Abstract
Liquidus phase equilibrium data of the present authors for the CaO–ZnO–SiO2 system (as a part of research program on the characterization of the multicomponent PbO–ZnO–FeO–Fe2O3-“Cu2O”-CaO-SiO2 system), combined with phase equilibrium and thermodynamic data from the literature, have been used to obtain a self-consistent set of parameters of the thermodynamic models for all phases. The modified quasichemical model is used for the liquid slag phase; lime (Ca,Zn)O, zincite (Zn,Ca)O, α- and α′-dicalcium silicate (Ca,Zn)2SiO4 and tricalcium silicate (Ca,Zn)3SiO5 are described within Bragg-Williams formalism; tridymite, cristobalite SiO2, wollastonite, pseudowollastonite CaSiO3, rankinite Ca3Si2O7, willemite Zn2SiO4, melilite (hardystonite) Ca2ZnSi2O7 and Ca–Zn feldspar CaZnSi3O8 are treated as stoichiometric compounds. From these model parameters, the optimized ternary phase diagram is back calculated.
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