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Erschienen in:
2016 | OriginalPaper | Buchkapitel
Effect of Current Density and Phosphorus Species on Current Efficiency in Aluminum Electrolysis at High Current Densities
verfasst von : Rauan Meirbekova, Jomar Thonstad, Geir Martin Haarberg, Gudrun Saevarsdottir
Erschienen in: Light Metals 2014
Verlag: Springer International Publishing
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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.