Effect of Na2O on the reduction of Fe2O3 compacts with CO/CO2

Wen Pan; Ze Jun Ma; Zhi Xing Zhao; Wan Ho Kim; Dong Joon Min

doi:10.1007/s11663-012-9738-z

Effect of Na₂O on the reduction of Fe₂O₃ compacts with CO/CO₂

Wen Pan, Ze Jun Ma, Zhi Xing Zhao, Wan Ho Kim, Dong Joon Min

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Compacts of Fe₂O₃ and Fe₂O₃ doped with varying amounts of Na₂O were isothermally reduced at several temperatures, using CO/CO₂ mixed gas in a vertical resistance furnace. To determine the effect of Na₂O on the reduction of Fe₂O₃ compacts, the mass loss due to oxygen removal was continuously recorded, from which the reduction rate and rate constant were obtained. Na₂O was found to retard the reduction of Fe₂O₃ compacts. The apparent activation energy (E_a) of reaction and the mathematical relationship for pore gas diffusion suggested that the reduction behavior at the initial stages was controlled by a combination of pore gas diffusion and interfacial chemical reaction. At the intermediate and late stages of reduction, pore gas diffusion was the sole contributing factor. Morphological examination of the reduced compacts showed the formation of a liquid phase during the reduction process, which appeared to lower the rate of reaction.

Original language	English
Pages (from-to)	1326-1337
Number of pages	12
Journal	Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume	43
Issue number	6
DOIs	https://doi.org/10.1007/s11663-012-9738-z
Publication status	Published - 2012 Dec 1

Bibliographical note

Funding Information:
This work was funded by the fourth stage of Brain Korea 21. Special appreciation is warranted to Prof. I. Sohn of Yonsei University for the helpful discussions.

Publisher Copyright:
© The Minerals, Metals & Materials Society and ASM International 2012.

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys
Materials Chemistry

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title = "Effect of Na2O on the reduction of Fe2O3 compacts with CO/CO2",

abstract = "Compacts of Fe2O3 and Fe2O3 doped with varying amounts of Na2O were isothermally reduced at several temperatures, using CO/CO2 mixed gas in a vertical resistance furnace. To determine the effect of Na2O on the reduction of Fe2O3 compacts, the mass loss due to oxygen removal was continuously recorded, from which the reduction rate and rate constant were obtained. Na2O was found to retard the reduction of Fe2O3 compacts. The apparent activation energy (Ea) of reaction and the mathematical relationship for pore gas diffusion suggested that the reduction behavior at the initial stages was controlled by a combination of pore gas diffusion and interfacial chemical reaction. At the intermediate and late stages of reduction, pore gas diffusion was the sole contributing factor. Morphological examination of the reduced compacts showed the formation of a liquid phase during the reduction process, which appeared to lower the rate of reaction.",

author = "Wen Pan and Ma, {Ze Jun} and Zhao, {Zhi Xing} and Kim, {Wan Ho} and Min, {Dong Joon}",

note = "Funding Information: This work was funded by the fourth stage of Brain Korea 21. Special appreciation is warranted to Prof. I. Sohn of Yonsei University for the helpful discussions. Publisher Copyright: {\textcopyright} The Minerals, Metals & Materials Society and ASM International 2012.",

year = "2012",

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doi = "10.1007/s11663-012-9738-z",

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T1 - Effect of Na2O on the reduction of Fe2O3 compacts with CO/CO2

AU - Pan, Wen

AU - Ma, Ze Jun

AU - Zhao, Zhi Xing

AU - Kim, Wan Ho

AU - Min, Dong Joon

N1 - Funding Information: This work was funded by the fourth stage of Brain Korea 21. Special appreciation is warranted to Prof. I. Sohn of Yonsei University for the helpful discussions. Publisher Copyright: © The Minerals, Metals & Materials Society and ASM International 2012.

PY - 2012/12/1

Y1 - 2012/12/1

N2 - Compacts of Fe2O3 and Fe2O3 doped with varying amounts of Na2O were isothermally reduced at several temperatures, using CO/CO2 mixed gas in a vertical resistance furnace. To determine the effect of Na2O on the reduction of Fe2O3 compacts, the mass loss due to oxygen removal was continuously recorded, from which the reduction rate and rate constant were obtained. Na2O was found to retard the reduction of Fe2O3 compacts. The apparent activation energy (Ea) of reaction and the mathematical relationship for pore gas diffusion suggested that the reduction behavior at the initial stages was controlled by a combination of pore gas diffusion and interfacial chemical reaction. At the intermediate and late stages of reduction, pore gas diffusion was the sole contributing factor. Morphological examination of the reduced compacts showed the formation of a liquid phase during the reduction process, which appeared to lower the rate of reaction.

AB - Compacts of Fe2O3 and Fe2O3 doped with varying amounts of Na2O were isothermally reduced at several temperatures, using CO/CO2 mixed gas in a vertical resistance furnace. To determine the effect of Na2O on the reduction of Fe2O3 compacts, the mass loss due to oxygen removal was continuously recorded, from which the reduction rate and rate constant were obtained. Na2O was found to retard the reduction of Fe2O3 compacts. The apparent activation energy (Ea) of reaction and the mathematical relationship for pore gas diffusion suggested that the reduction behavior at the initial stages was controlled by a combination of pore gas diffusion and interfacial chemical reaction. At the intermediate and late stages of reduction, pore gas diffusion was the sole contributing factor. Morphological examination of the reduced compacts showed the formation of a liquid phase during the reduction process, which appeared to lower the rate of reaction.

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