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

Abstract

To investigate the effect of simultaneous addition of Al₂O₃ and MgO on the liquid phase area for the CaO–SiO₂–FeO_x system, liquidus for the CaO–SiO₂–FeO_x–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–FeO_x 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.