Selective Separation of Perovskite (CaTiO<sub>3</sub>) from Titanium Bearing Slag Melt by Super Gravity

Based on the precipitation experiment results of titanium bearing molten slag during cooling liquation, perovskite (CaTiO3) was the first precipitated phase, and 1593–1563 K was the advantageous precipitation temperature of perovskite from the molten simulated slag with a basicity of 1.30. So if perovskite could be separated from the slag melt at this temperature range, at which perovskite becomes a solid state while other minerals form into the molten slag, it would be beneficial for the solid-liquid separation between them. Hence, selective separation experiments of perovskite from titanium bearing slag melt with a basicity of 1.30 at 1578 K by super gravity were carried out in this study, and the results confirmed that it was an effective method. In this process, the molten slag moved along the super gravity direction and went through the filter and then concentrated as the slag phase in the bottom crucible, in which it was practically impossible to find any perovskite grains. In contrast, all the perovskite grains were intercepted by the filter and concentrated as the perovskite phase on the filter, which appeared as the typical dendrite structure. Consequently, after super gravity separation with gravity coefficient of G = 660 to G = 840 at 1578 K for 10 minutes, the mass fraction of TiO2 in the perovskite phase was up to 46.36 wt%, whereas that of the slag phase was only 8.77 wt%. In this case, the recovery ratio of Ti in the perovskite phase was up to 78.17%.