Cristin-resultat-ID: 1755286
Sist endret: 23. januar 2020 13:44
NVI-rapporteringsår: 2019
Resultat
Vitenskapelig artikkel
2019

An EXAFS and XANES study of V, Ni, and Fe speciation in cokes for anodes used in aluminum production

Bidragsytere:
  • Gøril Jahrsengene
  • Hannah C. Wells
  • Camilla Sommerseth
  • Arne Petter Ratvik
  • Lorentz Petter Lossius
  • Katie H. Sizeland
  • mfl.

Tidsskrift

Metallurgical and Materials Transactions B
ISSN 1073-5615
e-ISSN 1543-1916
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2019
Publisert online: 2019
Trykket: 2019
Volum: 50
Hefte: 6
Sider: 2969 - 2981
Open Access

Importkilder

Scopus-ID: 2-s2.0-85074354111

Beskrivelse Beskrivelse

Tittel

An EXAFS and XANES study of V, Ni, and Fe speciation in cokes for anodes used in aluminum production

Sammendrag

Lower-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.

Bidragsytere

Gøril Jahrsengene

  • Tilknyttet:
    Forfatter
    ved Institutt for materialteknologi ved Norges teknisk-naturvitenskapelige universitet

Hannah C. Wells

  • Tilknyttet:
    Forfatter
    ved Massey University

Camilla Sommerseth

  • Tilknyttet:
    Forfatter
    ved Metallproduksjon og prosessering ved SINTEF AS
Aktiv cristin-person

Arne Petter Ratvik

  • Tilknyttet:
    Forfatter
    ved Metallproduksjon og prosessering ved SINTEF AS

Lorentz Petter Lossius

  • Tilknyttet:
    Forfatter
    ved Norsk Hydro ASA
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