Kinetic analysis of spherical wüstite reduction transported with CH 4 gas

Naoyuki Takeuchi, Yohei Nomura, Ko-Ichiro Ohno, Takayuki Maeda, Koki Nishioka, Masakata Shimizu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Rapid in-flight reduction of fine iron ore transported with CO, H 2 and/or CH 4 gas has been studied for direct use of fine iron ore in iron-making process. In this work, the mechanism and the kinetic of the reduction by CH 4 gas were accurately investigated with spherical wustite fine particles. The spherical wüstite fine particle as fine iron ore was prepared to simplify the reduction rate analysis. Reduction temperature was varied from 1373 to 1573K. As the result, fractional reduction of spherical wüstite by CH 4 gas reached over 80% at 1573K within 1 sec. From the cross section observation of the particle after reduction, it was found that the periphery of the wustite particle was metallized by reducing reaction and un-reacted wüstite core remained inside. Therefore, it was indicated that the reduction progressed topochemically in this experimental condition. In the reduction rate analysis, it was found out that the reduction rate by CH 4 was higher than that by H 2 or CO. From the carbon concentration analysis, it was found that the phase of the metallic shell during reduction was not only solid state but also liquid state. From the above-mentioned kinetic analysis, it was concluded that the reduction rate determining-step by CH 4 was chemical reaction on Fe-FeO interface and the reduction of wüstite was preceded by the carbon dissolved into metallic shell from CH 4 gas.

Original languageEnglish
Pages (from-to)115-120
Number of pages6
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume94
Issue number4
DOIs
Publication statusPublished - Dec 1 2008

Fingerprint

Gases
methylidyne
Kinetics
kinetics
gases
iron ores
Iron ores
Carbon Monoxide
Carbon
carbon
Chemical reactions
chemical reactions
Iron
flight
solid state
iron
cross sections
Liquids
liquids

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

Cite this

Kinetic analysis of spherical wüstite reduction transported with CH 4 gas . / Takeuchi, Naoyuki; Nomura, Yohei; Ohno, Ko-Ichiro; Maeda, Takayuki; Nishioka, Koki; Shimizu, Masakata.

In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, Vol. 94, No. 4, 01.12.2008, p. 115-120.

Research output: Contribution to journalArticle

@article{58375bf4457e48fe8de1f199e48df8ae,
title = "Kinetic analysis of spherical w{\"u}stite reduction transported with CH 4 gas",
abstract = "Rapid in-flight reduction of fine iron ore transported with CO, H 2 and/or CH 4 gas has been studied for direct use of fine iron ore in iron-making process. In this work, the mechanism and the kinetic of the reduction by CH 4 gas were accurately investigated with spherical wustite fine particles. The spherical w{\"u}stite fine particle as fine iron ore was prepared to simplify the reduction rate analysis. Reduction temperature was varied from 1373 to 1573K. As the result, fractional reduction of spherical w{\"u}stite by CH 4 gas reached over 80{\%} at 1573K within 1 sec. From the cross section observation of the particle after reduction, it was found that the periphery of the wustite particle was metallized by reducing reaction and un-reacted w{\"u}stite core remained inside. Therefore, it was indicated that the reduction progressed topochemically in this experimental condition. In the reduction rate analysis, it was found out that the reduction rate by CH 4 was higher than that by H 2 or CO. From the carbon concentration analysis, it was found that the phase of the metallic shell during reduction was not only solid state but also liquid state. From the above-mentioned kinetic analysis, it was concluded that the reduction rate determining-step by CH 4 was chemical reaction on Fe-FeO interface and the reduction of w{\"u}stite was preceded by the carbon dissolved into metallic shell from CH 4 gas.",
author = "Naoyuki Takeuchi and Yohei Nomura and Ko-Ichiro Ohno and Takayuki Maeda and Koki Nishioka and Masakata Shimizu",
year = "2008",
month = "12",
day = "1",
doi = "10.2355/tetsutohagane.94.115",
language = "English",
volume = "94",
pages = "115--120",
journal = "Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan",
issn = "0021-1575",
publisher = "一般社団法人 日本鉄鋼協会",
number = "4",

}

TY - JOUR

T1 - Kinetic analysis of spherical wüstite reduction transported with CH 4 gas

AU - Takeuchi, Naoyuki

AU - Nomura, Yohei

AU - Ohno, Ko-Ichiro

AU - Maeda, Takayuki

AU - Nishioka, Koki

AU - Shimizu, Masakata

PY - 2008/12/1

Y1 - 2008/12/1

N2 - Rapid in-flight reduction of fine iron ore transported with CO, H 2 and/or CH 4 gas has been studied for direct use of fine iron ore in iron-making process. In this work, the mechanism and the kinetic of the reduction by CH 4 gas were accurately investigated with spherical wustite fine particles. The spherical wüstite fine particle as fine iron ore was prepared to simplify the reduction rate analysis. Reduction temperature was varied from 1373 to 1573K. As the result, fractional reduction of spherical wüstite by CH 4 gas reached over 80% at 1573K within 1 sec. From the cross section observation of the particle after reduction, it was found that the periphery of the wustite particle was metallized by reducing reaction and un-reacted wüstite core remained inside. Therefore, it was indicated that the reduction progressed topochemically in this experimental condition. In the reduction rate analysis, it was found out that the reduction rate by CH 4 was higher than that by H 2 or CO. From the carbon concentration analysis, it was found that the phase of the metallic shell during reduction was not only solid state but also liquid state. From the above-mentioned kinetic analysis, it was concluded that the reduction rate determining-step by CH 4 was chemical reaction on Fe-FeO interface and the reduction of wüstite was preceded by the carbon dissolved into metallic shell from CH 4 gas.

AB - Rapid in-flight reduction of fine iron ore transported with CO, H 2 and/or CH 4 gas has been studied for direct use of fine iron ore in iron-making process. In this work, the mechanism and the kinetic of the reduction by CH 4 gas were accurately investigated with spherical wustite fine particles. The spherical wüstite fine particle as fine iron ore was prepared to simplify the reduction rate analysis. Reduction temperature was varied from 1373 to 1573K. As the result, fractional reduction of spherical wüstite by CH 4 gas reached over 80% at 1573K within 1 sec. From the cross section observation of the particle after reduction, it was found that the periphery of the wustite particle was metallized by reducing reaction and un-reacted wüstite core remained inside. Therefore, it was indicated that the reduction progressed topochemically in this experimental condition. In the reduction rate analysis, it was found out that the reduction rate by CH 4 was higher than that by H 2 or CO. From the carbon concentration analysis, it was found that the phase of the metallic shell during reduction was not only solid state but also liquid state. From the above-mentioned kinetic analysis, it was concluded that the reduction rate determining-step by CH 4 was chemical reaction on Fe-FeO interface and the reduction of wüstite was preceded by the carbon dissolved into metallic shell from CH 4 gas.

UR - http://www.scopus.com/inward/record.url?scp=77952331682&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77952331682&partnerID=8YFLogxK

U2 - 10.2355/tetsutohagane.94.115

DO - 10.2355/tetsutohagane.94.115

M3 - Article

VL - 94

SP - 115

EP - 120

JO - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan

JF - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan

SN - 0021-1575

IS - 4

ER -