Kinetics of Cementite Formation from Reduced Iron in CO-H_2-H_2S Mixtures under Pressurized Conditions

この論文にアクセスする

この論文をさがす

著者

抄録

In the present authors' previous study, the rate of iron carbide formation from completely reduced iron ore was gravimetrically measured in CO-H<sub>2</sub>-H<sub>2</sub>S mixtures of sulfur activity 0.035 to 0.6 at the total pressure of 0.1 to 0.6 MPa and at the temperature of 773 to 1 023 K. From the experimental results under the wide conditions, it was derived that the rate of iron carbide formation was controlled by the carburization reaction on the pore surface of reduced iron. In this study, the integrated rate equation for the first order reaction, −ln(1−<i>f</i><sub>θ</sub>)=g(<i>p<sub>i</sub></i>, <i>T</i>)<i>t</i>, was applicable to cementite formation curves, <i>f</i><sub>θ</sub> <i>versus</i> <i>t</i> relation, in the range of iron carbide formation, <i>i.e.</i> <i>f</i><sub>θ</sub><0.6. The value of g(<i>p<sub>i</sub></i>, <i>T</i>) is proportional to the partial pressure of carbon monoxide, <i>p</i><sub>CO</sub>, in the reaction gas containing hydrogen more than 20%. From the dependency of g(<i>p<sub>i</sub></i>, <i>T</i>) on <i>p</i><sub>CO</sub>, it was assumed that the rate controlling elementary reaction for the carburization of reduced iron is the dissociative adsorption of carbon monoxide on the pore surface. Following the elementary reaction, the rate equation for the carburization was derived substituting the adsorption isotherm for sulfur; g(<i>p<sub>i</sub></i>, <i>T</i>)=<i>k</i><sub>CO</sub>(<i>p</i><sub>CO</sub>−<i>a</i><sub>C</sub> <i>p</i>H<sub>2</sub>O/<i>K</i><sub>2</sub><i>p</i>H<sub>2</sub>)/(1+<i>K</i><sub>S</sub><i>a</i><sub>S</sub>). The relation between <i>p</i><sub>CO</sub>/g(<i>p<sub>i</sub></i>, <i>T</i>) and <i>a</i><sub>S</sub> derived by rearranging the rate equation was applied to the data for g(<i>p<sub>i</sub></i>, <i>T</i>) to obtain <i>k</i><sub>CO</sub> and <i>K</i><sub>S</sub>. At the individual temperatures, the good linear relation was observed. The temperature functions for <i>k</i><sub>CO</sub> and <i>K</i><sub>S</sub> were obtained. The rate equation substituted with the values of <i>k</i><sub>CO</sub> and <i>K</i><sub>S</sub> for the carburization simulated reasonably well the carbide formation curves in the range <i>f</i><sub>θ</sub><0.6.

収録刊行物

  • ISIJ international

    ISIJ international 44(6), 992-998, 2004-06-15

    一般社団法人 日本鉄鋼協会

参考文献:  26件中 1-26件 を表示

  • <no title>

    GARRAWAY R.

    Iron Steelmaker 23(6), 27, 1996

    被引用文献4件

  • <no title>

    NAKAGAWA H.

    Tetsu-to-Hagane 82, 261, 1996

    被引用文献12件

  • <no title>

    HAYASHI S.

    ISIJ Int. 37, 16, 1997

    被引用文献26件

  • <no title>

    HAYASHI S.

    ISIJ Int. 37, 345, 1997

    被引用文献18件

  • <no title>

    HAYASHI S.

    ISIJ Int. 38, 1053, 1998

    被引用文献15件

  • <no title>

    NAKAGAWA H.

    Tetsu - to - Hagane 85, 14, 1999

    被引用文献7件

  • <no title>

    SAWAI S.

    Tetsu - to - Hagane 84, 844, 1998

    被引用文献10件

  • <no title>

    SAWAI S.

    Tetsu-to-Hagane 85, 6, 1999

    被引用文献7件

  • <no title>

    SAWAI S.

    Tetsu-to-Hagane 85, 20, 1999

    被引用文献9件

  • <no title>

    HAYASHI S.

    Tetsu-to-Hagane 86, 285, 2000

    被引用文献6件

  • <no title>

    HAYASHI S.

    Tetsu-to-Hagane 86, 641, 2000

    被引用文献3件

  • <no title>

    IGUCHI Y.

    Metall. Mater. Trans. B 32, 1161, 2001

    被引用文献5件

  • <no title>

    IGUCHI Y.

    Tetsu-to-Hagane 87, 396, 2001

    被引用文献4件

  • <no title>

    KOUDA T.

    ISIJ Int. 42, S28, 2002

    被引用文献3件

  • <no title>

    HORII K.

    Tetsu-to-Hagane 89, 1011, 2003

    被引用文献2件

  • <no title>

    YAGITA K.

    Tetsu-to-Hagane 89, 1005, 2003

    被引用文献2件

  • <no title>

    IGUCHI Y.

    ISIJ Int. 44, 984, 2004

    被引用文献1件

  • <no title>

    GRABKE H. J.

    Arch. Eisenhuttenwes. 46, 75, 1975

    被引用文献2件

  • <no title>

    GRABKE H. J.

    Arch. Eisenhuttenwes. 46, 215, 1975

    被引用文献3件

  • <no title>

    SHATYNSKI S. R.

    Arch. Eisenhuttenwes 49, 129, 1978

    被引用文献7件

  • <no title>

    OLSSON R. G.

    Metall. Trans. 5, 21, 1974

    被引用文献3件

  • <no title>

    FRUEHAN R. J.

    Metall. Trans. 4, 2129, 1973

    被引用文献2件

  • <no title>

    COLLIN R.

    J. Iron Steel Inst. 210, 777, 1972

    被引用文献1件

  • <no title>

    GRABKE H. J.

    Surf.Sci 67, 501, 1977

    被引用文献10件

  • <no title>

    HAYASHI S.

    Ironmaking Steelmaking 27, 111, 2000

    DOI 被引用文献3件

  • <no title>

    MESCHTER P. J.

    Metall. Trans. 10, 323, 1979

    DOI 被引用文献5件

被引用文献:  2件中 1-2件 を表示

各種コード

ページトップへ