A thermochemical model description of CaO-SiO2-Al2O3 silicate system

A thermochemical model based on the ion and molecule coexistence theory (IMCT) was developed to calculate thermodynamic data in the CaO-SiO2-Al2O3 slag system, considering the influential role of oxide activities on the thermodynamic properties of slags. Using this model, iso-activity contours were obtained for oxide components CaO, SiO2 and Al2O3 in this system at temperatures of 1,873 K and 1,773 K. When compared with the IMCT model, it is found that the predicted activities of oxide components in the CaO-SiO2-Al2O3 system using the model developed in this study better matches experimental data from literature in terms of both trend and numerical value. Therefore, the model developed in this study can serve as a robust modeling tool for metallurgical processes, and the thermodynamic data predicted by this new model can be used to improve the metallurgical technology.