The reduction of iron oxides by volatiles in a rotary hearth furnace process: Part III. The simulation of volatile reduction in a multi-layer rotary hearth furnace process

Il Sohn, R. J. Fruehan

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Abstract

For reduction of iron oxides by volatiles from coal, the major reductant was found to be H 2, and it can affect the overall reduction of iron oxides. In this study, the reduction by actual volatiles of composite pellets at 1000 °C was studied. The volatile reduction of the hand-packed Fe 2O 3/coal composite pellet as it is devolatilizing out of the pellet was found to be negligible. However, the reduction of iron oxide pellets at the top layer by volatiles from the bottom layers of a three-layer pellet geometry was observed to be about 15 pet. From the morphological observations of partially reduced pellets and the computed rates of bulk mass transfer, volatile reduction appears to be controlled by a mixed-controlled mechanism of bulk gas mass transfer and the limited-mixed control reduction kinetics. Using the reduction rate obtained from the single pellet experiments with pure hydrogen and extrapolating this rate to an H 2 partial pressure corresponding to the H 2 from the volatiles, an empirical relationship was obtained to approximately predict the amount of volatile reduction up to 20 pet.

Original languageEnglish
Pages (from-to)231-238
Number of pages8
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume37
Issue number2
DOIs
Publication statusPublished - 2006 Apr 1

Fingerprint

hearths
Iron oxides
iron oxides
pellets
furnaces
Furnaces
simulation
coal
mass transfer
Coal
Mass transfer
composite materials
ferric oxide
Hydrogen
partial pressure
Reducing Agents
Composite materials
Partial pressure
Gases
kinetics

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

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abstract = "For reduction of iron oxides by volatiles from coal, the major reductant was found to be H 2, and it can affect the overall reduction of iron oxides. In this study, the reduction by actual volatiles of composite pellets at 1000 °C was studied. The volatile reduction of the hand-packed Fe 2O 3/coal composite pellet as it is devolatilizing out of the pellet was found to be negligible. However, the reduction of iron oxide pellets at the top layer by volatiles from the bottom layers of a three-layer pellet geometry was observed to be about 15 pet. From the morphological observations of partially reduced pellets and the computed rates of bulk mass transfer, volatile reduction appears to be controlled by a mixed-controlled mechanism of bulk gas mass transfer and the limited-mixed control reduction kinetics. Using the reduction rate obtained from the single pellet experiments with pure hydrogen and extrapolating this rate to an H 2 partial pressure corresponding to the H 2 from the volatiles, an empirical relationship was obtained to approximately predict the amount of volatile reduction up to 20 pet.",
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AU - Sohn, Il

AU - Fruehan, R. J.

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N2 - For reduction of iron oxides by volatiles from coal, the major reductant was found to be H 2, and it can affect the overall reduction of iron oxides. In this study, the reduction by actual volatiles of composite pellets at 1000 °C was studied. The volatile reduction of the hand-packed Fe 2O 3/coal composite pellet as it is devolatilizing out of the pellet was found to be negligible. However, the reduction of iron oxide pellets at the top layer by volatiles from the bottom layers of a three-layer pellet geometry was observed to be about 15 pet. From the morphological observations of partially reduced pellets and the computed rates of bulk mass transfer, volatile reduction appears to be controlled by a mixed-controlled mechanism of bulk gas mass transfer and the limited-mixed control reduction kinetics. Using the reduction rate obtained from the single pellet experiments with pure hydrogen and extrapolating this rate to an H 2 partial pressure corresponding to the H 2 from the volatiles, an empirical relationship was obtained to approximately predict the amount of volatile reduction up to 20 pet.

AB - For reduction of iron oxides by volatiles from coal, the major reductant was found to be H 2, and it can affect the overall reduction of iron oxides. In this study, the reduction by actual volatiles of composite pellets at 1000 °C was studied. The volatile reduction of the hand-packed Fe 2O 3/coal composite pellet as it is devolatilizing out of the pellet was found to be negligible. However, the reduction of iron oxide pellets at the top layer by volatiles from the bottom layers of a three-layer pellet geometry was observed to be about 15 pet. From the morphological observations of partially reduced pellets and the computed rates of bulk mass transfer, volatile reduction appears to be controlled by a mixed-controlled mechanism of bulk gas mass transfer and the limited-mixed control reduction kinetics. Using the reduction rate obtained from the single pellet experiments with pure hydrogen and extrapolating this rate to an H 2 partial pressure corresponding to the H 2 from the volatiles, an empirical relationship was obtained to approximately predict the amount of volatile reduction up to 20 pet.

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