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In situ neutron diffraction study of the reduction of New Zealand ironsands in dilute hydrogen mixtures

Journal Article


Abstract


  • The reduction of New Zealand titanomagnetite ironsand in a dilute hydrogen–nitrogen gas

    mixture was studied in situ using neutron diffraction. Neutron diffraction allowed in situ

    observation of large samples during reduction at high temperatures. Australian hematite ore,

    studied as a comparison, reduced much more quickly than the pre-oxidised ironsand, which

    in turn reduced more quickly than raw ironsand. The ironsand was predominantly

    titanomagnetite with small amounts of titanohematite. The rate of wüstite formation

    increased and metallic iron was formed only after the reduction of titanohematite.

    Experimental results confirmed the expected reduction pathway for initial reduction of

    titanomagnetite ore was described well by a three-interface shrinking core model. The rate

    controlling step in the reduction reactions studied was the mass transport of water vapour in

    the bulk gas. At higher temperatures, slow removal of water vapour meant that the pH2O

    increased, thus preventing reduction of wüstite to metallic iron.

Authors


  •   Longbottom, Raymond J.
  •   Ingham, Bridget (external author)
  •   Reid, Mark H. (external author)
  •   Studer, Andrew J. (external author)
  •   Bumby, Christopher W. (external author)
  •   Monaghan, Brian J.

Publication Date


  • 2019

Citation


  • Longbottom, R. James., Ingham, B., Reid, M. Henry., Studer, A. J., Bumby, C. W. & Monaghan, B. Joseph. (2019). In situ neutron diffraction study of the reduction of New Zealand ironsands in dilute hydrogen mixtures. Transactions of the Institutions of Mining and Metallurgy, Section C: Mineral Processing and Extractive Metallurgy, 128 (3), 183-192.

Scopus Eid


  • 2-s2.0-85054018577

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/1302

Number Of Pages


  • 9

Start Page


  • 183

End Page


  • 192

Volume


  • 128

Issue


  • 3

Place Of Publication


  • United Kingdom

Abstract


  • The reduction of New Zealand titanomagnetite ironsand in a dilute hydrogen–nitrogen gas

    mixture was studied in situ using neutron diffraction. Neutron diffraction allowed in situ

    observation of large samples during reduction at high temperatures. Australian hematite ore,

    studied as a comparison, reduced much more quickly than the pre-oxidised ironsand, which

    in turn reduced more quickly than raw ironsand. The ironsand was predominantly

    titanomagnetite with small amounts of titanohematite. The rate of wüstite formation

    increased and metallic iron was formed only after the reduction of titanohematite.

    Experimental results confirmed the expected reduction pathway for initial reduction of

    titanomagnetite ore was described well by a three-interface shrinking core model. The rate

    controlling step in the reduction reactions studied was the mass transport of water vapour in

    the bulk gas. At higher temperatures, slow removal of water vapour meant that the pH2O

    increased, thus preventing reduction of wüstite to metallic iron.

Authors


  •   Longbottom, Raymond J.
  •   Ingham, Bridget (external author)
  •   Reid, Mark H. (external author)
  •   Studer, Andrew J. (external author)
  •   Bumby, Christopher W. (external author)
  •   Monaghan, Brian J.

Publication Date


  • 2019

Citation


  • Longbottom, R. James., Ingham, B., Reid, M. Henry., Studer, A. J., Bumby, C. W. & Monaghan, B. Joseph. (2019). In situ neutron diffraction study of the reduction of New Zealand ironsands in dilute hydrogen mixtures. Transactions of the Institutions of Mining and Metallurgy, Section C: Mineral Processing and Extractive Metallurgy, 128 (3), 183-192.

Scopus Eid


  • 2-s2.0-85054018577

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/1302

Number Of Pages


  • 9

Start Page


  • 183

End Page


  • 192

Volume


  • 128

Issue


  • 3

Place Of Publication


  • United Kingdom