Modelling effects of additives on viscosity of molten blast furnace slag

Abstract

A simple model was established to calculate and predict the effects of network modifiers on the viscosity of molten blast furnace slag by relating the effects to the ionic bond force parameter. It was found that the model performs very well in calculating the viscosity of blast furnace slags containing FeO, MnO, BaO, Na₂O, K₂O and CaF₂, with relative error Δ of 0·219 (±0·196) and overall absolute error (root mean square error) of 0·402 Pa s. The viscosity decreasing abilities are in the order of K₂O<(Na₂O, BaO)<(CaO, MnO, FeO)<MgO<CaF₂. The effects of other network modifiers on the viscosity can also be predicted. As alkali metal oxides have much lower bond strength and smaller molar weight, their viscosity decreasing abilities evolve differently from divalent metal network modifiers, whereas the viscosity decreasing abilities of alkali and divalent metal network modifiers increase linearly with increasing I/M, where I is ionic bond strength parameter, and M is molar weight.

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