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Carbothermal Reduction of Manganese Oxide in Different Gas Atmospheres

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Abstract

Carbothermal reduction of manganese oxides was studied in hydrogen, helium, and argon at different temperatures and carbon-to-manganese oxide ratios. Isothermal and temperature programmed carbothermal reduction experiments were conducted in a fixed bed reactor in a vertical tube furnace, with on-line monitoring of gas composition by the CO-CO2 infrared sensor. The extent of reduction was calculated using the off-gas composition and LECO oxygen contents in the reduced samples. In all gas atmospheres, the reaction rate increased with temperature. The reduction rate of manganese oxide in hydrogen was higher than in helium, and in helium higher than in argon. This was attributed to the involvement of hydrogen in the reduction process and the difference in CO and CO2 diffusion coefficients in helium and argon.

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Notes

  1. LECO is a trademark of LECO Corporation, St. Joseph, MI.

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Acknowledgments

This research was supported under the Australian Research Council’s Linkage Projects funding scheme (Project No. LP0228735) and the Tasmanian Electrometallurgical Company. One of the authors (OO) is the recipient of an Australian Research Council Professorial Fellowship (Project No. DP0771059).

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of New South Wales, Sydney, NSW, 2052, Australia

    Ring Kononov (Postdoctoral Student, Research Associate) & Oleg Ostrovski (Professor)

  2. Tasmanian Electrometallurgical Company, Bell Bay, Tasmania, 7253, Australia

    Samir Ganguly (Technical Manager)

Authors
  1. Ring Kononov
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  2. Oleg Ostrovski
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  3. Samir Ganguly
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Correspondence to Ring Kononov.

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Manuscript submitted April 9, 2008.

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Kononov, R., Ostrovski, O. & Ganguly, S. Carbothermal Reduction of Manganese Oxide in Different Gas Atmospheres. Metall Mater Trans B 39, 662–668 (2008). https://doi.org/10.1007/s11663-008-9191-1

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