|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Effect of Coke Properties on the Bubble Formation at the Anodes during Aluminium Electrolysis in Laboratory Scale
||Wojciech Gebarowski, Arne Petter Ratvik, Stein Rørvik, Lorentz Petter Lossius, Hogne Linga, Ann Mari Svensson
|On-Site Speaker (Planned)
The anodic reaction of aluminium electrolysis cells leads to the formation of CO2 bubbles, which partly screen the anode surface and leads to an increase in the cell voltage. An advantage of these bubbles is that the formation and release contribute to the stirring of the electrolyte, however, the screening of the surface increase in the irreversible energy losses. More profound knowledge about behaviour of gas bubbles related to anode properties is useful for minimize the screening effect and thus reduce the additional cell voltage. This work focus on the voltage oscillations caused by the formation, growth and release of bubbles at different carbon anode surfaces in lab-scale electrolysis experiments. The oscillations are correlated to properties of the cokes and the anodes, like coke isotropy, anode wettability determined by immersion-emersion tests, and coke fractions. Additionally, computed x-ray tomography imaging is used for investigation of post electrolysis anode surfaces.
||Planned: Light Metals