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题名: Reduction of fine iron ore via a two-step fluidized bed direct reduction process
作者: Zhang, Tao1, 2;  Lei, Chao1, 3;  Zhu, Qingshan1
关键词: Fluidized bed ;  Direct reduction process ;  Fine iron ore ;  Defluidization ;  Carbon precipitation
刊名: POWDER TECHNOLOGY
发表日期: 2014-03-01
DOI: 10.1016/j.powtec.2014.01.004
卷: 254, 页:1-11
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Engineering, Chemical
研究领域[WOS]: Engineering
英文摘要: The industrial application of fluidized bed direct reduction (DR) process for fine iron ore is hampered by the sticking of direct reduction iron (DRI) particles. In the present study, the carbon precipitation reaction is coupled with the reduction reaction of fine iron ore to modify the cohesive force among DRI particles. The competition between the reduction reaction of fine iron ore and the carbon precipitation reaction leads to three types of fluidization behaviors: fluidization, unstable fluidization and defluidization. The carbon precipitation reaction is dominant at the temperature below 600-675 degrees C, and the presence of H-2 could retard the growth of iron whiskers and promote carbon precipitation. A new type of DRI particle covered with carbon shell is therefore constructed and named as DR!, particle. The growth of iron and carbon gasification can destroy the carbon shell, and lead to the increase of stickiness; however, the presence of CO can retard or prevent the destroying. The C/Fe mass ratio on the surface has significant influence on the stickiness and also the fluidization behavior of DRIc particles. The lower limit of C/Fe mass ratio, below which defluidization occurs, increases sharply with increasing temperature. Based on these findings, a two-step fluidized bed DR process for fine iron ore is proposed and proved feasible, and the operating lines of the fluidization zones are indicated as maps. (C) 2014 Elsevier B.V. All rights reserved.
关键词[WOS]: CARBON-MONOXIDE ;  SMELTING-REDUCTION ;  STICKING BEHAVIOR ;  DECOMPOSITION ;  PREVENTION ;  OXIDE ;  DEPOSITION ;  MECHANISM ;  HYDROGEN ;  POWDERS
语种: 英语
WOS记录号: WOS:000333883800001
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/145888
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China
3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

Recommended Citation:
Zhang, Tao,Lei, Chao,Zhu, Qingshan. Reduction of fine iron ore via a two-step fluidized bed direct reduction process[J]. POWDER TECHNOLOGY,2014,254:1-11.
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