About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fundamentals of Sustainable Metallurgy and Processing of Materials
|
| Presentation Title |
The Effect of MgO Addition to CaO-SiO₂-Al₂O₃ Slag Composition during Electric-Enhanced Silicon Refining |
| Author(s) |
Andreas D. P. Putera, M. Akbar Rhamdhani |
| On-Site Speaker (Planned) |
M. Akbar Rhamdhani |
| Abstract Scope |
Molten oxides are able to conduct electricity, and some solid solutions are more conductive than the others, especially spinel formations. Experiments on the removal of B from molten silicon with CaO-SiO₂-Al₂O₃ and MgO slags under Ar atmosphere at 1500°C with electrical current flow between the two phases are presented in this study. MgO was introduced in the slag because its ability to stimulate spinel growth with aluminum oxide present in the slag (MgAl₂O₄). Under constant electricity current of 1.25 A, the potential difference between in the CaO-SiO₂-Al₂O₃ slag was varied between 4.0 to 6.0 V, whereas with MgO addition the potential difference was stable and lowered to 3.2 V. The presence of MgO, and ultimately spinel, in the molten slag can lower the viscosity of the molten slag, as well as enhances the electrical conductivity of the slag, giving a higher current efficiency to the system. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Electrometallurgy, Pyrometallurgy |