Activity of titanium oxide in CaO–SiO2–Ti3O5 slags at 1600°C

Activity of titanium oxide was determined in CaO–SiO2–Ti3O5 slags in the composition range 25–44% CaO, 30–46% SiO2, 10–39% TiO1.67 at 1600°C using electromotive force method. In the experiments, slags with different titanium oxide contents were equilibrated with liquid iron at 1873 K. Oxygen activity in the iron melt was measured and used with the titanium content in the metal to calculate titanium oxide activity in the slag. According to the results, it was concluded that the activity coefficient of titanium oxide (γ ) is in the range of 0.39 to 1.68 depending on the titanium oxide content and slag basicity. It was evident from the experiments that the activity coefficient increases with the increase in basicity and tends to decrease with increasing SiO2.