|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Aluminum Reduction Technology
||Wetting of Carbon Cathodes by Molten Cryolite and Aluminium
||Samuel Senanu, Tor Grande, Arne Petter Ratvik, Asbjorn Solheim
|On-Site Speaker (Planned)
The extent to which the carbon cathode is wetted by molten cryolite and aluminium has been an important topic in aluminium electrolysis due to its importance to pot operation and design, as well as understanding cathode wear. The present paper reports on a laboratory study of the wettability of the three main carbon cathode types (anthracitic, graphitic and graphitized) used in the aluminium industry. An apparatus for the measurement of the wetting angles based on the immersion-emersion technique was employed. The wetting was studied with or without polarization of the carbon cathode. The measurements demonstrated that the carbon cathode is better wetted by the molten cryolite bath than liquid aluminium. Liquid aluminium showed limited to no wetting without cathodic polarization whiles the molten cryolite showed some wetting even without polarization. Polarization of the cathode samples improved the wetting by both molten cryolite and liquid aluminium.
||Planned: Light Metals