Effect of Coke Particle Arrangement on Reduction and Gasification Reaction in Mixed Layer of Ore and Coke

Kashihara, Yusuke; Iwai, Yuki; Fukada, Kiyoshi; Nogami, Hiroshi

doi:10.2355/isijinternational.isijint-2019-011

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…Therefore, the coupling effect of H-R coke and sintering ore promotes the reduction of sinter. This is similar to the research results of Kashihara et al . Through experiments and mathematical model analysis, they found that the reduction rate of ore and the gasification rate of coke in the mixed layer of ore and coke were accelerated due to the mutual utilization of the gases produced by the reaction.…”

Section: Resultssupporting

confidence: 90%

“…Therefore, the coupling effect of H-R coke and sintering ore promotes the reduction of sinter. This is similar to the research results of Kashihara et al 24 Through experiments and mathematical model analysis, they found that the reduction rate of ore and the gasification rate of coke in the mixed layer of ore and coke were accelerated due to the mutual utilization of the gases produced by the reaction. The peak fitting method was used to distinguish the peaks with the diffraction angle of 18−32°in the XRD spectrum.…”

Section: Resultssupporting

confidence: 90%

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Coupled Typical Coke Gasification and Sintering Ore Reduction in CO–N₂–H₂

Qin

et al. 2022

ACS Omega

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Through thermodynamic calculation and high-temperature simulation experiments, the coupling behavior between gasification of high- and low-reactivity cokes and reduction of sintering ore in CO–N 2 –H 2 mixed gas with 25% H 2 volume fraction was studied, and the evolution of the coke carbon structure and the pore structure was analyzed. The results show that the reaction rate of the two cokes increases with the increase in temperature after the coupling reaction, and the strength after drumming decreases with the increase in temperature. The strength of low-reactivity coke after the reaction is higher than that of high-reactivity coke, and the reduction degree of sintering ore after the coupling reaction with low-reactivity coke is higher than that with high-reactivity coke. At high temperatures and high hydrogen-rich atmospheres with φ(H 2 ) of 25%, the strength of high-reactivity coke after drum rotation is greater than 60.4%. The graphitization degree and carbon structure order of low-reactivity coke are higher than those of high-reactivity coke.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 90%

Coupled Typical Coke Gasification and Sintering Ore Reduction in CO–N₂–H₂

Qin

et al. 2022

ACS Omega

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“…There are several reports on the gasification behavior of coke, especially highly reactive coke. 2,[28][29][30] However, the behavior of ash during the gasification of coke under the simulated conditions for BF is not properly understood. Therefore, in this study, the following three factors are evaluated:…”

Section: Effect Of Silica In Ash Of Coke On Carburization and Melting Of Ironmentioning

confidence: 99%

Effect of Silica in Ash of Coke on Carburization and Melting of Iron

2021

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Reducing energy consumption in ironmaking process is essential for decreasing the amount of carbon dioxide emission from the blast furnace process. To effectively reduce carbon dioxide emission, a faster reduction of iron ore, as well as the acceleration of carburization and melting of the reduced iron is important. Understanding the ash behavior of coke in blast furnace is necessary for controlling carburization because ash prevents carburization. In this study, the following were investigated:1) Condensation behavior of the ash components on the surface of coke by gasification under the simulated blast furnace condition 2) Melting behavior of iron tablet by the direct contact with coke plate 3) In-situ observation of the melting behavior of coke-iron composite and effect of deashing treatment 4) In-situ observation of the melting behavior of Fe-Si alloy using graphite The results revealed that ash condenses on the coke surface via gasification, and the ash coverage ratio of the coke surface increases with increasing in the coke reactivity. In addition, the melting of iron by carburization with coke proceeds at lower temperature when the coke reactivity is high. However, the effect of ash coverage on this behavior is significantly higher than that of coke reactivity, and an increase in the ash coverage ratio suppresses the carburization and melting of iron. In addition, during holding at high temperature, SiO 2 in ash is reduced to Si, and it alloys with metallic iron. Furthermore, an increase in Si concentration in metallic iron increases the melting temperature of Fe-Si system. Consequently, carburization and melting iron are suppressed.

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“…At present, there are many researches on the preparation process, gasification reaction behavior and metallurgical performance optimization of iron coke 5,[20][21][22][23] , but few reports on the effect of iron coke on the reduction of iron-bearing burden (pellet or sinter) in BF. The operation of many blast furnaces has proven that mixing nut coke among iron-bearing burdens can promote the reduction of iron-bearing burdens, reduce coke ratio and improve BF work efficiency [24][25][26][27] . Based on this, mixing iron coke with a high reactivity among iron-bearing burdens is expected to have better results.…”

Section: Introductionmentioning

confidence: 99%

Isothermal Reduction Kinetics of the Mixture of Iron Carbon Agglomerates and Sinter

Bao,

Chu,

Tang

et al. 2024

ISIJ Int.

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The effect of iron carbon agglomerates (ICA) on the reduction of sinter is very important to blast furnace (BF) ironmaking. In this paper, the isothermal reduction kinetics of ICA-sinters mixture and the coupling synergistic mechanism between ICA and sinter are comprehensively studied. The results show that the early stage of isothermal reduction of ICA-sinters mixture is jointly controlled by the interfacial chemical reactions of FeO being reduced to Fe in sinter and gasification reaction in ICA, and the later stage is controlled by the internal diffusion. As the reactivity of ICA improves from 52.81% to 69.71%, the isothermal reduction reaction activation energy of ICA-sinters mixture decreases from 84.22 to 72.58 kJ/mol in early stage and decreases from 110.78 to 97.41 kJ/mol in late stage. Meanwhile, the activation energy of isothermal reduction reaction for the mixture of ICA and sinter with a higher reducibility is lower. There is a coupling synergistic effect between ICA and sinters, and ICA plays a continuous role in circulating CO and transferring oxygen during the reduction of sinter, which can significantly promote the reduction of iron oxides in sinter. The synergistic effect gradually increases with the improvement of the reactivity of ICA and the reducibility of sinter.

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Effect of Coke Particle Arrangement on Reduction and Gasification Reaction in Mixed Layer of Ore and Coke

Cited by 9 publications

References 18 publications

Coupled Typical Coke Gasification and Sintering Ore Reduction in CO–N₂–H₂

Coupled Typical Coke Gasification and Sintering Ore Reduction in CO–N₂–H₂

Effect of Silica in Ash of Coke on Carburization and Melting of Iron

Isothermal Reduction Kinetics of the Mixture of Iron Carbon Agglomerates and Sinter

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Effect of Coke Particle Arrangement on Reduction and Gasification Reaction in Mixed Layer of Ore and Coke

Cited by 9 publications

References 18 publications

Coupled Typical Coke Gasification and Sintering Ore Reduction in CO–N2–H2

Coupled Typical Coke Gasification and Sintering Ore Reduction in CO–N2–H2

Effect of Silica in Ash of Coke on Carburization and Melting of Iron

Isothermal Reduction Kinetics of the Mixture of Iron Carbon Agglomerates and Sinter

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Coupled Typical Coke Gasification and Sintering Ore Reduction in CO–N₂–H₂

Coupled Typical Coke Gasification and Sintering Ore Reduction in CO–N₂–H₂