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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Electrode Technology for Aluminum Production
Presentation Title Optical and Electrochemical Characterisation of Carbon Anodes with Varying Porosity and Coke Quality
Author(s) Goril Jahrsengene, Mahyar Farmahini Farahani, Hogne Linga, Ann Mari Svensson
On-Site Speaker (Planned) Goril Jahrsengene
Abstract Scope The performance of carbon anodes in aluminium production is suggested to be affected by both the coke quality (impurities, structure) and the physical properties of the anode (density, permeability, electric resistivity). To investigate the physical properties, different anodes with varying air permeability (0.5-3.5 nPm) were investigated optically and electrochemically. The voltage oscillations due to CO2 bubble formation on the horizontal anode surface appear to depend on the permeability of the anode, with lower permeability resulting in the highest oscillations. Laboratory-fabricated anodes with different sulfur content (1.42-5.54 wt%) and coke structure were characterized electrochemically. There were only small differences in the overpotential between all anodes investigated, however, a significantly higher double layer capacitance, a measure of the electrode-electrolyte interfacial contact area, was observed for anodes made of isotropic coke compared to the standard anisotropic coke.
Proceedings Inclusion? Planned: Light Metals
Keywords Aluminum,


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