Home List of Titles Analysis of the current distribution in an aluminium electrolysis cell with copper collector-bar cathode assembly
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/220558
- Analysis of the current distribution in an aluminium electrolysis cell with copper collector-bar cathode assembly
- Das, Subrat; Morsi, Yos; Brooks, Geoffrey
- Understanding the magneto-hydrodynamic forces generated due to the external magnetic field and current density distribution within the cell (current in cell linings) is important in the optimization of cell dynamics. It is well documented that these factors play a crucial role in establishing the metal-pad stability of the cell. Conventional cells use the cathode-collector- bar assembly to carry the current through molten aluminium, the cathode and the steel collector-bar to nearest external bus. The electrical conductivity of the steel is so poor relative to the molten aluminium that the outer third of the collector bar carries the maximum load, which in turn increases the horizontal components of the current within the cell. Previous studies have modelled improvement in the cell instability through external magnetic compensation by redistributing current in the cathode busbar. Very little to date has been published on work to improve the current distribution within the cell. In this work, the current distribution in an aluminium electrolysis cell with copper collector-bar was predicted using finite element modelling. A 2D cross-section of a commercial cell was used under steady conditions of electrical fields in anode, electrolyte, molten aluminium and copper cathode- assembly. Different shapes and sizes of the cathode assembly are also considered to optimise the distribution of current throughout the cathode lining. The findings indicated that the copper-bar of similar size to steel could save voltage up to 150 mV. There is a reduction of more than 70% in peak current density value due to the copper inserts. The predicted trends of current distribution show a good agreement with previously published data.
- Publication type
- Conference paper
- Research centre
- Swinburne University of Technology. Faculty of Engineering and Industrial Sciences
- Paper presented at the 10th Australasian Aluminium Smelting Technology Conference, Launceston, Tasmania, Australia, 09-14 October 2011
- Publication year
- Aluminium teduction cell; Cathode voltage drop; Copper collector bar; Current density; Current distribution; Numerical simulation
- University of New South Wales
- Publisher URL
- Copyright © 2011.
- Peer reviewed