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Waste Management & Research, Vol. 15, No. 4, 371-382 (1997)
DOI: 10.1177/0734242X9701500405

Recovery of Gallium From Coal Fly Ash By a Dual Reactive Extraction Process

Beatriz Gutiérrez

Department of Chemical Engineering and Environmental Technology, University of Oviedo, 33071 Oviedo, Spain

Carmen Pazos

Department of Chemical Engineering and Environmental Technology, University of Oviedo, 33071 Oviedo, Spain

José Coca

Department of Chemical Engineering and Environmental Technology, University of Oviedo, 33071 Oviedo, Spain

The extraction of gallium from coal fly ash by leaching and extraction with commercial extractants Amberlite LA-2 and LIX 54N dissolved in kerosene was studied. Leaching of gallium and other metals from the fly ash was carried out with 6 M hydrochloric acid. The leaching liquor is first contacted with Amberlite LA-2 which extracts the gallium and iron. The iron is then precipitated with sodium hydroxide, while gallium remains in solution. Gallium is extracted selectively from the base solution with LIX 54; the resulting stripped solution contains 83% of the gallium present in the leaching liquor. A flow diagram for this dual-extraction process is proposed. © 1997 ISWA

Key Words: Fly ash • gallium • Amberlite LA-2 • LIX 54N • leaching • solvent extraction.


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