Method for producing lithium hydroxide

Patent metadata

Field	Value
Publication number	US-2024051838-A1
Application number	US-202218551635-A
Country	US
Kind code	A1
Filing date	Mar 25, 2022
Priority date	Mar 25, 2021
Publication date	Feb 15, 2024
Grant date	—

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.

First claim

1 : A method of producing lithium hydroxide, comprising:
providing a lithium ion extraction liquid, including:
a first mixing of mixing an aqueous solution containing lithium and at least one 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 mixing 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 mixing and the 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 a regulation of pH by returning the lithium ion extraction liquid after recovering the lithium ion with the electrochemical device, to the reaction tank.

2 : The method of producing lithium hydroxide according to claim 1 , wherein the providing the lithium ion extraction liquid further comprises concentrating lithium ion.

3 : The method of producing lithium hydroxide according to claim 2 , wherein the concentrating lithium ion comprises adsorbing lithium ion with an adsorbent.

4 : The method of producing lithium hydroxide according to claim 3 , wherein a gas generated from the electrochemical device is used for desorption of lithium ion adsorbed to the adsorbent.

5 : The method of producing lithium hydroxide according to claim 4 , wherein the gas is chlorine.

6 : The method of producing lithium hydroxide according claim 1 , wherein the method further comprises isolating lithium hydroxide from the recovery liquid.

7 : The method of producing lithium hydroxide according to claim 6 , wherein the isolating comprises crystallization.

8 : The method of producing lithium hydroxide according to claim 1 , wherein the at least one element other than lithium is at least one element selected from the group consisting of calcium, magnesium, strontium, manganese, iron, zinc, and lead.

9 : The method of producing lithium hydroxide according to claim 1 , wherein the base is at least selected from the group consisting of an alkali metal hydroxide and an alkaline earth metal hydroxide.

10 : The method of producing lithium hydroxide according to claim 1 , wherein the Li-selectively permeable membrane contains an oxide or an oxynitride containing lithium.

11 : The method of producing lithium hydroxide according to claim 3 , wherein the adsorbent is at least one selected from the group consisting of a titanium oxide-based adsorbent, a manganese oxide-based adsorbent, an antimony oxide-based adsorbent, an aluminum oxide-based adsorbent and an ion exchange resin.

Assignees

• Idemitsu Kosan Co

Inventors

• Hoshi Shota
• Mori Daisuke
• Utsuno Futoshi
• Sato Atsushi
• Katsumata Satoshi

Classifications

• C01D15/02 Primary

  Oxides; Hydroxides · CPC title

• B01D61/46

  Apparatus therefor · CPC title

• B01D15/203

  Equilibration or regeneration · CPC title

• C22B26/12

  Obtaining lithium · CPC title

• C22B3/24

  by adsorption on solid substances, e.g. by extraction with solid resins · CPC title