Processes for preparing lithium carbonate

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United States of America Patent

PATENT NO 11697861
APP PUB NO 20190345582A1
SERIAL NO

16185973

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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There are provided processes comprising submitting an aqueous composition comprising lithium sulphate and/or bisulfate to an electrolysis or an electrodialysis for converting at least a portion of said sulphate into lithium hydroxide. During electrolysis or electrodialysis, the aqueous composition is at least substantially maintained at a pH having a value of about 1 to about 4; and converting said lithium hydroxide into lithium carbonate. Alternatively, lithium sulfate and/or lithium bisulfate can be submitted to a first electromembrane process that comprises a two-compartment membrane process for conversion of lithium sulfate and/or lithium bisulfate to lithium hydroxide, and obtaining a first lithium-reduced aqueous stream and a first lithium hydroxide-enriched aqueous stream; and submitting said first lithium-reduced aqueous stream to a second electromembrane process comprising a three-compartment membrane process to prepare at least a further portion of lithium hydroxide and obtaining a second lithium-reduced aqueous stream and a second lithium-hydroxide enriched aqueous stream.

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Patent Owner(s)

  • NEMASKA LITHIUM INC.

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bourassa, Guy Québec, CA 28 239
Clayton, Geneviève Pierrefonds, CA 10 103
Genders, J David Elma, US 37 794
Gladkovas, Mykolas Toronto, CA 18 181
Mackie, Stephen Charles Peterborough, CA 18 181
Magnan, Jean-François Neuville, CA 24 182
Pearse, Gary Ottawa, CA 23 226
Symons, Peter Williamsville, US 23 377

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