SiO2-TiO2-CaO-MgO-FeO-MnO Slag System and Thermodynamic Model of Ti-Si Equilibrium in Titanium Removing Process

In order to decrease titanium content in hot metal, a method of removing titanium in hot metal using sinter or pellet has been invented. An activity model of titanium in SiO2-TiO2-CaO-MgO-FeO-MnO slag system was built using software Matlab basing on the coexistence theory. The calculation result shows that the activity of TiO2 will decrease with the increase of MgO, FeO and MnO mole fraction and the increase of basicity. At the same time, it also grows up when the TiO2 mole fraction increases. Final titanium content in titanium removal process is proportional to the silicon content in hot metal. The proportional coefficient can be affected by temperature, metal content and the activities of SiO2 and TiO2 in slag. The calculated results meet with the experimental and industrial data.