Potline Startup with Low Anode Effect Frequency
Nordural has had a policy of continuous improvements, including reducing the total carbon dioxide greenhouse gas equivalents by lowering anode effect frequency, gross and net carbon to the level where the smelters total attributable emissions (including allowance for anode baking) is less than 1800 kg CO2 equivalents / tonne of Al, The technology and work practice changes to achieve the improvements have been described elsewhere3.
For the start up of the second potline, further modifications were carried out to the cell pre-heat and start-up work practice to ensure a rapid, but manageable, potline commissioning using the existing work force. Four cells were started up in quick succession each day. Despite the normal problems associated with the commissioning new plant and equipment, during the start up of the first 100 cells the anode effect frequency, as counted from the time of bath-up of each cell was less than 0.09 anode effects per pot day with the average duration being similar to that of the established potline.
The Paper describes the design improvements, work practices and operating strategy used to achieve this smooth commissioning with a low demand on the work force.
KeywordsPotline startup Anode effect reduction
Unable to display preview. Download preview PDF.
- 1.W Kristensen, G Hoskuldsson, O Jonsson and B Welch “Moving Towards Zero Anode Effect Frequency While Achieving World Class KPI’s” Proceedings of the Third Anode Rodding Conference, Reykjavik, September 2005Google Scholar
- 2.M Dorreen, D Chin, J Lee, M M Hyland and B J Welch . “Sulphur and fluorine containing anode gases produced during normal electrolysis and approaching an anode effect”, Light Metals 1998 pp 311–316.Google Scholar
- 4.P Navarro. “Anew Anode Effect Quenching Procedure” in Light Metals 2003 pp 479–486Google Scholar
- 5.D Whitfield, “Aspects of Temperature in Aluminium Smelting” PhD Thesis, University of New South Wales 231 pages, (2004)Google Scholar
- 6.J Barclay, O Hung, & J Rigg. “Control of Electrochemical Cell Dynamics with Electrode Current Measurement” Light Metals 2001, pp1219–1224Google Scholar
- 7.P Navarro “Advances in Alumina Feed Control” In Special TMS session (CD Rom) 2003 Ed. A T TabereauxGoogle Scholar