Reducing the Competition: A Dual-Purpose Ionic Liquid for the Extraction of Gallium from Iron Chloride Solutions

Luke M. M. Kinsman, Carole A. Morrison, Bryne T. Ngwenya, Jason B. Love

Research output: Contribution to journalArticlepeer-review

Abstract

The separation of gallium from iron by solvent extraction from chloride media is challenging because the anionic chloridometalates, FeCl4− and GaCl4−, display similar chemical properties. However, we report here that the selective separation of gallium from iron in HCl solution can be achieved using the dual-purpose ionic liquid methyltrioctylammonium iodide in a solvent extraction process. In this case, the reduction of Fe3+ to Fe2+ by the iodide counterion was found to inhibit Fe transport, facilitating quantitative Ga extraction by the ionic liquid with minimal Fe extraction from 2 M HCl.
Original languageEnglish
Pages (from-to)4047
JournalMolecules
Volume25
Issue number18
DOIs
Publication statusPublished - 4 Sep 2020

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