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dc.contributor.authorJahrsengene, Gøril
dc.contributor.authorWells, Hannah C.
dc.contributor.authorSommerseth, Camilla
dc.contributor.authorRatvik, Arne Petter
dc.contributor.authorLossius, Lorentz Petter
dc.contributor.authorSizeland, Katie H.
dc.contributor.authorKappen, Peter
dc.contributor.authorSvensson, Ann Mari
dc.contributor.authorHaverkamp, Richard G.
dc.date.accessioned2020-01-21T08:11:09Z
dc.date.available2020-01-21T08:11:09Z
dc.date.created2019-12-02T10:33:43Z
dc.date.issued2019
dc.identifier.citationMetallurgical and materials transactions. B, process metallurgy and materials processing science. 2019, 50 (6), 2969-2981.nb_NO
dc.identifier.issn1073-5615
dc.identifier.urihttp://hdl.handle.net/11250/2637113
dc.description.abstractLower-quality petroleum coke with higher levels of sulfur and metal impurities will have to be used for the manufacturing of anodes for aluminum production in the future. The sulfur and metallic impurities affect the anode properties in the aluminum production process, but the chemical identity of the metal species in the coke is not known. In this study, industrial petroleum cokes with high sulfur levels were analyzed by X-ray absorption near edge structure (XANES) and Extended X-ray absorption fine structure (EXAFS) in order to determine the identity of the V, Ni, and Fe impurities. The XANES spectra were compared with pure-phase standards. EXAFS was used to compare the impurity metal structures with known crystal structures. It was found that V is present mainly as hexagonal V3S4. Ni is present mainly as hexagonal NiS, and Fe is present as hexagonal FeS. This knowledge of the chemical states of the metal elements in coke, which are known to affect anode performance, is the first step in understanding the mechanism of the action of these elements on anode reactivity.nb_NO
dc.language.isoengnb_NO
dc.publisherSpringernb_NO
dc.titleAn EXAFS and XANES Study of V, Ni, and Fe Speciation in Cokes for Anodes Used in Aluminum Productionnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber2969-2981nb_NO
dc.source.volume50nb_NO
dc.source.journalMetallurgical and materials transactions. B, process metallurgy and materials processing sciencenb_NO
dc.source.issue6nb_NO
dc.identifier.doi10.1007/s11663-019-01676-z
dc.identifier.cristin1755286
dc.relation.projectNorges forskningsråd: 236665nb_NO
dc.description.localcodeThis is a post-peer-review, pre-copyedit version of an article. Locked until 4.09.2020 due to copyright restrictions. The final authenticated version is available online at: 10.1007/s11663-019-01676-znb_NO
cristin.unitcode194,66,35,0
cristin.unitnameInstitutt for materialteknologi
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2


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