Agglomeration/defluidization in a fluidized bed reduction of Fe2O3 particles by CO: Influences of iron precipitation on particle cohesiveness

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	Agglomeration/defluidization in a fluidized bed reduction of Fe2O3 particles by CO: Influences of iron precipitation on particle cohesiveness
	Zhong, Yiwei 1,2; Wang, Zhi 1; Guo, Zhancheng 3; Tang, Qing 1
刊名	POWDER TECHNOLOGY
	2014-04-01
卷号	256 期号:1 页码:13-19
关键词	Fluidized-bed reduction Fe2O3 Agglomeration Defluidization Iron precipitation Particle cohesiveness
ISSN号	0032-5910
其他题名	Powder Technol.
中文摘要	Influences of iron precipitation on particle cohesiveness related to agglomeration and defluidization in Fe2O3 reduction were investigated in a visual fluidized bed reactor. A new method of the controlled defluidization tests was employed to examine the evolution of bed agglomeration. The real-time agglomeration tendency was represented by the defluidization temperature. Results showed that defluidization potential increased by increasing metallization degree. According to thermo-mechanical analysis, the precipitation of metallic iron significantly reduced the sintering temperature and surface viscosity of Fe2O3 particles, resulting in the evolution of the bed materials from cohesiveless to sticky. The SEM analysis showed that fine iron nuclei with nano/micro size on the surface acted as necks to form agglomerates by sintering and enhanced particle cohesiveness. Thus, the metallized bed particles tended to adhere and resulted in bed defluidization. The calculated adhesive force between particles depended on both metallic iron content and surface viscosity, which was in good agreement with the experiment results for defluidization. (C) 2014 Elsevier B.V. All rights reserved.
英文摘要	Influences of iron precipitation on particle cohesiveness related to agglomeration and defluidization in Fe2O3 reduction were investigated in a visual fluidized bed reactor. A new method of the controlled defluidization tests was employed to examine the evolution of bed agglomeration. The real-time agglomeration tendency was represented by the defluidization temperature. Results showed that defluidization potential increased by increasing metallization degree. According to thermo-mechanical analysis, the precipitation of metallic iron significantly reduced the sintering temperature and surface viscosity of Fe2O3 particles, resulting in the evolution of the bed materials from cohesiveless to sticky. The SEM analysis showed that fine iron nuclei with nano/micro size on the surface acted as necks to form agglomerates by sintering and enhanced particle cohesiveness. Thus, the metallized bed particles tended to adhere and resulted in bed defluidization. The calculated adhesive force between particles depended on both metallic iron content and surface viscosity, which was in good agreement with the experiment results for defluidization. (C) 2014 Elsevier B.V. All rights reserved.
WOS标题词	Science & Technology ; Technology
类目[WOS]	Engineering, Chemical
研究领域[WOS]	Engineering
关键词[WOS]	GAS FLUIDIZATION ; HIGH-TEMPERATURE ; AGGLOMERATION ; DEFLUIDIZATION ; STICKING ; VELOCITY ; MECHANISMS ; DIFFUSION ; BEHAVIOR
收录类别	SCI
原文出处	://WOS:000335097600003
语种	英语
WOS记录号	WOS:000335097600003
公开日期	2014-08-28
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ipe.ac.cn/handle/122111/11058]
专题	过程工程研究所_研究所（批量导入）
作者单位	1.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China 3.Univ Sci & Technol Beijing, Key Lab Ecol & Recycle Met, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Zhong, Yiwei,Wang, Zhi,Guo, Zhancheng,et al. Agglomeration/defluidization in a fluidized bed reduction of Fe2O3 particles by CO: Influences of iron precipitation on particle cohesiveness[J]. POWDER TECHNOLOGY,2014,256(1):13-19.
APA	Zhong, Yiwei,Wang, Zhi,Guo, Zhancheng,&Tang, Qing.(2014).Agglomeration/defluidization in a fluidized bed reduction of Fe2O3 particles by CO: Influences of iron precipitation on particle cohesiveness.POWDER TECHNOLOGY,256(1),13-19.
MLA	Zhong, Yiwei,et al."Agglomeration/defluidization in a fluidized bed reduction of Fe2O3 particles by CO: Influences of iron precipitation on particle cohesiveness".POWDER TECHNOLOGY 256.1(2014):13-19.