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

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

doi:10.1016/j.hydromet.2016.01.012

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

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

SCHOOL OF CHEMICAL ENGINEERING

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

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.

Original language	English
Pages (from-to)	29-33
Number of pages	5
Journal	Hydrometallurgy
Volume	161
DOIs	https://doi.org/10.1016/j.hydromet.2016.01.012
State	Published - 1 May 2016

Keywords

1-butyl-3-methyl-imidazolium hydrogen sulfate
Chalcopyrite
Copper ores
Ionic liquids
Leaching
Passivation

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10.1016/j.hydromet.2016.01.012

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title = "Ionic liquids as additives for acid leaching of copper from sulfidic ores",

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",

author = "Carlos Carlesi and Enrique Cortes and Gianfranco Dibernardi and Jaime Morales and Edmundo Mu{\~n}oz",

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doi = "10.1016/j.hydromet.2016.01.012",

language = "English",

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journal = "Hydrometallurgy",

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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

UR - http://www.scopus.com/inward/record.url?scp=84955462563&partnerID=8YFLogxK

U2 - 10.1016/j.hydromet.2016.01.012

DO - 10.1016/j.hydromet.2016.01.012

M3 - Article

AN - SCOPUS:84955462563

SN - 0304-386X

VL - 161

SP - 29

EP - 33

JO - Hydrometallurgy

JF - Hydrometallurgy

ER -

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

Abstract

Keywords

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