焼結鉱のCO-CO<SUB>2</SUB>-N<SUB>2</SUB>混合ガス還元の初期段階におけるカルシウムフェライトの還元挙動に及ぼすCO分圧と還元温度の影響

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タイトル別名
  • Influence of CO Ratio and Reduction Temperature upon the Reducibility of Calcium Ferrite in Sinter in the Initial Stage of Reduction with CO-CO<SUB>2</SUB>-N<SUB>2</SUB> Gas Mixture
  • 焼結鉱のCO-CO2-N2混合ガス還元の初期段階におけるカルシウムフェライトの還元挙動に及ぼすCO分圧と還元温度の影響
  • ショウケツコウ ノ CO CO2 N2 コンゴウ ガス カンゲン ノ ショキ

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The reduction behavior of calcium ferrite (CF) in commercial sinter in the initial stage was examined by the gravimetric method.<BR>In a previous work, final fractional reduction, Ff, obtained in the reduction stage from hematite to magnetite at GRVCO/(VCO + VCO<SUB>2</SUB>) = 0.2 (V: flow rate) and EPMA, X-ray and microscopic analyses clarified that at 1003 K and more CF was reduced to magnetite but below about 1003 K CF was hardly reduced and Ff_??_0.7 when the oxygen reducible in this stage was assumed to come from hematite and Fe2O3 in CF.<BR>In the present work, influence of both CO ratio GR and reduction temperature T upon the reducibility was studied by changing either GR or T while keeping the counterpart constant. The following "quasiequilibrium line" below which CF was not reduced was found out within the magnetite stable region in the equilibrium diagram for Fe-C-O system:<BR>T = 1030 - 10.2GR - 801GR2 (873≅T≅1023 K)<BR>When GR or T were decreased after CF was reduced, "re-oxidation" took place below this line. Long term reduction curve in twice as much as the period for ordinary experiments demonstrated that eight hours were long enough to judge the reducibility of CF and determine Ff.

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  • 鉄と鋼

    鉄と鋼 78 (7), 982-989, 1992

    一般社団法人 日本鉄鋼協会

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