The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 21, 2021
Filed:
May. 11, 2017
Applicant:
Bl Technologies, Inc., Minnetonka, MN (US);
Inventor:
Frederick Liberatore, Carlsbad, CA (US);
Assignee:
BL TECHNOLOGIES, INC., Minnetonka, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D 61/02 (2006.01); C02F 1/44 (2006.01); C02F 101/10 (2006.01); C02F 5/02 (2006.01); C02F 103/08 (2006.01);
U.S. Cl.
CPC ...
C02F 5/02 (2013.01); B01D 61/022 (2013.01); B01D 61/027 (2013.01); C02F 1/442 (2013.01); B01D 2317/025 (2013.01); C02F 2101/101 (2013.01); C02F 2103/08 (2013.01);
Abstract
Lithium brine is treated with a multiple pass nanofiltration (NF) membrane system. Sulfate is added to permeate from an upstream pass before it flows through a downstream pass. Optionally the sulfate may be added to the permeate by dosing it with sulfuric acid or a slat such as sodium sulfate. The softened brine may then be processed further, for example by a combination of solvent extraction, electrolysis, crystallization and drying, to produce a lithium hydroxide product that can be used to make batteries.