Journal of Northeastern University Natural Science ›› 2016, Vol. 37 ›› Issue (12): 1720-1725.DOI: 10.12068/j.issn.1005-3026.2016.12.011

• Materials & Metallurgy • Previous Articles     Next Articles

Effects of Reducing Time on Metallization Degree of Carbothermic Reduction of Tall Pellets Bed

JIANG Xin1, WANG Lin2, LIU Ming-xu1, SHEN Feng-man1   

  1. 1. School of Metallurgy, Northeastern University, Shenyang 110819, China; 2. Department of Mechanical Engineering, Shenyang Institute of Engineering, Shenyang 110136, China.
  • Received:2015-07-17 Revised:2015-07-17 Online:2016-12-15 Published:2016-12-23
  • Contact: JIANG Xin
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Abstract: To explore the operation parameters of the direct reduction processing using the paired straight hearth furnace (PSH), the effects of reducing time on metallization degree of carbothermic reduction of tall pellets bed are investigated in this work. The experimental results show that, when the reducing time is set to 50 and 60min, the metallization degree (MD) of the total pellets bed is 57.31% and 80.23%, respectively. However, there are some disadvantages in the case of 60min, such as re-oxidation of the pellets in the top bed, low heat efficiency, and low productivity. Charging with hot crucible can increase the MD of the pellets, especially for the pellets in the bottom bed. In the case of 50min, the MD of the total pellets bed increases from 57.31% charging with cold crucible to 85.24% charging with hot crucible. Therefore, the hot crucible charge and the 50min of reducing time are suggested for increasing the MD of carbothermic reduction of tall pellets bed, which could provide a guideline for developing the effective reduction process in PSH.

Key words: carbothermic reduction, metallization degree, tall pellets bed, reducing time, hot charge

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