Solid-liquid separation equipment for processing arsenic filter cake slurry

Abstract

The application discloses a kind of solid-liquid separation equipment for arsenic filter cake slurry processing, comprising: frame, multiple filter plates are movably installed on the frame transversely, opposite sides of adjacent two filter plates are respectively provided with filter cavities, the middle part of filter plate is respectively fixed with corresponding conduit, filter cloth is respectively fixed on filter plate;Compression mechanism is used to push and compact multiple filter plates, the conduit on the frame is provided with pressurized feed pipe connected to filter plate;Multifunctional filter-pressing mechanism includes pressurized air inlet assembly for pushing outwards to the filter cloth and several push blocks fixed on the filter cloth, several corresponding sharp ridges are respectively transversely provided on the push block, several vibration blocks are respectively telescopically installed between adjacent two push blocks, corresponding ultrasonic transducer is respectively fixedly embedded in vibration block.The application can significantly improve the discharge rate of residual leaching solution in the elution process, thereby assisting to improve the overall solid-liquid separation rate of arsenic filter cake slurry.

Description

TECHNICAL FIELD

[0001] The present application relates to the treatment equipment of arsenic filter cake obtained from copper smelting flue gas treatment, in particular to a kind of solid-liquid separation equipment for arsenic filter cake slurry processing. BACKGROUND

[0002] After being collected and processed, the flue gas generated in the process of copper smelting can produce sulfuric acid products every year, but at the same time, thousands of tons of arsenic filter cake which is difficult to handle will be left, which contains various heavy metals, and if it is discharged at will, it will not only cause the loss of resources, but also cause environmental pollution.

[0003] At present, in the treatment process of arsenic filter cake, first, the arsenic filter cake needs to be slurried, and the arsenic filter cake slurry after slurry treatment is pumped into an oxygen pressure reactor, and the metals in the arsenic filter cake slurry are extracted by continuous oxygen pressure leaching; then, the arsenic filter cake slurry after oxygen pressure leaching is separated by a corresponding solid-liquid separation equipment to obtain filter residue and As 5+ containing leaching solution; subsequently, sulfur dioxide is added to the As 5+ containing leaching solution for reduction, and the reduced leaching solution is cooled and crystallized, and finally dried to obtain arsenic trioxide product (99.5%).

[0004] The existing arsenic filter cake slurry solid-liquid separation equipment mainly uses plate and frame filter press, which mainly includes a plurality of filter plates and a fixed oil cylinder for pressing and fixing the filter cake. Under the pressing action of the fixed oil cylinder, the plurality of filter plates are closed to form a plurality of corresponding filter cavities. The arsenic filter cake slurry entering the filter cavities is effectively filtered by the filter cloth arranged on the filter plate, so that the solid is retained in the filter cavities outside the filter cloth, and the leaching solution is collected outside the filter cloth and enters the next process. In order to improve the discharge rate of the leaching solution, the filter cake after pressure filtration often needs to be washed by a corresponding washing mechanism. Although this can efficiently complete the solid-liquid separation of the arsenic filter cake slurry, the residual leaching solution in the washing process has little effect on the improvement of the discharge rate.

[0005] Therefore, the research purpose of the present application is to design an arsenic filter cake slurry processing solid-liquid separation equipment which can effectively and significantly improve the discharge rate of residual leaching solution in the washing process, thereby effectively assisting to improve the overall solid-liquid separation rate of arsenic filter cake slurry. SUMMARY

[0006] In view of the technical problems existing in the prior art, the present application provides an arsenic filter cake slurry processing solid-liquid separation equipment which can effectively solve the technical problems existing in the prior art.

[0007] The technical scheme of the present application is:

[0008] A solid-liquid separation equipment for processing arsenic filter cake slurry, comprising:

[0009] A rack, a plurality of corresponding filter plates are movably installed on the rack in the transverse direction, opposite sides of adjacent two filter plates are respectively provided with corresponding filter cavities, the middle part of the filter plate is respectively penetrated and fixedly connected with a conduit whose end part is located in the filter cavity, the filter plate outside the filter cavity is also respectively fixedly connected with a filter cloth whose middle part is closed connected to the conduit, the bottom side of the filter plate is respectively outwardly connected with a corresponding discharge pipe, and the discharge pipe is respectively fixedly installed with a corresponding discharge valve;

[0010] A pressing mechanism is used for pushing and pressing a plurality of filter plates, so that adjacent two filter plates form closed abutment with each other, a booster feed pipe connected to the conduit of the filter plate at the end part is arranged on the rack, and the booster feed pipe is connected to an external slurry source;

[0011] A multifunctional filter pressing mechanism comprises a booster air inlet assembly for outwardly pushing the filter cloth, and a plurality of pushing blocks fixedly connected to the filter cloth, a plurality of pointed ridges located outside the filter cloth are respectively arranged on the pushing block in the transverse direction, a corresponding vibration block is respectively and telescopically installed between adjacent two pushing blocks, and a corresponding ultrasonic transducer is respectively and fixedly embedded in the vibration block.

[0012] The vibration block is connected to the corresponding filter plate through a rubber pipe part with a spiral spring pre-embedded, and the pushing block is connected to the filter plate through a corresponding elastic member.

[0013] The booster air inlet assembly comprises an air inlet pipe connected to the filter cavity of the filter plate, and the air inlet pipe is connected to an external air compressor through a corresponding booster pipe.

[0014] The rubber pipe part is connected to the air inlet pipe in parallel through a corresponding electromagnetic valve, and the rubber pipe part is outwardly connected with a corresponding pressure relief valve in parallel.

[0015] The external air compressor starts to hit high-pressure air into the filter cavity of the filter plate to push the filter cloth to expand outwardly to extrude and filter the filter cake, after the filtration is completed, the discharge valve on the discharge pipe is opened, the elastic member drives the pushing block to leave the filter cake, and a plurality of uniformly distributed pointed grooves are formed on the surface of the filter cake; the ultrasonic transducer is started to generate high-frequency vibration, the high-frequency vibration is transmitted through the pointed grooves to make the filter cake quickly form cracks, the pressure relief valve is opened to release pressure, and the vibration block is reset.

[0016] The solid-liquid separation equipment also includes a rinsing mechanism, which includes a rinsing pipe connected to the upper part of the filter chamber of the filter plate. The rinsing pipe is pumped to an external rinsing liquid source through a corresponding rinsing solenoid valve. After the vibrating block is reset, the rinsing solenoid valve is opened, and the external rinsing liquid enters the filter chamber of the filter plate through the rinsing pipe to rinse the broken filter cake.

[0017] After rinsing is completed, the external air compressor is started to inject high-pressure air into the filter chamber of the filter plate, so as to push the filter cloth to expand outward again to squeeze and filter the filter cake.

[0018] The clamping mechanism includes a fixed end plate fixedly installed on the frame and a movable plate movably installed on the frame. The fixed end plate and the movable plate are respectively located on the outside of the plurality of filter plates. The movable plate is connected to the piston rod end of the corresponding push hydraulic cylinder. When the piston rod of the push hydraulic cylinder extends, the plurality of filter plates form a closed connection with each other under the clamping action of the movable plate and the fixed end plate.

[0019] The push blocks are fixed to the filter cloth in a ring array, and the push blocks on two adjacent filter cloths are staggered. The ultrasonic transducer is connected to an external ultrasonic generator.

[0020] The lower part of the frame is equipped with a hopper for collecting the crushed filter cake.

[0021] Advantages of this invention:

[0022] 1) The multifunctional filter press mechanism of the present invention not only includes a pressurized air intake assembly for pushing the filter cloth outward, but also includes several pushing blocks fixed to the filter cloth, and corresponding vibrating blocks are telescopically installed between adjacent pushing blocks. Most importantly, several pointed protrusions located on the outer side of the filter cloth are arranged laterally on the pushing blocks, and corresponding ultrasonic transducers are fixedly embedded in the vibrating blocks.

[0023] In the solid-liquid separation process, firstly, an external slurry source is pumped into the space between the filter cloths of two adjacent filter plates via a pressurized feed pipe. Under the pressure of the feed, the solid material is isolated between the two adjacent filter cloths, while the leachate passes through the filter cloth and filtration chamber, and is discharged outwards along the discharge pipe. Then, the external slurry source stops pumping in, the discharge valve on the discharge pipe closes, and the pressurized air intake assembly injects compressed air into the inside of the filter cloth to push the filter cloth outwards, further compressing and filtering the filter cake. At this time, the pointed ridges effectively form transverse pointed grooves on the filter cake. After filtration is complete, the discharge valve opens to allow leaching. After the liquid is discharged, the ultrasonic transducer starts to vibrate. When the vibration is transmitted through the various transverse pointed grooves of the filter cake, stress concentration is formed, which causes the filter cake to produce uniform cracks. Finally, external rinsing liquid is injected into the filter cake between the filter cloths to thoroughly clean the filter cake with uniform cracks. Then, the pressurized air intake component is activated again to inject high-pressure air into the filter chamber of the filter plate to push the filter cloth to expand outward again to squeeze and filter the filter cake. This effectively and significantly improves the discharge rate of residual leachate during the rinsing process, thereby effectively helping to improve the overall solid-liquid separation rate of the arsenic filter cake slurry.

[0024] 2) The vibrating blocks of the present invention are connected to the corresponding filter plates through rubber tubes with pre-embedded helical springs, the push block is connected to the filter plates through corresponding elastic elements, and the rubber tubes of the present invention are connected in parallel to the intake pipe of the booster intake assembly through corresponding solenoid valves, and the rubber tubes are connected in parallel to the outside of the corresponding pressure relief valves.

[0025] When the filter cloth of this invention expands outward to compress and filter the filter cake, the discharge valve on the discharge pipe opens, allowing the elastic element to drive the push block to promptly leave the filter cake. This creates multiple evenly distributed pointed grooves on the surface of the filter cake, while the vibrating block maintains full contact with the filter cake. At this point, the ultrasonic transducer restarts to generate high-frequency vibration, which allows for more thorough stress concentration when transmitted through the pointed grooves of the filter cake. This ensures that the filter cake quickly forms evenly distributed cracks. Afterward, the pressure relief valve opens to release pressure and reset the vibrating block. This effectively and significantly improves the practical effect of this invention.

[0026] 3) Since the push blocks of the present invention are fixed to the filter cloth in a ring array, and the push blocks on two adjacent filter cloths are staggered, a denser pointed groove is formed at different positions on both sides of the filter cake, thereby increasing the amount of cracks in the filter cake and helping to improve the discharge rate of residual leachate during the rinsing process. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention.

[0028] Figure 2 This is a schematic diagram of the filter plate of the present invention after it is closed and abutted.

[0029] Figure 3 This is a schematic diagram of the structure of the filter plate of the present invention with filter cloth installed.

[0030] Figure 4 This is a schematic diagram of the assembly of the booster intake assembly and the filter plate of the present invention.

[0031] Figure 5 This is a schematic diagram of the assembly of the jacking block and the vibrating block of the present invention.

[0032] In the attached diagram: 1. Frame; 2. Filter plate; 201. Filter chamber; 202. Guide tube; 203. Filter cloth; 204. Discharge pipe; 2041. Discharge valve; 3. Pressing mechanism; 3. Fixed end plate; 301. Movable plate; 302. Pushing hydraulic cylinder; 303. Pressurized feed pipe; 4. Multifunctional filter press mechanism; 5. Pressurized air intake assembly; 501. Air intake pipe; 5011. Pressurized pipe; 5012. Pushing block; 5021. Pointed ridge; 503. Vibrating block; 6. Ultrasonic transducer; 7. Rubber fittings; 8. Elastic component; 9. Solenoid valve; 10. Pressure relief valve; 11. Washing mechanism; 1101. Washing pipe; 1102. Washing solenoid valve; 12. Feed hopper. Detailed Implementation

[0033] To facilitate understanding by those skilled in the art, the structure of the present invention will now be described in further detail with reference to the accompanying drawings:

[0034] refer to Figures 1-5 A solid-liquid separation device for processing arsenic filter cake slurry, comprising:

[0035] A frame 1 is provided, on which multiple corresponding filter plates 2 are movably mounted laterally. Each of two adjacent filter plates 2 has a corresponding filter chamber 201 on its opposite side. The middle part of each filter plate 2 is connected to a conduit 202 with its end located inside the filter chamber 201. Filter cloth 203 with its middle closed and connected to the conduit 202 is also fixedly attached to the filter plate 2 outside the filter chamber 201. The bottom side of each filter plate 2 is connected to a corresponding discharge pipe 204, and a corresponding discharge valve 2041 is fixedly installed on each discharge pipe 204.

[0036] The pressing mechanism 3 is used to push and press the multiple filter plates 2 so that two adjacent filter plates 2 form a closed contact with each other. The frame 1 is provided with a pressurized feed pipe 4 whose discharge end is connected to the guide pipe 202 of the filter plate 2 located at the end. The pressurized feed pipe 4 is pumped to an external slurry source.

[0037] The multi-functional pressure filter mechanism 5 includes a pressurized air intake component 501 for pushing the filter cloth 203 outward, and a plurality of pushing blocks 502 fixed to the filter cloth 203. The pushing blocks 502 are respectively provided with a plurality of pointed protrusions 5021 located on the outer side of the filter cloth 203. A corresponding vibration block 503 is telescopically installed between two adjacent pushing blocks 502. A corresponding ultrasonic transducer 6 is fixedly embedded in the vibration block 503.

[0038] The vibrating blocks 503 are connected to the corresponding filter plates 2 through rubber tubes 7 with pre-embedded helical springs, and the pushing blocks 502 are connected to the filter plates 2 through corresponding elastic elements 8.

[0039] The booster intake assembly 501 includes an intake pipe 5011 connected to the filter chamber 201 of the filter plate 2, and the intake pipe 5011 is connected to an external air compressor through a corresponding booster pipe 5012.

[0040] The rubber fitting 7 is connected in parallel to the air intake pipe 5011 via a corresponding solenoid valve 9, and the rubber fitting 7 is connected in parallel to the outside via a corresponding pressure relief valve 10.

[0041] The external air compressor starts and injects high-pressure air into the filter chamber 201 of the filter plate 2, which pushes the filter cloth 203 to expand outward and squeeze the filter cake for filtration. After filtration is completed, the discharge valve 2041 on the discharge pipe 204 opens, and the elastic element 8 drives the push block 502 to leave the filter cake. Multiple evenly distributed pointed grooves are formed on the surface of the filter cake. The ultrasonic transducer 6 starts to generate high-frequency vibration. The high-frequency vibration is transmitted through the pointed grooves, which quickly form cracks in the filter cake. Then, the pressure relief valve 10 opens to release pressure, and the vibration block 503 resets.

[0042] The solid-liquid separation equipment also includes a rinsing mechanism 11, which includes a rinsing pipe 1101 connected to the upper part of the filter chamber 201 of the filter plate 2. The rinsing pipe 1101 is pumped to an external rinsing liquid source through a corresponding rinsing solenoid valve 1102. After the vibrating block 503 is reset, the rinsing solenoid valve 1102 is opened, and the external rinsing liquid enters the filter chamber 201 of the filter plate 2 through the rinsing pipe 1101 to rinse the broken filter cake.

[0043] After rinsing is completed, the external air compressor is started to inject high-pressure air into the filter chamber 201 of the filter plate 2, so as to push the filter cloth 203 to expand outward again to squeeze and filter the filter cake.

[0044] The multifunctional pressure filter mechanism 5 of the present invention not only includes a pressurized air intake assembly 501 for pushing the filter cloth 203 outward, but also includes a plurality of pushing blocks 502 fixed to the filter cloth 203, and a corresponding vibrating block 503 is telescopically installed between two adjacent pushing blocks 502. Most importantly, a plurality of pointed protrusions 5021 located on the outer side of the filter cloth are arranged laterally on the pushing blocks 502, and a corresponding ultrasonic transducer 6 is fixedly embedded in the vibrating blocks 503. In the solid-liquid separation process, firstly, an external slurry source is pumped into the space between the filter cloths 203 of two adjacent filter plates 2 via a pressurized feed pipe 4. Under the pressure of the feed, the solid material is isolated between the two adjacent filter cloths 203, while the leachate passes through the filter cloths 203 and the filtration chamber 201, and is discharged along the discharge pipe 204. Then, the external slurry source stops pumping in, the discharge valve 2041 on the discharge pipe 204 is closed, and the pressurized air intake assembly 501 injects compressed air into the inner side of the filter cloths 203 to push the filter cloths 203 outward to further compress and filter the filter cake. At this time, the pointed ridges 5021 effectively form transverse pointed grooves on the filter cake. After filtration is completed... The discharge valve 2041 is opened to discharge the leachate. Then, the ultrasonic transducer 6 starts to vibrate. When the vibration is transmitted through the transverse pointed grooves of the filter cake, stress concentration is formed, which causes uniform cracks to appear in the filter cake. Finally, external rinsing liquid is injected into the filter cake between the filter cloths 203 to thoroughly clean the filter cake with uniform cracks. Then, the pressurized air intake component 501 is started again to inject high-pressure air into the filter chamber 201 of the filter plate 2 to push the filter cloth 203 to expand outward again to squeeze and filter the filter cake. This effectively and significantly improves the discharge rate of residual leachate during the rinsing process, thereby effectively helping to improve the overall solid-liquid separation rate of the arsenic filter cake slurry.

[0045] The vibrating blocks 503 of the present invention are connected to the corresponding filter plates 2 via rubber tubes 7 with pre-embedded helical springs. The push blocks 502 are connected to the filter plates 2 via corresponding elastic elements 8. The rubber tubes 7 are connected in parallel to the air intake pipe 5011 of the pressurized air intake assembly 501 via corresponding solenoid valves 9. The rubber tubes 7 are also connected in parallel to the outside of the corresponding pressure relief valves 10. When the filter cloth 203 expands outward to squeeze and filter the filter cake, the discharge valve 2041 on the discharge pipe opens. The elastic element 8 can drive the push blocks 502 to leave the filter cake in time, so that multiple evenly distributed pointed grooves are formed on the surface of the filter cake. The vibrating blocks 503 still maintain full contact with the filter cake. At this time, the ultrasonic transducer 6 is restarted to generate high-frequency vibration, which can make the high-frequency vibration form a more sufficient stress concentration when it is transmitted through the pointed grooves of the filter cake, thereby ensuring that the filter cake can quickly form evenly distributed cracks. Then, the pressure relief valve 10 is opened to release pressure and reset the vibrating blocks 503. This effectively and significantly improves the practical effect of the present invention.

[0046] The clamping mechanism 3 includes a fixed end plate 301 fixedly installed on the frame 1 and a movable plate 302 movably installed on the frame 1. The fixed end plate 301 and the movable plate 302 are respectively located on the outside of the plurality of filter plates 2. The movable plate 302 is connected to the piston rod end of the corresponding push hydraulic cylinder 303. When the piston rod of the push hydraulic cylinder 303 extends, the plurality of filter plates 2 form a closed connection with each other under the clamping action of the movable plate 302 and the fixed end plate 301.

[0047] The push blocks 502 are fixed to the filter cloth 203 in a circular array, and the push blocks 502 on two adjacent filter cloths 203 are staggered. The ultrasonic transducer 6 is connected to an external ultrasonic generator. The lower part of the frame 1 is provided with a hopper 12 for collecting the broken filter cake.

[0048] Since the pusher blocks 502 of the present invention are fixed to the filter cloth 203 in a ring array, and the pusher blocks 502 on two adjacent filter cloths 203 are staggered, a denser pointed groove is formed at different positions on both sides of the filter cake, thereby increasing the amount of cracks in the filter cake, so as to help improve the discharge rate of residual leachate during the rinsing process.

[0049] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A solid-liquid separation device for processing arsenic filter cake slurry, characterized in that, include: A frame (1) is provided with multiple corresponding filter plates (2) that are movably mounted laterally. Each of two adjacent filter plates (2) has a corresponding filter chamber (201) on its opposite side. The middle part of each filter plate (2) is connected to a conduit (202) with its end located inside the filter chamber (201). Filter cloths (203) that are closed in the middle and connected to the conduit (202) are also fixedly connected to the filter plates (2) outside the filter chamber (201). The bottom side of each filter plate (2) is connected to a corresponding discharge pipe (204) that is fixedly mounted on the discharge pipe (204). A corresponding discharge valve (2041) is fixedly mounted on each discharge pipe (204). The pressing mechanism (3) is used to push and press the multiple filter plates (2) so that two adjacent filter plates (2) form a closed contact with each other. The frame (1) is provided with a pressurized feed pipe (4) whose discharge end is connected to the guide pipe (202) of the filter plate (2) located at the end. The pressurized feed pipe (4) is pumped to an external slurry source. The multi-functional pressure filter mechanism (5) includes a pressurized air intake assembly (501) for pushing the filter cloth (203) outward, and a number of push blocks (502) fixed to the filter cloth (203). The push blocks (502) are respectively provided with a number of pointed ridges (5021) located on the outer side of the filter cloth (203) in a horizontal direction. A corresponding vibration block (503) is telescopically installed between two adjacent push blocks (502). A corresponding ultrasonic transducer (6) is fixedly embedded in the vibration block (503).

2. The solid-liquid separation equipment for processing arsenic filter cake slurry according to claim 1, characterized in that, The vibrating blocks (503) are connected to the corresponding filter plates (2) through rubber tubes (7) with pre-embedded helical springs, and the push blocks (502) are connected to the filter plates (2) through corresponding elastic elements (8).

3. The solid-liquid separation equipment for processing arsenic filter cake slurry according to claim 2, characterized in that, The booster intake assembly (501) includes an intake pipe (5011) connected to the filter chamber (201) of the filter plate (2), and the intake pipe (5011) is connected to an external air compressor via a corresponding booster pipe (5012).

4. The solid-liquid separation equipment for processing arsenic filter cake slurry according to claim 3, characterized in that, The rubber fitting (7) is connected in parallel to the air intake pipe (5011) via a corresponding solenoid valve (9), and the rubber fitting (7) is connected in parallel to the outside via a corresponding pressure relief valve (10).

5. The solid-liquid separation equipment for processing arsenic filter cake slurry according to claim 4, characterized in that, The external air compressor starts to inject high-pressure air into the filter chamber (201) of the filter plate (2) to push the filter cloth (203) to expand outward and squeeze the filter cake for filtration. After filtration is completed, the discharge valve (2041) on the discharge pipe (204) is opened, and the elastic element (8) drives the push block (502) to leave the filter cake. Multiple evenly distributed pointed grooves are formed on the surface of the filter cake. The ultrasonic transducer (6) starts to generate high-frequency vibration. The high-frequency vibration is transmitted through the pointed grooves to make the filter cake quickly form cracks. Then the pressure relief valve (10) opens to release pressure, and the vibration block (503) is reset.

6. The solid-liquid separation equipment for processing arsenic filter cake slurry according to claim 5, characterized in that, The solid-liquid separation device also includes a rinsing mechanism (11), which includes a rinsing pipe (1101) connected to the upper part of the filter chamber (201) of the filter plate (2). The rinsing pipe (1101) is pumped to an external rinsing liquid source through a corresponding rinsing solenoid valve (1102). After the vibrating block (503) is reset, the rinsing solenoid valve (1102) is opened, and the external rinsing liquid enters the filter chamber (201) of the filter plate (2) through the rinsing pipe (1101) to rinse the broken filter cake.

7. The solid-liquid separation equipment for processing arsenic filter cake slurry according to claim 6, characterized in that, After rinsing is completed, the external air compressor is started to inject high-pressure air into the filter chamber (201) of the filter plate (2) to push the filter cloth (203) to expand outward again to squeeze and filter the filter cake.

8. The solid-liquid separation equipment for processing arsenic filter cake slurry according to claim 1, characterized in that, The pressing mechanism (3) includes a fixed end plate (301) fixedly installed on the frame (1) and a movable plate (302) movably installed on the frame (1). The fixed end plate (301) and the movable plate (302) are respectively located on the outside of the plurality of filter plates (2). The movable plate (302) is connected to the piston rod end of the corresponding push hydraulic cylinder (303). When the piston rod of the push hydraulic cylinder (303) extends, the plurality of filter plates (2) form a closed connection with each other under the pressing action of the movable plate (302) and the fixed end plate (301).

9. The solid-liquid separation equipment for processing arsenic filter cake slurry according to claim 1, characterized in that, The push blocks (502) are fixed to the filter cloth (203) in a ring array, and the push blocks (502) on two adjacent filter cloths (203) are staggered. The ultrasonic transducer (6) is connected to an external ultrasonic generator.

10. A solid-liquid separation device for processing arsenic filter cake slurry according to claim 1, characterized in that, The lower part of the frame (1) is provided with a hopper (12) for collecting the broken filter cake.

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