Experimental Study on Thermodynamics of CaO–SiO₂–Ce₂O₃–5wt.% Al₂O₃ System at 1773 K

The liquidus temperature and relative equilibrium system of Ce containing system have important basic guiding role for comprehensive utilization of rare earth Ce resources, while the lack of thermodynamic information seriously restricts the application of rare earth in steel. The phase equilibrium relationship of CaO–SiO₂–Ce₂O₃–5wt.% Al₂O₃ phase diagram system, which was carried out at 1773 K, and was analyzed by X-Ray Diffraction (XRF), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), Energy Disperse Spectroscopy (EDS) and Electro-Probe Microanalyzer (EPMA) was studied in this paper. The isotherms and phase relations of CaO–SiO₂–Ce₂O₃–5wt.% Al₂O₃ system related to the Ce slag system containing rare earth elements were obtained at 1773 K. And the phase equilibrium data obtained in current work can provide the basis for the control of rare earth inclusions in molten steel and the optimization of relevant thermodynamic database, and provide the theoretical basis for the sustainable utilization of rare earth resources containing cerium.