| Autor: |
Cui, Ya-tao, Wang, Xue-you, Zhang, Xu-bin, Wang, Qiang-qiang, He, Sheng-ping |
| Zdroj: |
Journal of Iron and Steel Research International; 20240101, Issue: Preprints p1-11, 11p |
| Abstrakt: |
The effect of TiO2absorption into two different CaO–BaO–SiO2–Al2O3-based mold slags from the steel plant on the viscosity, melting performance and microstructure of slags was investigated through the measurement of the viscosity–temperature relationship, melting temperature and Raman spectroscopy. The parameter of the number of non-bridging oxygen per tetrahedrally-coordinated atom (NBO/T) was also calculated to explain the microstructure variation of molten slags with different TiO2absorption. The variation of the actual slag consumption and the depth of the liquid slag in mold was explained through the comparison of the viscosity and the melting temperature of two different slags. The viscosity of mold slags (basicity = 0.6) decreased from 1.1 to 0.68 Pa s with the increase in the TiO2absorption from 0 to 10%, while that of slags (basicity = 0.7) decreased from 0.76 to 0.56 Pa s with the TiO2absorption from 0 to 6%. The activation energy of both two groups of slags had the tendency to decrease with the increasing TiO2absorption. The network structure of both two groups of slags measured by the Raman spectra showed that the fraction of complex structure units (Q1, Q2, Q3and Al–O–Al) decreased and simple structure units (Al–O−and Q0) increased with the increase in TiO2absorption. NBO/T also increased with the increase in the TiO2absorption, indicating that the absorption of TiO2into slags resulted in the destruction of silicate/aluminate structure. Hence, the absorption of TiO2into the current CaO–BaO–SiO2–Al2O3mold slags decreased the degree of polymerization of these slags and then led to the decrease of viscosity. |
| Databáze: |
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