FIELD: chemical engineering. SUBSTANCE: claimed method comprises cleaning mother liquor from alkali metals, magnesium and alkaline earth metals by passing the mother liquor through layer of sorbent selective to lithium ions, eluting the lithium chloride and simultaneously concentrating it, electrochemical conversion of lithium chloride conversion in electrodialysis device to obtain lithium hydroxide solution or salt thereof. Subsequently concentrating the resulting solution and crystallizing the final product. EFFECT: more efficient preparation method. 5 cl, 4 dwg
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