公开(公告)号：US20160265085A1

公开(公告)日：2016-09-15

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-Frangois MAGNAN ,  Geneviève CLAYTON

IPC: C22B26/12 ,  C22B3/44 ,  C22B4/02 ,  C25B1/16 ,  B01D61/42

CPC classification number: C22B26/12 ,  B01D61/422 ,  B01D61/445 ,  B01D2311/2684 ,  C01B2203/0283 ,  C01D7/07 ,  C22B3/44 ,  C22B4/02 ,  C25B1/14 ,  C25B1/16 ,  C25B9/08 ,  C25B9/18 ,  Y02E60/366

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.

Abstract translation: 提供的方法包括将包含硫酸锂和/或硫酸氢盐的含水组合物递送到电解或电渗析中，以将至少一部分所述硫酸盐转化为氢氧化锂。 在电解或电渗析期间，水性组合物至少基本上保持在pH为约1至约4的pH; 并将所述氢氧化锂转化为碳酸锂。 或者，硫酸锂和/或硫酸氢锂可以进行第一电子过程，其包括用于将硫酸锂和/或硫酸氢锂转化为氢氧化锂的双室膜工艺，并获得第一锂还原水流和 第一个富含氢氧化锂的水流; 以及将所述第一锂还原水流提交到包括三室膜方法的第二电解方法中，以制备至少另一部分氢氧化锂并获得第二锂还原水流和第二富含氢氧化锂的水流。