An experimental study of aluminium electrowinning using a nickel-based hydrogen diffusion anode

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dc.contributor.author Namboothiri, S en
dc.contributor.author Taylor, Mark en
dc.contributor.author Chen, John en
dc.contributor.author Hyland, Margaret en
dc.contributor.author Cooksey, MA en
dc.date.accessioned 2011-11-17T17:43:20Z en
dc.date.issued 2011 en
dc.identifier.citation Electrochimica Acta 56(9):3192-3202 2011 en
dc.identifier.issn 0013-4686 en
dc.identifier.uri http://hdl.handle.net/2292/9347 en
dc.description.abstract Laboratory scale electrolysis experiments were conducted to investigate the electrowinning of aluminium using hydrogen diffusion anodes. A potassium-based electrolyte (KF–AlF3–Al2O3), porous nickel alloy anode and molybdenum disk cathode were used in experiments at 750 ◦ C. Hydrogen gas was supplied to the anode/electrolyte interface through the porous anode. Experiments were conducted in potentiostatic, galvanostatic and galvanodynamic modes. There was a measurable depolarisation of the anode potential and also anode reaction of hydrogen and oxygen ions in the bath to form water vapour was confirmed by the water vapour condensate found at the electrolysis exit gas pipe. Metallic aluminium was found on the spent cathode. The experiments conducted in the galvanodynamic mode suggested that the rate limiter for hydrogen oxidation was the availability of surface hydrogen at the anode/electrolyte interface. The anode surface corroded during electrolysis and impurities were found both in the molten bath and on the cathode. en
dc.publisher Elsevier Ltd. en
dc.relation.ispartofseries Electrochimica Acta 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. Details obtained from http://www.sherpa.ac.uk/romeo/issn/0013-4686/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title An experimental study of aluminium electrowinning using a nickel-based hydrogen diffusion anode en
dc.type Journal Article en
dc.identifier.doi 10.1016/j.electacta.2011.01.055 en
pubs.issue 9 en
pubs.begin-page 3192 en
pubs.volume 56 en
dc.rights.holder Copyright: Elsevier Ltd. en
pubs.end-page 3202 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 209479 en
pubs.org-id Engineering en
pubs.org-id Chemical and Materials Eng en
pubs.record-created-at-source-date 2011-07-06 en


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