LAUSR

The effects of TiO2 and FeO on the viscosities of CaO–MgO–Al2O3–SiO2–TiO2-FeO slag are investigated by the rotating cylinder method. The structural characterization of the quenched samples are also studied by Fourier transform infra-red and Raman spectroscopy. Experimental results show that viscosity decreases with increasing TiO2 or FeO, while keeping the basicity and contents of other components constant. Both, Fourier transform infra-red and Raman spectroscopy results show that there are no significant change of the asymmetric stretching vibration bands for [AlO4] tetrahedra among the slags and there is no Q3 in the slags. It is concluded that both TiO2 and FeO in the slags behave as basic oxides, which break the silicate network in the slag and reduce the slag viscosity. The Raman spectroscopy results show that the Q2 in slag increases with increasing FeO and decreasing TiO2. The polymerization degree of silicates decreases with decreasing Ti–O–Si or Ti–O–Ti stretch vibration and increasing O–Ti–O or O–(Si, Ti)–O stretch vibration, which make the slag viscosity decrease.