixture of NH₃ and CO₂, taken in molar ratio of 2:1, to obtain a solid phase of the desired product Li₂CO₃ and a mother solution containing an ammonium salt (NH₄Cl, or NH₄NO₃, or (NH₄)₂SO₄). The third step includes calcination of the ammonium salt solution to reproduce ammonia, which is returned to the Li₂CO₃ precipitation operation.

EFFECT: invention enables to use cheap and readily available material when producing cathode material for lithium-ion batteries.

6 cl, 6 dwg, 7 ex