| Title |
Phase Equilibria of the CaO-SiO2-CeO2-Al2O3-MgO System at 1300°C and 1400°C |
| ID_Doc |
10242 |
| Authors |
Shi, JJ; Zhai, YM; Qiu, YC; Jiang, CL; Hou, CL; Dong, JJ; Li, JZ |
| Title |
Phase Equilibria of the CaO-SiO2-CeO2-Al2O3-MgO System at 1300°C and 1400°C |
| Year |
2024 |
| Published |
Jom, 76, 8 |
| Abstract |
The recovery of rare-earth elements (REEs) from rare-earth blast furnace slag (RE-BFS) is crucial for advancing the circular economy. However, the development of related processes is significantly hindered by the severe lack of fundamental thermodynamic data on REE systems, underscoring the urgent need for detailed studies in this area. In the present work, the equilibrium phase relations of CaO-SiO2-CeO2-10.0 wt.% Al2O3-5.0 wt.% MgO system at 1300 degrees C and 1400 degrees C were experimentally carried out using the high-temperature equilibration-quenching technique followed by X-ray diffraction (XRD), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), and X-ray photoelectron spectroscopy (XPS), as well as thermodynamic calculation. One liquidus region, a liquid-CeO2 two-phase coexisting region, and a liquid-CeO2-akermanite three-phase coexisting region were confirmed within the investigated composition ranges. Based on the experimental data and phase compositions, the phase diagram of the CaO-SiO2-CeO2-10.0 wt.% Al2O3-5.0 wt.% MgO system was constructed at 1300 degrees C and 1400 degrees C. There were great discrepancies between the experimental results and calculated results by FactSage 8.2. The phase equilibria data obtained from this study provide fundamental thermodynamic information for the development of innovative processes aimed at extracting REEs from RE-BFS, as well as enriching the existing REEs database. |
| PDF |
|
