Die Reduktion der Eisenerze

Bogdandy, Ludwig von; Engell, Hans Jürgen

doi:10.1007/978-3-642-92935-9

Cited by 72 publications

(17 citation statements)

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“…Here, we assume cation vacancy to be the major structural defect in wustite. This simple structure model can successfully explain the experimental results (23) for vacancy concentration as a function of temperature and oxygen partial pressure with the aid of mass action law. Recent complex defect models such as the KochCohen cluster model (24), in which the cluster consists of one tetrahedral interstitial of iron and twelve cation vacancies as its nearest neighbour, have not yet been used sufficiently for thermochemical calculation.…”

Section: Analysis Of Specimenmentioning

confidence: 80%

Redox Equilibria in Wustite Doped with CaO, SrO and BaO

Iguchi

Kubokoya²,

Hirao

1988

Trans. JIM

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This study was performed to obtain the concentration of defects and the activities of components in wustite doped with MeO(Me: Ca, Sr and Ba). The composition as FeO-Fe2/3O-MeO for wustite in equilibrium with CO-CO2 gas mixtures of Pco2/Pco=30/70, 50/50 and 60/40 at temperatures of 1273, 1373 and 1473K, was determined by an analytical method utilizing the weight loss during reduction. The concentration of cation vacancies (V"Fe) is estimated as one-third of the mole fraction of Fe2/3O. The value of (V"Fe) increases with an increase in the amount of MeO and in the ionic radius of Me except for the higher concentrations of CaO. The increase in the value of (V"Fe) may be interpreted qualitatively by considering that the strain generated due to the difference in radius in the substitutional dissolution of MeO were estimated by Schuhmann's method from the oxygen pressure contours for wustite doped with CaO at 1273K.

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Section: Analysis Of Specimenmentioning

confidence: 80%

Redox Equilibria in Wustite Doped with CaO, SrO and BaO

Iguchi

Kubokoya²,

Hirao

1988

Trans. JIM

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“…6) If those diagrams are combined, a diagram is developed for the thermodynamical efficiency of both reduction agents at different temperatures, Fig. 1.…”

Section: Thermodynamical Aspects Of Reductionmentioning

confidence: 99%

Research in the Reduction of Iron Ore Agglomerates Including Coal and C-containing Dust

et al. 2005

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The Department of Ferrous Metallurgy (IEHK) since long has been investigating in the conversion of carbonaceous matter and smelting together with the reduction of iron bearing raws and materials. Actual research is being carried out in the development and improvement of self reducing carbonaceous iron bearing agglomerates. It was found that the kinetics of known reduction processes are transferable to the new agglomerates with respect to new phenomena such as alteration of shape and volume. The examined agglomerates are partly charged in new so-called alternative processes, and shaft furnaces, e.g. Tecnored and OxiCup process. These processes are currently being transferred from pilot to industrial plant scale. IEHK is partner in the ongoing research of those processes.

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“…The Baur-Glaessner-figure was calculated from thermodynamic data. 8,9) For gas mixture of H 2 , H 2 O, CO, CO 2 , CH 4 and N 2 with CO concentration less then 10 vol% 6,8) and p H 2 Ͼp CO reduction with H 2 is the dominating reaction.…”

Section: Variation Of Temperature In Pre-reduction Stagementioning

confidence: 99%