2009
DOI: 10.1007/s11663-009-9315-2
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Abstract: The reduction of iron oxide fines to wustite between 590°C and 1000°C with a CO-CO 2 gas mixture of low reducing potential was studied. The reduction kinetics and the dominating reaction mechanism varied with the temperature, extent of reduction, and type of iron oxide. Reduction from hematite to wustite proceeded in two consecutive reaction steps with magnetite as an intermediate oxide. The first reduction step (hematite to magnetite) was fast and controlled by external gas mass transfer independently of the … Show more

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Cited by 32 publications
(21 citation statements)
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“…Corbari and Fruehan studied the reduction of iron oxide fines to wüstite using a CO/CO 2 gas mixture. Grain sizes between 110 μm and 3 mm were investigated at 1000 °C.…”
Section: Rate‐limiting Mechanism During Iron Oxide Reductionmentioning
confidence: 99%
“…Corbari and Fruehan studied the reduction of iron oxide fines to wüstite using a CO/CO 2 gas mixture. Grain sizes between 110 μm and 3 mm were investigated at 1000 °C.…”
Section: Rate‐limiting Mechanism During Iron Oxide Reductionmentioning
confidence: 99%
“…[8][9][10][11][12][13][14] Bohn and Cleeton [12] found the value of activation energy to be 90 ± 29 kJ/mol for the step of Fe 3 O 4 reduction to Fe 0.947 O in the overall reduction of hematite in carbon monoxide and carbon dioxide mixtures in a fluidized bed. They found that the reduction reaction was first order with respect to the concentration of CO which is consistent with our findings in this work.…”
Section: H Comparison With Related Previous Workmentioning
confidence: 99%
“…The reduction of hematite fines (highly porous oxide, moderately porous oxides, and dense oxides) to wustite with a CO and CO 2 mixture at the temperatures of 863 K to 1273 K (590°C to 1000°C) was studied by Corbari and Fruehan. [14] They found that in their experimental configuration external gas mass transfer controlled the first reduction step (Fe 2 O 3 to Fe 3 O 4 ), while the reduction mechanism of the second step (Fe 3 O 4 to Fe 0.947 O) varied with the temperature.…”
Section: Introductionmentioning
confidence: 99%
“…The first reduction step (Fe 2 O 3 to Fe 3 O 4 ) was fast and the second reduction step (Fe 3 O 4 to FeO) was the overall reaction-controlling step. [9,10] Moreover, it was found that the structure of the hematite fines tended to be loose and porous and to have a higher reduction degree and less metallic iron formation on the surface of the mineral fines with the elapse of time due to the carbon adherence to the hematite fines, and it helped to prevent the fines from binding together.…”
Section: Introductionmentioning
confidence: 99%