Activity Calculation Model for Ternary Slag System of Al2O3-BaO-B2O3 Original Research Article

According to the ion and molecule coexistence theory, the activity model of Al2O3-BaO-B2O3 ternary slag system was established, and the influences of BaO/Al2O3 molar ratio, B2O3 mole fraction and temperature on the activity of the slag system were investigated. Finally, the equal activity curves were drawn with the model results. The results show that with the increase of BaO/Al2O3 ratio, the activity of Al2O3 is significantly reduced, the activity of BaO • Al2O3 is increased obviously, and the activity of 2Al2O3 • B2O3 is also decreased. With the increase of B2O3 mole fraction, the activity of BaO • Al2O3 decreased significantly, while the activities of BaO • 2B2O3 and 2Al2O3 • B2O3 increased. In addition, the influence of temperature on the activities of different components is comparatively smaller than the influence of BaO/Al2O3 ratio and B2O3 mole fraction.