Viscosity modeling and glass formation studies in oxy-fluoride melts
AuthorHebbar, Kavitha N.
AdvisorReddy, Ramana G.
Mining and Metallurgical Engineering
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A structure based model that was developed was used to predict viscosities of MO-SiO2 (where MO is Cao, MgO, MnO, Bao, SrO and FeO) and M2O-SiO2 (where MiO is Nap, K2O and Li2O) and ternary MO-NO-SiO2 (where MO and NO are Cao, FeO, MgO and MnO) type of melts in the composition range of 0.1 < XSi~ < 1. Both composition and temperature effects are considered in coming up with the viscosity expression. In comparison to several existing empirical models, the present model seems to predict the viscosities more consistently over extended ranges of temperatures and composition. The effect of sol ids on viscosity has also been considered. The ternary model needs some modifications in order to predict the experimental isoviscosity contours. The initial studies on the safe disposal of spent potliner (SPL) obtained from an aluminum electrolytic cell by fixing it in a glassy matrix have been done. The glassy nature of the melts of the as received SPL, the fused and the fused SPL with additions of varying percentages of silica and calcium oxide were determined using X-ray diffraction and SEM analysis. A comparison of the analysis on SPL melts with those containing various amounts of silica and calcium oxide indicates that more than 20 wt pct. silica is required to make a completely glassy matrix.
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