Phase Transition Behavior of Rare Earth Oxide Ce2O3 in CaO–SiO2–5wt.% Al2O3 System at 1673–1873 K

Based on previous phase diagram studies on the CaO-SiO2-Ce2O3-5wt.% Al2O3 system at 1673–1773 K. In this study, the equilibrium phase diagram experiment at 1873 K was extended. The phase composition and phase ratio were analyzed and statistically calculated by FE-SEM, XRDX-ray diffraction (XRD), EPMA, and XRF, so the equilibrium phase diagram of CaO-SiO2-Ce2O3-5wt.% Al2O3 at 1873 K was obtained. At this high temperatureHigh temperature, the phases coexisting with the liquid phase are CaO·2Ce2O3·3SiO2, SiO2, Ca2SiO4, and Ce2Si2O7. In addition, the liquid phase region and the initial crystal point at the temperatureTemperature of 1673–1873 K in CaO-SiO2-Ce2O3-5wt.% Al2O3 system were plotted. The precipitationPrecipitation and phase transformationPhase transformations behavior of rare earthRare earth oxide Ce2O3 in CaO-SiO2-Al2O3 are explained in detail, which provides a theoretical basis for the value-added utilizationUtilization of rare earthRare earth oxides.