Journal of Mining and Metallurgy. Section B: Metallurgy (Jan 2007)

Study of initial stage of mechanochemical transformation in pyrite

  • Paneva D.,
  • Mitova D.,
  • Manova E.,
  • Kolev H.,
  • Kunev B.,
  • Mitov I.

DOI
https://doi.org/10.2298/JMMB0701057P
Journal volume & issue
Vol. 43, no. 1
pp. 57 – 70

Abstract

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The initial stage of transformation of pyrite to Fe(II)-sulfate as a result of mechanical milling is studied by X-ray powder diffraction (XRD), Moessbauer spectroscopy (MS), Infrared (IR) and X-ray photoelectron spectroscopy (XPS) techniques. A degree of conversion of 0.071 is achieved in the time interval of 0 36 min. The kinetic data satisfy the equation of a shrinking core reaction 1-(1-α)1/3=kt. The reaction is of the first order. The calculated rate constant is k=6.434.10-4 min-1. .

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