Ionic liquids as additives for acid leaching of copper from sulfidic ores
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Fecha
2016-05
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
Elsevier
Nombre de Curso
Licencia CC
Atribución 4.0 Internacional (CC BY 4.0)
Licencia CC
https://creativecommons.org/licenses/by/4.0/deed.es
Resumen
Two acid imidazolium-based Ionic liquids (ILs) were evaluated for use in the leaching of a real non-concentrated chalcopyrite ore in an aerated system at different temperatures, monitoring copper recoveries in aqueous solution and in the presence of sulfuric acid. When ILs were used contemporaneously with the acid, synergic effects were found; these effects were mainly related to the IL action of decreasing the solid-solution hydrophobic resistance to electron transfer, thus enabling continuous acid leaching of the solid surface. Temperatures higher than 60 °C trigger high increases in copper recoveries (up to 70% copper recovery); this could occur due to the promotion of the parallel chemical decomposition of metal sulfide intermediates and the decrease of mass transfer limitations. In light of the obtained results, it is proposed that ionic liquids could be considered as catalyst or leaching additives rather than leaching agents itself. © 2016 Elsevier B.V. B.V. All rights reserved.
Notas
Indexación: Scopus
Palabras clave
1-butyl-3-methyl-imidazolium hydrogen sulfate, Chalcopyrite, Copper ores, Ionic liquids, Leaching, Passivation
Citación
Hydrometallurgy Volume 161, Pages 29 - 331 May 2016
DOI
10.1016/j.hydromet.2016.01.012