Effect of Mixed-grinding on Reduction Process of Carbonaceous Material and Iron Oxide Composite

Eiki Kasai, Fumio Saito, Katsuhito Mae

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50 Citations (Scopus)


Mixing state and structure of composite significantly influence reduction kinetics of carbonaceous materials/iron oxides mixture. The present study reports the effect of mixed-grinding of the mixture on the reduction of the composite by indirect heating. Mixtures prepared by different combinations of hematite and graphite reagents, iron ores and metallurgical coke were mixed-ground by two types of ball mills. TG-DTA measurements for the composites were carried out under different heating patterns and total pressures. Reaction temperature remarkably decreases by the mixed-grinding operation in any combinations of materials and total pressures. A catalytic effect of iron produced during reaction is observed when using graphite reagents but seems to be inhibited when using metallurgical coke. A simple kinetic analysis suggests that gasification of carbon is promoted through enhancement of the catalytic effect and/or change of rate limiting step from the gasification of carbon to the direct reactions between iron oxides and carbon.

Original languageEnglish
Pages (from-to)1444-1451
Number of pages8
JournalIsij International
Issue number12
Publication statusPublished - 1995


  • ball mill
  • carbon gasification
  • catalytic effect
  • coke
  • graphite
  • iron ore
  • mixed-grinding
  • reduction

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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