A Study of Some Aspects of the Influence of Cell Operation on Cathode Life

There are many identifiable causes that can contribute to the ultimate failure of an aluminium reduction cell. They can be broadly classified within the bounds of cell design, materials of construction, method of construction and preheating and lastly, cell operational history. This contribution correlates data obtained from a programme of failed cell autopsies with observations of cell design and operation in relation to the ultimate cause of failure. The following aspects were determined to be of particular importance in achieving a good pot life: A sidewall design which can maintain stable heat transfer conditions over the life expectancy of the cell. Heat-up and start-up procedures which preserve as near as possible the integrity of the lining materials. Operating parameters which minimise temperature disturbances or ‘sickness’ incidents during the life of the cell.