Abstract
The dissolution rate of alumina (v) is evaluated in cryolite alumina melts with a cryolite ratio (CR) lower than 2.1 to determine the possibility of further increasing the AlF3 concentration in industrial electrolytes in order to increase the current efficiency of modern electrolyzers. The value of v was determined by the electrochemical method based on the measurement of equilibrium electromotive force of a concentration galvanic cell after loading the portion of alumina into the melt. It is established that the decrease in CR < 2.1 leads to the essential reduction of solubility of alumina and its dissolution rate. According to the dependence of v on the alumina content in the melt, it is shown that the processes of mass and heat transfers are the limiting stages.
Similar content being viewed by others
References
Isaeva, L.A. and Polyakov, P.V., Glinozem v proizvodstve alyuminiya elektrolizom, Krasnotur’insk: OAO BAZ, 2000.
Grjotheim, K., Krohn, C., Malinovský, M., et al., Aluminium electrolysis. Fundamentals of Hall-Heroult Process, Düsseldorf: Aluminium-Verlag, 1982.
Thonstad, J., Fellner, P., Haarberg, G.M., et al., Aluminium electrolysis. Fundamentals of Hall-Heroult Process, Düsseldorf: Aluminium-Verlag, 2001.
Beck, T.R., Light Metals, 1994, p. 417.
Yang, J., Hryn, J.N., and Davis, B.R., Light Metals, 2004, p. 321.
Richards, N.E., Rolseth, S., and Thonstad, J., Light Metals, 1995, p. 391.
Berg, L.G., Vvedenie v termographiyu (Introductory Thermal Analysis), Moscow: Nauka, 1969.
Solheim, A., Rolseth, S., Skybakmoen, E., et al., Metal. Mater. Trans. B, 1996, vol. 27, p. 739.
Solheim, A., Rolseth, S., Skybakmoen, E., and Sterten, A., Light Metals, 1995, p. 451.
Skybakmoen, E., Solheim, A., and Sterten, A., Light Metals, 1990, p. 317.
Rolseth, S., Hovland, R., and Kobbeltveldt, O., Light Metals, 1994, p. 351.
Vetyukov, M.M., Tsyplakov, A.M., and Shkol’nikov, S.N., Elektrometallurgiya alyuminiya i magniya (Electrometallurgy of Aluminum and Magnesium), Moscow: Metallurgiya, 1987.
Asbjornsen, O.A. and Andersen, J.A., Light Metals, 1977, p. 137.
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © N.V. Vasyunina, I.P. Vasyunina, Yu.G. Mikhalev, A.M. Vinogradov, 2009, published in Izvestiya VUZ. Tsvetnaya Metallurgiya, 2009, No. 4, pp. 24–28.
About this article
Cite this article
Vasyunina, N.V., Vasyunina, I.P., Mikhalev, Y.G. et al. The solubility and dissolution rate of alumina in acidic cryolite aluminous melts. Russ. J. Non-ferrous Metals 50, 338–342 (2009). https://doi.org/10.3103/S1067821209040051
Published:
Issue Date:
DOI: https://doi.org/10.3103/S1067821209040051