ArticleConfirmation of a sulfur-rich layer on pyrite after oxidative dissolution by Fe(lIl) ions around pH2
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Oxidation of pyrite during barite extraction
2022, Chemical GeologyCitation Excerpt :The Fe3+ concentration is constrained by adding a constant amount of goethite in samples, though some of the Fe3+ can also come from oxidation of Fe2+ at low pH (Moses et al., 1987). This result supports the current understanding that the reaction rate of pyrite oxidation driven by Fe3+ is much faster than that driven by O2 (Sasaki et al., 1995; Luther III et al., 1997; Bonnissel-Gissinger et al., 1998; Rimstidt and Vaughan, 2003; Marenco et al., 2008). Apart from dissolved O2 and DI water, carbonate, silica, goethite, and oxygen-bearing acids used during barite extraction can also be potential oxygen sources for sulfate in barite.
Mechanism of pyrite oxidation in copper(II)-ethylenediamine-thiosulphate gold leaching system
2021, Electrochimica ActaCitation Excerpt :The higher-potential peak A4 Figs. 2b) and A5 (Fig. 2b) were assigned to the oxidation of pyrite according to reactions ((1) and (2), respectively, in line with previous results [1,19–21]. It should be noted that reaction (1) is a simplified representation of the oxidation process, with S0 denoting elemental sulphur, polysulphides (FeSn), and/or metal-deficient sulphides (Fe1−xS2) [19,22,23]. FeS2 + 3H2O → Fe(OH)3 + 2S0 + 3H+ + 3e−,FeS2 + 11H2O → Fe(OH)3 + 2SO42− + 19H+ + 15e−.