An expression for the accurate prediction of the viscosities of various indvstrial slags has been derived using a model based on the concept of network structure. The equation is expressed in terms of slag componentsand some basic physical quantities. The viscosity predictions closely fit with the experimental data for a large number of blast furnace type slags.

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The viscosity of the melts formed in the sintering reaction was measured for evaluating the fluidity of the melts, which play a crucial role in the sintering process. Using the sphere draw-up method carried out the measurements of high temperature viscosity. With low-melting point compositions of the Fe 2 O 3 -CaO-SiO 2 system, the viscosity of high SiO 2 content melts (Fe 2 O 3 /CaO/SiO 2 ϭ38.5/34.5/27.0 weight basis) was 5 times higher than that of low SiO 2 content melts (Fe 2 O 3 /CaOϭ80/20). The viscosity of low SiO 2 content increased with addition of Al 2 O 3 and SiO 2 . Similarly, with melt compositions generated from actual ores, viscosity depended on the contents of Al 2 O 3 and SiO 2 .Based on the results, the viscosity of the melted liquid was estimated from the chemical composition, and the viscosity of the solid-liquid coexistence phase was also evaluated using a viscosity calculating equation for suspensions. The viscosity distribution of the solid-liquid coexistence phase at 1 300°C in the ternary composition system Fe 2 O 3 -CaO-SiO 2 was obtained.

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