Liquid purification or separation – Processes – Separating
Patent
1995-05-19
1998-03-10
Popovics, Robert J.
Liquid purification or separation
Processes
Separating
210783, 210350, 210400, 210401, 162 56, 162210, 162308, 162313, 198819, 198839, 100118, 100120, B01D 3700, B30B 924
Patent
active
057257833
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to methods for concentrating a liquid suspension of solid particles, particularly fibers, by screening the suspension. More particularly, the present invention also relates to apparatus for concentrating such liquid suspensions by screening same.
BACKGROUND OF THE INVENTION
It has been suggested in the past to concentrate liquid-particle suspensions, such as to de-water highly diluted paper pulp suspensions, by passing the suspensions through stationary, perforated screening cylinders that are comprised of a relatively soft, flexible and perforated material. The liquid present in the suspension can thus pass through the walls of the screening cylinders while the concentrate exits from or is discharged through one end of the respective screening cylinders. In the case of concentrates having a high dry solids content, significant frictional forces may be generated between the cylinder wall and the concentrate, rendering it difficult to discharge the concentrate.
The object of the present invention is thus to provide a novel method and a novel apparatus with which the aforesaid difficulties can now be avoided.
SUMMARY OF THE INVENTION
In accordance with the present invention, these and other objects have now been realized by the discovery of a method for concentrating a liquid suspension of solid particles comprising providing a screening web moving in an endless path, folding the screening web into a tubular configuration at a first location along the endless path, unfolding the screening web from the tubular configuration at a second location along the endless path, introducing this liquid suspension into the tubular configuration of the screening web proximate to the first location whereby the liquid can pass outwardly through the tubular configuration of the screening web and a concentrate of the solid particles can be formed therein, and removing the concentrate from the screening web proximate to the second location. In accordance with one embodiment, the solids particles comprise fibers.
In accordance with another embodiment of the method of the present invention, the method includes moving the screening web continuously in the endless path. In another embodiment, however, the method comprises moving the screening web intermittently in the endless path.
In accordance with another embodiment of the method of the present invention, the method includes passing the tubular configuration of the screening web through a tubular perforated support tube at a support location downstream of the first location.
In accordance with another embodiment of the method of the present invention, the method includes passing the tubular configuration of the screening web around a driven roller so as to drive the screening web along the endless path. In a preferred embodiment, the driven roller has a first diameter and the tubular configuration of the screening web has a second diameter, with the first diameter being greater than the second diameter.
In accordance with another embodiment of the method of the present invention, the method includes passing the tubular configuration of the screening web around a driven roller so as to drive the screening web along the endless path at a location downstream of the support location. In accordance with this embodiment, the method includes pressing the tubular configuration of the screening web against the driven roller. Preferably, this is carried out by means of at least one pressure roller.
In accordance with another embodiment of the method of the present invention, the method includes providing a secondary web of highly liquid permeable material and folding the secondary web into a tubular configuration within the tubular configuration of the screening web. Preferably, this method includes removing the concentrate from the screening web proximate to the second location by encasing the concentrate in the secondary web.
In accordance with a preferred embodiment to the method of the present invention, the method includes
REFERENCES:
patent: 2796810 (1957-06-01), Muller
patent: 3338383 (1967-08-01), Hashimoto
patent: 4017398 (1977-04-01), Hartmann et al.
patent: 4039450 (1977-08-01), Brown
patent: 5520824 (1996-05-01), Sasaki
Popovics Robert J.
Sunds Defibrator Industries Aktiebolag
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