Effect of Reducing Gas on the Volume Change during Reduction of Iron Oxide Compacts.

El-Geassy, A. A.; Nasr, M. I.; Hessien, M.M.

doi:10.2355/isijinternational.36.640

Cited by 69 publications

(35 citation statements)

References 4 publications

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Sharma et al 17) observed that the swelling index increased with an increase in the porosity of the pellets fired at various temperatures and for different times. The pellets were fired in the temperature range of 1 000-1 350°C and soaked for different time intervals ranging from 10 to 80 min.…”

Section: Introductionmentioning

confidence: 99%

Effects of Firing and Reduction Conditions on Swelling and Iron Whisker Formation during the Reduction of Iron Oxide Compact

Wang

Sohn

2011

ISIJ International

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The effects of firing and reduction conditions on swelling and iron whisker growth were investigated. The iron oxide compacts sintered in air were reduced in the tubular high temperature reactor by carbon monoxide or hydrogen. The experimental results showed that catastrophic swelling was suppresed by increasing the firing temperature or the firing time at moderate firing temperatures. The severest swelling happened in the reduction temperature of 900-1 000°C with carbon monoxide. No catastrophic swelling was observed when hydrogen was used as the reducing gas. The SEM micrographs showed that catastrophic swelling was caused by a large amount of long whiskers formed during the reduction. The number of nucleation sites of whisker growth was limited when the firing temperature was increased above 1 000°C, which also suppressed catastrophic swelling. On the basis of exprimental data and SEM results, a conceptual diagram was formulated to describe the effects of firing and reduction conditions on iron whisker growth and swelling.

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Section: Introductionmentioning

confidence: 99%

Effects of Firing and Reduction Conditions on Swelling and Iron Whisker Formation during the Reduction of Iron Oxide Compact

Wang

Sohn

2011

ISIJ International

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“…At high reduction temperature (Ͼ900°C), the swelling is less because of low C deposition and greater sintering. 5,6) In this paper the effect of various reducing conditions on the swelling of cement-bonded briquettes have been discussed.…”

Section: Introductionmentioning

confidence: 99%

Effect of Reduction Conditions on the Swelling Behaviour of Cement-bonded Briquettes

Singh

Björkman

2004

ISIJ International

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Cement-bonded agglomerates of by-products generated in iron and steel plants are commonly used as burden material for blast furnaces. It has been observed that under certain conditions the briquettes containing pellet-fines show a tendency to swell catastrophically when reduced at 900-1 000°C using carbon monoxide as reducing agent. This swelling is dependent upon a number of factors like: reducing temperature, reducing conditions and composition of reducing gas. The optical micrographs do not show the formation of iron whiskers as the cause of swelling; instead, the reduced iron particles seem to move apart, thereby causing swelling. This paper describes the effect of various parameters that cause the abnormal swelling of briquettes.

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“…[9][10][11] Reduction process of iron oxides by hydrogen has been widely investigated by numerous researchers. [12][13][14][15][16][17][18][19] EL-GEASS et al 12) found that reduction rate of iron oxide compacts was greater for H 2 reduction and lower for CO reduction, while using gas mixtures showed intermediate rate values with 50%CO-H 2 reduction faster than that of reformed natural gas. Costa et al 13) studied reduction of iron ore by pure hydrogen using small haematite cubes shaped from industrial pellets.…”

Section: Introductionmentioning

confidence: 99%

Reduction Behavior and Kinetics of Iron Ore Pellets under H<sub>2</sub>–N<sub>2</sub> Atmosphere

Bai

Ren

et al. 2018

ISIJ International

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Effect of Reducing Gas on the Volume Change during Reduction of Iron Oxide Compacts.

Abstract: The mechanism that most likely controlled the process COgas mixture). On the other hand, the swelling of (Fig. 5b)

Cited by 69 publications

References 4 publications

Effects of Firing and Reduction Conditions on Swelling and Iron Whisker Formation during the Reduction of Iron Oxide Compact

Effects of Firing and Reduction Conditions on Swelling and Iron Whisker Formation during the Reduction of Iron Oxide Compact

Effect of Reduction Conditions on the Swelling Behaviour of Cement-bonded Briquettes

Reduction Behavior and Kinetics of Iron Ore Pellets under H<sub>2</sub>–N<sub>2</sub> Atmosphere

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