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Effect of Sintering and Porosity Development on Direct Reduction of Manganese Ore Pellets

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Abstract

High manganese steels with > 10% Mn offer a combination of high tensile strength and good ductility, two critical properties for automotive steels. Conventional routes to produce the Mn units used for steelmaking are energy- and capital-intensive. Therefore, a novel methane-based solid-state reduction process for manganese ore pellets is under investigation. It was found in preliminary tests that the reduction of ore pellets by methane was limited by gas transport to the pellet interior. To enhance the reducibility of Mn ore pellets, this study aimed at improving pellet porosity through adjustment of Mn ore powder particle size and the addition of limestone, which thermally decomposes to CaO and CO2. The change in compressive strength with an increase in pellet porosity was also studied. It was found that the increase in porosity as a result of limestone addition improves the reducibility of pellets and decreases the pellet strength. The effect of particle size on pellet reducibility was, however, more complicated because of the simultaneous change in the total surface area and sintering behavior of the particles.

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Acknowledgements

This work was completed with the partial financial support of the Natural Science and Engineering Research Council of Canada (NSERC, STPGP463252-14). The authors thank ArcelorMittal Dofasco, Stelco, Praxair and Hatch Ltd. for their in-kind support and technical advice.

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  1. Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, ON, M5S 3E4, Canada

    Xi Ling, Richard Elliott & Mansoor Barati

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  1. Xi Ling
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  2. Richard Elliott
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  3. Mansoor Barati
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Correspondence to Xi Ling.

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Ling, X., Elliott, R. & Barati, M. Effect of Sintering and Porosity Development on Direct Reduction of Manganese Ore Pellets. JOM 73, 334–344 (2021). https://doi.org/10.1007/s11837-020-04479-9

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  • DOI: https://doi.org/10.1007/s11837-020-04479-9

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