Abstract
Samples of top crust were prepared in the laboratory, using various bath compositions and temperatures and with variable mixing ratios of alumina/crushed anode cover. The temperature gradient and the heat flux through the crust and the loose alumina mixture were studied, and it was found that the heat flux increased strongly with increasing contents of crushed anode cover in the mixture, due to increased thermal conductivity of the material. Across the air-filled gap between the bath surface and the crust the heat is mainly carried by infra-red radiation, and the investigations showed that the emissivity of the downward-facing crust surface increased slightly with increasing contents of crushed anode cover in the mixture.
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Reference
A.A. Volberg, E.L. Sukhanov, A.I. Belyaev. “Structure and thermophysical properties of surface crust formed on industrial aluminium cells.” Izv. Nauk. SSSR. Met. Gorn. Delo. No.5 (1964) pp. 45–56. (Russian text)
X. Liu, M.P. Taylor, S.F. George. “Crust formation and deterioration in industrial cells.” TMS Light Metals 1992, pp. 489–494.
T.J. Johnston and N.E. Richards, “Correlation between alumina properties and crusts”, TMS Light Metals 1983, pp. 623–639
T. Eggen, S. Rolseth, K. Rye, J. Thonstad. “Alumina crusting in cryolitic melts. Part I: Penetration of molten electrolyte into alumina.” TMS Light Metals 1992. pp. 495–502.
K.A. Rye. “Alumina crusting in cryolitic melts. Part II: Bulk properties of crust.” TMS Light Metals 1992 pp. 503–509.
K.A. Rye. “Crust formation in cryolite-based baths.” Dr.Ing. Thesis #22 1992. University of Trondheim, NTH.
K.A. Rye. “In-situ measurements of the thermal conductivity of laboratory made Hall-Heroult crusts.” Proc. 7’th Al. Symp. Banska Bystrica, Slovakia 1993. pp. 293–300.
A.J. Becker, T.R. Hornack and R.M. Mazgaj, “Hardness of crust and properties of crust”. Unpublished results presented at the 114’th AIME Annual Meeting, New York, February 24–28, 1985, and Internal Reports, Alcoa Laboratories.
A.J. Becker, T.R. Hornack, T.J. Steinbeck, “In-situ properties of crusts formed with five ores in a Soderberg smelting cell,” TMS Light Metals 1987, pp. 41–50.
Battelle Inert Electrodes Program ; “Final report on the PNL program to develop an alumina sensor.” US. Dept. Energy Contract DE-AC06–76RLO 1830 (1992) p. 4.1
“Bestimmung von Einstrahlzahlen.” VDI-Wärmeatlas. VDI-Verlag GmbH, Düsseldorf, Germany, 3.ed (1977) p. Kb 5.
E. Skybakmoen, A. Solheim, and A. Sterten, “Phase Diagram for the System Na3AlF6-Li3AlF6-AlF3-Al2O3. Part II: Alumina Solubility,” Light Metals 1990, pp. 317–323.
S.S. Lee et al. “Determination of melting temperatures and Al2O3-solubilities for Hall cell electrolyte compositions.” TMS Light Metals 1984, pp. 841–855.
N.E. Richards. “Alumina in smelting.” Proc. 13th Int. Course on Process Met. of Aluminium. Trondheim, Norway 1994, p. 3.40.
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Rye, K.Å., Thonstad, J., Liu, X. (2016). Heat Transfer, Thermal Conductivity, and Emissivity of Hall-Heroult Top Crust. In: Bearne, G., Dupuis, M., Tarcy, G. (eds) Essential Readings in Light Metals. Springer, Cham. https://doi.org/10.1007/978-3-319-48156-2_93
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DOI: https://doi.org/10.1007/978-3-319-48156-2_93
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