公开(公告)号：US11083978B2

公开(公告)日：2021-08-10

申请号：US16328220

申请日：2017-08-28

Applicant: NEMASKA LITHIUM INC.

Inventor： Jean-François Magnan ,  Guy Bourassa ,  Nicolas Laroche ,  Bertin Ouellet ,  Clive Brereton ,  Steven Buchi ,  Tsuki Naka

IPC: B01D9/00 ,  C01D15/06

Abstract: The present disclosure relates to processes for treating an aqueous composition comprising lithium sulfate and sulfuric acid. The processes comprise evaporatively crystallizing the aqueous composition comprising lithium sulfate and sulfuric acid under conditions to obtain crystals of lithium sulfate monohydrate and a lithium sulfate-reduced solution; and optionally separating the crystals of the lithium sulfate monohydrate from the lithium sulfate-reduced solution. The processes optionally further comprise concentrating the lithium sulfate-reduced solution under conditions to obtain an acidic condensate and a concentrate comprising sulfuric acid.

公开(公告)号：US10597305B2

公开(公告)日：2020-03-24

申请号：US15755507

申请日：2016-08-26

Applicant: NEMASKA LITHIUM INC.

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

IPC: C25C7/04 ,  C25C7/00 ,  C01D15/06 ,  C01D15/02 ,  C22B1/02 ,  C22B3/08 ,  C25B1/16 ,  C22B3/22 ,  C22B7/00 ,  C22B26/12 ,  B01D61/02 ,  B01D61/44 ,  B01D61/58 ,  C25B9/08 ,  B01D61/46 ,  C25B15/08

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 electromembrane 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.