Efficient crystallization kettle for producing lithium hexafluorophosphate

Abstract

The utility model relates to a high-efficiency crystallization kettle for producing lithium hexafluorophosphate, which comprises a crystallization kettle body, a heat exchange jacket, a high-efficiency crystallization kettle body and a high-efficiency crystallization kettle body, the stirring mechanism comprises a driving shaft; the connecting piece is in a hollow circular truncated cone shape and movably arranged on the outer side of the driving shaft in a sleeving mode, the connecting piece and the outer side wall of the driving shaft are arranged in a spaced mode, the bottom of the connecting piece can be movably supported up and down through a plurality of telescopic pipe fittings fixedly connected to the bottom of the crystallization kettle body, and a liquid inlet and a liquid outlet which communicate with a hollow cavity of the connecting piece are formed in the bottom of the connecting piece; the liquid inlet and the liquid outlet are respectively connected to the corresponding telescopic pipe fittings; and the ultrasonic transducer is fixedly mounted on the outer side wall of the connecting piece. According to the utility model, the circular-truncated-cone-shaped connecting pieces which are arranged at intervals are used for installing the ultrasonic transducers so as to assist crystallization, and the battery-grade lithium hexafluorophosphate crystal product with high quality and a crystal structure can be obtained by utilizing internal and external synchronous heat exchange through the matching of the connecting pieces and the interlayer.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of crystallization kettle, concretely relates to a high -efficient crystallization kettle for lithium hexafluorophosphate production. BACKGROUND

[0002] As the core component of lithium ion battery, lithium hexafluorophosphate is widely used in power, energy storage and various batteries for daily use. Its electrical performance is excellent, and it is the most outstanding and widely used one in the current lithium ion battery electrolyte. Industrial preparation generally obtains lithium hexafluorophosphate solution by the reaction of phosphorus pentafluoride and lithium fluoride dissolved in anhydrous hydrofluoric acid solution, and then crystallizes lithium hexafluorophosphate from the lithium hexafluorophosphate solution.

[0003] Lithium hexafluorophosphate crystallization is mainly through static crystallization and dynamic crystallization. Although static crystallization is easy to realize, the crystallization period is long, and the repeated growth of crystal nucleus makes it difficult to handle the hydrogen fluoride in the crystal through purification process. In addition to static crystallization, dynamic crystallization equipment using traditional blade stirring and water cooling to precipitate crystals is gradually replacing static crystallization and is widely used. However, the mixing effect of the mechanical stirring method on the raw materials is poor, which is not conducive to the growth of lithium hexafluorophosphate crystals and reduces the lithium hexafluorophosphate crystallization efficiency. Moreover, lithium hexafluorophosphate crystals are easy to grow on the tank wall, which is not conducive to the discharge of lithium hexafluorophosphate crystals. Therefore, an ultrasonic transducer connected to an ultrasonic generator is arranged to help improve the crystallization efficiency and rate of lithium hexafluorophosphate. However, the ultrasonic transducer is generally installed on the side wall of the crystallization kettle. High-frequency vibration can easily affect the sealing performance of the crystallization kettle and the performance of the stirring equipment installed on the crystallization kettle, and the vibration energy is also wasted, causing energy waste.

[0004] Therefore, the design of a connecting piece arranged at intervals and in the shape of a circular truncated cone for installing an ultrasonic transducer to assist crystallization ensures that the crystallization efficiency and rate of lithium hexafluorophosphate are improved, the sealing performance of the kettle body and the performance of the stirring equipment are not adversely affected, and the high-efficiency crystallization kettle for lithium hexafluorophosphate production, which can obtain high-quality, crystal-structured battery-grade lithium hexafluorophosphate crystal product through the cooperation of the connecting piece and the double-layer sleeve to promote the production of lithium hexafluorophosphate, is the research purpose of the utility model. UTILITY MODEL CONTENTS

[0005] In view of the technical problems existing in the prior art, the utility model provides a high-efficiency crystallization kettle for lithium hexafluorophosphate production, which can effectively solve the technical problems existing in the prior art.

[0006] The technical scheme of the utility model is:

[0007] A high-efficiency crystallization kettle for lithium hexafluorophosphate production, comprising:

[0008] The crystallization kettle body is provided with a corresponding heat exchange jacket on the outer side thereof in a spaced state, and the heat exchange jacket is filled with cooling liquid flowing therethrough;

[0009] The stirring mechanism comprises a driving shaft rotatably arranged in the crystallization kettle body and driven by a corresponding motor, and a plurality of stirring rods are arranged on the driving shaft and provided with corresponding stirring blades.

[0010] The lower end of the driving shaft extends downward to the bottom of the crystallization kettle body, and the adapter is in the form of a hollow truncated cone and movably arranged on the outer side of the driving shaft and spaced from the outer wall of the driving shaft. The bottom of the adapter is movably supported by a plurality of telescopic tubes fixed to the bottom of the crystallization kettle body. The hollow cavity of the adapter is provided with a partition, and the hollow cavity is divided into a liquid inlet channel and a liquid outlet channel in communication through the partition. The bottom of the adapter is provided with a liquid inlet connected to the liquid inlet channel and a liquid outlet connected to the liquid outlet channel, and the liquid inlet and the liquid outlet are respectively connected to the corresponding telescopic tubes.

[0011] The ultrasonic transducer is fixedly arranged on the outer wall of the adapter.

[0012] A plurality of elastic members are radially fixed to the outer wall of the driving shaft opposite to the adapter, and the elastic members are circumferentially distributed and arranged upward and downward. One end of the elastic member not connected to the driving shaft is spaced from the inner wall of the adapter.

[0013] The ultrasonic transducer is electrically connected to an ultrasonic generator outside through a power supply line penetrating through the corresponding telescopic tube.

[0014] A flow guide pipe connected to the top liquid outlet of the adapter is integrally formed on the inner side of the outer wall of the adapter, and the flow guide pipe extends downward along the inner side of the outer wall of the adapter to the outlet arranged at the bottom of the adapter.

[0015] The telescopic tube is an elastic bellows.

[0016] Three stirring rods in the form of inverted L are fixed to the upper side of the driving shaft at equal angles, and the distal end of the stirring rod extends downward to the bottom of the crystallization kettle body.

[0017] The heat exchange jacket is respectively provided with a corresponding liquid inlet pipe and a liquid outlet pipe on the upper and lower sides thereof, and the liquid inlet pipe and the telescopic tube connected to the liquid inlet of the adapter are both connected to the cooling liquid source outside through a corresponding liquid pumping pump. The liquid outlet pipe and the telescopic tube connected to the liquid outlet of the adapter are both connected to the cooling liquid source through a corresponding refrigerator.

[0018] The upper part of the crystallization kettle body is fixedly provided with a corresponding cover, the cover is provided with a corresponding feeding port through a corresponding feeding cover, and the bottom of the crystallization kettle body is provided with a liquid discharge port and a crystallization product discharge port through a corresponding material valve.

[0019] The crystallization kettle body is supported and installed by corresponding supporting legs.

[0020] The utility model discloses the advantages are:

[0021] 1) the utility model discloses the connecting piece of movable installation is used for installing ultrasonic transducer, the driving shaft of stirring mechanism is extended downward for interval sleeve setting connecting piece, and then the telescopic pipe of being fixed in the bottom of crystallization kettle body is used for movable support installation connecting piece, on the basis of avoiding the direct rigid contact of crystallization kettle body and stirring mechanism, the limiting installation of connecting piece is realized, so that the ultrasonic transducer is installed in the middle part of crystallization kettle body, the efficiency and rate of lithium hexafluorophosphate crystallization are improved, and the adverse effect of the sealing property of crystallization kettle body and the performance of stirring equipment caused by installing ultrasonic transducer is effectively solved.

[0022] 2) the utility model further sets up connecting piece as circular table hollow structure, and the setting of circular table can ensure that the gravity center of connecting piece is inclined to be upright, and then when the ultrasonic transducer is in action, the excessive inclination of connecting piece is avoided to ensure the practical effect, and the telescopic pipe is further used for movable support installation, the vibration effect of ultrasonic transducer on liquid is further enlarged, the crystallization of lithium hexafluorophosphate is promoted, and the connection of crystallization kettle body is flexible, the high-frequency vibration of ultrasonic transducer is weakened or reduced and directly acts on crystallization kettle body, and the hollow setting and the conduction of telescopic pipe are combined to flow through cooling liquid, and the heat exchange jacket is used for heat exchange in the middle and periphery in multiple directions, the cooling and uniform temperature effect are accelerated, and the battery-grade lithium hexafluorophosphate crystal product of high quality and crystal structure is obtained.

[0023] 3) the utility model further fixes the corresponding elastic element on the outside of the driving shaft to prevent the deviation of connecting piece from affecting the driving shaft during use, and ensure the practical effect of the utility model. ACCURACY

[0024] Figure 1 It is the structure schematic drawing of the utility model.

[0025] Figure 2 It is Figure 1 the sectional view schematic drawing.

[0026] Figure 3 It is the sectional view schematic drawing of the other side of connecting piece (cooling liquid flow schematic drawing).

[0027] Figure 4 It is the structure schematic drawing of embodiment two.

[0028] In the drawing: crystallization kettle body 1, heat exchange jacket 2, motor 3, drive shaft 4, stirring rod 5, stirring blade 6, adapter 7, liquid inlet 701, liquid outlet 702, telescopic pipe 8, ultrasonic transducer 9, elastic member 10, flow guide pipe 11, liquid outlet 12, crystalline material discharge port 13, foot 14, cover 15, feed inlet 1501. DETAILED DESCRIPTION

[0029] In order to facilitate those skilled in the art to understand, the structure of the utility model will be further described in detail in combination with the drawings:

[0030] Example one

[0031] Reference Figures 1-3 A kind of lithium hexafluorophosphate production with efficient crystallization kettle, comprising:

[0032] Crystallization kettle body 1, the outer side of the crystallization kettle body 1 is installed with a corresponding heat exchange jacket 2 in the interval state, and the heat exchange jacket 2 is filled with circulating cooling liquid;

[0033] Stirring mechanism, containing drive shaft 4 installed in the crystallization kettle body 1 by corresponding motor 3 drive rotation, the drive shaft 4 is provided with a plurality of stirring rods 5, and the stirring rod 5 is provided with corresponding stirring blade 6;

[0034] Adapter 7, the lower end of the drive shaft 4 extends to the bottom of the crystallization kettle body 1, the adapter 7 is hollow circular truncated cone and movably sleeved on the outside of the drive shaft 4, and is spaced apart from the outer wall of the drive shaft 4, the bottom of the adapter 7 is movably supported by a plurality of telescopic pipe 8 fixed on the bottom of the crystallization kettle body 1, the hollow cavity of the adapter 7 is provided with a partition, and the hollow cavity forms a liquid inlet channel and a liquid outlet channel in communication through the partition, the bottom of the adapter 7 is provided with a liquid inlet 701 connected to the liquid inlet channel and a liquid outlet 702 connected to the liquid outlet channel, and the liquid inlet 701 and the liquid outlet 702 are connected to the corresponding telescopic pipe 8 respectively;

[0035] Ultrasonic transducer 9, fixedly installed on the outer wall of the adapter 7.

[0036] This invention utilizes a movable connector 7 for mounting an ultrasonic transducer 9. By extending the drive shaft 4 of the stirring mechanism downwards to space the connector 7, and using multiple telescopic tubes 8 fixed to the bottom of the crystallization vessel 1 for movable support of the connector 7, the connection 7 is positioned and installed in a limited manner while avoiding direct rigid contact between the crystallization vessel 1 and the stirring mechanism. This allows the ultrasonic transducer 9 to be installed in the middle of the crystallization vessel 1, thereby improving the efficiency and rate of lithium hexafluorophosphate crystallization and effectively solving the adverse effects of installing the ultrasonic transducer 9 on the sealing of the crystallization vessel 1 and the performance of the stirring equipment.

[0037] This invention further designs the connector 7 as a frustum-shaped hollow structure. The frustum shape ensures that the center of gravity of the connector 7 is lower and tends to be upright, thus preventing excessive tilting of the connector 7 when the ultrasonic transducer 9 is in operation, ensuring practical effectiveness. The movable support installation is achieved through the telescopic tube 8, further amplifying the vibration effect of the ultrasonic transducer 9 on the liquid, promoting the crystallization of lithium hexafluorophosphate, and making the connection with the crystallization vessel 1 a flexible connection, weakening or reducing the direct impact of the high-frequency vibration of the ultrasonic transducer on the crystallization vessel 1. The hollow design and the conductive function of the telescopic tube 8 are combined to allow the flow of coolant, and with the heat exchange jacket 2, heat exchange is carried out from the center and the periphery in multiple directions, accelerating the cooling and temperature uniformity effect, and promoting the production of high-quality, crystalline battery-grade lithium hexafluorophosphate crystal products.

[0038] The ultrasonic transducer 9 is electrically connected to an external ultrasonic generator via a power line passing through the corresponding retractable tube 8.

[0039] The inner side of the outer wall of the connector 7 is integrally formed with a guide pipe 11 that connects to its top liquid outlet 702, and the guide pipe 11 extends downward along the inner side of the outer wall of the connector 7 to its outlet located at the bottom of the connector 7.

[0040] The expandable tube 8 is an elastic corrugated tube.

[0041] Three inverted L-shaped stirring rods 5 are fixed at equal angles to the upper side of the drive shaft 4, and the ends of the stirring rods 5 extend downward to the bottom of the crystallization vessel 1.

[0042] The heat exchange jacket 2 has corresponding inlet pipes 201 and outlet pipes 202 respectively arranged on its upper and lower sides. The inlet pipe 201 and the retractable pipe 8 connecting the inlet port 701 of the connector 7 are both connected to the external coolant source through corresponding liquid pumps. The outlet pipe 202 and the retractable pipe 8 connecting the outlet port 702 of the connector 7 are both connected to the coolant source through corresponding coolers.

[0043] The upper part of the crystallization kettle body 1 is fixedly installed with a corresponding cover, a corresponding feeding port 1501 is arranged on the cover through a corresponding feeding cover, the bottom of the crystallization kettle body 1 is provided with a liquid discharge port 12 and a crystallization product discharge port 13 through a corresponding material valve.

[0044] The crystallization kettle body 1 is supported and installed by corresponding supporting legs 14.

[0045] Embodiment two

[0046] Reference Figure 4 The difference between the embodiment and embodiment one is that a plurality of elastic members 10 are fixedly connected to the outer side wall of the driving shaft 4 at positions opposite to the adapter 7, the elastic members 10 are distributed along the circumference and arranged up and down, and one end of the elastic member 10 not connected to the driving shaft 4 is arranged in a spaced manner with the inner side wall of the adapter 7.

[0047] The utility model further fixes and installs corresponding elastic members 10 on the outer side of the driving shaft 4 to prevent the adapter 7 from deviating and affecting the driving shaft 4 during use, and ensure the practical effect of the utility model.

[0048] It should be pointed out that the implementation principle and technical effect of the embodiment and embodiment one are the same, for the sake of brief description, the places not mentioned in the embodiment can refer to the corresponding contents in embodiment one.

[0049] The above is only the preferred embodiment of the utility model, it should be pointed out that for ordinary skilled person in the art, on the premise of not departing from the principle of the utility model, a number of improvements and refinements can be made, these improvements and refinements should also be regarded as the protection scope of the utility model.

Claims

1. A high-efficiency crystallization reactor for the production of lithium hexafluorophosphate, characterized in that, It includes: Crystallization kettle body (1), the outer side of the crystallization kettle body (1) is spaced outwardly sandwiched with a corresponding heat exchange jacket (2), the heat exchange jacket (2) is filled with circulating cooling liquid; Stirring mechanism, containing the drive shaft (4) that is rotatably installed in the crystallization kettle body (1) by corresponding motor (3), a plurality of stirring rods (5) are provided on the drive shaft (4), and corresponding stirring blades (6) are provided on the stirring rod (5); Adapter (7), the lower end of the drive shaft (4) extends to the bottom of the crystallization kettle body (1), the adapter (7) is hollow and is movably sleeved on the outside of the drive shaft (4), and is spaced apart from the outer wall of the drive shaft (4), the bottom of the adapter (7) is movably supported by a plurality of telescopic pipe fittings (8) fixed on the bottom of the crystallization kettle body (1), the hollow cavity of the adapter (7) is provided with a partition, the hollow cavity is formed into a liquid inlet channel and a liquid outlet channel by the partition, the bottom of the adapter (7) is provided with a liquid inlet (701) connected to the liquid inlet channel and a liquid outlet (702) connected to the liquid outlet channel, and the liquid inlet (701) and the liquid outlet (702) are respectively connected to the corresponding telescopic pipe fittings (8); Ultrasonic transducer (9), fixedly installed on the outer wall of the adapter (7).

2. The efficient crystallization kettle for producing lithium hexafluorophosphate according to claim 1, characterized in that, The outer wall of the drive shaft (4) is radially fixed with a plurality of elastic members (10) at a position opposite to the adapter (7), the elastic members (10) are circumferentially distributed and arranged up and down, and one end of the elastic members (10) not connected to the drive shaft (4) is spaced apart from the inner wall of the adapter (7).

3. The efficient crystallization kettle for producing lithium hexafluorophosphate according to claim 1, characterized in that, The ultrasonic transducer (9) is electrically connected to the ultrasonic generator outside through the power supply line penetrating through the corresponding telescopic pipe fitting (8).

4. The efficient crystallization kettle for producing lithium hexafluorophosphate according to claim 1, characterized in that, The outer wall of the adapter (7) is integrally formed with a flow guide pipe (11) connected to the top liquid outlet (702), and the flow guide pipe (11) extends downward along the inner side of the outer wall of the adapter (7) to the bottom of the adapter (7).

5. The efficient crystallization kettle for producing lithium hexafluorophosphate according to claim 1, characterized in that, The telescopic pipe fitting (8) is an elastic bellows.

6. The efficient crystallization kettle for producing lithium hexafluorophosphate according to claim 1, characterized in that, The upper side of the drive shaft (4) is fixed with three stirring rods (5) in the shape of inverted L, and the distal end of the stirring rod (5) extends downward to the bottom of the crystallization kettle body (1).

7. The efficient crystallization kettle for producing lithium hexafluorophosphate according to claim 1, characterized in that, The upper and lower sides of the heat exchange jacket (2) are respectively provided with corresponding liquid inlet pipe (201) and liquid outlet pipe (202), and the liquid inlet pipe (201) and the telescopic pipe fitting (8) connected to the liquid inlet (701) of the adapter (7) are both connected to the cooling liquid source outside through the corresponding liquid pump, and the liquid outlet pipe (202) and the telescopic pipe fitting (8) connected to the liquid outlet (702) of the adapter (7) are both connected to the cooling liquid source through the corresponding refrigerator.

8. The efficient crystallization kettle for producing lithium hexafluorophosphate according to claim 1, characterized in that, The upper part of the crystallization kettle body (1) is fixedly installed with a corresponding cover (15), and the cover (15) is provided with a corresponding feeding port (1501) through a corresponding feeding cover.

9. The efficient crystallization kettle for producing lithium hexafluorophosphate according to claim 1, characterized in that, The crystallization kettle body (1) is supported and installed by corresponding supporting legs (14).

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