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Phase Equilibria of Ferrous-Calcium Silicate Slags in the Liquid/Spinel/White Metal/Gas System for the Copper Converting Process

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Abstract

Ferrous calcium silicate (FCS) slags are reported to have high potential for use in the copper converting process. However, no phase equilibrium study has been carried out under a simulated converting gas atmosphere in the presence of SO2. In this study, under accurately controlled P(SO2) 0.4 atm and P(O2) 10−6 atm, the phase equilibria of FCS slags in a liquid/spinel/white metal/gas system were investigated for the copper converting process. The liquidus temperatures of slags in the Fe-Ca-Cu-Si-S-O system were quantified as well as the solid solubilities of Cu2O in the spinel phase. The experimental results were compared with the FactSage predictions, which provided clues for further improvement of the thermodynamic modelling. The applications of the FCS slags were further discussed and compared with iron silicate slags. The results obtained will contribute to slag development for converting operations and thermodynamic calculations.

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Acknowledgments

The authors thank the National Copper Corporation of Chile (Codelco) and Dongying Fangyuan Non-ferrous Metals for financial support. The authors acknowledge the facilities, and the scientific and technical assistance of the Australian Microscopy & Microanalysis Research Facility at the Centre for Microscopy and Microanalysis, The University of Queensland.

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Authors and Affiliations

  1. School of Chemical Engineering, The University of Queensland, Brisbane, 4072, Australia

    Yongqi Sun, Mao Chen & Baojun Zhao

  2. Dongying Fangyuan Nonferrous Metals, Dongying, 257000, China

    Zhixiang Cui

  3. National Copper Corporation of Chile, Huefanos 1270, Santiago, Chile

    Leonel Contreras

Authors
  1. Yongqi Sun
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  2. Mao Chen
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  3. Zhixiang Cui
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  4. Leonel Contreras
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  5. Baojun Zhao
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Correspondence to Mao Chen.

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Manuscript submitted February 5, 2020.

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Sun, Y., Chen, M., Cui, Z. et al. Phase Equilibria of Ferrous-Calcium Silicate Slags in the Liquid/Spinel/White Metal/Gas System for the Copper Converting Process. Metall Mater Trans B 51, 2012–2020 (2020). https://doi.org/10.1007/s11663-020-01887-9

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  • DOI: https://doi.org/10.1007/s11663-020-01887-9

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