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.
Claims16
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 the temperature of the recovery liquid is controlled at 50° C. or higher, and
- lithium hydroxide is separated from the recovery liquid.
A lithium hydroxide production apparatus equipped with:
- a Li ion recovery tank equipped with a Li permselective membrane for recovering Li ions alone from a lithium ion extract extracted from a processed member of a lithium secondary battery,
- a recovery liquid storage tank for storing the recovery liquid for recovering the Li ions,
- a temperature controlling device of controlling the recovery liquid at 50° C. or higher, and
- a separation device for separating lithium hydroxide from the recovery liquid.
The lithium hydroxide production apparatus according to claim having a filtrate recovery device of adding the filtrate formed in the crystallization device to the recovery liquid.
Dependencies are inferred from the claim text.