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公开(公告)号：US10648061B2
公开(公告)日：2020-05-12
申请号：US15754113
申请日：2015-10-16
Applicant: Albemarle Corporation
Inventor： Chi Hung Cheng , Jackson R. Switzer , Jan Nieman
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.
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公开(公告)号：US20180353907A1
公开(公告)日：2018-12-13
申请号：US15736540
申请日：2015-10-16
Applicant: ALBEMARLE CORPORATION
Inventor： Jackson R. Switzer , Chi Hung Cheng , Steven R. Alferi
CPC classification number: B01D61/022 , B01D61/027 , B01D71/16 , B01D2311/25 , B01D2317/022 , B01D2317/025 , B01J20/24 , B01J20/262 , B01J20/28035 , C02F1/441 , C02F1/442 , C02F2103/08 , C02F2301/08
Abstract: A process for removing at least Ca2+ and Mg2+ from a lithium-containing brine. The process comprises (i) providing an aqueous lithium-containing brine feed comprising dissolved Ca2+ and Mg2+ impurities in a weight ratio of Li+:Ca2+ of about 4:1 to 50:1 wt/wt and in a weight ratio of Li+:Mg2+ of about 4:1 to 50:1; (ii) subjecting said brine feed to nanofiltration to produce a lithium-containing permeate from which Ca2+ and Mg2+ components are being removed concurrently; and (iii) conducting the nanofiltration so that a separation occurs and a retentate solution is formed with a total amount of Ca2+ and Mg2+ of at least 75% of the total amount of Ca2+ and Mg2+ in the original aqueous lithium-containing brine feed and forming an aqueous lithium-containing permeate solution in which the total content of dissolved Ca2+ and Mg2+ is decreased to 25% or less as compared to the original aqueous lithium-containing brine feed.
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公开(公告)号：US20180245180A1
公开(公告)日：2018-08-30
申请号：US15754113
申请日：2015-10-16
Applicant: Albemarle Corporation
Inventor： Chi Hung Cheng , Jackson R. Switzer , Jan Nieman
CPC classification number: C22B26/12 , B01J20/041 , B01J20/046 , B01J20/08 , B01J20/28004 , B01J20/28057 , B01J20/3085 , B01J2220/56 , C01D15/04
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.
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