Gaseous Reduction Behavior of Partial Reduced Iron Ore Hot Briquettes with CO-CO<SUB>2</SUB> Mixture

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Other Title
  • 部分還元鉄鉱石熱間圧粉体のCO-CO<SUB>2</SUB>混合ガスによる還元反応挙動
  • 部分還元鉄鉱石熱間圧粉体のCO-CO2混合ガスによる還元反応挙動
  • ブブン カンゲン テッコウセキ ネツカン アップンタイ ノ CO CO2 コンゴウ ガス ニ ヨル カンゲン ハンノウ キョドウ

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Abstract

Two types of iron ores were reduced partially until some levels of metallization in a laboratory fluidized bed. These fines were briquetted under cold or hot press machines. Then the briquettes were isothermally reduced in a thermobalance at 900-1200°C with CO-CO2 mixture to elucidate their kinetics, imaging semi reduced iron burdens in a blast furnace.<BR>The briquettes from Australian are indicated a severe reduction delay in whole periods above 1100°C due to the formation of liquid slag. The addition of 2% MgO into briquettes released fairly this delay. The briquettes from Brazilian are poor in gangues indicated no reduction delay even at 1200°C.<BR>The briquettes seemed to be reduced according to the first order reaction equation on remained wustite. The obtained rate parameters kM were almost similar between cold and hot briquettes in spite of more density and crushing strength for the latter than the former, because smooth gas diffusion was ensured insides due to both briquettes having relatively large porosities.<BR>Crushing strength of hot briquettes reached more than 1000 N/briquette.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 90 (12), 999-1003, 2004

    The Iron and Steel Institute of Japan

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