Journal article
Understanding the mechanism and kinetics of pentlandite oxidation in extractive pyrometallurgy of nickel
Minerals Engineering, Vol.27-28, pp.11-19
2012
Abstract
Pentlandite oxidation behavior in the temperature range 530–600 °C was investigated by microscopic and kinetic methods. A clear four-step reaction sequence was identified through monitoring the reaction progress by Rietveld quantitative phase analysis of quenched samples. The first step involves the transformation of pentlandite to monosulfide solid solution (mss), (Fe, Ni)S. This is followed by the transformation from mss to α-NiS in the second step, the oxidation from Fe3O4 to Fe2O3 in the third step, and the oxidation of α-NiS to NiO in the final step. Avrami/Arrhenius analysis indicated rapid transformation of pentlandite to mss with rate constant increasing from 3.8 × 10−4 s−1 at 530 °C to 2.1 × 10−3 s−1 at 600 °C and an activation energy of 140 kJ mol−1; the rate constant for the transformation from mss to α-NiS increases from 6.7 × 10−5 s−1 at 530 °C to 4.4 × 10−4 s−1 at 600 °C with an activation energy of 151 kJ mol−1, and for the oxidation from Fe3O4 to Fe2O3 increases from 3.2 × 10−5 s−1 at 530 °C to 1.7 × 10−4 s−1 at 600 °C with an activation energy of 127 kJ mol−1. Such clear reaction mechanism and the associated kinetic data can be applied to optimize the operation conditions in industrial rosters and flash smelters to improve process efficiency and Ni recovery.
Details
- Title
- Understanding the mechanism and kinetics of pentlandite oxidation in extractive pyrometallurgy of nickel
- Authors/Creators
- F. Xia (Author/Creator) - The University of AdelaideA. Pring (Author/Creator) - The University of AdelaideJ. Brugger (Author/Creator) - The University of Adelaide
- Publication Details
- Minerals Engineering, Vol.27-28, pp.11-19
- Publisher
- Elsevier BV
- Identifiers
- 991005545214607891
- Copyright
- © 2011 Elsevier Ltd.
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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- Citation topics
- 7 Engineering & Materials Science
- 7.229 Mineral & Metal Processing
- 7.229.774 Bioleaching
- Web Of Science research areas
- Engineering, Chemical
- Mineralogy
- Mining & Mineral Processing
- ESI research areas
- Geosciences