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The reduction of stannic oxide with carbon

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Abstract

The rate of reduction of stannic oxide (cassiterite) with carbonaceous materials was investigated in the temperature range 1073 to 1273 K, using thermogravimetic analysis. The effects of the type, the particle size, and the relative amount of carbon were studied. The results indicate that cassiterite is reduced directly to Sn proceeding through the gaseous intermediates of CO and CO2. The overall rate of reduction is controlled by the oxidation of carbon by CO2 ·

An energy of activation of 220.9 kj/mole (52.8 kcal/mole) was calculated for the reduction of SnO2 with coconut charcoal within the temperature range 1073 to 1173 K and 323.8 kjJ.mole (77.4 kcalJ.mole) with graphite within the temperature range 1198 to 1273 K.

A direct comparison was made between the rate of oxidation of coconut charcoal in CO2- CO mixtures and the rate of reduction of SnO2 with coconut charcoal, which are not in agreement. The reason for this disagreement was found to be the catalytic action of the tin formed during the reduction.

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Authors and Affiliations

  1. Universidad Tecnica de Oruro, Oruro, Bolivia

    Rafael Padilla

  2. Department of Metallurgy and Metallurgical Engineering, University of Utah, 84112, Salt Lake City, UT

    H. Y. Sohn (Associate Professor)

Authors
  1. Rafael Padilla
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  2. H. Y. Sohn
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Formerly Graduate Student in the Department of Metallurgy and Metallurgical Engineering, University of Utah.

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Padilla, R., Sohn, H.Y. The reduction of stannic oxide with carbon. Metall Trans B 10, 109–115 (1979). https://doi.org/10.1007/BF02653980

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  • DOI: https://doi.org/10.1007/BF02653980

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