Lithium hexafluorophosphate deacidification and purification device

Abstract

The utility model discloses a lithium hexafluorophosphate deacidification and purification device which comprises a reaction kettle, the liquid adding pipes are mounted at the top of the reaction kettle, the liquid adding pipes comprise the first liquid adding pipe and the second liquid adding pipe, the first liquid adding pipe is used for adding a deacidification agent solution, the second liquid adding pipe is used for adding a lithium hexafluorophosphate saturated solution, one end of the first liquid adding pipe is connected with a first bent pipe, the other end of the second liquid adding pipe is connected with a second bent pipe, and the second bent pipe is connected with a third bent pipe. The first bent pipe and the second bent pipe are connected, a collecting pipe is additionally connected to the joint, and the other end of the collecting pipe is connected with a spiral pipe. According to the utility model, the liquid adding pipe I, the liquid adding pipe II, the bent pipe I, the bent pipe II, the collecting pipe and the spiral pipe are arranged, so that after a deacidification agent solution and a lithium hexafluorophosphate saturated solution are added, the deacidification agent solution and the lithium hexafluorophosphate saturated solution can be fully mixed for a long time, and the bending degree of the spiral pipe also enhances the mixing effect; therefore, the deacidification effect is improved, and the purification efficiency of the lithium hexafluorophosphate saturated solution is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium hexafluorophosphate purification, in particular to a lithium hexafluorophosphate deacidification and purification device. Background Art

[0002] Lithium hexafluorophosphate (LiPF6) is often used as the main component of electrolyte solution in lithium-ion batteries. After production, lithium hexafluorophosphate contains a large amount of acidic hydrogen ions, which increase the acidity of lithium hexafluorophosphate, thus affecting the safety and stability of the battery. Therefore, lithium hexafluorophosphate needs to be deacidified and purified.

[0003] The existing deacidification and purification device cannot ensure that the lithium hexafluorophosphate and the deacidification agent solution are fully mixed when mixing the lithium hexafluorophosphate and the deacidification agent solution, thereby reducing the purification efficiency of the lithium hexafluorophosphate. Utility Model Content

[0004] The utility model aims at solving the problems existing in the prior art and proposes the following technical solutions:

[0005] Lithium hexafluorophosphate deacidification and purification device, comprising:

[0006] Reactor;

[0007] A liquid adding pipe is installed on the top of the reactor, and includes a liquid adding pipe 1 and a liquid adding pipe 2. The liquid adding pipe 1 is used to add a deacidifying agent solution, and the liquid adding pipe 2 is used to add a saturated lithium hexafluorophosphate solution. One end of the liquid adding pipe 1 is connected to an elbow 1, and the other end of the liquid adding pipe 2 is connected to an elbow 2. The elbow 1 and the elbow 2 are connected, and a manifold is additionally connected at the connection, and the other end of the manifold is connected to a spiral tube.

[0008] As a preferred embodiment of the above technical solution, an inclined base is provided at the bottom of the reactor, a stirring mechanism is provided through the center of the inclined base, the stirring mechanism includes a driving member 1 and a stirring shaft, the driving member 1 is rotatably connected to the stirring shaft, the stirring shaft passes through the inclined base and extends into the reactor, a stirring component is provided on the stirring shaft, the stirring component includes a plurality of stirring blades 1, the plurality of stirring blades 1 are evenly arranged on the outer top of the stirring shaft, and an outwardly inclined inclined plate is provided on the top of the stirring blade 1.

[0009] As a preferred embodiment of the above technical solution, the stirring component further includes a plurality of stirring blades 2 and a plurality of stirring blades 3, and the outer periphery of the stirring shaft is provided with a plurality of stirring blades 2 and two groups of a plurality of stirring blades 3 in sequence from top to bottom.

[0010] As a preferred embodiment of the above technical solution, two groups of filter screens are evenly arranged in the reactor, and the filter screens are installed on the inner wall of the reactor through an elastic connecting seat, one group of filter screens is located between stirring blades two and three, and the other group of filter screens is located between the two groups of stirring blades three. An arc plate is provided at the bottom of the filter screen, and a driving rod is provided at the top of one stirring blade three in each group of stirring blades three, and the top of the driving rod is in an inclined state, and the driving rod matches the arc plate.

[0011] As a preferred embodiment of the above technical solution, a connecting pipe is connected to the position of the inclined base on the outer wall of the reactor, and the other end of the connecting pipe is connected to a crystallization mechanism. The crystallization mechanism includes a crystallization box, a liquid inlet is opened on one side of the crystallization box, and a guide seat is provided at the bottom of the inner wall of the crystallization box. The guide seat is in a state of small inclination. A screw and a guide rod are respectively inclined on the crystallization box corresponding to the inclination of the guide seat. One end of the screw is connected to a second driving member, and a scraper is jointly installed on the periphery of the screw and the guide rod. The scraper matches the guide seat, and a discharge door is installed on the inclined end of the guide seat corresponding to the crystallization box.

[0012] The beneficial effects of the utility model are:

[0013] 1. The utility model is provided with a liquid adding pipe 1, a liquid adding pipe 2, a bend pipe 1, a bend pipe 2, a confluence pipe and a spiral pipe. After the deacidification agent solution and the saturated lithium hexafluorophosphate solution are added, the deacidification agent solution and the saturated lithium hexafluorophosphate solution can have more time to be fully mixed, and the curvature of the spiral pipe also enhances the mixing effect, thereby improving the deacidification effect, and further effectively improving the purification efficiency of the saturated lithium hexafluorophosphate solution;

[0014] 2. The utility model is provided with a stirring blade and an inclined plate. When the mixed solution of the deacidifying agent solution and the saturated lithium hexafluorophosphate solution is discharged from the spiral tube, the mixed solution will fall onto the inclined plate. With the rotation of the inclined plate, the falling mixed solution is hit by the inclined plate, which further improves the mixing effect of the mixed solution, thereby improving the deacidification effect.

[0015] 3. The utility model utilizes cooling crystallization to replace the traditional vacuum drying method crystallization, which can effectively avoid the problem of hydrogen fluoride mixed in lithium hexafluorophosphate, thereby improving the purity of lithium hexafluorophosphate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the overall structure of the liquid adding pipe;

[0018] Figure 3 It is a schematic diagram of the stirring mechanism;

[0019] Figure 4 Schematic diagram of the filter structure;

[0020] Figure 5 Schematic diagram of the internal structure of the crystallization mechanism.

[0021] In the figure:

[0022] 1. Reactor; 2. Tilting base; 3. Stirring mechanism; 31. Driving member 1; 32. Stirring shaft; 4. Stirring component; 41. Stirring blade 1; 42. Inclined plate; 43. Stirring blade 2; 44. Stirring blade 3; 441. Driving rod; 5. Filter; 51. Elastic connecting seat; 52. Arc plate; 6. Liquid adding pipe; 61. Liquid adding pipe 1; 62. Liquid adding pipe 2; 63. Bend pipe 1; 64. Bend pipe 2; 65. Manifold; 66. Spiral pipe; 7. Connecting pipe; 8. Crystallization mechanism; 81. Crystallization box; 82. Liquid inlet; 83. Guide seat; 84. Screw; 841. Driving member 2; 85. Guide rod; 86. Scraper; 87. Discharge door. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution of the present utility model will be clearly and completely described below in conjunction with the embodiments.

[0024] Example

[0025] like Figure 1 As shown;

[0026] The lithium hexafluorophosphate deacidification and purification device comprises a reactor 1, a liquid adding pipe 6 is installed on the top of the reactor 1, the liquid adding pipe 6 comprises a liquid adding pipe 1 61 and a liquid adding pipe 2 62, the liquid adding pipe 1 61 is used to add a deacidifying agent solution, the liquid adding pipe 2 62 is used to add a saturated lithium hexafluorophosphate solution, one end of the liquid adding pipe 1 61 is connected to an elbow 1 63, the other end of the liquid adding pipe 2 62 is connected to an elbow 2 64, the elbow 1 63 and the elbow 2 64 are connected, and a manifold 65 is additionally connected at the connection, and the other end of the manifold 65 is connected to A spiral tube 66 is connected, so that when the deacidifying agent solution and the saturated lithium hexafluorophosphate solution are added, the deacidifying agent solution and the saturated lithium hexafluorophosphate solution enter the confluence pipe 65 through the liquid adding pipe 1 61 and the bend pipe 1 63 and the liquid adding pipe 2 62 and the bend pipe 2 64 respectively, and are merged together, and then further mixed through the spiral tube 66, which increases the mixing time of the two. The curvature of the spiral tube 66 also enhances the mixing effect, thereby improving the deacidifying effect, and then effectively improving the purification efficiency of the saturated lithium hexafluorophosphate solution.

[0027] like Figure 1-4 As shown;

[0028] An inclined base 2 is provided at the bottom of the reactor 1, and a stirring mechanism 3 is provided at the center of the inclined base 2. The stirring mechanism 3 includes a driving member 31 and a stirring shaft 32. The driving member 31 can be a motor. The driving member 31 and the stirring shaft 32 are rotatably connected. The stirring shaft 32 penetrates the inclined base 2 and extends into the reactor 1. A stirring component 4 is provided on the stirring shaft 32. The stirring component 4 includes a plurality of stirring blades 41. The plurality of stirring blades 41 are evenly arranged on the top of the outer periphery of the stirring shaft 32. An outwardly inclined inclined plate 42 is provided on the top of the stirring blade 41. When the mixed liquid after the deacidifying agent solution and the saturated lithium hexafluorophosphate solution are mixed is discharged from the spiral tube 66, the mixed liquid will fall onto the inclined plate 42. With the rotation of the inclined plate 42, the falling mixed liquid is hit by the inclined plate 42, which further improves the mixing effect of the mixed liquid, thereby improving the deacidification effect.

[0029] Furthermore, the stirring member 4 further includes a plurality of stirring blades 43 and a plurality of stirring blades 44. The outer periphery of the stirring shaft 32 is provided with a plurality of stirring blades 43 and two groups of stirring blades 44 in order from top to bottom. The plurality of stirring blades 41, the stirring blades 43, and the stirring blades 44 stir the mixed solution to improve the deacidification efficiency of the saturated lithium hexafluorophosphate solution.

[0030] Furthermore, two groups of filter screens 5 are evenly arranged in the reactor 1, and the filter screens 5 are used to filter the lithium hexafluorophosphate mixed solution, so that the lithium hexafluorophosphate mixed solution passing through the filter screens 5 is purer. The two groups of filter screens 5 are arranged to further improve the purity of the lithium hexafluorophosphate mixed solution. The filter screens 5 are installed on the inner wall of the reactor 1 through an elastic connection seat 51, and a plurality of springs are arranged in the elastic connection seat 51; one group of filter screens 5 is located between the second stirring blade 43 and the third stirring blade 44, and the other group of filter screens 5 is located between the two groups of stirring blades 44. An arc plate 52 is provided at the bottom of the filter 5, and a driving rod 441 is provided at the top of one of the stirring blades 44 in each group of stirring blades 44. The top of the driving rod 441 is in an inclined state, and the driving rod 441 matches the arc plate 52. When the corresponding stirring blade 44 rotates, it will drive the driving rod 441 to move in a circle. When the driving member 411 contacts the arc plate 52, the driving member 411 will cause the arc plate 52 to deflect upward, thereby causing the filter 5 to deflect upward, and this reciprocating process causes the filter 5 to shake up and down, thereby effectively avoiding its clogging.

[0031] like Figure 1 and Figure 5 As shown;

[0032] A connecting pipe 7 is connected through the position of the outer wall of the reactor 1 corresponding to the inclined base 2, and the other end of the connecting pipe 7 is connected to a crystallization mechanism 8, which includes a crystallization box 81. The crystallization box 81 is connected to an external cooling mechanism, such as a freezing liquid circulation pipe, so that the crystallization box 81 is always kept at a low temperature, which is convenient for the lithium hexafluorophosphate solution to enter and crystallize. A liquid inlet 82 is opened on one side of the crystallization box 81, and a guide seat 83 is provided at the bottom of the inner wall of the crystallization box 81. The lithium hexafluorophosphate solution flows to the surface of the guide seat 83 through the liquid inlet 82. The guide seat 83 is in a state of a small inclination, so that the lithium hexafluorophosphate solution will slowly slide down and slowly crystallize in the process of sliding down. , which improves the crystallization efficiency. A screw 84 and a guide rod 85 are respectively inclined on the crystallization box 81 corresponding to the inclination of the guide seat 83. One end of the screw 84 is connected to the second driving member 841, which can be a motor. A scraper 86 is installed on the periphery of the screw 84 and the guide rod 85. The scraper 86 matches the guide seat 83. A discharge gate 87 is installed on the crystallization box 81 corresponding to the inclined end of the guide seat 83. By starting the second driving member 841 to make the screw 84 rotate forward and reverse, the scraper 86 is moved back and forth on the guide seat 83, thereby scraping off the lithium hexafluorophosphate crystals crystallized on the surface of the guide seat 83, and finally discharged through the opening and closing of the discharge gate 87.

[0033] The above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it.

Claims

1. A lithium hexafluorophosphate deacidification and purification device, characterized in that: include: Reactor (1); A liquid adding pipe (6), the liquid adding pipe (6) being installed on the top of the reaction kettle (1), the liquid adding pipe (6) comprising a first liquid adding pipe (61) and a second liquid adding pipe (62), the first liquid adding pipe (61) being used for adding a deacidifying agent solution, the second liquid adding pipe (62) being used for adding a saturated lithium hexafluorophosphate solution, one end of the first liquid adding pipe (61) being connected to a first curved pipe (63), the other end of the second liquid adding pipe (62) being connected to a second curved pipe (64), the first curved pipe (63) and the second curved pipe (64) being connected, and a manifold (65) being connected at the connection, the other end of the manifold (65) being connected to a spiral pipe (66).

2. The lithium hexafluorophosphate deacidification and purification device according to claim 1, characterized in that: The bottom of the reactor (1) is provided with an inclined base (2), and a stirring mechanism (3) is provided at the center of the inclined base (2). The stirring mechanism (3) comprises a driving member (31) and a stirring shaft (32). The driving member (31) and the stirring shaft (32) are rotatably connected. The stirring shaft (32) passes through the inclined base (2) and extends into the reactor (1). A stirring component (4) is provided on the stirring shaft (32). The stirring component (4) comprises a plurality of stirring blades (41). The plurality of stirring blades (41) are evenly arranged at the top of the outer periphery of the stirring shaft (32), and an outwardly inclined inclined plate (42) is provided at the top of the stirring blade (41).

3. The lithium hexafluorophosphate deacidification and purification device according to claim 2, characterized in that: The stirring component (4) further comprises a plurality of stirring blades (43) and a plurality of stirring blades (44). The outer periphery of the stirring shaft (32) is provided with a plurality of stirring blades (43) and two groups of stirring blades (44) in sequence from top to bottom.

4. The lithium hexafluorophosphate deacidification and purification device according to claim 3, characterized in that: Two groups of filter screens (5) are evenly arranged in the reactor (1). The filter screens (5) are mounted on the inner wall of the reactor (1) via an elastic connection seat (51). One group of filter screens (5) is located between the second stirring blade (43) and the third stirring blade (44), and the other group of filter screens (5) is located between the two groups of third stirring blades (44). An arc plate (52) is arranged at the bottom of the filter screens (5). A driving rod (441) is arranged at the top of one of the third stirring blades (44) in each group of third stirring blades (44). The top of the driving rod (441) is in an inclined state, and the driving rod (441) matches the arc plate (52).

5. The lithium hexafluorophosphate deacidification and purification device according to claim 1, characterized in that: A connecting pipe (7) is connected through the outer wall of the reaction kettle (1) at a position corresponding to the inclined base (2); the other end of the connecting pipe (7) is connected to a crystallization mechanism (8); the crystallization mechanism (8) comprises a crystallization box (81); a liquid inlet (82) is provided on one side of the crystallization box (81); a guide seat (83) is provided at the bottom of the inner wall of the crystallization box (81); a screw rod (84) and a guide rod (85) are provided on the crystallization box (81) at an angle corresponding to the inclination of the guide seat (83); one end of the screw rod (84) is connected to a second driving member (841); a scraper (86) is installed on the outer periphery of the screw rod (84) and the guide rod (85); the scraper (86) matches the guide seat (83); and a discharge door (87) is installed on the inclined end of the guide seat (83) corresponding to the crystallization box (81).

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