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Phase Transformation Law of Manganese and Iron Oxides in Ferromanganese Ore During Gas-Based Simultaneous Reduction Roasting

  • Characterization Techniques and Methods for Low-Carbon Metallurgical Processes
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Abstract

Manganese is widely used in the iron and steel industry, batteries and other fields. The amount of the manganese oxide ores existing in China coeval with iron and their manganese-to-iron ratio is low. A study was conducted on a synchronous reduction roasting-magnetic separation of a ferromanganese ore with high content of iron taken from South Africa using CO as reductant. Under the conditions of 750°C roasting temperature, 40 min roasting time, 30% CO concentration roasting atmosphere and − 0.074 mm accounting for 82.56% grinding fineness, the iron removal rate was close to 70% through magnetic separation, with the grade and manganese recovery of manganese concentrate reaching 49% and 72.50% and the manganese-to-iron ratio increasing from 2.5 to 5.92. The X-ray diffraction analysis indicated that Mn2O3 and Fe2O3 in the raw ore was reduced to MnO and Fe3O4, respectively, without forming the intermediate product Mn3O4 in a weak reducing atmosphere. The SEM-EDS analysis of the roasted product showed that the simultaneous reduction of manganese and iron oxides could be achieved when the roasting temperature reaches 750°C. The crystal forms of MnO and Fe3O4 were more perfect, and the coexisting grains of Ca, Si and Al clustered further with increasing roasting temperature.

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Acknowledgements

The authors are grateful to the National Natural Science Foundation of China (Grant Nos. 51974204 and 52204276) and Key R&D Plan Projects in Hubei Province (Grant No. 2022BCA062).

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Authors and Affiliations

  1. School of Resources and Safety Engineering, Wuhan Institute of Technology, Wuhan, 430073, Hubei, China

    Meng-fei Li, Han-quan Zhang & Man-man Lu

  2. WISCO Resources Group Chengchao Mining Company Limited, Ezhou, 436051, China

    Xin Xu

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  1. Meng-fei Li
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  2. Han-quan Zhang
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  3. Xin Xu
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Correspondence to Man-man Lu.

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Li, Mf., Zhang, Hq., Xu, X. et al. Phase Transformation Law of Manganese and Iron Oxides in Ferromanganese Ore During Gas-Based Simultaneous Reduction Roasting. JOM (2024). https://doi.org/10.1007/s11837-024-06566-7

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