Continuous production system for lithium hexafluorophosphate

Abstract

The invention relates to a lithium hexafluorophosphate continuous production system. The lithium hexafluorophosphate continuous production system comprises a dissolver, a condenser and a reactor, the reactor is divided into a reaction zone, a buffer zone and a drying zone from bottom to top, the bottom of the reactor is provided with a lower phosphorus pentafluoride gas inlet pipe, the top of the reactor is provided with an upper phosphorus pentafluoride gas inlet pipe, the reactor is provided with a feeding pipe, the feeding pipe is connected with a discharging port of the dissolver, and the discharging port of the dissolver is connected with the condenser. The reactor is provided with an air outlet pipe communicated with the buffer area, the air outlet pipe is connected with an air inlet of the condenser, and the reactor is provided with a cooling sleeve located on the outer side of the reaction area and a heating sleeve located on the outer side of the drying area. The lithium hexafluorophosphate continuous production system provided by the invention realizes continuous operation of reaction, cooling crystallization, filtration and drying, and improves the production efficiency. In the drying process, phosphorus pentafluoride airflow is used for blowing lithium hexafluorophosphate, on one hand, the content of hydrogen fluoride in lithium hexafluorophosphate is reduced, and on the other hand, cyclic utilization of hydrogen fluoride attached to lithium hexafluorophosphate is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of lithium hexafluorophosphate production, and in particular relates to a lithium hexafluorophosphate continuous production system. Background Art

[0002] Lithium hexafluorophosphate is the most widely used electrolyte salt in commercial lithium-ion batteries. With the rapid development of the electronics industry and the continued expansion of new energy fields in the future, the demand for high-performance batteries is increasing, and the market demand for lithium hexafluorophosphate will show a rapid growth trend.

[0003] At present, the preparation routes of lithium hexafluorophosphate mainly include the following: gas-solid direct reaction method, solvent method and ion exchange method. Among them, the most studied, most mature technology and most widely used process in industry is the HF solvent method. The HF solvent method is to first dissolve LiF in a hydrofluoric acid solvent, and then react with phosphorus pentafluoride to prepare a lithium hexafluorophosphate product. The specific process route is as follows: first dissolve lithium fluoride in a hydrofluoric acid solvent to obtain a lithium hydrogen fluoride solution, then pass phosphorus pentafluoride gas into the lithium hydrogen fluoride solution, react, cool and crystallize, filter, and dry to obtain high-purity LiPF 6 Product. It can be seen that the traditional hydrofluoric acid solvent method for preparing lithium hexafluorophosphate is an intermittent process with low production efficiency. In addition, since the traditional hydrofluoric acid solvent method for preparing lithium hexafluorophosphate uses hydrogen fluoride as a solvent, the hydrogen fluoride content in the crystallized lithium hexafluorophosphate is often high. A high hydrogen fluoride content will directly reduce the safety performance of the battery. After the lithium hexafluorophosphate crystals are filtered, a large amount of nitrogen needs to be used for purging and drying, which not only increases the process steps, but also consumes a large amount of nitrogen, increasing the production cost. In view of the shortcomings of the prior art, it is necessary to further improve. Summary of the invention

[0004] In order to achieve the above object, the present invention provides a continuous production system of lithium hexafluorophosphate.

[0005] The technical solution of a lithium hexafluorophosphate continuous production system of the present invention is:

[0006] A lithium hexafluorophosphate continuous production system comprises a dissolver, a condenser and a reactor. The interior of the reactor is divided into a reaction zone, a buffer zone and a drying zone from bottom to top. A lower phosphorus pentafluoride air inlet pipe is provided at the bottom of the reactor, an upper phosphorus pentafluoride air inlet pipe is provided at the top of the reactor, a feed pipe for feeding into the reaction zone is provided on the reactor, a discharge pipe is provided at the upper end of the outer wall of the reactor, the feed pipe is connected to the discharge port of the dissolver, an outlet pipe connected to the buffer zone is provided on the reactor, the outlet pipe is connected to the air inlet of the condenser, the outlet of the condenser is respectively connected to the upper phosphorus pentafluoride air inlet pipe and the lower phosphorus pentafluoride air inlet pipe, a cooling jacket located outside the reaction zone and a heating jacket located outside the drying zone are provided on the reactor, and a filtering, lifting and discharging mechanism for filtering lithium hexafluorophosphate in the solution in the reaction zone, lifting it to the drying zone and discharging it from the discharge pipe is provided in the reactor.

[0007] Furthermore, the filtering, lifting and discharging mechanism includes a screw rod rotatably installed in the reactor and a filter plate assembly guided and assembled in the reactor, the filter plate assembly cooperates with the screw rod, the filter plate assembly includes a fixed plate, a plurality of filter plates are hinged on the fixed plate, a torsion spring is provided on the hinge shaft of the filter plate to press the filter plate against the fixed plate, a magnet is provided at one end of the upper side of the filter plate, a first electromagnet located outside the reaction zone is provided on the reactor, the first electromagnet is energized and attracted to the magnet, a discharge pipe connected to the drying zone is provided on the reactor, a second electromagnet located outside the drying zone and on the upper side of the discharge pipe is provided on the reactor, the second electromagnet is attracted to the magnet after energization.

[0008] Furthermore, the fixing plate is a concave plate with high edges and a low middle, a screw hole matching the screw rod is provided at the center of the fixing plate, a plurality of mounting holes evenly arranged along the circumference of the screw hole are provided on the fixing plate, the filter plate is hinged on the outer hole wall of the mounting hole, and a supporting edge for supporting the filter plate is provided on the inner hole wall of the mounting hole.

[0009] Furthermore, the filter plate assembly includes a rotating shaft rotatably mounted on the lower side of the fixed plate and parallel to the filter plate, the rotating shaft is provided with a cam for driving the filter plate to rotate, a gear is rotatably mounted on the lower side of the fixed plate, a worm wheel is provided on the rotating shaft of the gear, a worm is provided on the rotating shaft, and a rack meshing with the gear is provided on the inner wall of the reactor.

[0010] Furthermore, the cross section of the reactor is rectangular, the cross section of the fixing plate is rectangular, there are four mounting holes, and the mounting holes are isosceles trapezoidal.

[0011] Furthermore, the filtering, lifting and discharging mechanism comprises an auger rotatably installed in the reactor, the reactor is provided with a reduction motor for driving the auger to rotate, and the spiral blades of the auger are provided with filter holes.

[0012] Furthermore, the reactor is arranged obliquely, and the auger is arranged coaxially with the reactor.

[0013] The present invention provides a lithium hexafluorophosphate continuous production system, which has the following beneficial effects:

[0014] Lithium fluoride is dissolved in a hydrogen fluoride solvent in a dissolver to obtain a lithium hydrogen fluoride solution, which is then introduced into a reactor, and phosphorus pentafluoride is introduced into the lithium hydrogen fluoride solution for reaction to generate lithium hexafluorophosphate. After the lithium hexafluorophosphate in the hydrogen fluoride solution reaches saturation, the newly generated lithium hexafluorophosphate crystallizes in the form of a solid and is suspended in an anhydrous hydrogen fluoride solution under the action of stirring. The filtering, lifting and discharging mechanism filters the lithium hexafluorophosphate and lifts the lithium hexafluorophosphate to a drying zone, during which the heating sleeve and the phosphorus pentafluoride gas flow dry the lithium hexafluorophosphate. The dried lithium hexafluorophosphate is discharged from the reactor. The lithium hexafluorophosphate continuous production system of the present invention realizes continuous operation of reaction, cooling crystallization, filtration and drying, and improves production efficiency. During the drying process, the phosphorus pentafluoride gas flow is used to blow the lithium hexafluorophosphate, which reduces the hydrogen fluoride content in the lithium hexafluorophosphate on the one hand, and realizes the recycling of hydrogen fluoride attached to the lithium hexafluorophosphate on the other hand. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of a lithium hexafluorophosphate continuous production system according to an embodiment of the present invention;

[0016] Figure 2 Schematic diagram of the internal structure of a reactor in a lithium hexafluorophosphate continuous production system according to an embodiment of the present invention;

[0017] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0018] Figure 4 is the state of the filter plate assembly when the reactor is unloading in the lithium hexafluorophosphate continuous production system of the embodiment of the present invention;

[0019] Figure 5 is a top view of a filter plate assembly in a reactor in a lithium hexafluorophosphate continuous production system according to an embodiment of the present invention;

[0020] Figure 6 Schematic diagram of the internal structure of a reactor in a lithium hexafluorophosphate continuous production system according to an embodiment of the present invention;

[0021] In the figure: 1, dissolver; 2, stirring device; 3, condenser; 4, reactor; 41, reaction zone; 42, buffer zone; 43, drying zone; 5, first connecting pipe; 6, second connecting pipe; 7, lower phosphorus pentafluoride air inlet pipe; 8, upper phosphorus pentafluoride air inlet pipe; 9, feed pipe; 10, air outlet pipe; 11, discharge pipe; 12, cooling sleeve; 13, heating sleeve; 14, first electromagnet; 15, second electromagnet; 16, lead screw; 17, motor fixing seat; 18, reduction motor; 19, fixing frame; 20, stirrer; 21, drive motor; 22, fixing plate; 23, screw hole; 24, filter plate; 25, magnet; 26, gear; 27, rack; 28, rotating shaft; 29, cam; 30, auger. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0023] The specific embodiment of the lithium hexafluorophosphate continuous production system of the present invention is as follows Figures 1 to 5 As shown, it includes a dissolver 1, a condenser 3 and a reactor 4.

[0024] The reactor 4 is a cylindrical structure with a rectangular cross section, and the interior of the reactor 4 is divided into a drying area 43, a buffer area 42 and a reaction area 41 from top to bottom. A filtering lifting and discharging mechanism is installed inside the reactor 4, and the filtering lifting and discharging mechanism includes a screw 16 rotatably installed in the reactor and a filter plate assembly installed in the reactor. Among them, the screw 16 is located at the center of the reactor 4, and the upper end of the screw 16 is rotatably installed on the top of the reactor 4 through a bearing. The interior of the reactor 4 is fixedly connected with a fixed frame 19, and the fixed frame 19 includes a fixed ring and a plurality of fixed rods fixedly connected to the outer wall of the fixed ring. The lower end of the screw 16 is rotatably installed on the fixed ring through a bearing, and the outer end of the fixed rod is fixedly connected to the inner wall of the reactor 4. The top of the reactor 4 is fixedly connected with a motor fixing seat 17, and the upper side of the motor fixing seat 17 is fixedly connected with a reduction motor 18, and the output shaft of the reduction motor 18 extends into the interior of the motor fixing seat 17, and the upper end of the screw 16 also extends into the interior of the motor fixing seat 17, and the output shaft of the reduction motor 18 is fixedly connected to the upper end of the screw 16 through a coupling.

[0025] The cross section of the filter plate assembly is rectangular, and the outer side of the filter plate 24 is in close contact with the inner wall of the reactor 4. The center of the filter plate 24 has a rectangular plane, and a screw hole 23 matching the screw rod 16 is provided at the center of the plane. The outer edge of the filter plate 24 has a plane of a rectangular ring, and also has an inclined surface located between the two planes, and the inclined surface is inclined downward. Four mounting holes are provided on the inclined surface, and the cross sections of the four mounting holes are all isosceles trapezoidal, and the four mounting holes are evenly spaced along the circumference of the screw hole 23. There are four filter plates 24, and the four filter plates 24 are respectively installed in the four mounting holes, and the cross section of the filter plate 24 is an isosceles trapezoid. The outer end of the filter plate 24 is hinged on the outer end hole wall of the mounting hole, and the inner end hole wall of the mounting hole has a supporting edge for supporting the filter plate 24. A torsion spring is installed on the hinge shaft of the filter plate 24, and the torsion spring presses the filter plate 24 against the supporting edge. A magnet 25 is fixedly connected to the side surface of the inner end of the filter plate 24.

[0026] The filter plate assembly also includes a rotating shaft 28 rotatably mounted on the lower side of the fixed plate 22 and parallel to the filter plate 24, and a cam 29 is fixedly connected to the rotating shaft 28. A gear 26 is rotatably mounted on the lower side of the fixed plate 22, a worm wheel is mounted on the rotating shaft 28 of the gear 26, and a worm is fixedly connected to the end of the rotating shaft 28 close to the worm wheel, and a rack 27 meshing with the gear 26 is provided on the inner wall of the reactor 4. The meshing of the gear 26 and the rack 27 also plays a guiding role for the filter plate assembly moving up and down. During the rotation of the cam 29 with the rotating shaft 28, the cam 29 can push the filter plate 24 to rotate around the hinge axis. When the point at which the cam 29 is farthest from the rotating shaft 28 contacts the filter plate 24, the filter plate 24 is on the upper side in the horizontal direction. When the point at which the cam 29 is closest to the rotating shaft 28 is close to the filter plate 24, the filter plate 24 is pressed against the support edge under the action of the torsion spring.

[0027] The bottom of the outer wall of the reactor 4 is welded with a lower phosphorus pentafluoride air inlet pipe 7 connected to the reaction zone 41, and the top is welded with an upper phosphorus pentafluoride air inlet pipe 8 connected to the drying zone 43. A feed pipe 9 for feeding into the reaction zone 41 and an air outlet pipe 10 connected to the buffer zone 42 are welded on one side of the outer wall of the reactor 4. A discharge pipe 11 connected to the drying zone 43 is welded on the upper end of the outer wall of the reactor 4. There are four discharge pipes 11, which are respectively located on one side of the outer wall of the reactor 4. The discharge pipes 11 extend obliquely downward to facilitate the outflow of lithium hexafluorophosphate in the discharge pipes 11. A cooling sleeve 12 is fixedly connected to the outer wall of the reactor 4 corresponding to the reaction zone 41. The cooling sleeve 12 forms a low temperature in the reaction zone 41 so that the reaction can proceed smoothly. A heating sleeve 13 is fixedly connected to the outer wall of the reactor 4 corresponding to the drying zone 43. The heating sleeve 13 forms a high temperature environment in the drying zone 43 so that the crystallized lithium hexafluorophosphate is quickly dried. A first electromagnet 14 located between the cooling sleeve 12 and the feed pipe 9 is fixedly connected to the outer wall of the reactor 4. When the first electromagnet 14 is energized, it can generate attraction with the magnet 25. A second electromagnet 15 located on the upper side of the discharge pipe 11 is fixedly connected to the outer wall of the reactor 4. When the second electromagnet 15 is energized, it can generate attraction with the magnet 25. In order to increase the reaction rate, an agitator 20 is rotatably mounted on the inner wall of the reactor 4, and a driving motor 21 for driving the agitator 20 to rotate is fixedly connected to the bottom of the reactor 4.

[0028] The dissolver 1 includes a body and a stirring device 2 installed in the body. Lithium fluoride and hydrofluoric acid are added into the body, and the stirring device 2 is started. The lithium fluoride is dissolved in the hydrofluoric acid to obtain a lithium hydrogen fluoride solution. The discharge port of the body is connected to the feed pipe 9 of the reactor 4 through a pipeline, and the lithium hydrogen fluoride solution in the dissolver 1 is added into the reactor 4.

[0029] The air inlet of the condenser 3 is connected to the air outlet pipe 10 of the reactor 4 through a pipeline, and the mixed gas of phosphorus pentafluoride and hydrogen fluoride in the reactor 4 enters the condenser 3. In the condenser 3, the hydrogen fluoride gas is pre-cooled and condensed into hydrogen fluoride liquid, and the phosphorus pentafluoride gas flows out from the air outlet. The air outlet of the condenser 3 is connected with a first connecting pipe 5 and a second connecting pipe 6 through a three-way joint, the first connecting pipe 5 is connected to the upper phosphorus pentafluoride air inlet pipe 8, and the second connecting pipe 6 is connected to the lower phosphorus pentafluoride air inlet pipe 7, so that the phosphorus pentafluoride gas is recycled. The hydrogen fluoride liquid is added to the dissolver 1 through the third connecting pipe, so that the hydrogen fluoride is recycled.

[0030] The working principle of the lithium hexafluorophosphate continuous production system of the present embodiment is as follows: lithium fluoride and hydrogen fluoride liquid are added to the dissolver 1, and under the action of the stirring device 2, the lithium fluoride is dissolved in the hydrogen fluoride solution to obtain a lithium hydrogen fluoride solution. The lithium hydrogen fluoride solution is added to the reactor 4 through the feed pipe 9, and phosphorus pentafluoride gas is introduced into the reaction zone 41 of the reactor 4 through the lower phosphorus pentafluoride inlet pipe 7, and the drive motor 21 is started, and the drive motor 21 drives the agitator 20 to rotate. The phosphorus pentafluoride gas reacts with the lithium hydrogen fluoride to generate lithium hexafluorophosphate. After the lithium hexafluorophosphate in the hydrogen fluoride solution reaches saturation, the newly generated lithium hexafluorophosphate crystallizes in the form of a solid and is suspended in the anhydrous hydrogen fluoride solution under the action of stirring. At this time, the filter plate assembly is located in the solution, and the filter plate 24 is pressed against the support edge under the action of the torsion spring. Start the reduction motor 18, the reduction motor 18 drives the screw rod 16 to rotate, and the screw rod 16 drives the filter plate assembly upward. During the upward movement of the filter plate assembly in the solution, the lithium hexafluorophosphate in the solution is collected and lifted upward. During the upward movement of the filter plate assembly, the gear 26 on the filter plate 24 rotates along the rack 27, the worm wheel rotates with the gear 26, the worm wheel drives the worm and the rotating shaft 28 to rotate, and the cam 29 rotates. During the rotation of the cam 29, the filter plate 24 is pushed to swing up and down around the hinge axis, and the lithium hexafluorophosphate flows on the filter plate 24, avoiding the lithium hexafluorophosphate from blocking the filter holes and reducing the filtering effect. During the process of the filter plate assembly being lifted from the buffer zone 42 to the drying zone 43, the lithium hexafluorophosphate is dried under the action of the phosphorus pentafluoride gas flow and the heating sleeve 13. During this process, the lithium hexafluorophosphate flows on the filter plate 24, improving the drying effect and drying efficiency of the lithium hexafluorophosphate. When the filter plate assembly is lifted to the position of the second electromagnet 15, the second electromagnet 15 is energized, and the filter plate 24 moves to the upper side of the horizontal position under the action of the cam 29. The magnet 25 drives the filter plate 24 to rotate around the hinge axis toward the second electromagnet 15 under the action of the second electromagnet 15, and the lithium hexafluorophosphate on the filter plate 24 falls into the discharge pipe 11 under the action of gravity and is discharged. After the lithium hexafluorophosphate is discharged, the second electromagnet 15 is de-energized, and the filter plate 24 rotates under the action of the torsion spring and is pressed against the support edge. The reduction motor 18 rotates in the opposite direction to drive the filter plate assembly downward. When the filter plate assembly descends to the position of the first electromagnet 14, the first electromagnet 14 is energized, and the filter plate 24 moves to the upper side of the horizontal position under the action of the cam 29. The magnet 25 drives the filter plate 24 to rotate around the hinge axis toward the first electromagnet 14 under the action of the first electromagnet 14, and the filter plate assembly continues to descend to the inside of the solution. When the filter plate assembly approaches the lower end of the screw rod 16, the magnet 25 is pressed against the inner wall of the reactor 4 under the action of the first electromagnet 14. The first electromagnet 14 is de-energized, and the filter plate 24 rotates under the action of the torsion spring and is pressed against the support edge. At this time, the lithium hexafluorophosphate in the solution is located on the upper side of the filter plate 24. Repeat the above steps to filter and dry the newly crystallized lithium hexafluorophosphate.The mixed gas of phosphorus pentafluoride and hydrogen fluoride in the buffer zone 42 enters the condenser 3 through the gas outlet pipe 10, and the hydrogen fluoride is condensed in the condenser 3 and added to the dissolver 1 through the third connecting pipe. The phosphorus pentafluoride gas enters the lower phosphorus pentafluoride gas inlet pipe 7 and the lower phosphorus pentafluoride gas inlet pipe 7 through the first connecting pipe 5 and the second connecting pipe 6 respectively.

[0031] In some embodiments, the filtering, lifting and discharging mechanism includes an auger 30 rotatably mounted in the reactor, the rotating shaft of the auger 30 extends into the motor fixing seat 17, and is fixedly connected to the output shaft of the reduction motor 18 through a coupling. A plurality of filter holes are provided on the blades of the auger 30, and the liquid in the solution passes through the filter holes, and the lithium hexafluorophosphate is collected on the spiral blades of the auger 30. In this embodiment, the reactor is arranged vertically, and the auger 30 is also arranged vertically. In other embodiments, the reactor and the auger 30 can also be arranged obliquely, which helps the auger 30 to transport the lithium hexafluorophosphate upward.

[0032] When the lithium hexafluorophosphate continuous production system of this embodiment is working, the reduction motor 18 drives the auger 30 to rotate, and the auger 30 filters and collects the lithium hexafluorophosphate in the solution, and lifts the lithium hexafluorophosphate upward to the drying area, wherein the heating sleeve and the phosphorus pentafluoride gas flow dry the lithium hexafluorophosphate, and the dried lithium hexafluorophosphate is discharged from the discharge pipe by the auger 30.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lithium hexafluorophosphate continuous production system, characterized in that: The invention comprises a dissolver, a condenser and a reactor. The interior of the reactor is divided into a reaction zone, a buffer zone and a drying zone from bottom to top. A lower phosphorus pentafluoride air inlet pipe is provided at the bottom of the reactor, an upper phosphorus pentafluoride air inlet pipe is provided at the top of the reactor, a feed pipe for feeding into the reaction zone is provided on the reactor, a discharge pipe is provided at the upper end of the outer wall of the reactor, the feed pipe is connected with the discharge port of the dissolver, an air outlet pipe connected with the buffer zone is provided on the reactor, the air outlet pipe is connected with the air inlet of the condenser, the air outlet of the condenser is respectively connected with the upper phosphorus pentafluoride air inlet pipe and the lower phosphorus pentafluoride air inlet pipe, a cooling jacket located outside the reaction zone and a heating jacket located outside the drying zone are provided on the reactor, and a filtering, lifting and discharging mechanism for filtering lithium hexafluorophosphate in the solution in the reaction zone, lifting it to the drying zone and discharging it from the discharge pipe is provided in the reactor.

2. The lithium hexafluorophosphate continuous production system according to claim 1, characterized in that: The filtering, lifting and discharging mechanism includes a screw rod rotatably installed in the reactor and a filter plate assembly guided and assembled in the reactor, the filter plate assembly cooperates with the screw rod, the filter plate assembly includes a fixed plate, a plurality of filter plates are hinged on the fixed plate, a torsion spring is provided on the hinge shaft of the filter plate to press the filter plate against the fixed plate, a magnet is provided at one end of the upper side of the filter plate, a first electromagnet located outside the reaction zone is provided on the reactor, the first electromagnet is energized to attract the magnet, a discharge pipe connected to the drying zone is provided on the reactor, a second electromagnet located outside the drying zone and on the upper side of the discharge pipe is provided on the reactor, the second electromagnet is attracted to the magnet after energization.

3. The lithium hexafluorophosphate continuous production system according to claim 2, characterized in that: The fixing plate is a concave plate with high edges and a low middle. A screw hole matching the screw rod is provided at the center of the fixing plate. The fixing plate is provided with a plurality of mounting holes evenly arranged along the circumference of the screw hole. The filter plate is hinged on the outer hole wall of the mounting hole, and the inner hole wall of the mounting hole is provided with a supporting edge for supporting the filter plate.

4. The lithium hexafluorophosphate continuous production system according to claim 3, characterized in that: The filter plate assembly includes a rotating shaft rotatably mounted on the lower side of the fixed plate and parallel to the filter plate, the rotating shaft is provided with a cam for driving the filter plate to rotate, a gear is rotatably mounted on the lower side of the fixed plate, a worm wheel is provided on the rotating shaft of the gear, a worm is provided on the rotating shaft, and a rack meshing with the gear is provided on the inner wall of the reactor.

5. The lithium hexafluorophosphate continuous production system according to claim 4, characterized in that: The cross section of the reactor is rectangular, the cross section of the fixing plate is rectangular, and there are four mounting holes, each of which is in an isosceles trapezoid.

6. The lithium hexafluorophosphate continuous production system according to claim 1, characterized in that: The filtering, lifting and discharging mechanism comprises an auger rotatably installed in the reactor, a reduction motor driving the auger to rotate is arranged on the reactor, and filter holes are arranged on the spiral blades of the auger.

7. The lithium hexafluorophosphate continuous production system according to claim 6, characterized in that: The reactor is arranged obliquely, and the auger is arranged coaxially with the reactor.

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