Experimental study and thermodynamic re-optimization of the FeO-Fe2O3-SiO2 system

Phase equilibria and thermodynamic data in the FeO-FeO-SiO system were critically reviewed. New experiments were undertaken to resolve discrepancies found in previous data. The liquid oxide/slag phase was described using the modified quasichemical model. New optimized parameters of the thermodynamic models for the Gibbs energies of slag and other phases in the selected system were obtained. The new parameters reproduce all available phase equilibria and thermodynamic data within the experimental error limits from 298\ua0K (25\ua0°C) to above the liquidus temperatures at all compositions and oxygen partial pressures from metal saturation to 1\ua0atm of O. This study was carried out as part of the development of a self-consistent thermodynamic database for the Al-Ca-Cu-Fe-Mg-Si-O-S multi-component system