Liquid purification or separation – Filter – Supported – shaped or superimposed formed mediums
Patent
1986-02-25
1987-10-13
Sever, Frank
Liquid purification or separation
Filter
Supported, shaped or superimposed formed mediums
210542, B01D 3326
Patent
active
046997164
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns variable-thickness sectors which are intended to form a disc for a rotary filter which may comprise a plurality of discs.
2. Discussion of Background
It has long been known for a continuous, liquid or gaseous phase and a dispersed, solid or liquid phase, initially forming a suspension resulting for example from an operation of attacking an ore, to be separated by filtration.
For that purpose, the suspension is passed over a support such as a grid, cloth, membrane, etc. on which the solid particles are deposited, forming a cake of variable thickness, while the liquid phase constituting the filtrate passes through the filtration texture and is then collected by any collecting means.
Depending on the characteristics of the suspension to be filtered such as for example their concentration of dry matter, the size of the solid materials, suitability for separation, aggressiveness of the medium and the degree of classification required, the man skilled in the art is required to choose a suitable piece of equipment, from the many technologies which are available on the market.
Among the filtration methods which are described in the specialist literature, one is used very frequently and considered to be of value in the field of separating liquid and solid phases of suspensions resulting from operations of attacking ores using hydrometallurgical processes: that filtration method involves using disc-type rotary filters such as those described for example in "Chemical Engineer's Handbook", page 978, by John H. PERRY, edition No 5, Graw Hill Book Company, 1950.
As described, the disc-type rotary filters comprise a plurality of discs which are fixed perpendicularly to a horizontal hollow shaft forming ducts in which various effects are produced such as suction, blowing etc. Each disc is formed by a plurality of independent sectors fitted with wire gauzes and/or textile filter bags, which are connected to the above-mentioned horizontal hollow shaft.
In the filtration operation, the discs provided with their sectors dip into a trough containing the suspension to be filtered, the solid phase being caused to cling to the filter cloths by suction while the separated liquid phase flows away in the collectors of the horizontal shaft which is provided with at least one distributor, by means of connections existing between each sector and the shaft itself. The solid phase which is disposed on the filter cloth is then drained off when it passes into the free air and then removed by blowing air in counter-flow relationship through the filter surfaces.
Now, it is well known that each rotary disc is formed by sectors, each of which consists of a rigid frame which imparts its shape to the sector, the frame containing the filter cloth support and a member for connection to the hollow collecting and drive shaft.
In accordance with the known art, the filtration cloth support is generally formed by performed metal materials such as for example flat or corrugated perforated sheet metal in order to have the minimum contact with the filter cloth. The two cloth supports which face is provided with a cloth support. The two cloth supports which are fitted into the frame of the sector are maintained at a constant spacing from each other by bracing members which fix the internal thickness of the sector, said thickness being defined by the amount of liquid phase to be discharged by way of the base of the sector, that is to say, close to the shaft, at the location where the sector is of smallest width. In other cases, the two filtration cloth supports and the bracing members which connect them may comprise for example a single corrugated sheet, the height of corrugation thereof constituting the internal thickness of the sector which is required for the discharge flow of liquid phase.
Thus, in the prior art, the thickness of a sector is constant from its periphery to the end which is in the vicinity of the shaft.
However, such constant-thickness sectors suffer from the ma
REFERENCES:
patent: 3438505 (1969-04-01), Luthi
Aluminium Pechiney
Sever Frank
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