Effect of Al ₂ O ₃ on viscosity and structure of CaO–SiO ₂ –FeO _t –(Al ₂ O ₃ )–BaO slag

Abstract

The viscosity of steel slag plays an important role in mass transfer, steel-slag reaction rate and slag discharge. The viscosity of CaO-SiO 2 -FeO t -(Al 2 O 3 )-BaO slag with different Al 2 O 3 content was measured. The effect of Al 2 O 3 on structure evolution was investigated. The results showed that the viscosity of steel slag increased by the addition of Al 2 O 3 . The FTIR and Raman analysis all showed that the structures of [SiO 4 ] symmetric tetrahedron and [AlO 4 ] asymmetric tetrahedron were more complex by the addition of Al 2 O 3 . The XPS analysis the showed that the overall relative fraction of O0 increased from 34.72% to 38.05%, Odecreased from 55.55% to 54.07%, and O 2decreased from 9.73% to 7.88% with the Al 2 O 3 content from 0% to 6wt%. The above analysis meant the degree of polymerization (DOP) increased by the addition of Al 2 O 3 , which are agree well with the results of viscosity measurement.