A method for classifying carbon anode materials

Abstract

This invention relates to a method for classifying carbon anode materials, comprising three steps: primary separation, airflow separation, and material recycling collection. The system structure of this invention is highly integrated and modular, effectively simplifying the difficulty and cost of equipment construction and maintenance, and contributing to improved daily maintenance management and equipment repair efficiency. Simultaneously, it can flexibly meet the needs of efficient screening and classification of carbon anode materials with various particle sizes during operation. Furthermore, during screening, the simultaneous use of mechanical screening and airflow screening effectively improves screening efficiency and accuracy. Moreover, the screening particle size and efficiency can be flexibly adjusted according to actual working needs, thereby greatly improving the flexibility, versatility, and convenience of equipment production and use.

Description

Technical Field

[0001] This invention relates to a method for classifying carbon anode materials, belonging to the field of carbon dioxide sequestration and goaf remediation technology. Background Technology

[0002] In the production of carbon anode materials, due to factors such as production equipment and processes, the resulting carbon anode materials often exhibit a wide variety of particle sizes, with these sizes mixed together. Therefore, to meet the needs of different application environments and conditions, it is necessary to classify and screen the produced carbon anode materials according to their particle size. Currently, this classification and screening process is often carried out using traditional airflow screening equipment and mechanical sieving equipment, as seen in patent applications "202111408010.5" and "An Airflow Classification and Pulverizing Equipment for Processing Soft Carbon Anode Materials," and patent application "202310064373.4." While production equipment or methods such as "an airflow pulverizer and particle size control method for silicon-carbon anode materials" can meet the needs of production operations, they have complex structures, low production efficiency, and high operating and maintenance costs. Furthermore, when performing material screening operations, the particle size levels are often relatively fixed, making it impossible to flexibly adjust the screening structure and screening levels according to actual work and usage needs. As a result, the current cost of screening and grading carbon anode materials in the production and preparation of carbon anode materials is high, and the work efficiency, accuracy, and flexibility are relatively low. In addition, the flexibility and versatility of equipment adjustment are relatively poor.

[0003] To address this technical problem, this solution provides a novel approach for carbon dioxide sequestration using goaf roadways, thus resolving the technical issues encountered in current practical applications. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a method for grading carbon anode materials to overcome the above defects and meet the needs of actual testing operations.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A method for classifying carbon anode materials includes the following steps:

[0007] S1, Primary Separation: First, the screening equipment is connected to the outlet of the carbon anode material production equipment, and the prepared carbon anode material is transported to the primary separation chamber of the screening equipment. After separation in the primary separation chamber, the carbon anode material whose particle size meets the screening standard is collected and transported to the secondary separation chamber; at the same time, the carbon anode material that does not meet the screening standard is transported to the crushing equipment of the screening equipment for crushing, and the crushed carbon anode material is transported back to the primary separation chamber of the screening equipment for recycling.

[0008] S2, airflow sorting: The carbon anode material conveyed to the secondary sorting chamber in step S1 is sieved by a mechanical sieving mechanism to perform secondary sorting of the carbon anode material. Then, airflow with different pressures and flow rates is used to perform airflow sieving of the secondary sorted carbon anode material, and the sieved carbon anode materials are classified and stored.

[0009] S3, Material recycling and collection: The carbon anode material remaining after the airflow separation in step S2 is returned to the crushing equipment of the screening equipment for crushing, and the crushed carbon anode material is then transported back to the primary sorting chamber of the screening equipment for recycling and sorting.

[0010] Furthermore, in step S2, when performing airflow sieving, the separating airflow uses any one of carbon dioxide, nitrogen, or argon with a water content of no more than 1% and a temperature of -5℃ to 10℃.

[0011] Furthermore, the screening equipment includes a frame, a primary sorting chamber, an airflow sorting chamber, a crushing mechanism, a high-pressure air source, a material recovery chamber, a guide pipe, a return pipe, and a drive circuit. The primary sorting chamber, the airflow sorting chamber, and the crushing mechanism are all connected to the frame and distributed from top to bottom along the frame axis. There are at least two airflow sorting chambers, which are connected in parallel. The inlet of each airflow sorting chamber is connected to the outlet of the primary sorting chamber via a guide pipe, and the outlet of each airflow sorting chamber is connected to at least two material recovery chambers via guide pipes. The discharge port of the primary sorting chamber and the discharge ports of each airflow sorting chamber are connected to the inlet of the crushing mechanism through guide pipes. At the same time, the discharge port of the crushing mechanism is connected to the inlet of the primary sorting chamber through a return pipe. The material recovery chamber is connected to the outer side of the frame. The high-pressure air source is embedded in the frame. Its air supply end is connected to each airflow sorting chamber through an air guide pipe, and its return end is connected to the material recovery chamber through a guide pipe. The drive circuit is connected to the outer side of the frame and is electrically connected to the primary sorting chamber, the airflow sorting chamber, the crushing mechanism, the high-pressure air source, and the material recovery chamber.

[0012] Furthermore, both the primary sorting chamber and the airflow sorting chamber include a working tank, a screening barrel, a rotary drive mechanism, a lifting drive mechanism, a base, and a guide pipe. The working tank is a cylindrical closed cavity structure with a rectangular axial cross-section, and its front and rear faces are respectively provided with a feed inlet and a discharge outlet coaxially distributed therewith. A discharge outlet is located at the bottom of the rear face of the working tank and is connected to the guide pipe. Simultaneously, the axis of the working tank forms an angle of 30°–60° with the horizontal plane, and the feed inlet is located above the discharge outlet. At least one screening barrel is located inside the working tank. The screening barrel is coaxially distributed with the working tank. The outer surfaces of both ends of the screening barrel are connected to the upper surface of the base through a rotary drive mechanism. The lower surface of the base is connected to the inner surface of the working tank through a lifting drive mechanism. The direction of movement of the lifting drive mechanism is perpendicular to the axis of the working tank. The screening barrel has a cylindrical cavity structure. Its front and rear surfaces are connected to a drain pipe. The drain pipe is located outside the working tank through the inlet and outlet and is slidably connected to the side walls of the inlet and outlet. The rotary drive mechanism and the lifting drive mechanism are electrically connected to the drive circuit.

[0013] Furthermore, the screening barrel includes baffles, support columns, guide plates, screening mesh plates, spring sheets, an oscillation mechanism, and a flow guide hood. There are two baffles, both circular plate-shaped structures, coaxially distributed and connected to each other by several support columns. Each support column is evenly distributed around the axis of the baffle and perpendicular to the baffle surface. The baffles and the support columns form a cylindrical cage-like frame structure. Each baffle has a guide hole coaxially distributed with it, and the baffle covers the flow guide pipe through the guide hole and is slidably connected to the flow guide pipe. Additionally, the outer surface of the baffle is connected to the rotation drive mechanism. The screening mesh plate is a cylindrical cavity structure coaxially distributed with the baffles and embedded within the support cage. The flow guide is a frustum-shaped tubular structure that is embedded in the cylindrical cavity of the screening mesh plate through several elastic contacts and the support column. It is connected to the inner side of the screening mesh plate and coaxially distributed with the support cage. Each flow guide is distributed along the axis of the support cage. There are several guide plates, each of which is distributed in a spiral structure around the axis of the support cage and is connected to the outer surface of the support column of the support cage and the inner side of the screening mesh plate. At the same time, the surface of each guide plate is at an angle of 30° to 60° with the axis of the support cage. There are at least three oscillation mechanisms that are connected to the outer side of the support cage and distributed in a spiral structure around the axis of the support cage. The oscillation mechanisms are connected in parallel and electrically connected to the drive circuit.

[0014] Furthermore, the airflow separation chamber contains at least two screening barrels, which are interconnected and distributed along the axis of the airflow separation chamber. Adjacent screening barrels are also interconnected, and the aperture of the screen holes in each screening barrel increases progressively from the inlet to the outlet. Additionally, an airflow separation mechanism is provided within the airflow separation chamber. The airflow separation chamber includes a sealed air chamber, air inlets, return air inlets, a flow sensor, a discharge pipe, and a one-way valve. The sealed air chamber covers the screening barrels and is coaxially distributed with them. The inner side of the sealed air chamber abuts against and slides against the guide plate end face on the outer side of the screening barrels. Several air inlets are embedded in the inner side of the sealed air chamber, and each air inlet is located below the axis of the screening barrel. The axes of each air inlet are perpendicular to and intersect the axis of the screening barrel. At least two return air inlets are embedded in the inner side of the sealed air chamber, and each return air inlet is located along the axis of the screen hole. The air vents are evenly distributed along the axis of the screening tank and located directly above it. Simultaneously, the axes of each return air vent are perpendicular to and intersect the axis of the screening tank. The bottom and top of the corresponding working tanks for each air supply and return air vent are respectively provided with an air inlet and an exhaust outlet. The air inlet is connected to each air supply vent via a guide pipe and to a high-pressure air source via a guide pipe. The exhaust outlet is connected to each return air vent via a guide pipe and to the discharge pipe. The upper end of the discharge pipe is connected to the discharge port of the working tank in the airflow separation chamber, and the lower end is connected to the material recovery chamber via a guide pipe. A return port is located on the side wall of the discharge pipe, connected to a guide pipe via a one-way valve, and then to the exhaust outlet via the guide pipe. The flow sensor and the one-way valve are electrically connected to the drive circuit, and the flow sensor is located at both the air inlet and exhaust outlet.

[0015] Further, the material recovery chamber includes a storage tank, a spiral diverter, a lifting drive mechanism, a diversion air pipe, a ranging sensor, an electrostatic adsorption electrode, and an electrostatic power supply. The storage tank is a closed cavity structure with a rectangular axial cross-section, and its axis is vertically distributed with respect to the horizontal plane. An air inlet and an exhaust port are provided at the top of the storage tank, and the air inlet and the exhaust port are symmetrically distributed on both sides of the axis of the storage tank. At the same time, a material discharge port coaxial with it is provided at the bottom of the storage tank. The air inlet is connected to the air separation chamber through a diversion pipe, and the exhaust port is connected to a high-pressure air source through a guide pipe. At the same time, both the air inlet and the exhaust port are connected to the spiral diverter through a diversion air pipe. The spiral diverter is located inside the storage tank, coaxially distributed with the inside of the storage tank, and is slidably connected to the side wall of the storage tank through a lifting drive mechanism. The distance between the lower end surface of the spiral diverter and the bottom of the storage tank is not less than 30% of the height of the storage tank. At the same time, a ranging sensor is provided on the lower end surface of the spiral diverter. A number of electrostatic adsorption electrodes are located below the spiral diverter and are connected to the inner side surface of the storage tank. At the same time, the electrostatic adsorption electrodes are connected in parallel and are electrically connected to the electrostatic power supply respectively. The electrostatic power supply is connected to the outer side surface of the storage tank, and the lifting drive mechanism, the ranging sensor, and the electrostatic power supply are all electrically connected to the drive circuit.

[0016] Further, the spiral diverter includes a diversion cover, a diversion cone, a jet port, and an elastic filter layer. The diversion cover is a cylindrical groove structure with a "冂"-shaped axial cross-section. An assembly hole coaxial with it is provided at the top of the diversion cover, and the diversion cover is wrapped outside the diversion cone through the assembly hole and is coaxially distributed with the diversion cone. The diversion cone is a conical tubular structure, and both the top and the bottom of the diversion cone extend at least 5 cm outside the upper end surface and the lower end surface of the diversion cover. The outer diameter of the lower end surface of the diversion cone is 40%-80% of the outer diameter of the lower end surface of the diversion cover. At the same time, at least one layer of elastic filter layer is provided inside the upper end surface and the lower end surface of the diversion cone, and the upper end surface of the diversion cone is connected to the exhaust port through a diversion air pipe. At least two jet ports evenly distributed around its axis are provided at the top of the diversion cover. The axis of the jet port is tangent to the outer side surface of the diversion cone, and the axis of the jet port forms an angle of 10°-45° with the upper end surface of the diversion cover. At the same time, at least one spiral drainage groove is provided on the inner side surface of the diversion cover and the outer side surface of the diversion cone and is distributed in a spiral structure around the axis of the diversion cone. The axis of each jet port intersects the bottom of the drainage groove. At the same time, each jet port is connected to the air inlet through a diversion air pipe. The lower end surface of the diversion cover is connected to at least one ranging sensor, and the axis of the ranging sensor is parallel to the axis of the storage tank.

[0017] Further, the drive circuit is a circuit system based on a programmable controller, and the drive circuit is further provided with a number of serial communication ports.

[0018] The system structure of this invention is highly integrated and modular, effectively simplifying the difficulty and cost of equipment construction and maintenance, and helping to improve the efficiency of daily equipment maintenance and repair. At the same time, it can flexibly meet the needs of efficient screening and grading of carbon anode materials of various particle sizes during operation. During screening, on the one hand, the simultaneous use of mechanical screening and airflow screening effectively improves the screening efficiency and screening accuracy. On the other hand, the screening particle size and screening efficiency can be flexibly adjusted according to actual working needs, thereby greatly improving the flexibility, versatility and convenience of equipment production and use. Attached Figure Description

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a flowchart of the method of the present invention;

[0021] Figure 2 This is a schematic diagram of a partial structure of the screening equipment;

[0022] Figure 3 Schematic diagram of partial structure of primary sorting chamber and airflow sorting chamber;

[0023] Figure 4 This is a schematic diagram of a partial axial cross-section of the screening barrel;

[0024] Figure 5 This is a partial structural diagram of the cross-section of the screening barrel;

[0025] Figure 6 This is a schematic diagram of another partial structure of the airflow sorting chamber;

[0026] Figure 7 This is a partial cross-sectional structural diagram of the material recovery chamber. Detailed Implementation

[0027] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0028] like Figure 1 As shown in Figure 7, a method for grading carbon anode materials includes the following steps:

[0029] S1, Primary Separation: First, the screening equipment is connected to the outlet of the carbon anode material production equipment, and the prepared carbon anode material is transported to the primary separation chamber of the screening equipment. After separation in the primary separation chamber, the carbon anode material whose particle size meets the screening standard is collected and transported to the secondary separation chamber; at the same time, the carbon anode material that does not meet the screening standard is transported to the crushing equipment of the screening equipment for crushing, and the crushed carbon anode material is transported back to the primary separation chamber of the screening equipment for recycling.

[0030] S2, airflow sorting: The carbon anode material conveyed to the secondary sorting chamber in step S1 is sieved by a mechanical sieving mechanism to perform secondary sorting of the carbon anode material. Then, airflow with different pressures and flow rates is used to perform airflow sieving of the secondary sorted carbon anode material, and the sieved carbon anode materials are classified and stored.

[0031] S3, Material recycling and collection: The carbon anode material remaining after the airflow separation in step S2 is returned to the crushing equipment of the screening equipment for crushing, and the crushed carbon anode material is then transported back to the primary sorting chamber of the screening equipment for recycling and sorting.

[0032] In a further optimized step S1, the water content of the carbon anode material to be graded output by the carbon anode material production equipment is no more than 1%, and the temperature of the carbon anode material is 20℃-90℃. Furthermore, each carbon anode material production equipment can be connected to multiple screening equipment simultaneously to form a working group.

[0033] In this embodiment, during step S2, the airflow used for airflow sieving is any one of carbon dioxide, nitrogen, or argon with a water content of no more than 1% and a temperature of -5℃ to 10℃.

[0034] In this embodiment, the screening equipment includes a frame 1, a primary sorting chamber 2, an airflow sorting chamber 3, a crushing mechanism 4, a high-pressure air source 5, a material recovery chamber 6, a guide pipe 7, a return pipe 8, and a drive circuit 9. The primary sorting chamber 2, the airflow sorting chamber 3, and the crushing mechanism 4 are all connected to the frame 1 and distributed from top to bottom along the axis of the frame 1. There are at least two airflow sorting chambers 3, which are connected in parallel. The inlet 101 of each airflow sorting chamber 3 is connected to the outlet 102 of the primary sorting chamber 2 via the guide pipe 7. The outlet 102 of each airflow sorting chamber 3 is connected to at least two material recovery chambers 6 via the guide pipe 7. The discharge port 103 of the sorting chamber 2 and the discharge ports 103 of each airflow sorting chamber are connected to the inlet 101 of the crushing mechanism 4 through the guide pipe 7. At the same time, the outlet 102 of the crushing mechanism 4 is connected to the inlet 101 of the primary sorting chamber 2 through the return pipe 8. The material recovery chamber 6 is connected to the outer side of the frame 1. The high-pressure air source 5 is embedded in the frame 1. Its air supply end is connected to each airflow sorting chamber 3 through the air guide pipe, and its return end is connected to the material recovery chamber 6 through the guide pipe 7. The drive circuit 9 is connected to the outer side of the frame 1 and is electrically connected to the primary sorting chamber 2, the airflow sorting chamber 3, the crushing mechanism 4, the high-pressure air source 5, and the material recovery chamber 6.

[0035] The primary sorting chamber 2 and the airflow sorting chamber 3 each include a working tank 21, a screening barrel 22, a rotary drive mechanism 23, a lifting drive mechanism 24, a base 25, and a guide pipe 26. The working tank 21 is a cylindrical closed cavity structure with a rectangular axial cross-section. Its front and rear faces are respectively provided with an inlet 101 and a outlet 103 coaxially distributed therewith. An outlet 102 is located at the bottom of the rear face of the working tank 21 and is connected to the guide pipe 7. The axis of the working tank 21 forms an angle of 30°–60° with the horizontal plane, and the inlet 101 is located above the outlet 103. At least one screening barrel 22 is located inside the working tank 21. The screening barrel 22 is coaxially distributed with the working tank 21. The outer surfaces of both ends of the screening barrel 22 are connected to the upper surface of the base 25 through the rotary drive mechanism 23. The lower surface of the base 25 is connected to the inner surface of the working tank 21 through the lifting drive mechanism 24. The movement direction of the lifting drive mechanism 24 is perpendicular to the axis of the working tank 21. The screening barrel 22 has a cylindrical cavity structure. Its front end and rear end are connected to a drain pipe 26. The drain pipe 26 is located outside the working tank through the feed inlet 101 and the discharge outlet 103, and is slidably connected to the side walls of the feed inlet 101 and the discharge outlet 103. The rotary drive mechanism 23 and the lifting drive mechanism 24 are both electrically connected to the drive circuit 9.

[0036] The drain pipe 26 is connected to the side walls of the feed inlet 101 and the discharge outlet 103 via bearings, and an elastic sealing cover 10 is provided inside the feed inlet 101 and the discharge outlet 103, which covers the drain pipe 26.

[0037] At the same time, the lifting drive mechanism 24 flexibly adjusts the working position of the base 25, thereby adjusting the angle between the axis of the working tank and the horizontal plane. That is, the larger the angle, the faster the material passes through the working tank and the higher the screening efficiency, but the screening progress decreases accordingly.

[0038] It is important to note that the screening barrel 22 includes baffles 221, support columns 222, guide plates 223, screening mesh 224, spring sheets 225, oscillation mechanism 226, and flow guide hood 227. There are two baffles 221, both circular plate-shaped structures, coaxially distributed and interconnected by several support columns 222. Each support column 222 is evenly distributed around the axis of the baffle 221 and perpendicular to the surface of the baffle 221. The baffles 221 and the support columns 222 form a cylindrical cage-like frame structure, a support cage 228. Each baffle 221 has a guide hole 229 coaxially distributed with it, and the baffle 221 covers the outside of the flow guide pipe 26 through the guide hole 229 and is slidably connected to the flow guide pipe 26. Furthermore, the outer surface of the baffle 221 is connected to the rotation drive mechanism 23. The screening mesh 224 is a cylindrical cavity structure coaxially distributed with the baffles 221. The flow guide 227 is a frustum-shaped tubular structure embedded in the cylindrical cavity structure of the screening mesh plate 224, connected to the inner side of the screening mesh plate 224 and coaxially distributed with the support cage 228. Each flow guide 227 is distributed along the axial direction of the support cage 228. There are several flow guide plates 223, each flow guide plate 223 is distributed in a spiral structure around the axis of the support cage 228, and is connected to the outer surface of the support column 222 of the support cage 228 and the inner side of the screening mesh plate 224. At the same time, the surface of each flow guide plate 223 forms an angle of 30° to 60° with the axis of the support cage 228. There are at least three oscillation mechanisms 226, which are connected to the outer side of the support cage 228 and distributed in a spiral structure around the axis of the support cage 228. At the same time, the oscillation mechanisms 226 are connected in parallel and electrically connected to the drive circuit 9.

[0039] By cooperating between the oscillation mechanism 226 and the spring sheet 225, mechanical vibration of the screening screen 224 can be achieved during the screening operation. The vibration force is used to screen the material flowing through the screening screen 224 on the one hand, and to clean the material particles blocked in the screening screen 224 on the other hand, thus preventing the screening screen 224 from becoming blocked.

[0040] Simultaneously, while the screening barrel rotates under the drive of the rotary drive mechanism to perform material screening, the guide plate set inside the carrying cage forms a spiral channel around the carrying cage, causing the material to be screened to flow along the spiral channel and be screened during the flow process. The spiral channel effectively reduces the speed of the material passing through the screening barrel, thereby improving the screening accuracy. In addition, while adjusting and limiting the flow speed of the material to be screened through the spiral channel, the set-in guide hood further reduces the residence time of the material in the carrying cage, further improving the screening accuracy. At the same time, the frustum-shaped tubular structure set in the guide hood can adjust the flow direction of the material and create a height difference in the material flow process in the carrying cage, thereby further improving the screening efficiency and accuracy.

[0041] In addition, the guide plate set outside the carrying cage can drive the screened material in a spiral while rotating with the screening barrel, improving the efficiency of the screened material being discharged from the outlet.

[0042] It should be noted that there are at least two screening barrels 22 in the airflow separation chamber 3. The screening barrels 22 are interconnected and distributed along the axis of the airflow separation chamber 3. Adjacent screening barrels 22 are also interconnected. The aperture of the screen holes in each screening barrel 22 increases gradually from the feed inlet 101 to the discharge outlet 103. In addition, an airflow separation mechanism 11 is provided in the airflow separation chamber 3. The airflow separation mechanism 11 includes a sealed air chamber 111, an air inlet 112, a return air inlet 113, a flow sensor 114, a discharge pipe 115, and a one-way valve 116. The sealed air chamber 111 covers the outside of the screening barrel 22 and is coaxially distributed with the screening barrel 22. The inner side of the sealed air chamber 111 abuts against and is slidably connected to the end face of the guide plate 223 on the outer side of the screening barrel 22. Several air outlets 112 are provided, each embedded in the inner side of the sealed air chamber 111. Each air outlet 112 is located below the axis of the screening barrel 22, and the axes of each air outlet 112 are perpendicular to and intersect with the axis of the screening barrel 22. At least two return air outlets 113 are embedded in the inner side of the sealed air chamber 111. Each return air vent 113 is evenly distributed along the axis of the screening barrel 22 and located directly above the screening barrel 22. Simultaneously, the axis of each return air vent 113 is perpendicular to and intersects the axis of the screening barrel 22. The bottom and top positions of the corresponding working tank 21 for the air supply vent 112 and return air vent 113 are respectively provided with an air inlet 12 and an exhaust outlet 13. The air inlet 12 is connected to each air supply vent 112 via a guide branch pipe and to the high-pressure air source 5 via a guide pipe. Simultaneously, the exhaust outlet 13 is connected to each return air vent 113 via a guide branch pipe. On the one hand, it is connected to the discharge pipe 13, and on the other hand, it is connected to the discharge pipe 115. The upper end face of the discharge pipe 115 is connected to the discharge port 102 of the working tank 21 of the airflow separation chamber 3, and the lower end face is connected to the material recovery chamber 6 through the air guide pipe. At the same time, a return port 117 is provided on the side wall of the discharge pipe 115, and the return port 117 is connected to a guide branch pipe through a one-way valve 116, and is connected to the exhaust port 13 through the guide branch pipe. The flow sensor 114 and the one-way valve 116 are both electrically connected to the drive circuit 9, and the flow sensor is located at the air inlet and the exhaust port.

[0043] The airflow separation chamber is equipped with multiple screening barrels, and the aperture of each screening barrel can be adjusted step by step to meet the need for screening multiple materials of different particle sizes in a single airflow separation chamber.

[0044] Meanwhile, during the screening process, on the one hand, the material is screened by mechanical force through the screening barrel, and on the other hand, the high-pressure airflow from the high-pressure air source is delivered to the screening barrel through the air outlet. By using the pressure of different airflows, the material to be screened by airflow is screened for a specific weight. The screened material particles are then concentrated and transported from the return air outlet to the discharge pipe under the drive of the airflow, and then transported to the material recovery chamber through the discharge pipe under the airflow, thus completing the material transportation.

[0045] Therefore, in material conveying, while mechanical screening is carried out through the screening barrel, the airflow pressure can be adjusted to achieve the need for secondary precise screening of materials with specific particle size or weight-based particle size structure, thereby further improving the accuracy of the screening operation.

[0046] In this embodiment, the material recovery chamber 6 includes a collection tank 61, a spiral diverter 62, a lifting drive mechanism 24, a guide air pipe 63, a ranging sensor 64, an electrostatic adsorption electrode 65, and an electrostatic power supply 66. The collection tank 61 is a closed cavity structure with a rectangular axial cross-section, and its axis is perpendicular to the horizontal plane. The top of the collection tank 61 is provided with an air inlet 12 and an exhaust outlet 13, which are symmetrically distributed on both sides of the axis of the collection tank 61. At the same time, the bottom of the collection tank 61 is provided with a material discharge outlet coaxially distributed therewith. The air inlet 12 is connected to the airflow separation chamber 3 through a guide pipe 7, and the exhaust outlet 13 is connected to the high-pressure air source 5 through a guide air pipe. At the same time, both the air inlet 12 and the exhaust outlet 13 are connected to the spiral diverter 62 through the guide air pipe 63. The spiral diverter 62 is connected and located inside the storage tank 61. It is coaxially distributed inside the storage tank 61 and slidably connected to the side wall of the storage tank 61 through the lifting drive mechanism 24. The distance between the lower end face of the spiral diverter 62 and the bottom of the storage tank 61 is not less than 30% of the height of the storage tank 61. At the same time, a distance sensor 64 is provided on the lower end face of the spiral diverter 62. Several electrostatic adsorption electrodes 65 are located below the spiral diverter 62 and connected to the inner side of the storage tank 61. At the same time, each electrostatic adsorption electrode 65 is connected in parallel and electrically connected to the electrostatic power supply 66. The electrostatic power supply 66 is connected to the outer side of the storage tank 61. The lifting drive mechanism 24, the distance sensor 64 and the electrostatic power supply 66 are all electrically connected to the drive circuit 9.

[0047] When collecting and storing the screened material, the screened material is conveyed from the air inlet to the spiral distributor with the airflow. The material first flows at high speed in the spiral distributor and flows from top to bottom along the axis of the spiral distributor. During the spiral flow, centrifugal force is used to separate the solid material from the airflow. At the same time, the solid material in the airflow is actively adsorbed by the electrostatic adsorption electrodes set in the collection tank, which further improves the separation efficiency between the solid material and the airflow. Finally, the airflow is discharged through the spiral distributor. When the airflow is discharged through the spiral distributor, the spiral distributor filters and separates the solid material in the airflow, which further meets the need for collecting and storing the screened material. At the same time, the airflow that has been separated and discharged returns to the high-pressure air source and is recycled after being pressurized.

[0048] Further optimized, the spiral diverter 62 includes a diversion cover 621, a drainage cone 622, a jet port 623, and an elastic filter layer 624. The diversion cover 621 is a cylindrical groove structure with a "冂"-shaped axial cross-section. At the top of the diversion cover 621, there is an assembly hole 625 distributed coaxially with it, and it is covered outside the drainage cone 622 through the assembly hole 625 and is coaxially distributed with the drainage cone 622. The drainage cone 622 is a conical tubular structure, and both the top and bottom of the drainage cone 622 extend at least 5 cm outside the upper and lower end faces of the diversion cover 621. The outer diameter of the lower end face of the drainage cone 622 is 40% - 80% of the outer diameter of the lower end face of the diversion cover 621. At the same time, at least one layer of elastic filter layer 624 is provided inside both the upper and lower end faces of the drainage cone 622, and the upper end face of the drainage cone 622 is connected to the exhaust port 13 through a diversion air pipe. At least two jet ports 623 evenly distributed around its axis are provided at the top of the diversion cover 621. The axis of the jet port 623 is tangent to the outer side surface of the drainage cone 622, and the axis of the jet port 623 forms an angle of 10° - 45° with the upper end face of the diversion cover 621. At the same time, at least one drainage groove 626 distributed in a spiral structure around the axis of the drainage cone 622 is provided on both the inner side surface of the diversion cover 621 and the outer side surface of the drainage cone 622, and the axis of each jet port 623 intersects the bottom of the drainage groove 626. At the same time, each jet port 623 is connected to the air inlet 12 through a diversion air pipe. The lower end face of the diversion cover 621 is connected to at least one distance sensor 64, and the axis of the distance sensor 64 is parallel to the axis of the storage tank.

[0049] During operation, the air flow and the material are transported to the inside of the diversion cover through the jet ports and are tangent to the outer side surface of the drainage cone. At the same time, they are directly transported to the drainage grooves provided outside the drainage cone. Under the drive of air pressure, the gas and the material perform efficient spiral movement along the drainage grooves, form a centrifugal force through the spiral movement, and use the centrifugal force to separate the gas from the solid material. At the same time, using the conical structure of the provided drainage cone, while the air flow flows spirally from top to bottom along the drainage groove, since the circumference above the drainage cone is smaller than the circumference below, the flow rate and pressure of the material decrease from top to bottom along the axial direction of the drainage cone, which is beneficial to the separation between the solid material and the gas.

[0050] At the same time, the provided distance sensor detects the distance between the solid material collected in the storage tank and the lower end face of the spiral diverter, so as to obtain the detection of the solid material collection amount in the storage tank. At the same time, the lifting drive mechanism can be driven to operate according to the detected data, and the height of the spiral diverter can be adjusted synchronously.

[0051] In this embodiment, the drive circuit 9 is a circuit system based on a programmable controller, and several serial communication ports are additionally provided in the drive circuit 9.

[0052] Further optimization is achieved by using any one of the following structures: a gear and rack mechanism, an electric telescopic rod, a hydraulic telescopic rod, or a pneumatic telescopic rod; and the guide plate is any one of the following structures: a rectangular plate structure, a grid plate mechanism, a steel brush mechanism, or a brush structure.

[0053] The system structure of this invention is highly integrated and modular, effectively simplifying the difficulty and cost of equipment construction and maintenance, and helping to improve the efficiency of daily equipment maintenance and repair. At the same time, it can flexibly meet the needs of efficient screening and grading of carbon anode materials of various particle sizes during operation. During screening, on the one hand, the simultaneous use of mechanical screening and airflow screening effectively improves the screening efficiency and screening accuracy. On the other hand, the screening particle size and screening efficiency can be flexibly adjusted according to actual working needs, thereby greatly improving the flexibility, versatility and convenience of equipment production and use.

[0054] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for classifying carbon anode materials, characterized in that: The classification method of carbon negative electrode materials includes the following steps: S1. Primary separation: First, connect the screening device to the discharge port of the carbon negative electrode material production device, and transport the prepared carbon negative electrode materials to the primary sorting chamber of the screening device. After sorting through the primary sorting chamber, collect the carbon negative electrode materials with particle sizes meeting the screening standard and transport them to the secondary sorting chamber; at the same time, transport the carbon negative electrode materials that do not meet the screening standard to the crushing device of the screening device for crushing, and transport the crushed carbon negative electrode materials back to the primary sorting chamber of the screening device for cyclic sorting; S2. Airflow sorting: The carbon negative electrode materials transported to the secondary sorting chamber in step S1 are screened through a mechanical screening mechanism to perform secondary sorting on the carbon negative electrode materials, and then use airflows with different pressures and flow rates to perform airflow screening on the carbon negative electrode materials after secondary sorting, and classify and store the screened carbon negative electrode materials at each level; S3. Material recycling and collection: Transport the carbon negative electrode materials remaining after airflow sorting in step S2 back to the crushing device of the screening device for crushing, and transport the crushed carbon negative electrode materials back to the primary sorting chamber of the screening device for cyclic sorting; The screening device includes a frame, a primary sorting chamber, an airflow sorting chamber, a crushing mechanism, a high-pressure gas source, a material recovery chamber, a diversion pipe, a return pipe, and a drive circuit; the primary sorting chamber and the airflow sorting chamber each include an operation tank, a screening barrel, a rotation drive mechanism, a lifting drive mechanism, a bottom support, and a drainage pipe; the screening barrel includes a baffle, a bearing column, a diversion plate, a screening mesh plate, a spring piece, an oscillation mechanism, and a drainage cover; there are two baffles in total, both of which are circular plate-like structures, coaxially distributed between the two baffles and connected to each other through a number of bearing columns. A bearing cage with a cylindrical cage-like frame structure is formed between the baffle and each bearing column. The screening mesh plate is a cylindrical cavity structure coaxially distributed with the baffle, embedded in the bearing cage and elastically connected to the bearing column through a number of spring pieces; the material recovery chamber includes a storage tank, a spiral shunt, a lifting drive mechanism, a diversion air pipe, a ranging sensor, an electrostatic adsorption electrode, and an electrostatic power supply. The spiral shunt includes a diversion cover, a diversion cone, a jet port, and an elastic filter layer. The diversion cover is a cylindrical groove structure with a "冂"-shaped axial cross-section, and the diversion cone is a conical tubular structure. At least one layer of elastic filter layer is provided on both the upper and lower end surfaces of the diversion cone. At least two jet ports evenly distributed around its axis are provided at the top of the diversion cover. The axis of the jet port is tangent to the outer side surface of the diversion cone. At least one drainage groove in a spiral structure around the axis of the diversion cone is provided on both the inner side surface of the diversion cover and the outer side surface of the diversion cone.

2. The method for grading carbon anode materials according to claim 1, characterized in that, In step S2, when performing airflow screening, the sorting airflow uses any one of carbon dioxide, nitrogen, and argon with a water content not greater than 1% and a temperature of -5°C - 10°C.

3. The method for grading carbon anode materials according to claim 1, characterized in that, The primary sorting chamber, airflow sorting chamber, and crushing mechanism are all connected to the frame and distributed from top to bottom along the frame axis. There are at least two airflow sorting chambers, which are connected in parallel. The inlet of each airflow sorting chamber is connected to the outlet of the primary sorting chamber through a guide pipe. The outlet of each airflow sorting chamber is connected to at least two material recovery chambers through a guide pipe. The discharge port of the primary sorting chamber and the discharge port of each airflow sorting chamber are connected to the inlet of the crushing mechanism through a guide pipe. The discharge port of the crushing mechanism is connected to the inlet of the primary sorting chamber through a return pipe. The material recovery chamber is connected to the outer side of the frame. The high-pressure air source is embedded in the frame. Its air supply end is connected to each airflow sorting chamber through an air guide pipe, and its return end is connected to the material recovery chamber through a guide pipe. The drive circuit is connected to the outer side of the frame and is electrically connected to the primary sorting chamber, airflow sorting chamber, crushing mechanism, high-pressure air source, and material recovery chamber.

4. The method for grading carbon anode materials according to claim 3, characterized in that, The working tank is a cylindrical closed cavity structure with a rectangular axial cross-section. It has a feed inlet and a discharge outlet coaxially distributed on its front and rear faces, respectively. A discharge outlet is located at the bottom of the rear face of the working tank and is connected to a guide pipe. The axis of the working tank forms an angle of 30°–60° with the horizontal plane, and the feed inlet is located above the discharge outlet. At least one screening barrel is located inside the working tank and coaxially distributed with it. The outer surfaces of both ends of the screening barrel are connected to the upper surface of the base via a rotary drive mechanism. The lower surface of the base is connected to the inner surface of the working tank via a lifting drive mechanism, with the lifting drive mechanism moving perpendicular to the axis of the working tank. The screening barrel is a cylindrical cavity structure, with its front and rear faces connected to a guide pipe. The guide pipe is located outside the working tank through the feed inlet and discharge outlet and is slidably connected to the side walls of the feed inlet and discharge outlet. Both the rotary drive mechanism and the lifting drive mechanism are electrically connected to the drive circuit.

5. The method for grading carbon anode materials according to claim 4, characterized in that, Each supporting column is evenly distributed around the axis of the baffle and perpendicular to the baffle surface. Each baffle has a guide hole coaxially distributed with it, and the baffle covers the outside of the drainage pipe through the guide hole and is slidably connected to the drainage pipe. In addition, the outer side of the baffle is connected to the rotary drive mechanism. The drainage hood is a frustum-shaped tubular structure, embedded in the cylindrical cavity structure of the screening screen plate, connected to the inner side of the screening screen plate and coaxially distributed with the supporting cage. Each drainage hood is distributed along the axis of the supporting cage. There are several guide plates, each of which is distributed in a spiral structure around the axis of the supporting cage and is connected to the outer surface of the supporting column of the supporting cage and the inner side of the screening screen plate. At the same time, the surface of each guide plate is at an angle of 30° to 60° with the axis of the supporting cage. There are at least three oscillation mechanisms, which are connected to the outer side of the supporting cage and distributed in a spiral structure around the axis of the supporting cage. The oscillation mechanisms are connected in parallel and electrically connected to the drive circuit.

6. A method for grading carbon anode materials according to claim 3, 4, or 5, characterized in that, The airflow separation chamber contains at least two screening barrels, which are interconnected and distributed along the axis of the airflow separation chamber. Adjacent screening barrels are also interconnected, and the aperture size of the screens in each barrel increases progressively from the inlet to the outlet. An airflow separation mechanism is also provided within the airflow separation chamber. The airflow separation chamber includes a sealed air chamber, air inlets, return air inlets, a flow sensor, a discharge pipe, and a one-way valve. The sealed air chamber surrounds the screening barrels and is coaxially distributed with them. The inner side of the sealed air chamber abuts against and slides against the guide plate end face on the outer side of the screening barrels. Several air inlets are embedded in the inner side of the sealed air chamber, and each air inlet is located below the axis of the screening barrel. The axes of the air inlets are perpendicular to and intersect with the axis of the screening barrels. At least two return air inlets are embedded in the inner side of the sealed air chamber, and each return air inlet is along the axis of the screening barrel. The air inlets are evenly distributed along the direction of the air flow and located directly above the screening tank. The axes of all return air inlets are perpendicular to and intersect the axis of the screening tank. The bottom and top of the corresponding working tanks for the air supply and return air inlets are each equipped with an air inlet and an air outlet, respectively. The air inlets are connected to the air supply inlets via a guide pipe and to a high-pressure air source via a guide pipe. The air outlets are connected to the return air inlets via a guide pipe and to the discharge pipe. The upper end of the discharge pipe is connected to the discharge port of the working tank in the airflow separation chamber, and the lower end is connected to the material recovery chamber via a guide pipe. A return port is located on the side wall of the discharge pipe, connected to a guide pipe via a one-way valve, and then to the exhaust port via this guide pipe. The flow sensor and the one-way valve are electrically connected to the drive circuit, and the flow sensor is located at both the air inlet and the exhaust port.

7. The method for grading carbon anode materials according to claim 3, characterized in that, The storage tank is a closed cavity structure with a rectangular axial cross-section, and its axis is perpendicular to the horizontal plane. The top of the storage tank has an air inlet and an exhaust outlet, symmetrically distributed on both sides of the tank's axis. The bottom of the storage tank has a material discharge outlet coaxially distributed with it. The air inlet is connected to the airflow separation chamber via a guide pipe, and the exhaust outlet is connected to a high-pressure air source via a guide pipe. Both the air inlet and exhaust outlet are connected to a spiral distributor via guide pipes. The spiral distributor is located inside the storage tank and is coaxial with the tank's internal structure. The spiral diverter is distributed and slidably connected to the side wall of the storage tank via a lifting drive mechanism. The distance between the lower end face of the spiral diverter and the bottom of the storage tank is not less than 30% of the height of the storage tank. At the same time, a distance sensor is provided on the lower end face of the spiral diverter, and several electrostatic adsorption electrodes are located below the spiral diverter and connected to the inner side of the storage tank. Meanwhile, each electrostatic adsorption electrode is connected in parallel and electrically connected to an electrostatic power supply. The electrostatic power supply is connected to the outer side of the storage tank, and the lifting drive mechanism, distance sensor and electrostatic power supply are all electrically connected to the drive circuit.

8. The method for grading carbon anode materials according to claim 7, characterized in that, The top of the flow guide shroud has a mounting hole coaxially distributed with it, and it covers the outside of the flow guide cone through the mounting hole and is coaxially distributed with the flow guide cone. The top and bottom of the flow guide cone extend at least 5 cm beyond the upper and lower end faces of the flow guide shroud. The outer diameter of the lower end face of the flow guide cone is 40%-80% of the outer diameter of the lower end face of the flow guide shroud. The upper end face of the flow guide cone is connected to the exhaust port through a flow guide pipe. The axis of the jet port forms an angle of 10°-45° with the upper end face of the flow guide shroud. The axis of each jet port intersects with the bottom of the flow guide channel. At the same time, each jet port is also connected to the air inlet through a flow guide pipe. The lower end face of the flow guide shroud is connected to at least one ranging sensor, and the axis of the ranging sensor is distributed parallel to the axis of the receiving tank.

9. A method for grading carbon anode materials according to claim 3, characterized in that, The drive circuit is a circuit system based on a programmable controller, and the drive circuit also has several serial communication ports.

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