A high-temperature purification treatment device for carbon nanotube slurry

Abstract

This application discloses a high-temperature purification treatment device for carbon nanotube slurry, including a furnace body with a detachably connected top cover and bottom cover, and further including a dispersion component and an aeration component. The dispersion component includes multiple stirring paddles evenly distributed along the circumference of the bottom cover. A cylinder is fixedly mounted on the top cover, and the cylinder drives an aeration disc located at the center of the furnace body between the multiple stirring paddles. Multiple layers of annular gas distribution pipes are axially arranged on the inner wall of the furnace body. This application ensures that every area of ​​the slurry can be contacted with sufficient and uniform reactive gases.

Description

Technical Field

[0001] This utility model relates to the field of carbon nanotube processing technology, specifically to a high-temperature purification treatment device for carbon nanotube slurry. Background Technology

[0002] Carbon nanotubes, also known as buckytubes, are one-dimensional quantum materials with a unique structure (radial dimensions on the nanometer scale, axial dimensions on the micrometer scale, and both ends of the tube are essentially sealed). Carbon nanotubes are primarily composed of several to dozens of layers of coaxial cylindrical tubes arranged in a hexagonal pattern. As a one-dimensional nanomaterial, carbon nanotubes are lightweight, have a perfectly connected hexagonal structure, and possess many exceptional mechanical, electrical, and chemical properties. In recent years, with the deepening research on carbon nanotubes and nanomaterials, their broad application prospects have been continuously revealed, leading to their widespread use in lithium batteries and conductive materials. They belong to the optoelectronic and microelectronic materials category of advanced electronic materials.

[0003] Currently, chemical vapor deposition (CVD) is a common method for preparing carbon nanotubes. However, the carbon nanotube slurries prepared by this method often contain a large number of impurities, mainly including metal catalyst particles (such as Fe, Co, Ni, etc.), amorphous carbon, and residual hydrocarbons. The presence of these impurities seriously affects the performance of carbon nanotubes. For example, metal catalyst impurities can reduce the electrical stability of carbon nanotubes, leading to abnormal current transmission in electronic device applications; the presence of amorphous carbon can weaken the reinforcing effect of carbon nanotubes in composite materials, reducing the overall mechanical properties of the materials. Therefore, efficient purification of carbon nanotube slurries is a key step in realizing their widespread application.

[0004] Currently, high-temperature purification is one of the important methods for removing impurities from carbon nanotube slurries. High temperatures can enhance the chemical reaction rate, improve the efficiency of impurity removal, and promote the escape of volatile impurities. In addition, the introduction of reaction gases plays a key role in selectively removing specific impurities during the high-temperature purification process. For example, introducing inert gases creates an inert atmosphere to prevent carbon nanotubes from being over-oxidized at high temperatures.

[0005] However, existing equipment suffers from a significant problem of uneven contact between the reacting gas and the slurry: traditional equipment often uses a single nozzle or fixed pipe for gas distribution, which easily creates localized turbulence after the gas is ejected, resulting in significant differences in gas concentration distribution within the furnace. Simultaneously, the carbon nanotube slurry tends to agglomerate during the static placement process within the furnace, forming a dense accumulation layer. Gas struggles to penetrate this layer, causing insufficient contact between the surface slurry and gas, leading to impurity residue in the internal slurry. This uneven contact directly results in low purification efficiency. Utility Model Content

[0006] The present invention aims to provide a high-temperature purification treatment device for carbon nanotube slurry to solve the problem of uneven contact between reaction gas and slurry in the prior art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A high-temperature purification device for carbon nanotube slurry includes a furnace body, wherein a top cover and a bottom cover are detachably connected to the furnace body.

[0009] It also includes a dispersion component and an aeration component; the dispersion component includes multiple stirring paddles evenly distributed along the circumference of the bottom cover, the top cover is fixedly equipped with a cylinder, the cylinder drives an aeration disc located at the center of the furnace body and between the multiple stirring paddles, and the inner wall of the furnace body is axially arranged with multiple layers of annular air distribution pipes.

[0010] The working principle and beneficial effects of this utility model:

[0011] The furnace body features a removable top and bottom cover for convenient loading and unloading of the slurry. In the dispersion assembly, multiple agitators evenly distributed around the circumference of the bottom cover radially shear the slurry, generating radial shear force on the stationary slurry, tearing apart surface and central agglomerates, and preventing the formation of a dense annular accumulation zone. Simultaneously, a cylinder fixed to the top cover drives an aeration disc located at the center of the furnace body to reciprocate up and down. When the aeration disc descends, it generates axial thrust on the slurry in the central area, forcing the slurry to diffuse outwards, creating a combined squeezing and shearing effect with the radial shearing of the agitators, breaking the traditional dispersion blind zone in the central area. When the aeration disc ascends, a negative pressure is created at its bottom, causing the bottom slurry to surge upwards, exposing deep agglomerates to the surface for shearing and gas action.

[0012] As the aeration disc moves up and down, it continuously sprays reactive gases (such as Cl2, O2, and N2). Simultaneously, the multi-layered annular gas distribution pipes axially arranged on the inner wall of the furnace work in sync: the gas sprayed by the aeration disc permeates into each layer of the slurry as it moves, forming axial gas channels; the annular gas distribution pipes spray gas laterally, creating cross-convection with the axial gas from the aeration disc, eliminating the "gas short-circuit" phenomenon; the two work together to ensure that every area of ​​the static slurry is in contact with sufficient and uniform reactive gases.

[0013] Preferably, the stirring paddle has serrated stirring blades, and the stirring paddle is driven by a servo motor, which is fixed to the outside of the bottom cover.

[0014] The serrated agitator blades rotate under the drive of a servo motor. The serrations can penetrate deep into the slurry agglomerates and break large agglomerates into smaller particles through shearing action.

[0015] Preferably, the number of stirring paddles is 3 to 4. The 3 to 4 stirring paddles are evenly distributed along the circumference of the bottom cover, and can apply shear force to the slurry from different directions when rotating, forming an all-round radial shear zone.

[0016] Preferably, the aeration disc has a hollow internal structure, and the air distribution pipe and the surface of the aeration disc are distributed with air jet micro-holes with a diameter of 0.3 to 0.5 mm. The pore density of the air jet micro-holes is 20 to 30 per cm2. The air distribution pipe and the aeration disc are connected to an external pipe for air supply.

[0017] Preferably, the top cover is provided with an exhaust port, and the bottom cover is provided with a discharge port, both of which are equipped with high-temperature resistant valves. The exhaust port of the top cover is used to promptly discharge volatile products generated during the reaction from the furnace body, preventing these products from accumulating inside the furnace and affecting the purification effect, or even causing corrosion to the equipment. The discharge port of the bottom cover is used to discharge the processed slurry after purification. The high-temperature resistant valves can precisely control the opening and closing of the exhaust port and the discharge port, as well as the flow rate, according to the needs of the purification process.

[0018] Preferably, the bottom edge of the aeration disc is provided with annularly distributed elastic shearing teeth. These teeth come into contact with the slurry and undergo elastic deformation as the aeration disc moves up and down. When the aeration disc moves downwards, the elastic shearing teeth shear the slurry below, breaking up agglomerates; when it moves upwards, the elastic shearing teeth comb and shear the slurry along its path, further breaking up agglomerates.

[0019] Preferably, the elastic shearing teeth are made of high-temperature resistant elastic alloy material and have a length of 10-15mm. This ensures good elasticity and strength under high-temperature conditions, guaranteeing stable shearing performance. The 10-15mm length design allows the elastic shearing teeth to penetrate deep into the slurry, shearing aggregates at different depths. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the internal structure of a high-temperature purification and treatment device for carbon nanotube slurry.

[0021] Figure 2 for Figure 1 A schematic diagram of the structure after the aeration disc moves downwards;

[0022] Figure 3 for Figure 1 Schematic diagram of the internal structure of the aeration disc;

[0023] Figure 4 This is a schematic diagram of the air distribution pipe.

[0024] Figure 5 This is a bottom view of the aeration disc in Example 2.

[0025] The reference numerals in the accompanying drawings include: discharge port 1, servo motor 2, air distribution pipe 3, stirring blade 4, exhaust port 5, cylinder 6, feed port 7, air inlet pipe 8, aeration disc 9, high temperature resistant hose 10, aeration hole 11, and elastic shearing teeth 12. Detailed Implementation

[0026] The following detailed description illustrates the specific implementation method:

[0027] In the following statements, directional terms such as "left," "right," "up," and "down" are based on the directions shown in the diagram. In practice, if the corresponding structures are changed in the same direction based on the direction while maintaining their relative positions, it will not affect the implementation of the plan.

[0028] Example 1: A high-temperature purification treatment device for carbon nanotube slurry, as described below. Figure 1 The furnace body includes a top cover and a bottom cover that are detachably connected to the top and bottom of the furnace body by bolts. The top cover is equipped with a feed inlet 7, the bottom cover is equipped with a discharge outlet 1, and the furnace body is equipped with an exhaust outlet 5. The feed inlet 7, the discharge outlet 1, and the exhaust outlet 5 are all equipped with high-temperature resistant valves.

[0029] It also includes a dispersion component and an aeration component. The dispersion component includes three agitators evenly distributed along the circumference of the bottom cover. The agitators are driven by a servo motor 2 fixed to the bottom cover and include agitator blades 4. A cylinder 6 is fixedly installed on the top cover. The cylinder 6 drives an aeration disc 9 located at the center of the furnace body and between the three agitators. Three layers of annular air distribution pipes 3 are axially fixed on the inner wall of the furnace body.

[0030] like Figure 3 As shown, the piston rod of cylinder 6 has a hollow section, which is fixed and connected to the aeration disc 9, and also includes an intake pipe 8, as shown. Figure 4 As shown, the air inlet pipe 8 and the air distribution pipe 3 are fixed and connected. A high-temperature resistant hose 10 is fixedly connected between the top of the air inlet pipe 8 and the hollow section of the piston rod. The high-temperature resistant hose 10 can be a high-temperature resistant corrugated pipe with a certain degree of extensibility and length to cooperate with the piston rod to move up and down for stable air supply. The aeration disc 9 and the air distribution pipe 3 are evenly distributed with multiple aeration holes 11.

[0031] The feed inlet 7 and discharge outlet 1 are used for feeding and discharging materials. When it is necessary to clean the inside of the furnace, the bottom cover can be removed downwards, the stirring paddle can be taken out, and the inside can be rinsed.

[0032] like Figure 2As shown, the stirring blades 4 of the agitator rotate under the drive of the servo motor 2. The stirring blades 4 can penetrate deep into the interior of the slurry agglomerates, generating radial shear force on the slurry, tearing the surface and central agglomerates, and preventing the formation of annular dense accumulation zones. At the same time, the cylinder 6 fixed to the top cover drives the aeration disc 9 located in the center of the furnace to move up and down reciprocally. When the aeration disc 9 moves downward, it generates axial thrust on the slurry in the central area, forcing the slurry to spread outward, forming a combined squeezing and shearing effect with the radial shear of the agitator, breaking the traditional dispersion blind zone in the central area; when the aeration disc 9 moves upward, a negative pressure is formed in the space at its bottom, causing the bottom slurry to surge upward, exposing the deep agglomerates to the surface, where they are subjected to shearing and gas action.

[0033] High-pressure gas is injected into the air inlet pipe 8 towards the air distribution pipe 3 and the aeration disc 9. The aeration disc 9 continuously sprays reaction gas (such as Cl2, O2, N2) during its up-and-down movement. When the internal air pressure is too high, the high-temperature resistant valve of the exhaust port 5 exhausts gas to release pressure.

[0034] At the same time, the three-layer annular gas distribution pipe 3 axially arranged on the inner wall of the furnace works, and the gas injected by the aeration disc 9 moves and penetrates into each layer of slurry, forming an axial gas channel; the annular gas distribution pipe 3 injects gas laterally, forming cross-convection with the axial gas of the aeration disc 9, eliminating the "gas short circuit" phenomenon; the two work together to ensure that each area of ​​the static slurry can be in contact with sufficient and uniform reaction gas.

[0035] Example 2: As Figure 5 The bottom edge of the aeration disc 9 shown is fixed with annularly distributed elastic shear teeth 12. The elastic shear teeth 12 face downwards toward the bottom cover. The elastic shear teeth 12 are made of high-temperature resistant elastic rubber material and are 10mm in length.

[0036] The ring-shaped elastic shear teeth 12 at the bottom edge of the aeration disc 9 come into contact with the slurry and undergo elastic deformation as the aeration disc 9 moves up and down. When the aeration disc 9 moves downward, the elastic shear teeth 12 shear the slurry below, breaking up agglomerates; when it moves upward, the elastic shear teeth 12 comb and shear the slurry in its path, further breaking up agglomerates.

[0037] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as screws, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

Claims

1. A high-temperature purification treatment device for carbon nanotube slurry, comprising a furnace body, wherein the furnace body is detachably connected to a top cover and a bottom cover, characterized in that, It also includes a dispersion component and an aeration component; the dispersion component includes multiple stirring paddles evenly distributed along the circumference of the bottom cover, the top cover is fixedly equipped with a cylinder, the cylinder drives an aeration disc located at the center of the furnace body and between the multiple stirring paddles, and the inner wall of the furnace body is axially arranged with multiple layers of annular air distribution pipes.

2. The high-temperature purification equipment for carbon nanotube slurry according to claim 1, characterized in that, The stirring paddle has serrated stirring blades and is driven by a servo motor, which is fixed to the outside of the bottom cover.

3. The high-temperature purification equipment for carbon nanotube slurry according to claim 2, characterized in that, The number of stirring paddles is 3 to 4.

4. The high-temperature purification equipment for carbon nanotube slurry according to claim 3, characterized in that, The aeration disc has a hollow interior, and the air distribution pipe and the surface of the aeration disc are covered with air jet micropores with a diameter of 0.3–0.5 mm. The pore density of the air jet micropores is 20–30 per cm³. 2 The air distribution pipe and the external pipe of the aeration disc are supplied with air.

5. The high-temperature purification equipment for carbon nanotube slurry according to claim 4, characterized in that: The top cover is provided with an exhaust port, and the bottom cover is provided with a discharge port. Both the exhaust port and the discharge port are equipped with high-temperature resistant valves.

6. The high-temperature purification equipment for carbon nanotube slurry according to any one of claims 1 to 5, characterized in that: The bottom edge of the aeration disc is provided with annularly distributed elastic shear teeth.

7. The high-temperature purification equipment for carbon nanotube slurry according to claim 6, characterized in that: The elastic shear teeth are made of high-temperature resistant elastic alloy material and are 10-15mm in length.

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