Phase Equilibria in the TiO₂-Rich Part of the TiO₂-CaO-SiO₂-10 Wt Pct Al₂O₃-5 Wt Pct MgO System at 1773 K

The phase equilibria of the TiO₂-CaO-SiO₂-10 wt pct Al₂O₃-5 wt pct MgO system in the TiO₂-rich part were investigated experimentally at 1773 K using the high-temperature equilibration–quenching method and the electron probe microanalyses. Through this study, the isothermal section of the above system was obtained containing one liquidus region and five solid–liquid coexistence regions. The primary phase region of anosovite was not only found, but it is the optimal composition region that is most beneficial to the anosovite selective crystallization and separation. The phase diagram of the TiO₂-CaO-SiO₂-10 wt pct Al₂O₃-5 wt pct MgO system in the TiO₂-rich corner at 1773 K has been established. The obtained phase diagram can provide reliable reference for the slag adjusting during vanadium-titanium magnetites smelting to make sure the resulting Ti-bearing slag can be upgraded using the selective crystallization and phase separation method.