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Abstract

A centrifugal classification apparatus for separating particulate solids, such as sand, in a fluid mixture into fractions having common physical characteristics, such as particle size and/or weight. The apparatus includes a frusto-conical hollow shell rotatable about a longitudinal rotation axis and having an inlet opening at one end for receiving the fluid mixture and an outlet opening at its other end; a discharge aperture in the shell between its inlet and outlet openings through which the solids may pass; and a collecting compartment fast with the shell and located about the discharge aperture for collecting a fraction of the solids having common physical characteristics. The compartment extends radially outwardly from the shell and has a radial depth greater than the maximum longitudinal width of the aperture, a closable discharge orifice at its radially outer end; and a valve at the orifice for controlling discharge of solids from the compartment. The apparatus also has a flushing means for introducing a counter-current flushing fluid into the collecting compartment between its discharge orifice and the aperture. A further embodiment of the apparatus includes a weir projecting circumferentially from the shell and located between the inlet and outlet openings. In addition, the aperture is divided into two apertures by a circumferential splitting member spanning the aperture.

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First Claim