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1. (WO2017031595) METHODS FOR TREATING LITHIUM-CONTAINING MATERIALS

Pub. No.:    WO/2017/031595    International Application No.:    PCT/CA2016/051008
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Sat Aug 27 01:59:59 CEST 2016
IPC: C01D 1/04
B01D 61/42
C01D 1/28
C01D 1/38
C01D 1/40
C22B 1/02
C22B 3/08
Applicants: NEMASKA LITHIUM INC.
Inventors: MAGNAN, Jean-François
BOURASSA, Guy
LAROCHE, Nicolas
PEARSE, Gary
MACKIE, Stephen, Charles
GLADKOVAS, Mykolas
SYMONS, Peter
GENDERS, J. David
CLAYTON, Geneviève
BOUCHARD, Pierre
OUELLET, Bertin
Title: METHODS FOR TREATING LITHIUM-CONTAINING MATERIALS
Abstract:
The disclosure relates to methods for preparing lithium hydroxide. For example, such methods can comprise mixing a lithium-containing material with an acidic aqueous composition optionally comprising lithium sulfate and thereby obtaining a mixture; roasting the mixture under suitable conditions to obtain a roasted, lithium-containing material; leaching the roasted material under conditions suitable to obtain a first aqueous composition comprising lithium sulfate; submitting the first aqueous composition comprising lithium sulfate to an electromembrane process under suitable conditions for at least partial conversion of the lithium sulfate into lithium hydroxide and to obtain a second aqueous composition comprising lithium sulfate, the electomembrane process involving a hydrogen depolarized anode; optionally increasing concentration of acid in the second aqueous composition; and using the second aqueous composition comprising lithium sulfate as the acidic aqueous composition optionally comprising lithium sulfate for mixing with the lithium-containing material and to obtain the mixture.