Method for producing lithium hydroxide

Patent metadata

Field	Value
Publication number	US-2023079295-A1
Application number	US-202117797397-A
Country	US
Kind code	A1
Filing date	Jan 8, 2021
Priority date	Feb 17, 2020
Publication date	Mar 16, 2023
Grant date	—

Abstract

A method for producing lithium hydroxide that allows reducing a load of removing divalent or more ions with an ion-exchange resin is provided. The method for producing lithium hydroxide includes steps (1) to (3) below. (1) a neutralization step: a step of adding an alkali to a first lithium chloride containing liquid to obtain a post-neutralization liquid, (2) an ion-exchange step: a step of bringing the post-neutralization liquid into contact with an ion-exchange resin to obtain a second lithium chloride containing liquid, and (3) a conversion step: a step of electrodialyzing the second lithium chloride containing liquid to obtain a lithium hydroxide containing liquid. Since this producing method allows roughly removing divalent or more ions in the neutralization step, a load of metal removal with the ion-exchange resin is reducible.

First claim

1 . A method for producing lithium hydroxide comprising:
adding an alkali to a first lithium chloride containing liquid to obtain a post-neutralization liquid; bringing the post-neutralization liquid into contact with an ion-exchange resin to obtain a second lithium chloride containing liquid; and electrodialyzing the second lithium chloride containing liquid to obtain a lithium hydroxide containing liquid, wherein the first lithium chloride containing liquid is obtained through:
bringing a lithium adsorbent obtained from lithium manganate into contact with a low lithium content liquid to obtain a post-adsorption lithium manganate; and
bringing the post-adsorption lithium manganate into contact with a hydrochloric acid solution to obtain the first lithium chloride containing liquid.

2 . (Currently Amender A method for producing lithium hydroxide comprising:
adding an oxidant to a first lithium chloride containing liquid to obtain a post-oxidation liquid; adding an alkali to the post-oxidation liquid to obtain a post-neutralization liquid; bringing the post-neutralization liquid into contact with an ion-exchange resin to obtain a second lithium chloride containing liquid; and electrodialyzing the second lithium chloride containing liquid to obtain a lithium hydroxide containing liquid, wherein the first lithium chloride containing liquid is obtained through:
bringing a lithium adsorbent obtained from lithium manganate into contact with a low lithium content liquid to obtain a post-adsorption lithium manganate; and
bringing the post-adsorption lithium manganate into contact with a hydrochloric acid solution to obtain the first lithium chloride containing liquid.

3 . (canceled)

4 . The method for producing lithium hydroxide according claim 1 , wherein
the ion-exchange resin used in the bringing of the post-neutralization liquid is an iminodiacetic acid type chelating resin or an iminodiacetate type chelating resin.

5 . The method for producing lithium hydroxide according to claim 4 , wherein
the iminodiacetic acid type chelating resin and the iminodiacetate type chelating resin have functional groups of a sodium form.

6 . The method for producing lithium hydroxide according to claim 1 , wherein
the bringing of the post-neutralization liquid is performed with a method using a column, and the post-neutralization liquid passing through the column has a liquid passing rate of 1 or more and 7 or less in terms of SV.

7 . The method for producing lithium hydroxide according to claim 6 , wherein
the post-neutralization liquid passing through the column has a liquid passing quantity of 10 or more and 35 or less in terms of BV.

8 . The method for producing lithium hydroxide according to claim 1 , wherein
the low lithium content liquid is salt lake brine.

Assignees

• Sumitomo Metal Mining Co

Inventors

• Matsumoto Shin-Ya
• Takano Masatoshi
• HEGURI Shin-ichi
• Asano Satoshi
• Ikeda Osamu
• Kudo Yohei

Classifications

• C01G45/01

  Preparation or separation involving a liquid-liquid extraction, an adsorption or an ion-exchange · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/483

  for non-aqueous cells (H01M4/485 takes precedence) · CPC title

• B01D61/42

  Electrodialysis; Electro-osmosis {; Electro-ultrafiltration; Membrane capacitive deionization} · CPC title

• C25B1/46

  in diaphragm cells · CPC title