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Experimental Study of the Individual Effects of Al2O3, CaO and MgO on Gas/Slag/Matte/Spinel Equilibria in Cu-Fe-O-S-Si-Al-Ca-Mg System at 1473 K (1200 °C) and p(SO2) = 0.25 atm

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Abstract

The individual effects of Al2O3, CaO and MgO on gas/slag/matte/spinel equilibria in the Cu-Fe-O-S-Si-(Al, Ca, Mg) system at 1473 K (1200 °C) and p(SO2) = 0.25 atm. have been experimentally measured for a range of oxygen partial pressures and matte compositions. The experimental methodology has included the high temperature equilibration of individual samples on a spinel primary phase substrate under controlled gas atmospheres (CO/CO2/SO2/Ar), followed by rapid quenching of the equilibrium condensed phases and direct measurement of the phase compositions using electron probe x-ray microanalysis. The experimental results show that the presence of Al2O3, CaO and MgO reduce the iron, sulphur and copper concentrations in the slag phase. Present study is undertaken as part of an integrated approach involving thermodynamic modelling and experimental measurements. The experimental data are compared with predictions obtained using the current thermodynamic database for the Cu-Fe-O-S-Si-(Al, Ca, Mg) system in order to further improve thermodynamic parameters.

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Acknowledgments

The authors would like to thank Australian Research Council Linkage program LP140100480, Altonorte Glencore, AngloAmerican Platinum, Atlantic Copper, Aurubis, Boliden, Olympic Dam Operation BHP Billiton, Kazzinc Glencore, Kennecott Rio Tinto, Outotec Oy (Espoo), PASAR Glencore, Umicore, and for the financial support for this study. The authors would like to thank Dr Denis Shishin and Dr Maksym Maksym Shevchenko for assistance in preparation of this paper. The authors would also like to thank the staff of the Centre for Microscopy and Microanalysis, University of Queensland for technical support.

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Authors and Affiliations

  1. Pyrometallurgy Innovation Centre (PYROSEARCH), School of Chemical Engineering, The University of Queensland, Brisbane, QLD, 4072, Australia

    Svetlana Sineva, Peter C. Hayes & Evgueni Jak

  2. PYROSEARCH, Aurubis AG, 20539, Hamburg, Germany

    Ata Fallah-Mehrjardi

  3. PYROSEARCH, Bandung Institute of Technology, Bandung, 40132, Indonesia

    Taufiq Hidayat

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  1. Svetlana Sineva
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  2. Ata Fallah-Mehrjardi
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  3. Taufiq Hidayat
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  4. Peter C. Hayes
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Correspondence to Svetlana Sineva.

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Sineva, S., Fallah-Mehrjardi, A., Hidayat, T. et al. Experimental Study of the Individual Effects of Al2O3, CaO and MgO on Gas/Slag/Matte/Spinel Equilibria in Cu-Fe-O-S-Si-Al-Ca-Mg System at 1473 K (1200 °C) and p(SO2) = 0.25 atm. J. Phase Equilib. Diffus. 41, 859–869 (2020). https://doi.org/10.1007/s11669-020-00847-9

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