|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Cathode Wear in Electrowinning of Aluminum Investigated by a Laboratory Test Cell
||Zhaohui Wang, Saeid Nobakhtghalati, Asbjørn Solheim, Kati Tschöpe, Arne Petter Ratvik, Tor Grande, Anne Støre
|On-Site Speaker (Planned)
The lifetime of an aluminium electrolysis cell is mainly determined by the cathode wear, especially for high amperage cells utilizing graphitized carbon cathodes. The underlying mechanisms for cathode wear are, however, complex and still subject to debate. Laboratory tests using inverted cell configurations have been used to study commercial cathode materials. Here we report on results obtained in the last 5 years for three different commercial cathode materials. The current density applied in the tests was in the range from 0 to 1.5 A/cm2 and the rotation speed of the cathode was from 0 to 125 rpm. The wear mechanisms with respect to current density, limiting current of Al4C3 formation and mass transport are discussed. In addition, the difference in the wear pattern of the three carbon materials is illustrated by X-ray computed tomography. Similarities and differences between wear observed in the laboratory and in industry cells are discussed.
||Planned: Light Metals Volume