Fluoride salt recovery and reuse apparatus and method for fluorine-containing waste liquid

Abstract

The application discloses a fluorine-containing waste liquid fluorine salt recycling device and method, relates to the technical field of waste liquid treatment, and comprises a protective shell, a water inlet pipe, a water outlet pipe, a recovery pipe and a reaction tank, the reaction tank is installed in the protective shell, a middle shaft pipe is arranged in the middle of the reaction tank, the water inlet pipe is connected with the top of the reaction tank and penetrates the protective shell, the water outlet pipe is connected with the bottom of the reaction tank and penetrates the protective shell, the recovery pipe is connected with the bottom of the middle shaft pipe, one end of the recovery pipe penetrates the protective shell, a wave disc is installed on the middle shaft pipe, and the wave discs are located in the reaction tank. The fluorine-containing waste liquid and a reaction agent are simultaneously added into the reaction tank through the water inlet pipe, a hollow stirring shaft is used as a crystallization discharge channel, a relatively closed transmission environment is created, an integrated design simplifies the process, and the shutdown risk caused by pipeline blockage and pump failure is reduced.

Description

Technical Field

[0001] This invention relates to the field of waste liquid treatment technology, specifically to a device and method for recovering and reusing fluoride salts from fluoride-containing waste liquid. Background Technology

[0002] In the production processes of industries such as semiconductors, photovoltaics, fluorochemicals, and metal surface treatment, a large amount of complex fluorine-containing waste liquid is generated. Direct discharge of such waste liquid will cause serious harm to the environment. Currently, the mainstream treatment method for these fluorine-containing waste liquids is resource recycling, which involves adding precipitants such as calcium salts and aluminum salts to convert fluoride ions in the waste liquid into valuable fluoride salt by-products such as calcium fluoride or cryolite for recycling.

[0003] The entire process is not only time-consuming but also inefficient, making it difficult to achieve efficient, closed, continuous, and stable operation. Therefore, developing a high-efficiency wastewater recycling and treatment device that can integrate key processes and achieve seamless connection between reaction separation and discharge is of great significance for improving the treatment efficiency and resource recovery benefits of fluoride-containing waste liquid. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for recycling and reusing fluoride salts from fluoride-containing waste liquid, so as to solve the technical problem of low efficiency in waste liquid recycling and treatment in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fluoride-containing waste liquid fluoride salt recovery and reuse device, comprising a protective shell, an inlet pipe, an outlet pipe, a recovery pipe, and a reaction tank. The reaction tank is installed in the protective shell, and a central shaft pipe is provided through the middle of the reaction tank. The inlet pipe passes through the protective shell and is connected to the top of the reaction tank. The outlet pipe passes through the protective shell and is connected to the bottom of the reaction tank. The recovery pipe is connected to the bottom of the central shaft pipe, and one end of the recovery pipe passes through the protective shell. A pulsator is installed on the central shaft pipe, and all the pulsators are located inside the reaction tank.

[0006] Furthermore, a drive motor is installed at the top of the protective shell, and the top of the central tube is closed. The motor shaft of the drive motor passes through the protective shell and connects to the top of the central tube. Several upper through slots are opened on the central tube, and the upper through slots are close to the top of the inside of the reaction tank. The upper through slots are evenly distributed in a ring and penetrate the tube wall of the central tube. A hanging rod is installed on one side of each upper through slot, and several bead chains are hung at the bottom of each hanging rod. The fluorine-containing waste liquid and the reactant are simultaneously added to the reaction tank through the water inlet pipe. When the drive motor is powered on, the central tube starts to rotate. The central tube drives the hanging rod and the pulsator to rotate, and the pulsator stirs and mixes the fluorine-containing waste liquid and the reactant.

[0007] Furthermore, the central tube has several upper sliding grooves in its wall, the number of which is the same as the number of upper through grooves. The upper sliding grooves are connected to the upper through grooves. Each upper sliding groove has an upper gate plate slidably installed in it, which blocks the upper through groove. A spring is also provided between each upper gate plate and the upper sliding groove. The spring uses its elasticity to press against the upper gate plate, so that the upper gate plate blocks the upper through groove, preventing fluorine-containing waste liquid and reactants from leaking into the interior of the central tube through the upper through groove.

[0008] Furthermore, the inner shaft tube has an annular inner sliding groove, and a circular hole is formed between the top of the inner sliding groove and the upper through groove. An inner sliding ring is slidably sealed in the inner sliding groove, and several push rods are provided on the upper part of the inner sliding ring. The number of push rods is the same as the number of upper through grooves. The push rods extend into the upper through groove through the circular hole. When the inner sliding ring rises, the push rods rise accordingly. After the push rods pass through the circular hole, they push the upper gate plate upward. The upper gate plate overcomes the pushing force of the spring and opens the upper through groove.

[0009] Furthermore, the central tube has several vertical sliding grooves connected to the inner sliding groove. The inner sliding ring has several pins that pass through the vertical sliding grooves. An outer ring is slidably mounted on the outer wall of the central tube and connected to the pins. The wave plate is mounted on the outer ring and is in the shape of an inverted cone. Several arc-shaped stirring bars are arranged on the wave plate in a circumferential pattern. A filter plate is placed between every two arc-shaped stirring bars. Since the inner sliding ring and the outer ring are connected as a whole by several pins, the outer ring drives the wave plate to rotate during the rotation of the central tube. The arc-shaped stirring bars on the wave plate stir and mix the fluorine-containing waste liquid and the reactant. After a period of stirring, the liquid is left to stand and allow the fluoride salts to gradually precipitate.

[0010] Furthermore, a sealing groove is provided at the position of each vertical sliding groove on the central tube, and a sealing strip is slidably arranged in the sealing groove. The sealing strip seals the vertical sliding groove, and the pin passes through the sealing strip. The pin and the sealing strip are sealed together. The sealing strip prevents fluorine-containing waste liquid and reactants from leaking into the interior of the central tube through the vertical sliding groove. When the pin slides in the vertical sliding groove, the pin will also drive the sealing strip to slide.

[0011] Furthermore, several tape reels are installed at the top and bottom of the central tube. All the tape reels are located on the outside of the reaction vessel. Both ends of each sealing tape are wound into the tape reel. When the sealing tape slides upward in the sealing groove, the upper tape reel winds up the sealing tape, and the lower tape reel releases the sealing tape. When the sealing tape slides downward in the sealing groove, the upper tape reel releases the sealing tape, and the lower tape reel winds up the sealing tape. No matter how the sealing tape moves, the tape reels at both ends always keep the sealing tape in a taut state to ensure the sealing performance of the sealing tape to the vertical sliding groove.

[0012] Furthermore, a transfer gas ring is rotatably sealed at the bottom of the central tube. The inner sliding groove and the transfer gas ring are connected through a fine hole. An air pipe is connected to the transfer gas ring, and an air pump is connected to the end of the air pipe away from the transfer gas ring. After the fluoride salt precipitates, the air pump inputs compressed gas into the transfer gas ring through the air pipe. The compressed gas enters the inner sliding groove through the fine hole, causing the inner sliding ring to slide upward. The pulsator is driven to rise. Since the pulsator is in a state of rotating and rising, when the pulsator leaves the surface of the waste liquid, the waste liquid is thrown out through the filter plate by centrifugal force, leaving only the precipitated fluoride salt on the pulsator.

[0013] The recovery pipe is a T-shaped pipe, with one end rotatably sealed to the bottom of the central shaft pipe. An auger is rotatably installed inside the recovery pipe, and the shaft of the auger passes through the recovery pipe. A servo motor is installed inside the protective shell, and the motor shaft of the servo motor is connected to the shaft of the auger. As the inner slip ring continues to slide upward, the top rod pushes the upper gate upward, opening the upper passage. The bead chain brushes the fluoride salt on the pulsator into the upper passage along the guide direction of the arc-shaped stirring bar. The fluoride salt falls into the recovery pipe along the central shaft pipe. The servo motor is powered on, driving the auger to rotate. The auger pushes the fluoride salt out along the recovery pipe, and the residual waste liquid in the reaction tank is discharged from the outlet pipe.

[0014] The operating method for a fluoride salt recovery and reuse device for fluoride-containing waste liquid includes the following steps:

[0015] S1: Fluorine-containing waste liquid and reactants enter the reaction tank through the inlet pipe;

[0016] S2: The drive motor drives the central shaft tube to rotate, and the wave plate mixes and stirs the waste liquid, causing fluoride salts to precipitate.

[0017] S3: The air pump starts and fills the inner slide groove with air. The inner slip ring slides upward and the pulsator rotates and rises to centrifuge and dehydrate the precipitated fluoride.

[0018] S4: The push rod opens the upper gate, the upper through groove opens, and the bead chain scrapes the fluoride salt on the wave plate into the interior of the central tube through the upper through groove;

[0019] S5: The servo motor drives the auger to rotate, the fluoride salt is sent out through the recovery pipe, and the waste liquid is discharged through the outlet pipe.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. By integrating the sedimentation reaction zone and the centrifugal filtration zone into a single reaction tank, continuous "reaction-separation" operation is achieved, completely eliminating the slurry pumping and transfer links in the traditional process, greatly shortening the operation cycle, and improving equipment space utilization and production efficiency.

[0022] 2. The use of a hollow stirring shaft as a crystallization discharge channel creates a relatively closed transmission environment. The integrated design simplifies the process and reduces the risk of downtime due to pipe blockage or pump failure. The process from dosing, reaction, separation to discharge reduces manual intervention and makes the operation more stable and reliable. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure of the protective shell of the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of the reaction vessel of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the axial tube in this invention;

[0027] Figure 5 This is a schematic diagram of the internal structure of the axial tube in this invention. Figure 1 ;

[0028] Figure 6 This is a schematic diagram of the internal structure of the axial tube in this invention. Figure 2 .

[0029] In the diagram: 1. Protective outer shell; 2. Drive motor; 3. Inlet pipe; 4. Outlet pipe; 5. Recovery pipe; 6. Reaction tank; 7. Adapter gas ring; 8. Gas pipe; 9. Central shaft tube; 10. Hanging rod; 11. Bead chain; 12. Wave plate; 13. Filter plate; 14. Upper gate; 15. Spring; 16. Outer ring; 17. Inner slip ring; 18. Pin; 19. Sealing tape; 20. Reel box; 21. Upper through groove; 22. Upper sliding groove; 23. Vertical sliding groove; 24. Inner sliding groove; 25. Top rod; 26. Servo motor; 27. Screwdriver. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example: Figures 1-6As shown, this invention provides a technical solution for a fluoride-containing waste liquid fluoride salt recovery and reuse device, including a protective shell 1, an inlet pipe 3, an outlet pipe 4, a recovery pipe 5, and a reaction tank 6. The reaction tank 6 is installed in the protective shell 1. A central shaft pipe 9 is installed through the middle of the reaction tank 6. The inlet pipe 3 passes through the protective shell 1 and connects to the top of the reaction tank 6. The outlet pipe 4 passes through the protective shell 1 and connects to the bottom of the reaction tank 6. The recovery pipe 5 is connected to the bottom of the central shaft pipe 9, and one end of the recovery pipe 5 passes through the protective shell 1. A pulsator 12 is installed on the central shaft pipe 9. The pulsator 12 is located inside the reaction tank 6. A drive motor 2 is installed on the top of the protective shell 1. The reactor is partially enclosed. The motor shaft of the drive motor 2 passes through the protective shell 1 and connects to the top of the central tube 9. Several upper through slots 21 are opened on the central tube 9. The upper through slots 21 are close to the top of the inside of the reaction tank 6 and are evenly distributed in a ring. The upper through slots 21 penetrate the tube wall of the central tube 9. A hanging rod 10 is provided on one side of each upper through slot 21. Several bead chains 11 are hung at the bottom of each hanging rod 10. Fluorine-containing waste liquid and reactant are added to the reaction tank 6 at the same time through the water inlet pipe 3. When the drive motor 2 is powered on, the central tube 9 starts to rotate. The central tube 9 drives the hanging rod 10 and the pulsator 12 to rotate. The pulsator 12 stirs and mixes the fluorine-containing waste liquid and reactant.

[0032] Several upper sliding grooves 22 are formed in the wall of the central tube 9. The number of upper sliding grooves 22 is the same as the number of upper through grooves 21. The upper sliding grooves 22 are connected to the upper through grooves 21. An upper gate plate 14 is slidably installed in each upper sliding groove 22 to block the upper through groove 21. A spring 15 is also provided between each upper gate plate 14 and the upper sliding groove 22. An annular inner sliding groove 24 is formed inside the central tube 9. A round hole is formed between the top of the inner sliding groove 24 and the upper through groove 21. An inner sliding ring 17 is slidably and sealingly installed in the inner sliding groove 24. The inner slip ring 17 is provided with several push rods 25 on its upper part. The number of push rods 25 is the same as the number of upper through grooves 21. The push rods 25 extend into the upper through grooves 21 through the round holes. The spring 15 uses its elastic force to push against the upper gate 14, so that the upper gate 14 blocks the upper through grooves 21, preventing fluorine-containing waste liquid and reactants from leaking into the central shaft tube 9 through the upper through grooves 21. When the inner slip ring 17 rises, the push rods 25 rise accordingly. After the push rods 25 pass through the round holes, they push the upper gate 14 upward. The upper gate 14 overcomes the pushing force of the spring 15 and opens the upper through grooves 21.

[0033] Several vertical sliding grooves 23 are provided on the central tube 9, which are connected to the inner sliding groove 24. Several pins 18 are provided on the inner sliding ring 17, and the pins 18 pass through the vertical sliding grooves 23. An outer ring 16 is slidably provided on the outer wall of the central tube 9, and the outer ring 16 is connected to the pins 18. The pulsator 12 is installed on the outer ring 16. The pulsator 12 is in the shape of an inverted cone, and several arc-shaped stirring bars are provided on the pulsator 12. The arc-shaped stirring bars are evenly distributed in a circumferential pattern. Every two arc-shaped stirring bars A filter plate 13 is provided between the two. A sealing groove is opened at the position of each vertical sliding groove 23 in the central tube 9. A sealing strip 19 is slidably arranged in the sealing groove. The sealing strip 19 seals the vertical sliding groove 23. A pin 18 passes through the sealing strip 19 and a seal is formed between the pin 18 and the sealing strip 19. Several tape reel boxes 20 are installed at the top and bottom of the central tube 9. All tape reel boxes 20 are located on the outside of the reaction vessel 6. Both ends of each sealing strip 19 are wound in the tape reel box 20.

[0034] Since the inner slip ring 17 and the outer ring 16 are integrally connected by several pins 18, during the rotation of the central shaft tube 9, the outer ring 16 drives the pulsator 12 to rotate. The arc-shaped stirring bar on the pulsator 12 stirs and mixes the fluorine-containing waste liquid and the reactant. After a period of stirring, the liquid is left to stand and wait for the fluoride salts to gradually precipitate. The sealing strip 19 prevents the fluorine-containing waste liquid and the reactant from leaking into the interior of the central shaft tube 9 through the vertical sliding groove 23. When the pins 18 slide in the vertical sliding groove 23, the pins 18 will also drive the pulsator to rotate. When the sealing strip 19 slides upward in the sealing groove, the upper tape cassette 20 winds up the sealing strip 19 and the lower tape cassette 20 releases the sealing strip 19. When the sealing strip 19 slides downward in the sealing groove, the upper tape cassette 20 releases the sealing strip 19 and the lower tape cassette 20 winds up the sealing strip 19. No matter how the sealing strip 19 moves, the tape cassettes 20 at both ends always keep the sealing strip 19 in a taut state to ensure the sealing performance of the sealing strip 19 to the vertical sliding groove 23.

[0035] A transition gas ring 7 is rotatably sealed at the bottom of the central shaft tube 9. The inner slide groove 24 is connected to the transition gas ring 7 through a fine hole. An air pipe 8 is connected to the transition gas ring 7. An air pump (not shown in the figure) is connected to the end of the air pipe 8 away from the transition gas ring 7. The recovery pipe 5 is a T-shaped pipe. One end of the recovery pipe 5 is rotatably sealed at the bottom of the central shaft tube 9. An auger 27 is rotatably installed inside the recovery pipe 5. The shaft of the auger 27 passes through the recovery pipe 5. A servo motor 26 is installed inside the protective shell 1. The motor shaft of the servo motor 26 is connected to the shaft of the auger 27. After the fluoride salt precipitate is released, the air pump inputs compressed gas into the transition gas ring 7 through the air pipe 8. The compressed gas enters the inner slide groove 24 through the fine hole. In the process, the inner slip ring 17 slides upward, and the pulsator 12 is driven to rise. Since the pulsator 12 is in a state of rotating and rising, when the pulsator 12 leaves the surface of the waste liquid, the waste liquid is thrown out through the filter plate 13 under the action of centrifugal force, leaving only the precipitated fluoride salt on the pulsator 12. As the inner slip ring 17 continues to slide upward, the top rod 25 pushes the upper gate 14 upward, and the upper passage 21 is opened. The bead chain 11 brushes the fluoride salt on the pulsator 12 into the upper passage 21 along the guide direction of the arc-shaped stirring bar. The fluoride salt falls into the recovery pipe 5 along the central shaft tube 9. The servo motor 26 is powered on to drive the auger 27 to rotate. The auger 27 pushes the fluoride salt out along the recovery pipe 5, and the residual waste liquid in the reaction tank 6 is discharged from the outlet pipe 4.

[0036] The operating method for a fluoride salt recovery and reuse device for fluoride-containing waste liquid includes the following steps:

[0037] S1: Fluorine-containing waste liquid and reactant enter reaction tank 6 through water inlet pipe 3;

[0038] S2: Drive motor 2 drives central tube 9 to rotate, and wave plate 12 mixes and stirs the waste liquid, causing fluoride salts to precipitate.

[0039] S3: The air pump starts to fill the inner slide groove 24 with air, the inner slip ring 17 slides upward, the pulsator 12 rotates and rises, and the precipitated fluoride salt is centrifuged and dehydrated.

[0040] S4: The top rod 25 pushes open the upper gate 14, the upper through groove 21 opens, and the bead chain 11 scrapes the fluoride salt on the wave plate 12 into the interior of the central tube 9 through the upper through groove 21.

[0041] S5: Servo motor 26 drives auger 27 to rotate, fluoride salt is sent out through recovery pipe 5, and waste liquid is discharged through water outlet pipe 4.

[0042] The working principle of this invention is as follows: Fluorine-containing waste liquid and reactant are simultaneously added to reaction tank 6 through water inlet pipe 3. Drive motor 2 is powered on, and central shaft tube 9 starts to rotate. Central shaft tube 9 drives hanging rod 10 and pulsator 12 to rotate. Pulsator 12 stirs and mixes fluorine-containing waste liquid and reactant. Spring 15 uses its elasticity to press against upper gate plate 14, so that upper gate plate 14 blocks upper through groove 21, preventing fluorine-containing waste liquid and reactant from leaking into the interior of central shaft tube 9 through upper through groove 21. When inner slip ring 17 rises, push rod 25 rises accordingly. After push rod 25 passes through round hole, it pushes upper gate plate 14 upward. Upper gate plate 14 overcomes the pushing force of spring 15 and opens upper through groove 21.

[0043] Since the inner slip ring 17 and the outer ring 16 are integrally connected by several pins 18, during the rotation of the central shaft tube 9, the outer ring 16 drives the pulsator 12 to rotate. The arc-shaped stirring bar on the pulsator 12 stirs and mixes the fluorine-containing waste liquid and the reactant. After a period of stirring, the liquid is left to stand and wait for the fluoride salts to gradually precipitate. The sealing strip 19 prevents the fluorine-containing waste liquid and the reactant from leaking into the interior of the central shaft tube 9 through the vertical sliding groove 23. When the pins 18 slide in the vertical sliding groove 23, the pins 18 will also drive the pulsator to rotate. When the sealing strip 19 slides upward in the sealing groove, the upper tape cassette 20 winds up the sealing strip 19 and the lower tape cassette 20 releases the sealing strip 19. When the sealing strip 19 slides downward in the sealing groove, the upper tape cassette 20 releases the sealing strip 19 and the lower tape cassette 20 winds up the sealing strip 19. No matter how the sealing strip 19 moves, the tape cassettes 20 at both ends always keep the sealing strip 19 in a taut state to ensure the sealing performance of the sealing strip 19 to the vertical sliding groove 23.

[0044] After the fluoride salt precipitates, the air pump inputs compressed gas into the transfer air ring 7 through the air pipe 8. The compressed gas enters the inner sliding groove 24 through the fine hole, causing the inner sliding ring 17 to slide upward. The pulsator 12 is driven to rise. Since the pulsator 12 is in a state of rotating and rising, when the pulsator 12 leaves the surface of the waste liquid, the waste liquid is thrown out through the filter plate 13 under the action of centrifugal force. Only the precipitated fluoride salt is left on the pulsator 12. As the inner sliding ring 17 continues to slide upward, the top rod 25 pushes the upper gate 14 upward, and the upper passage 21 is opened. The bead chain 11 brushes the fluoride salt on the pulsator 12 into the upper passage 21 along the guide direction of the arc-shaped stirring bar. The fluoride salt falls into the recovery pipe 5 along the central shaft tube 9. The servo motor 26 is powered on to drive the auger 27 to rotate. The auger 27 pushes the fluoride salt out along the recovery pipe 5.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A device for recovering and reusing fluoride salts from fluoride-containing wastewater, characterized in that: The system includes a protective shell (1), an inlet pipe (3), an outlet pipe (4), a recovery pipe (5), and a reaction tank (6). The reaction tank (6) is installed in the protective shell (1). A central shaft pipe (9) is installed through the middle of the reaction tank (6). The inlet pipe (3) passes through the protective shell (1) and is connected to the top of the reaction tank (6). The outlet pipe (4) passes through the protective shell (1) and is connected to the bottom of the reaction tank (6). The recovery pipe (5) is connected to the bottom of the central shaft pipe (9). One end of the recovery pipe (5) passes through the protective shell (1). A wave plate (12) is installed on the central shaft pipe (9). The wave plates (12) are all located inside the reaction tank (6). The protective shell (1) is equipped with a drive motor (2) at the top, and the top of the central tube (9) is closed. The motor shaft of the drive motor (2) passes through the protective shell (1) and connects to the top of the central tube (9). Several upper through slots (21) are opened on the central tube (9). Several upper through slots (21) are close to the top of the inside of the reaction vessel (6). Several upper through slots (21) are evenly distributed in a ring. The upper through slots (21) penetrate the tube wall of the central tube (9). A hanging rod (10) is provided on one side of each upper through slot (21). Several bead chains (11) are hung at the bottom of each hanging rod (10). The central tube (9) has several upper sliding grooves (22) in its tube wall. The number of upper sliding grooves (22) is the same as the number of upper through grooves (21). The upper sliding grooves (22) are connected to the upper through grooves (21). An upper gate plate (14) is slidably installed in each upper sliding groove (22). The upper gate plate (14) blocks the upper through groove (21). A spring (15) is also provided between each upper gate plate (14) and the upper sliding groove (22).

2. The fluoride salt recovery and reuse device for fluoride-containing wastewater according to claim 1, characterized in that: The inner shaft tube (9) has an annular inner groove (24) inside. A round hole is provided between the top of the inner groove (24) and the upper through groove (21). An inner sliding ring (17) is provided in the inner groove (24) for sealing and sliding. Several push rods (25) are provided on the upper part of the inner sliding ring (17). The number of push rods (25) is the same as the number of upper through grooves (21). The push rods (25) extend into the upper through groove (21) through the round hole.

3. The fluoride salt recovery and reuse device for fluoride-containing waste liquid according to claim 2, characterized in that: The central tube (9) is provided with several vertical sliding grooves (23), which are connected to the inner sliding groove (24). The inner sliding ring (17) is provided with several pins (18), which pass through the vertical sliding grooves (23). An outer ring (16) is slidably provided on the outer wall of the central tube (9), which is connected to the pins (18). The wave plate (12) is installed on the outer ring (16). The wave plate (12) is in the shape of an inverted cone. Several arc-shaped stirring strips are provided on the wave plate (12). The arc-shaped stirring strips are evenly distributed in a circumferential shape. A filter plate (13) is provided between every two arc-shaped stirring strips.

4. The fluoride salt recovery and reuse device for fluoride-containing wastewater according to claim 3, characterized in that: The central tube (9) has a sealing groove at the position of each vertical sliding groove (23). A sealing strip (19) is slidably arranged in the sealing groove. The sealing strip (19) seals the vertical sliding groove (23). The pin (18) passes through the sealing strip (19), and the pin (18) and the sealing strip (19) are sealed together.

5. The fluoride salt recovery and reuse device for fluoride-containing wastewater according to claim 4, characterized in that: Several tape reels (20) are installed at the top and bottom of the central tube (9). All of the tape reels (20) are located outside the reaction vessel (6), and both ends of each sealing tape (19) are wound in the tape reel (20).

6. The fluoride salt recovery and reuse device for fluoride-containing waste liquid according to claim 5, characterized in that: The bottom of the central tube (9) is rotatably sealed with a transition air ring (7), the inner slide groove (24) and the transition air ring (7) are connected through a fine hole, the transition air ring (7) is connected with an air pipe (8), and the end of the air pipe (8) away from the transition air ring (7) is connected with an air pump. The recovery tube (5) is a T-shaped tube. One end of the recovery tube (5) is rotatably sealed to the bottom of the central tube (9). An auger (27) is rotatably installed inside the recovery tube (5). The shaft of the auger (27) passes through the recovery tube (5). A servo motor (26) is installed inside the protective shell (1). The motor shaft of the servo motor (26) is connected to the shaft of the auger (27).

7. A method of using the fluoride salt recovery and reuse device for fluoride-containing waste liquid as described in claim 6, characterized in that: Includes the following steps: S1: Fluorine-containing waste liquid and reactant enter the reaction tank through the inlet pipe (3); S2: The drive motor (2) drives the central tube (9) to rotate, and the wave plate (12) mixes and stirs the waste liquid, causing fluoride salts to precipitate. S3: The air pump starts to fill the inner slide groove (24) with air, the inner slip ring (17) slides upward, and the wave plate (12) rotates and rises to centrifuge and dehydrate the precipitated fluoride salt; S4: The top rod (25) pushes open the upper gate (14), the upper through groove (21) opens, and the bead chain (11) scrapes the fluoride salt on the wave plate (12) into the interior of the central tube (9) through the upper through groove (21); S5: The servo motor (26) drives the auger (27) to rotate, the fluoride salt is sent out through the recovery pipe (5), and the waste liquid is discharged through the outlet pipe (4).

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