US 12,168,811 B2
Processes for preparing lithium carbonate
Guy Bourassa, Québec (CA); Gary Pearse, Ottawa (CA); Stephen Charles Mackie, Peterborough (CA); Mykolas Gladkovas, Toronto (CA); Peter Symons, Williamsville, NY (US); J. David Genders, Elma, NY (US); Jean-François Magnan, Neuville (CA); and Geneviève Clayton, Pierrefonds (CA)
Assigned to NEMASKA LITHIUM INC., Montréal (CA)
Filed by NEMASKA LITHIUM INC., Montréal (CA)
Filed on Jun. 25, 2023, as Appl. No. 18/213,844.
Application 18/213,844 is a continuation of application No. 16/185,973, filed on Nov. 9, 2018, granted, now 11,697,861.
Application 16/185,973 is a continuation of application No. 15/031,746, granted, now 10,144,990, issued on Dec. 4, 2018, previously published as PCT/CA2014/000768, filed on Oct. 23, 2014.
Claims priority of provisional application 61/894,655, filed on Oct. 23, 2013.
Prior Publication US 2023/0416874 A1, Dec. 28, 2023
Int. Cl. C22B 26/12 (2006.01); B01D 61/42 (2006.01); B01D 61/44 (2006.01); C01D 7/07 (2006.01); C22B 3/44 (2006.01); C22B 4/02 (2006.01); C25B 1/14 (2006.01); C25B 1/16 (2006.01); C25B 9/19 (2021.01); C25B 9/21 (2021.01); C25B 9/70 (2021.01); C25B 15/027 (2021.01); C25B 15/031 (2021.01); C25B 15/08 (2006.01)
CPC C22B 26/12 (2013.01) [B01D 61/422 (2013.01); B01D 61/445 (2013.01); C01D 7/07 (2013.01); C22B 3/44 (2013.01); C22B 4/02 (2013.01); C25B 1/14 (2013.01); C25B 1/16 (2013.01); C25B 9/19 (2021.01); C25B 9/21 (2021.01); C25B 9/70 (2021.01); C25B 15/027 (2021.01); C25B 15/031 (2021.01); C25B 15/08 (2013.01); B01D 2311/2684 (2013.01); C01B 2203/0283 (2013.01); Y02E 60/36 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A system for preparing lithium hydroxide, said system comprising:
an electrochemical cell, said electrochemical 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 for at least maintaining the pH of said aqueous composition comprising said lithium compound at about 2, wherein said electrochemical cell is a monopolar electrolysis cell, wherein “about” means ±10% of the value of the pH.