Abstract:A large number of titanium bearing slag is produced in the process of steel smelting with the application of titanium protecting material and titanium bearing iron ore, while the depth development of titanium resource comprehensive utilization technology is limited due to the lack of thermodynamic data of multi-component titanium bearing slag system. Using the modified molecular interaction volume model (M-MIVM (FII)), the activity of each component in Al2O3-CaO-SiO2, FeO-MnO-SiO2, FeO-MnO-TiO2, FeO-SiO2-TiO2, MnO-SiO2-TiO2 and Al2O3-CaO-FeO-TiO2 was predicted and compared with the experimental values. The results show that the predicted values of M-MIVM (FII) are in good agreement with the experimental data. The average relative error in activity prediction of the six systems is 11%, which is within the experimental error range of 30% proposed by Turkdogan. M-MIVM (FII) is better than MIVM both in parameter fitting and activity prediction, which has better prediction effect on the component activity of multi-element titanium bearing slag system. On this basis, M-MIVM (FII) was used to predict the activities of TiO2 in Al2O3-CaO-SiO2-TiO2 melt, and the influencing factors were analyzed. The results show that the predicted activities of TiO2 are in good agreement with the experimental data, and decrease with the increase of slag basicity and Al2O3 content, which is consistent with the experimental law. A significant advantage of the M-MIVM(FⅡ) lies in its ability to predict thermodynamic properties of multicomponent melt by only using the component activities or infinite activity coefficients in their sub-binary systems.
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