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Ionic liquids for metal extraction from chalcopyrite: solid, liquid and gas phase studies

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Title: Ionic liquids for metal extraction from chalcopyrite: solid, liquid and gas phase studies
Authors: Kuzmina, O
Symianakis, E
Godfrey, D
Albrecht, T
Welton, T
Item Type: Journal Article
Abstract: We studied leaching of Cu and Fe from naturally occurring chalcopyrite ore using aqueous solutions of ionic liquids (ILs) based on imidazolium and ethylammonium cations and hydrogensulfate, nitrate, acetate or dicyanamide anions. Liquid, solid and gas phases of the leaching systems were characterised. We have shown that nonoxidative leaching is greatly dependant not only on temperature and pH, but on the anion species of the IL. Solutions of 1-butylimidazolium hydrogen sulfate exhibited the best leaching performance among hydrogen sulphate ILs. We have suggested that the formation of an oxide layer in some ILs may be responsible for a reduced leaching ability. The analysis of the gas phase showed the production of CO2 and CS2 in all leached samples. Our results suggested that the CS2 produced upon leaching could be responsible for decreasing the sulfur, but not oxide, layer on the surface of chalcopyrite samples and therefore more efficient leaching. This is the first study, to our knowledge, to provide a systematic comparison of the leaching performance of ILs composed of different anions and cations and without added oxidants.
Issue Date: 26-Jul-2017
Date of Acceptance: 26-Jul-2017
URI: http://hdl.handle.net/10044/1/53278
DOI: 10.1039/c7cp03540c
ISSN: 1463-9076
Publisher: ROYAL SOC CHEMISTRY
Start Page: 21556
End Page: 21564
Journal / Book Title: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume: 19
Issue: 32
Copyright Statement: © The Royal Society of Chemistry 2017
Sponsor/Funder: Technological Resources PTY Ltd
Funder's Grant Number: 3101488649
Keywords: Science & Technology
Physical Sciences
Chemistry, Physical
Physics, Atomic, Molecular & Chemical
Chemistry
Physics
DISSOLUTION KINETICS
HYDROGEN-PEROXIDE
FERRIC SULFATE
SURFACE
COPPER
ACID
MECHANISMS
CHLORIDE
MEDIA
GOLD
Science & Technology
Physical Sciences
Chemistry, Physical
Physics, Atomic, Molecular & Chemical
Chemistry
Physics
DISSOLUTION KINETICS
HYDROGEN-PEROXIDE
FERRIC SULFATE
SURFACE
COPPER
ACID
MECHANISMS
CHLORIDE
MEDIA
GOLD
02 Physical Sciences
03 Chemical Sciences
09 Engineering
Chemical Physics
Publication Status: Published
Online Publication Date: 2017-07-26
Appears in Collections:Chemistry
Catalysis and Advanced Materials
Faculty of Natural Sciences