EXTRAHIGH-PURITY LITHIUM CARBONATE PREPARATION METHOD Russian patent published in 2004 - IPC

FIELD: industrial inorganic synthesis.

SUBSTANCE: method comprises bicarbonization of lithium carbonate aqueous solution with carbon dioxide at stirring, 5-25^оС, and pressure up to 0.5 atm, filtration of resulting lithium bicarbonate solution at the same temperature, purification of solution on ion-exchange resin, de-bicarbonization, separation of lithium carbonate, washing with hot water, and drying. Lithium carbonate is then subjected to mechanical activation. Ion-exchange resin utilized is synthetic cation-exchange resin based on vinylpyridine compounds or sulfonic acids, or chelate compounds.

EFFECT: enabled fine purification of lithium carbonate with minimum expenses.

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