Production of lithium compounds directly from lithium...

Details Production of lithium compounds directly from lithium... Production of lithium compounds directly from lithium...

2007-01-02

2007-01-02

Vanoy, Timothy C. (Department: 1754)

Chemistry of inorganic compounds

Carbon or compound thereof

Oxygen containing

C423S427000, C423S179500, C423S186000, C423S209000

Reexamination Certificate

active

10395984

ABSTRACT:
A continuous process for directly preparing high purity lithium carbonate from lithium containing brines by preparing a brine containing about 6.0 wt % lithium and further containing other ions naturally occurring in brines; adding mother liquor containing carbonate to precipitate magnesium; adding a solution of CaO and sodium carbonate to remove calcium and any residual magnesium; precipitating lithium carbonate from the purified brine by adding soda ash solution; filtering to obtain solid lithium carbonate; preparing an aqueous slurry of the lithium carbonate and introducing carbon dioxide gas at a temperature from at least minus 10 to +40° C.; passing the lithium bicarbonate solution through a filter to clarify the solution; introducing said filtered lithium bicarbonate solution into a reactor and adjusting the temperature of the solution to from 60–100° C. to precipitate ultra-pure lithium carbonate.

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