Thermodynamic Activity of SiO2 in CaO–SiO2–Al2O3–MnO–MgO System Molten Slags

To understand the thermodynamic characteristics of the reaction between Al and SiO2 during the continuous casting process of the high-aluminum steel, the activity coefficients of SiO2 and MnO in molten slags of (18–43%) CaO-(33–64%) SiO2-(9–21%) Al2O3-(2–3%) MgO-(<2.4%) MnO were measured at 1400°...

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Bibliographic Details
Published inISIJ International Vol. 62; no. 7; pp. 1341 - 1351
Main Authors Chen, Jian-Bin, Luan, Huai-Zhuang, Huang, Hong-Hong, Zhao, Ming-Hui, Pan, Wen-Bo, Chen, Zhi-Yu
Format Journal Article
LanguageEnglish
Published The Iron and Steel Institute of Japan 15.07.2022
Subjects
activity
activity coefficient
high aluminum steel
MnO
mold flux
SiO2
slag
thermodynamics
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Summary:To understand the thermodynamic characteristics of the reaction between Al and SiO2 during the continuous casting process of the high-aluminum steel, the activity coefficients of SiO2 and MnO in molten slags of (18–43%) CaO-(33–64%) SiO2-(9–21%) Al2O3-(2–3%) MgO-(<2.4%) MnO were measured at 1400°C, 1450°C and 1500°C by the experiments of the Si and Mn equilibrium between liquid copper and molten slag in the graphite crucible under the mixed gas atmosphere of CO and Ar. The effects of SiO2, Al2O3, the basicity, the radio of CaO/Al2O3 and the temperature on the activity coefficients of SiO2 and MnO in molten slag were discussed. The quadratic regression relationships among the activity coefficient of SiO2 or MnO, the concentration of component, the basicity and the temperature were investigated by the regression analysis method.
ISSN:0915-1559
1347-5460
DOI:10.2355/isijinternational.ISIJINT-2022-018