Journal of Mining and Metallurgy, Section B: Metallurgy 2012 Volume 48, Issue 3, Pages: 433-442
https://doi.org/10.2298/JMMB120317054Z
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Viscosity model for aluminosilicate melt
Zhang G.H. (School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, China + State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, China)
Chou K.C. (School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, China + State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, China)
The structurally based viscosity model proposed in our previous study is
extended to include more components, e.g. SiO2, Al2O3, FeO, MnO, MgO, CaO,
Na2O and K2O. A simple method is proposed to calculate the numbers of
different types of oxygen ions classified by the different cations they
bonded with, which is used to characterize the influence of composition on
viscosity. When dealing with the aluminosilicate melts containing several
basic oxides, the priority order is established for different cations for
charge compensating Al3+ ions, according to the coulombic force between
cation and oxygen anion. It is indicated that basic oxides have two paradox
influences on viscosity: basic oxide with a higher basicity decreases
viscosity more greatly by forming weaker non-bridging oxygen bond; while it
increases viscosity more greatly by forming stronger bridging oxygen bond in
tetrahedron after charge compensating Al3+ ion. The present model can
extrapolate its application range to the system without SiO2. Furthermore, it
could also give a satisfy interpretation to the abnormal phenomenon that
viscosity increases when adding K2O to CaO-Al2O3-SiO2 melt within a certain
composition range.
Keywords: viscosity, model, aluminosilicate melts, non-bridging oxygen, bridging oxygen