Liquid purification or separation – Filter – Movable medium
Patent
1993-12-21
1995-10-17
Dawson, Robert A.
Liquid purification or separation
Filter
Movable medium
2103601, 210379, 2103801, 210381, 49 27, 49 28, 49 29, B04B 100
Patent
active
054587760
ABSTRACT:
A centrifuge for dewatering a fluent aggregate material such as sand. Sand slurry is conducted into a rotating cylindrical drum which has a perforated lateral wall against which a screen is placed. The drum is oriented with the axis disposed vertically. When the centrifuge operates, centrifugal action slings slurry poured into the drum outwardly. Upon contacting the lateral wall, the slurry builds up. When a certain quantity of the slurry has built up at the bottom or floor of the cylinder, additional material cannot resist migrating upwardly. Thickness of the trapped layer varies, being greater at the floor, near the source of the incoming slurry. This trapped layer forms a bed having an inclined wall. Thickness of the bed at the top of the cylinder is determined by a circumferential, inwardly projecting flange or dam located at the top of the cylindrical drum. The sand bed protects metal parts of the centrifuge from abrasion, and also enables water to diffuse therethrough. Water is discharged through perforations in the lateral wall, and dewatered sand continues to migrate upwardly. At the top of the drum, this sand migrates beyond the flange, and is slung outwardly against a shroud, which directs the sand to an outer conveyor or chute therebelow. This shroud includes an internal shelf which traps a layer of sand protecting the shroud from erosion by sand ejected from the drum. Water is trapped by a second shroud, and is collected at a suitable discharge chute or conduit.
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Preisser Mark A.
Storruste Steinar
Dawson Robert A.
Haahjem North American, Inc.
Litman Richard C.
Reifsnyder David
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