Rate-determining steps for reduction in magnetite-coal pellets

A comprehensive modelling approach and experimental results were used to test possible rate-determining steps for direct reduction in pellets containing fine magnetite and coal. In support of the modelling approach, a survey of rate constants from the literature is presented. Heat transfer was found...

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Bibliographic Details
Published in:Minerals engineering 2002-11, Vol.15 (11), p.919-929
Main Authors: Coetsee, T, Pistorius, P.C, de Villiers, E.E
Format: Article
Language:English
Subjects:
Applied sciences
Coal
Direct reduction
Exact sciences and technology
Iron and steel making
Iron ores
Metals. Metallurgy
Modelling
Production of metals
Reaction kinetics
Reduction
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Summary:A comprehensive modelling approach and experimental results were used to test possible rate-determining steps for direct reduction in pellets containing fine magnetite and coal. In support of the modelling approach, a survey of rate constants from the literature is presented. Heat transfer was found not to be limiting for the reduction reaction (although conduction within the pellet limits the rate of devolatilisation of the coal). For average rate constants, the chemical reactions are under mixed control (by the reduction and Boudouard reactions). The reductant also affects the product quality, since most of the sulphur in the reductant is retained in the direct-reduced product.
ISSN:0892-6875
1872-9444
DOI:10.1016/S0892-6875(02)00120-6