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Published on: February 8, 2018
Thermodynamic Assessment of CaO-Al2O3-Fe2O3 System
Wenqing Zhao1, Lideng Ye1, Junfeng Wu1
1School of Materials Science and Engineering, Central South University, Changsha 410083, China.
Abstract:
The CaO-Al2O3-Fe2O3 system is widely encountered in cement production, iron ore sintering, metallurgical slags, and refractory materials. A thermodynamic assessment of the CaO-Fe2O3 and CaO-Al2O3-Fe2O3 systems was carried out in this study based on the CALculation of PHAse Diagrams (CALPHAD) method. The liquid was modeled using the ionic two-sublattice model, expressed as (Ca+2, Al+3, Fe+2) P (O-2, AlO1.5, FeO1.5, Va, O) Q. The Compound Energy Formalism (CEF) was adopted to describe compounds and solid solutions. A self-consistent thermodynamic assessment of the CaO-Fe2O3 and CaO-Al2O3-Fe2O3 systems was achieved, enabling accurate reproduction of phase equilibrium and thermodynamic data. The obtained thermodynamic description provides a useful foundation for the design, optimization, and processing of refractory materials.
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