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Reducing the Competition: A Dual-Purpose Ionic Liquid for the Extraction of Gallium from Iron Chloride Solutions
Luke M M Kinsman1, Carole A Morrison1, Bryne T Ngwenya2
1EaStCHEM School of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, UK.
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.
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