Abstract
Effect of phosphorus on current efficiency for aluminum deposition was measured in a laboratory cell with current densities of 0.8 and 1.5 A/cm2. Controlled amounts of AlPO4 were added to the bath at the beginning of the experiment, and the effect on the current efficiency was studied at current densities of 0.8 A/cm2 and 1.5 A/cm2. Phosphorus levels were monitored through sampling the bath using High Resolution Inductively Coupled Plasma Mass Spectrometry at regular intervals during the whole electrolysis. The deleterious effect of phosphorus on the current efficiency was found to be pronounced at low concentrations up to 220 ppm. The current efficiency was found to increase with increasing cathodic current density and have a maximum current efficiency of 95.5% at 1.5 A/cm2 for this particular cell design. A further increase of current density up to 2 A/cm2 resulted in a decrease of current efficiency.
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References
J. Thonstad, P. Fellner, G.M. Haarberg, J. HÃveÅ¡, H. Kvande, and Ã…. Sterten Aluminum electrolysis – Fundamentals of the Hall-Héroult process, 3rd edition (Aluminum-Verlag GmbH, Düsseldorf, Germany, 2001), 227
K. Grjotheim and H. Kvande, Introduction to Aluminum Electrolysis, (Aluminum-Verlag GmbH, Düsseldorf, Germany, 1993), 147
K. Grjotheim , C. Krohn, M. Malinovsky, K. Matiasovsky, and J. Thonstad, Aluminum electrolysis – Fundamentals of the Hall-Héroult process, 3rd edition (Aluminum-Verlag GmbH, Düsseldorf, Germany, 1992)
Ã…. Sterten, P.A. Solli, and E. Skybakmoen, Influence of electrolyte impurities on current efficiency in Aluminum electrolysis cells, J. Appl. Electrochem., 28, 781 (1998)
P.A. Solli, Current efficiency in Aluminum electrolysis cells, (Ph.D. thesis, Norwegian University of Science and Technology, 1993), 116–128.
E.W. Thisted, Electrochemical properties of Phosphorus Compounds in Fluoride Melts cells, (Ph.D. thesis, Norwegian University of Science and Technology, 2003), 200–202
P.A. Solli, E. Skybakmoen, and Å. Sterten, Current Efficiency in the Hall-Héroult process for Aluminum electrolysis: experimental and modeling studies, J. Appl. Electrochem., 27, 939–946 (1997)
R. Meirbekova, G. Saevarsdottir, J.P. Armoo and G.M. Haarberg, Effects of current density and phosphorus impurities on the current efficiency for Aluminum deposition in cryolite-alumina melts in a laboratory cell, In proceedings, Molten Salts 9, Trondheim June 2011.
R. Meirbekova, G. Saevarsdottir, J.P. Armoo and G.M. Haarberg, Effects of current density and phosphorus impurities on the current efficiency for Aluminum deposition in cryolite-alumina melts in a laboratory cell, Light Metals 2013,The Metals Materials and Mineral Society
P.A. Solli, E. Skybakmoen, and Å. Sterten, Design and performance of a laboratory cell for determination of current efficiency in the electrowinning of Aluminum, J. Appl. Electrochem., 26, 1019–1025 (1996)
P.V. Polyakov, V.Y. Buzunov, Y.G. Mikhaev and V.G. Printsev, Movement of Metal-Electrolyte Interface in Aluminum Reduction cells by Marangani Effect, Tsvetnye Metally, Vol.34, No 3, 29–31, 1993.
W.Haupin and W. McGreew, Aluminium 51, 273, 1975
S. Rolseth. and J. Thonstad, On the mechanism of the Reoxidation Reaction in Aluminum Electrolysis, Light Metals 1981, The Metals Materials and Mineral Society, 289–301
M.Keppert, Electrochemical behaviour of the phosphorus species in fluoride melts, (Ph.D. thesis, Norwegian University of Science and Technology, 2006), 20
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Meirbekova, R., Thonstad, J., Haarberg, G.M., Saevarsdottir, G. (2014). Effect of Current Density and Phosphorus Species on Current Efficiency in Aluminum Electrolysis at High Current Densities. In: Grandfield, J. (eds) Light Metals 2014. Springer, Cham. https://doi.org/10.1007/978-3-319-48144-9_128
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DOI: https://doi.org/10.1007/978-3-319-48144-9_128
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