Electrical Conductivity of Molten Slags of CaF2+Al2O3 and CaF2+Al2O3+CaO Systems for ESR
Wei Chiho, Xiang Shunhua
The electrical conductivity of the molten slags of the CaF2+Al2O3 and CaF2+Al2O3+CaO systems for the practical ESR was determined, using the constant-current single pulse technique with three lead-electrodes. All the measurements were carried out under high-purity argon atmosphere, employing a high-purity molybdenum metal crucible with pure iron wire electrodes. The effects of FeO, MnO, MgO, Cr2O3, TiO2, SiO2 and other oxide components and temperature on the conductivity of the slags were examined. The results indicated that in the common concentration ranges for the ESR practice, the specific conductivity values of the slags in these two systems are monotonously increasing with the FeO and MnO contents in the slags following an essentially similar pattern; the additions of MgO, Cr2O3 and TiO2 change also evidently the conductivity but in another roughly similar mode and make it have a maximum value, whilst the influence due to a small amount of SiO2 (≤1.5 mass%) is relatively not large; the conduction of CaF2-based multi-component and complicate liquid slags may be treated as a rate process.