Measurement of reduction rate of hematite powder with CO-CO2 gas mixture by using thermobalance

Ichiro Araki, Takayuki Maeda, Takeaki Murayama, Yoichi Ono

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Abstract

The reduction rate of hematite powder (0.15mm in diameter) with CO-CO2 gas mixture was measured by a thermobalance of which sensitivity was 1μg. The sample was put into a Pt-basket and the basket was suspended in a reaction tube from the balance. The weight of sample should be less than 0.2g in order to obtain the reduction rate of a single hematite particle accurately. The reduction rate was controlled by interface chemical reaction because the reduction product layer was porous. The chemical reaction rate constant kc was obtained at 600°C-900°C. The value of kc decreased with a rise of temperature because of sintering of hematite layer. The obtained value of kc was applied to the analysis of fluidized bed reduction of hematite powder with CO-CO2 gas mixture. The calculated reduction curves agreed well with the measured ones by fluidized bed.

Original languageEnglish
Pages (from-to)558-563
Number of pages6
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume82
Issue number7
DOIs
Publication statusPublished - Jan 1 1996

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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