Pyrite oxidation kinetics in an oxygen-nitrogen atmosphere at temperatures from 400 to 500 degrees C

作者：Aracena A^*; Jerez O; Ortiz R; Morales J

来源：Canadian Metallurgical Quarterly, 2016, 55(2): 195-201.

DOI：10.1080/00084433.2015.1126904

• Pyrite roasting
• Oxidation rate
• Intrinsic kinetics

This study analyses pyrite (FeS2) roasting in a temperature range of 400-500 degrees C, with partial oxygen pressure from 1.01 to 28.60 kPa and particle size between 12. 3 and 33. 0 mu m, using thermogravimetric methods. The pyrite oxidation rate was significantly influenced by temperature, partial oxygen pressure and particle size. Pyrite oxidation kinetics was also analysed, and the model X=kt gave a good description of the reaction kinetics. The dependency of pyrite oxidation on partial oxygen pressure was in the order of 3/5. The intrinsic oxidation rate constants were also determined and an activation energy value of 60. 5 kJ mol(-1) was obtained for the temperature range used in the study. The results indicate that the rate of pyrite oxidation was controlled by chemical reactions under the conditions of the experiments.

• 出版日期2016