Importance

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Abstract

A method and apparatus allow the efficient grading of a fiber suspension (e.g. paper pulp) having a consistency of 0.5% or more. A cyclone separator has its rejects outlet connected to a rejects chamber with a solid confining surface. A rotor is mounted for rotation in the rejects chamber adjacent its discharge opening, and accelerates the rotational speed of suspension flowing into the rejects chamber to continue the grading action of the cyclone. Accepts that are discharged from the rejects chamber are recirculated to the inlet to the cyclone separator, while the rejects are passed out for disposal or other action. Vertically extending ribs may be provided along the solid interior walls of the rejects chamber, which act with the rotor to efficiently break up fiber flocks in the suspension. The rotor may include foils which are dimensioned and oriented so as to produce a slight pumping effect on the suspension being rotated to facilitate its discharge through the accepts outlet, upwardly from a middle portion of the rejects chamber.

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First Claim