Dry-type direct-cooling superconducting magnetic separation equipment for impurity removal of carbon nanotube conductive slurry

Abstract

The utility model discloses dry-type direct-cooling superconducting magnetic separation equipment for removing impurities from carbon nanotube conductive paste, which relates to the technical field of carbon nanotube conductive paste impurity removal and comprises a superconducting magnet, and a refrigerator is mounted on the outer surface of the superconducting magnet. The superconducting magnet coil is cooled by adopting a refrigerator direct cooling technology, the superconducting state does not need to be maintained depending on liquid helium, the refrigeration energy consumption is reduced by more than 50%, the superconducting magnet almost has zero resistance during steady-state operation, only a small amount of electric energy for maintaining low temperature is needed, the comprehensive energy consumption of equipment is reduced, the magnetic field intensity of the superconducting magnet is larger than or equal to 4.5 T, and the cost is low. A high-gradient magnetic field design is combined, and the particle size gt can be captured; the occupied area of the device is less than or equal to 5m < 2 >, vehicle-mounted mobile deployment can be supported, the device is suitable for high-cleanliness workshops with limited space, the risk of liquid helium volatilization is avoided, and the service life gt of the superconducting magnet is prolonged; and continuous operation can be supported in 10 years.

Description

Technical Field

[0001] This utility model relates to the field of impurity removal technology for carbon nanotube conductive slurry, specifically a dry direct-cooling superconducting magnetic separation device for impurity removal of carbon nanotube conductive slurry. Background Technology

[0002] Current impurity removal processes for carbon nanotube conductive slurries mainly employ physical filtration, permanent magnet rod impurity removal, and conventional electromagnetic separation technology.

[0003] Among them: physical filtration technology uses multi-stage sieves to intercept impurities and is suitable for removing millimeter-level particles; permanent magnet rod impurity removal technology uses permanent magnets such as neodymium iron boron to generate a static magnetic field of 0.8-1.2T, which captures ferromagnetic impurities (such as iron tetroxide, metal shavings, etc.) through direct adsorption. The equipment has a simple structure and does not require external power supply; conventional electromagnetic separation technology uses excitation coils to generate a dynamic magnetic field of ≤1.5T, which can periodically remove adsorbed impurities.

[0004] Among the three methods for removing impurities from carbon nanotube conductive slurries mentioned above, physical filtration technology carries the risk of filter clogging and cannot handle micron-sized non-magnetic impurities; permanent magnet rod impurity removal technology has a capture efficiency of less than 15% for paramagnetic materials (such as chromium trioxide and titanium dioxide) and suffers from magnetic field shielding effects caused by impurity accumulation on the rod surface; conventional electromagnetic separation technology still cannot meet the needs of high-end users in the new energy battery industry for separating micron-sized (<100μm) weakly magnetic impurities. Therefore, we provide a dry direct-cooling superconducting magnetic separation device for removing impurities from carbon nanotube conductive slurries to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a dry direct-cooling superconducting magnetic separation device for removing impurities from carbon nanotube conductive slurry.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a dry direct-cooling superconducting magnetic separation device for removing impurities from carbon nanotube conductive slurry, comprising a superconducting magnet, a refrigerator mounted on the outer surface of the superconducting magnet, the cold end of the refrigerator being in contact with the coil of the superconducting magnet, an impurity removal component for removing impurities from carbon nanotube conductive slurry being provided inside the superconducting magnet, and a hydraulic flushing component and an air sweeping component for cleaning the impurity removal component being provided outside the superconducting magnet.

[0007] Furthermore, the impurity removal component includes a central pipe fixed to the inner wall of the superconducting magnet, and a first connecting pipe and a second connecting pipe connected to the corresponding position of the central pipe. The inner wall of the central pipe is fixedly connected to a composite screen assembly for filtering carbon nanotube conductive slurry. The two ports of the second connecting pipe away from the central pipe are respectively connected to a third connecting pipe and a fourth connecting pipe, and the outer surfaces of the third connecting pipe and the fourth connecting pipe are respectively equipped with a first valve and a second valve. The end of the fourth connecting pipe away from the second connecting pipe is equipped with a first pneumatic diaphragm pump for conveying carbon nanotube conductive slurry. The end of the first connecting pipe away from the central pipe is connected to a fifth connecting pipe, and the outer surface of the fifth connecting pipe is equipped with a third valve. Through the coordinated arrangement of the above structures, magnetic and weakly magnetic impurities in the carbon nanotube conductive slurry can be filtered and captured, and the impurity removal rate is ≥95%.

[0008] Furthermore, the hydraulic flushing assembly includes a sixth connecting pipe connected to the central pipe, and an ultrasonic cleaning rod inserted into the central pipe. The end of the sixth connecting pipe away from the central pipe is connected to a seventh connecting pipe, and a fourth valve is installed on the outer surface of the seventh connecting pipe. A second pneumatic diaphragm pump for conveying flushing water is installed at the end of the fourth valve away from the seventh connecting pipe. Through the coordinated arrangement of the above structures, magnetic and weakly magnetic impurities captured on the composite screen assembly can be vibrated and flushed down.

[0009] Furthermore, the air sweeping assembly includes an eighth connecting pipe connected to the central pipe, and a fifth valve is installed on the outer surface of the eighth connecting pipe. A pneumatic triplet connected to an external air source is installed at the end of the eighth connecting pipe away from the central pipe. Through the coordinated arrangement of the above structures, high-velocity compressed air can be used to blow down the magnetic and weakly magnetic impurities captured on the composite screen assembly.

[0010] Furthermore, the composite screen assembly is composed of multiple sets of honeycomb perforated plates, diamond screens, corrugated screens and Teflon separators, which can distort the magnetic field generated by the superconducting magnet, causing different magnetic field strengths and magnetic field gradients to be generated on its surface, thereby achieving the capture of magnetic and weakly magnetic impurities with a particle size >1μm.

[0011] Compared with existing technologies, this dry direct-cooling superconducting magnetic separation equipment for removing impurities from carbon nanotube conductive slurry has the following advantages:

[0012] 1. This invention employs direct cooling technology using a cryostat to cool the superconducting magnet coil, eliminating the need to rely on liquid helium to maintain the superconducting state. This reduces cooling energy consumption by over 50%. Compared to electromagnetic separation, the superconducting magnet exhibits almost zero resistance during steady-state operation, requiring only a small amount of electrical energy to maintain the low temperature, resulting in an overall energy consumption reduction of 80%. Furthermore, the superconducting magnet's magnetic field strength is ≥4.5T. Combined with a high-gradient magnetic field design, it can capture magnetic and weakly magnetic impurities with a particle size >1μm, achieving an impurity removal rate ≥95%. Simultaneously, the equipment occupies an area of ​​≤5m². 2 It supports vehicle-mounted mobile deployment, is suitable for space-constrained cleanrooms, and has no risk of liquid helium volatilization, resulting in a superconducting magnet lifespan of >10 years and the ability to support continuous operation.

[0013] 2. The composite screen assembly of this utility model is composed of multiple sets of honeycomb perforated plates, diamond screens, corrugated screens and Teflon partitions. It can distort the magnetic field generated by the superconducting magnet, so that different magnetic field strengths and magnetic field gradients are generated on its surface, thereby achieving the capture of magnetic and weakly magnetic impurities with a particle size >1μm. Attached Figure Description

[0014] Figure 1 This is a front view of the three-dimensional structure of this utility model;

[0015] Figure 2 This is a right-side view of the three-dimensional structure of this utility model;

[0016] Figure 3 This is a front sectional view of the three-dimensional structure of this utility model;

[0017] Figure 4 This is a partial structural diagram of the present invention;

[0018] Figure 5 This is a schematic diagram showing the structural connection of the composite screen assembly and the ultrasonic cleaning rod of this utility model.

[0019] In the diagram: 1. Superconducting magnet; 2. Refrigeration unit; 301. Central pipe; 302. Composite screen assembly; 303. First connecting pipe; 304. Second connecting pipe; 305. Third connecting pipe; 306. Fourth connecting pipe; 307. First valve; 308. Second valve; 309. First pneumatic diaphragm pump; 3010. Fifth connecting pipe; 3011. Third valve; 401. Sixth connecting pipe; 402. Seventh connecting pipe; 403. Fourth valve; 404. Second pneumatic diaphragm pump; 405. Ultrasonic cleaning rod; 501. Eighth connecting pipe; 502. Fifth valve; 503. Pneumatic triplet. Detailed Implementation

[0020] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0021] As described in the background section, physical filtration technology carries the risk of filter clogging and cannot handle micron-sized non-magnetic impurities; permanent magnet rod impurity removal technology has a capture efficiency of less than 15% for paramagnetic materials such as chromium trioxide and titanium dioxide, and there is a magnetic field shielding effect caused by impurity accumulation on the surface of the magnetic rod; conventional electromagnetic separation technology still cannot meet the needs of high-end users in the new energy battery industry for separating micron-sized (<100μm) weakly magnetic impurities. Therefore, this embodiment provides a dry direct-cooling superconducting magnetic separation device for impurity removal of carbon nanotube conductive slurry.

[0022] See Figures 1 to 5 This embodiment proposes a dry direct-cooling superconducting magnetic separation device for removing impurities from carbon nanotube conductive slurry, including a superconducting magnet 1. A refrigerator 2 is installed on the outer surface of the superconducting magnet 1, and the cold end of the refrigerator 2 is in contact with the coil of the superconducting magnet 1. When the refrigerator 2 is powered on and started, it can perform dry direct cooling on the coil of the superconducting magnet 1 without relying on liquid helium to maintain the superconducting state of the superconducting magnet 1, thereby reducing the cooling energy consumption by more than 50%.

[0023] The superconducting magnet 1 is internally equipped with a purification component for removing impurities from the carbon nanotube conductive slurry. The purification component includes a central pipe 301 fixed to the inner wall of the superconducting magnet 1, and a first connecting pipe 303 and a second connecting pipe 304 connected to the central pipe 301 at corresponding positions. A composite screen group 302 for filtering the carbon nanotube conductive slurry is fixedly connected to the inner wall of the central pipe 301. The two ports of the second connecting pipe 304 away from the central pipe 301 are respectively connected to a third connecting pipe 305 and a fourth connecting pipe 306, and a first valve 307 and a second valve 308 are respectively installed on the outer surfaces of the third connecting pipe 305 and the fourth connecting pipe 306.

[0024] The composite screen assembly 302 is composed of multiple sets of honeycomb perforated plates, rhomboid screens, corrugated screens and Teflon partitions. It can distort the magnetic field generated by the superconducting magnet 1, so that different magnetic field strengths and magnetic field gradients are generated on its surface, thereby achieving the adsorption and capture of magnetic impurity particles of different sizes with a particle size >1μm and magnetic and weak magnetic impurities.

[0025] The fourth connecting pipe 306 is equipped with a first pneumatic diaphragm pump 309 for conveying carbon nanotube conductive slurry at one end away from the second connecting pipe 304. The first connecting pipe 303 is connected to a fifth connecting pipe 3010 at one end away from the central pipe 301, and a third valve 3011 is installed on the outer surface of the fifth connecting pipe 3010.

[0026] The input end of the first pneumatic diaphragm pump 309 is connected to a storage tank for storing carbon nanotube conductive slurry. When removing impurities from the carbon nanotube conductive slurry, the second valve 308 and the third valve 3011 can be opened, and the first valve 307 can be closed. Then, the first pneumatic diaphragm pump 309 is powered on and started, which can generate suction to draw the carbon nanotube conductive slurry. The carbon nanotube conductive slurry then passes through the second valve 308, the second connecting pipe 304, the central pipe 301, the first connecting pipe 303, and the fifth connecting pipe 3010 in sequence. The composite screen group 302 can be used to filter and capture magnetic and weakly magnetic impurities in the carbon nanotube conductive slurry.

[0027] The superconducting magnet 1 is externally equipped with a hydraulic rinsing assembly and an air sweeping assembly for cleaning the impurity removal components. The hydraulic rinsing assembly includes a sixth connecting pipe 401 connected to the central pipe 301, and an ultrasonic cleaning rod 405 inserted inside the central pipe 301. The end of the sixth connecting pipe 401 away from the central pipe 301 is connected to a seventh connecting pipe 402, and a fourth valve 403 is installed on the outer surface of the seventh connecting pipe 402. The end of the fourth valve 403 away from the seventh connecting pipe 402 is equipped with a second pneumatic diaphragm pump 404 for conveying rinsing water.

[0028] The input end of the second pneumatic diaphragm pump 404 is connected to a water storage tank for storing rinsing water. When it is necessary to clean the impurities captured on the composite screen group 302, the second valve 308 and the third valve 3011 can be closed, and the first valve 307 and the fourth valve 403 can be opened. Then, the second pneumatic diaphragm pump 404 and the ultrasonic cleaning rod 405 are powered on and started, which can generate suction to draw the rinsing water. The rinsing water passes through the seventh connecting pipe 402, the sixth connecting pipe 401, the central pipe 301 and the second connecting pipe 304 in sequence, and finally flows out from the third connecting pipe 305.

[0029] At the same time, after the ultrasonic cleaning rod 405 is started, it can generate vibration, which, together with clean water, will vibrate and wash down the magnetic and weakly magnetic impurities captured on the composite screen group 302. The composite screen group 302 can be opened with a hole larger than the ultrasonic cleaning rod 405, so as not to block the normal vibration of the ultrasonic cleaning rod 405.

[0030] The air sweeping assembly includes an eighth connecting pipe 501 connected to the central pipe 301, and a fifth valve 502 is installed on the outer surface of the eighth connecting pipe 501. A pneumatic triplet 503 connected to an external air source is installed at the end of the eighth connecting pipe 501 away from the central pipe 301. The pneumatic triplet 503 is composed of three air source processing elements: an air filter, a pressure reducing valve, and an oil mist lubricator.

[0031] Pressure reducing valves can stabilize the air source pressure, keeping it at a constant level and reducing damage to valves or actuators caused by sudden changes in air source pressure. Filters are used to clean the air source, filtering out moisture from compressed air to prevent moisture from entering the device. Oil mist lubricators can lubricate moving parts of the machine body, providing lubrication for parts where it is inconvenient to apply lubricating oil, thus greatly extending the service life of the machine body.

[0032] The valve of this utility model can be a pneumatic ball valve.

[0033] The components in the accompanying drawings of this utility model are for styling reference only and are not specific dimensional standards. The specific dimensions are determined according to the actual production requirements, and the materials of each component can be replaced accordingly based on actual needs.

[0034] All electrical components in this invention are commercially available, conventional equipment known to those skilled in the art. Models can be selected or customized according to actual needs. The setting method, installation method, and electrical connection method can be easily understood by those skilled in the art by following the instructions for use, and will not be described in detail here.

[0035] Each electrical component in this invention is equipped with a corresponding control switch. The specific installation location of the control switch can be selected according to actual usage requirements to facilitate operation and control by the operator.

[0036] Working principle: When using this dry direct-cooling superconducting magnetic separation equipment to remove impurities from carbon nanotube conductive slurry, the superconducting magnet 1 and the refrigerator 2 can be connected to the power supply and started. After the superconducting magnet 1 is started, it can generate a magnetic field with a magnetic field strength ≥4.5T. At the same time, the composite screen group 302, which is composed of multiple sets of honeycomb perforated plates, rhomboid screens, corrugated screens and Teflon separators, can distort the magnetic field generated by the superconducting magnet 1, so that different magnetic field strengths and magnetic field gradients are generated on its surface. Since the pore size of each filter in the composite screen group 302 is different, it can capture magnetic and weak magnetic impurities of different sizes. At the same time, after the refrigerator 2 is started, it can dry direct-cool the coil of the superconducting magnet 1, so that it does not need to rely on liquid helium to maintain the superconducting state of the superconducting magnet 1, thus reducing the cooling energy consumption by more than 50%.

[0037] When it is necessary to remove impurities from the carbon nanotube conductive slurry, the second valve 308 and the third valve 3011 can be opened and the first valve 307 can be closed. Then, the first pneumatic diaphragm pump 309 is powered on and started, which can generate suction to draw the carbon nanotube conductive slurry. The carbon nanotube conductive slurry then passes through the second valve 308, the second connecting pipe 304, the central pipe 301, the first connecting pipe 303 and the fifth connecting pipe 3010 in sequence. The composite screen group 302 can be used to filter and capture magnetic and weakly magnetic impurities in the carbon nanotube conductive slurry.

[0038] When it is necessary to clean the impurities captured on the composite screen assembly 302, the superconducting magnet 1 can be stopped to demagnetize it. Then, the second valve 308 and the third valve 3011 are closed, and the first valve 307 and the fourth valve 403 are opened. Then, the second pneumatic diaphragm pump 404 and the ultrasonic cleaning rod 405 are powered on and started, which can generate suction to draw the rinsing water. The rinsing water passes through the seventh connecting pipe 402, the sixth connecting pipe 401, the central pipe 301 and the second connecting pipe 304 in sequence, and finally flows out from the third connecting pipe 305. After the ultrasonic cleaning rod 405 is started, it can generate vibration, which, together with the clean water, vibrates and washes down the magnetic and weakly magnetic impurities captured on the composite screen assembly 302.

[0039] Then, the second pneumatic diaphragm pump 404 and ultrasonic cleaning rod 405 are stopped. Then, the fifth valve 502, pneumatic triplet 503 and external power supply are turned on, which can generate high-velocity compressed air and pass through the pneumatic triplet 503 and the fifth valve 502 in sequence until it is blown into the central pipe 301. This blows down some of the magnetic particles and residual moisture captured on the composite screen group 302, and finally discharges the magnetic particles outward through the second connecting pipe 304 and the third connecting pipe 305.

Claims

1. A dry direct-cooling superconducting magnetic separation device for removing impurities from carbon nanotube conductive slurry, comprising a superconducting magnet (1), characterized in that: A refrigerator (2) is installed on the outer surface of the superconducting magnet (1), and the cold end of the refrigerator (2) is in contact with the coil of the superconducting magnet (1). The superconducting magnet (1) is equipped with a cleaning component for removing impurities from carbon nanotube conductive slurry. The superconducting magnet (1) is equipped with a water flushing component and an air sweeping component for cleaning the cleaning component.

2. The dry direct-cooling superconducting magnetic separation device for removing impurities from carbon nanotube conductive slurry according to claim 1, characterized in that: The impurity removal assembly includes a central pipe (301) fixed to the inner wall of the superconducting magnet (1), and a first connecting pipe (303) and a second connecting pipe (304) connected to the central pipe (301) at corresponding positions. A composite screen assembly (302) for filtering carbon nanotube conductive slurry is fixedly connected to the inner wall of the central pipe (301). Two ports of the second connecting pipe (304) away from the central pipe (301) are respectively connected to a third connecting pipe (305) and a fourth connecting pipe (306). The outer surfaces of the third connecting pipe (305) and the fourth connecting pipe (306) are respectively equipped with a first valve (307) and a second valve (308). The fourth connecting pipe (306) is equipped with a first pneumatic diaphragm pump (309) for conveying carbon nanotube conductive slurry at one end away from the second connecting pipe (304). The first connecting pipe (303) is connected to a fifth connecting pipe (3010) at one end away from the central pipe (301), and a third valve (3011) is installed on the outer surface of the fifth connecting pipe (3010).

3. The dry direct-cooling superconducting magnetic separation device for removing impurities from carbon nanotube conductive slurry according to claim 2, characterized in that: The hydraulic flushing assembly includes a sixth connecting pipe (401) connected to the central pipe (301) and an ultrasonic cleaning rod (405) inserted inside the central pipe (301). The end of the sixth connecting pipe (401) away from the central pipe (301) is connected to a seventh connecting pipe (402), and a fourth valve (403) is installed on the outer surface of the seventh connecting pipe (402). The end of the fourth valve (403) away from the seventh connecting pipe (402) is equipped with a second pneumatic diaphragm pump (404) for conveying flushing water.

4. The dry direct-cooling superconducting magnetic separation device for removing impurities from carbon nanotube conductive slurry according to claim 2, characterized in that: The air sweeping assembly includes an eighth connecting pipe (501) connected to the central pipe (301), and a fifth valve (502) is installed on the outer surface of the eighth connecting pipe (501). A pneumatic triplet (503) connected to an external air source is installed at the end of the eighth connecting pipe (501) away from the central pipe (301).

5. A dry direct-cooling superconducting magnetic separation device for removing impurities from carbon nanotube conductive slurry according to claim 2, characterized in that: The composite screen assembly (302) is composed of multiple sets of honeycomb perforated plates, diamond screens, corrugated screens and Teflon partitions.

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