Liquid purification or separation – Processes – Separating
Patent
1988-11-21
1990-08-07
Fisher, Richard V.
Liquid purification or separation
Processes
Separating
210384, 210393, 210394, 210408, 134 1, 134 2214, B01D 3324
Patent
active
049466020
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a method in a suction dryer which comprises a basin for the suspension to be suction-dried, in connection with which basin one or several disc-shaped components revolve, which consist of filter plates, onto the faces of which a filtrate cake is gathered and dewatered by the effect of a suction flow passing through the filter plates, the filtrate cake/cakes being scraped or otherwise detached from the face or faces of the filter plates.
In the prior art, various suction dryers are known which comprise filter discs composed of finely porous filter plates. The discs are rotated in the suspension to be dewatered, and by the effect of suction, a filtered cake is gathered on the plane faces of the filter plates, which cake is scraped off the faces of the filter plates.
With respect to recent developments of the suction dryers concerned, reference is made to the applicant's earlier Finnish Patent Applications Nos. 870706, 870707, and 871312, reference being made to the constructional details described in the applications.
The usually ceramic filter plates have a tendency to be blocked, because their pore structure is successively filled with finely divided material. In a way known in prior art, attempts have been made to clean the filter plates by passing cleaning liquid through the same in the direction opposite to the circulation of the liquid to be removed, said cleaning liquid usually consisting of water. Moreover, various brush devices have been used for outside cleaning of filter plates.
However, with these prior-art methods and devices, it has not been possible to retain the permeability of the filter plates for a sufficiently long period of time. Instead it has been necessary to replace the filter plates unnecessarily frequently, in relation to their durability in other respects, which increases the filter costs substantially and causes standstills in the process.
SUMMARY OF THE INVENTION
The general object of the present invention is to provide improvements in the drawbacks discussed above.
A particular object of the present invention is to provide such a method for the cleaning of suction filter plates wherein no substantial alterations have to be made to the suction filter device itself and which cleaning method can be used smoothly when required, at suitable intervals, so that the natural functions and embodiments of equipment of the suction dryer can be utilized efficiently in the cleaning.
With the above objects in view the method in accordance with the invention is mainly characterized in filter plates, an ultrasonic detector or detectors are provided in connection with the basin for the suspension to be filtered, to which detectors an electric power of ultrasonic frequency is fed out from an ultrasonic generator, basin is filled with a connecting and cleaning liquid, preferably water, and means of the same equipment by means of which the rotating of the filter-plate discs takes place in connection with the suction drying.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following, the invention will be described in detail with reference to an exemplifying embodiment of the invention illustrated in the figures in the accompanying drawing, to whose details the invention is by no means strictly confined.
FIG. 1 is a schematic side view of a suction dryer arranged to be cleaned by means of the method in accordance with the invention.
FIG. 2 shows the same suction dryer of FIG. 1, viewed from the end of the same.
DESCRIPTION OF PREFERRED EMBODIMENTS
The suction dryer 10 shown in FIGS. 1 and 2 comprises a frame part 11 and a suspension basin 12 arranged on the frame, the suspension to be dewatered, such as dressed metal ore, peat suspension, or equivalent, being passed into said basin. A horizontal shaft 13 is fitted so as to revolve on the frame part 11, said shaft being driven by a motor M by the intermediate of a worm gear 18. To the shaft 13, filter discs 14 in a vertical plane are fixedly mounted, said discs being provided with ceramic filter pla
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Ekberg Bjarne
Norrgard Goran
Fisher Richard V.
Nessler Cynthia L.
Valmet Paper Machiney Inc.
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