Effect of Al₂O₃ on viscosity and structure of CaO–SiO₂–FeO_t–(Al₂O₃)–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–SiO₂–FeO_t–(Al₂O₃)–BaO slag with different Al₂O₃ content was measured. The effect of Al₂O₃ on structure evolution was investigated. The results showed that the viscosity of steel slag increased by the addition of Al₂O₃. The FTIR and Raman analysis all showed that the structures of [SiO₄] symmetric tetrahedron and [AlO₄] asymmetric tetrahedron were more complex by the addition of Al₂O₃. The XPS analysis the showed that the overall relative fraction of O0 increased from 34.72% to 38.05%, O^- decreased from 55.55% to 54.07%, and O^2- decreased from 9.73% to 7.88% with the Al₂O₃ content from 0% to 6wt%. The above analysis meant the degree of polymerization (DOP) increased by the addition of Al₂O₃, which are agree well with the results of viscosity measurement.

KEYWORDS:

• Viscosity
• structure evolution
• degree of polymerisation
• molten slag
• BaO
• Al₂O₃
• deconvoluted
• transformation

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This research was founded by an independent research project from State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing.