Classifying – separating – and assorting solids – Magnetic – Paramagnetic
Patent
1990-12-31
1992-08-18
Huppert, Michael S.
Classifying, separating, and assorting solids
Magnetic
Paramagnetic
2105121, B04C 504, B04C 5081, B04C 514
Patent
active
051396521
ABSTRACT:
A centrifugal cleaner has a cleaning quotient greater than 0.5 and a rejects by weight performance value typically of less than 5% (e.g. less than 2%) for conventional paper pulp furnish. The tangential inlet nozzle to the side wall near the top of the cleaner body has a non-circular--preferably D-shaped--inlet opening so as to provide enhanced throughput. The cleaner body side wall includes an upper portion that is conical and extends past the top nozzle, a generally cylindrical center portion which significantly increases retention time within the cleaner, and a conical bottom portion in which a bottom nozzle is operatively disposed. The bottom nozzle has a rejects opening therein with a diameter that is about 25-45% (preferbly roughly 1/3) of the internal diameter of the side wall at the opening, and is about 25-45% (preferably roughly 1/3) of the internal diameter of the top nozzle. The bottom nozzle may have an insert with an interior three-dimensional parabolic surface terminating at its bottom in the rejects opening, or may comprise a flat plate with a main top surface perpendicular to the top nozzle. During use rejects particles collect on the flat plate top surface and define a generally parabolic configuration.
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A. Ahlstrom Corporation
Huppert Michael S.
Wacyra Edward M.
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