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Study of Phase Relations of ZnO-Containing Fayalite Slag Under Fe Saturation

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Abstract

A ZnO-containing fayalite-based slag can be formed in copper smelting from secondary raw materials and its high viscosity is a common issue that hinders slag tapping. In this work, the crystallization behavior of the industrial slag was observed in situ by confocal laser scanning microscopy. Solid precipitation was found to be the major cause of the poor slag fluidity. The phase relations in the industrial slag system ZnO-“FeO”-SiO2-Al2O3-CaO (CaO/SiO2 = 0.05, Al2O3/SiO2 = 0.15) were investigated by quenching the samples after reaching equilibrium at 1423 K (1150 °C) under iron saturation. The equilibrium composition of the phases was determined with electron probe micro-analysis. The effect of individual components, such as FeO, ZnO, and CaO on the phase equilibrium of the slag system has been quantitatively studied. The relation between the solid-phase fraction and the chemical composition of the slag has been revealed. Suggestions to modify the slag composition toward low viscosity are provided.

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Acknowledgments

The research work in the present paper was performed with the financial support from the Agency for Innovation by Science and Technology (IWT project No. 990348). The authors appreciate the close co-operation of Mettallo-Chimique. H. Shi and L. Chen also thank China Scholarship Council (CSC) for offering scholarship (Nos. 201208420605 and 201207040008).

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Authors and Affiliations

  1. Department of Materials Engineering, KU Leuven, Leuven, Belgium

    Huayue Shi (Ph.D. Student), Liugang Chen (Ph.D. Student), Annelies Malfliet (Senior Researcher), Peter Tom Jones (Senior Researcher), Bart Blanpain (Full Professor) & Muxing Guo (Senior Expert Researcher)

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  1. Huayue Shi
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  2. Liugang Chen
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  3. Annelies Malfliet
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  6. Muxing Guo
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Correspondence to Muxing Guo.

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Manuscript submitted April 6, 2016.

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Shi, H., Chen, L., Malfliet, A. et al. Study of Phase Relations of ZnO-Containing Fayalite Slag Under Fe Saturation. Metall Mater Trans B 47, 2820–2829 (2016). https://doi.org/10.1007/s11663-016-0717-7

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