Fluorine-containing waste liquid villiaumite recycling device and method

Abstract

The invention discloses a fluorine-containing waste liquid villiaumite recycling device and method, and relates to the technical field of waste liquid treatment.The fluorine-containing waste liquid villiaumite recycling device comprises a protective shell, a water inlet pipe, a water outlet pipe, a recycling pipe and a reaction tank, the reaction tank is installed in the protective shell, a middle shaft pipe penetrates through the middle of the reaction tank, and the water inlet pipe penetrates through the protective shell to be connected with the top of the reaction tank; the water inlet pipe penetrates through the protective shell and is connected with the bottom of the reaction tank, the water outlet pipe penetrates through the protective shell and is connected with the bottom of the reaction tank, the recycling pipe is connected with the bottom of the middle shaft pipe, one end of the recycling pipe penetrates through the protective shell, and the middle shaft pipe is provided with wave discs which are located in the reaction tank. The hollow stirring shaft is used as a crystal discharge channel, a relatively closed transmission environment is created, the flow is simplified through the integrated design, and the shutdown risk caused by pipeline blockage and pump failure is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste liquid treatment, in particular to a fluorine salt recycling device and method for fluorine-containing waste liquid. BACKGROUND

[0002] In the production process of semiconductor, photovoltaic, fluorine chemical industry and metal surface treatment industries, a large amount of fluorine-containing waste liquid with complex components will be generated, which will cause serious harm to the environment if directly discharged. The mainstream treatment method for these fluorine-containing waste liquid is resource recycling, that is, by adding calcium salt, aluminum salt and other precipitants, the fluorine ions in the waste liquid are converted into calcium fluoride or cryolite, etc. valuable fluorine salt by-products for recycling.

[0003] The whole process not only takes a long time but also has low efficiency, and it is difficult to realize efficient, closed and continuous stable operation, therefore, it is of great significance to develop a high-efficiency waste water recycling device which can integrate the key processes in one body and realize seamless connection of reaction separation and discharge, for improving the treatment efficiency and resource recycling benefit of fluorine-containing waste liquid. SUMMARY

[0004] The present application relates to the technical field of waste liquid treatment, in particular to a fluorine salt recycling device and method for fluorine-containing waste liquid.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a fluorine salt recycling device and method for fluorine-containing waste liquid, comprising 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 part of the reaction tank, the water inlet pipe is connected with the top of the reaction tank through the protective shell, the water outlet pipe is connected with the bottom of the reaction tank through 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 inside the reaction tank.

[0006] Further, a driving motor is arranged on the top of the protective shell, the top of the middle shaft pipe is closed, the motor shaft of the driving motor is connected with the top of the middle shaft pipe through the protective shell, a plurality of upper through grooves are arranged on the middle shaft pipe, the plurality of upper through grooves are arranged near the top end inside the reaction tank, the plurality of upper through grooves are arranged in a ring shape and are uniformly distributed, the upper through grooves penetrate the pipe wall of the middle shaft pipe, a hanging rod is arranged on one side of each upper through groove, a plurality of bead chains are hung on the bottom of each hanging rod, the fluorine-containing waste liquid and the reactant are added into the reaction tank through the water inlet pipe at the same time, the driving motor is powered on, the middle shaft pipe starts to rotate, the middle shaft pipe drives the hanging rod and the wave disc to rotate, and the wave disc stirs and mixes the fluorine-containing waste liquid and the reactant.

[0007] Further, a plurality of upper sliding grooves are formed in the wall of the central shaft pipe, the number of the upper sliding grooves is the same as that of the upper through grooves, the upper sliding grooves are communicated with the upper through grooves, an upper gate plate is slidingly installed in each of the upper sliding grooves, the upper gate plate blocks the upper through groove, a spring is further arranged between each of the upper gate plates and the upper sliding groove, the spring abuts against the upper gate plate by elastic force, the upper gate plate blocks the upper through groove, and the fluorine-containing waste liquid and the reaction agent are prevented from leaking into the central shaft pipe through the upper through groove.

[0008] Further, a ring-shaped inner sliding groove is formed in the central shaft pipe, a circular hole is formed between the top of the inner sliding groove and the upper through groove, an inner sliding ring is sealingly and slidingly arranged in the inner sliding groove, a plurality of jacks are arranged on the upper portion of the inner sliding ring, the number of the jacks is the same as that of the upper through grooves, the jacks extend into the upper through grooves through the circular hole, when the inner sliding ring rises, the jacks are lifted, the upper gate plate is lifted by the jacks after the jacks pass through the circular hole, and the upper gate plate opens the upper through groove by overcoming the pushing force of the spring.

[0009] Further, a plurality of vertical sliding grooves are formed in the central shaft pipe, the vertical sliding grooves are communicated with the inner sliding groove, a plurality of pins are arranged on the inner sliding ring, the pins pass through the vertical sliding grooves, an outer ring is slidingly arranged on the outer wall of the central shaft pipe, the outer ring is connected with the pins, the wave disc is arranged on the outer ring, the wave disc is in the shape of an inverted cone, a plurality of arc-shaped stirring strips are arranged on the wave disc, the arc-shaped stirring strips are arranged in a circumferential manner, and a filter core plate is arranged between every two arc-shaped stirring strips, since the inner sliding ring and the outer ring are integrally connected through the pins, during the rotation of the central shaft pipe, the outer ring drives the wave disc to rotate, the arc-shaped stirring strips on the wave disc stir and mix the fluorine-containing waste liquid and the reaction agent, after a period of stirring, the liquid is allowed to stand for the fluorine salt to gradually precipitate.

[0010] Further, a sealing groove is formed in the central shaft pipe at the position corresponding to each of the vertical sliding grooves, a sealing belt is slidingly arranged in the sealing groove, the sealing belt blocks the vertical sliding groove, the pin passes through the sealing belt, and the sealing belt is sealingly arranged between the pin and the sealing belt, the sealing belt prevents the fluorine-containing waste liquid and the reaction agent from leaking into the central shaft pipe through the vertical sliding groove, and when the pin slides in the vertical sliding groove, the pin also drives the sealing belt to slide.

[0011] Further, a plurality of belt winding boxes are arranged on the top and the bottom of the central shaft pipe, all the belt winding boxes are located outside the reaction tank, both ends of each of the sealing belts are wound in the belt winding boxes, when the sealing belt slides upward in the sealing groove, the upper belt winding box winds the sealing belt, and the lower belt winding box unwinds the sealing belt, when the sealing belt slides downward in the sealing groove, the upper belt winding box unwinds the sealing belt, and the lower belt winding box winds the sealing belt, no matter how the sealing belt moves, the upper and lower belt winding boxes always keep the sealing belt in a tensioned state, and the sealing property of the sealing belt to the vertical sliding groove is ensured.

[0012] Further, the bottom of the central shaft pipe is rotationally and sealingly connected with an adapter air ring, the inner sliding groove is communicated with the adapter air ring through a fine hole, the adapter air ring is connected with an air pipe, the air pipe is connected with an air pump at the end away from the adapter air ring, after the fluorine salt is precipitated, the air pump inputs compressed gas into the adapter air ring through the air pipe, the compressed gas enters the inner sliding groove through the fine hole, the inner sliding ring slides upward, the wave disc is driven to rise, since the wave disc is in a state of rotating and rising, when the wave disc leaves the liquid surface of the waste liquid, the waste liquid is thrown out through the filter plate under the action of centrifugal force, and only the precipitated fluorine salt is left on the wave disc.

[0013] The recovery pipe is a T-shaped pipe, one end of the recovery pipe is rotationally and sealingly connected with the bottom of the central shaft pipe, a screw conveyor is rotationally installed in the recovery pipe, the rotation shaft of the screw conveyor penetrates the recovery pipe, the inside of the protective shell is provided with a servo motor, the motor shaft of the servo motor is connected with the rotation shaft of the screw conveyor, as the inner sliding ring continues to slide upward, the top rod pushes the upper gate upward, the upper through groove is opened, the pearl chain brushes the fluorine salt on the wave disc into the upper through groove along the guide direction of the arc-shaped stirring bar, the fluorine salt falls into the recovery pipe along the central shaft pipe, the servo motor is powered to drive the screw conveyor to rotate, and the screw conveyor pushes the fluorine salt out along the recovery pipe.

[0014] The application further provides a use method of the fluorine salt recovery and recycling device for fluorine-containing waste liquid. S1: the fluorine-containing waste liquid and the reaction agent enter the reaction tank; S2: the driving motor drives the central shaft pipe to rotate, the wave disc mixes and stirs the waste liquid, and the fluorine salt is precipitated and deposited; S3: the air pump is started to charge the inner sliding groove with air, the inner sliding ring slides upward, the wave disc rotates and rises, and the precipitated fluorine salt is centrifuged and dewatered; S4: the top rod opens the upper gate, the upper through groove is opened, and the pearl chain scrapes the fluorine salt on the wave disc into the central shaft pipe through the upper through groove; S5: the servo motor drives the screw conveyor to rotate, the fluorine salt is sent out through the recovery pipe, and the waste liquid is discharged through the water outlet pipe.

[0015] Compared with the prior art, the application has the following beneficial effects: 1. By integrating the precipitation reaction zone and the centrifugal filtration zone in a single reaction tank, the continuous operation of "reaction-separation" is realized, the traditional process steps such as slurry pumping and transfer are completely eliminated, the operation cycle is greatly shortened, and the equipment space utilization and production efficiency are improved.

[0016] 2. The hollow stirring shaft is used as a crystallization discharge channel, a relatively closed transmission environment is created, the integrated design simplifies the process, reduces the risk of shutdown caused by pipeline blockage and pump failure, and reduces manual intervention from dosing, reaction, separation to discharge, so that the operation is more stable and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the protective shell of the present invention; Figure 3 This is a schematic diagram of the internal structure of the reaction vessel of the present invention; Figure 4 This is a schematic diagram of the structure of the axial tube in this invention; Figure 5 This is a schematic diagram of the internal structure of the axial tube in this invention. Figure 1 ; Figure 6 This is a schematic diagram of the internal structure of the axial tube in this invention. Figure 2 .

[0018] 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

[0019] 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.

[0020] Example: Figures 1-6As shown, the present application provides a technical scheme, a fluorine-containing waste liquid fluorine salt recycling device, including protective shell 1, water inlet pipe 3, water outlet pipe 4, recovery pipe 5 and reaction tank 6, reaction tank 6 is installed in protective shell 1, the middle part of reaction tank 6 is provided with middle shaft pipe 9, water inlet pipe 3 penetrates protective shell 1 and is connected with the top of reaction tank 6, water outlet pipe 4 penetrates protective shell 1 and is connected with the bottom of reaction tank 6, recovery pipe 5 is connected with the bottom of middle shaft pipe 9, one end of recovery pipe 5 penetrates protective shell 1, wave plate 12 is installed on middle shaft pipe 9, wave plate 12 is located inside reaction tank 6, driving motor 2 is arranged on the top of protective shell 1, the top of middle shaft pipe 9 is closed, the motor shaft of driving motor 2 penetrates protective shell 1 and is connected with the top of middle shaft pipe 9, a plurality of upper through grooves 21 are formed in middle shaft pipe 9, the plurality of upper through grooves 21 are close to the inside top end of reaction tank 6, the plurality of upper through grooves 21 are annularly and uniformly arranged, the upper through grooves 21 penetrate the pipe wall of middle shaft pipe 9, each upper through groove 21 is provided with a hanging rod 10 on one side, a plurality of bead chains 11 are hung on the bottom of each hanging rod 10, fluorine-containing waste liquid and reaction agent are simultaneously added into reaction tank 6 through water inlet pipe 3, driving motor 2 is powered on, middle shaft pipe 9 starts to rotate, middle shaft pipe 9 drives hanging rod 10 and wave plate 12 to rotate, wave plate 12 stirs and mixes fluorine-containing waste liquid and reaction agent.

[0021] A plurality of upper sliding grooves 22 are formed in the pipe wall of middle shaft pipe 9, the number of upper sliding grooves 22 is the same as that of upper through grooves 21, upper sliding grooves 22 are communicated with upper through grooves 21, upper gate plates 14 are slidingly installed in each upper sliding groove 22, upper gate plates 14 block upper through grooves 21, springs 15 are further arranged between each upper gate plate 14 and upper sliding groove 22, an annular inner sliding groove 24 is formed in the inside of middle shaft pipe 9, a circular hole is formed between the top of inner sliding groove 24 and upper through groove 21, an inner sliding ring 17 is sealingly and slidingly arranged in inner sliding groove 24, a plurality of top rods 25 are arranged on the upper part of inner sliding ring 17, the number of top rods 25 is the same as that of upper through grooves 21, top rods 25 extend into upper through grooves 21 through the circular hole, springs 15 resist upper gate plates 14 by elastic force, so that upper gate plates 14 block upper through grooves 21 to prevent fluorine-containing waste liquid and reaction agent from leaking into the inside of middle shaft pipe 9 through upper through grooves 21, when inner sliding ring 17 rises, top rods 25 are lifted, upper gate plates 14 are lifted by top rods 25 after passing through the circular hole, upper gate plates 14 open upper through grooves 21 by overcoming the thrust force of springs 15.

[0022] A plurality of vertical sliding grooves 23 are formed on the central shaft tube 9, and the vertical sliding grooves 23 are communicated with the inner sliding grooves 24. A plurality of pins 18 are arranged on the inner sliding ring 17, and the pins 18 pass through the vertical sliding grooves 23. An outer ring 16 is arranged on the outer wall of the central shaft tube 9 in a sliding mode, and the outer ring 16 is connected with the pins 18. The wave plate 12 is arranged on the outer ring 16, and the wave plate 12 is in the shape of an inverted cone. A plurality of arc-shaped stirring strips are arranged on the wave plate 12 in a circumferential mode. A filter core plate 13 is arranged between every two arc-shaped stirring strips. A sealing groove is formed on the central shaft tube 9 at the position corresponding to each vertical sliding groove 23, and a sealing belt 19 is arranged in the sealing groove in a sliding mode. The sealing belt 19 seals the vertical sliding groove 23, and the pin 18 passes through the sealing belt 19. The pin 18 is sealed with the sealing belt 19. A plurality of belt winding boxes 20 are arranged on the top and bottom of the central shaft tube 9. All the belt winding boxes 20 are located on the outside of the reaction tank 6. The two ends of each sealing belt 19 are wound in the belt winding box 20.

[0023] Since the inner sliding ring 17 and the outer ring 16 are connected with each other through the plurality of pins 18, when the central shaft tube 9 rotates, the outer ring 16 drives the wave plate 12 to rotate. The arc-shaped stirring strips on the wave plate 12 stir and mix the fluorine-containing waste liquid and the reagent. After a period of stirring, the liquid is placed to wait for the fluorine salt to gradually precipitate. The sealing belt 19 prevents the fluorine-containing waste liquid and the reagent from leaking into the central shaft tube 9 through the vertical sliding groove 23. When the pin 18 slides in the vertical sliding groove 23, the pin 18 also drives the sealing belt 19 to slide. When the sealing belt 19 slides upward in the sealing groove, the upper belt winding box 20 winds the sealing belt 19, and the lower belt winding box 20 unwinds the sealing belt 19. When the sealing belt 19 slides downward in the sealing groove, the upper belt winding box 20 unwinds the sealing belt 19, and the lower belt winding box 20 winds the sealing belt 19. Regardless of the movement of the sealing belt 19, the upper and lower belt winding boxes 20 always keep the sealing belt 19 in a tensioned state, thereby ensuring the sealing property of the sealing belt 19 to the vertical sliding groove 23.

[0024] 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.

[0025] The operating method for a fluoride salt recovery and reuse device for fluoride-containing waste liquid includes the following steps: S1: Fluorine-containing waste liquid and reactants enter reaction tank 6; 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. 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. 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: 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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). All wave plates (12) are located inside the reaction tank (6).

2. The fluoride salt recovery and reuse device for fluoride-containing wastewater according to claim 1, characterized in that: 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).

3. The fluoride salt recovery and reuse device for fluoride-containing wastewater according to claim 2, characterized in that: 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).

4. The fluoride salt recovery and reuse device for fluoride-containing wastewater according to claim 3, 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.

5. The fluoride salt recovery and reuse device for fluoride-containing wastewater according to claim 4, 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.

6. The fluoride salt recovery and reuse device for fluoride-containing waste liquid according to claim 5, 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.

7. The fluoride salt recovery and reuse device for fluoride-containing wastewater according to claim 6, 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).

8. The fluoride salt recovery and reuse device for fluoride-containing waste liquid according to claim 7, 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).

9. A method of using the fluoride salt recovery and reuse device for fluoride-containing waste liquid as described in claim 8, characterized in that: Includes the following steps: S1: Fluorine-containing waste liquid and reactant enter the reaction tank through (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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