Reduction of Agglomerated Manganese Ores in a 150 kW Pilot Scale Furnace

  • Merete Tangstad
  • Thomas Brynjulfsen
  • Eli Ringdalen
Conference paper

Abstract

Manganese ore fines cannot be added to the submerged arc furnace directly as they will prevent even gas flow through the burden. Low gas permeability in the burden will lower the degree of pre-reduction of ore subsequently increase the carbon and energy consumption of the process. In order to utilize manganese ore fines in the furnace, they are typically agglomerated into sinter. In this work, the melting and reduction properties of Gabonese sinter and Gabonese ore have been investigated in pilot scale experiments. Two experiments were conducted, one with 100% sinter as manganese source and one with 50/50 sinter and ore. Lime was used to achieve a charge basicity of 0.72 in both experiments. The composition of slag samples from the excavation of the furnace was established using EPMA(WDS), and the composition of the tapped slag and metal was found using XRF. It was found that while the coke-bed size would determine the tapped slag composition, the melting behavior of the Mn source would determine the mixing with lime.

Keywords

manganese ferroalloys manganese sinter pilot scale experiments 

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References

  1. (1).
    S.E. Olsen, M. Tangstad, and T. Lindstad. Production of manganese ferroalloys. Tapir academic press, Trondheim, 2007Google Scholar
  2. (2).
    V. Olsø, M. Tangstad, and S. Olsen. Reduction kinetics of MnO saturated slags. Infacon VIII, 1998.Google Scholar
  3. (3).
    O. Ostrovski, S.E. Olsen, M. Tangstad, and M. Yastrebo_. Kinetic modeling of MnO reduction from manganese ore. Canadian Metallurgical Quarterly, Vol 41, 2002.Google Scholar
  4. (4).
    T.A. Skjervheim and S.E. Olsen. The rate and mechanism for reduction of manganese oxide from silicate slags. Conference proceedings Infacon 7, 1995.Google Scholar
  5. (5).
    T. Shimoo, S. Ando, and H. Kimura. Rates of MnO reduction from silicate slags with solid carbon. J.Japan Inst, metals Vol. 48 No.9, 1984.Google Scholar
  6. (6).
    G. Roghani, E. Jak, and P. Hayes. Phase equilibrium studies in the MnO-Al2O3-SiO2 system. Metallurgical and materials transactions B, 2002.Google Scholar
  7. (7).
    SlagAtlas. Slag atlas 2nd edition, page 116. Verlag Stahleisen GmbH, 1995.Google Scholar
  8. (8).
    B. Monsen, M. Tangstad, I. Solheim, M. Syvertsen, R. Ishak, and H. Midtgaard: Charcoal for manganese alloy production. Infacon XI conference proceeding, 2007.Google Scholar
  9. (9).
    P.A. Eidem. Electrical resistivity of coke bed. PhD-Thesis, Norwegian university of science and technology, 2008.Google Scholar
  10. (10).
    E. Ringdalen and M. Tangstad. Study of SiMn production in pilot scale experiments-comparing Carajas sinter and Assmang ore. Infacon XIII conference proceedings, volume 1, pp 195–206, 2013.Google Scholar
  11. (11).
    Olsen, S.E, Tangstad, M, Silicomanganese production — Process Understanding, Infacon X, 2004, Cape Town, South AfricaGoogle Scholar
  12. (12).
    T. Brynjulfsen; Reduction of manganese ore agglomerates, PhD thesis, NTNU, Trondheim, Norway, to be published fall 2013.Google Scholar
  13. (13).
    D. Slizovskiy, M. Tangstad, and S. Wasbo. Melting temperatures of ore forferromanganeseproduction. To be published 2013.Google Scholar
  14. (14).
    S. Gaal, D. Lou, S. Wasbo, B. Ravary, and M. Tangstad. Melting phenomena in ferromanganese production. Infacon XI conference proceedings, 2007.Google Scholar
  15. (15).
    E. Ringdalen, S. Gaal, M. Tangstad, and O. Ostrovski. Ore melting and reduction in silicomangane se production. Metallurgical and materials transactions 41B, 2010.Google Scholar

Copyright information

© TMS (The Minerals, Metals & Materials Society) 2014

Authors and Affiliations

  • Merete Tangstad
    • 1
  • Thomas Brynjulfsen
    • 1
  • Eli Ringdalen
    • 2
  1. 1.Norwegian University of Science and TechnologyTrondheimNorway
  2. 2.SINTEFTrondheimNorway

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