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Chin. J. Process Eng. ›› 2017, Vol. 17 ›› Issue (2): 320-326.DOI: 10.12034/j.issn.1009-606X.216277

• Process & Technology • Previous Articles     Next Articles

 
The Sticking Mechanism of Pellets in COREX Shaft Furnace

DI Zhan-xia1,  LI Zheng-yi1,  LONG Hong-ming1*,  CHUN Tie-jun1,  MENG Qing-min1,  WANG Ping1,  LI Jia-xin1, 2   

  1.  1. School of Metallurgical Engineering, Anhui University of Technology, Ma¢anshan, Anhui 243002, China;
     2. School of Metallurgy, Northeastern University, Shenyang, Liaoning 110819, China
  • Received:2016-08-30 Revised:2016-10-11 Online:2017-04-20 Published:2017-04-19
  • Contact: LONG Hong-ming yaflhm@126.com

  COREX竖炉球团粘结机理

  狄瞻霞1，李正一1，龙红明1*，春铁军1，孟庆民1，王 平1，李家新1,2   

  1. 1. 安徽工业大学冶金工程学院，安徽 马鞍山 243002；
    2. 东北大学冶金学院. 辽宁 沈阳 110819
  • 通讯作者: 龙红明 yaflhm@126.com
  • 基金资助:
    国家自然科学基金

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Abstract: The reduction of pellets under load was done based on the simulating COREX reducing conditions. The influence of temperature, reduction gas composition and load on sticking was studied. Meanwhile, the microstructure and composition of sticking were analyzed by SEM-EDS and XRD. The results showed that the main composition of sticking was metallic iron and the pellets sticking belong to the solid phase bonding in the way of metallic irons diffusion and mutual infiltration. The sticking and metallization degree of pellets increases as the reduction temperature changes form 750℃ to 950℃. When the content of H2 increased, the sticking and metallization degree of pellets was improved. Load was another factor of worsening the sticking.

Key words: COREX pre-reduction shaft furnace, pellets, sticking, metallization degree

摘要： 模拟COREX竖炉还原条件进行铁矿球团荷重还原实验，研究了温度、还原气体成分、荷重对粘结的影响，并用SEM-EDS和XRD分析了不同条件下粘结物的矿相和成分. 结果表明，球团间的粘结物以铁为主，属于金属铁原子以扩散方式相互渗透的固相粘结类型；还原温度从750℃升至950℃，球团金属化率和粘结物强度均增大；随H2在还原气体中比例提高，球团金属化率及粘结情况均改善，荷重使球团间粘结加剧.

关键词: COREX预还原竖炉, 球团, 粘结, 金属化率