PURIFICATION OF LITHIUM-CONTAINING BRINE

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 ab...

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Bibliographische Detailangaben
Hauptverfasser: CHENG, CHI HUNG, ALFERI, STEVEN R, SWITZER, JACKSON R
Format: Patent
Sprache:eng ; fre
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Zusammenfassung: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.