METHOD FOR OBTAINING LITHIUM HYDROXIDE MONOHYDRATE OF HIGH PURITY FROM MATERIALS CONTAINING LITHIUM SALTS Russian patent published in 2022 - IPC C01D15/02 C01D15/08 C25B1/34 C01D7/00 

FIELD: chemical industry.

SUBSTANCE: invention can be used in the chemical industry. The method for producing lithium hydroxide monohydrate of high purity includes membrane electrolysis of aqueous solutions of Li₂SO₄, LiCl, Li₂CO₃ or mixtures thereof. In this case, cation exchange membranes are used, separating the cathode and anode circuits of electromagnetic cells, in the mode of circulation of the catholyte in the form of lithium hydroxide solution. The method includes constant removal of a part of the catholyte from the circulating catholyte stream, evaporation of the withdrawn catholyte to obtain crystals of lithium hydroxide monohydrate, separation of crystals from the mother solution, washing with demineralized water and drying.

EFFECT: invention makes it possible to expand the nomenclature of raw materials suitable for the production of lithium hydroxide monohydrate and the nomenclature of by-products produced, increase the reliability of the membrane electrolysis operation, eliminate the formation of liquid and gaseous waste products.

16 cl, 7 dwg, 9 tbl, 5 ex