Method for producing lithium hydroxide
AssigneeIdemitsu Kosan Co., Ltd.
InventorsDaisuke Mori, Masashi Machida, Futoshi Utsuno, Tsuyoshi Hoshino
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Abstract
Provided is a lithium hydroxide production method for producing high-purity lithium hydroxide efficiently and at a lower energy, wherein Li ions alone are recovered in a recovery liquid from a lithium ion extract extracted from a processed member of a lithium secondary battery, using a Li permselective membrane, and lithium hydroxide is produced from the recovery liquid.
Claims7
A method for producing lithium hydroxide, comprising recovering Li ions alone in a recovery liquid from a lithium ion extract extracted from a processed member of a lithium secondary battery, using a Li permselective membrane, and producing lithium hydroxide from the recovery liquid, wherein:
- the Li ions are recovered while a temperature of the recovery liquid is controlled at 50° C. or higher,
- lithium hydroxide is separated from the recovery liquid by cooling crystallization, and
- the cooling crystallization is performed with maintaining a positive pressure by blowing an inert gas into the recovery liquid for the crystallization.
Dependencies are inferred from the claim text.