Rapid filtering device for potassium fluoborate and filtering method thereof

Abstract

The invention relates to a rapid filtering device and method for potassium fluoborate production, aiming at the characteristics of slurry containing KBF4 crystal (D50 = 20-50 [mu] m), colloidal metaboric acid (HBO2) and potassium fluosilicate (K2SiF6) impurities prepared by a hydrofluoric acid-boric acid method, the device adopts a sliding block type filter frame and inflatable elastic filter cloth structure, and is matched with a rotary scraper and a hydraulic turning plate mechanism; the method comprises the following steps: controlling the temperature of reaction slurry with the solid content of 15-30wt% to 38-58 DEG C, pumping the reaction slurry into a device, breaking KBF4-K2SiF6 heterogeneous aggregates through 5-22rpm rotary stirring, triggering 0.48-0.82 MPa inflatable extrusion to peel boric acid colloid when the filtering pressure difference reaches 0.3-0.6 MPa, driving a scraper to radially feed 5-18mm crushed pressed cakes after a gas source is closed, further separating crystals and wrapping mother liquor through secondary extrusion (0.42-0.68 MPa), and finally obtaining the high-purity KBF4-K2SiF6 / KBF4-K2SiF6 / KBF4-K2SiF6 / KBF4-K2SiF6 / KBF4-K2SiF6 composite material. And finally, a filter cake with the water content of 15-25wt% is discharged by a hydraulic overturning guide plate (the inclination angle of 25-40 degrees). Compared with a traditional process, the method has the advantages that the B2O3 residual quantity is reduced to be less than or equal to 0.15 wt% (reduced by more than 50%), the filtering efficiency is improved by 2.1-3.2 times, and the method is suitable for a ten-thousand-ton potassium fluoborate production line.

Description

Technical Field

[0001] The invention belongs to the technical field of filtering devices and relates to a rapid filtering device for potassium fluoroborate and a filtering method thereof. Background Art

[0002] In the chemical production process of potassium fluoborate, filtration is a key step to ensure product quality and production efficiency. However, traditional potassium fluoborate filtration devices have exposed many technical difficulties in actual applications. These problems have seriously restricted the development of the potassium fluoborate production industry.

[0003] The filtration structure of traditional filtration devices is usually relatively simple, lacking effective anti-clogging and clearing designs (colloidal boric acid impurities (such as metaboric acid HBO2) easily form a gelatinized layer on the surface of the filter cloth, causing clogging of the filter pores; by-products such as potassium fluorosilicate (K2SiF6) form heterogeneous agglomerates with KBF4 crystals, increasing the filter cake resistance). During the filtration process, impurities easily accumulate rapidly on the surface of the filter plate and filter cloth, causing the filter pores to become blocked and the filtration speed to drop significantly. In order to maintain production, the filtration process needs to be frequently interrupted to clear the blockage, which seriously affects the continuity and stability of production.

[0004] In addition, the design of traditional filtering devices also has defects. Although the connection between the filter frame and the device body is simple, the height is relatively high. The disassembly process is laborious and cumbersome, and requires a lot of time and energy. This not only increases maintenance costs, but may also cause the device to be down for too long during maintenance, further reducing production efficiency.

[0005] Therefore, we proposed a rapid filtration device and a filtration method for potassium fluoroborate to solve the above-mentioned problems. Summary of the Invention

[0006] In view of this, the present invention provides a rapid filtration device for potassium fluoroborate and a filtration method thereof in order to solve the problems that impurities tend to accumulate rapidly on the surface of the filter plate and the filter cloth during the filtration process, resulting in clogging of the filter pores and the filter frame is laborious and cumbersome during disassembly, requiring a lot of time and energy.

[0007] To achieve the above object, the present invention provides the following technical solution: a rapid filtration device for potassium fluoroborate, comprising: frame; Multiple filter frames are slidably arranged on the frame, and sliders are provided on both sides of each filter frame, and the sliders are slidably matched with the frame; The filter plate and the elastic filter cloth are fixedly arranged in the filter frame, a central through pipe is provided between the filter plate and the elastic filter cloth, and the chamber between the two is connected to the external air source; The cleaning mechanism includes a transmission assembly and a plurality of connection frames, wherein a scraping strip is provided in the connection frame, and the transmission assembly is used to drive the connection frame to rotate; The sliding carriage is arranged on the frame, driven by the driving assembly to move linearly, and cooperates with the transmission assembly; The air source drives the elastic filter cloth to expand, squeezing impurities between adjacent filter frames to promote liquid outflow. At the same time, the sliding vehicle moves to drive the transmission assembly to rotate, driving the connecting frame to stir impurities and use the scraper to crush the cake, thereby reducing blockage of the filter plate and the elastic filter cloth.

[0008] As a further improvement of the above technical solution: The transmission assembly includes a first rotating shaft and a rotating ring. The first rotating shaft passes through one side of the filter frame and is rotatably arranged. The rotating ring is rotatably sleeved on the outer wall of the central tube, and one end of the rotating ring extends to one side of the filter plate. A plurality of connecting frames are arranged in an annular array on the outer wall of the rotating ring, the outer wall of the rotating ring is sleeved with a first basin angle tooth, and one end of the first rotating shaft is fixedly sleeved with a second basin angle tooth engaged with the first basin angle tooth; A gear is fixedly sleeved on the outer wall of the first rotating shaft, and a rack meshing with the gear is fixedly provided on one side of the sliding vehicle.

[0009] A plurality of sliding rods are provided on one side of the rotating ring for sliding movement, one end of each sliding rod is fixedly connected to the scraper bar, and the other ends of the plurality of sliding rods are fixedly connected to the same connecting ring; A connection box is fixedly provided on one side of the filter plate, and two guide rods are provided in the connection box. The two guide rods are slidably sleeved on a connection frame, and the bottom end of the connection frame is fixedly connected to the connection block; A first cam is provided on the outer wall of the first rotating shaft, and the first cam is located in the connecting block; When the first rotating shaft rotates, the first cam drives the connecting block to move back and forth, and pushes the connecting ring through the connecting frame to drive the scraper to move outward and feed to crush the pressed cake.

[0010] The sliding carriage is provided with two push blocks by rotating two connecting shafts, and a torsion spring is sleeved on the outer wall of the connecting shaft, and the two ends of the torsion spring respectively abut against the push block and the inner wall of the sliding carriage; Two micro electric push rods are fixedly provided in the sliding carriage, and the output ends of the micro electric push rods abut against the bottom of the push block; Among them, when the micro electric push rod is extended, the lever mechanism drives the push block to flip, and the push block can knock the slider to generate vibration under the action of the torsion spring, reducing the blockage of the filter plate and the elastic filter cloth.

[0011] Also includes: Two guide plates are arranged at the bottom of the frame; The second hydraulic cylinder is arranged on the frame and is used for driving the guide plate to flip to guide the pressed cake to be discharged.

[0012] The second rotating shafts are rotatably provided on both sides of the frame through bearings, the two guide plates are respectively sleeved on the outer walls of the second rotating shafts, and the two second rotating shafts are rotatably connected to the same connecting rod; One end of the second hydraulic cylinder is rotatably arranged on the frame, and the other end is rotatably connected to one of the second rotating shafts.

[0013] It also includes a jacking assembly, which includes a connecting seat and a lifting rod. The connecting seat is fixedly arranged in the frame, and the lifting rod is slidably arranged on the top of the connecting seat, and a U-shaped opening is opened on the top; The lifting rod is matched with the second rotating shaft through a connecting piece; When the second rotating shaft flips, the lifting rod is driven to move upwards through the connecting piece to lift the filter frame.

[0014] The connecting member includes a second cam, a rotating rod and a connecting column; The second cam is fixedly sleeved on the outer wall of the second rotating shaft; A rotating seat is fixedly provided on the top of the connecting seat, a rotating rod is provided on one side of the rotating seat through a rotating shaft, and one end of the rotating rod abuts against the second cam; The other end of the rotating rod is provided with a waist-shaped hole, and a connecting column is provided in the waist-shaped hole, and the connecting column is fixedly connected to the lifting rod; When the second rotating shaft rotates, the second cam drives the rotating rod to rotate, and pushes the lifting rod to move upward through the lever mechanism.

[0015] A strip-shaped hole is provided on one side of the frame, and the first rotating shaft is located in the strip-shaped hole; The top of the frame is provided with a plug hole which is in communication with the strip hole, and an insert block is inserted into the plug hole through interference fit to block the strip hole.

[0016] A method for filtering potassium borofluoride, using the above-mentioned rapid filtration device, comprises the steps of: S1. Potassium fluoroborate (KBF4) is prepared using the hydrofluoric acid-boric acid method: a 30-40 wt% hydrofluoric acid solution is reacted with boric acid (H3BO3) at a molar ratio of 1.8-2.2:1 at 60-85°C to produce fluoroboric acid (HBF4). A saturated potassium fluoride solution (40-50 wt%) is then added for a double decomposition reaction. The resulting system contains the target product, KBF4 crystals, unreacted boric acid particles, potassium fluoride byproduct, and a small amount of colloidal silicate impurities, forming a solid-liquid mixed slurry (solids content 15-35 wt%). The slurry needs to be separated to avoid excessive dissolution of KBF4 crystals in the mother liquor (solubility is about 4.5g / 100g water, 25°C) or recrystallization of impurities. The potassium fluoroborate reaction slurry prepared by the hydrofluoric acid-boric acid method is cooled to 40-60°C; deionized water is added to adjust the solid content to 15-30wt%, and after stirring, it is allowed to stand for 5-15 minutes to allow particles >200μm to settle. The first hydraulic cylinder (2) is started to extend, driving the pressure plate (3) to move to push the multiple filter frames (4) to form a chamber; S2, pumping the pretreated slurry into the chamber at a flow rate of 0.8-1.5 m³ / h and filtering it through the filter plate and elastic filter cloth; S3, driving the sliding carriage to move, driving the transmission assembly to rotate through the rack meshing gear, and driving the connecting frame to stir the impurities; S4. When impurities accumulate, open the air source to expand the elastic filter cloth, squeeze the impurities to promote liquid outflow; S5. After turning off the air source, the sliding carriage is driven to move again, so that the scraper moves outward to crush the pressed cake; S6. Drive the second hydraulic cylinder to retract and flip the guide plate to discharge the pressed cake; wherein, the stirring and squeezing process reduces the clogging of the filter plate and the elastic filter cloth, thereby improving the filtration efficiency.

[0017] The beneficial effects of the present invention are: 1. The rapid filtration device for potassium fluoroborate disclosed in the present invention is provided with multiple filter frames and filter plates and elastic filter cloths used in conjunction therewith. During the filtration process, an air source is used to drive the elastic filter cloth to expand, squeezing impurities between the two filter frames, effectively promoting the outflow of liquid in the impurities, greatly improving the filtration efficiency, reducing the filtration time, and at the same time making the filtered liquid higher in purity, thereby ensuring the quality and efficiency of the liquid filtration process in the potassium fluoroborate production process; 2. In the rapid filtering device for potassium fluoroborate disclosed in the present invention, the cleaning mechanism utilizes a sliding vehicle to drive the transmission assembly to rotate, thereby driving the rotation of multiple connecting frames. During the rotation process, impurities between the filter frames are stirred, which can promptly break up the accumulation of impurities on the surface of the filter plate and the elastic filter cloth, greatly reducing the clogging of the filter plate and the elastic filter cloth, extending the service life of the filter cloth and the filter plate, reducing maintenance costs, and also ensuring the continuity and stability of the filtration process; 3. The rapid filtration device for potassium fluoroborate disclosed in the present invention, after the press cake is formed, drives the scraper bar to rotate and move outward in the connecting frame by a sliding vehicle to crush the press cake. The crushed press cake is again squeezed by the expansion of the elastic filter cloth, further reducing the moisture content in the press cake, improving the dryness of the solid after filtration, reducing the subsequent production steps of potassium fluoroborate, and helping to improve processing efficiency; 4. The rapid filtering device for potassium fluoroborate disclosed in the present invention can easily remove the filter frame from the frame for maintenance by pushing the filter frame to a specific position, pulling out the plug, and using the lifting assembly to lift the filter frame on one side during the flipping of the guide plate. This greatly shortens maintenance time, reduces maintenance difficulty, and improves the maintainability and efficiency of the equipment. 5. In the rapid filtering device for potassium fluoroborate disclosed in the present invention, during the movement of the sliding carriage, the push block is pushed to flip by the cooperation of the micro electric push rod and the push block using the principle of leverage, and vibration is generated during the contact and separation process between the push block and the slider. The vibration can be transmitted to the filter frame and related components, further reducing the possibility of clogging of the filter plate and the elastic filter cloth, providing a strong guarantee for the smooth progress of the entire filtration process, and ensuring the stability and reliability of the device during long-term operation.

[0018] The present invention, through the design of elastic filter cloth expanding and squeezing impurities, can effectively promote the discharge of liquid in impurities and improve the filtering effect. The synergistic effect of the rotating stirring and the crushing movement of the scraper in the cleaning mechanism effectively reduces the blockage of the filter plate and the elastic filter cloth. The push block flips and knocks the slider to generate vibration, which further enhances the anti-blocking ability. The jacking component and the flipping cooperation of the guide plate are convenient for the smooth discharge of the pressed cake and the maintenance of the filter frame.

[0019] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which: Figure 1 This is a schematic diagram of the three-dimensional structure of the rapid filtration device for potassium fluoroborate of the present invention; Figure 2 This is a schematic diagram of the filter frame structure of the rapid filtration device for potassium fluoroborate of the present invention; Figure 3 for Figure 2 Schematic diagram of the decomposition structure; Figure 4 This is a schematic diagram of the transmission assembly structure of the rapid filtering device for potassium fluoroborate of the present invention; Figure 5 This is a schematic diagram of the strip-shaped hole structure of the rapid filtration device for potassium fluoroborate of the present invention; Figure 6 This is a schematic cross-sectional view of a sliding vehicle of a rapid filtration device for potassium fluoroborate according to the present invention; Figure 7 This is a schematic diagram of the structure of the cooperation between the lifting assembly and the second hydraulic cylinder of the rapid filtering device for potassium fluoroborate of the present invention; Figure 8 The figure is a schematic diagram of the scraper and cake pressing structure of the rapid filtration device for potassium fluoroborate of the present invention.

[0021] Reference numerals: 1, frame; 2, first hydraulic cylinder; 3, pressure plate; 4, filter frame; 5, guide plate; 6, filter plate; 7, central pipe; 8, connecting frame; 9, slider; 10, first rotating shaft; 11, gear; 12, rack; 13, elastic filter cloth; 14, connecting box; 15, first basin angle gear; 16, second basin angle gear; 17, rotating ring; 18, scraper bar; 19, sliding rod; 20, connecting ring; 21, guide rod; 22, connecting frame ; 23. Connecting block; 24. First cam; 25. Strip hole; 26. Insertion hole; 27. Insertion block; 28. Sliding cart; 29. ​​Micro electric push rod; 30. Push block; 31. Connecting shaft; 32. Torsion spring; 33. Second rotating shaft; 34. Second hydraulic cylinder; 35. Connecting rod; 36. Connecting seat; 37. Lifting rod; 38. U-shaped mouth; 39. Connecting column; 40. Waist-shaped hole; 41. Rotating seat; 42. Second cam; 43. Rotating rod. DETAILED DESCRIPTION

[0022] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0023] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0024] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] Example 1 like Figures 1-8 As shown, the potassium fluoborate rapid filtration device comprises a frame 1, a cleaning mechanism, and a lifting assembly. Frame 1, the supporting structure of the entire device, is welded from steel and possesses sufficient strength and stability. Frame 1 is equipped with several key components to facilitate filtration, cleaning, cake removal, and maintenance of the filter frame 4.

[0026] Multiple filter frames 4 are mounted on the frame 1. Sliders 9 are located on both sides of the filter frames 4 and support the filter frames 4, allowing them to slide on the frame 1. Each filter frame 4 is secured with a filter plate 6 and an elastic filter cloth 13. A central tube 7 extends between the filter plates 6 and the elastic filter cloth 13, forming a cavity connected to an external air source. This air source can be an air compressor with an adjustable output pressure of 0.5-1.0 MPa. The elastic filter cloth 13 is expanded and repositioned by controlling the inlet and exhaust valves. When air enters the filter frames 4, the elastic filter cloth 13 expands, squeezing impurities between the two filter frames 4 and forcing the liquid within to flow out, thereby improving filtration efficiency. The elastic filter cloth 13 is a tetrafluoroethylene-perfluoroether rubber composite layer (thickness 1.2±0.2mm). The inner layer has a porosity of 60±5%, and the outer dense layer has a pressure resistance of ≥1.2 MPa.

[0027] A first hydraulic cylinder 2 is also mounted on the frame 1. A pressure plate 3 is bolted to the output end of the first hydraulic cylinder 2. The first hydraulic cylinder 2 is hydraulically driven, with an adjustable operating pressure of 10-20 MPa. By controlling the extension and retraction of the first hydraulic cylinder 2, the pressure plate 3 moves, pushing the multiple filter frames 4 in sequence to form a chamber between them, providing space for the filtration operation.

[0028] The cleaning mechanism is housed within the filter frame 4 and includes a transmission assembly that cooperates with the sliding carriage 28 and multiple connecting frames 8. The transmission assembly comprises a first rotating shaft 10, which is rotatably mounted on one side of the filter frame 4 via a bearing. A rotating ring 17 is mounted on the outer wall of the central tube 7, which is rotatably mounted via a bearing. This rotating ring 17 is embedded with a polytetrafluoroethylene lip seal (dynamic friction coefficient ≤ 0.1), with a sealing surface roughness Ra ≤ 0.8 μm. One end of the rotating ring 17 extends to one side of the filter plate 6. Multiple connecting frames 8 are arranged in a circular array on the outer wall of the rotating ring 17. A first basin angle tooth 15 is mounted on the outer wall of the rotating ring 17. A second basin angle tooth 16, meshing with the first basin angle tooth 15, is fixedly mounted on the outer wall of one end of the first rotating shaft 10. A gear 11 is also fixedly mounted on the outer wall of the first rotating shaft 10. A rack 12, which cooperates with the gear 11, is fixedly mounted on one side of the sliding carriage 28.

[0029] As the carriage 28 moves on the frame 1, the rack 12 contacts the gear 11, driving the gear 11 to rotate, which in turn drives the first rotating shaft 10. The rotation of the first rotating shaft 10, through the meshing first and second basin angle teeth 15 and 16, drives the rotating ring 17 to rotate. The rotation of the rotating ring 17 drives the multiple connecting frames 8 to rotate. During rotation, the connecting frames 8 agitate impurities between the filter frames 4, reducing clogging of the filter plates 6 and the elastic filter cloth 13.

[0030] A scraper bar 18 is provided within the connecting frame 8 for use with the transmission assembly. A sliding rod 19 corresponding to the connecting frame 8 is provided on one side of the rotating ring 17. One end of the sliding rod 19 is welded to the corresponding scraper bar 18, and the other ends of multiple sliding rods 19 are welded to the same connecting ring 20. A connecting box 14 is fixedly provided on one side of the filter plate 6. Two guide rods 21 are fixedly provided within the connecting box 14. A connecting frame 22 is provided on the outer walls of the two guide rods 21. A connecting block 23 is fixedly provided at the bottom end of the connecting frame 22. A first cam 24 located within the connecting block 23 is fixedly provided on the outer wall of the first rotating shaft 10.

[0031] When the first rotating shaft 10 rotates, the first cam 24 drives the connecting block 23 to move back and forth, the connecting block 23 drives the connecting frame 22 to slide along the guide rod 21, the connecting frame 22 pushes the connecting ring 20 to move, and the connecting ring 20 pushes the scraper 18 to move outward in the connecting frame 8 through the sliding rod 19, crushing the pressed cakes in turn. The scraper 18 is made of stainless steel, and its surface is polished with a hardness of HRC55-60. The surface of the scraper 18 is plasma-sprayed with a WC-10Co coating (thickness 50μm, hardness HV1200). A 15° spiral cutting edge is added to the front end of the scraper 18, which simultaneously generates circumferential shear force during radial feeding, which can effectively crush the pressed cake and reduce the wear on the connecting frame 8. The shape of the connecting frame 8 and the scraper 18 can also be arc-shaped, which can reduce the friction between the pressed cake and the pressed cake during the crushing process (because the filter plate 6 and the elastic filter cloth 13 squeeze the impurities, one side of the pressed cake is ring-shaped, and it can be gradually crushed from the inside to the outside during the crushing process), so that the crushing does not require a larger torque.

[0032] The sliding carriage 28 is provided with two push blocks 30, which are rotated by two connecting shafts 31. The outer wall of the connecting shaft 31 is provided with a torsion spring 32. The two ends of the torsion spring 32 respectively contact one side of the push block 30 and the inner wall of one side of the sliding carriage 28. Two micro electric push rods 29 corresponding to the push blocks 30 are fixed in the sliding carriage 28. The output ends of the micro electric push rods 29 contact the bottom of the push block 30.

[0033] When the sliding carriage 28 moves to the left, the micro electric push rod 29 on the right is started to extend, and in the process of extending, the lever principle is used to push the push block 30 on the right to flip over. At this time, when the sliding carriage 28 moves to the left, the push block 30 on the left can be resisted by the slider 9 and flipped downward. When the push block 30 moves away from the slider 9, the push block 30 is reset and flipped under the action of the torsion spring 32, and the flipping power is used to knock the slider 9, causing it to vibrate and reduce the blockage of the filter plate 6 and the elastic filter cloth 13. Conversely, starting the micro electric push rod 29 on the left to extend can achieve a similar effect. The stroke of the micro electric push rod 29 can be adjusted to 20-30mm, and the thrust can be adjusted to 50-100N to meet the knocking requirements.

[0034] The lifting assembly is disposed below the frame 1 and cooperates with the guide plate 5. The lifting assembly includes a connecting seat 36 disposed within the frame 1. A lifting rod 37 is slidably provided on the top of the connecting seat 36. The top of the lifting rod 37 has a U-shaped opening 38. The lifting rod 37 cooperates with one of the second rotating shafts 33 through a connector.

[0035] Example 2 Reference Figures 1-8The present invention provides a novel technical solution for a rapid filtration device for potassium fluoroborate. Two guide plates 5 are disposed at the bottom of a frame 1. A second hydraulic cylinder 34 is rotatably mounted on the frame 1 via a rotating shaft. The other end of the second hydraulic cylinder 34 is rotatably connected to one of the second rotating shafts 33. Second rotating shafts 33 are rotatably mounted on both sides of the frame 1 via bearings. The two guide plates 5 are respectively sleeved on the outer walls of the second rotating shafts 33. A common connecting rod 35 is rotatably connected between the two second rotating shafts 33.

[0036] Once the press cake is crushed, the first hydraulic cylinder 2 retracts, causing the pressing plate 3 to return to its original position. Simultaneously, two sliding carriages 28 move the two push blocks 30, which in turn push the filter frames 4 apart. The crushed press cake then falls onto the guide plate 5. The second hydraulic cylinder 34 retracts, rotating the second rotating shaft 33. This rotation, in turn, drives another second rotating shaft 33 through a connecting rod 35, causing the guide plate 5 to open downward, dropping the press cake onto the conveyor below. This conveyor utilizes a belt conveyor with an adjustable speed of 0.5-1.0 m / s to ensure smooth transport of the press cake.

[0037] The connecting part includes a second cam 42 fixedly sleeved on the outer wall of the second rotating shaft 33, a rotating seat 40 is welded to the top of the connecting seat 36, and a rotating rod 43 is provided on one side of the rotating seat 40 through the rotation of the rotating shaft. One end of the rotating rod 43 is in contact with the second cam 42, and the other end of the rotating rod 43 is provided with a waist-shaped hole 41, and a connecting column 39 is provided in the waist-shaped hole 41, and the connecting column 39 is welded to the lifting rod 37.

[0038] When the filter frame 4 needs maintenance, the sliding carriage 28 is used to push it to one end of the strip hole 25, and the insert 27 is pulled out of the insertion hole 26. At this time, as the second rotating shaft 33 rotates, the second cam 42 drives the rotating rod 43 to rotate. During the rotation of the rotating rod 43, the lever principle is used to drive the lifting rod 37 to move upward, lifting the corresponding filter frame 4 upward, separating the filter frame 4 from the slider 9, and facilitating the removal of the filter frame 4 from the frame 1 for maintenance.

[0039] A strip-shaped hole 25 is formed on one side of the frame 1, and the first rotating shaft 10 is positioned within this hole. A socket 26 is formed on the top of the frame 1, communicating with this hole 25. A plug 27 is inserted into this hole 26 to facilitate interference fit. When the filter frame 4 is operating normally, the plug 27 is inserted into the socket 26, sealing the hole 25 and preventing impurities from entering the hole 25 and interfering with the movement of the first rotating shaft 10 and the pressure plate 3. When maintenance is required on the filter frame 4, the plug 27 is removed from the socket 26, allowing the sliding carriage 28 to move the filter frame 4 to one end of the hole 25, facilitating lifting operations.

[0040] Potassium fluoroborate reaction slurry (solid content 22wt%, containing KBF4 crystal D) prepared by hydrofluoric acid-boric acid method50 =35μm, colloidal HBO21.8wt%, K2SiF60.9wt%) are pumped into the device after the temperature is controlled to 45±3℃ by the plate heat exchanger. Specific operation: 1. Temperature control system: A PT100 temperature sensor is installed at the feed port of the rack (1), which is linked to the heat exchanger regulating valve; a thermal oil coil (304 stainless steel, Φ25×2mm) is embedded in the rack wall to maintain the slurry temperature in the dynamic range of 42-52°C (boric acid solubility>15g / 100g water); 2. Anti-blocking operation process: drive the sliding car (28) to move back and forth at a speed of 0.6m / min, and the rack (12) drives the gear (11) to drive the connecting frame (8) to rotate at 18rpm to continuously crush the KBF4-K2SiF6 copolymer; when the filtration pressure difference rises to 0.42MPa (monitored by a digital pressure gauge), start 0.68MPa compressed air (filtered and dehydrated by a triplex) for 50 seconds, and the elastic filter cloth (13) expands and squeezes the slurry, so that the colloidal HBO2 escapes from the filter cloth micropores (pore size 10μm); 3. Cake processing: The scraper (18) is made of 2205 duplex steel and has a radial feed of 12 mm to crush the cake; the secondary air expansion extrusion (0.55 MPa / 40 seconds) further separates the crystal-encapsulated mother liquor.

[0041] When in use, the first hydraulic cylinder 2 is activated to extend, driving the pressing plate 3 to move, pushing the multiple filter frames 4 in sequence to form chambers between them; The liquid is pumped into multiple chambers by the pump body and filtered by the filter plate 6 and the elastic filter cloth 13. At the same time, the driving mechanism on the frame 1 is started to drive the sliding carriage 28 to move. When the sliding carriage 28 moves to the left, the micro-electric push rod 29 on the right is started to extend. During the extension process, the lever principle can be used to push the push block 30 on the right to flip. At this time, when the sliding carriage 28 moves to the left, the push block 30 on the left can be resisted by the slider 9 and flipped downward. When the push block 30 is away from the slider 9, the push block 30 can be reset and flipped under the force of the torsion spring 32, and the flipping power is used to knock the slider 9 to make it vibrate. Conversely, the micro-electric push rod 29 on the left is started to extend, which can reduce the blockage of the filter plate 6 and the elastic filter cloth 13. At the same time, the sliding carriage 28 can also drive the rack 12 to move during its movement. When the rack 12 contacts the gear 11, the gear 11 can be driven to rotate by the teeth. The rotation of the gear 11 can drive the first rotating shaft 10 to rotate. The first rotating shaft 10 can rotate by the meshing first basin angle teeth 15 and second basin angle teeth 16 to drive the rotating ring 17 to rotate. The rotation of the rotating ring 17 can drive the connecting frame 8 to rotate, thereby stirring the liquid in the chamber, which can further reduce the clogging of the filter plate 6 and the elastic filter cloth 13. When there are a lot of impurities in the chamber, the pressure of the conveying liquid increases to a certain value. At this time, the external air source is opened, allowing the air source to enter the filter frame 4, which can cause the elastic filter cloth 13 to expand, squeeze the impurities in the chamber, and make the liquid in the impurities flow out. After squeezing for a certain period of time, the air inlet valve is closed and the exhaust valve is opened to discharge the gas in the filter frame 4. At this time, the elastic filter cloth 13 can be reset under its own elastic force; After the elastic filter cloth 13 is reset, a certain space is formed between the press cake and the chamber, and the driving assembly is continued to drive the sliding carriage 28 to move, and the two micro-electric push rods 29 are driven to extend and the two push blocks 30 are flipped at the same time. The sliding carriage 28 moves to drive the first rotating shaft 10 to rotate, and the first rotating shaft 10 continues to drive the rotating ring 17 to rotate through the two meshed first basin angle teeth 15 and the second basin angle teeth 16, driving the connecting frame 8 to rotate. At the same time, during the rotation of the first rotating shaft 10, the connecting frame 22 can also be driven to reciprocate left and right through the first cam 24 and the connecting block 23. The movement of the connecting frame 22 can push the connecting ring 20 to move. During the movement of the connecting ring 20, the scraper 18 can be pushed outward in the connecting frame 8 through the sliding rod 19, thereby crushing the press cake in turn. After the cake is crushed, the external air source is turned on again to expand the elastic filter cloth 13, which squeezes the crushed cake again to further reduce the moisture in the cake. The sliding carriage 28 is then started again to move and drive the connecting frame 8 to rotate and crush the cake. After the extrusion is completed, the first hydraulic cylinder 2 is driven to retract and the pressure plate 3 is reset. At the same time, the two sliding carriages 28 are used to drive the two push blocks 30 to move so that they push the filter frames 4 away in sequence. At this time, the crushed cake can fall onto the guide plate 5. At the same time, the second hydraulic cylinder 34 is driven to retract, which can drive the second rotating shaft 33 to rotate. The rotation of the second rotating shaft 33 can drive another second rotating shaft 33 to rotate through the connecting rod 35, so that the guide plate 5 is opened downward, and the cake falls onto the conveyor below. When the filter frame 4 needs maintenance, the sliding vehicle 28 is used to push it to one end of the strip hole 25, and the plug 27 is pulled out from the socket 26. At this time, the second rotating shaft 33 can use the second cam 42 to pull the rotating rod 43 to rotate during the rotation process. During the rotation of the rotating rod 43, the lever principle can be used to drive the lifting rod 37 to move upward, which can lift the corresponding filter frame 4 upward, making it convenient to remove the filter frame 4 from the rack 1.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A rapid filtration device for potassium fluoroborate, characterized in that: include: Rack (1); A plurality of filter frames (4) are slidably arranged on the frame (1), and sliders (9) are provided on both sides of each filter frame (4), and the sliders (9) are slidably engaged with the frame (1); The filter plate (6) and the elastic filter cloth (13) are fixedly arranged in the filter frame (4), a central through pipe (7) is provided between the filter plate (6) and the elastic filter cloth (13), and a chamber between the two is connected to an external air source; A cleaning mechanism comprises a transmission assembly and a plurality of connecting frames (8), wherein a scraper strip (18) is provided in the connecting frame (8), and the transmission assembly is used to drive the connecting frame (8) to rotate; A sliding carriage (28) is provided on the frame (1), driven to move linearly by a driving assembly, and cooperates with a transmission assembly; The air source drives the elastic filter cloth (13) to expand, squeezing impurities between adjacent filter frames (4) to promote liquid outflow, while the sliding vehicle (28) moves to drive the transmission assembly to rotate, driving the connecting frame (8) to stir impurities and using the scraper (18) to crush the pressed cake, thereby reducing clogging of the filter plate (6) and the elastic filter cloth (13).

2. The rapid filtering device for potassium fluoroborate according to claim 1, wherein The transmission assembly comprises a first rotating shaft (10) and a rotating ring (17), wherein the first rotating shaft (10) passes through one side of the filter frame (4) and is rotatably arranged, and the rotating ring (17) is rotatably sleeved on the outer wall of the central tube (7), and one end extends to one side of the filter plate (6); A plurality of connecting frames (8) are arranged in an annular array on the outer wall of the rotating ring (17); the outer wall of the rotating ring (17) is provided with a first basin angle tooth (15); and one end of the first rotating shaft (10) is fixedly provided with a second basin angle tooth (16) meshing with the first basin angle tooth (15); A gear (11) is fixedly sleeved on the outer wall of the first rotating shaft (10), and a rack (12) meshing with the gear (11) is fixedly provided on one side of the sliding vehicle (28).

3. The rapid filtering device for potassium fluoroborate according to claim 2, wherein A plurality of sliding rods (19) are provided on one side of the rotating ring (17) for sliding movement, one end of each sliding rod (19) is fixedly connected to the scraper strip (18), and the other ends of the plurality of sliding rods (19) are fixedly connected to the same connecting ring (20); A connection box (14) is fixedly provided on one side of the filter plate (6), two guide rods (21) are provided in the connection box (14), and a connection frame (22) is slidably sleeved on the two guide rods (21), and the bottom end of the connection frame (22) is fixedly connected to a connection block (23); A first cam (24) is provided on the outer wall fixed sleeve of the first rotating shaft (10), and the first cam (24) is located in the connecting block (23); When the first rotating shaft (10) rotates, the first cam (24) drives the connecting block (23) to move back and forth, and pushes the connecting ring (20) through the connecting frame (22) to drive the scraper (18) to move outward and feed to crush the pressed cake.

4. The rapid filtering device for potassium fluoroborate according to claim 1, wherein The sliding vehicle (28) is rotated to set two push blocks (30) through two connecting shafts (31), and a torsion spring (32) is sleeved on the outer wall of the connecting shaft (31), and the two ends of the torsion spring (32) respectively contact the inner wall of the push block (30) and the sliding vehicle (28); Two micro electric push rods (29) are fixedly provided in the sliding vehicle (28), and the output ends of the micro electric push rods (29) abut against the bottom of the push block (30); When the micro electric push rod (29) is extended, the push block (30) is driven to flip through the lever mechanism, and the push block (30) can knock the slider (9) under the action of the torsion spring (32) to generate vibration, thereby reducing the clogging of the filter plate (6) and the elastic filter cloth (13).

5. The rapid filtering device for potassium fluoroborate according to claim 1, wherein Also includes: Two guide plates (5) are arranged at the bottom of the frame (1); The second hydraulic cylinder (34) is arranged on the frame (1) and is used to drive the guide plate (5) to flip to guide the pressed cake to be discharged.

6. The rapid filtering device for potassium fluoroborate according to claim 5, wherein Second rotating shafts (33) are rotatably provided on both sides of the frame (1) via bearings, two guide plates (5) are respectively sleeved on outer walls of the second rotating shafts (33), and the two second rotating shafts (33) are rotatably connected to the same connecting rod (35); One end of the second hydraulic cylinder (34) is rotatably mounted on the frame (1), and the other end is rotatably connected to one of the second rotating shafts (33).

7. The rapid filtering device for potassium fluoroborate according to claim 6, wherein It also includes a lifting assembly, the lifting assembly including a connecting seat (36) and a lifting rod (37), the connecting seat (36) is fixedly arranged in the frame (1), the lifting rod (37) is slidably arranged on the top of the connecting seat (36), and a U-shaped opening (38) is opened on the top; The lifting rod (37) cooperates with the second rotating shaft (33) via a connecting piece; When the second rotating shaft (33) turns over, the lifting rod (37) is driven to move upwards via the connecting member to lift the filter frame (4).

8. The rapid filtering device for potassium fluoroborate according to claim 7, wherein The connecting member includes a second cam (42), a rotating rod (43) and a connecting column (39); The second cam (42) is fixedly sleeved on the outer wall of the second rotating shaft (33); A rotating seat (40) is fixedly provided on the top of the connecting seat (36), and a rotating rod (43) is provided on one side of the rotating seat (40) to rotate via a rotating shaft, and one end of the rotating rod (43) contacts the second cam (42); A waist-shaped hole (41) is provided at the other end of the rotating rod (43), a connecting column (39) is provided in the waist-shaped hole (41), and the connecting column (39) is fixedly connected to the lifting rod (37); When the second rotating shaft (33) rotates, the second cam (42) drives the rotating rod (43) to rotate, and pushes the lifting rod (37) upward through the lever mechanism.

9. The rapid filtering device for potassium fluoroborate according to claim 1, wherein A strip-shaped hole (25) is provided on one side of the frame (1), and the first rotating shaft (10) is located in the strip-shaped hole (25); The top of the frame (1) is provided with a socket (26) communicating with the strip hole (25), and an insert block (27) is inserted into the socket (26) for blocking the strip hole (25).

10. A method for filtering potassium fluoroborate, using the rapid filtering device for potassium fluoroborate according to any one of claims 1 to 9, characterized in that: Including steps: S1. Potassium fluoroborate (KBF4) is prepared using the hydrofluoric acid-boric acid method: a 30-40 wt% hydrofluoric acid solution is reacted with boric acid (H3BO3) at a molar ratio of 1.8-2.2:1 at 60-85°C to produce fluoroboric acid (HBF4). A saturated potassium fluoride solution (40-50 wt%) is then added for a double decomposition reaction. The resulting system contains the target product, KBF4 crystals, unreacted boric acid particles, potassium fluoride byproduct, and a small amount of colloidal silicate impurities, forming a solid-liquid mixed slurry (solids content 15-35 wt%). The slurry needs to be separated to avoid excessive dissolution of KBF4 crystals in the mother liquor (solubility is about 4.5g / 100g water, 25°C) or recrystallization of impurities. The potassium fluoroborate reaction slurry prepared by the hydrofluoric acid-boric acid method is cooled to 40-60°C; deionized water is added to adjust the solid content to 15-30wt%, and after stirring, it is allowed to stand for 5-15 minutes to allow particles >200μm to settle. The first hydraulic cylinder (2) is started to extend, driving the pressure plate (3) to move to push the multiple filter frames (4) to form a chamber; S2, pumping the pretreated slurry into the chamber at a flow rate of 0.8-1.5 m³ / h, and filtering through the filter plate (6) and the elastic filter cloth (13); S3, driving the sliding car (28) to move, driving the transmission assembly to rotate through the rack (12) engaging the gear (11), and driving the connecting frame (8) to stir the impurities; S4, when impurities accumulate, the air source is turned on to expand the elastic filter cloth (13), squeezing the impurities to promote the outflow of the liquid; S5, after the gas source is turned off, the sliding carriage (28) is driven to move again, so that the scraper (18) moves outward to crush the pressed cake; S6, driving the second hydraulic cylinder (34) to retract and flipping the guide plate (5) to discharge the pressed cake; wherein, the stirring and squeezing process reduces the clogging of the filter plate (6) and the elastic filter cloth (13), thereby improving the filtering efficiency.

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