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Metals 2016, 6(12), 303; doi:10.3390/met6120303

Thermodynamic Analysis of Possible Chalcopyrite Dissolution Mechanism in Sulfuric Acidic Aqueous Solution

1
School of Metallurgy, Northeastern University, Shenyang 110819, China
2
Beijing General Research Institute of Mining and Metallurgy, Beijing 100070, China
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 13 July 2016 / Revised: 18 November 2016 / Accepted: 25 November 2016 / Published: 2 December 2016
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Abstract

The dissolution routes of chalcopyrite in acidic sulfate aqueous solution have been discussed by thermodynamic calculation under different aqueous species concentrations, such as Cu2+, Fe2+ and H2S. The results show that for both oxidative dissolution and non-oxidative dissolution of chalcopyrite, the dissolution process undergoes several intermediate steps before completely decomposing to Cu2+, Fe2+ and elemental sulfur, in which bornite and covellite are the most likely intermediates. The dissolution routes of the secondary intermediates have also been discussed and covellite is the most likely final intermediate. Based on these results, some frequently reported phenomena, such as the existence of an optima redox potential range, the promotive action of the addition of Cu2+ and Fe2+ , as well as the preferential release of Fe2+ in the chalcopyrite leaching process, have been explained and elucidated. View Full-Text
Keywords: chalcopyrite leaching; intermediates; covellite; oxidative dissolution; non-oxidative dissolution chalcopyrite leaching; intermediates; covellite; oxidative dissolution; non-oxidative dissolution
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Lu, D.; Wang, W.; Chang, Y.; Xie, F.; Jiang, K. Thermodynamic Analysis of Possible Chalcopyrite Dissolution Mechanism in Sulfuric Acidic Aqueous Solution. Metals 2016, 6, 303.

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