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Investigation of Nickel Product Structures Developed during the Gaseous Reduction of Solid Nickel Oxide

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Abstract

The product microstructures developed during the reduction of dense synthetic nickel oxide in H2-N2 and H2-H2O mixtures between 300 °C and 1000 °C are reported. A number of distinctly different types of nickel product structures have been identified, namely, coarse fibrous nickel with fissures, fine porous nickel-planar interface, large porous nickel-irregular interface, and dense nickel layer. The influences of gas composition and temperature on the conditions for formation of these microstructures, and their evolution with temperature and time, have been systematically investigated. The condition for formation of the various microstructure types was summarized on morphology maps as functions of reducing gas partial pressure, thermodynamic driving force, and reaction temperature.

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Acknowledgments

The authors thank the BHP Billiton Yabulu Refinery and Australian Research Council Linkage program for the financial support, and AusAid for providing a scholarship. The authors also acknowledge Mr. John Fittock and Dr. Joy Morgan (BHP Billiton Yabulu) for their valuable help and critical discussions. The authors also thank Messrs. Yanan Guo and Jiang Chen for carrying out TEM analysis.

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Author notes

  1. M.A. Rhamdhani (Postdoctoral Research Fellow, Lecturer)

    Present address: Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Melbourne, 3122, VIC, Australia

Authors and Affiliations

  1. Pyrometallurgy Research Centre, The University of Queensland, Brisbane, 4072, QLD, Australia

    T. Hidayat (Postgraduate Research Student), M.A. Rhamdhani (Postdoctoral Research Fellow, Lecturer), E. Jak (Director) & P.C. Hayes (Xstrata Professor of Metallurgical Engineering)

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  1. T. Hidayat
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  2. M.A. Rhamdhani
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  3. E. Jak
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Corresponding author

Correspondence to T. Hidayat.

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Manuscript submitted August 24, 2008.

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Hidayat, T., Rhamdhani, M., Jak, E. et al. Investigation of Nickel Product Structures Developed during the Gaseous Reduction of Solid Nickel Oxide. Metall Mater Trans B 40, 462–473 (2009). https://doi.org/10.1007/s11663-009-9247-x

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