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Interfacial Tension in the CaO-Al2O3-SiO2-(MgO) Liquid Slag–Solid Oxide Systems

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Abstract

Interfacial phenomenon is critical in metal processing and refining. While it is known to be important, there are little data available for key oxide systems in the literature. In this study, the interfacial tension (σ LS) of liquid slag on solid oxides (alumina, spinel, and calcium aluminate), for a range of slags in the CaO-Al2O3-SiO2-(MgO) system at 1773 K (1500 °C), has been evaluated. The results show that basic ladle-type slags exhibit lower σ LS with oxide phases examined compared to that of acid tundish-type slags. Also, within the slag types (acid and base), σ LS was observed to decrease with increasing slag basicity. A correlation between σ LS and slag structure was observed, i.e., σ LS was found to decrease linearly with increasing of slag optical basicity (Λ) and decrease logarithmically with decreasing of slag viscosity from acid to base slags. This indicated a higher σ LS as the ions in the slag become larger and more complex. Through a work of adhesion (W) analysis, it was shown that basic ladle slags with lower σ LS result in a greater W, i.e., form a stronger bond with the solid oxide phases examined. This indicates that all other factors being equal, the efficiency of inclusion removal from steel of inclusions of similar phase to these solid oxides would be greater.

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Acknowledgments

The authors acknowledge the support of BlueScope and the use of the Australian Research Council funded JEOL-JSM6490 LV SEM at the UOW Electron Microscopy Centre.

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Authors and Affiliations

  1. PYROmetallurgical Research Group, School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, NSW, 2522, Australia

    Hamed Abdeyazdan, Brian J. Monaghan & Raymond J. Longbottom

  2. Department of Mechanical and Product Design Engineering, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia

    M. Akbar Rhamdhani

  3. Department of Materials Science and Engineering, McMaster University, Hamilton, ON, L8S 4L7, Canada

    Neslihan Dogan

  4. BlueScope Ltd., Port Kembla, NSW, 2505, Australia

    Michael W. Chapman

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  1. Hamed Abdeyazdan
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  2. Brian J. Monaghan
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Correspondence to Hamed Abdeyazdan.

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Manuscript submitted January 18, 2017.

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Abdeyazdan, H., Monaghan, B.J., Longbottom, R.J. et al. Interfacial Tension in the CaO-Al2O3-SiO2-(MgO) Liquid Slag–Solid Oxide Systems. Metall Mater Trans B 48, 1970–1980 (2017). https://doi.org/10.1007/s11663-017-0978-9

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