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“A method for the control of alumina concentration in aluminum reduction cells”

Authors: Jens G. Balchen,
Affiliation: NTNU, Department of Engineering Cybernetics
Reference: 1992, Vol 13, No 1, pp. 41-49.

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Keywords: Experimenting control, aluminium reduction cell, alumina concentration

Abstract: The paper presents a new method for the control of the concentration of the alumina in electrolysis cells for the production of aluminium. The method is based upon the well known fact that apparent resistivity of the cell is a function of the alumina concentration so that the resistivity has the lowest value around the concentration of three per cent and increases in both directions. The method uses the cross correlation between a perturbation of the feed flow of alumina into the cell and the resulting response in measured voltage across the cell. The cross-correlation is proportional to the slope of the resistivity against concentration curve, making it possible to control the alumina flow, to achieve a desired slope. The method has much in common with other methods presently in use which require a much more complicated computation scheme.

PDF PDF (1122 Kb)        DOI: 10.4173/mic.1992.1.4

DOI forward links to this article:
  [1] Hongliang Zhang, Tianshuang Li, Jie Li, Shuai Yang and Zhong Zou (2016), doi:10.1007/s11837-016-2150-4

[1] BALCHEN, J.G., HØSØIEN, O. (1971). Investigation of different strategies for computer control of aluminium reduction cells, 3rd IFAC/IFIP Conference of Digital Computer Applications to Progress Control. Helsinki. Instrument Society of America, 1971, Part 1, paper III-5, pp, 1-8.
[2] BORG, P., MOEN, T. AALBU, J. (1986). Adaptive control of alumina reduction cells with point feeders, Modeling, Identification and Control, 7, 45-56 doi:10.4173/mic.1986.1.3
[3] DRAPER, C.S. LI, Y.T. (1951). Principles of optimalizing control and an application to internal combustion engine, American Society of Mechanical Engineering Publication.
[4] FJELLSTAD, O.-E. HAGEN, J. (1989). Experimenting control of alumina concentration in aluminum electrolysis cells, in Norwegian. Project Report. Div. of Eng. Cybernetics, The Norwegian Institute of Technology, Trondheim, Norway.
[5] GRAN, E. (1980). Multi variable control of aluminium reduction cells, Modeling, Identification and Control, 1, 247-258 doi:10.4173/mic.1980.4.4
[6] LARSEN, A.S. (1971). The integrated on-line commercial computer installation at the Aluminium reduction plant in Sunndal, Norway, The 3rd IFAC/IFIP Conference on Digital Computer Applications to Process Control, Helsinki. Instrument Society of America, 1971, Part I, paper III-6, pp. 1-7.
[7] McMAHON. T.K. DIRTH, G.P. (1966). Computer control of aluminum reduction cells, Journal of Metals, 18, 317-319.

  title={{A method for the control of alumina concentration in aluminum reduction cells}},
  author={Balchen, Jens G.},
  journal={Modeling, Identification and Control},
  publisher={Norwegian Society of Automatic Control}


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