Article
Confirmation of a sulfur-rich layer on pyrite after oxidative dissolution by Fe(lIl) ions around pH2

https://doi.org/10.1016/0016-7037(95)00203-CGet rights and content

Abstract

The stoichiometry of pyrite dissolution by Fe(II) ions was studied in chloride media around pH 2. Pyrite was found to dissolve nonstoichiometrically during the initial tens of hours and a S-rich layer was formed on the pyrite due to preferential dissolution of iron. The major constituent of the layer was elemental S, identified by X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy.

References (26)

  • H. Peisert et al.

    Relaxation energies in XPS and XAES of solid sulfur compounds

    J. Electron Spectrosc. Relat. Phenom.

    (1994)
  • J.D. Rimstidt et al.

    Measurement and analysis of rate data: The rate of ferric iron with pyrite

    Geochim. Cosmochim. Acta

    (1993)
  • K. Sasaki

    Effect of grinding on the rate of oxidation of pyrite by oxygen in acid solutions

    Geochim. Cosmochim. Acta

    (1994)
  • Cited by (106)

    • Oxidation of pyrite during barite extraction

      2022, Chemical Geology
      Citation 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 Acta
      Citation 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−.

    View all citing articles on Scopus
    View full text