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Activity of SiO2 in CaO–SiO2–Al2O3 Molten Slags Containing CaF2 or B2O3 at 1450 °C

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Abstract

To understand the thermodynamic characteristics of the reaction between Al and SiO2 for the continuous casting process of high-aluminum steel, the activity coefficients of SiO2 and MnO in molten slag of CaO–SiO2–Al2O3–(2 to 3) mass pct MgO-(< 2 mass pct) MnO slags containing CaF2 or B2O3 were measured at 1450 °C by experiments of Si and Mn equilibrium between liquid copper and molten slag in a graphite crucible under the mixed gas atmosphere of CO and Ar. The effects of SiO2, Al2O3, CaF2, and B2O3 and the basicity on the activity coefficients of SiO2 and MnO in molten slag were discussed. The relationships between the activity coefficients of SiO2 and MnO and the concentrations of components in slag were analyzed by the regression analysis method. The results show that the activity coefficients of both SiO2 and MnO decreased with an increase in the SiO2 and Al2O3 content but increased with an increase in the CaF2 and B2O3 content and the basicity.

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Acknowledgments

The authors expresses their gratitude to the funding support by National Natural Science Foundation of China (No. 51874198).

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  1. School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 201418, P.R. China

    Jian-Bin Chen, Wen-Bo Pan, Hong-Hong Huang, Zhi-Yu Chen, Ming-Hui Zhao & Ya-Qin Sun

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Chen, JB., Pan, WB., Huang, HH. et al. Activity of SiO2 in CaO–SiO2–Al2O3 Molten Slags Containing CaF2 or B2O3 at 1450 °C. Metall Mater Trans B 53, 1526–1537 (2022). https://doi.org/10.1007/s11663-022-02462-0

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