Particle classification in the reflux classifier.

Abstract The Reflux Classifier is an innovative device offering advantages in both particle size classification and gravity separation. The system is a combination of a conventional fluidised bed and sets of parallel inclined plates as used to achieve a high throughput in a lamella settler. A reflux action develops as a result of fluidised particles segregating onto the inclined plates, and returning to the fluidised zone below. This in turn generates improved separation performance. A kinematic analysis that accounts for the high throughput of the device is presented. Experimental results showing the size classification of glass sphere particles (−200+20 μm) are presented, demonstrating the performance of the device.

[1]  Ronald F. Probstein,et al.  Lamella and tube settlers. 1. Model and operation , 1983 .

[2]  V. S. Patwardhan,et al.  Sedimentation and liquid fluidization of solid particles of different sizes and densities , 1985 .

[3]  Robert H. Davis,et al.  Hindered settling function with no empirical parameters for polydisperse suspensions , 1994 .

[4]  Prediction of complete mixing of liquid-fluidized binary solid particles , 1986 .

[5]  Jacob H. Masliyah,et al.  ]Hindered settling in a multi-species particle system , 1979 .

[6]  Naoyuki Funamizu,et al.  An improved Richardson-Zaki formula for computing mixed layer composition in binary solid-liquid fluidized beds , 1995 .

[7]  Kuan M. Yao,et al.  Design of High-Rate Settlers , 1973 .

[8]  J. F. Richardson,et al.  Sedimentation and fluidisation: Part I , 1997 .

[9]  Andreas Acrivos,et al.  Enhanced sedimentation in settling tanks with inclined walls , 1979, Journal of Fluid Mechanics.

[10]  Gravity separation of concentrated bidisperse suspensions in inclined plate settlers , 1988 .

[11]  A. Maimoni.  Lamella settlers: Material balances and clarification rates , 1988 .

[12]  Andreas Acrivos,et al.  Sedimentation and sediment flow on inclined surfaces , 1990, Journal of Fluid Mechanics.

[13]  Kevin P. Galvin,et al.  A generalized empirical description for particle slip velocities in liquid fluidized beds , 1999 .

[14]  Robert H. Davis,et al.  Particle classification for dilute suspensions using an inclined settler , 1989 .