Ionic liquids as additives for acid leaching of copper from sulfidic ores

Carlos Carlesi, Enrique Cortes, Gianfranco Dibernardi, Jaime Morales, Edmundo Muñoz

Resultado de la investigación: Article

10 Citas (Scopus)

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.

Idioma originalEnglish
Páginas (desde-hasta)29-33
Número de páginas5
PublicaciónHydrometallurgy
Volumen161
DOI
EstadoPublished - 1 may 2016

Huella dactilar

Ionic Liquids
Ionic liquids
Ores
Leaching
Copper
Acids
Recovery
Sulfides
Sulfuric acid
Solid solutions
Mass transfer
Metals
Decomposition
Temperature
Catalysts
Electrons
Monitoring

ASJC Scopus subject areas

  • Metals and Alloys
  • Industrial and Manufacturing Engineering
  • Materials Chemistry

Citar esto

Carlesi, Carlos ; Cortes, Enrique ; Dibernardi, Gianfranco ; Morales, Jaime ; Muñoz, Edmundo. / Ionic liquids as additives for acid leaching of copper from sulfidic ores. En: Hydrometallurgy. 2016 ; Vol. 161. pp. 29-33.
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abstract = "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.",
keywords = "1-butyl-3-methyl-imidazolium hydrogen sulfate, Chalcopyrite, Copper ores, Ionic liquids, Leaching, Passivation",
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Ionic liquids as additives for acid leaching of copper from sulfidic ores. / Carlesi, Carlos; Cortes, Enrique; Dibernardi, Gianfranco; Morales, Jaime; Muñoz, Edmundo.

En: Hydrometallurgy, Vol. 161, 01.05.2016, p. 29-33.

Resultado de la investigación: Article

TY - JOUR

T1 - Ionic liquids as additives for acid leaching of copper from sulfidic ores

AU - Carlesi, Carlos

AU - Cortes, Enrique

AU - Dibernardi, Gianfranco

AU - Morales, Jaime

AU - Muñoz, Edmundo

PY - 2016/5/1

Y1 - 2016/5/1

N2 - 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.

AB - 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.

KW - 1-butyl-3-methyl-imidazolium hydrogen sulfate

KW - Chalcopyrite

KW - Copper ores

KW - Ionic liquids

KW - Leaching

KW - Passivation

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U2 - 10.1016/j.hydromet.2016.01.012

DO - 10.1016/j.hydromet.2016.01.012

M3 - Article

AN - SCOPUS:84955462563

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JO - Hydrometallurgy

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