LITHIUM CARBONATE PRODUCTION FROM BRINE

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High purity battery-grade lithium carbonate can be produced from natural or industrial brines by (i) precipitating the magnesium with calcium hydroxide, (ii) removing the boron by solvent extraction, (iii) precipitating lithium carbonate with sodium carbonate; (iv) transforming the lithium carbonate into lithium bicarbonate with carbonic acid, (v) decomposing the lithium bicarbonate into high purity lithium carbonate by heating the solution. The re-precipitation of lithium carbonate through the formation of lithium bicarbonate allows removal of most of the residual impurities from the lithium carbonate and production of a high purity battery-grade lithium carbonate.