8th International Congress on Science and Technology of Ironmaking - ICSTI 2018

High temperature experiments have been undertaken using equilibration, quenching and EPMA technique to characterise the phase equilibria of high Ti-containing slag systems. The experimental results have been presented in the form of pseudo-binary sections to show the effects of CaO, TiO2 and oxygen partial pressure on liquidus temperatures. The primary phases observed in the composition range investigated include pseudobrookite M3O5 (MgO.2TiO2 – Al2O3.TiO2), spinel MgO.(Al3+,Ti3+)2O3, perovskite CaTiO3 and rutile TiO2. The liquidus temperatures were found to decrease in the TiO2 and M3O5 primary phase fields with increasing CaO concentration and increase in the spinel and CaTiO3 primary phase fields with increasing CaO concentration. The experimentally determined liquidus temperatures were found to be in general significantly higher than those predicted by FactSage model. Experimental data and FactSage predictions show that the liquidus temperatures under reducing conditions are higher than those in air.