| Silver solubility technique was employed to deduce the relationship between quantitative basicity index and physicochemical properties of molten slags such as viscosity and refining abilities. Also, the theoretical assessment for the slag design concept on the basis of slag basicity was discussed. The relative basicity of basic oxides and CaF₂ with respect to CaO and that of acidic oxides with respect to B₂O₃ was estimated from the solubility difference of silver in MO-B₂O₃ (MO=CaO, BaO, Na₂O), CaO-RO (RO=B₂O₃, SiO₂, Al₂O₃), and CaO-Al₂O₃-CaF₂ slags. By using the relative basicity values of each component, a new basicity index for the complex slags was proposed. The viscosity and the refining ability of molten slags could be predicted as a function of basicity index within the experimental uncertainty. In addition, the estimation for the optimized composition of slags according to the goal of refining process and the basic concept for the slag design was discussed. |
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