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Research Article

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

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  • Received: 4 June 2020Revised: 3 September 2020Accepted: 4 September 2020Available online: 5 September 2020
  • The effect of Al2O3 on the viscosity of the CaO-SiO2-Al2O3-8wt% MgO-1wt% Cr2O3 (CaO/SiO2=1.0, Al2O3=17-29wt%) slags was investigated in the present work. The results indicated that the viscosity of the slag increased gradually with the increasing of Al2O3 content within the range of 17 to 29wt%, due to the role of Al2O3 acting as a network former in polymerizing the aluminosilicate structure of the slag. The apparent activation energy of the slags increased from 180.85 to 210.23 kJ/mol with increasing the Al2O3 content from 17 to 29wt%, which was consistent with the variation of the critical temperature. It was indicated that the polymerization degree of the present slag was increased with the addition of Al2O3. The Iida’s model was applied to the prediction of the slag viscosity due to the existence of Cr2O3, and it was found that the calculated viscosity values fitted well with the measured ones when both of the temperature and Al2O3 content were at relatively low level in the present study.
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Effect of Al2O3 on the viscosity of CaO-SiO2-Al2O3-MgO-Cr2O3 slags

  • Corresponding authors:

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

    Jian-liang Zhang    E-mail: zhang.jianliang@hotmail.com

  • 1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • 2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China

Abstract: The effect of Al2O3 on the viscosity of the CaO-SiO2-Al2O3-8wt% MgO-1wt% Cr2O3 (CaO/SiO2=1.0, Al2O3=17-29wt%) slags was investigated in the present work. The results indicated that the viscosity of the slag increased gradually with the increasing of Al2O3 content within the range of 17 to 29wt%, due to the role of Al2O3 acting as a network former in polymerizing the aluminosilicate structure of the slag. The apparent activation energy of the slags increased from 180.85 to 210.23 kJ/mol with increasing the Al2O3 content from 17 to 29wt%, which was consistent with the variation of the critical temperature. It was indicated that the polymerization degree of the present slag was increased with the addition of Al2O3. The Iida’s model was applied to the prediction of the slag viscosity due to the existence of Cr2O3, and it was found that the calculated viscosity values fitted well with the measured ones when both of the temperature and Al2O3 content were at relatively low level in the present study.

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