Title:
METHOD FOR PRODUCING LITHIUM HYDROXIDE
Document Type and Number:
WIPO Patent Application WO/2023/120294
Kind Code:
A1
Abstract:
Provided is a method for producing lithium hydroxide by which it is possible to obtain a high-purity lithium hydroxide by reducing impurities to a predetermined level prior to an electrodialysis conversion step. The lithium hydroxide production method includes steps (1)-(5). (1) Bicarbonation step: a step for blowing carbon dioxide into a slurry in which water and a crude lithium hydroxide are mixed. (2) Decarboxylation step: a step for heating a lithium hydrogen carbonate solution. (3) Acid solution dissolution step: a step for dissolving purified lithium carbonate into an acid solution. (4) Impurities removal step: a step for removing a portion of metal ions from a first lithium-containing solution. (5) Conversion step: a step for converting a lithium salt contained in a second lithium-containing solution into lithium hydroxide by electrodialysis. In this production method, metals other than lithium can be reliably removed and as a result, the lithium hydroxide with higher degree of purity can be obtained.
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Inventors:
SENBA YUSUKE (JP)
TAKANO MASATOSHI (JP)
ASANO SATOSHI (JP)
HEGURI SHIN-ICHI (JP)
TAKANO MASATOSHI (JP)
ASANO SATOSHI (JP)
HEGURI SHIN-ICHI (JP)
Application Number:
PCT/JP2022/045799
Publication Date:
June 29, 2023
Filing Date:
December 13, 2022
Export Citation:
Assignee:
SUMITOMO METAL MINING CO (JP)
International Classes:
C01D15/02; C22B3/42; C22B3/44; C22B26/12
Domestic Patent References:
| WO2021166479A1 | 2021-08-26 |
Foreign References:
| JPS4823698A | 1973-03-27 | |||
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| CN109850927A | 2019-06-07 | |||
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| JP2019153562A | 2019-09-12 | |||
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Other References:
JIAN WU, YAO CHUN YAO, YONG NIAN DAI, BIN YANG: "Effect of Cycles and Ion-Exchange on the Purification of Lithium Carbonate", ADVANCED MATERIALS RESEARCH, SCIENTIFIC.NET, CH, vol. 443-444, 1 January 2012 (2012-01-01), CH , pages 594 - 600, XP009546883, ISSN: 1022-6680, DOI: 10.4028/www.scientific.net/AMR.443-444.594
MASAO KOBAYASHI, LITHIUM: "its History, Source, Production, and Application", JOURNAL OF THE MINING INSTITUTE OF JAPAN, vol. 100, no. 1152, 1984, pages 115 - 122
MASAO KOBAYASHI, LITHIUM: "its History, Source, Production, and Application", JOURNAL OF THE MINING INSTITUTE OF JAPAN, vol. 100, no. 1152, 1984, pages 115 - 122
Attorney, Agent or Firm:
YAMAUCHI PATENT ATTORNEYS (JP)
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