| Title |
A Study on the Rate Phenomena in Particulate Flash Reaction of Chalcopyrite (1) ( Experimental Study on the Kinetics of Desulfurization and Particle Fragmentation ) |
| Abstract |
The chemical rate phenomena associated with the flash reaction of chalcopyrite have been examined by the in-flight flash reactor system. In the gas-solid reaction stage, dissociation and subsequent oxidation of labile sulfur near the reacting particle enhance the heat ing of particles which eventually leads to the rapid preferential oxidation of iron sulfide in dissociated particles. The rate determining step of this stage is found to be mass transfer through the boundary layer. Due to the exothermicity of reaction, particles are melted during the reaction. It is found that because of the rapid increase of particle temperature and gas evolution within the molten core, a particle is fragmented to spherical droplets any oxide crust. The extend and shape of fragmented particle varies with the initial size and surroundings. Typical shapes under different experimental conditions are presented and discussed in this study. |