Title:
METHOD FOR PRODUCING LITHIUM HYDROXIDE
Document Type and Number:
WIPO Patent Application WO/2022/203055
Kind Code:
A1
Abstract:
The present invention provides a method for producing lithium hydroxide which employs, as a source liquid, a wide variety of aqueous solutions containing lithium and which efficiently produces highly pure lithium hydroxide from the source liquid, said method comprising: first mixing for mixing an aqueous solution that contains lithium and at least one element other than lithium, and a base in a reaction tank with pH adjusted to 6-10; second mixing for mixing with pH adjusted to 12 or more; removing a hydroxide of the element other than lithium generated in the first mixing and the second mixing to obtain a lithium ion extraction liquid; using an electrochemical device having an Li-selectively permeable membrane to recover only lithium ions in a recovery solution from the lithium ion extraction liquid; and returning the lithium ion extraction liquid from which lithium ions have been recovered by the electrochemical device to the reaction tank and carrying out the pH adjustment.
Inventors:
HOSHI SHOTA (JP)
MORI DAISUKE (JP)
UTSUNO FUTOSHI (JP)
SATO ATSUSHI (JP)
KATSUMATA SATOSHI (JP)
MORI DAISUKE (JP)
UTSUNO FUTOSHI (JP)
SATO ATSUSHI (JP)
KATSUMATA SATOSHI (JP)
Application Number:
PCT/JP2022/014488
Publication Date:
September 29, 2022
Filing Date:
March 25, 2022
Export Citation:
Assignee:
IDEMITSU KOSAN CO (JP)
International Classes:
C01D1/40; B01D61/44; B01D61/46; B01J20/06; B01J20/08; B01J49/53; C01D1/42; C01D15/02; C02F1/28; C02F1/42; C02F1/44; C02F1/469; C02F1/58; C02F1/62; C02F1/64; C22B3/22; C22B3/24; C22B3/44; C22B26/12
Domestic Patent References:
| WO2013153692A1 | 2013-10-17 |
Foreign References:
| JP2020132951A | 2020-08-31 | |||
| JP2019081953A | 2019-05-30 | |||
| JP2020193130A | 2020-12-03 |
Attorney, Agent or Firm:
OHTANI PATENT OFFICE (JP)
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