The viscosities for the selected CaO-MgO-SiO2 and CaO-MgO-Al2 O3-SiO2 slags were measured by rota-ting cylinder method in a wide temperature range from 1 608 K to 1 823 K.The effects of temperature,slag basicity and Al2 O3 content were studied.The results indicated that the viscosity decreased with increasing the slag basicity at the same temperature.And the viscosities of the slag initially increased linearly with increasing Al2 O3 content in the slags and then decreased as the Al2 O3 content in the slags continued to increase.Al2 O3 addition has a more signifi-cant effect on the viscosity than slag basicity in the selected slags.Based on the experimental data and the fraction of solid phases calculated by the thermodynamic software,the effect of solid phases on slag viscosity was evaluated. The results indicated that the relationship between the relative viscosity and the volume fraction of solid phases esti-mated from the slag composition can be reasonable by allowing the inverse maximum fraction of solid particles to vary.
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