Effects of Al2O3 and CaO/SiO2 ratio on phase equilbria in the ZnO-"FeO"-Al2O3-CaO-SiO2 system in equilibrium with metallic iron

The phase equilibria and liquidus temperatures in the ZnO-"FeO"- AlO-CaO-SiO system in equilibrium with metallic iron have been determined experimentally in the temperature range 1383 K to 1573 K (1150 °C to 1300 °C). The experimental conditions were selected to characterize lead blast furnace and imperial smelting furnace slags. The results are presented in a form of pseudoternary sections ZnO-"FeO"-(AlO + CaO + SiO) with fixed CaO/SiO and (CaO + SiO)/AlO ratios. It was found that wustite and spinel are the major primary phases in the composition range investigated. Effects of AlO concentration as well as the CaO/SiO ratio on the primary phase field, the liquidus temperature, and the partitioning of ZnO between liquid and solid phases have been discussed for zinc-containing slags