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Swelling behavior of hot preheated pellets in reduction roasting process

  • Materials, Metallurgy, Chemical and Environmental Engineering
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Abstract

One kind of facile coal-based direct reduction process is using hot preheated pellets for reduction in grate kiln. In this work, effects of reduction parameters on swelling index of hot preheated pellets were investigated by photographic technique under isothermal conditions. Experimental results show that swelling index of pellets is firstly increased then gradually decreased with increasing reduction time, while that is found to be an obvious decrease from 175 % to 30% with the variation of temperature from 900 °C to 1100 °C. Results of XRD combined with SEM reveal that swelling behavior of pellets is decided by structure of newly formed metal iron grains. The formation and growth of fibers iron grains promote the increase in volume. Low temperature and low CO content are favored to the formation and orientated growth of metal iron grains in the one step process.

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Authors and Affiliations

  1. School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, 450001, China

    Gui-hong Han  (韩桂洪), Duo Zhang  (张多) & Yan-fang Huang  (黄艳芳)

  2. School of Mineral Processing and Bioengineering, Central South University, Changsha, 410083, China

    Tao Jiang  (姜涛)

Authors
  1. Gui-hong Han  (韩桂洪)
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  2. Duo Zhang  (张多)
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  3. Yan-fang Huang  (黄艳芳)
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  4. Tao Jiang  (姜涛)
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Corresponding author

Correspondence to Yan-fang Huang  (黄艳芳).

Additional information

Foundation item: Projects(51404213, 51404214, 51674225) supported by the National Natural Science Fundation of China; Project(1421324065) supported by the Development Fund for Outstanding Young Teachers of Zhengzhou University, China

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Han, Gh., Zhang, D., Huang, Yf. et al. Swelling behavior of hot preheated pellets in reduction roasting process. J. Cent. South Univ. 23, 2792–2799 (2016). https://doi.org/10.1007/s11771-016-3342-3

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  • DOI: https://doi.org/10.1007/s11771-016-3342-3

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