Nemaska Lithium Inc.

Vrb Power Systems Inc.

Dynamic Food Ingredients Corporation

David J Genders

Jean-François Magnan

Guy Bourassa

Gary Pearse

Peter Symons

Geneviève Clayton

Mykolas Gladkovas

Stephen Charles Mackie

Jonathan A Stapley

Timothy David John Hennessy

Gary Lepp

Peter M Kendall

Clive Brereton

Daniel M Atherton

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.

Processes and systems for preparing lithium carbonate

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.

Processes and systems for preparing lithium hydroxide

An improved redox battery energy storage system is disclosed for reducing oxygen gas levels and separating oxygen gas from hydrogen gas, thus reducing the likelihood of flammable gas explosions. The system includes at least one cell, which includes a positive compartment having positive solution, a negative compartment having negative solution, and a membrane separating the positive and negative compartments. A positive reservoir is in fluid communication with the cell's positive compartment, the positive reservoir defining a positive vent space for positive gas, which includes oxygen. A negative reservoir is in fluid communication with the cell's negative compartment, the negative reservoir defining a negative vent space. A return line is in fluid communication with the negative compartment and the negative reservoir to return the negative solution from the cell to the negative reservoir through the negative vent space. A positive gas draw line is in fluid communication with the positive vent space and coupled to the return line at a connection, causing positive gas to be siphoned from the positive vent space into the negative vent space, where the negative solution of the negative reservoir scavenges the oxygen. A balancing line is in fluid communication with the positive and the negative vent spaces to recirculate oxygen-depleted positive gas to the positive vent space.

Inherently safe redox flow battery storage system

Growing community of inventors

Elma, NY, United States of America

David J Genders