抄録
A statistical thermodynamic model, cell model, has been attempted to represent the hydroxyl capacities of some moltensilicates and molten aluminates. The slag systems discussed were CaO-SiO2, CaO-Al2O3 binaries and CaO-SiO2-MgO, CaO-Al2O3-MgO and CaO-SiO2-Al2O3 ternaries. The cell model is based on the description of the liquid in terms of cells composed of an oxygen anion surrounded by two cations (i, j). In addition to binary parameters, Wij and Eij a new parameter, W'Hi was introduced into the cell model for representing the hydroxyl capacity. Here, W'Hi is free energy of formation of dilute H-O-i cell. The hydroxyl capacities calculated by the model agreed with the experimental data over the wide range of slag composition and temperature. A good correlation between WHiand free energy of formation of hydroxide was confirmed. Therefore, the cell model with the new parameter W'Hiis considered to be applicable to predict the hydroxyl capacities of multicomponent slags.
