A plate-frame filter press and method for producing phosphate

Abstract

The present invention discloses a plate and frame filter press and method for producing phosphate, and relates to the technical field of phosphate production. The plate and frame filter press comprises a frame, a guide rail is arranged on the frame, a plurality of filter plates are slidably adapted on the guide rail, a ejector is also arranged on the frame, the surface of the filter plate is covered with filter cloth, a movable member that can be transferred at least along the longitudinal direction of the plurality of filter plates is arranged on the frame, and the movable member spans the plurality of filter plates, a connecting member is coupled between the filter plate and the movable member, and the connecting member is adapted to be releasable and move in coordination with the movable member. Through the cooperation of the connecting member and the movable member, a plurality of filter plates can be moved longitudinally at the same time, and different filter plates can stop moving after moving different distances, thereby realizing the separation and removal of materials from a plurality of filter plates. Compared with the prior art, the present invention can realize the simultaneous movement and separation of a plurality of filter plates through the cooperation of the connecting member and the movable member, thereby reducing the time required for the separation of the filter plates and improving the efficiency of the filtering operation.

Description

Technical Field

[0001] The invention relates to the technical field of phosphate production, and in particular to a plate and frame filter press and a method for producing phosphate. Background Art

[0002] In the wet phosphoric acid process, the plate and frame filter press is one of the commonly used filtering equipment. The wet phosphoric acid process is to react phosphate rock with sulfuric acid to produce a mixture of phosphoric acid and calcium sulfate, and then a filtration step is required to separate these products. In this step, the plate and frame filter press can efficiently separate the impurities and moisture in the phosphoric acid product, improving the purity and quality of the product. The plate and frame filter press has the advantages of compact structure, simple operation, strong processing capacity, and convenient maintenance, and is very suitable for use in the production of wet phosphoric acid.

[0003] The plate and frame filter press mainly includes components such as a frame, guide rails and filter plates. Specifically, the surface of the filter plate is covered with filter cloth, and a filter cavity is formed when adjacent filter plates are assembled. During filtration, several filter plates can be squeezed and assembled manually or mechanically, and then a phosphoric acid solution is injected into the liquid inlet of the filter plate. The solidified material in the solution will be filtered by the filter cloth to form a filter cake in the filter cavity. In the process of removing the filter cake, the filter plates need to be pulled one by one by the mobile trolley on the frame, so as to separate the adjacent filter plates and remove the filter cake.

[0004] The method of pulling the filter plates one by one to remove the material is inefficient, and a large amount of ineffective man-hours are generated in the filtering operation. There are also technical solutions in the prior art that connect the filter plates, such as steel ropes, to achieve simultaneous separation of the filter plates, but it is still necessary to pull the previous filter plate first to straighten the connecting piece before pulling the next filter plate to move, and it is impossible to truly achieve simultaneous movement and separation of multiple filter plates. Summary of the invention

[0005] The first object of the present invention is to overcome the deficiencies of the prior art and provide a plate and frame filter press for producing phosphate.

[0006] The first object of the present invention is achieved by the following technical solutions:

[0007] A plate and frame filter press for producing phosphates, comprising a frame, a guide rail being arranged on the frame, a plurality of filter plates being slidably adapted on the guide rail, an ejector for driving the plurality of filter plates to be squeezed and spliced ​​together being also arranged on the frame, the surfaces of the filter plates being covered with filter cloths, a movable member being arranged on the frame and capable of being transferred at least along the longitudinal direction of the plurality of filter plates, and the movable member spanning the plurality of filter plates, a connecting member being coupled between the filter plates and the movable member, and the connecting member being adapted to be releasable and move in coordination with the movable member.

[0008] Preferably, the moving member comprises a moving plate that can be ejected longitudinally or a transmission belt arranged longitudinally.

[0009] Preferably, the connecting member comprises an electromagnet arranged on a side wall of the filter plate, and the electromagnet is adapted to be able to adsorb the moving member when energized.

[0010] Preferably, the connecting member includes a first gear arranged on the side wall of the filter plate, and a toothed structure is arranged longitudinally on the movable member, the first gear is engaged with the toothed structure, and the first gear is adapted to limit the circumferential freedom in a releasable manner by a locking member.

[0011] Preferably, the movable member is also adapted to be arranged inclined vertically, a connecting seat is arranged on the side wall of the filter plate along the vertical elastic direction, the electromagnet is arranged on the connecting seat, and the traveling end of the movable member is higher than the feed port of the filter plate, and a vibration angle is formed between the transfer direction of the movable member and the axis of the feed port of the filter plate.

[0012] Preferably, the vibration material angle is 5-15°.

[0013] Preferably, a first roller is rotatably provided on the top of the filter plate, the first gear is arranged at the end of the first roller, and the filter cloth is wound around the first roller, and the filter press has at least two modes that can be selected by controlling the locking and releasing of the locking member: a cooperative movement mode, in which the locking member limits the circumferential freedom of the first gear, thereby driving the first gear to move synchronously with the toothed structure; and a filter cloth spreading mode, in which the locking member releases the circumferential restriction on the first gear, thereby driving the toothed structure to drive the first gear to rotate.

[0014] Preferably, a second roller is rotatably provided on the top of the filter plate, a second gear is provided at the end of the second roller, the second gear is coupled to the first gear, and in the filter cloth spreading mode, the filter cloth is spread out from the first roller and rolled up to the second roller.

[0015] Preferably, the diameters of the first rollers decrease sequentially along the feeding direction of the filter plate.

[0016] The second object of the present invention is to overcome the shortcomings of the prior art and provide a plate and frame filter press method for producing phosphate.

[0017] The second object of the present invention is achieved through the following technical solutions:

[0018] A plate-frame filter press method for producing phosphates, comprising the plate-frame filter press for producing phosphates, and further comprising the following steps:

[0019] S1, driving a plurality of filter plates to be extruded and assembled by the ejector;

[0020] S2, injecting phosphoric acid solution into the feed port of the filter plate, and then the phosphoric acid solution flows into the filter cavity formed between the adjacent filter plates, and the filter cake is filtered in the filter cavity;

[0021] S3. After the filtration is completed, the movable member is controlled to transfer along the longitudinal direction of the plurality of filter plates. By controlling the timing of releasing the coordinated movement of different connecting members and the movable member, the plurality of filter plates can move simultaneously and stop at their respective predetermined longitudinal positions, thereby realizing the separation and removal of materials from the plurality of filter plates.

[0022] The beneficial effects of the present invention are:

[0023] 1. Through the cooperation of the connecting member and the moving member, several filter plates can move longitudinally at the same time, and different filter plates can stop moving after moving different distances, so as to achieve the separation and removal of several filter plates. Compared with the prior art, the present invention can achieve the simultaneous movement and separation of several filter plates through the cooperation of the connecting member and the moving member, thereby reducing the time required for the separation of the filter plates and improving the efficiency of the filtering operation.

[0024] 2. Through the cooperation of the electromagnet and the inclined moving part, the filter plate can fall and impact the frame while releasing the coordinated movement with the moving part, thereby reducing the possibility of filter cake adhering to the filter cloth and realizing the self-cleaning function.

[0025] 3. The cooperation of the first gear, the toothed structure and the first rotating roller enables the present invention to have a filter cloth spreading mode. The possibility of the filter cake adhering to the filter cloth can be reduced by rotating the filter cloth, thereby realizing a self-cleaning function. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an embodiment;

[0027] Figure 2 A schematic diagram of the coordinated movement of the filter plate and the moving member (only the movement of the filter plate on the far right is shown);

[0028] Figure 3 It is a schematic diagram of the structure of the transmission belt;

[0029] Figure 4 for Figure 3 Enlarged view of part A.

[0030] Figure numerals: 1, frame; 2, guide rail; 3, filter plate; 4, ejector; 5, filter cloth; 6, moving part; 7, connecting part; 8, moving plate; 9, transmission belt; 10, electromagnet; 11, first gear; 12, tooth structure; 13, locking part; 14, connecting seat; 15, vibration material angle; 16, first rotating roller; 17, second rotating roller; 18, second gear; 19, guide plate; 20, locking tooth. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1:

[0033] like Figures 1 to 4 As shown, a plate-frame filter press for producing phosphate includes a frame 1. Similar to the plate-frame filter press of the prior art, the frame 1 is constructed with a guide rail 2 extending in the longitudinal direction, and a plurality of filter plates 3 are slidably adapted on the guide rail 2. For example, two guide rails 2 are arranged in the transverse direction, and guide plates 19 are arranged on the two side walls of the filter plate 3, and the filter plate 3 is slidable by supporting the two guide plates 19 on the two guide rails 2. The filter plate 3 can adopt any plate body used in the prior art to realize the filtering function of the plate-frame filter press, and its specific structure is not limited in this disclosure. In short, a plurality of filter plates 3 can be extruded and spliced ​​by the ejection of the ejector 4 on the frame 1, and a filter cavity is formed between adjacent filter plates 3. Since the filter plate 3 is also covered with a filter cloth 5, when the phosphoric acid solution passes into the filter cavity through the feed port of the filter plate 3, under the filtration of the filter cloth 5, filter cakes will be trapped in the filter cavity.

[0034] In order to realize the simultaneous movement and separation of several filter plates 3 to increase the stripping rate, in the present disclosure, a movable member 6 that can be transferred at least along the longitudinal direction of several filter plates 3 is provided on the frame 1, and the movable member 6 has a length that spans across several filter plates 3. In addition, a connecting member 7 is coupled between the filter plate 3 and the movable member 6, and the connecting member 7 is adapted to be able to be selectively completely fixed or completely released from the movable member 6. When the two are completely fixed, the transfer of the movable member 6 will drive the connecting member 7 and the filter plate 3 to move in coordination; when the two are released from complete fixation, the transfer of the movable member 6 will not drive the movement of the connecting member 7 and the filter plate 3, and the filter plate 3 will remain on the frame 1. Among them, the wording "completely fixed" sets the connecting member 7 and the movable member 6 to remain relatively stationary in the transfer direction, and does not limit the two to be fixed only by a rigid connection.

[0035] After the filtration is completed, several connecting members 7 can be controlled to remain fixed with the moving member 6, and then the moving member 6 can be controlled to be shifted in the longitudinal direction. When each filter plate 3 reaches the preset position, the corresponding connecting member 7 is controlled to release the fixed state with the moving member 6, and the filter plate 3 will stay in the original position, and the moving member 6 will continue to shift, driving the remaining filter plates 3 to the preset position. For example, the preset moving distance of the filter plate 3 that is closer to the front along the shifting direction is larger, thereby driving several filter plates 3 to maintain a spacing when they stay, that is, realizing the simultaneous movement and separation of several filter plates 3, and the filter cake can fall down to a conveying component such as a conveyor belt and be sent to the next station.

[0036] In some embodiments, the moving member 6 includes a moving plate 8 that can be ejected in the longitudinal direction. For example, the ejection of the moving plate 8 can be achieved by a linear drive member such as a cylinder, an oil cylinder or an electric rod, or the moving plate 8 can be attached to a transmission belt 9 arranged in the longitudinal direction to achieve ejection. The connecting member 7 may include an electromagnet 10 arranged on the side wall of the filter plate 3, for example, the electromagnet 10 can be arranged on the above-mentioned guide plate 19, and the electromagnet 10 is adapted to be able to adsorb the moving member 6 when powered on. In a possible approach, a magnetic strip or a magnetic plate can be arranged on the side wall of the moving plate 8 to achieve adsorption of the moving plate 8 by the electromagnet 10.

[0037] After the filtration is completed, several electromagnets 10 can be controlled to be in an energized state. As the movable plate 8 moves longitudinally, several filter plates 3 will move in coordination with the movable plate 8. After the filter plate 3 moves a preset distance and reaches a preset position, the corresponding electromagnet 10 is controlled to be in an unpowered state. At this time, the filter plate 3 will stay in place and will not continue to move with the movable plate 8.

[0038] For example, the movable plate 8 can also have vertical displacement in addition to the longitudinal displacement. In a possible approach, the movable plate 8 is integrally attached to another carrier plate (not shown) that can be vertically displaced. After the plurality of filter plates 3 are separated and removed, each connecting member 7 can be re-controlled to be fixed to the movable plate 8, and then the movable plate 8 is controlled to be vertically displaced, and then the connecting member 7 is controlled to release the above-mentioned fixed state, and the plurality of filter plates 3 will fall and hit the frame 1 to achieve material vibration, thereby shaking off the filter cake adhered to the filter cloth 5.

[0039] like Figure 2 As shown, in another embodiment, the moving member 6 is also adapted to be tilted in the vertical direction. Specifically, the traveling end of the moving member 6, that is, the end of the moving member 6 away from the driving member, is higher than the feed port of the filter plate 3, so that a vibration angle 15 is formed between the transfer direction of the moving member 6 and the axis of the feed port of the filter plate 3. As a result, as the moving plate 8 is transferred longitudinally, the filter plate 3 will also be lifted vertically during the process of longitudinal coordinated movement. At this time, after the electromagnet 10 is powered off, the filter plate 3 will fall and hit the frame 1 for the first time to achieve vibration.

[0040] Preferably, the vibration angle 15 may be 5-15°, at which time the vibration effect of the filter plate 3 is better and the operation stability of the filter press is higher.

[0041] In a preferred embodiment, a connecting seat 14 is also provided on the side wall of the filter plate 3 in a vertically elastic manner, and the electromagnet 10 is provided on the connecting seat 14. When the movable plate 8 is shifted in the reverse longitudinal direction, the electromagnet 10 can still be adsorbed on the movable plate 8 to drive the filter plate 3 to move in the reverse longitudinal direction. Since the shifting direction of the movable plate 8 is inclined, the connecting seat 14 will be driven to move in the vertical direction, and the filter plate 3 will not be able to move in the reverse longitudinal direction. Therefore, the ejector 4 on the frame 1 can be removed, and the extrusion and splicing of a plurality of filter plates 3 can be achieved by shifting the movable plate 8 in the reverse longitudinal direction.

[0042] As another solution, the moving member 6 may only include a transmission belt 9 arranged in the longitudinal direction, and the connecting member 7 includes a first gear 11 arranged on the side wall of the filter plate 3. In addition, a toothed structure 12 is arranged in the longitudinal direction on the moving member 6, and the first gear 11 is engaged with the toothed structure 12. It can be understood that the toothed structure 12 is not limited to being arranged on the side wall of the transmission belt 9, for example, the toothed structure 12 can also be arranged on the side wall of the above-mentioned moving plate 8. And the first gear 11 is also adapted to limit the circumferential degree of freedom that can be released by the locking member 13.

[0043] After the filtration is completed, several first gears 11 can be controlled to be unable to rotate circumferentially under the locking of the corresponding locking pieces 13. As the transmission belt 9 is longitudinally shifted, the toothed structure 12 can push the filter plate 3 and the transmission belt 9 to move in coordination through the first gears 11; after the filter plate 3 moves a preset distance and reaches a preset position, the corresponding locking pieces 13 are controlled to release the restriction on the circumferential freedom of the first gears 11. At this time, the filter plate 3 will stay in place instead of continuing to move with the transmission belt 9, and the first gear 11 will rotate under the transmission of the toothed structure 12.

[0044] For example, the top of the filter plate 3 may also be rotatably provided with a first roller 16, the first gear 11 is provided at the end of the first roller 16, and the filter cloth 5 is adapted to be wound around the first roller 16. Therefore, by controlling the locking and releasing of the locking member 13, the present disclosure has at least two selectable modes as follows:

[0045] In the coordinated movement mode, the locking member 13 limits the circumferential freedom of the first gear 11, thereby driving the first gear 11 to move synchronously with the toothed structure 12. That is, in the coordinated movement mode, several filter plates 3 can be moved and separated at the same time to facilitate unloading.

[0046] Filter cloth spreading mode: In the filter cloth spreading mode, the locking member 13 releases the circumferential restriction on the first gear 11, thereby driving the toothed structure 12 to drive the first gear 11 to rotate. That is, after the filter plate 3 is unloaded, the first roller 16 will rotate under the transmission of the toothed structure 12 and the first gear 11 through the transfer of the moving member 6, thereby driving the filter cloth 5 to rotate to drive the filter cake adhering thereto to separate.

[0047] In some embodiments, the locking member 13 may include a locking tooth 20 disposed on the filter plate 3, and the locking tooth 20 may be engaged with and disengaged from the first gear 11 through a braking device, thereby limiting and releasing the circumferential degree of freedom of the first gear 11. Alternatively, the locking member 13 may also be an electromagnetic clutch device (not shown) disposed on the rotating shaft of the first gear 11 (or the first roller 16), and the circumferential degree of freedom of the first gear 11 may be limited by the electromagnetic clutch device engaging the rotating shaft.

[0048] For example, a second roller 17 may be rotatably provided on the top of the filter plate 3, and a second gear 18 may be provided at the end of the second roller 17. The filter cloth 5 may extend from the first roller 16 to cover the filter plate 3 and then be rewound to the second roller 17, and the second gear 18 may be adapted to be coupled to the first gear 11. The phrase "the second gear 18 is coupled to the first gear 11" means that the second gear 18 may be directly meshed with the first gear 11, or the two may be meshed by a gear set or the like, or both may be meshed with the toothed structure 12. As for the winding direction of the filter cloth 5 on the two rollers, it may be selected according to actual conditions, and will not be described here.

[0049] Therefore, in the filter cloth spreading mode, the filter part of the filter cloth 5 on the filter plate 3 can be replaced by the cooperation of the two rollers.

[0050] In a preferred embodiment, the diameters of the first rollers 16 can be reduced in sequence along the feeding direction of the filter plate 3. It can be understood that at this time, the diameter of the first roller 16 on the filter plate 3 that first receives the phosphoric acid solution is larger, and at the same speed generated by the transmission of the first gear 11 and the toothed structure 12, the first roller 16 with a larger diameter can drive the filter cloth 5 to rotate at a higher speed, thereby making the filter cake adhered to the filter cloth 5 more susceptible to inertia and centrifugal force and easier to be thrown out and separated, which makes it less likely for the filter plate 3 that is more likely to adhere to the filter cake because it first receives the phosphoric acid solution to be less likely to have sticky material.

[0051] Embodiment 2:

[0052] A plate-frame filter press method for producing phosphate, comprising the plate-frame filter press of embodiment 1, and further comprising the following steps:

[0053] S1, driving a plurality of filter plates 3 to be squeezed and assembled by the ejector 4;

[0054] S2, injecting phosphoric acid solution into the feed port of the filter plate 3, and then the phosphoric acid solution flows into the filter cavity formed between the adjacent filter plates 3, and the filter cake is filtered in the filter cavity;

[0055] S3. After the filtration is completed, the movable member 6 is controlled to transfer along the longitudinal direction of the plurality of filter plates 3. By controlling the timing of releasing the coordinated movement of different connecting members 7 and the movable member 6, the plurality of filter plates 3 can move simultaneously and stop at their respective predetermined longitudinal positions, thereby realizing the separation and removal of the plurality of filter plates 3.

[0056] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A plate and frame filter press for producing phosphate, comprising a frame (1), a guide rail (2) being arranged on the frame (1), a plurality of filter plates (3) being slidably adapted on the guide rail (2), a ejector (4) being further arranged on the frame (1) for driving the plurality of filter plates (3) to be squeezed and assembled, a filter cloth (5) being covered on the surface of the filter plate (3), wherein: The frame (1) is provided with a moving member (6) capable of at least transferring along the longitudinal direction of a plurality of the filter plates (3), and the moving member (6) spans across the plurality of the filter plates (3), a connecting member (7) is coupled between the filter plates (3) and the moving member (6), and the connecting member (7) is adapted to be releasable and move in coordination with the moving member (6); The connecting member (7) comprises an electromagnet (10) arranged on the side wall of the filter plate (3), and the electromagnet (10) is adapted to be able to adsorb the moving member (6) when energized; the moving member (6) is also adapted to be arranged to be inclined in the vertical direction, and a connecting seat (14) is arranged on the side wall of the filter plate (3) in a vertically elastic manner, and the electromagnet (10) is arranged on the connecting seat (14), and the moving end of the moving member (6) is higher than the feed opening of the filter plate (3), and a vibration angle (15) is formed between the transfer direction of the moving member (6) and the axis of the feed opening of the filter plate (3); and, or The connecting member (7) comprises a first gear (11) arranged on the side wall of the filter plate (3); a toothed structure (12) is arranged on the movable member (6) in the longitudinal direction; the first gear (11) is meshed with the toothed structure (12); and the first gear (11) is adapted to limit the circumferential degree of freedom in a releasable manner through a locking member (13); A first roller (16) is rotatably arranged on the top of the filter plate (3), the first gear (11) is arranged at the end of the first roller (16), and the filter cloth (5) is wound around the first roller (16), and the filter press has at least two modes that can be selected by controlling the locking and releasing of the locking member (13): a coordinated movement mode, in which the locking member (13) limits the circumferential degree of freedom of the first gear (11), thereby driving the first gear (11) to follow the toothed structure (12) for synchronous load transfer; A filter cloth spreading mode, in which the locking member (13) releases the circumferential restriction on the first gear (11), thereby driving the toothed structure (12) to drive the first gear (11) to rotate.

2. The plate and frame filter press for producing phosphate according to claim 1, characterized in that: The moving member (6) comprises a moving plate (8) that can be pushed out in the longitudinal direction or a transmission belt (9) arranged in the longitudinal direction.

3. The plate and frame filter press for producing phosphate according to claim 1, characterized in that: The vibration material angle (15) is 5-15°.

4. The plate and frame filter press for producing phosphate according to claim 1, characterized in that: A second roller (17) is rotatably arranged on the top of the filter plate (3), a second gear (18) is arranged at the end of the second roller (17), and the second gear (18) is coupled to the first gear (11). In the filter cloth spreading mode, the filter cloth (5) is spread out from the first roller (16) and rolled up to the second roller (17).

5. The plate and frame filter press for producing phosphate according to claim 1, characterized in that: The diameters of the plurality of first rotating rollers (16) decrease sequentially along the feeding direction of the filter plate (3).

6. A plate-frame filter press method for producing phosphate, comprising the plate-frame filter press for producing phosphate according to any one of claims 1 to 5, characterized in that: The following steps are also included: S1, driving a plurality of filter plates (3) to be extruded and assembled by the ejector (4); S2, injecting a phosphoric acid solution into the feed port of the filter plate (3), and then the phosphoric acid solution flows into the filter cavity formed between the adjacent filter plates (3), and filtering the filter cake in the filter cavity; S3. After the filtration is completed, the moving member (6) is controlled to be transferred along the longitudinal direction of the plurality of filter plates (3). By controlling the timing of releasing the coordinated movement of the different connecting members (7) and the moving member (6), the plurality of filter plates (3) can move simultaneously and stop at their respective predetermined longitudinal positions, thereby achieving separation and removal of the plurality of filter plates (3).

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