Abstract
Sustainable utilization of Sc2O3 in the bauxite ore residues has recently attracted significant interest in industries and research community. However, few thermodynamic and experimental data has been reported for Sc2O3 systems, which greatly limits the sustainable utilization of Sc2O3 in the bauxite ore residues. This study was carried out to develop an understanding of the phase equilibria of the Al2O3-SiO2-Sc2O3 ternary system and furnish essential information for the recovery of Sc2O3 from the bauxite ore residues. Therefore, a combined thermodynamic assessment and experimental investigation were performed for the Al2O3-SiO2-Sc2O3 ternary system. The phase equilibria of the ternary system based on Al2O3-SiO2-Sc2O3 was established at 1773 K and 1873 K using a thermodynamic equilibrium experiment. The obtained experimental results and findings from a systemic literature survey were utilized for the thermodynamic assessment to arrive at a thermodynamic data set pertaining to the Al2O3-SiO2-Sc2O3 system. Based on the thermodynamic data obtained in the study, isothermal sections at 1773 K and 1873 K were computed, and subsequently, a comparison was made with the available experimental data. The theoretical calculations corroborated quite well with the experimental findings, thereby demonstrating that the current thermodynamic data is credible and self-consistent.
Published Version
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