Research on Calculating Activities from Binary Phase Diagrams of Ti-Bearing Blast Furnace Slag

Abstract

Based on Kuo-chih Chou formulae of calculating activities from binary phase diagrams, some methods are proposed to improve numerical integration for the formulae. The component activity data of CaO-SiO2, MgO-SiO2 and MnO-TiO2 melts are calculated by the methods under the condition of regular solution’s assumption. The calculation results are in reasonable agreement with experimental data, and the average relative errors between calculated values by using the methods and experimental data are 18%, 18% and 11% respectively. This accuracy is within experimental error range of 10%~30% that Turkdogan proposed. The results show that the new methods are feasible in the practical application. Accordingly, the component activity data of CaO-TiO2, Al2O3-TiO2, SiO2-TiO2 and MgO-TiO2 melts at a given temperature and concentration are calculated by the proposed methods. The relative errors for these systems are comparable to the results of CaO-SiO2, MgO-SiO2 and MnO-TiO2 systems. So the activity data obtained can be used as basic data for thermodynamic study of Ti-bearing blast furnace slag.