Reduction of hematite compacts by H2-CO gas mixtures

Il Joon Moon, Chang Hee Rhee, Dong Joon Min

Research output: Contribution to journalArticle

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Abstract

The reduction behaviour of hematite compacts by H2-CO gas mixtures was investigated at 1073∼1223 K. The total porosity, pore size distribution and surface area of the compact was measured using mercury pressure porosimeter. The reduction tests were carried out using Cahn balance. The reduction behaviour could not be described in terms of a single rate-determining step; the reduction process was initially controlled by the chemical reaction at the oxide/iron interface, controlled by the intraparticle diffusion through the reduced layer towards the end of reduction, and the mixed control, in between. Over the whole range, the reduction rate decreased with CO content in the gas mixture. The chemical reaction rate constants were two to three times higher for H2 reduction than those of CO reduction, and the effective diffusiveness of H2 reduction were three to four times higher than those of CO reduction. Values of activation energy for chemical reaction were found to be 19.8-42.1 kJ/mol depending on the gas compositions; 100% CO showing the lowest.

Original languageEnglish
Pages (from-to)302-306
Number of pages5
JournalSteel Research
Volume69
Issue number8
DOIs
Publication statusPublished - 1998 Jan 1

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Hematite
Carbon Monoxide
hematite
Gas mixtures
gas mixtures
chemical reactions
Chemical reactions
porosity
Porosimeters
ferric oxide
gas composition
iron oxides
reaction kinetics
Mercury
Iron oxides
Pore size
Reaction rates
activation energy
Rate constants
Activation energy

All Science Journal Classification (ASJC) codes

  • Metals and Alloys

Cite this

Moon, Il Joon ; Rhee, Chang Hee ; Min, Dong Joon. / Reduction of hematite compacts by H2-CO gas mixtures. In: Steel Research. 1998 ; Vol. 69, No. 8. pp. 302-306.
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Reduction of hematite compacts by H2-CO gas mixtures. / Moon, Il Joon; Rhee, Chang Hee; Min, Dong Joon.

In: Steel Research, Vol. 69, No. 8, 01.01.1998, p. 302-306.

Research output: Contribution to journalArticle

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AU - Moon, Il Joon

AU - Rhee, Chang Hee

AU - Min, Dong Joon

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AB - The reduction behaviour of hematite compacts by H2-CO gas mixtures was investigated at 1073∼1223 K. The total porosity, pore size distribution and surface area of the compact was measured using mercury pressure porosimeter. The reduction tests were carried out using Cahn balance. The reduction behaviour could not be described in terms of a single rate-determining step; the reduction process was initially controlled by the chemical reaction at the oxide/iron interface, controlled by the intraparticle diffusion through the reduced layer towards the end of reduction, and the mixed control, in between. Over the whole range, the reduction rate decreased with CO content in the gas mixture. The chemical reaction rate constants were two to three times higher for H2 reduction than those of CO reduction, and the effective diffusiveness of H2 reduction were three to four times higher than those of CO reduction. Values of activation energy for chemical reaction were found to be 19.8-42.1 kJ/mol depending on the gas compositions; 100% CO showing the lowest.

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