Abstract A method for improving the regular solution model by GA-NN is introduced in this article and the activity of component in MnO-SiO2 and CaO-Al2O3 binary system is estimated by this model. Due to the different properties between real solution and regular solution, it is proved that the interaction energy Ωij is the function of temperature and composition, and Ωij ≠Ωji at the same temperature and composition. With the comparison of results received by calculation and previous studies, a high nonlinear capability is found of the model, so it can be used to accurately predict the activity of solution component.
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