Abstract
The utilization of rare earth resources, especially secondary resources (e.g., RE-oxide system slag), has been limited by the lack of thermodynamic information. In order to supplement and refine the thermodynamic data related to rare earth, the equilibrium experiments of SiO2-Ce2O3-CaO-25wt.% Al2O3 system phase diagram were carried out at 1773 K by the high-temperature isothermal equilibration/quenching technique in the current paper. The composition of seven phase regions was determined by FE-SEM, XRD, EPMA, and XRF analysis on the samples obtained by high-temperature equilibrium technology at 1773 K, including the primary crystal regions of three compounds (C2AS, 2CaO·SiO2, and CaO·2Ce2O3·3SiO2), three three-phase coexistence regions (L + C2AS + 2CaO·SiO2, L + C2AS + CaO·2Ce2O3·3SiO2, and L + CaO·2Ce2O3·3SiO2 + CeAl11O18), and a liquid region. The phase relations and isotherms of SiO2-Ce2O3-CaO-25wt.% Al2O3 system obtained in current work are beneficial to the recycling of rare earth resources containing cerium.
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Li, R., Li, M., Zhang, T., Wang, W. (2023). Phase Equilibria of SiO2-Ce2O3-CaO-25wt.% Al2O3 System at 1773 K. In: Li, B., et al. Advances in Powder and Ceramic Materials Science 2023. TMS 2023. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-031-22622-9_7
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