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Light Metals 2020 pp 803–810Cite as

Recycling of the Flue Gas from Aluminium Electrolysis Cells

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Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

Abstract

Recycling of the flue gas from aluminium reduction cells is a possible method for increasing the CO2 concentration, thereby enabling CO2 capture. The present paper represents a preliminary study concerning some of the consequences in the electrolysis cells. The energy balance in a hypothetic 400 kA cell was estimated, and it turned out that the heat flow into the superstructure could be kept constant by decreasing the thickness of the anode cover material even with a very hot gas. Recycling gives a higher amount of collectible heat from the cells, mainly because of higher temperature in the gas entering the cell. It will be advantageous to apply catalytic burning of CO to CO2, which represents considerable extra heat. Increased sulfuric acid dewpoint may represent a challenge. It is also necessary to address the amount of hydrogen fluoride that re-evolves from the secondary alumina at high superstructure temperature.

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Authors and Affiliations

  1. SINTEF, 4760, Torgarden, 7465, Trondheim, Norway

    Asbjørn Solheim & Samuel Senanu

Authors
  1. Asbjørn Solheim
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  2. Samuel Senanu
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Correspondence to Asbjørn Solheim .

Editor information

Editors and Affiliations

  1. Rio Tinto, Brisbane, QLD, Australia

    Alan Tomsett

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© 2020 The Minerals, Metals & Materials Society

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Solheim, A., Senanu, S. (2020). Recycling of the Flue Gas from Aluminium Electrolysis Cells. In: Tomsett, A. (eds) Light Metals 2020. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-36408-3_107

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