Bioleaching of chalcopyrite by moderately thermophilic microorganisms

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

“…In the inverse scan, C1 and C2 may be attributed to the reaction of cupric ions with chalcopyrite, CuS or elemental sulfur, producing chalcocite (Qin et al, 2013). When the potential value was lower than −0.3 V, peaks C3 and C4 were observed.…”

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

“…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.…”

Chemical and surface analysis during evolution of arsenopyrite oxidation by Acidithiobacillus thiooxidans in the presence and absence of supplementary arsenic

“…Note that diffusion mechanisms characterized with EIS measurements have been only reported for A. ferrooxidans and SM surface systems (i.e. cells, secondary compounds), which were attributed to specific requirements of Fe(II)/Fe(III) species (Bevilaqua et al, 2004(Bevilaqua et al, , 2009Liu et al, 2011), whereby this process is not required for SOM A. thiooxidans and therefore, instead, it requires direct cell attachment to SM surface to obtain its energy source throughout enzymatic mechanisms to attack i.e., S n 2− /S 0 phases (Rohwerder et al, 2003;Devasia and Natarajan, 2010). Table 5 summarizes the parameters obtained from the fits to EIS data.…”

“…It is worthile mentioning that prior to this EQ, additional EQs involving diffusive processes (i.e. solid-diffusion, Warburg type impedance) were tried, as indicated by Bevilaqua et al (2004Bevilaqua et al ( , 2009) to describe SM and leaching bacteria (i.e. A. ferrooxidans) interactions.…”