Separation of solids from liquids by screening
AssigneeContra-Shear Holdings Limited
InventorsGeorge Burgess, Ernest W. Pitches
Life of this patent
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Abstract
An apparatus for the separation of solids and liquids from a suspension has a hollow drum rotatably mounted about a horizontal axis. The drum wall is a screen made of a plurality of wires, preferably wedge-sectioned wires; spaced apart in a parallel arrangement and lying axially along the drum. Inlet means direct the suspension against the inner surface of the wall at an angle less than right angles, and preferably substantially tangentially to the inner surface, in a direction opposing the rotation of the drum. The separated solids remain within the drum and are extracted therefrom by suitable means.
Claims29
An apparatus for the separation of solids and liquids from a suspension by screening, said apparatus comprising:
- a screening drum having a hollow interior and a screening wall which has a plurality of screening wires spaced apart in a parallel arrangement about the periphery of the drum and lying subtantially axially along the drum;
- mounting means whereby said drum is mounted to be rotatable in one direction about its axis which lies in a substantially horizontal direction plane;
- driving means to rotate the drum;
- and
- inlet means to introduce a flow of the suspension into the interior of the drum and to direct substantially all of this flow against an inner surface of the wall of the drum so that the flow of the suspension where it strikes the drum wall is in a direction opposing the direction of movement of the wall of the drum as caused by said rotation of the drum.
Apparatus for the separation of solids and liquids from a suspension by screening, said apparatus comprising;
- a screening drum having a hollow interior and a screening wall which has a plurality of screening wires spaced apart in a parallel arrangement about the periphery of the drum and lying substantially axially along the drum, said wires being wedge shaped in cross section and being arranged in the drum wall with a broad face facing the interior of the drum, that is, with the wedge being directed radially outwardly from the drum;
- mounting means whereby said drum is mounted to be rotatable in one direction about its axis which lies in a substantially horizontal plane;
- driving means to rotate the drum;
- inlet means to introduce a flow of the suspension into the interior of the drum and to direct substantially all of this flow against an inner surface of the wall of the drum so that the flow of the suspension where it strikes the drum wall is in a direction opposing the direction of movement of the wall of the drum as caused by said rotation of the drum;
- and
- extracting means to extract solids from within the drum, the extracting means comprising a plurality of diverter blades attached to the inner surface of the drum and angled to deflect separated solids towards an outlet end of the drum on rotation of the drum in said one direction.
Apparatus for the separation of solids and liquids from a suspension by screening, said apparatus comprising:
- (a) a substantially horizontal screen drum having a hollow interior and open ends, the side walls of said drum comprising a plurality of elongated members in parallel arrangement and spaced apart about the periphery of the drum and lying substantially parallel to the axis of rotation thereof;
- (b) means to drive said drum in a single direction of rotation;
- and
- (c) means to introduce a flow of suspension materials along a substantial portion of the axial length of the interior of the drum and to direct substantially all of said flow countercurrent to the direction of rotation of the drum, so as to cause a shearing action by the elongated members against the incoming suspension.
A method for the separation of solids and liquids from a suspension by screening, said method comprising the steps of:
- rotating a screening drum in one direction about its axis which lies in a substantially horizontal plane, said drum having a hollow interior and a screening wall which has a plurality of screening wires spaced apart in a parallel arrangement about the periphery of the drum and lying substantially axially along the drum;
- introducing a flow of suspension into the drum;
- directing substantially all of the flow against an inner surface of the drum in a direction opposing the direction of movement of the wall of the drum as caused by said rotation of the drum;
- and
- extracting screened solids from within the drum.
Apparatus for the separation of solids and liquids from a suspension by screening, said apparatus comprising:
- (a) a substantially horizontal screen drum having a hollow interior and open ends, the side walls of said drum comprising a plurality of elongated members in parallel arrangement and spaced apart about the periphery of the drum and lying substantially parallel to the axis of rotation thereof;
- (b) means to drive said drum in a single direction of rotation;
- and
- (c) means to introduce a flow of suspension materials by gravity along a substantial portion of the axial length of the interior of the drum and to direct substantially all of said flow countercurrent to the direction of rotation of the drum, so as to cause a shearing action by the elongated members against the incoming suspension.
Dependencies are inferred from the claim text.