期刊
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
卷 75, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.calphad.2021.102348
关键词
Phase diagram; CaO-Gd2O3-SiO2 system; Thermodynamic modeling; CALPHAD
类别
资金
- Academician Free Exploration Fund of Yunnan Province, China [2020HA006]
- Top young talents of Yunnan ten thousand talents plan [109720190004]
The thermodynamic properties of the CaO-Gd2O3-SiO2 ternary system were successfully described through experimental data and thermodynamic modelling, with the modelling ternary phase equilibria showing good agreement with literature experimental data.
To prove the feasibility of pyrometallurgical recovery of the rare earth elements, it is necessary to understand the thermodynamic properties of related rare earth oxides containing systems. Based on the experimental data as well as thermodynamic modelling of the silicate subsystems, a thermodynamic description of CaO-Gd2O3-SiO2 ternary system is constructed. The Gibbs energy of the liquid phase is modeled by the Modified Quasichemical Model. The solid phases are modeled by the polynomial expansions of the excess Gibbs energy. The present modelling ternary phase equilibria are in good agreement with the experimental data in the literature.
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