Thermoanalytical study on the oxidation of sulfide minerals at high temperatures

S. E. Pérez-Fontes*, M. Pérez-Tello, L. O. Prieto-López, F. Brown, F. Castillón-Barraza

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

An experimental study on the oxidation of chalcopyrite (CuFeS2), pyrite (FeS2), covellite (CuS) and chalcocite (CU2S) particles was conducted by means of differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) techniques. The oxygen concentration in the process gas was set to 40% and 70% (by volume) and a heating rate of 40°C/min was used. Response variables included the temperature of incipient reaction, the total exothermic heat of reaction, particle mass, morphology and mineralogy of the reacted particles. Based on the experimental data and phase stability calculations, reaction mechanisms were proposed to represent the behavior of the particles during oxidation. The reaction mechanisms were verified by X-ray diffraction (XRD) analyses of the oxidized particles and by thermochemical and mass balance calculations to reproduce the DSC and TGA data. Overall kinetic models were developed to represent the evolution of the exothermic heat of reaction as a function of time.

Original languageEnglish
Pages (from-to)275-283
Number of pages9
JournalMinerals and Metallurgical Processing
Volume24
Issue number4
DOIs
StatePublished - Nov 2007

Keywords

  • Flash smelting
  • Sulfide particles
  • Thermal analysis

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