公开(公告)号：US10144990B2

公开(公告)日：2018-12-04

申请号：US15031746

申请日：2014-10-23

Applicant: NEMASKA LITHIUM INC.

Inventor： Guy Bourassa ,  Gary Pearse ,  Stephen Charles Mackie ,  Mykolas Gladkovas ,  Peter Symons ,  David J. Genders ,  Jean-François Magnan ,  Geneviève Clayton

IPC: C01D7/07 ,  C25B1/16 ,  C22B26/12 ,  B01D61/42 ,  B01D61/44 ,  C22B3/44 ,  C22B4/02 ,  C25B1/14 ,  C25B9/08 ,  C25B9/18

Abstract: 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.

公开(公告)号：US10036094B2

公开(公告)日：2018-07-31

申请号：US15031589

申请日：2014-10-23

Applicant: NEMASKA LITHIUM INC.

Inventor： Jean-François Magnan ,  Guy Bourassa ,  Gary Pearse ,  Peter Symons ,  David J. Genders ,  Geneviève Clayton

IPC: C25B1/16 ,  C25B9/08 ,  C25B9/18 ,  B01D61/42

CPC classification number: C25B1/16 ,  B01D61/422 ,  B01D2311/2684 ,  C25B9/08 ,  C25B9/18

Abstract: There are provided processes for preparing lithium hydroxide. The processes comprise submitting an aqueous composition comprising lithium sulfate and/or lithium bisulfate to a first electromembrane process that comprises a two-compartment membrane process under suitable conditions for conversion of the 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 the first lithium-reduced aqueous stream to a second electromembrane process that comprises a three-compartment membrane process under suitable conditions 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. There are also provided systems for preparing lithium hydroxide.