Activity Measurement of CaO–SiO₂–AlO_1.5–MgO Slags Equilibrated with Molten Silicon Alloys

抄録

The activities of components in the CaO–SiO₂ –AlO_1.5 –MgO slags at 1823 and 1873 K were directly measured by equilibrating the slags with Si based alloys.
For the CaO–SiO₂, CaO–SiO₂ –AlO_1.5 and CaO–SiO₂ –MgO systems, thermodynamic properties of Si based alloys and the activity data of SiO₂ obtained from the distribution of each element between slags and the alloys in the previous paper were used to derive the activities of AlO_1.5, CaO and MgO. For the CaO–SiO₂ –AlO_1.5 –MgO quaternary system, the activities of components other than SiO₂ on the 10 mass% MgO plane were determined at 1873 K by employing the SiO₂ activities available in the literature.
Accordingly, it was confirmed that the activities of components other than SiO₂ in multi-component silicate slag systems can be determined by this technique as long as the activity datum of at least one component in the systems is available.