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Preparation of Reduced Iron Powders from Mill Scale with Microwave Heating: Optimization Using Response Surface Methodology

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Abstract

Preparation of the reduced iron powder has been attempted with mill scale as the iron-bearing material and with wood charcoal as the reducing agent through microwave heating. The response surface methodology (RSM) is used to optimize the process conditions, with wood charcoal, process temperature, and holding time being the three process parameters. The regressed model equation eliminating the insignificant parameters through an analysis of variance (ANOVA) was used to optimize the process conditions. The optimum process parameters for the preparation of reduced iron powders have been identified to be the wood charcoal of 13.8 pct, a process temperature of 1391 K (1118 °C), and a holding time of 43 minutes. The optimum conditions resulted in reduced iron powders with a total iron content of 98.60 pct and a metallization ratio of 98.71 pct. X-ray fluorescence (XRF) was used to estimate the elemental contents of the reduced iron powder, which meets the specification of the HY100.23 first-class iron powder standard. Additionally X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), and scanning electron microscopy (SEM) analysis were performed and the results are compiled.

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Acknowledgments

Financial support from the National Natural Science Foundation of China (no. 51090385) and the National Basic Research Program of China (no. 2007CB613606) is sincerely acknowledged.

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Authors and Affiliations

  1. State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province, Kunming, P.R. China

    Qianxu Ye (Master Student), Hongbo Zhu (Associate Professor), Jinhui Peng (Professor), Jian Chen (Master Student) & Linqing Dai (Doctor)

  2. Key Laboratory of Unconventional Metallurgy, Ministry of Education and Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, P.R. China

    Qianxu Ye (Master Student), Hongbo Zhu (Associate Professor), Jinhui Peng (Professor), Jian Chen (Master Student) & Linqing Dai (Doctor)

  3. Chemical Engineering Program, The Petroleum Institute, Abu Dhabi, United Arab Emirates

    C. Srinivasa Kannan (Professor)

  4. Changchun Gold Research Institute, Changchun, 130012, P.R. China

    Peng Liu (Assistant Engineer)

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  1. Qianxu Ye
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  2. Hongbo Zhu
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  3. Jinhui Peng
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  4. C. Srinivasa Kannan
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  5. Jian Chen
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  6. Linqing Dai
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  7. Peng Liu
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Corresponding authors

Correspondence to Hongbo Zhu or Jinhui Peng.

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Manuscript submitted September 24, 2012.

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Ye, Q., Zhu, H., Peng, J. et al. Preparation of Reduced Iron Powders from Mill Scale with Microwave Heating: Optimization Using Response Surface Methodology. Metall Mater Trans B 44, 1478–1485 (2013). https://doi.org/10.1007/s11663-013-9872-2

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  • DOI: https://doi.org/10.1007/s11663-013-9872-2

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