Purification equipment suitable for filtering alkali metal salt

Abstract

The utility model provides purification equipment suitable for filtering alkali metal salt, which comprises a treatment tank, a liquid collection tank and a vacuum pump, a partition plate for dividing the treatment tank into a filter cavity and a filter pressing cavity is arranged in the treatment tank, a filter cartridge is arranged in the filter cavity, a spiral filter pressing cartridge is arranged in the filter pressing cavity, and the upper part of the filter cartridge is connected with a feed pipe; the bottom of the filter cartridge is connected with a discharge pipe, the liquid collecting tank is connected with the filter cavity through a liquid collecting pipe, and the vacuum pump is communicated with the filter cavity. According to the purification equipment suitable for filtering the alkali metal salt, the partition plate is arranged in the treatment tank to divide the treatment tank into the upper filter cavity and the lower filter pressing cavity, and insoluble substances in the filter cartridge filter out filtrate to the maximum extent under the action of the vacuum pump, so that impurities are accumulated in the filter cartridge, and the alkali metal salt is filtered out. Impurities can be fed into the spiral filter pressing cylinder after being accumulated to a certain amount, and the filtrate is further filtered out through spiral pressure, so that the filtrate is conveniently and comprehensively collected, the quality of the filtrate is improved, and meanwhile, the purity of the filtrate is also ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of alkali metal salt purification, and more specifically relates to a purification device suitable for filtering alkali metal salt. Background Art

[0002] In recent years, with the development of new energy technologies, the demand for lithium-ion batteries has also increased. As an important raw material for lithium-ion battery electrolytes, lithium bis(fluorosulfonyl)imide is also widely used. Lithium bis(fluorosulfonyl)imide is an alkali metal salt that has high temperature resistance and excellent low temperature performance. It can effectively reduce the high and low temperature resistance formed on the electrode surface and reduce the capacity loss of lithium-ion batteries during storage, thereby providing high-capacity batteries.

[0003] Existing alkali metal salts are often filtered and purified through a filter during processing, but the existing filter equipment can generally only perform simple filtering and purification. The insoluble matter after filtration contains a large amount of alkali metal salt solution, and the alkali metal salt filtrate cannot be fully collected, resulting in a huge waste of the filtrate. Utility Model Content

[0004] The utility model aims to provide a purification device suitable for filtering alkali metal salts, which can comprehensively collect alkali metal solutions through negative pressure filtration and filter press separation processes, thereby avoiding the waste of raw materials.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a purification equipment suitable for filtering alkali metal salts, including a treatment tank, a liquid collecting tank and a vacuum pump, a partition plate is provided in the treatment tank, the partition plate is used to separate the treatment tank into a filter chamber and a filter press chamber located below the filter chamber, a filter cartridge is provided in the filter chamber, a spiral filter press cartridge is provided in the filter press chamber, the upper part of the filter cartridge is connected to a feed pipe extending to the outside of the treatment tank, the bottom of the filter cartridge is connected to a discharge pipe penetrating the partition plate and connected to the spiral filter press cartridge, the liquid collecting tank is connected to the filter chamber through a liquid collecting pipe, the vacuum pump is connected to the filter chamber, and is used to form a negative pressure environment on the periphery of the filter cartridge to filter the filtrate from the filter cartridge, the main axis of the spiral filter press cartridge extends horizontally to the outside of the treatment tank, and the spiral filter press cartridge is used to receive and filter the insoluble matter in the filter cartridge to separate the filtrate from the insoluble matter.

[0006] In a possible implementation, the vacuum pump is provided with an exhaust pipe extending into the filter cavity, the end of the exhaust pipe is connected to a suction pipe group located in the filter cartridge, and the suction pipe group is arranged adjacent to the inner circumferential wall of the filter cartridge.

[0007] In some embodiments, the suction pipe group includes an exhaust main pipe connected to the end of the exhaust pipe and a plurality of exhaust ring pipes connected to the outer periphery of the exhaust main pipe. The exhaust ring pipes extend along the inner circumferential wall of the filter cavity, and the circumferential wall of the exhaust ring pipes is provided with exhaust holes arranged toward the axial side of the filter cartridge.

[0008] In a possible implementation, the vacuum pump is connected to an air outlet pipe, which passes through the processing tank and the top wall of the filter cartridge, and the lower end of the air outlet pipe is connected to an airflow disturbance pipe located in the filter cartridge.

[0009] In some embodiments, at least two air flow disturbance tubes are distributed at the lower end of the air outlet pipe. The air flow disturbance tubes are spirally arranged and extend downward toward the outer periphery of the filter cartridge to disturb the insoluble matter in the filter cartridge so that the insoluble matter is close to the inner wall of the filter cartridge.

[0010] In a possible implementation, a control valve is provided on the discharge pipe, and the discharge pipe extends obliquely downward toward a side away from the discharge end of the spiral filter press.

[0011] In some embodiments, a plurality of liquid outlet holes are provided at the bottom of the peripheral wall of the spiral filter press cartridge, and a spiral auger is rotatably connected inside the spiral filter press cartridge. The spiral auger has an extension shaft arranged to pass through the side wall of the processing tank, and a rotating drive component is connected to the end of the extension shaft. The rotating drive component is located at one end of the extension shaft close to the discharge pipe.

[0012] In some embodiments, the inner diameter of the discharge end of the spiral filter press gradually decreases, and the distance between two adjacent blades of the spiral auger gradually decreases.

[0013] In a possible implementation, a liquid outlet pipe connected to the liquid collecting tank is further provided on the side wall of the processing tank. The liquid outlet pipe is located below the liquid collecting pipe, and a lifting pump is provided on the liquid outlet pipe.

[0014] In some embodiments, a flow guide seat is respectively provided at the bottom of the filter chamber and the filter press chamber, and the flow guide seat has a flow guide surface which is inclined to guide the solution into the liquid collecting pipe or the liquid outlet pipe.

[0015] Compared with the prior art, the scheme shown in the embodiment of the present application is a scheme in which a partition plate is arranged in the treatment tank to divide the treatment tank into an upper filter chamber and a lower filter press chamber. The insoluble matter in the filter cartridge is filtered out of the filtrate to the maximum extent under the action of the vacuum pump, so that impurities are accumulated inside the filter cartridge. When the impurities accumulate to a certain amount, they can be sent into the spiral filter press cartridge, and the filtrate is further filtered out by the spiral pressure, which is convenient for comprehensive collection of the filtrate, improves the quality of the filtrate, avoids waste of raw materials, and also ensures the purity of the filtrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic diagram of a partial cross-sectional structure of a purification device suitable for filtering alkali metal salts provided in an embodiment of the utility model;

[0018] Figure 2 For the utility model embodiment Figure 1 The partially enlarged structural diagram of middle Ⅰ;

[0019] Figure 3 This is an embodiment of the utility model Figure 1 Schematic diagram of the partially enlarged structure of II.

[0020] Among them, the reference numerals in the figure are:

[0021] 1. Treatment tank; 11. Partition plate; 12. Filter chamber; 13. Filter press chamber; 14. Guide seat; 2. Liquid collecting tank; 21. Liquid collecting pipe; 3. Vacuum pump; 31. Air outlet pipe; 32. Air flow disturbance pipe; 4. Filter cartridge; 41. Feed pipe; 42. Discharge pipe; 43. Control valve; 5. Spiral filter press cartridge; 51. Spiral auger; 52. Rotary drive member; 53. Liquid outlet pipe; 54. Lifting pump; 55. Liquid outlet hole; 6. Suction pipe group; 61. Air extraction pipe; 62. Air extraction main pipe; 63. Air extraction ring pipe; 64. Air extraction hole. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or indirectly on the other element. It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0024] Please also read Figures 1 to 3 Now, the purification equipment suitable for filtering alkali metal salts provided by the utility model is described. A purification device suitable for filtering alkali metal salts comprises a treatment tank 1, a liquid collecting tank 2 and a vacuum pump 3. A partition plate 11 is provided in the treatment tank 1. The partition plate 11 is used to separate the treatment tank 1 into a filter chamber 12 and a filter press chamber 13 located below the filter chamber 12. A filter cartridge 4 is provided in the filter chamber 12. A spiral filter press chamber 5 is provided in the filter press chamber 13. The upper part of the filter cartridge 4 is connected to a feed pipe 41 extending to the outside of the treatment tank 1. The bottom of the filter cartridge 4 is connected to a discharge pipe 42 penetrating the partition plate 11 and connected to the spiral filter press chamber 5. The liquid collecting tank 2 is connected to the filter chamber 12 through a liquid collecting pipe 21. The vacuum pump 3 is connected to the filter chamber 12 and is used to form a negative pressure environment on the periphery of the filter cartridge 4 to filter out the filtrate from the filter cartridge 4. The main axis of the spiral filter press chamber 5 extends horizontally to the outside of the treatment tank 1. The spiral filter press chamber 5 is used to receive and filter the insoluble matter in the filter cartridge 4 to separate the filtrate from the insoluble matter.

[0025] The purification equipment suitable for filtering alkali metal salts provided in this embodiment is compared with the prior art. The purification equipment suitable for filtering alkali metal salts provided in this embodiment divides the treatment tank 1 into an upper filter chamber 12 and a lower filter press chamber 13 by arranging a partition plate 11 in the treatment tank 1. The insoluble matter in the filter cartridge 4 is filtered out of the filtrate to the maximum extent under the action of the vacuum pump 3, so that impurities are accumulated inside the filter cartridge 4. When the impurities accumulate to a certain amount, they can be sent to the spiral filter press cartridge 5. The spiral pressure is used to further filter out the filtrate, which is convenient for comprehensive collection of the filtrate, improves the quality of the filtrate, avoids waste of raw materials, and also ensures the purity of the filtrate.

[0026] In one possible implementation, see Figures 1 to 3The vacuum pump 3 is provided with an exhaust pipe 61 extending into the filter cavity 12 , and the end of the exhaust pipe 61 is connected to a suction pipe group 6 located in the filter cartridge 4 , and the suction pipe group 6 is arranged adjacent to the inner peripheral wall of the filter cartridge 4 .

[0027] In this embodiment, the vacuum pump 3 is connected to the extraction component through the suction pipe 61, and the suction component is used to perform a vacuum operation on the filter chamber 12, so as to form a negative pressure environment in the filter chamber 12, thereby increasing the filtration ratio of the filtrate from the insoluble matter and enhancing the filtration capacity of the filtrate. The suction component is arranged close to the inner peripheral wall of the filter cartridge 4, so that the insoluble matter moves toward the outer peripheral direction of the filter cartridge 4, increasing the filtration area and improving the filtration efficiency.

[0028] For some examples, see Figures 1 to 3 The suction pipe group 6 includes an exhaust main pipe 62 connected to the end of the exhaust pipe 61 and a plurality of exhaust ring pipes 63 connected to the outer periphery of the exhaust main pipe 62. The exhaust ring pipe 63 extends along the inner circumferential wall of the filter cavity 12. The exhaust ring pipe 63 has exhaust holes 64 arranged on the circumferential wall toward the axial side of the filter cartridge 4.

[0029] In this embodiment, the suction pipe group 6 adopts the form of a combination of an exhaust main pipe 62 and an extraction ring pipe. The exhaust holes 64 arranged on the exhaust ring pipe 63 are located on the peripheral wall of the exhaust ring pipe 63 and are arranged close to the axial side of the filter cylinder 4, so as to ensure the uniformity of the negative pressure environment at various locations around the periphery of the filter cylinder 4, help to evenly distribute insoluble matter on the inner peripheral wall of the filter cylinder 4, and enhance the filtering effect on insoluble matter.

[0030] In one possible implementation, see Figures 1 to 3 The vacuum pump 3 is connected with an air outlet pipe 31 , which passes through the processing tank 1 and the top wall of the filter cartridge 4 , and the lower end of the air outlet pipe 31 is connected with an airflow disturbance pipe 32 located in the filter cartridge 4 .

[0031] In this embodiment, the gas sucked by the vacuum pump 3 is sent to the filter cartridge 4 through the outlet pipe 31, and the gas is blown onto the insoluble matter by the air flow disturbance pipe 32, thereby disturbing the insoluble matter in the filter cartridge 4, making the insoluble matter evenly distributed in the filter cartridge 4, thereby enhancing the filtering capacity of the filtrate.

[0032] For some examples, see Figures 1 to 3 At least two air disturbance pipes 32 are arranged at the lower end of the air outlet pipe 31. The air disturbance pipes 32 are arranged in a spiral shape and extend downwardly toward the outer periphery of the filter cartridge 4, and are used to disturb the insoluble matter in the filter cartridge 4 so that the insoluble matter is close to the inner peripheral wall of the filter cartridge 4. The air disturbance pipe adopts a spiral structure, which can make the insoluble matter uniformly distributed in the circumferential direction, and then effectively filter out the filtrate through the peripheral wall of the filter cartridge 4.

[0033] In one possible implementation, see Figures 1 to 3The discharge pipe 42 is provided with a control valve 43, and the discharge pipe 42 extends downward and downward to a side away from the discharge end of the spiral filter press cartridge 5. The control valve 43 is provided on the discharge pipe 42 to control the opening and closing of the discharge pipe 42. During the filtering process of the filter cartridge 4, in order to ensure the negative pressure environment in the filter chamber 12, the control valve 43 is closed.

[0034] For some examples, see Figures 1 to 3 A plurality of liquid outlet holes 55 are provided at the bottom of the peripheral wall of the spiral filter press cartridge 5. A spiral auger 51 is rotatably connected inside the spiral filter press cartridge 5. The spiral auger 51 has an extension shaft that passes through the side wall of the processing tank 1. A rotary drive member 52 is connected to the end of the extension shaft. The rotary drive member 52 is located at one end of the extension shaft close to the discharge pipe 42.

[0035] In this embodiment, the insoluble matter filtered by the filter cartridge 4 accumulates in the filter cartridge 4. When the insoluble matter accumulates to a certain height, the control valve 43 is opened to allow the insoluble matter to enter the spiral filter cartridge 5. The peripheral wall of the spiral filter cartridge 5 is provided with a liquid outlet hole 55. The spiral auger 51 is driven to rotate by a rotating drive member 52 such as a motor, and the spiral auger 51 further drives the insoluble matter to rotate, the insoluble matter is fully squeezed, and the filtrate in the insoluble matter is discharged through the liquid outlet hole 55, so as to achieve further separation of the filtrate, enhance the filtering capacity of the filtrate, and avoid the waste of raw materials.

[0036] For some examples, see Figures 1 to 3 The inner diameter of the discharge end of the spiral filter press 5 gradually decreases, and the distance between two adjacent blades of the spiral auger 51 gradually decreases. The inner diameter of the storage end of the spiral filter press 5 decreases, so that its cross-sectional area becomes smaller, and at the same time, the distance between two adjacent blades decreases, further enhancing the squeezing force on the insoluble matter, making it easier for the filtrate in the insoluble matter to be fully squeezed out and the filtrate collection efficiency is improved.

[0037] In one possible implementation, see Figures 1 to 3 A liquid outlet pipe 53 connected to the liquid collecting tank 2 is also provided on the side wall of the treatment tank 1. The liquid outlet pipe 53 is located below the liquid collecting pipe 21 and a lifting pump 54 is provided on the liquid outlet pipe 53. The filtrate in the treatment tank 1 is discharged through the liquid outlet pipe 53 and sent to the collecting tank for unified collection under the action of the lifting pump 54.

[0038] For some examples, see Figures 1 to 3 The bottom of the filter chamber 12 and the filter press chamber 13 are respectively provided with a guide seat 14, and the guide seat 14 has a guide surface that is inclined to guide the solution to the liquid collecting pipe 21 or the liquid outlet pipe 53. The guide seat 14 has the same cross-sectional area as the filter chamber 12 and the filter press chamber 13, and the filtrate is uniformly guided to the liquid outlet pipe 53 by the guide surface, so as to facilitate the centralized collection of the filtrate.

[0039] The above-mentioned purification equipment suitable for filtering alkali metal salts divides the processing tank 1 into an upper filtering chamber 12 and a lower filter pressing chamber 13 by arranging a partition plate 11 in the processing tank 1. The insoluble matter in the filter cartridge 4 is filtered out of the filtrate to the maximum extent under the action of the vacuum pump 3, so that the impurities are accumulated inside the filter cartridge 4. After the impurities accumulate to a certain amount, they can be sent to the spiral filter press cartridge 5, and the filtrate is further filtered out by the spiral pressure, which is convenient for comprehensive collection of the filtrate, improves the quality of the filtrate, avoids the waste of raw materials, and also ensures the purity of the filtrate.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A purification device suitable for filtering alkali metal salts, characterized in that: The invention comprises a processing tank (1), a liquid collecting tank (2) and a vacuum pump (3); a partition plate (11) is arranged in the processing tank (1); the partition plate (11) is used to separate the processing tank (1) into a filter chamber (12) and a filter press chamber (13) located below the filter chamber (12); a filter cartridge (4) is arranged in the filter chamber (12); a spiral filter cartridge (5) is arranged in the filter press chamber (13); the upper part of the filter cartridge (4) is connected to a feed pipe (41) extending to the outside of the processing tank (1); the bottom of the filter cartridge (4) is connected to a feed pipe (41) penetrating the partition plate; (11) is provided with a discharge pipe (42) connected to the spiral filter cartridge (5), the liquid collecting tank (2) is connected to the filter chamber (12) via the liquid collecting pipe (21), the vacuum pump (3) is connected to the filter chamber (12) and is used to form a negative pressure environment on the periphery of the filter cartridge (4) so ​​that the filtrate can be filtered out of the filter cartridge (4), the main axis of the spiral filter cartridge (5) extends horizontally to the outside of the treatment tank (1), and the spiral filter cartridge (5) is used to receive and filter the insoluble matter in the filter cartridge (4) so ​​that the filtrate can be separated from the insoluble matter.

2. The purification device suitable for filtering alkali metal salts according to claim 1, characterized in that The vacuum pump (3) is provided with an air suction pipe (61) extending into the filter chamber (12); the end of the air suction pipe (61) is connected to a suction pipe group (6) located in the filter cartridge (4); the suction pipe group (6) is arranged adjacent to the inner peripheral wall of the filter cartridge (4).

3. The purification device suitable for filtering alkali metal salts according to claim 2, characterized in that The suction pipe group (6) comprises an exhaust main pipe (62) connected to the end of the exhaust pipe (61) and a plurality of exhaust ring pipes (63) connected to the outer periphery of the exhaust main pipe (62); the exhaust ring pipe (63) extends along the inner peripheral wall of the filter cavity (12); and the peripheral wall of the exhaust ring pipe (63) is provided with an exhaust hole (64) arranged toward the axial side of the filter cylinder (4).

4. The purification device suitable for filtering alkali metal salts according to claim 3, characterized in that The vacuum pump (3) is connected to an air outlet pipe (31), the air outlet pipe (31) passes through the processing tank (1) and the top wall of the filter cartridge (4), and the lower end of the air outlet pipe (31) is connected to an airflow disturbance pipe (32) located in the filter cartridge (4).

5. The purification device suitable for filtering alkali metal salts according to claim 4, characterized in that At least two air flow disturbance pipes (32) are distributed at the lower end of the air outlet pipe (31); the air flow disturbance pipes (32) are arranged in a spiral shape and extend downwardly toward the outer periphery of the filter cartridge (4), and are used to disturb the insoluble matter in the filter cartridge (4) so ​​that the insoluble matter is close to the inner peripheral wall of the filter cartridge (4).

6. A purification device suitable for filtering alkali metal salts according to any one of claims 1 to 5, characterized in that: The discharge pipe (42) is provided with a control valve (43), and the discharge pipe (42) extends obliquely downwardly toward a side away from the discharge end of the spiral filter press (5).

7. The purification device suitable for filtering alkali metal salts according to claim 6, characterized in that A plurality of liquid outlet holes (55) are provided at the bottom of the peripheral wall of the spiral filter press (5), and a spiral auger (51) is rotatably connected inside the spiral filter press (5), and the spiral auger (51) has an extension shaft that passes through the side wall of the processing tank (1), and the end of the extension shaft is connected to a rotating drive member (52), and the rotating drive member (52) is located at one end of the extension shaft close to the discharge pipe (42).

8. The purification device suitable for filtering alkali metal salts according to claim 7, characterized in that The inner diameter of the discharge end of the spiral filter press (5) gradually decreases, and the distance between two adjacent blades of the spiral auger (51) gradually decreases.

9. A purification device suitable for filtering alkali metal salts according to any one of claims 1 to 5, characterized in that: A liquid outlet pipe (53) communicating with the liquid collecting tank (2) is also provided on the side wall of the treatment tank (1); the liquid outlet pipe (53) is located below the liquid collecting pipe (21), and a lifting pump (54) is provided on the liquid outlet pipe (53).

10. The purification device suitable for filtering alkali metal salts according to claim 9, characterized in that A flow guide seat (14) is provided at the bottom of each of the filter chamber (12) and the filter press chamber (13). The flow guide seat (14) has a flow guide surface which is arranged obliquely to guide the solution into the liquid collecting pipe (21) or the liquid outlet pipe (53).

Images