|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Aluminum Reduction Technology
||A Water Model Study of Alumina Feeding and Dispersion
||Kristian Etienne Einarsrud, Sindre Engzelius Gylver, Simen Aase, Simen Bekkevoll, Sigmund A.K. Forberg
|On-Site Speaker (Planned)
||Sindre Engzelius Gylver
In the Hall-Héroult process, alumina is fed periodically into a cryolite bath, typically forming so-called rafts. While rafts have been observed and sampled in industry, the governing mechanisms for raft formation are not easily assessed in this setting.
In this paper, we present a parametric study of alumina feeding and dispersion, where the liquid is kept close to its freezing point, to which cooled (soluble) particles are added. The effect of temperature difference between particles and liquid, particle size distribution (PSD) and gas induced convection is considered and assessed.
Results from the water model experiments show a strong impact of PSD upon the upon the raft floating time. High amounts of fines increased resulting in floating times between 240 and 550 seconds, compared to 35-135 seconds in the case of coarser particles. Increased temperature and convection contributed positively to dispersion, although less significantly than the PSD.
||Planned: Light Metals
||Aluminum, Modeling and Simulation, Other