Effect of Simultaneous Addition of Al2O3 and MgO on the Liquidus of the CaO–SiO2–FeOx System with Various Oxygen Partial Pressures at 1573 K

To investigate the effect of simultaneous addition of Al2O3 and MgO on the liquid phase area for the CaO–SiO2–FeOx system, liquidus for the CaO–SiO2–FeOx–2.5mass%Al2O3–2.5mass%MgO system were measured at 1573 K with various oxygen partial pressures by using chemical equilibration technique. By the addition of Al2O3 and MgO to the CaO–SiO2–FeOx system, the liquid phase area enlarges with the oxygen partial pressure of 1.8×10−3 Pa. The liquid phase area separates into two liquid phase areas with the oxygen partial pressure of 0.18 Pa. The liquid phase area shrinks at low SiO2 region with the oxygen partial pressure of 2.1×102 Pa.