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Kinetics of vaporization of lead sulfide

  • Physical chemistry
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Abstract

The kinetics of vaporization of lead sulfide were investigated in the temperature range 785 to 993 °C using a thermogravimetric balance. The effect of nonreactive ambient atmosphere on the vaporization kinetics was examined in some detail. Under He-rich He-N2 atmosphere the rate of vaporization was found to be about four times as large, as that under N2-atmosphere. A mathematical model was developed taking into consideration the chemical kinetic and mass-transfer factors. It was found that faster vaporization rates obtained with He-rich atmosphere are due to the higher diffusivity of PbS(g) in He(g). The chemical kinetic aspects of vaporization appear to be unaffected by the ambient atmosphere. The activation energy for vaporization has a value of 198.95 kJ·mole-1 in the temperature range investigated. The evaporation coefficient was found to have values ranging from 0.05 to 0.14.

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Authors and Affiliations

  1. Metallurgical Engineering, FB-10, University of Washington, 98195, Seattle, WA

    S. K. El-Rahaiby (Graduate Research Assistant) & Y. K. Rao (Professor)

Authors
  1. S. K. El-Rahaiby
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  2. Y. K. Rao
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El-Rahaiby, S.K., Rao, Y.K. Kinetics of vaporization of lead sulfide. Metall Trans B 13, 633–641 (1982). https://doi.org/10.1007/BF02650021

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  • DOI: https://doi.org/10.1007/BF02650021

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