Experimental measurements and modelling of viscosity in CaO–Al2O3–MgO slag system

The viscosity of the CaO–Al2O3–MgO slag system has been measured by the rotating cylinder method up to 1823 K. The MgO content was between 0·39 and 11·33 wt-%, and the mass ratio of CaO/Al2O3 was between 0·60 and 1·28. The results indicated that both the MgO content and the mass ratio of CaO/Al2O3 have an influence on the viscosity of the slag. The effect of the mass ratio of CaO/Al2O3 is larger than that of the MgO content. The viscosity decreased with increasing MgO content and then increased. The effect of the mass ratio of CaO/Al2O3 on the viscosity was similar. The main mineralogical compositions of the slag were determined by X-ray diffraction, and their effects on viscosity were investigated. The measured results were in good agreement with those given by the Iida model.