Cristin-resultat-ID: 2023622
Sist endret: 10. februar 2023, 12:24
NVI-rapporteringsår: 2022
Resultat
Vitenskapelig artikkel
2022

The use of hydrogen as a potential reductant in the chromite smelting industry

Bidragsytere:
  • Jamey Davies
  • Dogan Paktunc
  • José Juan Ramos-Hernandez
  • Merete Tangstad
  • Eli Ringdalen
  • Johan P. Beukes
  • mfl.

Tidsskrift

Minerals
ISSN 2075-163X
e-ISSN 2075-163X
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2022
Volum: 12
Hefte: 5
Artikkelnummer: 534
Open Access

Importkilder

Scopus-ID: 2-s2.0-85128768816

Beskrivelse Beskrivelse

Tittel

The use of hydrogen as a potential reductant in the chromite smelting industry

Sammendrag

The chromium (Cr) content of stainless steel originates from recycled scrap and/or ferrochrome (FeCr), which is mainly produced by the carbothermic reduction of chromite ore. Ever-increasing pressure on FeCr producers to curtail carbon emissions justifies migration from traditional FeCr production routes. The interaction between hydrogen and chromite only yields water, foregoing the generation of significant volumes of CO-rich off-gas during traditional smelting procedures. For this reason, the use of hydrogen as a chromite reductant is proposed. In addition to thermodynamic modelling, the influence of temperature, time, and particle size on the reduction of chromite by hydrogen was investigated. It was determined that, at the explored reduction parameters, the iron (Fe)-oxides presented in chromite could be metalized and subsequently removed by hot-acid leaching. The Cr-oxide constituency of chromite did not undergo appreciable metalization. However, the removal of Fe from the chromite spinel allowed the formation of eskolaite with the composition of (Cr1.4Al0.6)O3 in the form of an exsolved phase, which may adversely affect the reducibility of chromite. The study includes the limitations of incorporating hydrogen as a reductant into existing FeCr production infrastructure and proposes possible approaches and considerations.

Bidragsytere

Jamey Davies

  • Tilknyttet:
    Forfatter
    ved North-West University

Dogan Paktunc

  • Tilknyttet:
    Forfatter
    ved Natural Resources Canada

José Juan Ramos-Hernandez

  • Tilknyttet:
    Forfatter
    ved Universidad Nacional Autónoma de México (UNAM)

Merete Tangstad

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

Eli Ringdalen

  • Tilknyttet:
    Forfatter
    ved Metallproduksjon og prosessering ved SINTEF AS
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