Phase composition and liquidus temperatures of the CaO–SiO2–MgO-13 wt%Al2O3–TiO2 system in reduction conditions.

Effects of TiO 2 , binary basicity and MgO content on the liquidus temperatures of TiO 2 –CaO–SiO 2 –MgO–Al 2 O 3 slags were experimentally studied in equilibrium with carbon. The experimental techniques include high temperature equilibration, quenching and Electron Probe X-ray Microanalysis (EPMA). It was found that the major primary phase in the composition range investigated is M 3 O 5 (M = Ti, Mg, Al). The liquidus temperatures increase with increasing TiO 2 and MgO contents, whereas decrease with increasing CaO/SiO 2 mass ratio. The experimentally determined liquidus temperatures are much higher than the predicted ones by FactSage and the primary phases between the experiment results and predictions are also different. The mole fractions of Al 2 TiO 5 and Ti 3 O 5 in the M 3 O 5 phase decrease, but MgTi 2 O 5 increases with increasing MgO content and CaO/SiO 2 in the samples. Moreover, the proportions of Al 2 TiO 5 and MgTi 2 O 5 in the M 3 O 5 phase decrease, while Ti 3 O 5 proportion in the M 3 O 5 phase increases with increasing the reaction time. The mole ratio of Ti3+/Ti4+ in the M 3 O 5 phase decreases with MgO content and CaO/SiO 2 mass ratio in the samples but increases with increasing reaction time. [ABSTRACT FROM AUTHOR]