The use of a tapered fluidization column to continuously classify streams of dissimilar solids has been investigated. Solids classification is based on the different propensity of dissimilar solids to segregate when operated under in the transient fluidization regime. A test apparatus based on this concept was set up and operated with mixtures of solids having equal density (about 2500 kg/m3) and different diameter (flotsam=125 μm, jetsam = 500 μm). The jetsam mass fraction of the mixture (XJ0) ranged between 0.25 and 0.75. The mass flow rate ranged between 2.4 and 5.8 kg/h. Results showed that the jetsam fractional mass in the jetsam-enriched stream was nearly 100% and that in the flotsam-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 classifier was successfully carried out for more than six hours, with excellent reliability and steadiness of the performance.
A fluid-bed continuous classifier of polydisperse granular solids / Olivieri, Giuseppe; Marzocchella, Antonio; Salatino, Piero. - ELETTRONICO. - (2006), pp. 1-10. (Intervento presentato al convegno Fifth World Congress on Particle Technology tenutosi a Orlando, FL nel April 23 – 27, 2006).
A fluid-bed continuous classifier of polydisperse granular solids
OLIVIERI, GIUSEPPE;MARZOCCHELLA, ANTONIO;SALATINO, PIERO
2006
Abstract
The use of a tapered fluidization column to continuously classify streams of dissimilar solids has been investigated. Solids classification is based on the different propensity of dissimilar solids to segregate when operated under in the transient fluidization regime. A test apparatus based on this concept was set up and operated with mixtures of solids having equal density (about 2500 kg/m3) and different diameter (flotsam=125 μm, jetsam = 500 μm). The jetsam mass fraction of the mixture (XJ0) ranged between 0.25 and 0.75. The mass flow rate ranged between 2.4 and 5.8 kg/h. Results showed that the jetsam fractional mass in the jetsam-enriched stream was nearly 100% and that in the flotsam-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 classifier was successfully carried out for more than six hours, with excellent reliability and steadiness of the performance.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
