Thermodynamics Of Titanium Oxide In Cao-sio_2-al_2o_3-mgo_satd-caf_2 Slag Equilibrated Withfe-11mass%cr Melt

摘要

Thermodynamic equilibrium between the CaO-SiO_2-Al_2O_3-MgO_satd-CaF_2(-TlO_x) slags and the Fe-11mass%Cr melt was investigated at 1 873 K in order to understand the thermodynamic behavior of titanium oxide in the refining slags. The equilibrium between silicon and titanium in steel melts and their oxides in the slags are theoretically expected and experimentally proved well. The activity coefficient of TiO_2 increases by increasing the basicity in logarithmic scale. By combining this with the previous results, in multi component calcium(-magnesium) silicate slags containing Al_2O_3 and TiO_2, TiO_2 could be considered as a basic oxide in silicate base melts, while it could be the relatively acidic oxide in the aluminate (very low silica) base melts. The activity coefficient of TiO_2 gradually decreases by substituting silica for alumina, indicating that the attraction between TiO_2 and SiO_2 is greater than that between TiO_2 and Al_2O_3 in the present slag system. This could be explained from the electronegativity difference between each cation involved. The activity of TiO_2 in the 10%MgO slag system shows a negative deviation from an ideality, while that in the CaO-SiO_2-Al_2O_3-MgO_satd(-CaF_2) system is relatively close to the ideal behavior up to about 10mol% TiO_2. This is mainly due to the relatively basic characteristic of TiO_2.