To reveal the viscosity evolution of vanadium slag while using photovoltaic cutting waste as a reductant during the pre-reduction process, the viscosity of the FeO−SiO2−V2O3−CaO−MnO−Cr2O3−TiO2 slag system was experimentally measured and a modified half−empirical Iida model was established. The results showed that the viscosity increased from 0.12 Pa s to 0.47 Pa s at 1873 K with the mass fraction of FeO decreasing from 37% to 11%, and the percentage difference of the calculated using optimized Iida model and measured viscosity values (δn) was below 11.4%. Furthermore, the viscosity model also well predicted the subsidiary systems of FeO−SiO2−V2O3−Cr2O3−TiO2 and FeO−SiO2−V2O3−MnO−TiO2, with δn below 13.6% and 11.2%, respectively. For the vanadium slag with Cr2O3 mass% less than 5 and basicity (R=m(CaO)/m(SiO2)) less than 0.5, the optimized Iida model could provide theoretical viscosity and it had a satisfactory agreement with experimentally measured results.
KEY WORDS: vanadium slag; reduction; viscosity; Iida model.