Characterization of the thermo-reduction process of chalcopyrite at 65°C by cyclic voltammetry and XANES spectroscopy

Synchrotron-based XPS and NEXAFS study of surface chemical species during electrochemical oxidation of chalcopyrite

“…In the case of pH 1.8, Cu 2 O is not likely to present on the chalcopyrite surface. Chalcocite forms at a negative potential (Liang et al, 2011;Nava et al, 2008), so covellite is the most likely explanation to this observation which formed as shown by reaction (7). In a previous study, Nava and González (2006) suggested that covellite forms in the potential range between 863 mV and 943 mV.…”

Insights into the Surface Transformation and Electrochemical Dissolution Process of Bornite in Bioleaching

“…Peak e was considered to be the reduction of Fe 3+ and bornite shown in Equations (6) and 7 [27,31,32]. Peak f should be the reduction of Cu 2 S to metal copper [31,33]:…”

Effects of pyrite and bornite on bioleaching of two different types of chalcopyrite in the presence of Leptospirillum ferriphilum

“…The cyclic voltammograms of the two different chalcopyrite electrodes were significantly different. According to many other publications, the anodic and cathodic peaks can be assigned to the corresponding oxidation-reduction reactions (Arce and González, 2002;Eghbalnia and Dixon, 2011;Gu et al, 2013;Liang et al, 2011;Zeng et al, 2013). Peak (a) was mainly considered as the reduction of chalcopyrite to chalcocite (Cu 2 S) in the presence of Cu 2+ as shown in Eq.…”

“…Hence, the effects of pyrite and bornite on bioleaching of chalcopyrite cannot be ignored. Some researchers (Gu et al, 2013;Liang et al, 2011;Majuste et al, 2012;Qin et al, 2013;Zhao et al, 2015a) have reported that chalcopyrite can be reduced to bornite at the initial stage of bioleaching and this first step was also a http://dx.doi.org/10.1016/j.biortech.2015.07.003 0960-8524/Ó 2015 Elsevier Ltd. All rights reserved. rate-limiting step.…”