mechanism and kinetics of reduction of a feo fe2o3 cao
Kinetics and Mechanism of the Simultaneous Carbothermic
The carbothermic reduction of 38.7 pct MnO-12.1 pct CaO-5.4 pct MgO-9.3 pct Al 2 O 3 -24.1 pct SiO 2 -10.4 pct FeO slag in Ar at 1600 °C was studied using the sessile drop wettability technique. Pure graphite coke and charcoal were used as the carbon material substrates. The reduction rates were evaluated by sampling at different reduction times and by analyzing the chemical compositions of
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The reduction mechanism and kinetics of Fe 2 O 3 by
Mar 23 2017 · Low-grade hydrogen-containing gases can be converted into high-value pure hydrogen by chemical-looping hydrogen generation. Iron-based oxygen carrier is believed to be the most suitable oxygen carrier for CLHG. It is essential to investigate the reduction mechanism and kinetics of Fe2O3 with hydrogen. The reduction of Fe2O3 by H2 was conducted in a thermogravimetric analyzer at
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Reduction Behavior of EAF Slags Containing Cr2O3 Using
The simultaneous reduction kinetics of Cr 2O 3 MnO FeO and SiO 2 in the EAF slag by aluminum has been investigated at 1793K to understand the reduction mechanism of each oxide in the stainless steelmaking conditions. The reduction degree of MnO reached about 90 and that of FeO and Cr 2O 3 reached about 80 for 5min. The reduction degree of SiO
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Kinetics and Mechanism of the Simultaneous Carbothermic
The carbothermic reduction of 38.7 pct MnO-12.1 pct CaO-5.4 pct MgO-9.3 pct Al 2 O 3 -24.1 pct SiO 2 -10.4 pct FeO slag in Ar at 1600 °C was studied using the sessile drop wettability technique. Pure graphite coke and charcoal were used as the carbon material substrates. The reduction rates were evaluated by sampling at different reduction times and by analyzing the chemical compositions of
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Mechanism and kinetics of reduction of a FeO-Fe2O3-CaO-MgO
Mechanism and kinetics of reduction of a FeO-Fe2O3-CaO-MgO aluminosilicate melt in a high-CO-activity environment Reid F. Cooper Rebecca L.A. Everman Justin W. Hustoft Sang-Heon Dan Shim Mechanism and kinetics of reduction of a FeO-Fe 2 O 3-CaO-MgO aluminosilicate melt in a particularly in comparison to melts of similar
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Solid-state reaction kinetics of the system CaO-FeO
The solid-state reaction mechanisms of the CaO-FeO system have been studied by a diffusion couple method in the temperature range of 1073 to 1273 K under controlled oxygen-partial pressures. The interdiffusivities and intrinsic diffusivities of Ca2 and Fe2 have been determined in the limited FeO solid-solution range. Based on the obtained results a solid-state reaction model of the system
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Mechanism of Carbothermic Reduction of Hematite in
mental studies on the mechanism and kinetics of carbother-mic reduction of iron oxide was energetically carried out for the carbon composite iron ore agglomerates. In a simul-taneous reaction using a hematite–graphite facing pair Kashiwaya et al.7) found the starting temperature of gasifi-cation decreased from 1173 to 873K in the facing pair
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Kinetics and Mechanism of the Simultaneous Carbothermic
The carbothermic reduction of 38.7 pct MnO-12.1 pct CaO-5.4 pct MgO-9.3 pct Al2O3-24.1 pct SiO2-10.4 pct FeO slag in Ar at 1600 °C was studied using the sessile drop wettability technique. Pure graphite coke and charcoal were used as the carbon material substrates. The reduction rates were evaluated by sampling at different reduction times and by analyzing the chemical compositions of the
Get PriceReaction kinetics and phase transformation during hydrogen
Nov 01 2016 · Thus it is clear that the kinetic change during the Fe 3 O 4 reduction (0.15 ≤ α < 1) of spherical agglomerate nanopowder has no effect on the intermediate phase transformation to FeO. 4.4. Sintering effect on the discontinuity in reduction kinetics. It is important to understand the influence of sintering effects on reduction kinetics.
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Influence of CaO and SiO2 on the Reducibility of Wüstite
reduction mechanisms of interfacial chemical reaction gaseous mass transport solid state diffusion of oxygen or a combination of these individual mechanisms termed the mixed control. The contribution of each mechanism with the content of CaO or SiO 2 affecting the reduction
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Mechanism and kinetics of reduction of a FeO-Fe2O 3-CaO
Mechanism and kinetics of reduction of a FeO-Fe 2 O 3-CaO-MgO aluminosilicate melt in a high-CO-activity environment Reid F. Cooper Rebecca L.A. Everman Justin W. Hustoft Sang Heon Dan Shim Research output Contribution to journal › Article › peer-review
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Reduction of Iron Oxide Catalysts The Investigation of
The mechanisms and kinetics of the reduction of powdered Fe2O3 and Fe3O4 samples have been investigated under nonisothermal conditions to provide a detailed insight into the processes occurring. Both conventional linear heating temperature-programmed reduction (TPR) and constant rate temperature-programmed reduction (CR-TPR) techniques were utilized. Fe2O3 was found to reduce
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Smelting reduction reactions by solid carbon using
Jul 18 2013 · (2006). Smelting reduction reactions by solid carbon using induction furnace foaming behaviour and kinetics of FeO reduction in CaO–SiO2–FeO slag. Ironmaking Steelmaking Vol. 33 No. 3 pp. .
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Probing the surface of promoted CuO-Cr2O3-Fe2O3 catalysts
Aug 15 2020 · While addition of K 2 O somewhat preserved the interfacial regions and facilitated the reduction kinetics of surface oxygen both Na 2 O and CaO significantly suppressed the availability of metallic Cu as well as the Cu-FeO x interfaces leading to decreased reactivity. These findings provide a direction to promote the copper-iron catalysts by
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Reaction kinetics and phase transformation during hydrogen
Nov 01 2016 · Thus it is clear that the kinetic change during the Fe 3 O 4 reduction (0.15 ≤ α < 1) of spherical agglomerate nanopowder has no effect on the intermediate phase transformation to FeO. 4.4. Sintering effect on the discontinuity in reduction kinetics. It is important to understand the influence of sintering effects on reduction kinetics.
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Reduction Behavior of EAF Slags Containing Cr2O3 Using
The simultaneous reduction kinetics of Cr 2O 3 MnO FeO and SiO 2 in the EAF slag by aluminum has been investigated at 1793K to understand the reduction mechanism of each oxide in the stainless steelmaking conditions. The reduction degree of MnO reached about 90 and that of FeO and Cr 2O 3 reached about 80 for 5min. The reduction degree of SiO
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Effect of Silica on Reduction of Calcium Ferrite with CO
Reduction kinetics measured through thermogravimetric analysis (TGA) in terms of iron oxides has been developed but is almost not involved in the description of the multistep of the reduction mechanism. In this study the reducibility of the CaO–Fe 2O 3–SiO 2 system with series of silica addi-tion was compared. The reduction mechanism was
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Kinetics and Mechanism of Decarburization and Melting of
Kinetics and Mechanism of Decarburization and Melting of DRI Pellets in Slag JIANGHUA LI and MANSOOR BARATI An experimental study was conducted to understand the decarburization and melting behavior of DRI pellets in SiO 2–Al 2 O 3–CaO–MgO–FeO slags with various FeO contents (10 to 25 wt pct) and basicities ranging from 1.5 to 2.5.
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Mechanism and kinetics of reduction of a FeO-Fe2O3-CaO
Title Mechanism and kinetics of reduction of a FeO-Fe2O3-CaO-MgO aluminosilicate melt in a high-CO-activity environment Author Reid F. Cooper
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Solid-state reaction kinetics of the system CaO-FeO
The solid-state reaction mechanisms of the CaO-FeO system have been studied by a diffusion couple method in the temperature range of 1073 to 1273 K under controlled oxygen-partial pressures. The interdiffusivities and intrinsic diffusivities of Ca2 and Fe2 have been determined in the limited FeO solid-solution range. Based on the obtained results a solid-state reaction model of the system
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Kinetics of chromite ore reduction from MgO-CaO-SiO2-FeO
Kinetic experiments were performed in an induction furnace to investigate the reduction of chromite ore by carbon dissolved in a high carbon ferrochromium alloy melt under conditions of varying Cr 2 O 3 concentration slag basicity and temperature. The results obtained show that chromite reduction by dissolved carbon in slag systems of the type MgO-CaO-SiO 2-FeO-Cr 2 O 3Al 2 O 3 occurs
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Kinetics of reduction of lead smelting slags with solid carbon
Research techniques and a methodology have been developed that enable the reduction kinetics of molten lead smelting slags with solid carbon to be studied. The rates of reduction of PbO-FeO-Fe2O3-CaO-SiO2 slags with carbon have been measured for a range of slag compositions for PbO concentrations between 3 and 100 weight percent and temperatures between 1423 and 1573 K.
Get Price(PDF) Kinetics of reduction of FeO in CaO-SiO2-FeO slags
The mechanism of reduction of iron and chromium oxide from synthetic electric arc furnace stainless steelmaking slags has been studied. The activation energy for reduction of FeO depends on the
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The reduction mechanism and kinetics of Fe2O3 by hydrogen
The mechanism and kinetics of CO reduction on iron-based oxygen carriers namely pure Fe2O3 and Fe2O3 supported by alumina (Fe2O3/Al2O3) were investigated using thermo-gravimetric analysis.
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Kinetics of chromite ore reduction from MgO-CaO-SiO2-FeO
Kinetic experiments were performed in an induction furnace to investigate the reduction of chromite ore by carbon dissolved in a high carbon ferrochromium alloy melt under conditions of varying Cr 2 O 3 concentration slag basicity and temperature. The results obtained show that chromite reduction by dissolved carbon in slag systems of the type MgO-CaO-SiO 2-FeO-Cr 2 O 3Al 2 O 3 occurs
Get PriceKinetics of the reduction of hematite (Fe2O3) by methane
Oct 01 2013 · Once a thin layer of lower iron oxides (wüsite) is formed on the surface then the mechanism shifts to two simultaneous reaction mechanism (Fe 2 O 3 to FeO and produce CO and H 2 intrinsic topochemical kinetics and Fe 2 O 3 to Fe 3 O 4 and produce CO 2 and H 2 O nucleation and growth kinetics).
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Review and data evaluation for high-temperature reduction
melting behaviour and reduction kinetics. The phase trans-formation mechanism contains two aspects the reduction sequence and the characteristics of the topochemical reductioninterface.MaedaandOno 25 studiedthereduction sequence and reduction equilibrium of CaO–Fe 2O 3–Al 2O 3 ternary calcium ferrite with CO–CO 2 mixture. It was found
Get PriceEffect of Silica on Reduction of Calcium Ferrite with CO
Reduction kinetics measured through thermogravimetric analysis (TGA) in terms of iron oxides has been developed but is almost not involved in the description of the multistep of the reduction mechanism. In this study the reducibility of the CaO–Fe 2O 3–SiO 2 system with series of silica addi-tion was compared. The reduction mechanism was
Get PriceKinetics and Mechanism of Decarburization and Melting of
Kinetics and Mechanism of Decarburization and Melting of DRI Pellets in Slag JIANGHUA LI and MANSOOR BARATI An experimental study was conducted to understand the decarburization and melting behavior of DRI pellets in SiO 2–Al 2 O 3–CaO–MgO–FeO slags with various FeO contents (10 to 25 wt pct) and basicities ranging from 1.5 to 2.5.
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