2022 Volume 62 Issue 7 Pages 1341-1351
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.