Selective Adsorption of Sodium Aluminum Fluoride Salts from Molten Aluminum Page: 4 of 33
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List of Tables and Figures
Table 1: Matrix of Test Variables in Experimental Molten Metal Runs
Table 2: Details of Bed Filter Packing
Table 3: Summary of Sodium Pick-up Results from Mg-Bath Reversion Reaction after
the 5 Wt. % Magnesium Alloying Addition
Table 4: Summary of Mercury Porosimetry Results Obtained on Micro-Porous Filter
Media Before and After Filtration
Figure 1: Schematic illustration of interfacial surface energy components for wetting (0
< 90 C) and non-wetting (0 > 900) conditions for molten metal contact on a refractory
Figure 2: Schematic illustration of selective absorption of molten bath from molten
aluminum using a micro-porous filter.
Figure 3. Pore size distribution of sinter bonded alumina (SBA) micro-porous filter
media determine by mercury intrusion porosimetry.
Figure 4: Photograph of SBA micro-porous filter media. Nominal diameter is 4 mm.
Figure 5: Secondary electron image of SBA micro-porous filter media. Note amount of
surface micro-porosity that connects to subsurface micro-porosity.
Figure 6: Schematic illustration of experimental casting station used to evaluate bath
removal by selective absorption.
Figure 7: AlF3 binary phase diagram .
Figure 8: Typical Mg-Na reversion reaction test results obtained in the heated crucible
test to determine the amount of bath remaining after filtration.
Figure 9: Sodium pickup from Mg-bath reversion reaction designed to determine the
effectiveness of the bed filter with various filter media configurations.
Figure 10: SBA micro-porous filter media after removal from bed filter.
Figure 11: Secondary electron image showing the surface micro-topography of used
SBA micro-porous filter media. Compare to Figure 5 for the before filtration condition.
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Aubrey, Leonard S.; Boyle, Christine A.; Williams, Eddie M.; DeYoung, David H.; Smith, Dawid D. & Chi, Feng. Selective Adsorption of Sodium Aluminum Fluoride Salts from Molten Aluminum, report, August 16, 2007; United States. (https://digital.library.unt.edu/ark:/67531/metadc877387/m1/4/: accessed March 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.