Research paperThe influence of various ions in the bioleaching of metal sulphides
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2018, HydrometallurgyCitation Excerpt :These results suggest that addition of reaction catalyst would be useful in low-temperature bioleaching to realize better copper recovery. In the case of chalcopyrite bioleaching, the catalytic effect of different metal ions has been studied so far: Among those metals tested, Ag ion was found to be effective in catalyzing chalcopyrite dissolution, whereas Co, Mn, Sb, Bi, Ni and Sn ions showed weak or no catalytic abilities (Ballester et al., 1990; Muñoz et al., 2007). The mechanism of Ag-catalyzed chalcopyrite leaching has been explained by different research groups based on abiotic leaching studies, such as via (i) improvement of electrical conductivity by formation of Ag2S inside S0 layer on the chalcopyrite surface (Nazari et al., 2012), (ii) Ag atom diffusion into the metal-deficient sulfur-rich passive layer formed on the chalcopyrite surface (Ghahremaninezhad et al., 2015) and (iii) Ag2S formation which rapidly consumes H2S produced via intermediate chalcocite (Cu2S) formation from chalcopyrite, indirectly accelerating chalcopyrite dissolution (Hiroyoshi et al., 2002).