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Fluidized bed roasting of molybdenite-effect of operating variables

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Abstract

The results of an investigation on the fluidized bed roasting of molybdenite are reported. Molybdenite mixed with quartz was subjected to an oxidizing roast in a 22 mm diam stainless steel batch fluidized bed reactor. Enriched air (with O2) or diluted air (with N2) was used as the fluidizing and oxidizing gas. In addition to the MoS2 content of the solids and the O2 content of the gas, the effect of temperature and flow rate was also examined. For the range of variables investigated, it was found that the temperature influences the rate of the roasting reaction greatly. The gas flow rate affects the conversion favorably up to a certain fluidizing flow rate. An increase in the O2 content of the gas and the MoS2 of the solids results in higher conversion levels. The unreacted core kinetic model was applied to the results; and the energy of activation for the reaction was obtained from the Arrhenius plot as 31,100 cal/gmol of MoS2. The data obtained should be useful in the design and operation of larger scale roasting reactors.

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Authors and Affiliations

  1. Mining and Metallurgical Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt

    M. A. Doheim (Associate Professor) & M. Z. Abdel-Wahab (Professor)

  2. Ministry of Industry, Cairo

    S. A. Rassoul (Production Manager)

Authors
  1. M. A. Doheim
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  2. M. Z. Abdel-Wahab
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  3. S. A. Rassoul
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Doheim, M.A., Abdel-Wahab, M.Z. & Rassoul, S.A. Fluidized bed roasting of molybdenite-effect of operating variables. Metall Trans B 7, 477–483 (1976). https://doi.org/10.1007/BF02652719

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  • DOI: https://doi.org/10.1007/BF02652719

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