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Microwave Dielectric Properties and Reduction Behavior of Low-Grade Pyrolusite

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A Correction to this article was published on 13 May 2020

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Abstract

Manganese ore is an important mineral having a strategic role in the development of the national economy and society. In this study, the dielectric properties, heating curve, crystal structure, and reduction ratio of a low-grade pyrolusite were investigated. The dielectric constant, dielectric loss factor, and loss tangent coefficient of low-grade pyrolusite at room temperature were evaluated using the resonant cavity perturbation method, yielding values of 5.854, 0.146, and 0.0249, respectively. Owing to the excellent microwave absorption properties of low-grade pyrolusite with 10% coal (22 g), it could be heated to a temperature of 800°C within 200 s. X-ray diffraction results confirmed that MnO2 was partially transformed into MnO at 450°C, while, at 650°C, no diffraction peak of MnO2 was observed. At a reduction temperature of 550°C, a reduction ratio of MnO2 to MnO of 96.65% could be achieved within a holding time of 50 min. This study demonstrates that the microwave carbothermal reduction of a low-grade pyrolusite is efficient, and thus could promote the clean production and sustainable development of the manganese industry.

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  • 13 May 2020

    Corresponding author designation is missing for Jin Chen in the original publication of this article.

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Acknowledgements

Financial support from the National Scientific Foundation of China (No.: U1802255), the Key Projects in the National Science & Technology Pillar Program during the Twelfth Five-year Plan Period (No. 2015BAB17B00), the Hunan Provincial Science and Technology Plan Project, China (No. 2016TP1007), and Innovative Research Team (in Science and Technology) in University of Yunnan Province were sincerely acknowledged.

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Authors and Affiliations

  1. Key Laboratory of Unconventional Metallurgy, Ministry of Education, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, People’s Republic of China

    Fei He, Jin Chen, Guo Chen & Jinhui Peng

  2. Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Yunnan Minzu University, Kunming, 650500, People’s Republic of China

    Jin Chen, Guo Chen & Roger Ruan

  3. Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Central South University, Changsha, 410083, Hunan, People’s Republic of China

    Guo Chen

  4. Center for Biorefining, Bioproducts and Biosystems Engineering Department, University of Minnesota, 1390 Eckles Ave., Saint Paul, MN, 55108, USA

    Roger Ruan

  5. Chemical Engineering Department, Khalifa University of Science and Technology, Abu Dhabi, UAE

    C. Srinivasakannan

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  1. Fei He
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  2. Jin Chen
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  3. Guo Chen
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  4. Jinhui Peng
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  5. C. Srinivasakannan
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  6. Roger Ruan
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Correspondence to Guo Chen.

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He, F., Chen, J., Chen, G. et al. Microwave Dielectric Properties and Reduction Behavior of Low-Grade Pyrolusite. JOM 71, 3909–3914 (2019). https://doi.org/10.1007/s11837-019-03522-8

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  • DOI: https://doi.org/10.1007/s11837-019-03522-8

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