Reaction Model for the Formation of Partially Reduced Iron by Heating Iron Ore-coal Char Composite Pellet in Oxygen Bearing Gas Flow

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  • 炭材内装ペレットの酸素含有ガス流中での加熱による部分還元鉄生成の反応モデル
  • タンザイ ナイソウ ペレット ノ サンソ ガンユウ ガスリュウ チュウ デ ノ カネツ ニ ヨル ブブン カンゲンテツ セイセイ ノ ハンノウ モデル

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Abstract

A basic research on the production of partially reduced iron by heating iron ore-coal char composite pellet was conducted by using a pellet in oxygen bearing gas flow. Oxygen in the reaction gas generates heat by combusting carbon to very efficiently compensate the heat consumed by the strongly endothermic reaction of carbon C+CO2=2CO, while oxygen also re-oxidized reduced iron. A simple non-isothermal model for the reaction was made to simulate the very complicated phenomena. We approximated the reduction of iron oxides and the gasification of carbon to be of first-order one-step reaction, respectively. Further we assume that the shrinking-core model is applicable to the penetration of oxygen into the pellet under the diffusion limit of oxygen in the gas film and the re-oxidized product shell. By applying the reaction model, we succeeded in simulating the experimental results.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 85 (6), 447-451, 1999

    The Iron and Steel Institute of Japan

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