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1. (WO2017039724) PROCESSES FOR RECOVERING LITHIUM VALUES FROM LITHIUM-CONTAINING BRINES

Pub. No.:    WO/2017/039724    International Application No.:    PCT/US2015/056098
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Sat Oct 17 01:59:59 CEST 2015
IPC: C01D 15/00
C22B 26/12
Applicants: ALBEMARLE CORPORATION
Inventors: CHENG, Chi, Hung
SWITZER, Jackson, R.
NIEMAN, Jan
Title: PROCESSES FOR RECOVERING LITHIUM VALUES FROM LITHIUM-CONTAINING BRINES
Abstract:
Producing high purity lithium solution from a lithium source containing dissolved Na+, Ca2+, and Mg2+, by: passing the source into and out of a bed of sorbent composed of hydrated alumina intercalated with LiX, preferably LiCl, to extract lithium from the lithium source into the sorbent; washing the bed of sorbent with dilute aqueous LiCl to remove lithium from the sorbent to obtain a lithium eluent of increased Li+ concentration; subjecting this eluent to nanofiltration to produce a lithium permeate from which Ca2+, Mg2+, and other nanofilterable components are concurrently removed, yielding a permeate solution with 25% or less, and a retentate solution with 75% or more Ca2+ and Mg2+, as compared to the eluent from washing; and subjecting the permeate solution to a particular forward osmosis yielding a solution having 13,000-25,000 ppm dissolved lithium. Specified optional steps and new features can be used to increase lithium concentrations and purity.