Rate of Iron Carbide Formation from Reduced Iron in CO-H_2-H_2S Mixtures under Pressurized Conditions

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概要

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• Under pressurized conditions up to 0.6 MPa, the rate of the iron carbide formation from completely reduced iron in CO-H2-H2S mixtures was measured by gravimetric technique. The fractional conversion for carbide formation, fθ, was defined as the weight gain divided by the weight of carbon for the complete conversion to cementite. First, the compositions of the partially reacted samples were analyzed by Mössbauer absorption spectroscopy. Then, the fractional conversion calculated from the composition, fθM, was compared with fθ. The value of fθ agreed reasonably with that of fθM in the range fθ<0.8, from which the gravimetric method is proved to be valid to the measurements for the rate of iron carbide formation. The carbide formation curves, fθ versus t relation, were not influenced by the weight of the sample and the flow rate of the reaction gas in the conditions; 50 mg, more than 3.33×10−6 m3/s. Cross sectional view indicated the homogeneous distribution of cementite regions in the reduced iron particles partially converted to cementite. On the other hand, the rate was very sensitive to the conditions of the carburization reaction on the pore surface. The rate increased with increasing the content of carbon monoxide up to 80 to 90%, where the rate was the maximum, and then gradually decreased with further increasing the content. The rate increased with the total pressure, but decreased with the activity of sulfur. The rate controlling step of the iron carbide formation was discussed on the basis of the experimental results. The rate controlling step was assumed to be the carburization reactions on the pore surface of reduced iron particles.

• 社団法人 日本鉄鋼協会の論文
• 2004-06-15

著者

• Hayashi Shoji

  Nagare College Nagoya Institute Of Technology

• Iguchi Y

  Waseda Univ. Tokyo Jpn

• Shibata Toshihiro

  Graduate School Nagoya Institute Of Technology

• Shibata Toshihiro

  Nagoya Institute Of Technology

• IGUCHI Yoshiaki

  TSUKURI College, Nagoya Institute of Technology

• HORI-I Kazuyoshi

  Nagoya Institute of Technology

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• Rate of Iron Carbide Formation from Reduced Iron in CO-H_2-H_2S Mixtures under Pressurized Conditions
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