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The Role of MgO Powder in Preventing Defluidization during Fluidized Bed Reduction of Fine Iron Ores with Different Iron Valences
Du, Zhan1,2; Zhu, Qingshan1; Yang, Yafeng1; Fan, Chuanlin1; Pan, Feng1; Sun, Haoyan1; Xie, Zhaohui1
2016-12-01
发表期刊STEEL RESEARCH INTERNATIONAL
ISSN1611-3683
卷号87期号:12页码:1742-1749
摘要

The role of MgO powder in preventing defluidization during the fluidized bed reduction of fine iron ores with different iron valences is investigated. The inhibiting effect of MgO powder on different types of fine iron ores is the same at 973 K, whereas it is sequenced as FeO> Fe3O4> Fe2O3 at 1073 and 1173 K. Specific diffusion couples are employed to clarify the valence-dependent inhibiting mechanism. Electron probe microanalysis, X-ray diffraction results, and the estimation of diffusion activation energy indicate that the inhibiting effect of MgO powder on defluidization is mainly caused by the physical barrier effect for all iron oxides below 1073 K, while the defluidization prevention of Fe3O4 and FeO at 1173 K is mainly attributed to the formation of Fe2MgO4 and MgO . FeO compounds on the surface, respectively. As a result, the required MgO content to prevent defluidization is sequenced as m(Fe2O3)> m(Fe3O4)> m(FeO) at 1173 K. Consequently, the MgO addition at the FeO stage will be more effective in preventing defluidization than the addition at Fe2O3 and Fe3O4 stages during multi- stage fluidized bed reduction of fine iron ores.

关键词Fluidized Bed Reduction Diffusion Couples Inhibiting Effect Mgo Powder Iron Oxides With Different Iron Valences
文章类型Article
WOS标题词Science & Technology ; Technology
DOI10.1002/srin.201600122
收录类别SCI
语种英语
关键词[WOS]SYSTEM ; INTERDIFFUSION ; TEMPERATURES ; BEHAVIOR
WOS研究方向Metallurgy & Metallurgical Engineering
WOS类目Metallurgy & Metallurgical Engineering
项目资助者National Outstanding Youth Science Fund Project of NSFC(21325628) ; National Natural Science Foundation of China(51404228)
WOS记录号WOS:000392632900019
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/21886
专题多相复杂系统国家重点实验室
作者单位1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714
Du, Zhan,Zhu, Qingshan,Yang, Yafeng,et al. The Role of MgO Powder in Preventing Defluidization during Fluidized Bed Reduction of Fine Iron Ores with Different Iron Valences[J]. STEEL RESEARCH INTERNATIONAL,2016,87(12):1742-1749.
APA Du, Zhan.,Zhu, Qingshan.,Yang, Yafeng.,Fan, Chuanlin.,Pan, Feng.,...&Xie, Zhaohui.(2016).The Role of MgO Powder in Preventing Defluidization during Fluidized Bed Reduction of Fine Iron Ores with Different Iron Valences.STEEL RESEARCH INTERNATIONAL,87(12),1742-1749.
MLA Du, Zhan,et al."The Role of MgO Powder in Preventing Defluidization during Fluidized Bed Reduction of Fine Iron Ores with Different Iron Valences".STEEL RESEARCH INTERNATIONAL 87.12(2016):1742-1749.
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