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Issue 9, 2017
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Dissolution of pyrite and other Fe–S–As minerals using deep eutectic solvents

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Abstract

Processing sulfur containing minerals is one of the biggest sources of acute anthropogenic pollution particularly in the form of acid mine drainage. This study attempts to show an innovative method for processing sulfide-based minerals. It is shown that pyrite can be solubilised by both electrochemical oxidation and reduction in a deep eutectic solvent (DES) Ethaline, a mixture of choline chloride and ethylene glycol. A novel method is demonstrated to investigate the redox properties of minerals using a paste made from the mineral powder in a DES. The first bulk electrochemical dissolution of pyrite is shown without the formation of H2S or SO2. It is also shown that the soluble species, including elements such as arsenic, can be recovered electrochemically which could potentially decrease acid mine drainage. The electrochemical properties of other iron–sulfur and iron–arsenic minerals are also presented and compared to those of pyrite.

Graphical abstract: Dissolution of pyrite and other Fe–S–As minerals using deep eutectic solvents

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Publication details

The article was received on 28 Jan 2017, accepted on 31 Mar 2017 and first published on 31 Mar 2017


Article type: Paper
DOI: 10.1039/C7GC00334J
Citation: Green Chem., 2017,19, 2225-2233
  • Open access: Creative Commons BY license
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    Dissolution of pyrite and other Fe–S–As minerals using deep eutectic solvents

    A. P. Abbott, A. Z. M. Al-Bassam, A. Goddard, R. C. Harris, G. R. T. Jenkin, F. J. Nisbet and M. Wieland, Green Chem., 2017, 19, 2225
    DOI: 10.1039/C7GC00334J

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