Kinetics of Iron Carbide Formation from Reduced Iron Ore in CO-H&lt;SUB&gt;2&lt;/SUB&gt;-H&lt;SUB&gt;2&lt;/SUB&gt;S Mixtures

Hori-I, Kazuyoshi; Iguchi, Yoshiaki; Hayashi, Shoji; Moriya, Tetsuo

doi:10.2355/tetsutohagane1955.89.10_1011

Cited by 4 publications

(6 citation statements)

References 6 publications

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“…In the figure, no explicit tendency for the flow rate to affect the carburization rate is observed. In our previous study, 17) the rate of carbide formation from completely reduced limonite ore was not influ- Fig. 3.…”

Section: Influence Of Flow Rate Of Reaction Gas On Thementioning

confidence: 99%

“…In our previous studies [8][9][10][14][15][16][17][18] conducted at the atmo spheric pressure, the rate of iron carbide formation in CO-H 2 -H 2 S mixtures showed the maximum rate around the composition of 80%CO-H 2 -H 2 S mixture at 973 K. From the results, it was suggested that the carburization reaction strongly depends on the composition of the carburization gas, and the reaction (5), not the reaction (6), may be the main carburization reaction in CO-H 2 -H 2 S mixtures. In pressurized conditions in this study, the influence of the composition of CO-H 2 -H 2 S mixtures with sulfur activity 0.5 at total pressures 0.1, 0.2, 0.4 and 0.6 MPa at 873 and 923 K is shown in Figs.…”

Section: Influence Of Composition Of Co-h 2 -H 2 S Mixtures On the Ramentioning

confidence: 99%

“…2) Since then, several fundamental studies [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] concerning its production from iron ore have actively been performed. However, iron carbides are thermodynamically meta-stable and can not be formed until the carbon activity of the reaction gas increases beyond unity, where free carbon can easily precipitate.…”

Section: Introductionmentioning

confidence: 99%

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Rate of Iron Carbide Formation from Reduced Iron in CO-H2-H2S Mixtures under Pressurized Conditions

et al. 2004

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Under pressurized conditions up to 0.6 MPa, the rate of the iron carbide formation from completely reduced iron in CO-H 2 -H 2 S mixtures was measured by gravimetric technique. The fractional conversion for carbide formation, f q , was defined as the weight gain divided by the weight of carbon for the complete conversion to cementite. First, the compositions of the partially reacted samples were analyzed by Mössbauer absorption spectroscopy. Then, the fractional conversion calculated from the composition, f q M , was compared with f q . The value of f q agreed reasonably with that of f q M in the range f q Ͻ0.8, from which the gravimetric method is proved to be valid to the measurements for the rate of iron carbide formation. The carbide formation curves, f q versus t relation, were not influenced by the weight of the sample and the flow rate of the reaction gas in the conditions; 50 mg, more than 3.33ϫ10 Ϫ6 m 3 /s. Cross sectional view indicated the homogeneous distribution of cementite regions in the reduced iron particles partially converted to cementite. On the other hand, the rate was very sensitive to the conditions of the carburization reaction on the pore surface. The rate increased with increasing the content of carbon monoxide up to 80 to 90 %, where the rate was the maximum, and then gradually decreased with further increasing the content. The rate increased with the total pressure, but decreased with the activity of sulfur. The rate controlling step of the iron carbide formation was discussed on the basis of the experimental results. The rate controlling step was assumed to be the carburization reactions on the pore surface of reduced iron particles.

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Section: Influence Of Flow Rate Of Reaction Gas On Thementioning

confidence: 99%

Section: Influence Of Composition Of Co-h 2 -H 2 S Mixtures On the Ramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rate of Iron Carbide Formation from Reduced Iron in CO-H2-H2S Mixtures under Pressurized Conditions

et al. 2004

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“…Considering it, the simulation by Eqs. (16), (18) and (19) can be used for the simulation of cementite formation from completely reduced iron.…”

Section: Derivation Of Carburization Rate Equation Andmentioning

confidence: 99%

“…1) Since then, fundamental studies [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] concerning iron carbide production from iron ore have been actively performed. Since iron carbides are thermodynamically meta-stable, however, it is not formed until the carbon activity of the reaction gas is increased beyond unity.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Cementite Formation from Reduced Iron in CO-H2-H2S Mixtures under Pressurized Conditions

2004

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Evolution of deposited carbon during multi-stage fluidized-bed reduction of iron ore fines

Zhu

Pan

et al. 2018

Particuology

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Kinetics of Iron Carbide Formation from Reduced Iron Ore in CO-H<SUB>2</SUB>-H<SUB>2</SUB>S Mixtures

Cited by 4 publications

References 6 publications

Rate of Iron Carbide Formation from Reduced Iron in CO-H2-H2S Mixtures under Pressurized Conditions

Rate of Iron Carbide Formation from Reduced Iron in CO-H2-H2S Mixtures under Pressurized Conditions

Kinetics of Cementite Formation from Reduced Iron in CO-H2-H2S Mixtures under Pressurized Conditions

Evolution of deposited carbon during multi-stage fluidized-bed reduction of iron ore fines

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