Effect of Mineral Composition and Pore Structure on Reducibility of Composite Iron Ore Sinter

Ono, Hideki; Dohi, Yusuke; Arikata, Yuki; Usui, Tateo

doi:10.2355/isijinternational.49.722

Cited by 13 publications

(13 citation statements)

References 4 publications

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“…During roasting of limonite, the crystallization water will decompose, making the specific surface area of pellets larger after roasting. 16) Due to the larger specific surface area of iron ore, the reduction rate is increased, 17) so the reduction rate of limonite is higher than other ores.…”

Section: Preparation Of Pure Limonite Pelletsmentioning

confidence: 99%

Reduction Characteristics of Pure Gale Limonite Pellets in Gaseous Environments

et al. 2020

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In this study, the isothermal reduction mechanism of limonite, an important iron ore resource, in H 2 , CO, and a mixed atmosphere of both gases was studied as a function of reduction temperature and gas composition. The kinetics of the reduction process were studied using a shrinking kernel model. The experimental results show that the degree of reduction of the oxidized pellet particles increases with increases in both reduction time and temperature. Also, it has been found that an increase in the ratio of H 2 /(H 2 + CO) and an increase in temperature result in shortened reduction times. During the reduction process, the kinetic studies show that the early stage of the gas reduction process is controlled by the interfacial chemical reaction and later stages are controlled by diffusion. SEM results show that the particles reduced in the H 2 atmosphere have many micropores. Providing a gas passage during the reduction process reduces the gas diffusion resistance and promotes the diffusion reaction.

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Section: Preparation Of Pure Limonite Pelletsmentioning

confidence: 99%

Reduction Characteristics of Pure Gale Limonite Pellets in Gaseous Environments

et al. 2020

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“…The research on the properties of raw materials, especially the characteristics of iron ores is fundamental and important. In addition to the traditional room temperature characteristics of iron ores, generally including physical structure (Ono et al, 2009;Formoso et al, 2003;Ellis et al, 2007), chemical composition (Hsieh, 2005;Wu et al, 2011;Zhang et al, 2014), and basic sintering characteristics (BSCs) of iron ores proposed by Wu et al (2002a) get more and more attention of the researchers. BSCs including 4 kinds of high temperature characteristics of iron ores, such as assimilation characteristic, liquid phase fluidity characteristic, self-strength of bonding phase, and crystal intensity characteristic, could reflect the behavior and exhibit some physical and chemical characteristic of iron ores in the sintering process.…”

Section: Introductionmentioning

confidence: 98%

Vanadium–titanium magnetite ore blend optimization for sinter strength based on iron ore basic sintering characteristics

Zhou

Jiang

Yang

et al. 2015

International Journal of Mineral Processing

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“…It eventually results in a decrease of the strength of sintered ores because many large cracks are formed during sintering. 1,2) In steelmaking process, refractory lining of a ladle has to be dried and preheated to prevent thermal shock before pouring molten steel. This operation is daily work and usually conducted by burner flames.…”

Section: Introductionmentioning

confidence: 99%

“…Youichi SAITO, 1) Keita KAWAHIRA, 2) Noboru YOSHIKAWA, 2) Hidekazu TODOROKI 3) and Shoji TANIGUCHI 2) 1) Nippon Yakin Kogyo Co., Ltd., Technical Research Center, formerly Student, Tohoku University, 6-6-02, Aza-Aoba, Aramaki, Aoba-ku, Sendai, 980-8579 Japan.…”

mentioning

confidence: 99%

Dehydration Behavior of Goethite Blended with Graphite by Microwave Heating

et al. 2011

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In ironmaking and steelmaking processes, dehydration of wet substances and minerals combined by H2O are often recognized to be a key to stable practices. This study aims at understanding dehydration behavior of goethite blended with graphite by microwave treatment simulating drying wet sludge and poor iron ore with combined water.Firstly blend specimens with various conditions, powdery or pelletized, were heated by microwave apparatus. Dehydration rate of goethite increased with increasing temperature. Denser specimen of pelletized was confirmed to be less effective to heat up the whole part. It was found that surplus addition of graphite decreased efficiency in dehydration rate. Thus, it was estimated that a specimen with smaller amount of graphite, whose blend ratio of FeO(OH):C was 1:1, had sufficiently larger distance between graphite particles, through which microwaves could adequately penetrate into the core of the specimen. To prove this hypothesis, Network Analyzer helped evaluate penetration depth of microwave by the measurement of permittivity. The measured results showed that penetration depth decreased with increasing apparent density consistently with the heating behavior by microwave treatment. At the blend ratio of 1:2 of FeO(OH):C, however, the specimen was estimated to behave as if it was under percolation.

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Effect of Mineral Composition and Pore Structure on Reducibility of Composite Iron Ore Sinter

Cited by 13 publications

References 4 publications

Reduction Characteristics of Pure Gale Limonite Pellets in Gaseous Environments

Reduction Characteristics of Pure Gale Limonite Pellets in Gaseous Environments

Vanadium–titanium magnetite ore blend optimization for sinter strength based on iron ore basic sintering characteristics

Dehydration Behavior of Goethite Blended with Graphite by Microwave Heating

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