A lithium hexafluorophosphate crystal concentration device

Abstract

The present application relates to lithium hexafluorophosphate crystal separation technical field, especially to a kind of lithium hexafluorophosphate crystal's concentration device, including cylinder, cylinder top is closed by closure lid, closure lid top is equipped with feed pipe, filter basket is equipped in cylinder, filter screen is equipped on the lateral wall of filter basket, cylinder bottom is equipped with discharge pipe and liquid discharge pipe, discharge pipe is connected with the discharge end of filter basket, liquid discharge pipe is located between filter screen and cylinder inner wall, moving block is equipped below feed pipe, moving block includes upper block and lower block, the outer circumferential surface of lower block and the inner circumferential surface of filter basket form the gap one with uniform width, moving block moves up and down, for adjusting the width of gap one, mother liquor flows into cylinder along gap one after from feed pipe, solution without lithium hexafluorophosphate crystal is sent out from liquid discharge pipe by filter screen, solution containing lithium hexafluorophosphate crystal is sent out from discharge pipe along gap one.The specific gravity of lithium hexafluorophosphate crystal contained in the solution treated by the present application increases, and the separation efficiency of solid-liquid separator is improved.

Description

Technical Field

[0001] This invention relates to the field of lithium hexafluorophosphate crystal separation technology, and more particularly to a lithium hexafluorophosphate crystal concentration device. Background Technology

[0002] Lithium hexafluorophosphate is a key raw material for lithium-ion battery electrolytes. A common preparation method involves adding lithium fluoride and anhydrous hydrogen fluoride to a reactor under inert gas protection to prepare a hydrofluoric acid solution of lithium fluoride. Then, dichlorohexafluorophosphate is added to the lithium fluoride hydrofluoric acid solution, and the mixture is stirred to form a suspension. The dichlorohexafluorophosphate and lithium fluoride react at a temperature of 16–60°C for 4–6 hours to form a hydrofluoric acid solution of lithium hexafluorophosphate. Under certain conditions, lithium hexafluorophosphate crystals precipitate from this solution, and after filtration, the lithium hexafluorophosphate product is obtained.

[0003] Chinese utility model patent CN 217613183 U discloses a continuous solid-liquid separator for the preparation of lithium hexafluorophosphate, which directly adds a solution containing lithium hexafluorophosphate crystals into the feed pipe. However, in actual production, the lithium hexafluorophosphate crystals in the solution have a low specific gravity. Direct solid-liquid separation without concentration will lead to a decrease in the separation efficiency of the solid-liquid separator, which contradicts the concept of energy saving and efficiency improvement. Summary of the Invention

[0004] This invention provides a device for concentrating lithium hexafluorophosphate crystals. The device filters a solution containing lithium hexafluorophosphate crystals, increasing the specific gravity of the lithium hexafluorophosphate crystals in the treated solution. This results in a solid-liquid separator separating more lithium hexafluorophosphate crystals when processing the same volume of solution, thus improving the separation efficiency of the solid-liquid separator.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] A device for concentrating lithium hexafluorophosphate crystals includes a cylindrical body, the top of which is sealed by a cap. A feed pipe is located on the top of the cap. A filter hopper is located inside the cylindrical body, and a filter screen is provided on the side wall of the filter hopper. A discharge pipe and a drain pipe are located at the bottom of the cylindrical body. The discharge pipe is connected to the outlet end of the filter hopper, and the drain pipe is located between the filter screen and the inner wall of the cylindrical body. A movable block that can move vertically is located below the feed pipe. The movable block includes an upper block and a lower block, which are conical or frustum-shaped. The upper block has a diameter that gradually increases from top to bottom, while the lower block has a diameter that gradually decreases from top to bottom. The moving block is coaxially arranged with the filter hopper so that a uniformly wide gap 1 is formed between the outer circumferential surface of the lower block and the inner circumferential surface of the filter hopper. The moving block moves up and down to adjust the width of the gap 1. After the mother liquor flows into the cylinder from the feed pipe, it leaves along the gap 1. The solution without lithium hexafluorophosphate crystals passes through the filter screen and is sent out from the drain pipe, while the solution containing lithium hexafluorophosphate crystals is sent out from the discharge pipe along the gap 1.

[0007] The beneficial effects are: the filter funnel filters out the portion of the solution that does not contain lithium hexafluorophosphate crystals, concentrating the mother liquor and increasing the specific gravity of lithium hexafluorophosphate crystals per unit volume of liquid, thereby improving the separation efficiency of the solid-liquid separator; when the specific gravity of lithium hexafluorophosphate crystals in the mother liquor entering from the feed pipe is low, the moving block is lowered, the width of gap one is reduced, and the residence time of the mother liquor in gap one is increased, allowing more solution to be filtered out; when the specific gravity of lithium hexafluorophosphate crystals in the mother liquor is high, the moving block is raised, gap one is increased, allowing the mother liquor to flow through quickly, ensuring that the specific gravity of lithium hexafluorophosphate crystals in the mother liquor after treatment by this device is within a certain range, facilitating the control of the subsequent solid-liquid separator section.

[0008] Furthermore, the top side wall of the filter hopper is provided with a flange, the sealing cover is detachably connected to the cylinder, the sealing cover and the cylinder form a groove that fits the flange, and the discharge end of the filter hopper is detachably connected to the discharge pipe.

[0009] Furthermore, the bottom of the filter hopper is vertically provided with an outlet pipe, the discharge pipe is connected to the outlet pipe, a fixing cylinder is fixedly provided on the outer circumferential surface of the outlet pipe, a groove is formed between the fixing cylinder and the outer circumferential surface of the outlet pipe that is adapted to the top of the discharge pipe, and the top surface of the discharge pipe is in vertical contact with the inner top surface of the fixing cylinder.

[0010] The beneficial effects are: the filter can be removed by opening the closed cover, making it convenient to inspect and replace the filter; the first and second slots provide good support for the filter, ensuring the stability of the filter 5 during the filtration process.

[0011] Furthermore, a fixed cylinder two is fixedly installed on the upper block. The upper end of the fixed cylinder two is fitted outside the feed pipe located inside the cylinder. The lower end of the fixed cylinder two is provided with a through hole one for the liquid to flow down evenly along the outer circumference of the upper end of the moving block. The component that drives the moving block to move up and down includes a rotating rod one that is rotatably connected to the feed pipe through a rotating shaft one, and a connecting rod that is rotatably provided between the end of the rotating rod one and the moving block. The rotating shaft two extends radially along the feed pipe and one end is located outside the closed cover. The rotating shaft two rotates around its own axis, driving the rotating rod one to rotate up and down, so that the moving block moves up and down under the limitation of the fixed cylinder two and the feed pipe.

[0012] Furthermore, a worm gear is fixed at one end of the rotating shaft located outside the closed cover, and a worm gear meshing with the worm gear is rotatably mounted on the feed pipe. The rotation of the worm gear drives the rotating shaft to rotate around its own axis.

[0013] Beneficial effects: By turning the worm gear located outside the cylinder, the worm wheel is driven to rotate. The worm wheel drives the rotating shaft to rotate around its own axis, which in turn drives the rotating rod to rotate up and down, changing the angle between the rotating rod and the connecting rod. Under the limit of the fixed cylinder and the feed pipe, the moving block is driven to move up and down, thereby adjusting the gap. The adjustment is simple and convenient.

[0014] Furthermore, a flow guide cap is fixed on the fixed cylinder 2, and a cavity 2 communicating with the through hole 1 is provided inside the flow guide cap. A frustum-shaped annular arc plate is provided on the bottom end surface of the flow guide cap, and the diameter of the annular arc plate increases from top to bottom. A gap 2 for the mother liquor to pass through is provided between the annular arc plate and the outer peripheral surface of the top of the moving block.

[0015] The beneficial effects are: under the action of the guide cap, the mother liquor flows evenly into the gap 1 along the outer circumference of the upper end of the conical or frustum-shaped moving block, resulting in uniform filtration and making it easier for staff to predict the content of lithium hexafluorophosphate crystals in the filtered liquid.

[0016] Furthermore, an overflow port is provided on the side wall of the cylinder, and the axis of the overflow port is flush with the top of the discharge pipe.

[0017] The beneficial effect is that the overflow port axis is flush with the top of the discharge pipe, preventing the filtered solution without lithium hexafluorophosphate from flowing back into the outlet pipe along the filter screen.

[0018] Furthermore, a fixed cylinder three is vertically fixed inside the cavity formed by the closed cover and the cylinder body. The bottom end face of the fixed cylinder three is provided with a through hole for liquid to enter. The top of the fixed cylinder three is closed by a rotating cover. The rotating cover rotates around a rotating shaft perpendicular to the axis of the feed pipe. A floating block is provided on the bottom surface of the rotating cover. The floating block is located inside the fixed cylinder three. The closed cover is provided with an observation port and an observation mirror that closes the observation port. The observation mirror is used to observe the rotation angle of the rotating cover to determine the height of the mother liquor in the cavity one.

[0019] The beneficial effects are: the filter screen will gradually become clogged after a long period of use. When the feeding conditions remain unchanged, the liquid level in cavity one gradually increases, and the liquid level in fixed cylinder three increases synchronously. The floating block comes into contact with the liquid and gradually rotates upward under the action of buoyancy. The height of the liquid level can be determined by observing the rotation angle of the rotating cover, which is convenient for observation.

[0020] Furthermore, a fixed rod is fixed on the three side walls of the fixed cylinder. A sliding rod is slidably connected to the fixed rod along a direction that is perpendicular to both the first rotating shaft and the feed pipe axis. A second rotating rod is rotatably connected between the sliding rod and the rotating cover. The second rotating rod and the floating block are located on both sides of the first rotating shaft. A vertical rod is fixedly connected to the sliding rod. The observation mirror is used to observe the position of the top of the vertical rod.

[0021] The beneficial effects are: the rotation angle of the rotating cap is converted into the position change of the top of the vertical rod, and the liquid level of the fixed cylinder can be obtained by observing the position of the top of the vertical rod inside the observation mirror. The small size of the observation mirror ensures the strength of the sealing cap.

[0022] Furthermore, a perforated plate is fixed inside the fixed cylinder three, and the perforated plate is used to place the floating block.

[0023] The beneficial effect is that placing the float block on the perforated plate prevents the float block from falling too far downwards, causing the rotating rod to self-lock, thus ensuring that the results observed inside the observation microscope are accurate and reliable. Attached Figure Description

[0024] Figure 1 This is a front view of the first embodiment of the present invention;

[0025] Figure 2 for Figure 1 A sectional view along section AA;

[0026] Figure 3 for Figure 2 A schematic diagram showing the disassembled structure of the outlet pipe and discharge pipe at section B;

[0027] Figure 4 for Figure 2 A schematic diagram of the structure of the flange and slot 1 at part C;

[0028] Figure 5 This is a schematic diagram of the flow guide cap and drive assembly;

[0029] Figure 6 This is a schematic diagram of the structure of the observation mirror and the top of the vertical rod in the second embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the installation structure of the fixed cylinder three;

[0031] Figure 8This is a schematic diagram of the internal structure and connecting components of the fixed cylinder.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Cylinder; 2. Sealing cover; 3. Cavity 1; 4. Feed pipe; 5. Filter hopper; 6. Outlet pipe; 7. Discharge pipe; 8. Drain pipe; 9. Flange; 10. Slot 1; 11. Fixed cylinder 1; 12. Slot 2; 13. Moving block; 14. Fixed cylinder 2; 15. Through hole 1; 16. Cavity 2; 17. Guide cap; 18. Annular arc plate; 19. Gap 2; 20. Rotating shaft 1; 21. Rotating rod 1; 22. Connecting rod; 23. Worm gear; 24. 25. Bearing housing; 26. Worm gear; 27. Clearance 1; 28. Overflow port; 29. ​​Fixed cylinder 3; 30. Rotating cover; 31. Base; 32. Rotating shaft 2; 33. Connecting plate; 34. Floating block; 35. Fixed rod; 36. Sliding rod; 37. Protrusion; 38. Slide groove; 39. Rotating rod 2; 40. Vertical rod; 41. Observation port; 42. Perforated plate; 43. Upper block; 44. Lower block; 45. Through hole 2; 46. Bolt; 47. Observation mirror. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0035] Example 1

[0036] like Figures 1-5 The diagram shown is a structural schematic of the first embodiment of the present invention, a lithium hexafluorophosphate crystal concentration device, comprising a cylindrical body 1 with an open top, the top of which is sealed with a cap 2, as shown. Figure 1 and Figure 2 As shown, flanges are provided at the top of the cylinder 1 and the bottom of the sealing cover 2. The two flanges are detachably connected by bolts 45. The sealing cover 2 and the cylinder 1 enclose a cavity 3.

[0037] A feed pipe 4 is fixed to the top of the sealed cover 2. A filter hopper 5 is provided inside the cylinder 1. The filter hopper 5 is a conical filter hopper, and a filter screen made of high-purity PTFE microporous membrane is provided on the side wall of the filter hopper 5. An outlet pipe 6 is vertically fixed to the bottom of the filter hopper 5. A discharge pipe 7 and a drain pipe 8 are fixed to the bottom of the cylinder 1. The discharge pipe 7, located inside the cylinder 1, is fitted outside the outlet pipe 6. The drain pipe 8 is located between the outer circumference of the filter hopper 5 and the inner wall of the cylinder 1. The mother liquor enters the filter hopper 5 through the feed pipe 4. The portion of the solution that does not contain lithium hexafluorophosphate crystals passes through the filter screen and is led out through the drain pipe 8. The lithium hexafluorophosphate crystals cannot pass through the filter screen, and the solution containing lithium hexafluorophosphate crystals is led out through the discharge pipe 7.

[0038] like Figure 2 and Figure 4 As shown, an annular flange 9 is fixed to the top side wall of the filter hopper 5. Annular grooves are respectively provided on the opposite end faces of the flanges on the sealing cover 2 and the cylinder 1. The two annular grooves form a retaining groove 10 that fits the flange 9. The flange 9 is located within the retaining groove 10. After the bolts 45 are installed, the flange 9 is pressed tightly by the sealing cover 2 and the cylinder 1. Figure 2 and Figure 3 As shown, a fixing cylinder 11 is fixed on the outer circumferential surface of the outlet pipe 6. A groove 2 12 is formed between the inner wall of the fixing cylinder 11 and the outer circumferential surface of the outlet pipe 6, which is adapted to the top of the discharge pipe 7. The top surface of the discharge pipe 7 is in perpendicular contact with the inner top surface of the fixing cylinder 11. At this time, the sealing cover 2 can be opened to remove the filter hopper 5, which is convenient for the inspection and replacement of the filter hopper 5.

[0039] A movable block 13 is provided inside cavity 3. The movable block 13 is located below the feed pipe 4 and can move vertically. The movable block 13 includes an upper block 42 and a lower block 43 in the shape of a frustum. The diameter of the upper block 42 gradually increases from top to bottom, and the diameter of the lower block 43 gradually decreases from top to bottom. The movable block 13 is coaxially arranged with the filter hopper 5, the feed pipe 4, and the discharge pipe 7. A uniformly wide gap 26 is formed between the outer circumferential surface of the lower block 43 and the inner circumferential surface of the filter hopper 5. A fixed cylinder 14 is fixed on the upper block 42. The upper end of the fixed cylinder 14 is fitted outside the feed pipe 4 located inside the cylinder 1. The inner circumferential surface of the fixed cylinder 14 is in contact with the outer circumferential surface of the feed pipe 4. The lower end of the fixed cylinder 14 is provided with a through hole 15 for liquid to flow down uniformly along the outer circumferential surface of the upper end of the movable block 13. The mother liquor flows in from the feed pipe 4 and flows out from the through hole 15. A flow guide cap 17 is fixed on the fixed cylinder 14. The flow guide cap 17 has a cavity 16 communicating with the through hole 15. A frustum-shaped annular arc plate 18 is provided on the bottom surface of the flow guide cap 17. The diameter of the annular arc plate 18 increases sequentially from top to bottom. A gap 19 is provided between the annular arc plate 18 and the outer peripheral surface of the top of the moving block 13 to allow the lithium hexafluorophosphate solution to pass through. Under the control of the gap 19, the mother liquor flows evenly down the outer peripheral surface of the upper end of the moving block 13.

[0040] like Figure 1 , Figure 2 and Figure 5 As shown, the component that drives the moving block 13 to move up and down includes a rotating rod 21 rotatably connected to the feed pipe 4 via a rotating shaft 20, and a connecting rod 22 rotatably disposed between the end of the rotating rod 21 and the moving block 13. One end of the connecting rod 22 is rotatably connected to one end of the rotating rod 21, and the other end is rotatably connected to the top surface of the moving block 13. The rotating shaft 20 extends radially along the feed pipe 4 and one end is located outside the sealing cover 2. A worm gear 23 is fixedly provided at the end of the rotating shaft 20 located outside the sealing cover 2. A bearing seat 24 is fixedly provided on the feed pipe 4. A worm 25 that meshes with the worm gear 23 is rotatably provided inside the bearing seat 24. A handle is fixedly provided at the top of the worm 25. Turning the handle drives the worm 25 to rotate, thereby causing the rotating shaft 20 to rotate around its own axis, so as to drive the rotating rod 21 to rotate up and down, so that the moving block 13 moves up and down under the limitation of the fixed cylinder 14 and the feed pipe 4. The rotating worm gear 25 causes the moving block 13 to move up and down, adjusting the width of the gap 26. When the mother liquor entering from the feed pipe 4 contains lithium hexafluorophosphate crystals with a low specific gravity, the moving block 13 is lowered to reduce the width of the gap 26, increasing the residence time of the mother liquor in the gap 26 and allowing more solution to be filtered out. When the mother liquor contains lithium hexafluorophosphate crystals with a high specific gravity, the moving block 13 is raised to increase the width of the gap 26, allowing the mother liquor to flow through quickly and ensuring that the specific gravity of lithium hexafluorophosphate in the mother liquor after treatment by this device is within a certain range, facilitating control of the subsequent solid-liquid separator section. To prevent the filtered solution without lithium hexafluorophosphate from flowing back along the filter screen into the outlet pipe 6 and affecting the concentration results, an overflow port 27 is provided on the side wall of the cylinder 1, with the axis of the overflow port 27 flush with the top of the discharge pipe 7.

[0041] Example 2

[0042] like Figures 6-8 The diagram shown is a structural schematic of the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that a fixed cylinder 28 is vertically fixed inside the cavity 3. In this embodiment, as shown... Figure 2 As shown, the fixed cylinder 28 is fixed to the inner wall of the closed cover 2. The fixed cylinder 28 is a rectangular shell structure with openings at the top and bottom. The bottom end of the fixed cylinder 28 has a through hole 44, through which liquid enters the fixed cylinder 28 from bottom to top. The top of the fixed cylinder 28 is closed by a rotating cover 29. Figure 8As shown, a base 30 is fixed on the top surface of the fixed cylinder 28. A rotating shaft 31, perpendicular to the axis of the feed pipe 4, is rotatably connected inside the base 30. The two ends of the rotating shaft 31 are fixedly connected to the bottom surface of the rotating cover 29 through connecting plates 32. At this time, the rotating cover 29 can rotate around the rotating shaft 31. A floating block 33 is fixedly installed on the bottom surface of the rotating cover 29, and the floating block 33 is located inside the fixed cylinder 28. A fixed rod 34 is vertically fixed on the side wall of the fixed cylinder 28. A sliding rod 35 is slidably connected inside the fixed rod 34. Protrusions 36 are fixed on both sides of the sliding rod 35. A groove 37 that matches the protrusions 36 is provided on the inner side wall of the fixed rod 34. The protrusions 36 and the groove 37 cooperate to guide the sliding rod 35 to slide in a direction that is perpendicular to both the axis of the rotating shaft 20 and the axis of the feed pipe 4. A second rotating rod 38 is rotatably connected between the sliding rod 35 and the rotating cover 29. One end of the second rotating rod 38 is rotatably connected to the end of the rotating cover 29 away from the float block 33, and the other end is rotatably connected to the end of the sliding rod 35 near the fixed cylinder 28. At this time, the second rotating rod 38 and the float block 33 are located on opposite sides of the rotating shaft 20. When the liquid level rises, the float block 33 moves upward under the action of buoyancy, the rotating cover 29 rotates, and the sliding rod 35 is pushed to slide away from the fixed cylinder 28 through the action of the connecting rod 22. A vertical rod 39 is fixedly attached to the sliding rod 35. Figure 1 and Figure 6 As shown, the closed cover 2 is equipped with an observation port 40 and an observation mirror 46 that closes the observation port 40. The observation mirror 46 is used to observe the position of the top of the vertical rod 39. The position of the vertical rod 39 corresponds one-to-one with the rotation angle of the rotating cover 29 and the liquid level. If the position of the vertical rod 39 is found to have moved during inspection, it indicates that the liquid level in cavity 3 has changed, requiring closer inspection and timely replacement or cleaning of the filter screen.

[0043] To prevent the rotating rod 38 from locking itself, a perforated plate 41 is fixed inside the fixed cylinder 28. When the liquid level does not reach the perforated plate 41, the floating block 33 is placed on the perforated plate 41.

[0044] Example 3

[0045] The difference between this embodiment and Embodiment 1 is that the flange of the sealing cover 2 is provided with an annular groove 2. The flange of the sealing cover 2 and the flange on the cylinder 1 are surrounded to form a retaining groove 10 that fits the flange 9. After the bolts 45 are installed, the flange 9 is pressed together by the sealing cover 2 and the cylinder 1. Similarly, the annular groove 2 can also be provided on the flange on the cylinder 1.

Claims

1. A device for concentrating lithium hexafluorophosphate crystals, characterized in that, The device includes a cylindrical body (1), the top of which is closed by a sealing cap (2), and a feed pipe (4) is provided on the top of the sealing cap (2). A filter hopper (5) is provided inside the cylindrical body (1), and a filter screen is provided on the side wall of the filter hopper (5). A discharge pipe (7) and a drain pipe (8) are provided at the bottom of the cylindrical body (1). The discharge pipe (7) is connected to the discharge end of the filter hopper (5), and the drain pipe (8) is located between the filter screen and the inner wall of the cylindrical body (1). A movable block (13) that can move in the vertical direction is provided below the feed pipe (4). The movable block (13) includes an upper block (42) and a lower block (43) that are conical or frustum-shaped. The diameter of the upper block (42) gradually increases from top to bottom, and the diameter of the lower block (43) gradually decreases from top to bottom. The moving block (13) is coaxially arranged with the filter hopper (5) so that a uniformly wide gap (26) is formed between the outer circumferential surface of the lower block (43) and the inner circumferential surface of the filter hopper (5). The moving block (13) moves up and down to adjust the width of the gap (26). The mother liquor flows into the cylinder (1) from the feed pipe (4) and then flows down along the gap (26). The solution without lithium hexafluorophosphate crystals is sent out through the filter screen from the drain pipe (8), and the solution containing lithium hexafluorophosphate crystals is sent out along the gap (26) from the discharge pipe (7). A fixed cylinder two (14) is fixed on the upper block (42). The upper end of the fixed cylinder two (14) is fitted outside the feed pipe (4) located inside the cylinder (1). The lower end of the fixed cylinder two (14) is provided with a through hole one (15) for liquid to flow evenly down along the outer circumference of the upper end of the moving block (13). The component that drives the moving block (13) to move up and down includes a rotating rod one (21) rotatably connected to the feed pipe (4) via a rotating shaft one (20) and a connecting rod (22) rotatably provided between the end of the rotating rod one (21) and the moving block (13). The rotating shaft one (20) extends radially along the feed pipe (4) and one end is located outside the closed cover (2). The rotating shaft one (20) rotates around its own axis and drives the rotating rod one (21) to rotate up and down, so that the moving block (13) moves up and down under the limitation of the fixed cylinder two (14) and the feed pipe (4). A flow guide cap (17) is fixed on the fixed cylinder (14). The flow guide cap (17) has a cavity (16) inside that communicates with the through hole (15). A frustum-shaped annular arc plate (18) is provided on the bottom surface of the flow guide cap (17). The diameter of the annular arc plate (18) increases from top to bottom. A gap (19) is provided between the annular arc plate (18) and the outer circumference of the upper block (42) for the mother liquor to pass through.

2. The lithium hexafluorophosphate crystal concentration apparatus according to claim 1, characterized in that, The filter hopper (5) has a flange (9) on its top side wall. The sealing cover (2) is detachably connected to the cylinder (1). The sealing cover (2) and the cylinder (1) form a groove (10) that fits the flange (9). The discharge end of the filter hopper (5) is detachably connected to the discharge pipe (7).

3. The lithium hexafluorophosphate crystal concentration apparatus according to claim 2, characterized in that, The bottom end of the filter hopper (5) is provided with a vertical outlet pipe (6), the discharge pipe (7) is connected to the outlet pipe (6), a fixing cylinder (11) is fixed on the outer circumferential surface of the outlet pipe (6), a groove (12) is formed between the fixing cylinder (11) and the outer circumferential surface of the outlet pipe (6) to fit the top end of the discharge pipe (7), and the top end of the discharge pipe (7) is in vertical contact with the inner top surface of the fixing cylinder (11).

4. The lithium hexafluorophosphate crystal concentration apparatus according to claim 3, characterized in that, A worm gear (23) is fixed at one end of a rotating shaft (20) located outside the closed cover (2). A worm (25) that meshes with the worm gear (23) is rotatably mounted on the feed pipe (4). The worm (25) rotates, driving the rotating shaft (20) to rotate around its own axis.

5. A lithium hexafluorophosphate crystal concentration apparatus according to any one of claims 1-4, characterized in that... An overflow port (27) is provided on the side wall of the cylinder (1), and the axis of the overflow port (27) is flush with the top of the discharge pipe (7).

6. The lithium hexafluorophosphate crystal concentration apparatus according to claim 5, characterized in that, A fixed cylinder three (28) is vertically fixed inside the cavity one (3) formed by the closed cover (2) and the cylinder (1). The bottom end face of the fixed cylinder three (28) is provided with a through hole two (44) for liquid to enter. The top of the fixed cylinder three (28) is closed by a rotating cover (29). The rotating cover (29) rotates around a rotating shaft two (31) perpendicular to the axis of the feed pipe (4). A floating block (33) is provided on the bottom surface of the rotating cover (29). The floating block (33) is located inside the fixed cylinder three (28). The closed cover (2) is provided with an observation port (40) and an observation mirror (46) for closing the observation port (40). The observation mirror (46) is used to observe the rotation angle of the rotating cover (29) to determine the height of the mother liquor in the cavity one (3).

7. The lithium hexafluorophosphate crystal concentration apparatus according to claim 6, characterized in that, A fixed rod (34) is fixed on the side wall of the fixed cylinder three (28). The fixed rod (34) is guided and slidably connected to a sliding rod (35) in a direction that is perpendicular to the axis of the rotating shaft two (31) and the feed pipe (4). The sliding rod (35) is rotatably connected to the rotating cover (29) and the rotating rod two (38). The rotating rod two (38) and the floating block (33) are located on both sides of the rotating shaft two (31). A vertical rod (39) is vertically fixed on the sliding rod (35). The observation mirror (46) is used to observe the position of the top of the vertical rod (39).

8. The lithium hexafluorophosphate crystal concentration apparatus according to claim 7, characterized in that, A perforated plate (41) is fixed inside the fixed cylinder (28), and the perforated plate (41) is used to place the floating block (33).

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