Title:
METHOD FOR MANUFACTURING LITHIUM HYDROXIDE
Document Type and Number:
WIPO Patent Application WO/2023/136195
Kind Code:
A1
Abstract:
[Problem] To provide an efficient method for manufacturing high-purity lithium hydroxide, the method making it possible to raise the yield rate of lithium hydroxide and to reduce the amount of byproducts generated simultaneously with removing alkali metal impurities. [Solution] A method for producing lithium hydroxide, the method being configured from steps indicated by (A) through (F) below. (A) A step for producing a lithium hydroxide aqueous solution and sulfuric acid from lithium sulfate; (B) a crystallization step for producing lithium hydroxide crystals through crystallization from the lithium hydroxide aqueous solution; (C) a solid-liquid separation step for distilling away a slurry in the crystallization step and separating out the lithium hydroxide crystals, and a cleansing step for cleansing a solid fraction; (D) a carbonation step for distilling away a crystallization mother liquid in the crystallization step and reacting the resultant substance with carbonic acid gas to obtain a slurry including a lithium-containing carbonic acid compound, and a solid-liquid separation step for separating a lithium-containing carbonic solid fraction from the slurry; (E) an acid dissolution step for producing a lithium sulfate aqueous solution from the lithium-containing solid fraction; and (F) a step for reusing the lithium sulfate obtained in the acid dissolution step as a raw material in step (A).
Inventors:
HONDA TOMOHIRO (JP)
ZHANG ANYU (JP)
YOKOTA MASAYUKI (JP)
TAGAMI NOBUYUKI (JP)
ZHANG ANYU (JP)
YOKOTA MASAYUKI (JP)
TAGAMI NOBUYUKI (JP)
Application Number:
PCT/JP2023/000069
Publication Date:
July 20, 2023
Filing Date:
January 05, 2023
Export Citation:
Assignee:
TODA KOGYO CORP (JP)
International Classes:
B01D9/02; B01D61/44; C01D15/02; C25B1/16; C25B1/22
Foreign References:
| JP2021504885A | 2021-02-15 | |||
| JP2012504545A | 2012-02-23 | |||
| JP2009270189A | 2009-11-19 | |||
| JP2021127282A | 2021-09-02 | |||
| JP2018520971A | 2018-08-02 | |||
| JP2011518257A | 2011-06-23 | |||
| JP2004196607A | 2004-07-15 | |||
| JP2021507864A | 2021-02-25 |
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