Kinetics of the reaction of CH4 gas with liquid iron

K. Sekino, T. Nagasaka, R. J. Fruehan

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7 Citations (Scopus)

Abstract

In iron bath smelting and other processes that use coal, the effective use of volatile matter can improve the energy efficiency of the process. The reaction of simulated volatile (CH4) with iron was studied. The rate of carburization of liquid iron by CH4 gas was measured between 1400 °C and 1700 °C under conditions for which the effect of mass transfer can be corrected with reasonable accuracy. The rate was measured for partial pressures of CH4 in Ar in the range of 0.02 to 0.06 atm and sulfur contents in the metal from 0.0006 to 0.5 mass pct. The results indicate that the rate of carburization may be controlled by the dissociation of CH4 on the surface. Sulfur was found to decrease the rate, and the residual rate phenomenon was observed for high sulfur contents. The rate constant may be represented by the following equation: {Mathematical expression} where k o, k r, K s, and a s are the bare surface rate constant, residual rate constant, adsorption coefficient for sulfur, and activity of sulfur in the metal, respectively. The second term in the rate equation represents the rate of dissociation on the adsorbed sulfur. The rate constants and adsorption coefficient were determined as functions of temperature to be {Mathematical expression}

Original languageEnglish
Pages (from-to)317-324
Number of pages8
JournalMetallurgical and Materials Transactions B
Volume26
Issue number2
DOIs
Publication statusPublished - 1995 Apr

ASJC Scopus subject areas

  • Engineering(all)

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