Advertisement

Improving Anode Cover Material Quality at Nordural — Quality Tools and Measures

  • Halldor Gudmundsson

Abstract

Anode cover material (ACM) composition and granulometry determines the properties of the anode cover. This paper describes the experience Nordural has had with a new ACM mixing station employing autogeneous milling and pressure vessel conveying of the material to the potrooms. The pros and cons of this system for delivering the required granulometry is discussed by showing the evolution of the ACM granulometry before and after the commissioning of the new mixing station. To evaluate the effect of the conveying system the granulometry of the material at the output of the mixing station is compared with the granulometry of the material on the anodes. The automated XRD/XRF method for bath analysis has also been used for evaluating the alumina- and chiolite composition of the ACM which can impact the bath mass balance and structural stability. Finally, heat flux data is shown as one measure of quality.

Keywords

Anode Cover Material Bath Processing Granulometry Autogeneous Milling 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Reference

  1. 1.
    S. Wilkening, P. Reny, B. Murphy, “Anode Cover Material and Bath Level Control”, Light Metals 2005, pp. 367–372.Google Scholar
  2. 2.
    N.E. Richards, “Anode Covering Practices”, Proceedings of the 6th Australasian Aluminium Smelting Technology Conference and Worskhop, Queenstown, New Zealand, 22–27th Nov. 1998, pp.143–152.Google Scholar
  3. 3.
    W. Kristensen, G. Hoskuldsson, O. Jonsson, “Improvements in Smelter Performance through Operating Practices and Process Control”, Proceedings of the 8th Australasian Aluminium Smelting Technology Conference and Worskhop, Yeppoon, Australia, 3–8th Oct. 2004.Google Scholar
  4. 4.
    M.P. Taylor, “Anode Cover Material Science, Practice and Future Needs”, Proceedings of the 9th Australasian Aluminium Smelting Technology Conference and Worskhop, Terrigal, Australia, 4–9th Nov. 2007.Google Scholar
  5. 5.
    X. Shen, “Top Cover and Energy Balance in Hall-Heroult Cells”, (Ph.D. thesis, University of Auckland), New Zealand, 2003.Google Scholar
  6. 6.
    A.B. Yu and RP. Zou, “Modifying the Linear Packing Model for Predicting the Porosity of Non-Spherical Particle Mixture”, Industrial Engineering Chemistry Research, 35 (1996), pp. 3730–3741CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society 2016

Authors and Affiliations

  • Halldor Gudmundsson
    • 1
  1. 1.Nordural-Century Aluminum LtdGrundartangi; AkranesIceland

Personalised recommendations