Applications of in situ synchrotron XRD in hydrometallurgy: Literature review and investigation of chalcopyrite dissolution

Relatedness of Cu and Fe speciation to chalcopyrite bioleaching by Acidithiobacillus ferrooxidans

“…In the present study, the CuS species were detected after Cu 2 S species were disappeared, which was also possibly caused by copper extraction from the Cu 2 S species and the formation of S n 2− -like species. The conversion of chalcocite to covellite was also demonstrated by Majuste et al (2013).…”

“…XANES spectroscopy is ascertained to be favorable for speciation analysis with high spatial resolution and high sensitivity (Ferrer and Petroff, 2002), but it is usually limited by the availability of reference compounds (Prange, 2008). More recently, SR based X-ray diffraction (XRD) has demonstrated great value for the qualitative identification of a small quantity of compounds presented on the mineral particle surface with higher signal/noise ratio and spatial resolution (Majuste et al, 2013;Salvado et al, 2009). It is illustrated by combining SR-XRD and XANES, the surface chemical species could be first qualitatively and then quantitatively analyzed, which provides more convincing results than using the single XANES or XRD method.…”

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

“…However, high redox potential (ORP) can rapidly cause the passivation of chalcopyrite due to the formation of passivation layer which was considered to be mainly consisted of disulfide (S 2 2À ), polysulfide (S n 2À ), elemental sulfur (S 0 ) and jarosite (Córdoba et al, 2008c;Klauber, 2008;Li et al, 2013;Majuste et al, 2013;Petersen and Dixon, 2006;Sandström et al, 2005). Yu et al (2011) reported that a high redox potential (ORP) can also cause the rapid deterioration of ion diffusion performance of extracellular polymeric substances (EPS) and resulted in passivation.…”

“…Many efforts have been made to investigate the dissolution mechanisms and to enhance the dissolution kinetics of chalcopyrite during bioleaching. The low dissolution rate of chalcopyrite in bioleaching was mainly attributed to the formation of passivation layer which may be mainly consisted of disulfide (S 2 2À ), polysulfide (S n 2À ), elemental sulfur (S 0 ) and jarosite (Klauber, 2008;Li et al, 2013;Majuste et al, 2013). However, the specific passivation mechanism of chalcopyrite bioleaching is still under debate because different researchers always proposed with different conclusions.…”

Carbon Material with High Specific Surface Area Improves Complex Copper Ores’ Bioleaching Efficiency by Mixed Moderate Thermophiles

“…Previous studies reported that low redox potential was in favor of the chalcopyrite bioleaching with the assistance of bioleaching bacteria [36,37]. The passivation layer hindering bioleaching performance, which was considered to mainly consist of disulfide (S 2 2− ), polysulfide (S n 2− ), elemental sulfur (S 0 ) and jarosite, rarely formed at low redox potential value [38][39][40]. In addition, high redox potentials also caused the rapid deterioration of ion diffusion performance of EPS and readily formed the passivation layer [41,42].…”