|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Impact of Cast Iron Degradation and Cathode Block Erosion on the Current Path in the Cathodic Assembly of Aluminum Production Cells
||Martin Brassard, Marc LeBreux, Martin Desilets, Gervais Soucy, Martin Forté, Jean-François Bilodeau
|On-Site Speaker (Planned)
Carbon-cast iron electrical contact degradation is still considered one of the main cause for the CVD increase over the lifetime of the electrolysis cell. An Ansys numerical model was developed to evaluate the effect of the carbon-cast iron electrical contact degradation and the cathode erosion on the CVD and the current path. Chemical degradation data from laboratory and industrial samples were used to calibrate the cast iron and the contact resistivities. Results demonstrate that the contact degradation at the cast iron interface has a direct impact on the current distribution at the carbon block surface. Current density that is concentrated at the ledge toe is pushed back toward the center of the block as the electrical contact quality decreases. When coupled with the carbon block erosion, the resulting current distribution may give a clue about the double W shape erosion.
||Planned: Light Metals