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Viscosity Estimation of Multicomponent Slags of the CaO–SiO2–Al2O3–FexO System Based on Microstructure Analysis

Slag viscosity is
key factor of liquid steel refining and the smooth
slag tapping of entrained flow coal gasifiers, and the accurate estimation
of slag viscosity can provide a guidance for the selection of industrial
raw material and the control of industrial process. In this study,
a structure-related viscosity model about the multicomponent slags
of the CaO–SiO2–Al2O3–FexO system is developed based
on the flow mechanism of silicate melt to improve slag viscosity behavior.
The present estimation model improved the expression of activation
energy equation on the basis of the model proposed by Nakamoto and
expanded the application from the ternary CaO–SiO2–Al2O3 system to the quaternary CaO–SiO2–Al2O3–FexO system. Then, the structural roles of all the components
were clarified, and the types of oxygen bonds were defined by Raman
spectroscopy. The fractions of various oxygen bonds were obtained,
and the database of oxygen bonds in any composition within the range
of experimental slags was generated by utilizing the Lagrange interpolation
method. The result showed that the present model had an advantage
in estimating slag viscosity within the compositional range of this
experiment slag, and the mean deviations between the viscosities calculated
by the present model and measured or published viscosities were within
20%. The model will offer a reference for the estimation and adjustment
of slag behavior in the metallurgical slag or coal slag, especially
for the iron-rich system.