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

Ichiro Araki, Takayuki Maeda, Takeaki Murayama, Yoichi Ono

Research output: Contribution to journalArticle

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

Fingerprint

thermobalances
Hematite
Carbon Monoxide
hematite
Gas mixtures
Powders
gas mixtures
baskets
Fluidized beds
beds
Chemical reactions
chemical reactions
Reaction rates
ferric oxide
Rate constants
sintering
reaction kinetics
Sintering
tubes
sensitivity

All Science Journal Classification (ASJC) codes

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

Cite this

Measurement of reduction rate of hematite powder with CO-CO2 gas mixture by using thermobalance. / Araki, Ichiro; Maeda, Takayuki; Murayama, Takeaki; Ono, Yoichi.

In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, Vol. 82, No. 7, 01.01.1996, p. 558-563.

Research output: Contribution to journalArticle

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