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Coupled Experimental Study and Thermodynamic Optimization of the K2O-MgO and K2O-MgO-SiO2 Systems

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Abstract

Key phase diagram experiments were conducted to reveal the phase diagram of the K2O-MgO system using thermal analysis and equilibration techniques with sealed platinum capsules. The peritectic reaction of liquid + MgO → K6MgO4 was determined at 1131 K ± 14 K (858 °C ± 14 °C) for the first time. Based on the critical evaluation of all the literature data and the present experimental results, the thermodynamic optimizations of the K2O-MgO and K2O-MgO-SiO2 systems were performed to obtain a set of model parameters describing the Gibbs energies of all phases in the ternary systems. All reliable phase diagrams and thermodynamic properties of the K2O-MgO and K2O-MgO-SiO2 systems were well reproduced from the optimization. The optimized set of the Gibbs energies of all phases can be used to calculate any unexplored phase diagrams and thermodynamic properties in the system.

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Acknowledgments

Financial supports from Tata Steel Europe, POSCO, Nucor Steel, Rio Tinto Iron and Titanium, Hyundai Steel, Nippon Steel, and Sumitomo Metals Corp., JFE Steel, Voestalpine, RHI, and the Natural Sciences and Engineering Research Council of Canada are gratefully acknowledged. Authors (D.-G. Kim and B. Konar) also acknowledge the McGill Engineering Doctorate Award (MEDA) from McGill University.

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  1. Department of Mining and Materials Engineering, McGill University, 3610 University St., Montreal, QC, H3A 0C5, Canada

    In-Ho Jung

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  1. Dong-Geun Kim
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  2. Bikram Konar
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  3. In-Ho Jung
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Correspondence to In-Ho Jung.

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Manuscript submitted March 12, 2017.

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Kim, DG., Konar, B. & Jung, IH. Coupled Experimental Study and Thermodynamic Optimization of the K2O-MgO and K2O-MgO-SiO2 Systems. Metall Mater Trans B 48, 2788–2803 (2017). https://doi.org/10.1007/s11663-017-1038-1

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