Effect of FeO concentration in sinter iron ore on reduction behavior in a hydrogen-enriched blast furnace

作     者：Ko-ichiro Ohno Takayuki Maeda Kazuya Kunitomo Masashi Hara Ko-ichiro Ohno;Takayuki Maeda;Kazuya Kunitomo;Masashi Hara

作者机构：Department of MaterialsFaculty of EngineeringKyushu University744 MotookaNishi-kuFukuoka 819-0395Japan Kashima AreaEast Nippon WorksNippon Steel Corporation3 HikariKashima CityIbaraki 314-0014Japan 

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：1820-1829页

核心收录：

学科分类：080602[工学-钢铁冶金] 08[工学] 0806[工学-冶金工程] 

基　　金：based on results obtained from the“CO_(2)Ultimate Reduction System for Cool Earth 50(COURSE50)Project”commissioned by the New Energy and Industrial Technology Development Organization(NEDO) 

主　　题：hydrogen reduction wustite hematite magnetite calcium ferrite two-interface unreacted core model COURSE50 

摘      要：Japan started the national project“COURSE 50for CO_(2) reduction in the *** project aimed to establish novel technologies to reduce CO_(2) emissions with partially utilization of hydrogen in blast furnace-based ironmaking by 30%by around 2030 and use it for practical applications by *** idea is that instead of coke,hydrogen is used as the reducing agent,leading to lower fossil fuel consumption in the *** has been reported that the reduction behavior of hematite,magnetite,calcium ferrite,and slag in the sinter is different,and it is also considerably influenced by the sinter *** study aimed to investigate the reduction behavior of sinters in hydrogen enriched blast furnace with different mineral morphologies in CO-CO_(2)-H2 mixed *** an experimental sample,two sinter samples with significantly different hematite and magnetite ratios were prepared to compare their reduction *** reduction of wustite to iron was carried out at 1000,900,and 800℃ in a CO-CO_(2)-H2 atmosphere for the mineral morphology-controlled sinter,and the following findings were *** reduction rate of smaller amount of FeO led to faster increase of the reduction rate curve at the initial stage of ***-observations of reduced samples showed that the reaction proceeded from the outer periphery of the sample toward the inside,and a reaction interface was observed where reduced iron and wustite ***-observations revealed three layers,namely,wustite single phase in the center zone of the sample,iron single phase in the outer periphery zone of the sample,and iron oxide-derived wustite FeO and iron,or calcium ferritederived wustite FeO and iron in the reaction interface zone.A two-interface unreacted core model was successfully applied for the kinetic analysis of the reduction reaction,and obtained temperature dependent expressions of the chemical reaction coefficients from each mineral phases.