Among a wide variety of slag compositions, the SiO 2-CaO-Al 2O 3 ternary system is of particular importance in the field of metallurgy.

Understanding and controlling the physical properties of silicate slags are necessary for improving the removal of molten slags and, thereby, the productivity of industrial operations. In various high-temperature metallurgical processes, silicate slags as a combination of multiple oxides are formed during the operations, for instance, during the reduction of metal oxides in blast and electrical furnaces. This silicate melt is responsible for both mass and heat transfer within the Earth and other terrestrial planets. For instance, in Earth science, magmas are admixtures of molten silicates, crystals, and gases. Silicate melts are of great importance to Earth and material sciences, as well as metallurgical, cement, and glass industries dealing with materials that contain SiO 2. Comparing the model predictions and experiments, a good agreement is found between the model and measured values of viscosity. To model the relationship between structure and viscosity, experimental viscosity data are adopted from the literature. The Arrhenius equation is employed for the temperature dependency of the slag viscosity, where its parameters are linked to the R parameter through curve fitting.

To model viscosity using the Raman spectroscopy data, the ratio of low and high wavenumber vibrational bands is introduced as a structure-related Raman parameter ( R). Using a green source laser with 532 nm wavelength, the Raman spectra are measured within the wavenumbers on the order of 200 to 1300 cm −1. The slag compositions are close to industrial slags in silicon and ferrosilicon production, namely SiO 2 contents of 35 to 75 wt pct, CaO contents of 10 to 40 wt pct, and Al 2O 3 contents of 5 to 40 wt pct. To this end, a group of 20 synthetic slags in the SiO 2-CaO-Al 2O 3 ternary system is considered. The relationship between structure and viscosity of molten slags is investigated using the Raman spectroscopy technique.

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