Experimental study and thermodynamic optimization of the ZnO–FeO–Fe2O3–CaO–SiO2 system AITranslate

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DOI：https://doi.org/10.1016/j.calphad.2020.102011

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Liquidus phase equilibrium experimental data from the present study for the ZnO-“Fe2O3”-CaO-SiO2 system in air, combined with phase equilibria and thermodynamic data from the literature on the ZnO-“Fe2O3”-CaO system in air and ZnO-“FeO”-CaO-SiO2 system in equilibrium with metallic Fe, have been used to obtain a self-consistent set of parameters of the thermodynamic models for all phases in the ZnO–FeO–Fe2O3–CaO–SiO2 system. The modified quasichemical model is used for the liquid slag phase; spinel (Fe,Zn,Ca)tetr (Fe,Zn,Ca,Va)oct2O4, melilite Ca2(Fe2+,Fe3+,Zn)(Fe3+,Si)2O7 and olivine (Fe,Zn,Ca)I(Fe,Zn,Ca)IISiO4 are described with compound energy formalism; lime and wustite (monoxide) (Ca,Fe,Zn)O, zincite (Zn,Fe,Ca)O1+x, calcium-zinc ferrites Ca2Fe2O5-“CaZnO2” and CaFe4O7-“ZnFe4O7”, α- and α′-dicalcium silicate (Ca,Fe,Zn)2SiO4 and tricalcium silicate (Ca,Fe,Zn)3SiO5 and silicoferrite of calcium (SFC) Ca9Fe46SiO80–Ca12Fe40Si4O80 are described within Bragg-Williams formalism; for other phases, previous assessments have been adopted. The phase diagrams are back calculated with the optimized model parameters. Present study is a part of research program on the characterization of the multicomponent PbO–ZnO–FeO–Fe2O3-“Cu2O”-CaO-SiO2 system.