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Metals 2015, 5(3), 1566-1579; doi:10.3390/met5031566

Chalcopyrite Dissolution at 650 mV and 750 mV in the Presence of Pyrite

1
School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China
2
Minerals and Materials Science & Technology, Mawson Institute, University of South Australia, Mawson Lakes, SA 5095, Australia
3
Blue Minerals Consultancy, 13 Mill Terrace, Middleton, SA 5213, Australia
*
Authors to whom correspondence should be addressed.
Academic Editor: Suresh Bhargava
Received: 6 August 2015 / Revised: 21 August 2015 / Accepted: 25 August 2015 / Published: 28 August 2015
(This article belongs to the Special Issue Hydrometallurgy)
View Full-Text   |   Download PDF [721 KB, uploaded 28 August 2015]   |  

Abstract

The dissolution of chalcopyrite in association with pyrite in mine waste results in the severe environmental issue of acid and metalliferous drainage (AMD). To better understand chalcopyrite dissolution, and the impact of chalcopyrite’s galvanic interaction with pyrite, chalcopyrite dissolution has been examined at 75 °C, pH 1.0, in the presence of quartz (as an inert mineral) and pyrite. The presence of pyrite increased the chalcopyrite dissolution rate by more than five times at Eh of 650 mV (SHE) (Cu recovery 2.5 cf. 12% over 132 days) due to galvanic interaction between chalcopyrite and pyrite. Dissolution of Cu and Fe was stoichiometric and no pyrite dissolved. Although the chalcopyrite dissolution rate at 750 mV (SHE) was approximately four-fold greater (Cu recovery of 45% within 132 days) as compared to at 650 mV in the presence of pyrite, the galvanic interaction between chalcopyrite and pyrite was negligible. Approximately all of the sulfur from the leached chalcopyrite was converted to S0 at 750 mV, regardless of the presence of pyrite. At this Eh approximately 60% of the sulfur associated with pyrite dissolution was oxidised to S0 and the remaining 40% was released in soluble forms, e.g., SO42. View Full-Text
Keywords: chalcopyrite; pyrite; galvanic interaction; dissolution chalcopyrite; pyrite; galvanic interaction; dissolution
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Li, Y.; Qian, G.; Li, J.; Gerson, A.R. Chalcopyrite Dissolution at 650 mV and 750 mV in the Presence of Pyrite. Metals 2015, 5, 1566-1579.

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