Abstract
The oxidation of pyrrhotite particles of 51 and 88 Μm size was studied during falling in a downward stream of O2-N2 gas mixture. At the temperature of reaction tube lower than 825 K, the oxidation rate of particles of 51 Μm size was higher than that of 88 Μm. At higher temperature, on the other hand, the oxidation rate was virtually unvaried with the particle size, and the fractional reaction of oxidized particles increased in proportion to the oxygen partial pressure. Progress of oxidation and fusion of the particles was calculated based on a mathematical model. According to the calculation, when the particle temperature was attained at about 1100 K, it increased instantaneously and the particles were melted, because the rate of heat loss from the particles was overbalanced by the rate of heat generation due to oxidation.
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Asaki, Z., Mori, S., Ikeda, M. et al. Oxidation of pyrrhotite particles falling through a vertical tube. Metall Trans B 16, 627–638 (1985). https://doi.org/10.1007/BF02654860
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DOI: https://doi.org/10.1007/BF02654860