Method and means for pressure filtering

Details Method and means for pressure filtering Method and means for pressure filtering

1989-01-06

1990-02-13

Nozick, Bernard

Liquid purification or separation

Processes

Separating

210225, 210230, B01D 3700

Patent

active

049004549

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a method and means for pressure filtering.
The invention especially relates to the solution of the problem to loosen and discharge the filter cake as well as the washing and cleaning of the filter cloths such a filter.
There are previously known pressure filters, for instance shown German Patent Publication 3.341.636 and 3.527.735, in which the suspension means of the filter cloths in both cases are suspended from the press plates of the pressure filter by protruding, hinged brackets and springs, while the lower ends of the filter cloths are substantially rigidly affixed to the press plates. The filter cloths are vibrated by means of a travelling vibration device, which is acting directly on the suspension rods of the filter cloths. In these previously known devices the filter chambers of the pressure filter are discharged one at a time, which results in very long discharge and cleaning times. Especially during short cycle times and great filter cake capacity this results in uneconomically and unreasonably long discharge times for such a pressure filter. The fixation of the filter cloths in the lower part of the press plates also results in severe strains and increased wear of the filter cloths.
As shown in German Patent Publication 3.527.735 there is also known a pressure filter with a travelling, vertically movable cleaning device, which is cleaning the filter cloths in one filter chamber at a time. This also results in very long cycle times for the filter cloth cleaning operation.
French Patent No. 1.335.850 describes a pressure filter comprising weights at the lower edge of the filter cloths for the tension thereof. However, this filter does not comprise any means for the vibration of the filter cloths. Furthermore, also in this case the cake discharge is effected one filter chamber at a time, which results in the disadvantageous long cycle times mentioned above.
In order to overcome these problems of the Prior Art, a pressure filter has been developed, which is able to discharge the filter cakes in all the filter chambers at the same time and also is able to flush and clean all the filter cloths at the same time. This means of course a considerable improvement compared to the old technique, however, especially for short cycle times and great filter cake capacity, the time used for cake discharge and filter cloth cleaning remains a problem.
In order to elucidate this previously known pressure filter and the drawbacks and disadvantages thereof reference is made to "Book of Instruction Manual for Kurita Automatic Filter Press, KUF-10", September 1983, published by Sala International AB, Sala, and to the appended FIGS. 1-3, which during various process stages discloses a section of such a filter press, in which section irrelevant components are excluded.
Such a previously known pressure filter comprises a frame 2, (not shown) a stationary end or head plate 3, a movable end or head plate (not shown in FIGS. 1-3), as well as press plates 5, 6 arranged therebetween. At least every second press plate 5 is provided with a membrane 7 on at least one side thereof. Through a supply conduit F the underside of said membrane can be supplied with a pressurized medium, for instance a hydraulic liquid or pressurized air. Between themselves the press plates 5, 6 and/or the end plates are in pairs forming pressure chambers 8. In each pressure chamber 8 there are arranged two filter cloths 9. Outside the filter cloths, the walls of the pressure chambers exhibit drain channels 10 arranged in the plates 3-6 and the membrane 7 respectively, said channels through conduits 12 being connected to holes passing through the plates. Also between the press plate 5 and the membrane 7 there are arranged distribution channels 16 corresponding to the drain channels 10 for said pressurized medium. Some of the holes connect with conduits B, E for separated liquid, while other conduits C, D serve both as outlet for separated liquid and as inlet for pressurized gas, as will be explained in detail below.
The

REFERENCES:
"Book of Instruction Manual for Kurita Automatic Filter Press, KUF-10", Sep. 1983, Publ. Sala International AB, FIGS. 1-3.

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