Reduction mechanism of FexO - Graphite composite under elevating temperature

Chishiro Funada, Taichi Murakami, Eiki Kasai

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Since iron ore-carbon composite permits rapid reduction reaction, its utilization is an effective method to reduce carbon dioxide emissions in ironmaking process. Major iron ores consist of Fe2O3, Fe3O4, and FeOOH, which require several reduction steps through FexO to form metallic iron. In this study, FexO, which has a certain solid solution range, was highlighted as an alternative iron source for the composite. It is because FexO can be produced by a pre-reduction process of iron ores although it is not a major component of natural ores. The effect of the oxygen concentration of the FexO and the mix-grinding time of the iron oxide and carbonaceous material on the reduction behavior of the composite was examined. The composite samples of FexO with different oxygen concentrations, i.e., different x value and graphite were prepared and heated up to 1 200°C under inert gas flow. The value of reduction degree was calculated from the concentration of gas generated from the composite. Reduction temperature decreases with increasing x value and the grinding time. In the case of a 3.6 ks-grinding, reduction reaction of the composite with a low x value proceeded homogeneously, while reduction of that with a high x value proceeded topochemically.

Original languageEnglish
Pages (from-to)233-238
Number of pages6
JournalISIJ International
Issue number2
Publication statusPublished - 2016


  • Catalytic effect
  • Iron ore-carbon composite
  • Reduction mechanism
  • Wüstite


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