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Effects of MgO/Al2O3 Ratio and Basicity on the Viscosities of CaO-MgO-SiO2-Al2O3 Slags: Experiments and Modeling

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Abstract

The effects of the MgO/Al2O3 ratio and basicity on the viscosities of CaO-MgO-SiO2-Al2O3 slags were investigated at 1733 K, 1773 K, and 1823 K (1460 °C, 1500 °C, and 1550 °C) in this study. At a fixed Al2O3 of 15 and 18 mass pct, increasing the basicity from 1 to 1.2 resulted in lowering the viscosity of slags. At a fixed basicity of 1.0 and 1.2, increasing the MgO from 0 to 15 mass pct decreased the viscosity of slags. The Fourier transform-infrared spectra analysis of the slag structure was made to discuss the depolymerization roles of MgO and basicity. Considering the different depolymerization effects of basic oxides upon the silicate/aluminate network structure as suggested by FT-IT analysis, a fresh model for predicting the viscosity of CaO-MgO-SiO2-Al2O3 slags was constructed. A total of 209 viscosity measurements with large compositional variations showed satisfactory agreement with the results calculated by the present model. With the aid of the current model, the co-effects of the MgO/Al2O3 ratio and basicity on the viscosities of CaO-MgO-SiO2-Al2O3 slags (15 to 20 mass pct Al2O3) were investigated.

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. China

    Li Pengcheng (Ph.D. Candidate) & Ning Xiaojun (Associate Professor)

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  1. Li Pengcheng
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  2. Ning Xiaojun
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Correspondence to Li Pengcheng.

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Manuscript submitted May 1, 2015.

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Pengcheng, L., Xiaojun, N. Effects of MgO/Al2O3 Ratio and Basicity on the Viscosities of CaO-MgO-SiO2-Al2O3 Slags: Experiments and Modeling. Metall Mater Trans B 47, 446–457 (2016). https://doi.org/10.1007/s11663-015-0470-3

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  • DOI: https://doi.org/10.1007/s11663-015-0470-3

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