Crystallization and dehydration device for lithium hexafluorophosphate preparation
By using a multi-stage dynamic dehydration device, which combines a stirring shaft, auger, and fan with a dryer and cooling system, the problem of slow dehydration speed in the preparation of lithium hexafluorophosphate has been solved, thereby improving production efficiency and crystal purity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2026-03-17
AI Technical Summary
In the current lithium hexafluorophosphate preparation process, the crystallization and dehydration methods are limited, resulting in slow dehydration speed and affecting production efficiency.
A multi-stage dynamic dehydration device is adopted, which includes a stirring shaft, an auger and a fan working together. Multi-stage dehydration is achieved through stirring, air power and auger conveying, and combined with a dryer and cooling system to improve dehydration efficiency.
This method achieves efficient dehydration of lithium hexafluorophosphate, improving production efficiency and energy utilization, and ensuring the dryness and purity of the crystals.
Smart Images
Figure CN223995448U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium battery technology, specifically to a device for preparing, crystallizing, and dehydrating lithium hexafluorophosphate. Background Technology
[0002] Lithium hexafluorophosphate is the core solute in lithium-ion battery electrolytes, and its performance directly affects the battery's energy density, cycle life, and safety performance. Crystallization and dehydration are key steps in its preparation process.
[0003] The crystallization and dehydration device in the lithium hexafluorophosphate preparation process achieves efficient and uniform crystallization and dehydration through the synergistic effect of the crystallization kettle, circulation device, temperature control system and molecular sieve dehydration system.
[0004] Existing devices may have a single dehydration method, relying only on simple natural air drying or simple wind blowing, resulting in slow dehydration speed and excessively long dehydration time for lithium hexafluorophosphate crystallization, which affects the overall production efficiency. Therefore, a lithium hexafluorophosphate preparation crystallization dehydration device is proposed to address the above problems. Summary of the Invention
[0005] To address the shortcomings of existing technologies, which may rely on a single dehydration method, such as simple natural air drying or simple wind blowing, resulting in slow dehydration speed and excessively long dehydration time for lithium hexafluorophosphate crystallization, thus affecting overall production efficiency, this invention proposes a lithium hexafluorophosphate preparation crystallization dehydration device.
[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: A lithium hexafluorophosphate preparation crystallization and dehydration device of this utility model includes a base. A crystallization vessel is fixedly installed on the upper part of one end of the base. An air inlet pipe and a feed pipe are sequentially fixedly connected to one side of the top center of the crystallization vessel, and a return pipe and a connecting pipe are sequentially fixedly connected to the other side. A collection pipe is fixedly installed at the bottom of the crystallization vessel. A stirring shaft is rotatably installed inside the crystallization vessel. The lower end of the stirring shaft extends into the collection pipe. Stirring rods are arranged and fixedly installed in an array on both sides of the upper end of the stirring shaft. A scraper is fixedly installed at the end of the stirring rod. A piston is provided at the lower end of the stirring shaft and slidably installed inside the lower end of the collection pipe. A discharge pipe is fixedly connected to one side of the lower end of the collection pipe. A dehydration tank is provided on one side of the bottom of the crystallization vessel and fixedly installed on the base. One end of the discharge pipe is fixedly connected to one end of the dehydration tank and extends into it. A wind duct is fixedly installed on the top of the dehydration tank. A fan is fixedly installed inside the air duct. A partition is fixedly installed inside the dehydration tank on one side of the lower part of the air duct. An air outlet plate is fixedly installed inside the upper part of the dehydration tank on the upper side of the partition plate, and multiple air holes are arrayed on the air outlet plate. An arc-shaped screen plate is fixedly installed between the partition plate and the dehydration tank below the air outlet plate. A material inlet is opened in the partition plate, and an auger is rotatably installed in the material inlet. Both ends of the auger are rotatably installed in the dehydration tank through bearings. A second motor is fixedly installed at one end of the dehydration tank, and the rotating shaft of the second motor is fixedly connected to one end of the auger. The other end of the connecting pipe is fixedly connected to the air duct, and the other end of the return pipe is fixedly connected to the top of the other end of the dehydration tank. The fan generates air force in the air duct, which is blown towards the crystallizer through the air outlet plate. At the same time, the auger rotates in the partition plate to transport the crystallizer. During the transport process, the crystallizer is continuously subjected to air force, which increases the contact time and area between the crystallizer and the air force, and greatly improves the dehydration efficiency.
[0007] Preferably, an outer shell is fixedly installed on the outside of the crystallization vessel, and a cooling chamber is formed between the outer shell and the outer wall of the crystallization vessel. A liquid inlet pipe is fixedly connected to one side of the lower end of the outer shell, and a liquid outlet pipe is fixedly connected to the upper end of the other side. Coolant is introduced through the liquid inlet pipe, which can accurately control the temperature of the crystallization vessel. The coolant is circulated in the cooling chamber, which can reduce the consumption of coolant, reduce production costs, and reduce environmental pollution.
[0008] Preferably, a first motor is fixedly installed at the center of the top of the crystallization vessel. The rotating shaft of the first motor is fixedly connected to one end of the stirring shaft. A rotating spiral is rotatably installed inside the upper end of the collecting pipe and welded to the lower end of the stirring shaft. The first motor, the second motor, and the fan are all linearly connected to the control box via power lines. The operator can centrally control the start, stop, and speed of each motor, as well as the air volume of the fan, through the control box to realize the automated operation of the equipment, improve production efficiency and ease of operation.
[0009] Preferably, a dryer is fixedly installed inside the connecting pipe, and three adsorption layers are fixedly installed in parallel inside the dryer. The gas in the crystallization vessel is introduced into the air duct through the connecting pipe. The gas passes through the dryer before entering the air duct. The three adsorption layers in the dryer can effectively adsorb the moisture in the gas, keeping the gas entering the air duct dry. The dry gas is blown by the fan into the crystallization chamber, which can improve the dehydration effect of crystallization and prevent the crystals from absorbing water again due to excessive gas humidity.
[0010] Preferably, a sliding rod is fixedly installed at the bottom of the piston. The lower end of the sliding rod is slidably installed inside the collecting pipe and passes through the bottom of the collecting pipe. A spring is provided between the bottom of the piston and the bottom of the collecting pipe and is fitted onto the sliding rod. By providing the spring, when the crystals accumulate to a certain amount in the collecting pipe, the gravity of the crystals overcomes the elastic force of the spring, causing the piston to move downward, opening the lower end of the collecting pipe. The crystals then enter the dehydration tank through the discharge pipe. After the crystals are discharged, the piston moves upward under the action of the spring, closing the lower end of the collecting pipe, thus realizing intermittent discharge of the crystals.
[0011] Preferably, the dehydration tank has sliding grooves on both sides of the tank body, and drawers are provided on both sides of the lower end of the partition, and they are slidably installed in the sliding grooves. The drawers are used to collect crystallized particles.
[0012] The advantages of this utility model are:
[0013] 1. This utility model describes a process for dehydrating lithium hexafluorophosphate crystals. First, raw materials are added to the crystallization vessel through the feed pipe, while reaction gas is introduced through the air inlet pipe. The first motor is then activated, driving the stirring shaft to rotate. The stirring rod on the shaft thoroughly stirs the materials, ensuring uniform mixing and promoting the crystallization reaction of lithium hexafluorophosphate. A rotating spiral gradually transports the crystals to the collection pipe. When a certain amount of crystals accumulates in the collection pipe, the weight of the crystals overcomes the spring force, causing the piston to move downwards, opening the lower end of the collection pipe. The crystals then enter the dehydration tank through the discharge pipe. After entering the dehydration tank, the crystals fall onto the arc... On the sieve plate, the fan starts, blowing the dried gas from the dryer toward the crystallizer to dehydrate it. At the same time, the second motor drives the auger to rotate, and the auger transports the dehydrated crystals from the feed port to the other end of the dehydration tank. The dehydrated gas flows back into the crystallizer through the air vents and return pipe. This structural design realizes the functions of multi-stage dynamic dehydration and efficient utilization of thermal energy. It solves the problem that existing devices may have a single dehydration method, relying only on simple natural drying or simple wind blowing, resulting in slow dehydration speed and excessively long dehydration time for lithium hexafluorophosphate crystallization, which affects the overall production efficiency. This improves dehydration efficiency and energy utilization. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0015] Figure 1 This is a schematic diagram of one side of the crystallization and dehydration device;
[0016] Figure 2 This is a schematic diagram of the other side of the crystallization and dehydration device;
[0017] Figure 3 This is a schematic diagram of the cooling mechanism.
[0018] Figure 4 This is a schematic diagram of the internal structure of the crystallization vessel;
[0019] Figure 5 This is a schematic diagram of the internal structure of the dehydration tank.
[0020] In the diagram: 1. Base; 2. Crystallization vessel; 3. Outer shell; 4. Liquid outlet pipe; 5. Liquid inlet pipe; 6. Feed pipe; 7. Air inlet pipe; 8. First motor; 9. Connecting pipe; 10. Reflux pipe; 11. Dryer; 12. Adsorption layer; 13. Stirring shaft; 14. Stirring rod; 15. Scraper; 16. Collecting pipe; 17. Rotating screw; 18. Discharge pipe; 19. Piston; 20. Slide rod; 21. Spring; 22. Dehydration tank; 23. Air duct; 24. Fan; 25. Baffle plate; 26. Air outlet plate; 27. Arc-shaped sieve plate; 28. Screwdriver; 29. Second motor; 30. Drawer. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0022] Please see Figure 1-5As shown, a lithium hexafluorophosphate preparation crystallization and dehydration device includes a base 1. A crystallization vessel 2 is fixedly installed on the upper part of one end of the base 1. An air inlet pipe 7 and a feed pipe 6 are sequentially fixedly connected to one side of the top center of the crystallization vessel 2, and a reflux pipe 10 and a connecting pipe 9 are sequentially fixedly connected to the other side. A collection pipe 16 is fixedly installed at the bottom of the crystallization vessel 2. A stirring shaft 13 is rotatably installed inside the crystallization vessel 2. The lower end of the stirring shaft 13 extends into the collection pipe 16. Stirring rods 14 are arranged and fixedly installed on both sides of the upper end of the stirring shaft 13. A scraper 15 is fixedly installed at the end of the stirring rod 14. A piston 19 is provided at the lower end of the stirring shaft 13 and is slidably installed in the lower end of the collection pipe 16. A discharge pipe 18 is fixedly connected to one side of the lower end of the collection pipe 16. A dehydration tank 22 is provided on one side of the bottom of the crystallization vessel 2 and is fixedly installed on the base 1. One end of the discharge pipe 18 is fixedly connected to one end of the dehydration tank 22. Extending internally, a duct 23 is fixedly installed on the top of the dehydration tank 22, and a fan 24 is fixedly installed inside the duct 23. A partition 25 is fixedly installed inside the dehydration tank 22 on one side of the duct 23. An air outlet plate 26 is fixedly installed inside the upper part of the partition 25, and multiple air holes are arrayed on the air outlet plate 26. An arc-shaped screen plate 27 is fixedly installed between the partition 25 and the dehydration tank 22 below the air outlet plate 26. A material inlet is opened in the partition 25, and an auger 28 is rotatably installed inside the material inlet. Both ends of the auger 28 are rotatably installed inside the dehydration tank 22 through bearings. A second motor 29 is fixedly installed at one end of the dehydration tank 22. The rotating shaft of the second motor 29 is fixedly connected to one end of the auger 28. The other end of the connecting pipe 9 is fixedly connected to the duct 23, and the other end of the return pipe 10 is fixedly connected to the top of the other end of the dehydration tank 22.During operation, in the lithium hexafluorophosphate crystallization and dehydration process, firstly, raw materials are added to the crystallization vessel 2 through the feed pipe 6, and simultaneously, reaction gas is introduced through the air inlet pipe 7. The first motor 8 is then turned on, driving the stirring shaft 13 to rotate. The stirring rod 14 on the stirring shaft 13 thoroughly stirs the materials, ensuring uniform mixing and promoting the crystallization reaction of lithium hexafluorophosphate. During this process, the scraper 15 continuously scrapes away the crystals on the inner wall of the crystallization vessel 2, and the rotating spiral 17 gradually transports the crystals to the collection pipe 16. When the crystals accumulate to a certain amount in the collection pipe 16, the gravity of the crystals overcomes the elastic force of the spring 21, causing the piston 19 to move downwards, opening the lower end of the collection pipe 16. The crystals enter the dehydration tank 22 through the feed pipe 18. After entering the dehydration tank 22, the crystals fall onto the arc-shaped sieve plate 27. The blower 24 starts, blowing the dried gas from the dryer 11 toward the crystals to dehydrate them. At the same time, the second motor 29 drives the auger 28 to rotate, which transports the dehydrated crystals from the feed port to the other end of the dehydration tank 22. The dehydrated gas flows back into the crystallization vessel 2 through the air vent and return pipe 10, realizing the recycling of gas. During the dehydration process, some crystal particles may fall into the drawer 30 below the partition 25. When a certain amount of crystal particles accumulate in the drawer 30, the operator can pull out the drawer 30 for recycling.
[0023] The crystallization vessel 2 is fixedly installed with an outer shell 3, and a cooling chamber is formed between the outer shell 3 and the outer wall of the crystallization vessel 2. A liquid inlet pipe 5 is fixedly connected to one side of the lower end of the outer shell 3, and a liquid outlet pipe 4 is fixedly connected to the upper end of the other side. During operation, in the process of lithium hexafluorophosphate crystallization and dehydration, a coolant of a suitable temperature is introduced into the cooling chamber through the liquid inlet pipe 5. After the cooling chamber is filled, the coolant flows out through the liquid outlet pipe 4. The coolant flows in the cooling chamber and continuously cools the inside of the crystallization vessel 2, maintaining a stable internal temperature, which helps to form crystals with uniform particle size and high purity.
[0024] A first motor 8 is fixedly installed at the top center of the crystallization vessel 2. The rotating shaft of the first motor 8 is fixedly connected to one end of the stirring shaft 13. A rotating spiral 17 is rotatably installed inside the upper end of the collecting pipe 16 and welded to the lower end of the stirring shaft 13. The first motor 8, the second motor 29, and the blower 24 are all linearly connected to the control box via power lines. During operation, in the process of lithium hexafluorophosphate crystallization and dehydration, the controller controls the first motor 8 to start, which drives the stirring shaft 13 to rotate. The stirring rod 14 on the stirring shaft 13 fully stirs the material in the crystallization vessel 2, making the material evenly mixed, which is beneficial to the crystallization process of lithium hexafluorophosphate. At the same time, the stirring rod 14 drives the scraper 15 and the rotating spiral 17 to rotate. The scraper 15 cleans the crystals on the inner wall of the crystallization vessel 2, and the rotating spiral 17 transports the crystals to the collecting pipe 16 for compression and discharge.
[0025] A dryer 11 is fixedly installed inside the connecting pipe 9. Three adsorption layers 12 are fixedly installed in parallel inside the dryer 11. During operation, in the process of dehydration of lithium hexafluorophosphate crystallization, the connecting pipe 9 introduces the gas in the crystallization vessel 2 into the air duct 23. The gas passes through the dryer 11 before entering the air duct 23. The three adsorption layers 12 in the dryer 11 are molecular sieve adsorption layers 12, which can effectively adsorb the moisture in the gas, keeping the gas entering the air duct 23 dry. The dry gas is blown by the fan 24 to the crystallization in the dehydration tank 22, which can improve the dehydration effect of crystallization and avoid the crystallization from absorbing water again due to excessive gas humidity, thereby ensuring the dryness and purity of lithium hexafluorophosphate crystals.
[0026] A slide rod 20 is fixedly installed at the bottom of the piston 19. The lower end of the slide rod 20 is slidably installed inside the collection pipe 16 and passes through the bottom of the collection pipe 16. A spring 21 is provided between the bottom of the piston 19 and the bottom of the collection pipe 16 and is fitted onto the slide rod 20. During operation, in the process of lithium hexafluorophosphate crystallization and dehydration, when the crystals accumulate to a certain amount in the collection pipe 16, the gravity of the crystals overcomes the elastic force of the spring 21, causing the piston 19 to move downward, opening the lower end of the collection pipe 16. The crystals enter the dehydration tank 22 through the discharge pipe 18. After the crystals are discharged, the piston 19 moves upward under the action of the spring 21, closing the lower end of the collection pipe 16, thus realizing intermittent discharge of the crystals.
[0027] The dehydration tank 22 has sliding grooves on both sides of its body, and drawers 30 are respectively provided on both sides of the lower end of the partition 25, and both are slidably installed in the sliding grooves. During operation, in the process of lithium hexafluorophosphate crystallization and dehydration, as the dehydration operation continues, some crystal particles may fall into the drawers 30 below the partition 25 under the influence of airflow, mechanical vibration and other factors inside the dehydration tank 22. When a certain amount of crystal particles accumulate in the drawers 30, the operator can easily pull the drawers 30 out along the sliding grooves to conveniently and quickly recycle the crystal particles, which not only avoids the waste of crystal particles, but also improves the utilization rate of raw materials.
[0028] Working principle: During the crystallization and dehydration process of lithium hexafluorophosphate, raw materials are first added to the crystallization vessel 2 through the feed pipe 6, while reaction gas is introduced through the air inlet pipe 7. The first motor 8 is turned on, driving the stirring shaft 13 to rotate. The stirring rod 14 on the stirring shaft 13 thoroughly stirs the materials, making them evenly mixed and promoting the crystallization reaction of lithium hexafluorophosphate. During this process, the scraper 15 continuously scrapes off the crystals on the inner wall of the crystallization vessel 2, and the rotating spiral 17 gradually transports the crystals to the collection pipe 16. When the crystals accumulate to a certain amount in the collection pipe 16, the gravity of the crystals overcomes the elastic force of the spring 21, causing the piston 19 to move downwards and opening the lower end of the collection pipe 16. The crystals enter the dehydration tank 22 through the feed pipe 18. After entering the dehydration tank 22, the crystals fall onto the arc-shaped screen plate 27. The blower 24 starts and blows the dried gas from the dryer 11 toward the crystals to dehydrate them. At the same time, the second motor 29 drives the auger 28 to rotate. The auger 28 transports the dehydrated crystals from the feed port to the other end of the dehydration tank 22. The dehydrated gas flows back into the crystallization vessel 2 through the air hole and the return pipe 10 to realize the recycling of gas. During the dehydration process, some crystal particles may fall into the drawer 30 below the partition plate 25. When a certain amount of crystal particles accumulate in the drawer 30, the operator can pull out the drawer 30 for recycling.
[0029] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.
Claims
1. A lithium hexafluorophosphate crystallization dehydrating device, characterized by: The utility model provides a crystallization kettle, including base (1), one end upper portion fixed mounting of base (1) has crystallization kettle (2), the top center one side of crystallization kettle (2) is sequentially fixedly connected with air inlet pipe (7) and feed pipe (6), the other side is sequentially fixedly connected with backflow pipe (10) and connecting pipe (9), the bottom fixed mounting of crystallization kettle (2) has material collecting pipe (16), the rotation of inside crystallization kettle (2) is installed with agitator shaft (13), the lower end of agitator shaft (13) extends to material collecting pipe (16) inside, both sides of the upper end of agitator shaft (13) are arrayed with fixedly installed stirring rod (14), the fixed mounting of scraping blade (15) is arranged at the end of stirring rod (14), the lower end of agitator shaft (13) is provided with piston (19) sliding installation in the lower end of material collecting pipe (16), the lower end one side of material collecting pipe (16) is fixedly connected with the blanking tube (18), the bottom one side of crystallization kettle (2) is provided with dehydration tank (22) fixed installation on base (1), the blanking tube (18) one end is fixedly connected in dehydration tank (22) one end on and extends to inside, the top fixed mounting of dehydration tank (22) has wind cylinder (23), the fixed mounting of fan (24) is arranged in wind cylinder (23), the dehydration tank (22) is fixedly installed in the lower side of the one side of baffle (25) that dehydration tank (22) is provided with in the one side of dehydration tank (22) top, and the fixed mounting of air outlet plate (26) is arranged in the inside of dehydration tank (22) in the one side of baffle (25) upper end, and a plurality of air holes are arrayed in the air outlet plate (26), and the fixed mounting of arc sieve plate (27) is arranged between the inside of dehydration tank (22) and baffle (25) in the lower side of air outlet plate (26), the inside of baffle (25) is provided with a material port, the rotation of material port is provided with auger (28), both ends of auger (28) are rotatably installed in dehydration tank (22) through bearing, the fixed mounting of second motor (29) is arranged in dehydration tank (22), the fixed connection of second motor (29) rotating shaft and auger (28) one end, the fixed connection of connecting pipe (9) other end and wind cylinder (23), the fixed connection of backflow pipe (10) other end in dehydration tank (22) other end top.
2. A lithium hexafluorophosphate crystallization and dehydration device according to claim 1, characterized in that: The utility model provides a crystallization kettle, including base (1), one end upper portion fixed mounting of base (1) has crystallization kettle (2), the top center one side of crystallization kettle (2) is sequentially fixedly connected with air inlet pipe (7) and feed pipe (6), the other side is sequentially fixedly connected with backflow pipe (10) and connecting pipe (9), the bottom fixed mounting of crystallization kettle (2) has material collecting pipe (16), the rotation of inside crystallization kettle (2) is installed with agitator shaft (13), the lower end of agitator shaft (13) extends to material collecting pipe (16) inside, both sides of the upper end of agitator shaft (13) are arrayed with fixedly installed stirring rod (14), the fixed mounting of scraping blade (15) is arranged at the end of stirring rod (14), the lower end of agitator shaft (13) is provided with piston (19) sliding installation in the lower end of material collecting pipe (16), the lower end one side of material collecting pipe (16) is fixedly connected with the blanking tube (18), the bottom one side of crystallization kettle (2) is provided with dehydration tank (22) fixed installation on base (1), the blanking tube (18) one end is fixedly connected in dehydration tank (22) one end on and extends to inside, the top fixed mounting of dehydration tank (22) has wind cylinder (23), the fixed mounting of fan (24) is arranged in wind cylinder (23), the dehydration tank (22) is fixedly installed in the lower side of the one side of baffle (25) that dehydration tank (22) is provided with in the one side of dehydration tank (22) top, and the fixed mounting of air outlet plate (26) is arranged in the inside of dehydration tank (22) in the one side of baffle (25) upper end, and a plurality of air holes are arrayed in the air outlet plate (26), and the fixed mounting of arc sieve plate (27) is arranged between the inside of dehydration tank (22) and baffle (25) in the lower side of air outlet plate (26), the inside of baffle (25) is provided with a material port, the rotation of material port is provided with auger (28), both ends of auger (28) are rotatably installed in dehydration tank (22) through bearing, the fixed mounting of second motor (29) is arranged in dehydration tank (22), the fixed connection of second motor (29) rotating shaft and auger (28) one end, the fixed connection of connecting pipe (9) other end and wind cylinder (23), the fixed connection of backflow pipe (10) other end in dehydration tank (22) other end top.
3. The lithium hexafluorophosphate crystallization and dehydration device according to claim 1, characterized in that: The utility model provides a crystallization kettle, including base (1), one end upper portion fixed mounting of base (1) has crystallization kettle (2), the top center one side of crystallization kettle (2) is sequentially fixedly connected with air inlet pipe (7) and feed pipe (6), the other side is sequentially fixedly connected with backflow pipe (10) and connecting pipe (9), the bottom fixed mounting of crystallization kettle (2) has material collecting pipe (16), the rotation of inside crystallization kettle (2) is installed with agitator shaft (13), the lower end of agitator shaft (13) extends to material collecting pipe (16) inside, both sides of the upper end of agitator shaft (13) are arrayed with fixedly installed stirring rod (14), the fixed mounting of scraping blade (15) is arranged at the end of stirring rod (14), the lower end of agitator shaft (13) is provided with piston (19) sliding installation in the lower end of material collecting pipe (16), the lower end one side of material collecting pipe (16) is fixedly connected with the blanking tube (18), the bottom one side of crystallization kettle (2) is provided with dehydration tank (22) fixed installation on base (1), the blanking tube (18) one end is fixedly connected in dehydration tank (22) one end on and extends to inside, the top fixed mounting of dehydration tank (22) has wind cylinder (23), the fixed mounting of fan (24) is arranged in wind cylinder (23), the dehydration tank (22) is fixedly installed in the lower side of the one side of baffle (25) that dehydration tank (22) is provided with in the one side of dehydration tank (22) top, and the fixed mounting of air outlet plate (26) is arranged in the inside of dehydration tank (22) in the one side of baffle (25) upper end, and a plurality of air holes are arrayed in the air outlet plate (26), and the fixed mounting of arc sieve plate (27) is arranged between the inside of dehydration tank (22) and baffle (25) in the lower side of air outlet plate (26), the inside of baffle (25) is provided with a material port, the rotation of material port is provided with auger (28), both ends of auger (28) are rotatably installed in dehydration tank (22) through bearing, the fixed mounting of second motor (29) is arranged in dehydration tank (22), the fixed connection of second motor (29) rotating shaft and auger (28) one end, the fixed connection of connecting pipe (9) other end and wind cylinder (23), the fixed connection of backflow pipe (10) other end in dehydration tank (22) other end top.
4. The lithium hexafluorophosphate crystallization and dehydration device according to claim 1, characterized in that: 5. The lithium hexafluorophosphate crystallization and dehydration apparatus according to claim 1, wherein: The bottom of the piston (19) is fixedly provided with a sliding rod (20), the lower end of the sliding rod (20) is slidingly installed in the collecting pipe (16) and penetrates through the bottom of the collecting pipe (16), and a spring (21) is arranged between the bottom of the piston (19) and the inner bottom of the collecting pipe (16) and sleeved on the sliding rod (20).
6. A lithium hexafluorophosphate crystallization and dehydration apparatus according to claim 1, wherein: Sliding grooves are formed in the two side box bodies of the dehydration tank (22), drawers (30) are arranged at the lower ends of the two sides of the partition plate (25), and the drawers (30) are slidingly installed in the sliding grooves.