Rate of reduction of ore-carbon composites

Part I. Determination of intrinsic rate constants

Otavio M Fortini, R. J. Fruehan

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

A process for ironmaking was proposed consisting of the combination of a rotary hearth furnace and a bath smelter employing wood charcoal as reductant and energy source. This article examines reactions in composites of iron oxides and carbon at elevated temperatures in conditions developed to minimize the influence of mass and heat transfer to the overall rates. A combined reaction model considering the steps of carbon oxidation and reduction of the iron oxides was developed allowing the measurement of rate constants for carbon oxidation and wustite reduction to be used in a comprehensive pellet model developed in Part II of the current article. This analysis showed that wustite reduction can have a significant effect on the overall rate of reduction in composites at high temperatures or in the presence of large excess of carbon. Rate constants measured for graphite showed that graphite is as reactive as wood charcoal, possibly due to the catalysis of graphite or its higher temperature dependence. The poisoning of carbon surfaces by CO is less significant than anticipated from works of previous authors.

Original languageEnglish (US)
Pages (from-to)865-872
Number of pages8
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume36
Issue number6
DOIs
StatePublished - Dec 1 2005

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Ores
Rate constants
Carbon
minerals
Graphite
composite materials
carbon
Composite materials
charcoal
Charcoal
graphite
Iron oxides
iron oxides
Wood
hearths
Oxidation
oxidation
poisoning
Reducing Agents
energy sources

Cite this

Rate of reduction of ore-carbon composites : Part I. Determination of intrinsic rate constants. / Fortini, Otavio M; Fruehan, R. J.

In: Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, Vol. 36, No. 6, 01.12.2005, p. 865-872.

Research output: Contribution to journalArticle

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