Abstract
One factor influencing the current efficiency in an aluminium electrolysis cell is the concentration of dissolved alumina in the electrolyte. Unfortunately, no direct measurement of alumina concentration is usually available and present control strategies for alumina feed control rely heavily on the change in cell pseudo-resistance. This paper describes work done to investigate the possibility of using additional measurements of anode current distribution in an extended Kalman filter for the purpose of detecting malfunctioning alumina feeders.
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