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US 12,410,531 B2Granted
Processes for preparing lithium hydroxide
AssigneeNemaska Lithium Inc.
InventorsJean-François Magnan, Guy Bourassa, Gary Pearse, Peter Symons, J. David Genders
Life of this patent
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Abstract
There are provided system for preparing lithium hydroxide from an aqueous composition comprising a lithium compound and use of the system thereof to prepare lithium hydroxide, the system comprising an electrochemical cell, a pH probe and at least one inlet for receiving acid or base for maintaining pH. For example, the lithium compound can be lithium sulphate and the aqueous composition can be at least substantially maintained at a pH having a value of about 2 to about 4.
Claims20
A system for preparing lithium hydroxide, said system comprising:
- an electrolysis cell, said electrolysis cell defining an anodic compartment separated from a central compartment by an anion exchange membrane and a cathodic compartment separated from said central compartment by a cation exchange membrane, said central compartment comprising at least one inlet for receiving an aqueous composition comprising lithium compound, said cathodic compartment comprising at least one cathode wherein said cathode is configured to produce a lithium hydroxide-enriched aqueous composition, said anodic compartment comprising at least one anode,
- wherein said system further comprises a pH probe, and at least one inlet for receiving acid or base, and a pH control device for at least substantially maintaining the pH of said aqueous composition comprising said lithium compound in the central compartment at about 1 to about 4;
- wherein said system further comprises an oxidation reduction potential probe for measuring the oxidation reduction potential of the aqueous composition in the central compartment, and at least one gas sparger coupled to the electrolysis cell for maintaining the oxidation reduction potential of the aqueous composition by gas sparging.
Dependencies are inferred from the claim text.