High-purity aluminum powder briquetting recycling device and using method thereof

Abstract

The invention discloses a high-purity aluminum powder briquetting and recycling device, which relates to the technical field of aluminum powder recycling, and comprises a pressing unit, a feeding unit, a centrifugal fan and a storage unit, a discharging port of the material storage unit is communicated with a feeding port of the centrifugal fan through a material conveying pipe, a discharging port of the centrifugal fan is communicated with a feeding port of the feeding unit, and a discharging port of the feeding unit corresponds to a material pressing station of the material pressing unit. The material pressing unit comprises a downward pressing executing mechanism and a jacking discharging mechanism arranged under the downward pressing executing mechanism, and the problems that in the traditional direct furnace feeding and remelting recovery process, fine powder is extremely prone to floating on the surface of melt or suspending in furnace gas and cannot effectively settle into molten aluminum, and the molten aluminum cannot be effectively settled are solved. The invention provides the special briquetting recovery device and method capable of realizing low burning loss, high recovery rate and stable operation of the fine aluminum powder.

Description

Technical Field

[0001] This invention relates to the field of aluminum powder recycling technology, and in particular to a high-purity aluminum powder briquette recycling device and its usage method. Background Technology

[0002] High-purity aluminum powder (aluminum purity ≥ 99.99%) is a key raw material for producing composite three-dimensional electrode foils for high-end aluminum electrolytic capacitors. Its purity and physical properties directly affect the specific capacitance, mechanical strength, and reliability of the final electrode foil. During the preparation of aluminum powder (usually using atomization methods), due to process limitations, only a small amount of the product (e.g., particle size concentrated in the 3-6 micrometer range) meets the stringent requirements for electrode foil production. The yield of this usable powder is typically less than 25% of the total production. The majority of the remaining powder (e.g., particle size distribution in the 1-2 micrometer and 7-50 micrometer ranges) is unusable byproduct due to non-compliance with particle size standards.

[0003] These unusable high-purity aluminum powders still possess extremely high material value, and their efficient recycling and reuse are crucial for reducing production costs and improving resource utilization. However, due to the extremely fine particle size and large specific surface area of ​​aluminum powder, in traditional remelting and recycling processes, the fine powder easily floats on the surface of the melt or remains suspended in the furnace gas, failing to effectively settle into the molten aluminum, leading to severe oxidation and burn-off at high temperatures. Practice shows that the burn-off rate of this direct recycling method often exceeds 90%, resulting not only in extremely low recycling efficiency and resource waste but also potential safety and environmental hazards due to dust emissions.

[0004] Currently, although the recycling of aluminum powder briquettes is theoretically accepted, in actual industrial operations, there is still a lack of efficient and automated briquette recycling devices and corresponding optimized processes specifically designed for the characteristics of such ultrafine, high-purity aluminum powder. Existing general-purpose briquette equipment often suffers from problems such as severe dust dispersion, uneven pressing density, insufficient briquette strength, easy adhesion to molds, low production efficiency, and harsh operating environment, making it difficult to meet the production requirements of large-scale, continuous, and high-quality recycling. Therefore, developing a dedicated briquette recycling device and method that can effectively solve the above problems and achieve low burn-off, high recovery rate, and stable operation of fine aluminum powder has become an urgent technical need in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a high-purity aluminum powder briquetting recycling device and its usage method, which solves the problems mentioned in the background art.

[0006] This invention is implemented as follows: a high-purity aluminum powder briquetting recycling device includes a pressing unit, a feeding unit, a centrifugal fan, and a storage unit; the outlet of the storage unit is connected to the inlet of the centrifugal fan, the outlet of the centrifugal fan is connected to the inlet of the feeding unit through a conveying pipe, and the outlet of the feeding unit corresponds to the pressing station of the pressing unit; the pressing unit includes a pressing actuator and a lifting and discharging mechanism disposed directly below the pressing actuator.

[0007] A further technical solution of the present invention is: the pressing actuator includes a pressing frame, a vertical support is provided on the pressing frame, the pressing platform is slidably connected to the support, the upper surface of the pressing platform is connected to the output end of the main pressing cylinder installed at the top of the pressing frame, and a pressing head is provided on the bottom surface of the pressing platform.

[0008] A further technical solution of the present invention is: the top of the pressing machine frame is also provided with symmetrically distributed auxiliary pressing cylinders, and the output end of the auxiliary pressing cylinders is fixedly connected to the upper surface of the pressing platform.

[0009] A further technical solution of the present invention is: the lifting and discharging mechanism includes a base disposed at the bottom end of the pressing machine frame, at least two limiting rods are vertically disposed on the base, and the pressing cavity body is slidably connected to the limiting rods; the pressing cavity body has a pressing cavity that runs vertically through the center, and the pressing cavity is aligned vertically with the pressing head.

[0010] A further technical solution of the present invention is: a hydraulic cylinder is provided on the base, the output end of the hydraulic cylinder is connected to the bottom surface of the pressure chamber body, and is used to drive the pressure chamber body to move up and down along the limiting rod; a top head is also provided on the base, and the top end of the top head is placed inside the pressure chamber.

[0011] A further technical solution of the present invention is as follows: the feeding unit includes a feeding trough disposed on the pressure chamber body, a filter screen is provided at one end of the feeding trough, a storage box is provided directly below the filter screen, the other end of the feeding trough extends to the outside of the pressure unit, and a through hole adapted to the pressure chamber is also provided in the middle of the feeding trough; arc-shaped slides are provided on both sides of the feeding trough, and a feeding hopper is also provided inside the feeding trough, the feeding hopper being slidably connected to the feeding trough through a sliding mechanism.

[0012] A further technical solution of the present invention is: the sliding mechanism includes an arc-shaped slide rail disposed on both sides of the feeding trough, a connecting frame fixed to the front end of the feeding hopper and sliders at both ends adapted to the arc-shaped slide rail; the front end of the feeding hopper is also provided with a U-shaped pusher frame, the inner side of the pusher frame is provided with symmetrically distributed nozzles, the interior of the feeding hopper has an inclined surface that slopes downward toward its discharge direction, and the end of the inclined surface is connected to a vertically downward discharge port.

[0013] A further technical solution of the present invention is: the feeding unit further includes an intermediate material box, which is positioned directly above the feeding hopper via a suspension mounted on the top of the pressing machine frame; the bottom of the intermediate material box is provided with a solenoid valve for controlling the feeding and a metering device for quantitative feeding in sequence; the feeding unit further includes a mounting frame and an electric push rod, the mounting frame is mounted on one side of the pressing chamber body, and the electric push rod is located at the end of the mounting frame away from the pressing chamber body, and its output end is connected to the end face of the feeding hopper.

[0014] A further technical solution of the present invention is as follows: the storage unit includes a material preparation box, and a dust removal device is provided inside the material preparation box; an upper discharge valve and a lower discharge valve are provided at the bottom outlet of the material preparation box, and at least three magnetic separation rollers are provided in the cavity between the upper discharge valve and the lower discharge valve, and the axes of the multiple magnetic separation rollers are arranged in a triangular shape in space; a storage bin is provided below the lower discharge valve, and a discharge pipe is provided at the bottom end of the storage bin; the magnetic separation rollers are driven by a motor provided on the outer wall of the material preparation box.

[0015] A method for using a high-purity aluminum powder briquette recycling device includes the following steps: S1. Material preparation and iron removal: The ton bag containing high-purity aluminum powder is hoisted to the top of the material preparation box and the bottom opening is opened to allow the aluminum powder to fall into the material preparation box. At the same time, the dust collector is started to absorb the dust. Then the material preparation box is closed and the magnetic separation roller in the storage unit is started to rotate under magnetic flux and nitrogen is introduced. The lower discharge valve and the upper discharge valve of the material preparation box are opened in sequence so that the aluminum powder is magnetically separated by the magnetic separation roller to remove iron. Then, it is drawn by the centrifugal fan through the conveying pipe to the intermediate material box of the feeding unit for storage. S2. Automatic pressing and molding: Start the briquetting program and automatically execute the following processes: S21. Feeding and feeding: Open the solenoid valve at the bottom of the intermediate material box. The aluminum powder is weighed by the metering device and falls into the feeding hopper. The electric push rod pushes the feeding hopper to move forward along the arc-shaped slide. S22, Spraying release agent: When the feeding hopper moves to the first station, it pauses and sprays the release agent into the pressure chamber of the pressing unit through the nozzle at its front end; S23. Aluminum powder filling: After the spraying is completed, the feeding hopper continues to move forward to the second station, so that its discharge port is aligned with the pressure chamber; open the discharge port and a metered amount of aluminum powder falls into the pressure chamber; S24. Pressing: The feeding hopper retracts to the waiting position; the main pressing cylinder of the pressing unit drives the pressing head to press down quickly, and when it approaches the upper plane of the pressing chamber, it switches to slow pressing to press the aluminum powder into blocks. The pressing pressure is 8-12 MPa. The pressing process includes two pressure holdings: after the first pressure is reached, the pressure is held for about 1 second, and the pressing head retracts 10 mm to release air. Then the second pressing is performed, and after the pressure is reached, the pressure is held for about 1 second. Finally, the pressing head retracts completely. S3. Press Block Pushing and Collection: After pressing and forming, the hydraulic cylinder of the lifting and discharging mechanism drives the main body of the pressing chamber to move down, so that the aluminum press block is exposed on the upper surface of the main body of the pressing chamber; the feeding hopper moves forward again, pushing the press block and loose material into the front end of the feeding trough; the press block is removed manually, and the loose material falls into the collection box below through the filter screen for recycling. S4. Cleaning and maintenance: After the briquetting operation is completed, regularly clean the impurities adsorbed on the surface of the magnetic separation roller in the storage unit.

[0016] The beneficial effects of this invention are: 1. The core advantage of this invention lies in the construction of a fully automated, fully enclosed high-purity aluminum powder recycling and briquetting system. By integrating and connecting the pressing, feeding, pneumatic conveying, and storage units, continuous operation from aluminum powder recycling to briquetting is achieved. This system not only significantly improves production efficiency but also fundamentally solves the problem of dust emission during the production process through the cooperation of pipelines and enclosed units, ensuring a safe working environment and the health of operators.

[0017] 2. In the actual production process, the pressing unit uses main and auxiliary hydraulic cylinders to apply pressure in tandem, ensuring uniform pressing force and forming dense, high-quality blocks of aluminum powder. Its unique lifting and discharging mechanism enables smooth demolding of the pressed blocks and automatic collection and cleaning of excess powder. At the same time, the feeding unit uses quantitative feeding and precise positioning by electric push rods, combined with pneumatic auxiliary design, to effectively suppress dust and assist in material pre-compactment while accurately feeding materials.

[0018] 3. This invention also includes a storage unit that integrates dust removal and multi-stage magnetic separation functions, effectively removing fine dust and magnetic impurities from aluminum powder. Combined with a controllable discharge valve, this system forms a highly efficient material purification cycle, ensuring the high purity of the recycled briquetted product. It is particularly suitable for high-purity aluminum powder recycling scenarios with stringent requirements for cleanliness and quality. Attached Figure Description

[0019] Figure 1 This is an overall structural diagram of the present invention; Figure 2 This is a front view of the present invention; Figure 3 This is a schematic diagram of the material pressing unit in this invention; Figure 4 This is a schematic diagram of the feeding unit in this invention; Figure 5 This is a partially enlarged schematic diagram of point A in the present invention; Figure 6 This is a schematic diagram of the installation of the intermediate material box in this invention; Figure 7 This is a cross-sectional structural diagram of the storage unit in this invention.

[0020] Reference numerals: 1. Pressing unit; 11. Pressing frame; 12. Base; 13. Support column; 14. Pressing platform; 15. Main pressing cylinder; 16. Auxiliary pressing cylinder; 17. Pressing head; 18. Limiting rod; 19. Pressing chamber body; 101. Pressing chamber; 102. Hydraulic cylinder; 103. Top head; 2. Feeding unit; 21. Feeding trough; 22. Feeding hopper; 23. Mounting frame; 24. Electric actuator; 25. Slider; 26. Arc-shaped slide rail 27. Pusher rack; 28. Nozzle; 29. ​​Connecting frame; 201. Filter screen; 202. Storage box; 203. Suspension; 204. Intermediate material box; 205. Solenoid valve; 206. Meter; 3. Centrifugal fan; 4. Storage unit; 41. Material preparation box; 42. Motor; 43. Discharge pipe; 44. Magnetic separator roller; 45. Storage silo; 46. Dust collector; 47. Upper discharge valve; 48. Lower discharge valve; 5. Conveying pipe. Detailed Implementation

[0021] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0022] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding and reading. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0023] Please refer to the detailed information. Figures 1 to 6 This invention provides a high-purity aluminum powder briquetting and recycling device, which is mainly used for the automated recycling and purification of high-purity aluminum powder and the pressing into high-density blocks to realize the recycling of resources and fundamentally improve the combustion risk and oxidation loss when aluminum powder is directly remelted.

[0024] like Figure 1As shown, the entire device includes a storage unit 4, a centrifugal fan 3, a feeding unit 2 and a pressing unit 1 in sequence along the material handling process. The units are closely connected by pipes or mechanical structures to form a closed-loop or semi-closed-loop automated system.

[0025] Among them, the pressing unit 1 is a key component for pressing recycled aluminum powder into shape, which compacts loose aluminum powder into high-density blocks, significantly reducing the specific surface area during subsequent remelting, thereby reducing oxidation loss. Feeding unit 2 is responsible for accurately and dust-free conveying the purified aluminum powder to the pressing station of pressing unit 1; Storage unit 4 is used to store aluminum powder and perform preliminary iron removal and purification; Centrifugal fan 3 serves as the power source for pneumatic conveying, transporting aluminum powder from storage unit 4 to feeding unit 2 via conveying pipe 5. The entire process takes place in a closed pipeline, avoiding dust and oxidation.

[0026] like Figures 1 to 4 As shown, the pressing unit 1 is the core part for completing the aluminum powder compaction and forming, including the pressing actuator and the lifting and discharging mechanism.

[0027] like Figure 3 As shown, the pressing actuator includes a robust pressing frame 11. A main pressing cylinder 15 is mounted at the top center of the pressing frame 11, and two auxiliary pressing cylinders 16 are symmetrically mounted on both sides. Vertical support columns 13 are provided at the four corners of the pressing frame 11. A pressing platform 14 is slidably connected to these support columns 13 via components such as linear bearings, allowing it to move smoothly up and down along the support columns 13. The piston rod output ends of the main pressing cylinder 15 and the two auxiliary pressing cylinders 16 are fixedly connected to the upper surface of the pressing platform 14, jointly driving its lifting and lowering. A detachable pressing head 17 is mounted at the bottom center of the pressing platform 14.

[0028] Both the main pressing cylinder 15 and the auxiliary pressing cylinder 16 are driven by an externally connected hydraulic station.

[0029] like Figure 4 As shown, the lifting and discharging mechanism is located at the bottom of the pressing machine frame 11. A base 12 is fixed below the pressing machine frame 11, and at least two limiting rods 18 are vertically fixed on the base 12. A pressing chamber body 19 is slidably connected to the limiting rods 18 via a sliding sleeve. A cylindrical pressing chamber 101 with vertical penetration is opened in the center of the pressing chamber body 19. The size of the pressing chamber 101 matches the pressing head 17, and the chambers are aligned vertically. A hydraulic cylinder 102 is installed on the base 12, and its piston rod is connected upward to the bottom surface of the pressing chamber body 19 to drive the pressing chamber body 19 to rise and fall along the limiting rods 18. Inside the pressing chamber 101, a top head 103 is fixed on the base 12, and its top end can extend into the lower part of the pressing chamber 101.

[0030] like Figure 5 As shown, the feeding unit 2 is responsible for accurately and dust-free conveying aluminum powder to the pressing station. It includes a feeding trough 21, and a feeding hopper 22 is slidably connected to the feeding trough 21 via a sliding mechanism.

[0031] The internal structure of the feeding hopper 22 is as follows: its bottom plate is a slope that is lower in the front and higher in the back, and the end of the slope is connected to a vertically downward funnel-shaped discharge port.

[0032] Preferably, the sliding mechanism includes arc-shaped slides 26 disposed on both sides of the feeding trough 21, a connecting frame 29 fixed to the front end of the feeding hopper 22, and sliders 25 at both ends adapted to the arc-shaped slides 26.

[0033] The feeding trough 21 is fixedly installed on the upper surface of the pressure chamber body 19 to restrict the travel direction of the feeding hopper 22. One end of the feeding trough 21 is provided with a filter screen 201, and a storage box 202 is provided directly below the filter screen 201. The other end of the feeding trough 21 extends horizontally to the outside of the pressure unit 1.

[0034] Preferably, the storage box 202 is detachably installed on the pressure chamber body 19, and its top surface should be flush with the upper surface of the pressure chamber body 19. After the aluminum powder is pressed into shape, a certain amount of loose powder will remain. The function of the storage box is to collect the loose powder. Therefore, the storage box 202 should be placed directly below the filter screen 201 and should be easy to disassemble and assemble.

[0035] like Figure 4 As shown, the sliding of the feeding hopper 22 is driven by the electric push rod 24. The electric push rod 24 is installed on one side of the pressure chamber body 19 through the mounting bracket 23, and the output end of the electric push rod 24 is fixedly connected to the end face of the feeding hopper 22.

[0036] like Figure 5 As shown, a pusher 27 is provided at the front end of the feeding hopper 22. The pusher 27 is a component that directly contacts the pressed aluminum block. After the aluminum block is pressed into shape, the electric push rod 24 pushes the feeding hopper 22 to slide along the feeding groove 21. At this time, the pusher 27 will push the aluminum block and residual loose powder to the position of the filter screen 201 for unloading.

[0037] Preferably, two symmetrically distributed nozzles 28 are provided on the inner side of the pusher frame 27, and the release agent is sprayed from the nozzles 28 into the interior of the pressure chamber 201 by nitrogen gas.

[0038] A middle material box 204 is fixed above the feeding hopper 22 via a suspension 203. A solenoid valve 205 and a metering device 206 are connected sequentially to the bottom outlet of the middle material box 204 to control the weight of each feeding. The top of the middle material box 204 is connected to the conveying pipe 5, through which the centrifugal fan 3 transfers aluminum powder from the storage unit 4 to the middle material box 204.

[0039] like Figure 6 As shown, the storage unit 4 is used to store and purify raw aluminum powder. Its main body is a sealed preparation box 41, with a dust removal device 46 installed at the top to collect dust generated during feeding. The bottom of the preparation box 41 has an outlet pipe, on which an upper discharge valve 47 and a lower discharge valve 48 are installed sequentially from top to bottom. Three magnetic separation rollers 44 are installed in the cavity between the two valves, driven synchronously by a motor 42 mounted on the outer wall of the preparation box 41 via a transmission mechanism. A storage silo 45 is connected below the lower discharge valve 48, and a discharge pipe 43 is located at the bottom of the storage silo 45.

[0040] The magnetic separator 44 has a spiral toothed surface and a diameter 0.2 times the outlet diameter. It is installed in two layers: one in the center of the upper layer and two in the lower layer. The positions and spacing of the rollers form an equilateral triangle with the upper roller. Nitrogen gas is introduced through the surface of the magnetic separator 44. When the feed hopper is ready to discharge powder, the magnetic separator 44 is first activated and rotated. After a 3-second delay, the lower discharge valve is opened first, followed by the upper discharge valve. The aluminum powder passes through the magnetic separator 44 and falls into the storage hopper 45. At this time, the iron particles in the aluminum powder are adsorbed by the magnetic separator 44. After quantitative powder discharge, the upper discharge valve is closed, and this operation is repeated until all the aluminum powder in the feed hopper 41 is discharged.

[0041] like Figure 2 As shown, the discharge pipe 43 is connected to the inlet of the centrifugal fan 3. The discharge port of the centrifugal fan 3 is connected to the inlet of the intermediate material box 204 of the feeding unit 2 through another pipe, thus forming a pneumatic conveying system to transport the aluminum powder in the storage bin 45 to the intermediate material box 204.

[0042] A method for using a high-purity aluminum powder briquette recycling device includes the following steps: Material preparation and iron removal: The ton bag containing high-purity aluminum powder is hoisted above the preparation box and the bottom opening is opened, allowing the aluminum powder to fall into the preparation box 41. At the same time, the dust collector 46 is activated to absorb dust and prevent the risk of dust explosion. Then, the preparation box 41 is closed and the magnetic separation roller 44 in the storage unit 4 is activated to rotate under magnetic flux and nitrogen gas is introduced. The lower discharge valve 47 and the upper discharge valve 48 of the preparation box 41 are opened in sequence, allowing the aluminum powder to pass through the magnetic separation roller 44 to remove iron. The purified aluminum powder then falls into the storage silo 45. This step significantly reduces the iron impurity content in the aluminum powder, avoids the contamination of high-purity aluminum by iron elements during remelting, and eliminates the hidden danger of iron friction ignition.

[0043] The aluminum powder in the storage bin 45 is transported to the intermediate material box 204 of the feeding unit 2 via the centrifugal fan 3 and the conveying pipe 5. During this process, the aluminum powder is transported through pipelines, which eliminates contact between the aluminum powder and the air and reduces oxidation loss.

[0044] Automatic pressing and molding: Start the briquetting program and automatically execute the following processes: 1. Feeding and feeding: Open the solenoid valve 205 at the bottom of the intermediate material box 204. After the aluminum powder is weighed by the metering device 206, it falls into the feeding hopper 22; the electric push rod 26 pushes the feeding hopper 22 to move forward along the slide rail assembly 23. 2. Spraying release agent: When the feeding hopper 22 moves to the first station, it is paused, and the release agent is sprayed into the pressure chamber 101 from the nozzle 28 at its front end by nitrogen gas; 3. Aluminum powder filling: After the spraying is completed, the feeding hopper 22 continues to move forward to the second station, so that its discharge port is aligned with the pressure chamber 101; the discharge port is opened and a metered amount of aluminum powder falls into the pressure chamber 101; 4. Pressing: The feeding hopper 22 retracts to the waiting position; the main pressing cylinder 15 of the pressing unit 1 drives the pressing head 17 to press down quickly, and when it approaches the upper surface of the pressing chamber 101, it switches to slow pressing to press the aluminum powder into blocks. The pressing pressure is 8-12 MPa. The pressing process includes two pressure holdings: after the first pressure is reached, the pressure is held for about 1 second, and the pressing head 17 retracts 10 mm to release air. Then, the second pressing is performed, and after the pressure is reached, the pressure is held for about 1 second. Finally, the pressing head 17 retracts completely. The two pressure holdings can effectively reduce the porosity inside the blocks and increase their density, which greatly reduces the oxidation loss rate during subsequent remelting (more than 50% lower than direct remelting of powder).

[0045] Press block ejection and collection: After pressing and forming, the hydraulic cylinder 102 of the lifting and discharging mechanism drives the pressing chamber body 19 to move down, so that the aluminum pressing block is exposed on the upper surface of the pressing chamber body 19; the feeding hopper 22 moves forward again, pushing the pressing block and loose material into the feeding trough 21; the pressing block is pushed to the front end of the trough and is removed manually, while the loose material falls into the collection box 202 below through the filter screen 201 for recycling; Cleaning and maintenance: After the briquetting operation is completed, the impurities adsorbed on the surface of the magnetic separation roller 44 in the storage unit 4 should be cleaned regularly.

[0046] The working principle of the above embodiments is as follows: This high-purity aluminum powder briquetting and recycling device is an automated closed-loop process integrating material purification, automatic conveying, precision pressing, and finished product collection. Its core lies in the precise coordination of various functional units to efficiently and cleanly transform loose high-purity aluminum powder into high-density briquettes, while strictly controlling impurities and dust throughout the process.

[0047] First, during system startup, the device is in the material preparation and purification stage. A ton bag containing the high-purity aluminum powder to be recycled is hoisted above the preparation box 41 of storage unit 4 using a hook. The bag opening is then opened, and the aluminum powder falls into the preparation box 41, where a dust collector 46 removes fine dust. Subsequently, the aluminum powder flows under gravity through a set of high-speed rotating magnetic separators 44, where magnetic impurities are strongly adsorbed and removed, completing the crucial iron removal and purification step. The purified aluminum powder is stored in the storage silo 45 and, using the pneumatic force generated by the centrifugal fan 3, is stably conveyed through the conveying pipe 5 to the intermediate material box 204 of feeding unit 2 for later use.

[0048] The process then proceeds to the precision feeding and pressing stage. A metering device 206 at the bottom of the intermediate material hopper 204 precisely weighs a portion of aluminum powder and releases it into the movable feeding hopper 22. The feeding hopper 22 moves along a slide rail, first briefly pausing above the pressing chamber 101, where nitrogen gas is used to spray a release agent from the nozzle 28 at its front end into the pressing chamber 101. Then, it precisely positions and injects the aluminum powder into the cylindrical pressing chamber 101 of the pressing unit 1. Under the synchronous drive of the main and auxiliary hydraulic cylinders, the pressing head 17 pressurizes and holds the aluminum powder, forming a dense block. This process may include an venting stroke to ensure the internal quality of the pressed block.

[0049] Finally, there is the stage of block demolding and material circulation. After pressing, the press head 17 is raised, and the lifting and discharging mechanism is activated: the hydraulic cylinder 102 drives the main body 19 of the pressing chamber to descend, at which time the fixed top head 103 smoothly ejects the formed aluminum block from the cavity. The feeding hopper 22 moves forward again, pushing the aluminum block and residual powder on the surface into the feeding trough 21. The aluminum block is collected, and the scattered residual powder falls into the collection box 202 through the filter screen 201. All the loose material generated in the process can be recovered to the storage unit 4 through the negative pressure of the system and re-enter the purification and pressing cycle, thereby realizing the efficient utilization of materials and the clean control of the production environment.

[0050] This invention fundamentally solves two major problems associated with the direct remelting of high-purity aluminum powder in powder form: high safety risks and severe oxidation loss. The solution is not a single-step improvement, but rather an integrated process and apparatus that transforms loose aluminum powder into dense briquettes, while controlling the environment throughout the process, thereby achieving both safety and high efficiency.

[0051] To address safety concerns, this invention employs a multi-layered control system from source to end. First, raw materials undergo powerful magnetic separation immediately upon entering the system, effectively removing ferrous impurities that could potentially cause sparks and combustion. Second, the aluminum powder is transported entirely through pneumatic processes within a closed pipeline, combined with a dust removal device, completely preventing the diffusion and accumulation of dust in the air and eliminating the preconditions for a dust explosion.

[0052] To address the issue of oxidation loss, this invention significantly reduces oxidation primarily by altering the physical morphology of aluminum and controlling its processing environment. The core technology involves pressing fine aluminum powder, hundreds of times larger than the surface area of ​​the block, into a high-density, low-porosity solid block under high pressure. This drastically reduces the contact area between the metal and air during subsequent remelting, naturally leading to a significant decrease in the oxidation rate. Simultaneously, the system employs closed or inert gas protection measures throughout multiple stages, from storage and transportation to pressing, cutting off the pathway for continuous reaction between aluminum and oxygen, thus controlling oxidation loss to an extremely low level. Furthermore, the unique pressing process involving two pressure holding and venting operations further ensures the density of the pressed block, while the automatic recovery design for loose powder improves the overall metal yield.

[0053] In summary, this invention, through a synergistic technical approach of "impurity removal and explosion prevention, airtight inerting, and compaction molding," not only makes the recycling and processing of high-risk aluminum powder safe and controllable, but also significantly improves its economic efficiency due to the substantial reduction in burn-off, providing a reliable and efficient solution for the recycling of high-purity aluminum powder.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-purity aluminum powder briquette recycling device, characterized in that: It includes a pressing unit (1), a feeding unit (2), a centrifugal fan (3), and a storage unit (4); the outlet of the storage unit (4) is connected to the inlet of the centrifugal fan (3), the outlet of the centrifugal fan (3) is connected to the inlet of the feeding unit (2) through a conveying pipe (5), and the outlet of the feeding unit (2) corresponds to the pressing station of the pressing unit (1); the pressing unit (1) includes a pressing actuator and a lifting discharge mechanism located directly below the pressing actuator.

2. The high-purity aluminum powder briquette recycling device according to claim 1, characterized in that, The pressing actuator includes a pressing frame (11), on which a vertical support column (13) is provided. The pressing platform (14) is slidably connected to the support column (13). The upper surface of the pressing platform (14) is connected to the output end of the main pressing cylinder (15) installed at the top of the pressing frame (11). The bottom surface of the pressing platform (14) is provided with a pressing head (17).

3. The high-purity aluminum powder briquette recycling device according to claim 2, characterized in that, The top of the pressing machine frame (11) is also provided with symmetrically distributed auxiliary pressing cylinders (16), and the output end of the auxiliary pressing cylinders (16) is fixedly connected to the upper surface of the pressing platform (14).

4. The high-purity aluminum powder briquetting recycling device according to claim 3, characterized in that, The lifting and discharging mechanism includes a base (12) at the bottom of the pressing frame (11), at least two limiting rods (18) are vertically arranged on the base (12), and the pressing chamber body (19) is slidably connected to the limiting rods (18); the pressing chamber body (19) has a pressing chamber (101) that runs vertically through the center, and the pressing chamber (101) is aligned vertically with the pressing head (17).

5. The high-purity aluminum powder briquette recycling device according to claim 4, characterized in that, The base (12) is provided with a hydraulic cylinder (102), the output end of which is connected to the bottom surface of the pressure chamber body (19) and is used to drive the pressure chamber body (19) to rise and fall along the limiting rod (18); the base (12) is also provided with a top head (103), the top of which is placed inside the pressure chamber (101).

6. The high-purity aluminum powder briquetting recycling device according to claim 5, characterized in that, The feeding unit (2) includes a feeding trough (21) on the pressure chamber body (19). One end of the feeding trough (21) is provided with a filter screen (201), and a storage box (202) is provided directly below the filter screen (201). The other end of the feeding trough (21) extends to the outside of the pressure unit (1). The middle position of the feeding trough (21) is also provided with a through hole that is compatible with the pressure chamber (101). Arc-shaped slides (26) are provided on both sides of the feeding trough (21). A feeding hopper (22) is also provided inside the feeding trough (21). The feeding hopper (22) is slidably connected to the feeding trough (21) through a sliding mechanism.

7. The high-purity aluminum powder briquette recycling device according to claim 6, characterized in that, The sliding mechanism includes an arc-shaped slide (26) on both sides of the feeding trough (21), a connecting frame (29) fixed to the front end of the feeding hopper (22) and a slider (25) at both ends that are adapted to the arc-shaped slide (26); the front end of the feeding hopper (24) is also provided with a U-shaped pusher frame (27), the inner side of the pusher frame (27) is provided with symmetrically distributed nozzles (28), the interior of the feeding hopper (22) has an inclined surface that slopes downward toward its discharge direction, and the end of the inclined surface is connected to a vertically downward discharge port.

8. The high-purity aluminum powder briquette recycling device according to claim 6, characterized in that, The feeding unit (2) also includes an intermediate material box (204), which is positioned directly above the feeding hopper (22) via a suspension (203) at the top of the pressing machine frame (11). The bottom of the intermediate material box (204) is provided with a solenoid valve (205) for controlling the feeding and a metering device (206) for quantitative feeding. The feeding unit (2) also includes a mounting frame (23) and an electric push rod (24). The mounting frame (23) is located on one side of the pressing chamber body (19), and the electric push rod (24) is located at the end of the mounting frame (23) away from the pressing chamber body (19), and its output end is connected to the end face of the feeding hopper (22).

9. The high-purity aluminum powder briquette recycling device according to claim 1, characterized in that, The storage unit (4) includes a material preparation box (41), and a dust removal device (46) is provided inside the material preparation box (41). An upper discharge valve (47) and a lower discharge valve (48) are provided at the bottom outlet of the material preparation box (41). At least three magnetic separation rollers (44) are provided in the cavity between the upper discharge valve (47) and the lower discharge valve (48). The axes of the multiple magnetic separation rollers (44) are arranged in a triangular shape in space. A storage bin (45) is provided below the lower discharge valve. A discharge pipe (43) is provided at the bottom end of the storage bin (45). The magnetic separation rollers (44) are driven by a motor (42) provided on the outer wall of the material preparation box (41).

10. A method of using the high-purity aluminum powder briquetting recycling device as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Material preparation and iron removal: The ton bag containing high-purity aluminum powder is hoisted to the top of the material preparation box and the bottom opening is opened so that the aluminum powder falls into the material preparation box (41). At the same time, the dust collector (26) is started to adsorb the dust. Then the material preparation box (41) is closed and the magnetic separation roller (44) in the storage unit (4) is started to rotate with magnetic flux and nitrogen is introduced. The lower discharge valve (47) and the upper discharge valve (48) of the material preparation box (41) are opened in sequence so that the aluminum powder is magnetically separated and iron removed by the magnetic separation roller (44) and then sucked by the centrifugal fan (3) through the conveying pipe (5) to the intermediate material box (204) of the feeding unit (2) for storage. S2. Automatic pressing and molding: Start the briquetting program and automatically execute the following processes: S21. Feeding and feeding: Open the solenoid valve (205) at the bottom of the intermediate material box (204). The aluminum powder is weighed by the metering device (206) and falls into the feeding hopper (22). The electric push rod (24) pushes the feeding hopper (22) to move forward along the arc-shaped slide (26). S22, Spraying release agent: When the feeding hopper (22) moves to the first station, it stops and sprays the release agent into the pressure chamber (101) in the pressing unit (1) through the nozzle (28) at its front end; S23, Aluminum powder filling: After the spraying is completed, the feeding hopper (22) continues to move forward to the second station, so that its discharge port is aligned with the pressure chamber (101); the discharge port is opened and a certain amount of aluminum powder falls into the pressure chamber (101). S24, Pressing: The feeding hopper (22) retracts to the waiting position; the main pressing cylinder (15) of the pressing unit (1) drives the pressing head (17) to press down quickly. When it approaches the upper surface of the pressing chamber (101), it switches to slow pressing to press the aluminum powder into blocks. The pressing pressure is 8-12 MPa. The pressing process includes two pressure holdings: after the first pressure is reached, the pressure is held for about 1 second, and the pressing head (17) retracts 10 mm to release the air. Then the second pressing is carried out. After the pressure is reached, the pressure is held for about 1 second. Finally, the pressing head (17) retracts completely. S3, Press Block Pushing and Collection: After pressing and forming, the hydraulic cylinder (102) of the lifting and discharging mechanism drives the pressing chamber body (19) to move down, so that the aluminum pressing block is exposed to the upper surface of the pressing chamber body (19); the feeding hopper (22) moves forward again, pushing the pressing block and loose material into the front end of the feeding trough (21); The briquettes are removed manually, while the loose material falls through the filter screen (201) into the collection box (202) below for recycling; S4. Cleaning and maintenance: After the briquetting operation is completed, the impurities adsorbed on the surface of the magnetic separation roller (44) in the storage unit (4) should be cleaned regularly.

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