Roles of Mn Carbides in Carbothermic Processes for Mn Alloys

  • Byeong Deok Lee
  • Hyun Kyu Shin
  • Young Eun Lee
Conference paper

Abstract

The reduction of Mn oxides at pre-smelting steps is an integral part of smelting processes for Mn alloys, and an understanding of its reaction mechanism is expected to contribute to the improvement of processing efficiency for Mn alloys smelting. The phase diagram shows that five Mn carbides are operative in the Mn-C system. Although they are expected to participate in the reduction of Mn oxides, no specific information is available yet to clarify their roles in pre-smelting carbothermic reaction of Mn oxides.

Experiments with composite pellets prepared with Mn oxides and graphite powders show that Mn3O4 is reduced initially to MnO at about 1130°C and, subsequently, to Mn7C3 carbide as temperature increases further. At 1331°C, Mn7C3 carbide dissociates to Mn alloy and carbon. The degree of reducing reaction increases with increasing carbon balance in composite pellets and increasing temperatures.

Keywords

Mn carbides smelting of Mn oxides Mn alloys 

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References

  1. 1.
    H. Okamoto, eds., 2000 Desk Handbook Phase Diagrams for Binary Alloys, ASM International, Materials Park, OHGoogle Scholar
  2. 2.
    Y. Yamada, et al., “Metal carbide-carbon peritectic systems as high-temperature fixed points in thermometry”, Metrologia, 43 (2006), L23–L27CrossRefGoogle Scholar

Copyright information

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

Authors and Affiliations

  • Byeong Deok Lee
    • 1
  • Hyun Kyu Shin
    • 1
  • Young Eun Lee
    • 1
  1. 1.Dongbu Metal CompanyDonghae, Gangwon-doRepublic of Korea

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