Liquid purification or separation – Processes – Separating
Patent
1992-01-22
1993-06-29
Lithgow, Thomas M.
Liquid purification or separation
Processes
Separating
210785, 210798, 210388, 210393, 2105101, B01D 2968, B01D 2972, B01D 3348, B01D 3354
Patent
active
052231550
ABSTRACT:
An improvement is disclosed which is applicable to the method for filtering an aqueous mineral slurry by flowing the slurry through a ceramic filter plate which is characterized by a porous support layer and an overlying porous filtration layer, the pore sizes in said filtration layer being in the range of from about 1 to 3 .mu.m, and the flow through the filter plate being from the filter layer side toward the base layer, and being effected by establishing a fluid pressure differential across the said filter plate by applying suction to the the porous support layer. The improvement facilitates effective discharge of the filter cake from the plate which accumulates upon the porous filtration layer. According to such improvement the suction is extinguished and the support layer side of the plate is subjected to one ore more positive water pressure pulses to effect a transient reverse flow through the plate. Via the uniform pore structure this generates a uniform back pressure and a lubricating film of water at the interface between the filtration layer and the filter cake. Oscillations or vibrations are applied to the surface of the porous filtration layer to facilitate separation of the filter cake.
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Broxton Lawrence E.
Cobb Gary L.
Ginn Michael W.
McNeely Kelly R.
ECC International Inc.
Lithgow Thomas M.
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