Effect of Al2O3 on the viscosity of CaO–SiO2–Al2O3–MgO–Cr2O3 slags
来源期刊：International Journal of Minerals Metallurgy and Materials2021年第5期
论文作者：Chen-yang Xu Cui Wang Ren-ze Xu Jian-liang Zhang Ke-xin Jiao
摘 要：We investigated the effect of Al2O3 content on the viscosity of CaO–SiO2–Al2O3–8wt%MgO–1wt%Cr2O3 （mass ratio of CaO/SiO2is 1.0,and Al2O3 content is 17wt%–29wt%） slags.The results show that the viscosity of the slag increases gradually with increases in the Al2O3content 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 k J/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.
Chen-yang Xu1，Cui Wang2，Ren-ze Xu1，Jian-liang Zhang1,2，Ke-xin Jiao1
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing
摘 要：We investigated the effect of Al2O3 content on the viscosity of CaO–SiO2–Al2O3–8wt%MgO–1wt%Cr2O3 （mass ratio of CaO/SiO2is 1.0,and Al2O3 content is 17wt%–29wt%） slags.The results show that the viscosity of the slag increases gradually with increases in the Al2O3content 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 k J/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.
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