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Phase Equilibrium Study of ZnO-“FeO”-SiO2 System at Fixed Po2 10−8 atm

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Abstract

Experimental studies of phase equilibria and liquidus temperatures have been carried out in the systems “FeO”-SiO2 and ZnO-“FeO”-SiO2 at Po2 10−8 atm. Research techniques have been developed to enable the ZnO-containing system to be investigated under reducing conditions controlled by CO-CO2 gas mixture. The experimental approach includes master slag preparation, high-temperature equilibration, quench, and electron probe X-ray microanalysis (EPMA). Phase compositions in the quenched samples were measured by EPMA and used for construction of phase diagram. It was found that the isotherms of the system ZnO-“FeO”-SiO2 at Po2 10−8 atm are significantly different from those in equilibrium with metallic iron and those predicted by FactSage. The presence of ZnO in copper smelting slag significantly increases the liquidus temperature in spinel primary phase field. Partitioning of ZnO in liquid and spinel is also discussed in this paper.

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Acknowledgments

The authors wish to thank Dongying Fangyuan Nonferrous Metals Co., Ltd. and The University of Queensland for providing the financial support to enable this research to be carried out; The University of Queensland International Research Tuition Award (UQIRTA) and China Scholarship Council (CSC) for providing scholarships for Hongquan Liu; and Mr. Ron Rasch and Ms Ying Yu of the Centre for Microscopy and Microanalysis at the University of Queensland, who provided technical support for the EPMA facilities.

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Authors and Affiliations

  1. The University of Queensland, Brisbane, Australia

    Hongquan Liu (Ph.D. Student), Mao Chen (Postdoctoral Research Fellow) & Baojun Zhao (Codelco-Fangyuan Professor)

  2. Dongying Fangyuan Nonferrous Metals Co., Ltd., Dongying, China

    Zhixiang Cui (President)

Authors
  1. Hongquan Liu
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  2. Zhixiang Cui
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  3. Mao Chen
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  4. Baojun Zhao
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Correspondence to Baojun Zhao.

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Manuscript submitted May 29, 2015.

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Liu, H., Cui, Z., Chen, M. et al. Phase Equilibrium Study of ZnO-“FeO”-SiO2 System at Fixed Po2 10−8 atm. Metall Mater Trans B 47, 164–173 (2016). https://doi.org/10.1007/s11663-015-0480-1

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