公开(公告)号：US20240051838A1

公开(公告)日：2024-02-15

申请号：US18551635

申请日：2022-03-25

Applicant: IDEMITSU KOSAN CO.,LTD.

Inventor： Shota HOSHI ,  Daisuke MORI ,  Futoshi UTSUNO ,  Atsushi SATO ,  Satoshi KATSUMATA

IPC: C01D15/02 ,  B01D61/46 ,  B01D15/20 ,  C22B26/12 ,  C22B3/24 ,  C01D1/40 ,  C01D1/42 ,  B01J20/06

CPC classification number: C01D15/02 ,  B01D61/46 ,  B01D15/203 ,  C22B26/12 ,  C22B3/24 ,  C01D1/40 ,  C01D1/42 ,  B01J20/06

Abstract: A method of producing lithium hydroxide using a variety of aqueous solutions as a source liquid. The method includes: providing a lithium ion extraction liquid, including a first mixing of an aqueous solution containing lithium and at least one kind of an element other than lithium and a base in a reaction tank, with a pH regulated to 6 or more and 10 or less, a second mixing of the aqueous solution and the base, with a pH regulated to 12 or more, and removal of a hydroxide of the element other than lithium formed through the first and second mixing; recovering only lithium ion from the lithium ion extraction liquid to a recovery liquid with an electrochemical device including a Li-selectively permeable membrane; and performing the regulation of pH by returning the lithium ion extraction liquid after recovering lithium ion with the electrochemical device to the reaction tank.