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Reaction Kinetics and Oxidation Mechanisms of the Conversion of Pyrite to Ferrous Sulphate: A Mössbauer Spectroscopy Study

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Abstract

Pyrite undergoes a series of exothermic reactions during mine roasting to porous hematite. At low temperatures, the first non-refractive phase to form is ferrous sulphate and could be a cheaper alternative to hematite roasting for the mining industry. In this study, pyrite powder is heated in air at temperatures between 200 and 370 °C for 1 to 256 h in a temperature and time series. The rate of oxidation of pyrite to ferrous sulphate is modelled by combining the Arrhenius equation with the Weibull function to extract reliable thermodynamic data, including the energy of activation, the frequency factor and the overall order of reaction. From the thermodynamic data obtained, two possible oxidation mechanisms are recognized, depending on the bond dissociation energies of the S–S and Fe–S bonds in pyrite.

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Authors and Affiliations

  1. GeoBiosphere Science Centre, Department of Geology, Lithosphere Biosphere Science, Lund University, Sölvegatan 12, SE-223 62, Lund, Sweden

    Embaie A. Ferrow & Maria Mannerstrand

  2. Swedish Museum of Natural History, Box 50007, SE-I04 05, Stockholm, Sweden

    Bosse Sjöberg

Authors
  1. Embaie A. Ferrow
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  2. Maria Mannerstrand
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  3. Bosse Sjöberg
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Correspondence to Embaie A. Ferrow.

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Ferrow, E.A., Mannerstrand, M. & Sjöberg, B. Reaction Kinetics and Oxidation Mechanisms of the Conversion of Pyrite to Ferrous Sulphate: A Mössbauer Spectroscopy Study. Hyperfine Interact 163, 109–119 (2005). https://doi.org/10.1007/s10751-005-9200-6

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  • DOI: https://doi.org/10.1007/s10751-005-9200-6

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