Reduction Kinetics and Catastrophic Swelling of MnO2-doped Fe2O3 Compacts with CO at 1073-1373 K

El-Geassy, A. A.; Nasr, M. I.; Omar, Adel A.; Mousa, Elsayed

doi:10.2355/isijinternational.47.377

Cited by 27 publications

(20 citation statements)

References 12 publications

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“…Reduction swelling of iron oxide pellets or compacts has been studied by a number of investigators 1–26. The formation and growth of fibrous iron whiskers during the reduction of wustite to iron has been determined to be the major cause for catastrophic swelling.…”

Section: Introductionmentioning

confidence: 99%

Effects of Reducing Gas on Swelling and Iron Whisker Formation during the Reduction of Iron Oxide Compact

Wang

Sohn

2012

steel research int.

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The effects of different types of reducing gas on swelling and iron whisker formation during the reduction of iron oxide compacts were investigated. The compacts sintered in air at 1273 K were reduced at 1173 K in different reducing atmospheres. The results indicated that catastrophic swelling can happen in CO but not when H 2 is present in the reducing gas mixture. Scanning electron microscope (SEM) micrographs showed that catastrophic swelling was caused by a large amount of long iron whiskers formed during the reduction. The presence of N 2 and CO 2 in CO changed the amount of long iron whiskers and its distribution, which determined the extent of swelling.

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Section: Introductionmentioning

confidence: 99%

Effects of Reducing Gas on Swelling and Iron Whisker Formation during the Reduction of Iron Oxide Compact

Wang

Sohn

2012

steel research int.

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“…Xi) Carbon dioxide diffuses to the bulk gas phase. Generally, the chemical reaction at the reacted interface or gas diffusion in the product layer is the controlling step, 31,32) and this mainly depends on the substance, reaction, reaction temperature, particle size and even gas concentration. Taking particle size as an example, the particle size can influence the reduction mechanism.…”

Section: Reduction Mechanism Of Metal Oxides By Comentioning

confidence: 99%

A Model for the Reduction of Metal Oxides by Carbon Monoxide

Dang

Chou

2018

ISIJ International

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The reduction of metal oxides by carbon monoxide is a very significant reaction in metallurgical and chemical industries. In current study, a kinetic model describing the reduction reaction of metal oxides by CO has been developed. The model is in the analytic function of parameters such as temperature, radius of the particle, CO content, density of metal oxides and time, which is, therefore, convenient for usage and theoretical analysis. The developed model can be applied to describe the reduction kinetics of metal oxides under both isothermal and non-isothermal conditions. Particularly, it can be used to describe the kinetics of both single reduction reaction (single reaction interface) and dual reduction reactions (double reaction interfaces, such as, the reduction of Fe 2 O 3 to FeO with Fe 3 O 4 being the intermediate product) as well. Application of the developed model to practical systems validated that its predicted values agreed very well with the experimental data in literatures.

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“…(a) SiO 2 (2.5, 5.0 and 7.5 mass%), (b) MnO 2 (6 % mass%), 18) (c) 6%MnO 2 ϩ7.5%SiO 2 . In order to ensure complete homogeneity of mixed powders, each of these samples was milled for 8 h in a ball mill at 100 rpm.…”

Section: Materials and Experimental Techniquementioning

confidence: 99%

“…[14][15][16][17] In previous work, 18) the influence of MnO 2 (2.0-6.0 mass%) on the reduction behaviour and the volume change was intensively studied. The present work is focused on the influence of either SiO 2 (2.5-7.5 mass%) and/or MnO 2 (6.0 mass%) on isothermal reduction behaviour, volume changes and the morphology of iron oxide compacts in CO atmosphere at 1 073-1 373 K. The reduction kinetics obtained was correlated with microstructure to predict the reduction mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that impurities and associated gangue minerals play an important role on the reduction of iron oxides by its affect the swelling of pellets. [8][9][10] 2 ) compacts annealed at 1 473 K for 6 h were prepared. The different phases were identified by Xray diffraction (XRD) and their structures were examined by optical and scanning electron microscopes.…”

Section: Introductionmentioning

confidence: 99%

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Influence of SiO2 and/or MnO2 on the Reduction Behaviour and Structure Changes of Fe2O3 Compacts with CO Gas

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Reduction Kinetics and Catastrophic Swelling of MnO2-doped Fe2O3 Compacts with CO at 1073-1373 K

Cited by 27 publications

References 12 publications

Effects of Reducing Gas on Swelling and Iron Whisker Formation during the Reduction of Iron Oxide Compact

Effects of Reducing Gas on Swelling and Iron Whisker Formation during the Reduction of Iron Oxide Compact

A Model for the Reduction of Metal Oxides by Carbon Monoxide

Influence of SiO<sub>2</sub> and/or MnO<sub>2</sub> on the Reduction Behaviour and Structure Changes of Fe<sub>2</sub>O<sub>3</sub> Compacts with CO Gas

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