A Fluid-Bed Continuous Classifier of Polydisperse Granular Solids

摘要

The use of a tapered fluidization column to continuously classify streams of dissimilarsolids has been investigated. Solids classification is based on the different propensity ofdissimilar solids to segregate when operated under in the transient fluidization regime. Atest apparatus based on this concept was set up and operated with mixtures of solidshaving equal density (about 2500 kg/mm3) and different diameter (flotsam=125 μm, jetsam= 500 μm). The jetsam mass fraction of the mixture (X) XJ0 J0) ranged between 0.25 and0.75. The mass flow rate ranged between 2.4 and 5.8 kg/h. Results showed that thejetsam fractional mass in the jetsam-enriched stream was nearly 100% and that in theflotsam-enriched stream was as low as 2-4%, under the operating conditions investigated.The overall classification effectiveness was as high as 85%. Operation of the classifierwas successfully carried out for more than six hours, with excellent reliability andsteadiness of the performance.)