還元鉄鉱石のH<SUB>2</SUB>-CO-CO<SUB>2</SUB>混合ガスによる炭化速度

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タイトル別名
  • Carbidization Rate of Reduced Iron Ore in H<SUB>2</SUB>-CO-CO<SUB>2</SUB> Gas Mixture
  • 還元鉄鉱石のH2-CO-CO2混合ガスによる炭化速度
  • カンゲン テッコウセキ ノ H2 CO CO2 コンゴウ ガス ニ ヨル タンカ ソクド

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The carbidization rate of iron ore was thermogravimetrically measured and analyzed in H2-H2S-CO-CO2 gas mixtures from 873K to 1073K, after it was completely reduced in H2-H2S gas mixture. Both gases contained sulfur low enough not to form sulfide. The fractional carbidization, fθ[-], is defined as the mass gain relative to the mass of carbon converting iron to cementite completely, θ-Fe3C. It grew along a parabolic curve without such a nucleation period as the carbidization CO-CO2 system. Then, it grew linearly forming percarbide, χ-Fe5C2 after fθ=0.5. The authors considered that the nucleation resistance of cementite and percarbide was reduced by higher carbon supersaturation than that in CO-CO2 system.<BR>It assumed that the carbidization rate was controlled by carburization of metal with CO and the reaction interface decreased linearly with the amount of metal. Thus, the curve was analyzed using the equation of first order reaction: -1n(1-fθ)=Rt, where the carbidization rate, R [s-1] is constant with time. The maximum rate was obtained at about 20 vol% H2 in H2-CO system. This fact agreed with Turkdogan and his co-workers' previous work for carbon deposition. As the results, the author showed the adsorbed OH catalyzed carbidization in the following reaction:<BR>CO(g)+OH(ad)=CO2(g)+1/2 H2.<BR>Sulfur suppressed the reaction with OH(ad) more strongly than O(ad).

収録刊行物

  • 鉄と鋼

    鉄と鋼 85 (1), 20-26, 1999

    一般社団法人 日本鉄鋼協会

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