Abstract
Optimization of the phase diagram of FcO-V2O3 system is a part of an on-going research project to develop a self-consistent multi-component thermodynamic database for vanadium slag from hot metal. Due to the lack of experimental data for optimization, a novel experimental investigation has been carried out by thermal analysis (DSC) with a series of slags on different V2O3 contents (i.e. 3mass %–12mass%). All available thermodynamic and phase diagram data for the binary systems have been simultaneously optimized with CALPHAD (Calculation of Phase Diagrams) methods to give one set of model equations for the Gibbs free energy of the liquid slag as functions of composition and temperature. The modified quasi-chemical model was used to describe the binary slag system. It was demonstrated that the calculated phase diagram with the optimized parameters was in good agreement with the experimental data.
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