Liquid purification or separation – Filter – With residue removing means or agitation of liquid
Patent
1984-11-13
1986-11-25
Miles, Tim
Liquid purification or separation
Filter
With residue removing means or agitation of liquid
210415, B01D 2502
Patent
active
046247866
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for separating the liquid portion from the solid portion of a ceramic slip, having a worm provided in a cylindrical housing, driven and surrounded by a filter, and further having a means for supplying slip at one end of the housing and a narrow solid discharge located on the worm axis at the other end of the housing.
Such an apparatus is described, for example, in "International Chemical Engineering" (Vol. 18, No. 4) page 680 to 688 (Japan). In this apparatus, the filter cake which is deposited on the filter is carried along by a conveyor worm to the solid discharge. The filter cake slides along in the form of a blocking flow on the filter. This filter cake constitutes considerable flow resistance for the filtrate outflow. The filter in this apparatus comprises a perforated cylinder which is surrounded by a tube made of filter cloth. Filter cake accumulates additionally in the holes of the perforated cylinder, further increasing the flow resistance for the filtrate outflow. Thus, the filtrate outflow is relatively low in this apparatus. The filter tube is not supported from the outside, so that it is not capable of accommodating higher inside pressure.
Further apparatus of this or a similar design are described, for example, in German Auslegeschrift No. 12 55 084, German Auslegeschrift No. 12 19 444, German Offenlegungsschrift No. 14 61 417 and German Utility Model print No. 18 23 332.
The problem on which the invention is based is to improve such an apparatus in such a way that a filter cake is prevented from accumulating on the filter virtually completely, so that the filtrate outflow is increased. Further, the build-up of high pressure within the apparatus should be possible and thus the concentration of the solid concentrate also increased.
This problem is solved by the invention for the apparatus characterized at the outset in that the filter is inserted so as to be secured against rotation in a massive case forming the cylindrical housing, thereby forming a worm channel with a flat or smooth design, this case being provided on its surface facing the filter with a plurality of spaced peripheral grooves which open out into a filtrate outflow, and in that the surface of the filter facing the worm is covered by an abrasion-pooof, sufficiently wide-meshed screen. This screen also improves, in particular, the conveying effect and the build-up of pressure in the worm channel.
Thus, what is essential to the inventive apparatus is a worm channel with a flat design in which the ceramic slip, or a similar matter, is circulated so greatly by the relative movement between the worm and the worm cylinder that the liquid concentration is approximately constant across the cross-section of the worm channel, at least in the last section of the mouthpiece, and the liquid slip thus cannot filter through at the root of the worm up to the mouthpiece.
It has been shown in experiments that an increase in the speed of the worm, and thus of the mixing processes in the worm channel, considerably increased the efficiency of the filter worm press.
Such an apparatus further has the advantage that it is possible to apply high feeding pressure for the slip and to build up high pressure due to the worm rotating inside the filter cylinder. The filter aid forming the casing of the worm channel is thereby additionally supported by the cylindrical housing consisting of a massive casing. The corresponding discharge grooves or channels for the filtrate may be provided in the casing without any difficulty and without any essential weakening of the supporting effect.
In a further embodiment of the invention, highly porous solids such as screen netting, for example, which additionally support the filter, may be provided in the peripheral grooves for the filtrate outflow, these solids offering only slight resistance to the filtrate flow.
If a fine-pore sintered metal cylinder is used as a filter, in a further embodiment of the invention, grooves preferably interrupted at intervals may be provided i
REFERENCES:
patent: 1769658 (1930-07-01), Veenhuyzen
patent: 1772262 (1930-08-01), Naugle
patent: 1993214 (1935-03-01), Hass
patent: 2565947 (1951-08-01), Burghauser
patent: 2877903 (1959-03-01), Veres
patent: 3016345 (1962-01-01), Price
patent: 3093579 (1963-06-01), Schmidt
patent: 4186100 (1980-01-01), Mott
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