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Influence of Phosphorus on Current Efficiency in Aluminum Electrolysis at Different Current Densities

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dc.contributor Háskólinn í Reykjavík
dc.contributor Reykjavik University
dc.contributor.author Meirbekova, Rauan
dc.contributor.author Haarberg, Geir Martin
dc.contributor.author Thonstad, Jomar
dc.contributor.author Saevarsdottir, Gudrun Arnbjorg
dc.date.accessioned 2020-03-19T13:29:07Z
dc.date.available 2020-03-19T13:29:07Z
dc.date.issued 2017
dc.identifier.citation Meirbekova, R., Haarberg, G. M., Thonstad, J., & Saevarsdottir, G. (2017). Influence of Phosphorus on Current Efficiency in Aluminum Electrolysis at Different Current Densities. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 164(7), E161–E165. https://doi.org/10.1149/2.0941707jes
dc.identifier.issn 0013-4651
dc.identifier.issn 1945-7111 (eISSN)
dc.identifier.uri https://hdl.handle.net/20.500.11815/1621
dc.description.abstract Many factors may contribute to loss of current efficiency (CE) in aluminum reduction and one of them is a presence of impurities. In this work, the effect of phosphorus on CE is studied in a laboratory cell at different current densities. Due to a growing trend toward higher amperage in retrofitted industrial cells, a study is performed both at a representative industrial current density (0.8 A/cm(2)) and at a high current density (1.5 A/cm(2)). More resolution was obtained at phosphorus levels comparable to typical industrial concentration in aluminum reduction cell (0-220 mg/kg). It is shown that the effect of phosphorus on the CE is more significant at high current density. Trend lines for the whole concentration range btw. 0 and 630 mg/kg showed a decrease of 1.1% in CE per 100 mg/kg for the high current density and 0.67% per 100 mg/kg at the low current density. The detrimental effect was more pronounced for relatively low phosphorus contents up to 220 mg/kg. A trend line for that smaller range revealed a reduction of 2.5% per 100 mg/kg of phosphorus at 1.5 A/cm(2), while at 0.8 A/cm(2) a reduction of 0.92% per 100 mg/kg of phosphorus was obtained. This indicates that increasing amperage in retrofitted cells may amplify the detrimental effect of impurities on the current efficiency.
dc.description.sponsorship Funding for this work was provided by Alcoa Fjardaal and HRV Engineering. Assistance from Manolescu and Sintef staff is gratefully acknowledged.
dc.format.extent E161-E165
dc.language.iso en
dc.publisher The Electrochemical Society
dc.relation.ispartofseries Journal of The Electrochemical Society;164(7)
dc.rights info:eu-repo/semantics/openAccess
dc.subject Electrochemistry
dc.subject Materials Chemistry
dc.subject Electronic, Optical and Magnetic Materials
dc.subject Surfaces, Coatings and Films
dc.subject Condensed Matter Physics
dc.subject Phosphorus
dc.subject Aluminium electrolysis
dc.subject Efnafræðileg eðlisfræði
dc.subject Raffræði
dc.subject Efnafræði
dc.subject Efnasambönd
dc.subject Ástand efnis
dc.subject Þéttefnisfræði
dc.subject Fosfór
dc.subject Ál
dc.subject Rafgreining
dc.title Influence of Phosphorus on Current Efficiency in Aluminum Electrolysis at Different Current Densities
dc.type info:eu-repo/semantics/article
dcterms.license This is an open access article distributed under the terms of the Creative CommonsAttribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND,http://creativecommons.org/licenses/by-nc-nd/4.0/),which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in anyway and is properly cited. For permission for commercial reuse, please email:oa@electrochem.org. [DOI:10.1149/2.0941707jes]
dc.description.version "Peer Reviewed"
dc.identifier.journal Journal of The Electrochemical Society
dc.identifier.doi 10.1149/2.0941707jes
dc.relation.url https://syndication.highwire.org/content/doi/10.1149/2.0941707jes
dc.contributor.school Tækni- og verkfræðideild (HR)
dc.contributor.school School of Science and Engineering (RU)

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