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Reduction of fine iron ore via a two-step fluidized bed direct reduction process
Alternative TitlePowder Technol.
Zhang, Tao1,2; Lei, Chao1,3; Zhu, Qingshan1
2014-03-01
Source PublicationPOWDER TECHNOLOGY
ISSN0032-5910
Volume254Issue:1Pages:1-11
AbstractThe 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.; 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.
KeywordFluidized Bed Direct Reduction Process Fine Iron Ore Defluidization Carbon Precipitation
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.powtec.2014.01.004
URL查看原文
Indexed BySCI
Language英语
WOS KeywordCARBON-MONOXIDE ; SMELTING-REDUCTION ; STICKING BEHAVIOR ; DECOMPOSITION ; PREVENTION ; OXIDE ; DEPOSITION ; MECHANISM ; HYDROGEN ; POWDERS
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
WOS IDWOS:000333883800001
Citation statistics
Cited Times:30[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/11034
Collection研究所(批量导入)
Affiliation1.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
GB/T 7714
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):1-11.
APA Zhang, Tao,Lei, Chao,&Zhu, Qingshan.(2014).Reduction of fine iron ore via a two-step fluidized bed direct reduction process.POWDER TECHNOLOGY,254(1),1-11.
MLA Zhang, Tao,et al."Reduction of fine iron ore via a two-step fluidized bed direct reduction process".POWDER TECHNOLOGY 254.1(2014):1-11.
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