Lithium hexafluorophosphate solid-liquid separation device

Abstract

The utility model relates to a lithium hexafluorophosphate solid-liquid separation device. The lithium hexafluorophosphate solid-liquid separation device comprises a shell, the shell is internally provided with a mixing cavity and a separation cavity which are separated through a partition plate, the mixing cavity is internally provided with a stirring mechanism, the separation cavity is internally provided with a filter plate, the partition plate is provided with a spraying pipe which is communicated with the mixing cavity and sprays raw materials to the filter plate, and the filter plate is provided with a discharging opening. A discharging box located on the lower side of the discharging opening is arranged in the separation cavity, a scraping plate located on the upper side of the filter plate and used for scraping solids on the upper side of the filter plate into the discharging opening is rotationally installed in the shell, a filter screen is hinged to the interior of the discharging box, a discharging opening located on the upper side of the filter screen is formed in the shell, and a cam driving the filter screen to swing up and down around a hinged shaft is rotationally installed in the discharging box. And a driving mechanism for driving the cam and the scraping plate to rotate is arranged on the shell. Compared with the prior art, the lithium hexafluorophosphate solid-liquid separation device disclosed by the utility model has the advantages that the blockage of the filter plate caused by the lithium hexafluorophosphate solid is avoided, the filtering effect of the filter plate is improved, and the solid-liquid separation effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium hexafluorophosphate production equipment, and particularly relates to a solid-liquid separation device for lithium hexafluorophosphate. Background Art

[0002] Lithium hexafluorophosphate has always been the most important electrolyte lithium salt used in commercial lithium batteries. At present, the preparation method of lithium hexafluorophosphate is to first rectify and purify anhydrous hydrogen fluoride to obtain high-purity anhydrous hydrogen fluoride, then dissolve lithium fluoride in high-purity anhydrous hydrogen fluoride to obtain an anhydrous hydrogen fluoride solution containing lithium fluoride, and then add phosphorus pentachloride to prepare a saturated solution of lithium hexafluorophosphate. Finally, the saturated solution of lithium hexafluorophosphate is subjected to low-temperature crystallization, solidification separation, drying, pulverization and packaging to obtain a lithium hexafluorophosphate product.

[0003] The Chinese utility model patent with the authorization announcement number CN207886730U discloses a purification separator for lithium hexafluorophosphate. The purification separator includes a bracket and a tank body arranged on the bracket. A spraying plate is arranged inside the tank body. The upper part of the spraying plate is a filtering chamber, and the lower part of the spraying plate is a crystallization chamber. An impurity filtering plate is arranged inside the filtering chamber, and a layer of clamping plate is arranged outside the crystallization chamber. The separator of the utility model has a fast crystallization speed and a high crystallization rate. However, during the use of the purification separator for lithium hexafluorophosphate, after the mixture of crystals and solution passes through the filtration of the crystal filtering plate, the crystals finally remain on the crystal filtering plate. However, with the progress of filtration, the crystals will accumulate on the crystal filtering plate, reducing the filtering effect of the crystal filtering plate. Summary of the Utility Model

[0004] In order to solve the above technical problems, the utility model provides a solid-liquid separation device for lithium hexafluorophosphate.

[0005] The technical solution of the solid-liquid separation device for lithium hexafluorophosphate of the utility model is as follows:

[0006] The solid-liquid separation device for lithium hexafluorophosphate includes a housing. A mixing chamber and a separation chamber are separated by a partition inside the housing. A stirring mechanism is arranged in the mixing chamber. A filter plate is arranged in the separation chamber. A spraying pipe communicating with the mixing chamber and spraying raw materials onto the filter plate is arranged on the partition. A discharge port is arranged on the filter plate. A discharge box located below the discharge port is arranged in the separation chamber. A scraper rotatingly installed in the housing above the filter plate and scraping the solids above the filter plate into the discharge port is arranged. A filter screen is hinged in the discharge box. An outlet located above the filter screen is arranged on the housing. A cam rotatingly installed in the discharge box and driving the filter screen to swing up and down around the hinge axis is arranged. A driving mechanism for driving the cam and the scraper to rotate is arranged on the housing.

[0007] Furthermore, the stirring mechanism includes a stirring shaft and a driving motor. The driving motor is fixedly connected to the upper side of the housing through a motor fixing seat. The stirring shaft includes a central shaft. A plurality of horizontally extending connecting rods are fixedly connected to the upper end of the central shaft. Stirring rods are fixedly connected to the lower sides of the ends of the connecting rods. An auger is provided below the central shaft. A sleeve sleeved outside the auger is provided on the partition plate. The partition plate is fixedly connected to the sleeve through a fixing rod.

[0008] Furthermore, the partition plate is a conical plate convex downward at the center. The spray pipe is in an L shape. The upper end of the vertical section of the spray pipe is fixedly connected to the center of the lower end of the partition plate. A plurality of nozzles are provided on the lower side of the horizontal section of the spray pipe. A discharge valve is provided on the vertical section of the spray pipe.

[0009] Furthermore, a feed pipe communicating with the mixing chamber is fixedly connected to the upper end of the housing. The lower end of the housing is in a conical structure. A discharge pipe is provided at the center of the lower end of the housing.

[0010] Furthermore, an installation rod is fixedly connected to the lower end of the scraper. A perforation for the installation rod to pass through is provided on the filter plate. An installation plate is fixedly connected to the discharge box. The installation rod is installed on the installation plate through a bearing. The rotating shaft of the cam is rotatably installed on the discharge box through a bearing. The rotating shaft of the cam extends out of the outside of the discharge box.

[0011] Furthermore, the driving mechanism includes a reduction motor, a transmission shaft, a driving bevel gear, a first driven bevel gear, and a second driven bevel gear. The reduction motor is fixedly connected to the outer wall of the housing through a motor fixing seat. The end of the transmission shaft is rotatably installed in the housing through a bearing. The end of the transmission shaft is fixedly connected to the output shaft of the reduction motor through a coupling. The driving bevel gear is fixedly connected to the end of the transmission shaft. The first driven bevel gear is fixedly connected to the end of the rotating shaft of the cam. The second driven bevel gear is fixedly connected to the lower end of the installation rod.

[0012] Furthermore, a collection box communicating with the discharge port is provided on the housing. A support plate for horizontally supporting the filter screen is provided on the inner wall of the discharge box. A torsion spring for pressing the filter screen against the support plate is provided on the hinge shaft of the filter screen.

[0013] The utility model provides a lithium hexafluorophosphate solid-liquid separation device, and its beneficial effects are:

[0014] When the lithium hexafluorophosphate solid-liquid separation device of the present utility model is in use, the lithium hexafluorophosphate raw material liquid to be solid-liquid separated is added into the mixing cavity through the feed pipe. The driving motor drives the stirring shaft to rotate. The stirring rods in the stirring shaft stir the lithium hexafluorophosphate raw material liquid in the mixing cavity, and the auger in the stirring shaft turns the lithium hexafluorophosphate raw material liquid at the bottom upward, improving the mixing effect of the lithium hexafluorophosphate raw material liquid. The discharge valve opens and closes intermittently. The uniformly mixed lithium hexafluorophosphate raw material liquid drops onto the filter plate intermittently through the spray pipe, and the solidified lithium hexafluorophosphate accumulates on the filter plate. The reduction motor starts, and the reduction motor drives the scraper to rotate and the filter screen to swing up and down around the hinge shaft. During the rotation of the scraper, the solidified lithium hexafluorophosphate on the filter plate is scraped into the discharge box. After being filtered again on the filter screen, it enters the collection box from the discharge port under the action of gravity, realizing the solid-liquid separation of the lithium hexafluorophosphate raw material liquid. Compared with the prior art, the lithium hexafluorophosphate solid-liquid separation device of the present utility model avoids the blockage of the filter plate caused by lithium hexafluorophosphate solids, improves the filtering effect of the filter plate, and improves the solid-liquid separation effect. The lithium hexafluorophosphate solid-liquid separation device of the present utility model improves the uniformity of the lithium hexafluorophosphate raw material liquid by setting up a stirring mechanism, which helps the lithium hexafluorophosphate raw material liquid entering the filter plate to be more uniform and helps to improve the filtering effect of the filter plate. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the lithium hexafluorophosphate solid-liquid separation device of the present utility model;

[0016] Figure 2 is Figure 1 an enlarged view of part A in

[0017] Figure 3 is Figure 1 an enlarged view of part B in

[0018] In the figure: 1, housing; 2, mixing cavity; 3, separation cavity; 4, feed pipe; 5, discharge pipe; 6, spray pipe; 7, discharge valve; 8, driving motor; 9, central shaft; 10, connecting rod; 11, stirring rod; 12, auger; 13, sleeve; 14, fixed rod; 15, partition; 16, filter plate; 17, discharge port; 18, scraper; 19, discharge box; 20, discharge port; 21, collection box; 22, filter screen; 23, reduction motor; 24, transmission shaft; 25, cam; 26, support plate; 27, mounting plate; 28, mounting rod; 29, driving bevel gear; 30, first driven bevel gear; 31, second driven bevel gear. Detailed Embodiments

[0019] The following further describes the present utility model in detail with reference to the drawings and specific embodiments:

[0020] A specific embodiment of the lithium hexafluorophosphate solid-liquid separation device of the present utility model is as shown in Figure 1 、Figure 2 , Figure 3 As shown in Figure 3 , it includes a housing 1. Inside the housing 1, there are a mixing chamber 2 and a separation chamber 3 separated by a partition 15. A stirring mechanism is provided in the mixing chamber 2, and a filter plate 16 is provided in the separation chamber 3. A spray pipe 6 communicating with the mixing chamber 2 and spraying raw materials onto the filter plate 16 is provided on the partition 15. A discharge port 17 is provided on the filter plate 16. A discharge box 19 is provided in the separation chamber 3 below the discharge port 17. A scraper 18 is rotatably installed in the housing 1 above the filter plate 16 to scrape the solids above the filter plate 16 into the discharge port 17. A filter screen 22 is hinged in the discharge box 19. A discharge port 20 is provided on the housing 1 above the filter screen 22. A cam 25 for driving the filter screen 22 to swing up and down around the hinge axis is rotatably installed in the discharge box 19. A driving mechanism for driving the cam 25 and the scraper 18 to rotate is provided on the housing 1.

[0021] The stirring mechanism includes a stirring shaft and a driving motor 8. The driving motor 8 is fixedly connected to the upper side of the housing 1 through a motor fixing seat. The stirring shaft includes a central shaft 9. At the upper end of the central shaft 9, a plurality of horizontally extending connecting rods 10 are fixedly connected. At the lower side of the end of the connecting rod 10, a stirring rod 11 is fixedly connected. A screw conveyor 12 is provided below the central shaft 9. A sleeve 13 sleeved outside the screw conveyor 12 is provided on the partition 15. The partition 15 is fixedly connected to the sleeve 13 through a fixing rod 14. The partition 15 is a conical plate convex downward at the center. The spray pipe 6 is in an L shape. The upper end of the vertical section of the spray pipe 6 is fixedly connected to the center position of the lower end of the partition 15. A plurality of nozzles are provided on the lower side of the horizontal section of the spray pipe 6. A discharge valve 7 is provided on the vertical section of the spray pipe 6.

[0022] A feed pipe 4 communicating with the mixing chamber 2 is fixedly connected to the upper end of the housing 1. The lower end of the housing 1 is in a conical structure, and a discharge pipe 5 is provided at the center position of the lower end of the housing 1. The lower end of the scraper 18 is fixedly connected with an installation rod 28. A perforation for the installation rod 28 to pass through is provided on the filter plate 16. A mounting plate 27 is fixedly connected to the discharge box 19. The installation rod 28 is installed on the mounting plate 27 through a bearing. The rotating shaft of the cam 25 is rotatably installed in the discharge box 19 through a bearing, and the rotating shaft of the cam 25 extends out of the outside of the discharge box 19.

[0023] The driving mechanism includes a reduction motor 23, a transmission shaft 24, a driving bevel gear 29, a first driven bevel gear 30 and a second driven bevel gear 31. The reduction motor 23 is fixedly connected to the outer wall of the housing 1 through a motor fixing seat. The end of the transmission shaft 24 is rotatably installed in the housing 1 through a bearing. The end of the transmission shaft 24 is fixedly connected to the output shaft of the reduction motor 23 through a coupling. The driving bevel gear 29 is fixedly connected to the end of the transmission shaft 24. The first driven bevel gear 30 is fixedly connected to the end of the rotating shaft of the cam 25. The second driven bevel gear 31 is fixedly connected to the lower end of the mounting rod 28. A collection box 21 communicating with the discharge port 20 is provided on the housing 1. A support plate 26 for horizontally supporting the filter screen 22 is provided on the inner wall of the discharge box 19. A torsion spring for pressing the filter screen 22 against the support plate 26 is provided on the hinge shaft of the filter screen 22.

[0024] When the lithium hexafluorophosphate solid-liquid separation device of the present utility model is in use, the lithium hexafluorophosphate raw material liquid to be solid-liquid separated is added into the mixing chamber 2 through the feed pipe 4. The driving motor 8 drives the stirring shaft to rotate. The stirring rods 11 in the stirring shaft stir the lithium hexafluorophosphate raw material liquid in the mixing chamber 2. The auger 12 in the stirring shaft turns the lithium hexafluorophosphate raw material liquid at the bottom upward, improving the mixing effect of the lithium hexafluorophosphate raw material liquid. The discharge valve 7 opens and closes intermittently. The uniformly mixed lithium hexafluorophosphate raw material liquid intermittently drops onto the filter plate 16 through the spray pipe 6, and the solidified lithium hexafluorophosphate accumulates on the filter plate 16. The reduction motor 23 is started, and the reduction motor 23 drives the scraper 18 to rotate and the filter screen 22 to swing up and down around the hinge shaft. During the rotation of the scraper 18, the solidified lithium hexafluorophosphate on the filter plate 16 is scraped into the discharge box 19. After being filtered again on the filter screen 22, it enters the collection box 21 from the discharge port 20 under the action of gravity, realizing the solid-liquid separation of the lithium hexafluorophosphate raw material liquid. Compared with the prior art, the lithium hexafluorophosphate solid-liquid separation device of the present utility model avoids the blockage of the filter plate 16 caused by the lithium hexafluorophosphate solid, improves the filtering effect of the filter plate 16, and improves the solid-liquid separation effect. The lithium hexafluorophosphate solid-liquid separation device of the present utility model improves the uniformity of the lithium hexafluorophosphate raw material liquid by setting a stirring mechanism, which helps the lithium hexafluorophosphate raw material liquid entering the filter plate 16 to be more uniform and helps to improve the filtering effect of the filter plate 16.

[0025] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A lithium hexafluorophosphate solid-liquid separation device, characterized in that: The invention comprises a shell, wherein the shell has a mixing chamber and a separation chamber separated by a partition, the mixing chamber is provided with a stirring mechanism, the separation chamber is provided with a filter plate, the partition is provided with a spray pipe connected with the mixing chamber and spraying raw materials onto the filter plate, the filter plate is provided with a discharge port, the separation chamber is provided with a discharge box located at the lower side of the discharge port, a scraper located on the upper side of the filter plate and scraping the solid on the upper side of the filter plate into the discharge port is rotatably installed in the shell, a filter screen is hinged in the discharge box, the shell is provided with a discharge port located on the upper side of the filter screen, and a discharge box is rotatably installed in the discharge box. There is a cam that drives the filter to swing up and down around the hinge shaft, and the shell is provided with a driving mechanism that drives the cam and the scraper to rotate. The stirring mechanism includes a stirring shaft and a driving motor, and the driving motor is fixedly connected to the upper side of the shell through a motor fixing seat. The stirring shaft includes a central shaft, and the upper end of the central shaft is fixedly connected to a plurality of horizontally extending connecting rods, and the lower side of the end of the connecting rod is fixedly connected to a stirring rod. An auger is provided on the lower side of the central shaft, and a sleeve is provided on the partition plate, which is mounted on the outside of the auger, and the partition plate is fixedly connected to the sleeve through a fixing rod.

2. The lithium hexafluorophosphate solid-liquid separation device according to claim 1, characterized in that: The partition is a conical plate with a downward protrusion in the center, the spray pipe is L-shaped, the upper end of the vertical section of the spray pipe is fixedly connected to the center position of the lower end of the partition, a plurality of nozzles are arranged on the lower side of the horizontal section of the spray pipe, and a discharge valve is arranged on the vertical section of the spray pipe.

3. The lithium hexafluorophosphate solid-liquid separation device according to claim 1, characterized in that: The upper end of the shell is fixedly connected with a feed pipe communicating with the mixing chamber, the lower end of the shell is in a conical structure, and a discharge pipe is arranged at the center of the lower end of the shell.

4. The lithium hexafluorophosphate solid-liquid separation device according to claim 1, characterized in that: The lower end of the scraper is fixedly connected to a mounting rod, the filter plate is provided with a through hole for the mounting rod to pass through, the discharge box is fixedly connected to a mounting plate, the mounting rod is mounted on the mounting plate through a bearing, the rotating shaft of the cam is rotatably mounted on the discharge box through a bearing, and the rotating shaft of the cam extends outwardly from the outside of the discharge box.

5. The lithium hexafluorophosphate solid-liquid separation device according to claim 4, characterized in that: The driving mechanism includes a reduction motor, a transmission shaft, a driving bevel gear, a first driven bevel gear and a second driven bevel gear. The reduction motor is fixedly connected to the outer wall of the shell through a motor fixing seat, and the end of the transmission shaft is rotatably installed in the shell through a bearing. The end of the transmission shaft is fixedly connected to the output shaft of the reduction motor through a coupling, the driving bevel gear is fixedly connected to the end of the transmission shaft, the first driven bevel gear is fixedly connected to the end of the rotating shaft of the cam, and the second driven bevel gear is fixedly connected to the lower end of the mounting rod.

6. The lithium hexafluorophosphate solid-liquid separation device according to claim 1, characterized in that: The shell is provided with a collecting box connected with the discharge port, the inner wall of the discharge box is provided with a supporting plate for horizontally supporting the filter screen, and the hinge shaft of the filter screen is provided with a torsion spring for pressing the filter screen against the supporting plate.

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