Process and product
AssigneeGeo40 Limited
InventorsCampbell McNicoll, Michael T. O'Sullivan, Isabela Alvares de Castro, William B. Bourcier
Life of this patent
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Abstract
A process for mechanical separation of sorbent particles in a Direct Lithium Extraction (DLE) process using an ultrafiltration membrane and/or nanofiltration membrane. Also disclosed is a system for mechanical separation of sorbent particles in a Direct Lithium Extraction (DLE) process using an ultrafiltration membrane and/or nanofiltration membrane. Also disclosed is an improved DLE process with a pH controlled upload step.
Claims38
A process for extracting lithium from an aqueous solution containing lithium, the process comprising:
- (i) contacting an aqueous solution containing lithium with a lithium sorbent to absorb the lithium to produce a mixture of a lithium loaded sorbent and lithium depleted solution,
- (ii) separating the lithium loaded sorbent and the lithium depleted solution,
- (iii) treating the lithium loaded sorbent to produce a mixture of a lithium rich solution and a regenerated sorbent, and
- (iv) separating the lithium rich solution and the regenerated sorbent,
- wherein the pH in step (i) is controlled to provide the lithium depleted solution at a pH of about 3 to 7 and the separating step (ii) and/or the separating step (iv) comprises the use of an ultrafiltration membrane and/or a nanofiltration membrane.
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Dependencies are inferred from the claim text.