Patent AU-2022423803-A9 (AU)
Title: Method for producing lithium hydroxide
Inventor: SENBA Yusuke
IPC: C01D15/02
Filed: 2022-12-13
Abstract: P9 WO223/2024A 
2023*6 29 H (29.06.2023) W O 2023/120294 A1 
WIPO I PCT 
(51) ¶q MM 3f& A: JP]; T1058716 S A E V A# 5 T 1 
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(54) Title: METHOD FOR PRODUCING LITHIUM HYDROXIDE 
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AA BB 
cc 
CC 
EE 
FF GG 
H H 
JJ "AA Crude lithium carbonate 
Ft T -iBB Water, carbon dioxide 
CC Bicarbonation step 
2 KK DD Lithium hydrogen carbonate solution 
EE Decarboxylation step 
LL FF Purified lithium carbonate 
-IGG Mineral acid 
HH Acid solution dissolution step 
MM 11 First lithium-containing solution 
JJ Impurities removal step 
NNj KK Second lithium-containing solution 
LL Conversion step 
L_ ______J MM Lithium hydroxide-containing solution 
00 NN Crystallization step 
_ Ayfz@ _t_)_rL _ 00 Solid lithium hydroxide 
(57) 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 
C hydrogen carbonate solution. (3) Acid solution dissolution step: a step for dissolving purified lithium carbonate into an
W O 2023/120294 A0294|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 
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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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