Measurement of Hydrogen Reduction Rates of FeO in 2FeO &amp;middot;SiO&lt;SUB&gt;2&lt;/SUB&gt; and CaO &amp;middot; FeO &amp;middot;SiO&lt;SUB&gt;2&lt;/SUB&gt;

Ono-Nakazato, Hideki; Tsubone, Youhei; Takaki, Yoshiyuki; Usui, Tateo

doi:10.2355/tetsutohagane1955.87.5_320

Cited by 7 publications

(5 citation statements)

References 5 publications

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“…In case of the powder packed bed, this model can represent the reduction behavior when the chemical reaction limits the rate, and the reduction proceeds uniformly in the particle. 13) Accordingly, in the present study, the samples were sufficiently smashed, until there was no effect of the particle size on the reduction behavior and the chemical reaction rate-limiting is attained for the powder packed bed. The apparent reaction rate constant is determined by applying this model, as described in the following sections.…”

Section: (8)mentioning

confidence: 99%

Effect of Water-Gas Shift Reaction on Reduction of Iron Oxide Powder Packed Bed with H2-CO Mixtures

2003

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Although the hydrogen reduction is thermally more disadvantageous than the CO reduction, it is advantageous that the reduction rate with H 2 is much larger than that with CO. In order to examine the effective use of hydrogen, the reduction of FeO 1.05 powder packed bed with H 2 -CO mixture was conducted, and the results were analyzed by a proposed model. The temperature, at which the reduction equilibria of FeO 1.05 with H 2 and CO equal, is determined to be 1 093 K from the present results. The apparent rate constants are determined to be 33, 8.6 and 15 for the reduction of FeO 1.05 with H 2 , CO and H 2 -CO mixture (V -H 2 : V -CO ϭ1 : 1), respectively. In the proposed model, when the water-gas shift reaction is taken into account, the additivity is established on the dependence of the rate constant of the reaction on the gas composition. When the water-gas shift reaction is not taken into account, the rate constant deviates negatively from the additivity. The apparent rate constants of the reduction determined in the present study take the middle values, and the contribution of the water-gas shift reaction is estimated to be 3 % against its equilibrium. In reducing FeO 1.05 with CO, the time when the sample is perfectly reduced is shortened by adding a small amount of H 2 , and the rate enhancement effect of H 2 on the gaseous reduction remarkably appears at 1 093 K. The effect originates in the proceeding of the water-gas shift reaction.

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Section: (8)mentioning

confidence: 99%

Effect of Water-Gas Shift Reaction on Reduction of Iron Oxide Powder Packed Bed with H2-CO Mixtures

2003

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“…This is because that Slag C is rather difficult to permeate in comparison to Slag A and B from the viewpoint of viscosity, 12) although the reducibility of Slag C itself is worse than that of slag A © 2005 ISIJ or B. 7,13,14) On the other hand, both slag A and B easily permeate the pore, and the reducibility becomes worse. When the reducibility of the pellet including Slag A and B is compared, the reducibility of the pellet including Slag B is a little better than that including Slag A, which is in accordance with the reducibility of slag A and B themselves.…”

Section: The Reducibility Of Oxide Pellet Including Caosio 2 -Fe T O mentioning

confidence: 97%

Effects of Slag Content and Composition on the Reducibility of Iron Oxide Including CaO-SiO2-FetO Slag

2005

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“…Tateo USUI, 1) * Yasuhiro NAKAMURO, 2) Masahiro NISHI, 3) Masaaki NAITO, 4) Hideki ONO 5) and Paulo Santos ASSIS 6) 1) Joining and Welding Research Institute, Osaka University, 11-1, Mihogaoka, Ibaraki, Osaka, 567-0047 Japan.…”

Section: Gaseous Reduction Model For Sinter In Consideration Of Calcimentioning

confidence: 99%

“…As Sugiyama et al 1) reported, quaternary calcium ferrite (abbreviated by CF, afterward) in commercial iron ore sinter takes in SiO 2 by considerable amount and makes it harmless, because SiO 2 causes to produce very hard-to-be-reduced minerals, 2) such as 2FeO·SiO 2 (fayalite) and CaO·FeO·SiO 2 . Also CF is one of the important mineral phases having good reducibility next to iron oxides.…”

Section: Introductionmentioning

confidence: 99%

Gaseous Reduction Model for Sinter in Consideration of Calcium Ferrite Reaction Process (Unreacted-core Shrinking Model for Six Interfaces)

et al. 2015

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Measurement of Hydrogen Reduction Rates of FeO in 2FeO ·SiO<SUB>2</SUB> and CaO · FeO ·SiO<SUB>2</SUB>

Cited by 7 publications

References 5 publications

Effect of Water-Gas Shift Reaction on Reduction of Iron Oxide Powder Packed Bed with H2-CO Mixtures

Effect of Water-Gas Shift Reaction on Reduction of Iron Oxide Powder Packed Bed with H2-CO Mixtures

Effects of Slag Content and Composition on the Reducibility of Iron Oxide Including CaO-SiO2-FetO Slag

Gaseous Reduction Model for Sinter in Consideration of Calcium Ferrite Reaction Process (Unreacted-core Shrinking Model for Six Interfaces)

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