Phase equilibria in the ZnO-“FeO”-SiO2-CaO system at Po2 10−8 atm

Experimental investigations on the phase equilibria in the ZnO-“FeO”-SiO2-CaO system have been carried out with 2, 4 and 6 wt pct CaO at 1523, 1543 and 1573 K under Po2 10−8 atm. The experimental techniques involve high-temperature equilibration, quenching and electron probe X-ray microanalysis. The results indicate that when CaO content in the liquid phase increases, the liquidus temperature increases in the spinel primary phase field and decreases in the SiO2 primary phase field. The partitioning of ZnO shows that ZnO concentration in the liquid phase is higher than that in the spinel phase. The phase equilibrium information can be used to assist the industry processes and also for the development of the thermodynamic database.