Liquid purification or separation – Processes – Separating
Patent
1988-07-08
1990-12-04
Fisher, Richard V.
Liquid purification or separation
Processes
Separating
210791, 210349, 210383, 210396, 210411, 210414, 210415, 162 56, 162380, B01D 2962, B01D 3346
Patent
active
049752049
ABSTRACT:
The present invention relates to a method and apparatus for the continuous discharge of water from suspension, especially from fibrous pulp, whereby pulp is caused to thicken without having the water to be removed through a thick uncontrollably gathered fiber mat.
In accordance with the invention the suspension to be thickened is fed into a filtering chamber, the suspension is formed as a layer that is continuously being mixed for equalizing the consistency differences, the liquid is continuously removed from the suspension and the thickness of the fiber mat being formed on the filter surface is controlled by subjecting said mat to shear stresses.
The above described method is realized by an apparatus, in which at least one of the co-operating surfaces, the filtering surface (8) and its counter surface (10), is provided with means (12) for non-mechanically limiting the thickness of a fiber mat on the filtering surface, whereby a uncontrolled formation of a fiber mat on the filtering surface (8) is prevented.
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Henricson Kaj O.
Makela Mika P.
Niskanen Toivo
Pikka Olavi E.
Vikman Vesa
A. Ahlstrom Corporation
Fisher Richard V.
Upton Christopher
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