Chemical state mapping of heterogeneous reduction of iron ore sinter

M. Kimura, Y. Takeichi, R. Murao, I. Obayashi, Y. Hiraoka, Y. Liu

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

Iron ore sinter constitutes the major component of the iron-bearing burden in blast furnaces, and its reduction mechanism is one of the keys to improving the productivity of ironmaking. Iron ore sinter is composed of multiple iron oxide phases and calcium ferrites (CFs), and their heterogeneous reduction was investigated in terms of changes in iron chemical state: FeIII, FeII, and Fe0 were examined macroscopically by 2D X-ray absorption and microscopically by 3D transmission X-ray microscopy (TXM). It was shown that the reduction starts at iron oxide grains rather than at calcium ferrite (CF) grains, especially those located near micropores. The heterogeneous reduction causes crack formation and deteriorates the mechanical strength of the sinter. These results help us to understand the fundamental aspects of heterogeneous reduction schemes in iron ore sinter.

Original languageEnglish
Article number012015
JournalJournal of Physics: Conference Series
Volume849
Issue number1
DOIs
Publication statusPublished - 2017 Jun 14
Event13th International X-ray Microscopy Conference, XRM 2016 - Oxford, United Kingdom
Duration: 2016 Aug 152016 Aug 19

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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