Method and System for Preparing High Purity Lithium Carbonate
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United States of America Patent
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Sep 12, 2014
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Sep 13, 2013
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Abstract
The invention discloses a preparation method and system of high purity lithium carbonate. The preparation method comprises: concentrating carbonic acid type salt lake bittern, then heating up to saturate, crystallize and separate out the lithium carbonate, and collecting crystals to obtain refined salts of lithium carbonate; flushing the collected refined salts of lithium carbonate with distilled water with a temperature above 60° C. to dissolve sodium-potassium salts therein; drying to obtain the high purity lithium carbonate. For the lithium carbonate purification process, chemical reagents are not needed, the refining and purification of the lithium carbonate may be finished by physical operation, the purification of the refined and purified lithium carbonate is up to above 95%, which is beneficial for reducing the transportation cost at the later stage and the further purified cost. The process has an extremely low requirement for transportation and does not contaminate the environment at the same time.
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