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By R.Q. Honaker, W.R. Forrest

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Electronic edition published 2009. F. 1966. Axial dispersion of spheres fluidized with liquids. E. Journal. 12:24–30. M. 1973. Differential settling by size of two particle species in a liquid. Trans. Inst. Chem. Engrs. 51:281–292. M. 1974. Relative particle velocities in two-species settling. Powder Technology. 10:67–71. H. 1979. Hindered settling in a multi-species particle system. Chem. Engng. Sci. 34:1166–1168. , and Chiba, T. 1982. A comprehensive interpretation of solid layer inversion in liquid fluidized beds.

The control system is essential in keeping the equilibrium balance inside the column between incoming feed solids and discharging products, as well as maintaining the proper fluidized bed density. Only particles having sufficient mass can pass through the bed and settle to the underflow stream. Thus, the fluidized particle bed creates an autogenous separating medium. , 1988). The key operating variables of the column are teeter water rate, solids feed rate, and pressure sensor set point. As noted previously, the teeter water rate is directly related to the upward velocity of the water current that counters the settling of the particles.

The results are presented in terms of fractional recovery (partition) curves. For selected tests, the simulation results are compared with experimental results obtained from the testing of a laboratory hindered-settling column. INTRODUCTION Hindered settling occurs when the settling rate of a particle in a liquid suspension is affected by the presence of nearby particles (Allen and Baudet, 1977). In a free-settling environment, the effect of particle size dominates the settling rate of particles, while during hindered settling, the effect of particle density on the settling rate is enhanced.

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