Journal of Siberian Federal University. Engineering & Technologies / Investigation of Bubble Behaviour at Cryolite Melt – Alumina Slurry Electrolysis

Full text (.pdf)
Issue
Journal of Siberian Federal University. Engineering & Technologies. 2016 9 (6)
Authors
Yasinskiy, Andrey S.; Polyakov, Peter V.
Contact information
Yasinskiy, Andrey S.:Siberian Federal University 79 Svobodny, Krasnoyarsk, 660041, Russia; E-mail: ; Polyakov, Peter V.:Siberian Federal University 79 Svobodny, Krasnoyarsk, 660041, Russia
Keywords
dimension analysis method; similarity criteria; high temperature slurry electrolysis; fluid physics in non-Newtonian fluids; inert anodes; low temperature electrolysis; aluminium production
Abstract

Physical modeling of oxygen bubbles generated on the inert anode as a result of electrochemical evolution at cryolite melt – alumina slurry electrolysis movement, growth and evacuation results are presented in the paper. Similarity criteria are calculated, experiments are performed on two types of cell: for three phase flow at vertical electrode observation from front and side views. The behaviour of bubbles in slurry was recorded. For the model, an 20 % aqueous solution of sulfuric acid with 30 vol. % of alumina was used. Current density range was 0.05 to 0.25 A/cm2. Bubble behavior information allows estimating the ability of effective gas evacuation from the inter-electrode space during slurry electrolysis. The highest bubbles vertical speed (2.5 cm/s) was reached at 15 to 20 cm depth from the electrolyte – atmosphere border, after which the speed was reduced. Bubble layer thickness does not exceed 2.2 mm. Bubble’s average growth rate was 2.68 mm3/s

Pages
854-871
Paper at repository of SibFU
https://elib.sfu-kras.ru/handle/2311/21033

Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).