Effect of Al2O3 on the viscosity of CaO–SiO2–Al2O3–MgO–Cr2O3 slags

Chen-yang Xu; Cui Wang; Ren-ze Xu; Jian-liang Zhang; Ke-xin Jiao

doi:10.1007/s12613-020-2187-9

Volume 28 Issue 5

May 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(5): 797-803

Chen-yang Xu, Cui Wang, Ren-ze Xu, Jian-liang Zhang, and Ke-xin Jiao, Effect of Al₂O₃ on the viscosity of CaO–SiO₂–Al₂O₃–MgO–Cr₂O₃ slags, Int. J. Miner. Metall. Mater., 28(2021), No. 5, pp. 797-803. https://doi.org/10.1007/s12613-020-2187-9

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Chen-yang Xu, Cui Wang, Ren-ze Xu, Jian-liang Zhang, and Ke-xin Jiao, Effect of Al2O3 on the viscosity of CaO–SiO2–Al2O3–MgO–Cr2O3 slags, Int. J. Miner. Metall. Mater., 28(2021), No. 5, pp. 797-803. https://doi.org/10.1007/s12613-020-2187-9

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Research Article

Effect of Al₂O₃ on the viscosity of CaO–SiO₂–Al₂O₃–MgO–Cr₂O₃ slags

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Corresponding authors:
Ren-ze Xu E-mail: xurenze2010@163.com

Jian-liang Zhang E-mail: zhang.jianliang@hotmail.com
Received: 4 June 2020; Revised: 3 September 2020; Accepted: 4 September 2020; Available online: 5 September 2020

Abstract

Abstract

We investigated the effect of Al₂O₃ content on the viscosity of CaO–SiO₂–Al₂O₃–8wt%MgO–1wt%Cr₂O₃ (mass ratio of CaO/SiO₂ is 1.0, and Al₂O₃ content is 17wt%–29wt%) slags. The results show that the viscosity of the slag increases gradually with increases in the Al₂O₃ content in the range of 17wt% to 29wt% due to the role of Al₂O₃ as a network former in the polymerization of the aluminosilicate structure of the slag. With increases in the Al₂O₃ content from 17wt% to 29wt%, the apparent activation energy of the slags also increases from 180.85 to 210.23 kJ/mol, which is consistent with the variation in the critical temperature. The Fourier-transform infrared spectra indicate that the degree of polymerization of this slag is increased by the addition of Al₂O₃. The application of Iida’s model for predicting the slag viscosity in the presence of Cr₂O₃ indicates that the calculated viscosity values fit well with the measured values when both the temperature and Al₂O₃ content are at relatively low levels, i.e., the temperature range of 1673 to 1803 K and the Al₂O₃ content range of 17wt%–29wt% in CaO–SiO₂–Al₂O₃–8wt%MgO–1wt%Cr₂O₃ slag.
- slag;
- viscosity;
- high aluminium oxide;
- apparent activation energy;
- structure;
- viscosity prediction

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