PROCESSES FOR PREPARING LITHIUM CARBONATE

摘要

There are provided methods for preparing lithium carbonate. For example, such methods can comprise reacting an aqueous composition comprising lithium hydroxide with CO2 by sparging the CO2 the said composition, thereby obtaining a precipitate comprising the lithium carbonate. The methods can also comprise inserting at least a portion of the precipitate into a clarifier and obtaining a supernatant comprising lithium bicarbonate and a solid comprising the lithium carbonate, separating the solid from the supernatant; and heating the supernatant at a desired temperature so as to at least partially convert the lithium bicarbonate into lithium carbonate.

主权项

1. A process for preparing lithium carbonate, said process comprising:
reacting an aqueous composition comprising lithium hydroxide with CO2 by sparging said CO2 into said composition, said sparging being carried out by at least substantially maintaining pH at a value between 10 and 12, thereby obtaining a precipitate comprising said lithium carbonate; inserting at least a portion of said precipitate into a clarifier and obtaining a supernatant comprising lithium bicarbonate and a solid comprising said lithium carbonate, separating said solid from said supernatant; and heating said supernatant at a temperature of at least 85° C. so as to at least partially convert said lithium bicarbonate into lithium carbonate, wherein during said process said aqueous composition comprising lithium hydroxide is at least substantially maintained at a concentration of lithium hydroxide of about 40 to about 60 g/L.