Abstract
The oxidation of pyrite ore in air was studied using a fixed-bed flow reactor. Under isothermal conditions, this oxidation showed a maximum rate during the initial stage and a linear decreasing rate thereafter, and the fractional oxidation versus time curves were in good agreement with a shrinking unreacted-core model. The oxidation rate was affected by the particle size of the pyrite ore. A large particle showed a small initial reaction rate and a large activation energy. Besides, the rate-determining step of a large particle was found to be an interface reac- tion process while for fine particles it is a diffusion process.
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