Abstract
In this study, the effect of BaO/Al2O3 molar ratio on the viscosity and structure of CaOSiO2MgOAl2O3BaO slag was investigated. The results revealed that the viscosity first increased and then decreased with increasing the BaO/Al2O3 ratio, and the transition point occurred at the ratio of 0.36. Deconvolution of Raman spectra showed that the Q3 unit first increased and then decreased with increasing the BaO/Al2O3 ratio, while the Q0, Q1 and Q2 units presented the opposite trend. FTIR and XPS analyses indicated that the [SiO4] and [AlO4] tetrahedra polymerized due to the charge compensation of Al3+ by Ba2+ and the increase in bridging oxygen prior to increasing the BaO/Al2O3 ratio to 0.36. However, once the BaO/Al2O3 ratio further increased, the tetrahedra gradually depolymerized owing to the interrupting effect of BaO and the increase in non-bridging oxygen. Spectral analysis demonstrated that the degree of polymerization of slag was the main factor affecting viscosity.
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