Effects of CaO/Al2O3, Nb2O5 and SiO2 on the viscosity and structure of molten CaO-Al2O3-5%MgO-SiO2-Nb2O5 system

CZ Wang and WW Ma and JF Xu and XQ Wu and LJ Su, IRONMAKING & STEELMAKING (2025).

DOI: 10.1177/03019233251323659

The viscosity of CaO-Al2O3-5%MgO-SiO2-Nb2O5 molten slags was measured experimentally. The effects of CaO/Al2O3 ratio, Nb2O5 content, and SiO2 content on the viscous behavior of niobium-containing slags were investigated, and the effect of each factor on the microstructure of molten slag was explored by molecular dynamics (MD) simulation. The experimental results show that the viscosity of the molten slag decreases with the increase of CaO/Al2O3 ratio and the SiO2 content, increases with the increase of Nb2O5 content. The results of the MD showed that an increase in CaO/Al2O3 ratio and SiO2 content reduced slag polymerization. Meanwhile, an increase in Nb2O5 content increased slag polymerization. Changes in slag polymerization result in corresponding changes in slag viscosity. The present experimental data were utilized to modify several viscosity prediction models. Among these models, the modified NPL model was found to be more effective in predicting the viscosity of molten niobium-containing slag at high temperatures.

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