Filtering case for separating a liquid from a solid, in particul

Details Filtering case for separating a liquid from a solid, in particul Filtering case for separating a liquid from a solid, in particul

1986-12-18

1987-12-22

Sever, Frank

Liquid purification or separation

Sectional chamber press type

100127, 210350, B01D 3300, B01D 3528

Patent

active

047145498

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention has for its subject a filtering case having rigid filter-forming walls for separating a liquid from a solid, in particular for dehydrating slurries from industrial processes.
To conveniently handle such slurries, specifically to make their transportation and disposal easier and more economical, it is necessary that their relative humidity be reduced as far as possible.


BACKGROUND ART

It is known to separate the solid component of slurries or sewage from the liquid by means of filtering cases, with a filter cloth across their walls, wherein the solid is separated from the liquid by gravity. A case of this kind is disclosed, for example, in Italian patent application 21480-B/84.
Dehydration by gravity filtration, which takes place along with natural evaporation of the water contained in a slurry being processed, requires, however, a fairly long time. As an example, in cold damp weather, processing time and/or the attainable results may be unsatisfactory.
To shorten the dehydration time, it has been thought of subjecting a slurry being processed to a pressure, by superimposing a number of cases on one another.
However, that approach has shown to be hardly practicable or even wholly unpracticable because the pressure on the slurry, due to the weight of the stacked cases, reduces itself at most to few marginal areas, to merely produce, if any, a slightly increased initial dehydration, or to concentrate over a central area of the cases, placed the one within another, producing slurry leakage past the case peripheral rims.
Dehydration time has been successfully reduced by stacking together filtering cases having flexible walls, such as filter bags.
In this instance, the effect of stacked bags is that an improved distribution of pressure is brought about, and hence, a higher rate of slurry dehydration without causing it to leak out or drop out.
Flexible wall cases require, however, some auxiliary means of supporting them in the stacked arrangement, and are more difficult to manipulate and handle.
The problem underlying the present invention is to provide a filter case of the rigid type which affords a faster rate of dehydration of civil and industrial slurries, while obviating all the drawbacks which affect the cited prior art.


DISCLOSURE OF INVENTION

This problem is solved by the invention through a filtering case of the aforesaid type being characterized in that it comprises two superimposed parts, respectively an upper one and a lower one being movable the one relatively to the other, the upper part bounding a slurry receiver chamber and having a bottom wall wherethrough an opening is formed, the lower part being guided through said opening between a first position outside said chamber and a second position at least in part inserted into said chamber.
Thus, in a case of this type, the lower part will act as a plunger in relation to the contents of the upper part which bears with its weight and the overlying one on the lower part through the intervening body of a slurry to be dehydrated.
Advantageously, the lower part would be configured as a drum and have side walls which form filtering surfaces.
Thus, the overall filtering surface area of the case is made to increase as the lower part penetrates the slurry receiver chamber.
In a preferred embodiment of this invention, the case walls are of mesh, metal grid, or perforated sheet metal construction, and the slurries collect in a filter bag or cloth placed within the slurry receiver chamber. The size of the opening through the bottom wall of the upper part is selected to make the filter bag or cloth to take, in the gap between the upper and lower parts, a pocket-like conformation as the relative movement of the two parts proceeds, to contribute its filtering action without hindering the relative movement of the parts. The arrangement of the cloth inside the upper part of the case in the course of the dehydration process is such as to prevent spillage of slurry or sewage despite the pressure from the lower part being app

REFERENCES:
patent: 651805 (1900-06-01), Kempf
patent: 2800072 (1957-07-01), Vandenburgh
patent: 3410202 (1968-11-01), Chrubasik
patent: 4019984 (1977-04-01), Mohm

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