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A Structural Study on the Foaming Behavior of CaO-SiO2-MO (MO = MgO, FeO, or Al2O3) Ternary Slag System

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Abstract

The foaming index of the CaO-SiO2-MO (MO = MgO, FeO, or Al2O3) ternary slag system with a fixed CaO/SiO2 ratio is measured to understand the effect of the ionic structure. At 1773 K (1500 °C), the foaming index of the slag increases with Al2O3 addition and decreases with MgO or FeO addition at a fixed CaO/SiO2 ratio. It is verified that the previous correlation between the foaming index and the physical properties could also be valid for the CaO-SiO2-(MgO or Al2O3) system. Raman spectroscopy for the CaO/SiO2 = 1.0 slag is applied to explain the foaming behavior from an ionic structural perspective. From the ionic structural viewpoint, the fractional change in each silicate anion unit is identified by de-convoluted Raman spectra. The Raman spectra indicate that the silicate network structure is polymerized with Al2O3 as an aluminosilicate structure; in contrast, de-polymerization occurs by MgO or FeO addition. Furthermore, the relationship between the silicate structure and the thermodynamic stability function is discussed. Since the ionic structure of the molten slag affects various physical/thermodynamic properties, the foaming behavior could be successfully interpreted from the ionic structural viewpoint.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Yonsei University, Yonsei-ro50, Seodaemun-gu, Seoul, 03722, Korea

    Youngjoo Park & Dong Joon Min

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  1. Youngjoo Park
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  2. Dong Joon Min
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Correspondence to Dong Joon Min.

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Manuscript submitted April 17, 2017.

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Park, Y., Min, D.J. A Structural Study on the Foaming Behavior of CaO-SiO2-MO (MO = MgO, FeO, or Al2O3) Ternary Slag System. Metall Mater Trans B 48, 3038–3046 (2017). https://doi.org/10.1007/s11663-017-1079-5

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  • DOI: https://doi.org/10.1007/s11663-017-1079-5

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