Rapid reduction of fine iron ore transported with CH4 Gas

Yohei Nomura, Hiroshi Nakagawa, Takayuki Maeda, Koki Nishioka, Masakata Shimizu

Research output: Contribution to journalReview article

14 Citations (Scopus)

Abstract

Acceleration of reduction rate and decrease of reaction temperature in ironmaking process are key issues to reduce the CO2 emission and the energy consumption. To solve the problem, effective use of H2 gas or CH4 gas including both reducing agent of carbon and hydrogen is proposed. Therefore, a laboratory scale fine iron ore particles-gas conveyed system was utilized to measure the reduction rates of fine ore by using H 2 and CH4 gas at high temperature. H2-N 2 and CH4-N2 mixture having various flow rates and compositions were flowed downward with fine iron ore through a cylindrical reactor maintained at a constant temperature of 1373 to 1723K. The reduction process was found to proceed in such manner that the iron ore particles were reduced topochemically under the condition of 1573K. The reduction rate in CH4 gas became larger than that in H2 gas with increase in the temperature, because of the contribution of carbon deposited on the surface of iron ore particle. Fractional reduction of ore in CH4 gas reached over 0.8 at 1573K in 1 s. In the reaction rate analysis, it was concluded that the major fraction of overall reaction resistance was attributable to chemical reaction between the iron oxide and the carbon dissolved in metallic iron. The activation energy in CH4 reduction was evaluated to be 192.5 kJ/mol and it was almost same as that in decomposition of CH4.

Original languageEnglish
Pages (from-to)521-527
Number of pages7
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume91
Issue number6
DOIs
Publication statusPublished - Jun 2005

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iron ores
Iron ores
Gases
gases
Carbon
Ores
carbon
minerals
Temperature
Reducing Agents
energy consumption
Reducing agents
Iron oxides
iron oxides
Reaction rates
temperature
Chemical reactions
Hydrogen
chemical reactions
reaction kinetics

All Science Journal Classification (ASJC) codes

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

Cite this

Rapid reduction of fine iron ore transported with CH4 Gas. / Nomura, Yohei; Nakagawa, Hiroshi; Maeda, Takayuki; Nishioka, Koki; Shimizu, Masakata.

In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, Vol. 91, No. 6, 06.2005, p. 521-527.

Research output: Contribution to journalReview article

Nomura, Yohei ; Nakagawa, Hiroshi ; Maeda, Takayuki ; Nishioka, Koki ; Shimizu, Masakata. / Rapid reduction of fine iron ore transported with CH4 Gas. In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan. 2005 ; Vol. 91, No. 6. pp. 521-527.
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