Hydrogen-based direct reduction of iron oxide at 700℃:Heterogeneity at pellet and microstructure scales

作     者：Yan Ma Isnaldi R.Souza Filho Xue Zhang Supriya Nandy Pere Barriobero-Vila Guillermo Requena Dirk Vogel Michael Rohwerder Dirk Ponge Hauke Springer Dierk Raabe Yan Ma;Isnaldi R.Souza Filho;Xue Zhang;Supriya Nandy;Pere Barriobero-Vila;Guillermo Requena;Dirk Vogel;Michael Rohwerder;Dirk Ponge;Hauke Springer;Dierk Raabe

作者机构：Max-Planck-Institut für EisenforschungMax-Planck-Straße 140237 DüsseldorfGermany Corrosion CenterInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China Institute of Materials ResearchGerman Aerospace Center(DLR)Linder Höhe51147 CologneGermany Lehr-und Forschungsgebiet Metallische Strukturen und Werkstoffsysteme für die Luft-und RaumfahrtRWTH Aachen University52062 AachenGermany Institut für Bildsame FormgebungRWTH Aachen UniversityIntzestraße 1052072 AachenGermany 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2022年第29卷第10期

页      面：1901-1907页

核心收录：

学科分类：08[工学] 0806[工学-冶金工程] 080601[工学-冶金物理化学] 

基　　金：financial support from the Walter Benjamin Programme of the Deutsche Forschungsgemeinschaft(No.468209039) the financial support from Capes-Humboldt(No.88881.512949/2020-01) the financial support from the Heisenberg Programme of the Deutsche Forschungsgemeinschaft(SP16662/1) 

主　　题：hydrogen-based direct reduction iron oxide microstructure spatial gradient metallization 

摘      要：Steel production causes a third of all industrial CO_(2) emissions due to the use of carbon-based substances as reductants for iron ores,making it a key driver of global ***,research efforts aim to replace these reductants with sustainably produced ***-based direct reduction(HyDR)is an attractive processing technology,given that direct reduction(DR)furnaces are routinely operated in the steel industry but with CH_(4) or CO as *** diffuses considerably faster through shaft-furnace pellet agglomerates than carbon-based ***,the net reduction kinetics in HyDR remains extremely sluggish for high-quantity steel production,and the hydrogen consumption exceeds the stoichiometrically required amount ***,the present study focused on the improved understanding of the influence of spatial gradients,morphology,and internal microstructures of ore pellets on reduction efficiency and metallization during *** this purpose,commercial DR pellets were investigated using synchrotron high-energy X-ray diffraction and electron microscopy in conjunction with electron backscatter diffraction and chemical *** the interplay of different phases with internal interfaces,free surfaces,and associated nucleation and growth mechanisms provides a basis for developing tailored ore pellets that are highly suited for a fast and efficient HyDR.