PROCESS AND METHOD FOR LITHIUM CARBONATE PURIFICATION BASED ON A LITHIUM CHLORIDE SOLUTION WITH IMPURITIES Russian patent published in 2023 - IPC C01D15/08 C01D7/22 C01D7/24 B01D9/02 

FIELD: inorganic chemistry.

SUBSTANCE: recovery of high purity lithium from crude lithium chloride brine. Crude brine is loaded into a feed tank maintained at temperature T₁ and containing a source of carbonate sufficient to precipitate all of the carbonate-forming solids in the crude brine to form a precipitated mixture and a crystal-free supernatant. The supernatant is fed from the feed tank to the first crystallization reactor, which is maintained at temperature T₂, crystallizing lithium carbonate therefrom. Temperature T₁ is less than temperature T₂. The flow rate is controlled by maintaining an equilibrium concentration of lithium carbonate in the dissolved phase of the crystallization reactor.

EFFECT: method allows continuous work on selective crystallization with a significant reduction in the size of the equipment used.

8 cl, 7 dwg, 2 tbl, 1 ex