Investigation of the ledge structure in aluminum smelting cells

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dc.contributor.author Liu, Jingjing en
dc.contributor.author Wei, Shanghai en
dc.contributor.author Chen, John en
dc.contributor.author Wijayaratne, H en
dc.contributor.author Wang, Z en
dc.contributor.author Gao, B en
dc.contributor.author Taylor, Mark en
dc.date.accessioned 2019-11-24T20:56:10Z en
dc.date.issued 2020-01 en
dc.identifier.issn 1047-4838 en
dc.identifier.uri http://hdl.handle.net/2292/49067 en
dc.description.abstract In aluminum smelting cells, ledges freeze on to cell walls from the cryolitic bath when the temperature drops below the bath liquidus point. Modern cell design and control cause a suitable ledge profile to form and be maintained, in order to protect the cell walls from corrosive liquids (molten salts and Al metal) and ensure efficient current distribution and cell heat balance. During cell operation, a significant ledge, freezing and melting does occur following heat balance changes due to batch operations. The ledge formation mechanism has been studied at the laboratory scale in our previous work. It shows a linkage between the rate and directional nature of ledge growth and its structure as affected through a superheat change. An open ledge structure can dominate the laboratory ledge material growth or melt it out quickly when the superheat either decreases or increases, respectively. This paper begins the investigation of industrial ledge samples, in terms of structure and composition, primarily to identify whether the same ledge formation mechanism exists in industrial cells. In this study, as expected, the industrial ledge shows more complexity than the laboratory ledge; the open structure is different compared to the laboratory ledge due to the inclusion of carbon dust, a large thermal gradient across the ledge, and sufficient aging of the ledge in the cell. The comparison between the laboratory ledge and the industrial ledge has provided insight into the ledge growth mechanism in aluminum smelting cells. en
dc.description.uri https://catalogue.library.auckland.ac.nz/permalink/f/t37c0t/uoa_alma21156635220002091 en
dc.publisher Springer Verlag en
dc.relation.ispartofseries JOM Journal of the Minerals, Metals and Materials Society en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Investigation of the ledge structure in aluminum smelting cells en
dc.type Journal Article en
dc.identifier.doi 10.1007/s11837-019-03863-4 en
pubs.issue 1 en
pubs.begin-page 253 en
pubs.volume 72 en
dc.rights.holder Copyright: The author en
pubs.author-url http://link.springer.com/article/10.1007/s11837-019-03863-4 en
pubs.end-page 262 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 785362 en
pubs.org-id Engineering en
pubs.org-id Chemical and Materials Eng en
dc.identifier.eissn 1543-1851 en
pubs.record-created-at-source-date 2019-11-07 en
pubs.online-publication-date 2019-10-29 en


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