Quantitative evaluation of reaction mode and reduction disintegration behavior of iron ore agglomerates during low temperature reduction

Moritoshi Mizutani, Tsunehisa Nishimura, Takashi Orimoto, Kenichi Higushi, Seiji Nomura, Koji Saito, Eiki Kasai

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The utilization of H2 in the ironmaking process is a potential option for a further reduction of CO2 emission from the blast furnace (BF). H2 promotes the reduction reaction of burden materials, but its influence on their reduction disintegration behavior remains unknown in detail. This study investigates its influence on the specified essential factors governing the reduction disintegration behavior of the iron ore agglomerates, i.e., iron ore sinters and pellets. Reduction disintegration index (RDI) values were measured after the reduction of the agglomerate samples using the gas mixtures of CO–H2–CO2–N2. The mineral textures of reduced samples were observed using an optical-microscope and an electron probe micro-analyzer for the evaluation of reaction modes. Further, Thiele modulus (), which is considered as the index of reaction modes during reduction, was calculated using the measurement results. The calculated showed reasonable correlation with RMI values, which is one index of the reaction mode evaluated by an elemental analysis using EPMA. Disintegration does not make much progress when is larger than a certain limit value, whereas it proceeds significantly when is less than that value.

Original languageEnglish
Pages (from-to)1761-1767
Number of pages7
JournalIsij International
Volume58
Issue number10
DOIs
Publication statusPublished - 2018 Oct

Keywords

  • Blast furnace
  • Hydrogen
  • Reaction mode
  • Reduction disintegration
  • Thiele modulus

ASJC Scopus subject areas

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

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