WO2018224806A1 - Système d'ouverture de chambre et de décharge de gâteau pour un filtre-presse - Google Patents

Système d'ouverture de chambre et de décharge de gâteau pour un filtre-presse Download PDF

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Publication number
WO2018224806A1
WO2018224806A1 PCT/GB2018/051464 GB2018051464W WO2018224806A1 WO 2018224806 A1 WO2018224806 A1 WO 2018224806A1 GB 2018051464 W GB2018051464 W GB 2018051464W WO 2018224806 A1 WO2018224806 A1 WO 2018224806A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
discharge system
cake
chamber opening
cake discharge
Prior art date
Application number
PCT/GB2018/051464
Other languages
English (en)
Inventor
Herbert Marshall Heaton
Original Assignee
Kinder Enterprises Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kinder Enterprises Limited filed Critical Kinder Enterprises Limited
Publication of WO2018224806A1 publication Critical patent/WO2018224806A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/12—Filter presses, i.e. of the plate or plate and frame type
    • B01D25/164—Chamber-plate presses, i.e. the sides of the filtering elements being clamped between two successive filtering plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/12—Filter presses, i.e. of the plate or plate and frame type
    • B01D25/127—Filter presses, i.e. of the plate or plate and frame type with one or more movable filter bands arranged to be clamped between the press plates or between a plate and a frame during filtration, e.g. zigzag endless filter bands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/12—Filter presses, i.e. of the plate or plate and frame type
    • B01D25/172—Plate spreading means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/12—Filter presses, i.e. of the plate or plate and frame type
    • B01D25/21—Plate and frame presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/32—Removal of the filter cakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/32—Removal of the filter cakes
    • B01D25/322—Removal of the filter cakes specially for chamber filter presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/32—Removal of the filter cakes
    • B01D25/38—Removal of the filter cakes by moving parts, e.g. scrapers, contacting stationary filter elements sprayers

Definitions

  • This invention relates to a filter press for filtering suspensions or slurries.
  • this invention relates to a filter press which includes a combined chamber opening and cake discharge system. This invention enables the batch filtration of liquids from solids, or vice versa, to be carried out more effectively and efficiently.
  • An industrial filter press is a tool used in separation processes, specifically in separating liquids from solids, or vice versa, using the principle of a pressure drive from a slurry pump. It has been the workhorse for filtering suspensions for over 150 years, partly because of the relatively dry solids achievable, and which are usually formed as a filter cake by the substances/solids that are retained on a filter medium.
  • Such a filter press is generally comprised of a plurality of chambers formed between vertically-oriented filter plates.
  • the filter plates being moveable towards and away from each other in response to the action of a pressure drive.
  • Each filter plate having at least one filtering chamber, and which is kept closed during filtration, usually by hydraulic forces, against the internal pressure from the slurry pump.
  • a filter medium (cloth) is placed over the drainage surface on each side of the filter plate and which allows the filtrate to pass through the medium, whilst retaining the solids which form the filter cake in each chamber.
  • Such a filter press being operated as a batch process having a number of operating steps, namely: close, feed, filter, open, discharge and other optional steps, as detailed below.
  • the first step of the batch filtering process involves clamping the filter plates together to form a series of filtering chambers using a high-pressure hydraulic drive to prevent leaking during the dewatering (filtering) cycle. After the abutted plates are clamped together, a feed inlet is formed by the successive arrangement of apertures disposed in the clamped plates. A suspension or slurry can be pumped through the feed inlet and between the two filter cloths forming each chamber, and the flow continues until the chambers are full.
  • Filtrate passes through the filter cloth and exits the press through one or more filtrate ports in the successive filter plates, leaving behind a filter cake between the two filter cloths forming each chamber.
  • the filter cake being perhaps 30% dry solids, adheres to the cloth in varying degrees, depending on the nature of the solids formed, and on the nature of the filter cloth.
  • the press is then opened and the cake discharged from the filter cloths, which are generally suspended from above. As each chamber opens, the weight of the filter cake allows the cake to discharge from the surface of the cloth in a shear movement.
  • the present invention provides a filter press which includes an improved combined chamber opening and cake discharge system which allows for the opening of chambers either singularly or in multiples thereof, and whilst simultaneously discharging the cake fully and reliably from each chamber.
  • the operation of such combined chamber opening and cake discharge system enabling a truly automatic filter press, requiring no operator assistance to remove the filter cake from the cloth, even with thin cakes.
  • the use of thin cakes enables the possibility of a filter press process with fast cycle times and fewer plates, but which equals the output of conventional filter presses, and thus saving capital expenditure and labour costs.
  • It is a further object of the present invention to provide a chamber opening system which can be used in isolation from the cake discharge system, and for a cake discharge system which can be used in isolation from the chamber opening system, and which each enable efficiency improvements.
  • a combined chamber opening and cake discharge system for a filter press comprising:
  • a press frame having a moveable pressure plate being moveably positioned towards one end thereof and a fixed plate arranged towards the opposite end thereof; a plurality of vertically oriented filter plates being mounted in the press frame and positioned between the moveable pressure plate and the fixed plate, the filter plates being capable of horizontal movement towards and away from each other in response to the pressure plate, each filter plate forming at least one filtering chamber closed off by a filter medium;
  • the combined chamber opening and cake discharge system comprises a plurality of carriages each being in contact with and adapted to traverse the filter medium to discharge a filter cake retained thereon, and wherein each of the plurality of carriages abuts an adjacent carriage such that when the respective carriages traverse the filter medium the respective filter plates are moved away from each other and the filtering chamber is opened simultaneously.
  • An advantage of the present invention is that the filtering chambers of the press can be opened quickly and automatically, whilst simultaneously discharging the cake fully and reliably from each chamber and thereby negating the need for a back-up cake discharge mechanism to discharge any residual cake and/or avoid further manual work.
  • the filter medium is an unrestrained filter cloth.
  • the filter cloth is hung over the top of the filter plate either by cloth pegs and/or over a spring held bar or the like to tension the filter cloth, and held at the bottom thereof.
  • each of the plurality of filter plates may comprise:
  • a plate-like body portion having a first face and an opposite second face
  • the first face and/or the second face is generally planar.
  • first face and the second face are planar and parallel to each other.
  • each of the plurality of filter plates may be rigid and formed from polypropylene or other rigid material.
  • each of the plurality of filter plates further comprises:
  • each of the plurality of carriages further comprises:
  • dislodging means acting upon at least part of the filter medium to discharge the filter cake thereon; and a pair of side walls which extend inwardly from each side of the dislodging means, and wherein the pair of side walls being tapered to form end walls at each end thereof.
  • the dislodging means may further comprise:
  • one or more peeler rollers being disposed between the pair of side walls; and at least one scraper bar being disposed between the pair of side walls.
  • the ends of the one or more peeler rollers are retained in slotted apertures disposed in the pair of side walls.
  • the number of peeler rollers is two and being disposed at either side of the scraper bar.
  • the outer surface of the filter medium may pass over the one or more peeler rollers and underneath the scraper bar when the carriage is positioned co-planar with the first face and/or the second face of the filter plate.
  • the pair of side walls each being configured having chamfered edges which originate from the end walls.
  • the at least one scraper bar has a forward slanting edge to discharge the filter cake retained on the filter medium.
  • the one or more supplementary peeler rollers may be disposed between the pair of side walls.
  • the one or more supplementary peeler rollers is selected from the group consisting, but not limited to, any one of the following: nailed or rough surface roller, vibrator roller, and/or a blower roller etc.
  • the combined chamber opening and cake discharge system further comprising a bowed roller disposed on the carriage to prevent creasing of the filter medium.
  • a locating pin may be disposed in the side walls of each of the carriages which meets with a slot in the lateral side edges of the respective filter plate to retain the carriage in close contact with the filter plate as it traverses the filter medium.
  • each filter plate comprises a carriage on each of the first face and second faces.
  • the filter plates are closed together by the action of the pressure plate before a filtering part of the cycle, the carriages are housed in a parking position formed in the top extension piece.
  • the carriages may be driven downwards from the parking position they part one filter plate from its neighbouring filter plate thereby opening the filtering chamber.
  • the opening of the filtering chamber and discharging the filter cake are combined in one movement of the respective pair of carriages.
  • the movement of the respective pair of carriages can open individual filtering chambers and/or the plurality of carriages may be linked together and so driven together down to part all of the filter plates and thereby opening all of the filtering chambers and discharging all of filter cakes simultaneously.
  • the opening of the filtering chamber may occur separately from discharging the filter cake.
  • a releasable cloth lock is positioned around the inlet for feeding suspension into each of the filtering chambers on each side thereof, and being configured such that cloth lock is released when the filtering chamber is opened thus allowing the filter cloth to be unrestrained and the carriages, peeler rollers and follower bar and the like to pass down the filter plate without hindrance.
  • the releasable cloth lock being formed as pair of complementary shaped annular members each having mating faces which in use are situated either side of the inlet.
  • the first annular member may include a plurality of apertures disposed around its periphery, and which receive a respective plurality of spacer rods disposed on the second annular member, or vice versa.
  • the length of the spacer rods is such that the distance between the outer faces of the annular members is equal to the thickness of the filtering chamber.
  • the combined chamber opening and cake discharge system further comprising a locating frame that holds the cloth lock in position adjacent to the inlet.
  • the locating frame may be capable of horizontal movement towards and away from the filter medium by the use of a handle.
  • the combined chamber opening and cake discharge system can be installed with new filter presses or retrofitted to existing filter presses.
  • a combined chamber opening and cake discharge system for a filter press comprising:
  • a moveable carriage which traverses a filter medium closing off a filtering chamber, the carriage having an abutment surface being adapted to contact the abutment surface of a neighbouring carriage for opening the filtering chamber, and on the opposite surface thereof having dislodging means for discharging the filter cake from the filter medium.
  • each carriage having an abutment surface being adapted to contact the abutment surface of a neighbouring carriage for opening the filtering chamber, and on the opposite surface thereof having dislodging means for discharging the filter cake from the filter medium;
  • Figures 1 to 3 are exploded side elevation views of the successive pairs of filter plates of a filter press and showing the combined chamber opening and cake discharge carriage according to the present invention
  • Figures 4 and 5 show exploded side elevation and plan views, respectively, of the carriage according to the present invention
  • Figures 6 and 7 show exploded side elevation and plan views, respectively, of a second embodiment of the present invention and which illustrates an alternative approach for a cake discharge system with an additional peeler roll and follower/scraper bar;
  • Figures 8 to 12 illustrate how the present invention can be implemented with external corner feed filter presses;
  • Figures 13 to 16 illustrate how the present invention can be implemented with a holding/locating frame and cloth locks for centre and corner feed presses
  • Figures 17 and 18 are exploded side elevation views of successive filter plates of a filter press and show a third embodiment of the invention which depicts an alternative approach for a cake discharge system which discharges each side of the filter chamber separately;
  • Figures 19 to 21 show exploded side elevation views of the successive filter plates of a filter press with a centre feed cloth arrangement for discharging one side of each chamber;
  • Figures 22 and 23 show side plan and sectional views, respectively, of a centre feed cloth ring arrangement
  • Figures 24 and 25 show exploded plan side elevation views of the present invention implemented through further means of holding the centre feed clothlock in position.
  • the present invention has adopted the approach of using a filter press which includes an improved combined chamber opening and cake discharge system which allows for the opening of chambers either singularly or in multiples thereof, and whilst simultaneously discharging the cake fully and reliably from each chamber.
  • a filter press which includes an improved combined chamber opening and cake discharge system which allows for the opening of chambers either singularly or in multiples thereof, and whilst simultaneously discharging the cake fully and reliably from each chamber.
  • the operation of such combined chamber opening and cake discharge system enabling a truly automatic filter press, requiring no operator assistance to remove the filter cake from the cloth, even with thin cakes.
  • the use of thin cakes enables the possibility of a filter press process with fast cycle times and fewer plates, but which equals the output of conventional filter presses, and thus saving capital expenditure and labour costs as governed by the approximate formula: filtration rate is proportional to 1/cake thickness 2 .
  • the present invention provides a chamber opening system which can be used in isolation from the cake discharge system, and for a cake discharge system which can be used
  • the system 10 comprises a carriage or opener 12 having an abutment surface 13 which extends outwardly from each vertical face of a recessed filter plate 14.
  • the carriages 12 being joined together across the plate flange 22 by a follower or scraper bar 16 in conjunction with one or more peeler rollers 18 which abut against the filter cloth 24 when in use.
  • the follower bar 16 is rigidly fixed inside each carriage 12, and the peeler roller 18 runs in slotted apparatus 20 disposed in the side walls 15 of each carriage 12.
  • the carriage 12 is generally rectangular-shape in plan view (see Figure 5) with the generally flat abutment panel or surface 13 and a pair of side walls 15 which extend inwardly from each side of the abutment surface 13.
  • the pair of side walls 15 are tapered to form end walls 17 at each end of the abutment surface 13, such that the abutment surface 13, side walls 15 and end walls 17 in combination define a frame which is deep enough to receive the scraper bar 16 and peeler rollers 18, as perhaps best shown in Figures 4 and 5.
  • An identical carriage 12 configuration is positioned on the opposite side of each filter plate 14, on the opposite edge and flange 22 thereof.
  • the peeler roller 18 runs on the flange 22 of the plate 14 underneath the filter cloth 24, between the cloth 24 and the drainage surface 26 of the plate 14, whilst the follower bar 16, having a forward slanting edge 28 also runs on the flange 22 of the plate 14 but on the outer surface of the filter cloth 24.
  • Each filter plate 14 is fitted with a pair of carriages 12 as described above, on each side of the plate 14, and both pairs of carriages 12 are driven down the flange 22 on each side of the plate 14, and complete a full traverse of the flange 22, before reversing back to the top of the plate 14.
  • the carriages 12 complete with bars 16 and rollers 18 are housed in a parking position 30 which is formed by a top plate extension piece 32 affixed to the plate 14.
  • a parking position 30 which is formed by a top plate extension piece 32 affixed to the plate 14.
  • the carriages or openers 12 are driven downwards along the direction of arrow 34 in Figure 3, from the parking position 30, they part one plate 14 from its neighbouring plate 14, opening the chamber 44.
  • the opening sequence can be stepped or graduated by suitable design and shape of the carriage 12 and top plate extension piece 32, as shown in Figures 2 and 3.
  • one of the peeler rollers 18 is in advance of the follower bar 16, and as the carriages 12 are driven downwards 34, the peeler roller 18 lifts the filter cloth 24 and filter cake 36 from the drainage surface 26 to the top of the peeler roll 18.
  • the follower bar 16 holds and tensions the filter cloth 24 over the peeler roll 18, and as they both move between the carriages 12 and down the filter plate 14, the cake 36 can peel from the filter cloth 24, and any piece of the cake 36 which does not peel off the cloth 24 is scraped off by the follower bar 16.
  • Figures 1 and 3 also show that a second peeler roll 18 can be placed to follow the follower bar 16, so that on the reverse traverse, a repeat operation can take place. The traverses up and down the filter cloth 24 may be repeated, if found necessary.
  • Figures 1 to 3 illustrate this chamber opening and cake discharge sequence.
  • a pin 38 in the carrier 12 meets with a slot (not shown in Figures 1 to 5 for clarity reasons) in the side of the filter plate 14, or the skilled person will understand that an equivalent arrangement can be provided.
  • the filter cloth 24 is hung over the top 32 of the filter plate 14 by clothes pegs or the like (not shown in Figures 1 to 5), and tied at the bottom of the filter plate 14.
  • a plate extension piece 40 (as shown in Figure 13) at the bottom of the filter plate 14 may be needed to allow a full traverse and release of the filter cake 36.
  • FIG. 6 and 7 shows a second embodiment of the filter plate cake discharge system 10.
  • the construction of the second embodiment is very similar to that of the first embodiment and corresponding features have been given the same reference numerals.
  • the second embodiment differs from the first embodiment in that the scraper bar 56 is configured to work when driven downwards along the direction of arrow 34, as opposed to traversing up and down the filter cloth 24.
  • the second embodiment includes additional peeler rollers 42. Additional peeler rollers 42 can be added to the peeler roller 18 feed to assist in the release of the filter cake 36 from the filter cloth 24, e.g. they can comprise a nailed or rough surface roller, a vibrator roller, and/or a blower roll etc.
  • the above list is in no way intended to be limiting and exhaustive.
  • a bowed roll (not shown) can also be added to remove any creasing of the filter cloth 24, and to retain its position.
  • supplementary follower or scraper bars may be added, with different characteristics to assist cake 36 scraping if necessary.
  • One or more such sequences of such rollers and scraper bars can be provided as part of the system 10.
  • the system 10 can be adapted to open multiple chambers 44 at once, and discharge their filter cakes 36, and the carriages 12 which open individual chambers 44 may be linked together and so driven together down the filter plate flange 22 in one movement.
  • the number of chambers 44 which can be linked together is dependent on the length of stroke of the hydraulic (or other) cylinder press closing ram (not shown) and the space created when it retracts from the press close position to the press open position.
  • the skilled person will appreciate that the combined chamber opening and cake discharge system 10 of the present invention can be fitted with new filter presses or retrofitted to existing filter presses.
  • Filter presses that are already in use can be retrofitted with a single chamber opening and discharge system 10 or with a multi-chamber arrangement, and/or with a chamber opening system only operating and/or with the cake discharge system only operating.
  • the press skeleton will be largely unchanged, however, the existing plate movement mechanism is only needed when the cake discharge system 10 is operated independently.
  • the filter cloth 24 will need to be changed to a simple overhang type, as described above.
  • the cake discharge system 10 depends on the peeler roll 18 and the follower/scraper bar 16 being able to pass all the way down (and up) the filter cloth 24 from the top to the bottom of the plate 14 unhindered, such that the filter cloth 24 is unrestrained 70 when in use.
  • the slurry feed into the chamber 44 (as shown best in Figures 13 to 16) must be contained between the filter cloths 24 covering the drainage surface 26 on each side of the chamber 44, and not allowed to pass behind the filter cloth 24.
  • corner feed 48 presses usually employ a cloth locking union similar to that described above, because the feed hole 48 is too small to allow through a barrel of cloth.
  • Centre feeds 46 generally either use a barrelled filter cloth or a cloth locking union. In both methods, the cloth 24 is restrained at the feed 46, 48, as described.
  • a solution is for the filter cloth 24 to be held by a cloth lock 50 to the drainage surface 26 on either side of each chamber 44, rather than by a cloth locking union through and on either side of each plate 14, so that when the chamber 44 is open the cloth lock 50 is also released.
  • Figures 22 and 23 show side plan and sectional views, respectively, of a centre feed cloth ring arrangement 50 for use with the cake discharge system 10 of the present invention.
  • the releasable cloth lock arrangement 50 is a formed as a pair of complementary shaped annular members 50a, 50b each having mating faces 59 which in use are situated either side of the press feed 46, 48.
  • the first annular member 50a includes a plurality of apertures 58 disposed around its periphery, and which receive a respective plurality of spacer rods 60 disposed on the second annular member 50b, or vice versa.
  • the length of the spacer rods 60 is such that the distance between the outer faces 61 of the annular members 50a, 50b is equal to the cake thickness 36, as shown by dimension A in Figure 23.
  • the skilled person will appreciate that such an arrangement provides a high integrity seal when the chamber 44 is closed and as the chamber 44 is opened the cloth lock 50 is also automatically released. It follows that a simple hang over filter cloth 24 can be used.
  • FIGs 8 to 12 show detail of a holding/locating frame for use with corner feed filter presses according to the present invention.
  • these drawings show how the discharge system 10 of the present invention can be implemented in a top corner external feed press.
  • Figure 10 shows an exploded front view of the top corner of an individual filter plate 14, and shows that an external inlet channel is formed between the individual filter plates 14 when pressure applied and the press is closed.
  • the external inlet channel being formed by successive external eyes 62 that have been aligned plane parallel to each other and slurry feed channels 64 disposed in the filter plates 14.
  • the slurry is then conveyed into the chambers 44 formed by the filter cloth 24 via a slurry pump (not shown).
  • the filtrate passes through the filter cloth 24, and leaves the filter via internal and/or external outlet channels (not shown) and is conveyed further according to its intended usage.
  • the filtration process produces a dry filter cake 36 on the surface of the filter cloth 24.
  • Figures 8 and 12 show the press with the chambers 44 closed, and Figures 9 and 11 show the press with the chambers 44 open.
  • Figures 13 to 16 illustrate how the present invention can be implemented with a holding/locating frame and cloth locks for other types of centre and/or corner feed filter presses. These drawings show more general solution, which could include a centre feed 46 press, and utilise a holding/locating frame 52 that holds the cloth lock 50 in position when in use.
  • the filter plates 14 locate on a filter press sidebar 66 via filter plate handles 68 that are disposed at the lateral edges of the filter plates (as best shown in Figures 13 and 14). As described, the filter plates 14 able are pressed together by a hydraulic drive (not shown) between an open position (shown in Figure 15), and a closed position (shown in Figure 16).
  • the holding/locating frame 52 holds the cloth lock 50 adjacent to the centre feed 46 or corner feed 48 in position when in use.
  • the holding/locating frame 52 is also capable of horizontal movement towards and away from the unrestrained filter cloth 70 which overlies the filter plates 14 by the use of a cloth lock holding frame handle 72.
  • FIG. 17 and 18 shows a third embodiment of the cake discharge system 10.
  • the construction of the third embodiment is very similar to that of the first and second embodiments and corresponding features have been given the same reference numerals.
  • the third embodiment differs from the first and second embodiments in that it depicts an alternative approach for a cake discharge system 10 which discharges each side of the filter chamber 44.
  • the third embodiment includes a centre lock system for a centre feed 46 press having spring-loaded cloth holding/locating pegs which can be actuated in one of two configurations.
  • the pegs 74 can extend outwardly from the filter plate 14 into a circumferential opening 76 of the cloth lock 50 by the cake discharge system 10 (or other means) to free the filter cloth 24 and centre lock 50 whilst the cake discharge system 10 is passing down (and up) the filter plate 14. Furthermore, the pegs 74 can be retained inwardly in the filter plate 14 when the spring- loaded peg 32 is compressed as the chamber 44 is closed (as shown by reference numeral 78 in Figure 18). As the carriage 12 (not shown in Figures 17 and 18 for reasons of clarity) moves down (and up) it deflects the peg 74 against the spring bias, and pushes it fully in the filter plate 14 to the retracted position 78, as shown in Figure 18.
  • FIGs 19 to 21 illustrate further detail of a centre feed cloth lock arrangement 50 for discharging the filter cake 36 on each side of the filter chamber 44 separately.
  • Figure 20 showing the filter plates 14 being closed during the filtering part of the cycle, and Figures 19 and 21 show the press being opened to allow the cake to be discharged from the filter cloth 24.
  • Figure 19 shows that each of the cloth locks 50 can be selectivity retained on the surface of each filter plate 14 to allow the cake 36 on the opposite filter plate 14 to be discharged.
  • Figure 19 shows the cloth lock 50 being firstly retained on the left-hand plate 14a via engaging member 80 to allow the cake 36 to be discharged from the right-hand plate 14b.
  • Figures 24 and 25 show exploded plan side elevation views of how the present invention can be implemented through a further means of holding the centre feed clothlock in position, whilst enabling the filter cloth 24 to be unrestrained when the filtercake discharge system 10 passes down the chamber.
  • As the carriers 12 move down to open each chamber, each half of the cloth lock is released from the cloth, and by suitable design of flexible connections, stay in position horizontally with respect to the centre feed, and allows the cake discharge system to pass down the unrestrained cloth. And similarly on the reverse traverse.
  • Suitable guides on the ends of parts 60 of the centrefeed cloth lock locate it accurately as the filter press closes. Brushes on the open side of the follower plate may be added to clean and residual filter cake from the centre feed lock as they pass by.
  • the system 10 described herein can be for a single chamber 44 or multi-chamber operation.
  • the filter cake discharge system 10 described herein is such that even very thin filter cakes 36 are dischargeable, down to the thicknesses of 6mm or even less.
  • Thin filter cakes 36 make possible: filter cakes with higher dry solids content;
  • the equivalent total dry solids output can be obtained, for example from the following presses: a conventional recess chamber filter press with 25mm cake and 50 chambers; or a thin cake recess chamber plate filter press with 6mm cake and 15 chambers; or a thin cake membrane recess chamber plate filter press with 6mm cake and 11 chambers.
  • a thin cake filter press for use on minerals and in the mining industry, processing tailings and mineral concentrates is in existence.
  • the process requires a system for weighing the whole filter press after discharge, in order to notify that all cake 36 is discharged, and if not a further vibration of the filter cloths 24 following a further weighing of the filter press is required.
  • a membrane press comprising a plurality of recessed membrane plates alternating with flat conventional plates, provides an advantageous configuration as a thin cake or as a conventional cake thickness press.
  • the filter cake 36 in a single sided membrane chamber tends to adhere to the fixed or rigid side of the chamber for obvious reasons, and if this rigid side is a conventional flat plate with no recess, the whole process of chamber opening and cake discharge is simplified. This has the additional benefit that the thickness of the filter plate 14 dictates the size of the chamber opening.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)

Abstract

La présente invention concerne un système combiné d'ouverture de chambre et de décharge de gâteau pour un filtre-presse, comprenant : un cadre de presse comportant une plaque de pression mobile positionnée de façon mobile vers une extrémité de celui-ci et une plaque fixe disposée vers l'extrémité opposée de celui-ci; une pluralité de plaques filtrantes orientées verticalement sont montées dans le cadre de presse et positionnées entre la plaque de pression mobile et la plaque fixe, les plaques filtrantes pouvant se déplacer horizontalement en s'approchant et en s'éloignant les unes des autres en réponse à la plaque de pression, chaque plaque filtrante formant au moins une chambre de filtration fermée par un milieu filtrant; une entrée pour introduire une suspension dans chacune des chambres de filtration sur un côté dudit milieu filtrant; et une sortie reliée à chaque chambre de filtration sur le côté opposé du milieu filtrant pour décharger le filtrat; et le système combiné d'ouverture de chambre et de décharge de gâteau comprenant une pluralité de chariots, chacun étant en contact et conçu pour traverser le milieu filtrant afin de décharger un gâteau de filtration retenu sur ledit milieu, et chaque chariot de la pluralité de chariots venant en butée contre un chariot adjacent de sorte que, lorsque les chariots respectifs traversent le milieu filtrant, les plaques filtrantes respectives sont écartées les unes des autres et la chambre de filtration est ouverte simultanément.
PCT/GB2018/051464 2017-06-09 2018-05-30 Système d'ouverture de chambre et de décharge de gâteau pour un filtre-presse WO2018224806A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1709236.2A GB2558019B (en) 2017-06-09 2017-06-09 Chamber opening and cake discharge system for a filter press
GB1709236.2 2017-06-09

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WO2018224806A1 true WO2018224806A1 (fr) 2018-12-13

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PCT/GB2018/051464 WO2018224806A1 (fr) 2017-06-09 2018-05-30 Système d'ouverture de chambre et de décharge de gâteau pour un filtre-presse

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CN113384927A (zh) * 2021-06-29 2021-09-14 四川久达新材料科技有限公司 脱硫废水施工用板式压滤机清理小车及施工方法
CN116196667A (zh) * 2023-05-06 2023-06-02 东营科宏化工有限公司 一种二叔丁基苯酚制备用压滤设备及压滤方法

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CN109647049A (zh) * 2018-12-06 2019-04-19 徐宝海 一种固液分离用过滤板
CN111991859B (zh) * 2019-05-11 2022-07-05 上海厘清设备有限公司 压滤机

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EP0860188A1 (fr) * 1997-02-22 1998-08-26 Erich Netzsch GmbH & Co. Holding KG Filtre-presse
US5804070A (en) * 1994-12-22 1998-09-08 Eberhard Hoesch & Soehne Gmbh Filter press for filtering suspensions, especially sewage sludge
WO2006106462A2 (fr) * 2005-04-04 2006-10-12 Seprotech (Pty) Limited Filtre-presse comprenant un nouveau mecanisme de liberation de gateau de filtration

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ITBO20040820A1 (it) * 2004-12-28 2005-03-28 Franco Grigoletti Organo di scarico per filtro pressa e relativa struttura portante

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US5804070A (en) * 1994-12-22 1998-09-08 Eberhard Hoesch & Soehne Gmbh Filter press for filtering suspensions, especially sewage sludge
EP0860188A1 (fr) * 1997-02-22 1998-08-26 Erich Netzsch GmbH & Co. Holding KG Filtre-presse
WO2006106462A2 (fr) * 2005-04-04 2006-10-12 Seprotech (Pty) Limited Filtre-presse comprenant un nouveau mecanisme de liberation de gateau de filtration

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113384927A (zh) * 2021-06-29 2021-09-14 四川久达新材料科技有限公司 脱硫废水施工用板式压滤机清理小车及施工方法
CN116196667A (zh) * 2023-05-06 2023-06-02 东营科宏化工有限公司 一种二叔丁基苯酚制备用压滤设备及压滤方法
CN116196667B (zh) * 2023-05-06 2023-08-22 东营科宏化工有限公司 一种二叔丁基苯酚制备用压滤设备及压滤方法

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