Electrolytic aluminum solid waste grading aluminum extraction device

Abstract

The utility model relates to a kind of electrolytic aluminium solid waste grading aluminium extraction device, including crusher etc., the outlet of crusher is connected between the import of ball mill by first conveying unit, the outlet of ball mill is connected between the import of horizontal rotary drum screen classifier by second conveying unit, primary screen, secondary screen, tertiary screen are located in horizontal rotary drum screen classifier, primary screen, secondary screen, tertiary screen are sequentially arranged outward along the central shaft of horizontal rotary drum screen classifier, the screen mesh aperture of primary screen is greater than the screen mesh aperture of secondary screen, the screen mesh aperture of secondary screen is greater than the screen mesh aperture of tertiary screen, the screen mesh aperture of primary screen is greater than the screen mesh aperture of secondary screen, the screen mesh aperture of secondary screen is greater than the screen mesh aperture of tertiary screen, the lower surface of primary screen, the lower surface of secondary screen, the lower surface of tertiary screen are equipped with multiple material lifting plates.The utility model improves aluminium recovery efficiency by crushing, ball milling, three-stage screening, dust removal and other means, reduces resource waste, and concentrates dust treatment, prevents dust from flowing out to the outside world, and protects the health of operating personnel and the environment.

Description

Technical Field

[0001] This utility model relates to an aluminum extraction device, specifically to a graded aluminum extraction device for electrolytic aluminum solid waste. Background Technology

[0002] With the rapid development of the aluminum industry, the amount of electrolytic aluminum solid waste (including carbon slag, overhaul slag, and aluminum ash) generated is increasing year by year. However, its composition is complex, containing aluminum particles and various impurities. Due to limitations in the electrolysis process, electrolytic aluminum solid waste generally contains a certain amount of pure aluminum particles. The content of aluminum particles in electrolytic aluminum solid waste varies from 5% to 30% depending on the electrolysis process of different electrolysis plants. If not effectively recycled, it not only wastes metal resources, but the soluble fluorides, aluminum nitride, and other components will also pollute soil and water sources. As an important metal resource, aluminum, by adopting appropriate technical methods to recover aluminum particles from electrolytic aluminum solid waste, not only has significant economic value, but also conforms to the circular economy and the "zero waste" concept, promoting resource conservation.

[0003] Traditional processes for recycling aluminum granules include pyrometallurgical smelting, hydrometallurgical leaching, and mechanical screening. Pyrometallurgical smelting suffers from high energy consumption and high aluminum oxidation loss rates; hydrometallurgical leaching uses acid or alkaline solutions, resulting in high reagent consumption, generating fluoride-containing wastewater, and causing severe equipment corrosion; mechanical screening involves larger particles that clog the screens, requiring shutdown for cleaning and reducing separation efficiency. Furthermore, grinding and mechanical screening generate large amounts of dust that are directly released into the air, causing air pollution and harming the health of operators and the surrounding environment. Utility Model Content

[0004] To address the aforementioned problems in the existing technology, this utility model provides a graded aluminum extraction device for electrolytic aluminum solid waste.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a graded aluminum extraction device for electrolytic aluminum solid waste, comprising a crusher, a first conveying unit, a ball mill, a second conveying unit, a horizontal rotary drum screen, a primary screen, a secondary screen, a tertiary screen, lifting plates, a closed negative pressure dust removal mechanism, a first negative pressure pipeline, and a second negative pressure pipeline. The outlet of the crusher is connected to the inlet of the ball mill through the first conveying unit, and the outlet of the ball mill is connected to the inlet of the horizontal rotary drum screen through the second conveying unit. The primary screen and the secondary screen... The three screens are all located inside the horizontal rotary drum screen. The primary, secondary, and tertiary screens are arranged outwards along the central axis of the horizontal rotary drum screen. The screen aperture of the primary screen is larger than that of the secondary screen, and the screen aperture of the secondary screen is larger than that of the tertiary screen. Multiple lifting plates are installed below the primary, secondary, and tertiary screens. The inlet of the crusher and the closed negative pressure dust removal mechanism are connected through the first negative pressure pipe, and the ball mill and the inlet of the closed negative pressure dust removal mechanism are connected through the second negative pressure pipe.

[0006] According to one embodiment of the present invention, the ball mill is equipped with a plurality of steel balls of different diameters.

[0007] According to one embodiment of the present invention, the closed negative pressure dust removal mechanism includes a bag filter, an induced draft fan, a dust hopper, and an induced draft duct. The bag filter and the induced draft fan are connected through the induced draft duct, and the dust hopper is located below the bag filter.

[0008] According to one embodiment of the present invention, a filter plate is provided in the bottom cavity of the induced draft fan, and a cleaning brush is provided on the filter plate, which is connected to multiple connecting rods.

[0009] According to one embodiment of the present invention, the crusher is a jaw crusher.

[0010] According to one embodiment of the present invention, at least one magnet is provided on the side of the first conveying unit.

[0011] According to one embodiment of the present invention, the ball mill is provided with an inspection door for maintenance and an observation window for observation on one side, with the observation window located on one side of the inspection door.

[0012] According to one embodiment of the present invention, the primary screen is connected to a first aluminum particle collection unit through a first discharge pipe, the secondary screen is connected to a second aluminum particle collection unit through a second discharge pipe, the tertiary screen is connected to a third aluminum particle collection unit through a third discharge pipe, and the end of the horizontal rotary drum screen is connected to a fourth aluminum particle collection unit through a fourth discharge pipe. The first, second, third, and fourth aluminum particle collection units are all aluminum particle collection bins or aluminum particle collection bags.

[0013] According to one embodiment of the present invention, both the first conveying unit and the second conveying unit are conveyor belts, and the conveyor belts are provided with a sealing cover.

[0014] Compared with the prior art, the present invention has at least the following advantages: This invention utilizes a crusher to pre-treat and break up large pieces of electrolytic aluminum solid waste, removing agglomerates and providing uniform raw materials for subsequent grinding processes. This reduces grinding dead zones in the ball mill, shortens subsequent fine crushing time, and prevents subsequent screen clogging. The material is conveyed to a ball mill via a first conveying unit, where it undergoes fine grinding to fully separate aluminum particles from the oxide matrix and prevent over-grinding. Afterward, it is conveyed to a horizontal rotary drum screen via a second conveying unit. The horizontal rotary drum screen uses primary, secondary, and tertiary screens to separate aluminum particles of different sizes for use in smelting furnaces, refining agents, and water treatment agents, among other resource utilization pathways. The three-stage screening of different particle sizes significantly reduces the aluminum particle rate, greatly improves aluminum recovery efficiency, and reduces resource waste. Simultaneously, the fine aluminum powder collected by the closed negative pressure dust removal mechanism can be baled by a baler for recycling, ultimately achieving efficient separation and full utilization of aluminum particles in electrolytic aluminum solid waste.

[0015] Second, this utility model is equipped with a closed negative pressure dust removal mechanism, which includes a bag filter, an induced draft fan, a dust hopper, and an induced draft duct, so that dust is actively sucked into the bag filter for treatment, which greatly improves dust collection efficiency and reduces the impact on the environment and personnel.

[0016] Third, a filter plate is installed in the bottom cavity of the induced draft fan. A cleaning brush is installed on the filter plate and connected to multiple connecting rods. The cleaning brush can directly act on the surface of the filter plate. Pulling the connecting rods moves the cleaning brush back and forth, thereby cleaning the filter plate. The dust attached to the filter plate is removed by mechanical cleaning, maintaining the permeability and performance of the filter plate. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 This is a schematic diagram of the structure of the electrolytic aluminum solid waste graded aluminum extraction device of this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of components such as the filter plate and cleaning brush in this utility model. Detailed Implementation

[0020] In view of the shortcomings of the prior art, the inventor of this utility model has, through long-term research and extensive practice, proposed the technical solution of this utility model. The following will further explain and illustrate the technical solution, its implementation process, and its principles in conjunction with the accompanying drawings and specific implementation examples.

[0021] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. The described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, the present invention covers any substitutions, modifications, equivalent methods and solutions made within the spirit, principles and scope of the present invention as defined by the claims. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this application, the terms "first," "second," "third," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," and similar words, do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including," and similar words, mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. The terms "connected" or "linked," and similar words, are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0023] In the description of this application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, when using positional terms such as "both sides," "outer side," and "upper and lower," it should be understood that they are used only for ease of understanding and description, taking into account that the structure may be oriented to other positions.

[0024] In the description of this application, unless otherwise expressly specified and limited, the technical or scientific terms used shall have the ordinary meaning understood by a person with ordinary skills in the art to which this application pertains. Terms such as “installation,” “connection,” and “joining” shall be interpreted broadly, for example, as fixed connection, detachable connection, mating connection, or integral connection. For a person skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0025] See Figure 1 This utility model of an electrolytic aluminum solid waste grading and aluminum extraction device includes a crusher 1, a first conveying unit 2, a ball mill 3, a second conveying unit 6, a horizontal rotary drum screen 7, a primary screen 8, a secondary screen 9, a tertiary screen 10, a lifting plate 11, a closed negative pressure dust removal mechanism 17, a first negative pressure pipeline 20, and a second negative pressure pipeline 22. The outlet of the crusher 1 is connected to the inlet of the ball mill 3 via the first conveying unit 2, and the outlet of the ball mill 3 is connected to the inlet of the horizontal rotary drum screen 7 via the second conveying unit 22. The conveying unit 6 is connected, and the primary screen 8, secondary screen 9, and tertiary screen 10 are all located inside the horizontal rotary drum screen 7. The primary screen 8, secondary screen 9, and tertiary screen 10 are arranged outwards along the central axis of the horizontal rotary drum screen 7. The screen aperture of the primary screen 8 is larger than that of the secondary screen 9, and the screen aperture of the secondary screen 9 is larger than that of the tertiary screen 10. Multiple lifting plates 11 are provided below the primary screen 8, the secondary screen 9, and the tertiary screen 10. The inlet of the crusher 1 and the closed negative pressure dust removal mechanism 17 are connected through the first negative pressure pipe 20, and the ball mill 3 and the inlet of the closed negative pressure dust removal mechanism 17 are connected through the second negative pressure pipe 22.

[0026] Furthermore, the ball mill 3 is equipped with multiple steel balls 4 of different diameters. The rotation of the ball mill 3 drives the steel balls 4 to impact and grind the electrolytic aluminum solid waste, fully separating aluminum particles from ash and impurities. After grinding, the particle size of the electrolytic aluminum solid waste is controlled below 5mm, improving the grinding effect. The initial particle size of electrolytic aluminum solid waste is often uneven, possibly containing large pieces of aluminum slag, small fragments, and powder. Additionally, grinding with steel balls of a single diameter can easily lead to uneven particle size distribution in the product. Large-diameter steel balls 4, with their large mass and strong impact force, can preferentially crush larger pieces of solid waste, reducing their volume; small-diameter steel balls 4 can penetrate into the gaps of the finely crushed electrolytic aluminum solid waste, further grinding smaller particles. This achieves graded processing of "coarse crushing - medium crushing - fine crushing," avoiding the inefficiency caused by insufficient crushing of large pieces of solid waste or excessive impact on small pieces of electrolytic aluminum solid waste caused by steel balls of a single size, and ultimately obtaining a more uniform product. In addition, steel balls of different diameters create more complex motion trajectories within the ball mill (e.g., larger balls mainly perform throwing and impact motions, while smaller balls perform more rolling and grinding motions), covering a wider area of ​​electrolytic aluminum solid waste and reducing "dead zones." Simultaneously, the gaps between the steel balls form a gradient with their diameter differences, ensuring that solid waste of different particle sizes is fully impacted and ground, thus improving overall crushing efficiency.

[0027] In this embodiment, the closed negative pressure dust removal mechanism 17 includes a bag filter 18, an induced draft fan 19, a dust bin 21, and an induced draft duct 23. The bag filter 18 and the induced draft fan 19 are connected by the induced draft duct 23. The dust bin 21 is located below the bag filter 18. During the treatment of electrolytic aluminum solid waste, a large amount of dust (such as aluminum ash, alumina, etc.) is generated. If this dust diffuses into the air, it will not only pollute the environment but may also endanger the health of operators. The closed design can confine the dust within a specific space, preventing its leakage. The negative pressure state (provided by the induced draft fan 19) makes the internal air pressure of the system lower than the external pressure. Under the action of the pressure difference, the dust is actively sucked into the bag filter 18 for treatment, greatly improving dust collection efficiency and reducing the impact on the environment and personnel. The dust bin 21 facilitates the collection of dust filtered by the bag filter 18. In the treatment of electrolytic aluminum solid waste, this dust may contain a certain amount of aluminum or other recyclable components.

[0028] See Figure 2A filter plate 25 is installed in the bottom cavity of the induced draft fan 19. A cleaning brush 26 is installed on the filter plate 25 and connected to multiple connecting rods 27. The dust generated from the treatment of electrolytic aluminum solid waste may contain fine particles (such as aluminum powder, oxide debris, etc.). Even after being treated by the bag filter 18, a small amount of dust may still enter the induced draft fan 19 with the airflow. If these particles directly enter the core components such as the impeller of the induced draft fan, the friction and impact generated by the high-speed rotation will cause impeller wear and imbalance, and may even cause equipment vibration, increased noise, and other problems. In severe cases, it may cause the induced draft fan to stop. The filter plate 25 can perform secondary filtration on the airflow before entering the induced draft fan, further intercepting residual fine dust, reducing dust damage to the internal components of the induced draft fan, extending the service life of the equipment, and reducing the failure rate. During long-term use, dust will accumulate on the surface of the filter plate 25. If not cleaned in time, this can lead to filter plate blockage, increased airflow resistance, reduced negative pressure effect of the induced draft fan, and impact on the dust collection efficiency of the entire dust removal system. The cleaning brush 26 can be directly applied to the surface of the filter plate. Pulling the connecting rod 27 moves the cleaning brush 26 back and forth, thereby cleaning the filter plate 25. Mechanical cleaning removes the dust adhering to the filter plate 25, maintaining its permeability and effectiveness. The bottom of the induced draft fan 19 is equipped with a cleaning door 28. The bottom of the induced draft fan can be directly opened through the cleaning door 28, allowing operators to quickly remove accumulated dust and impurities using tools (such as brushes or high-pressure air guns). This prevents impeller imbalance and increased airflow resistance caused by excessive dust accumulation, ensuring stable airflow and air pressure of the induced draft fan, maintaining its extraction and exhaust efficiency, and preventing dust and impurities from flying out, thus protecting the environment.

[0029] In specific application scenarios, crusher 1 is a jaw crusher, employing the periodic extrusion principle of the moving jaw and fixed jaw. It features a compact structure, convenient maintenance, and quick replacement of worn parts. At least one magnet 12 is provided on the side of the first conveying unit 2. The shape of the magnet is ideally matched to the structure of the first conveying unit 2, allowing it to fit onto it. This ensures comprehensive removal of impurities such as iron, nickel, and cobalt from the electrolytic aluminum solid waste passing through the first conveying unit 2, preventing equipment damage. During subsequent processing (such as crushing, grinding, and sorting), if the electrolytic aluminum solid waste contains hard metal impurities like iron, nickel, and cobalt, these impurities may impact the equipment's blades, screens, and other components, causing wear, deformation, or even breakage, increasing maintenance costs and downtime. Furthermore, reducing the risk of malfunctions, impurities entering the equipment may become entangled in rotating parts, causing jamming, overload, and motor burnout, affecting the stability of the entire processing flow.

[0030] Specifically, the ball mill 3 has an inspection door 5 for maintenance and an observation window 24 for observation on one side. The observation window 24 is located to the side of the inspection door 5. When the ball mill 3 processes electrolytic aluminum solid waste (such as aluminum ash, aluminum slag, etc.), the grinding media (steel balls, etc.) inside will need to be replaced due to long-term wear, and the liner may also be damaged by the impact of the electrolytic aluminum solid waste. The inspection door 5 provides a direct passage into the ball mill, allowing operators to quickly inspect, replace, or clean residual electrolytic aluminum solid waste inside, reducing equipment downtime and improving maintenance efficiency. Through the observation window 24, operators can directly observe the grinding status of the electrolytic aluminum solid waste inside (such as the particle size of the electrolytic aluminum solid waste, the filling amount, and the mixing of steel balls and electrolytic aluminum solid waste), and promptly determine whether the grinding has achieved the expected effect.

[0031] Furthermore, the primary screen 8 is connected to the primary aluminum particle collection unit 13 via a first discharge pipe, the secondary screen 9 is connected to the secondary aluminum particle collection unit 14 via a second discharge pipe, the tertiary screen 10 is connected to the tertiary aluminum particle collection unit 15 via a third discharge pipe, and the end of the horizontal rotary drum screen 7 is connected to the tertiary aluminum particle collection unit 16 via a fourth discharge pipe. The primary aluminum particle collection unit 13, the secondary aluminum particle collection unit 14, the tertiary aluminum particle collection unit 15, and the tertiary aluminum particle collection unit 16 can all be aluminum particle collection bins or aluminum particle collection bags. A specific example is given below: the primary screen 8, the secondary screen 9, and the tertiary screen 10 are arranged sequentially outwards along the central axis of the horizontal rotary drum screen 7. The mesh size of the primary screen 8 is larger than that of the secondary screen 9, and the mesh size of the secondary screen 9 is larger than that of the tertiary screen 10, ensuring that the electrolytic aluminum solid waste is fully dispersed, graded, and prevented from clogging during the screening process. The primary screen 8 uses an 80-mesh screen to filter out larger aluminum particles (mainly blocky aluminum shavings) which enter the primary aluminum particle collection bag; the secondary screen 9 uses a 160-mesh screen to filter out medium-sized aluminum particles (mainly flaky aluminum particles) which enter the secondary aluminum particle collection bag; the tertiary screen 10 uses a 300-mesh screen to filter out fine aluminum particles (mainly powdery aluminum dust) which enter the tertiary aluminum particle collection bag; the residue is ash and slag, which is discharged from the end of the horizontal rotary drum screen 7 and enters the aluminum particle ash and slag collection bag.

[0032] Both the first conveying unit 2 and the second conveying unit 6 can be conveyor belts, with sealed covers on the outside of the conveyor belts to prevent dust from spreading to the outside during transportation. The horizontal rotary drum screen 7 can be placed at an incline, with the rotation speed set at 20-30 r / min and the inclination angle with the horizontal plane at 5-10°, which facilitates material discharge.

[0033] The working principle of this electrolytic aluminum solid waste grading and aluminum extraction device is as follows: The large pieces of electrolytic aluminum solid waste are pre-treated and crushed by the crusher 1 to remove agglomeration and adhesion, providing uniform raw materials for the subsequent grinding process, reducing grinding dead zones in the ball mill, shortening the subsequent fine crushing time, and avoiding subsequent screen clogging. The waste is then conveyed to the ball mill 3 via the first conveying unit 2, where it undergoes fine grinding. This ensures that the aluminum particles are fully separated from the oxide matrix and avoids over-grinding. During the grinding process, the ball mill speed (typically 18-22 r / min) and grinding time (30-60 min) are adjusted to ensure sufficient removal of impurities from the aluminum particle surface. The aluminum particles are then conveyed to a horizontal rotary drum screen 7 via a second conveying unit 6. After being graded and screened by a primary screen 8, a secondary screen 9, and a tertiary screen 10 within the horizontal rotary drum screen 7, aluminum particles of different sizes are extracted and used for resource utilization pathways such as smelting furnaces, refining agents, and water treatment agents. The precise screening of aluminum particles of different sizes through the three-stage screen significantly reduces the aluminum particle rate, substantially improves aluminum recovery efficiency, and reduces resource waste. Simultaneously, the fine aluminum powder collected by the closed negative pressure dust removal mechanism can be compressed into briquettes by a baler for recycling, ultimately achieving efficient separation and full utilization of aluminum particles in electrolytic aluminum solid waste, forming a green and efficient resource utilization system for electrolytic aluminum solid waste. Multiple lifting plates 11 are installed below the primary screen 8, the secondary screen 9, and the tertiary screen 10. During the screening process, electrolytic aluminum solid waste, if falling solely under its own weight, easily accumulates on the screen surface, especially fine particles or highly adhesive electrolytic aluminum solid waste (such as dust containing aluminum oxides, electrolyte residue, etc.), which may clog the screen holes. As the screens or equipment rotate, the lifting plates 11 actively lift and disperse the accumulated electrolytic aluminum solid waste, redistributing it and reducing screen hole clogging caused by accumulation, ensuring unobstructed screening channels. After the lifting plates 11 lift the electrolytic aluminum solid waste, it falls in a more dispersed state, more evenly covering the screen surface, increasing the probability of each particle contacting the screen holes, and preventing excessively thick localized areas of electrolytic aluminum solid waste from affecting the passage of fine particles. Dust generated during the crushing and grinding process is collected by a closed negative pressure dust removal mechanism 17, which centrally treats the dust to prevent it from flowing out into the outside world and protects the health of operators and the environment.

[0034] In summary, this invention removes the adhesion of electrolytic aluminum solid waste slag blocks through pretreatment with a crusher, optimizes the degree of aluminum particle dissociation by combining the controllable ball milling time, and improves the extraction efficiency and purity of aluminum particles through multi-stage screening, thereby maximizing the recycling of aluminum resources. A fully enclosed negative pressure dust removal mechanism is designed, integrating a bag filter to simultaneously collect dust from the crushing, ball milling, and screening processes, effectively controlling dust emissions during processing, reducing environmental pollution, and allowing the collected fine aluminum powder to be compressed and reused. The three-stage drum screening process is optimized, allowing for graded recycling according to aluminum particle size, adapting to the needs of casting alloys, refining agents, water treatment agents, etc., thereby improving resource utilization.

[0035] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A device for graded aluminum extraction from electrolytic aluminum solid waste, characterized in that, The system includes a crusher (1), a first conveying unit (2), a ball mill (3), a second conveying unit (6), a horizontal rotary drum screen (7), a primary screen (8), a secondary screen (9), a tertiary screen (10), a lifting plate (11), a closed negative pressure dust removal mechanism (17), a first negative pressure pipeline (20), and a second negative pressure pipeline (22). The outlet of the crusher (1) is connected to the inlet of the ball mill (3) through the first conveying unit (2), and the outlet of the ball mill (3) is connected to the inlet of the horizontal rotary drum screen (7) through the second conveying unit (6). Next, the primary screen (8), secondary screen (9), and tertiary screen (10) are all located inside the horizontal rotary drum screen (7). The primary screen (8), secondary screen (9), and tertiary screen (10) are arranged outward in sequence along the central axis of the horizontal rotary drum screen (7). The screen aperture of the primary screen (8) is larger than that of the secondary screen (9), and the screen aperture of the secondary screen (9) is larger than that of the tertiary screen (10). Multiple lifting plates (11) are provided below the primary screen (8), below the secondary screen (9), and below the tertiary screen (10). The inlet of the crusher (1) is connected to the inlet of the closed negative pressure dust removal mechanism (17) through the first negative pressure pipe (20), and the ball mill (3) is connected to the inlet of the closed negative pressure dust removal mechanism (17) through the second negative pressure pipe (22).

2. The electrolytic aluminum solid waste grading and aluminum extraction device according to claim 1, characterized in that, The ball mill (3) is equipped with multiple steel balls (4), which have different diameters.

3. The electrolytic aluminum solid waste grading and aluminum extraction device according to claim 1, characterized in that, The closed negative pressure dust removal mechanism (17) includes a bag filter (18), an induced draft fan (19), a dust hopper (21), and an induced draft duct (23). The bag filter (18) and the induced draft fan (19) are connected by the induced draft duct (23), and the dust hopper (21) is located below the bag filter (18).

4. The electrolytic aluminum solid waste grading and aluminum extraction device according to claim 3, characterized in that, A filter plate (25) is provided in the bottom cavity of the blower (19), and a cleaning brush (26) is provided on the filter plate (25). The cleaning brush (26) is connected to multiple connecting rods (27).

5. The electrolytic aluminum solid waste grading and aluminum extraction device according to claim 1, characterized in that, The crusher (1) is a jaw crusher.

6. The electrolytic aluminum solid waste grading and aluminum extraction device according to claim 1, characterized in that, The first conveying unit (2) has at least one magnet (12) on its side.

7. The electrolytic aluminum solid waste grading and aluminum extraction device according to claim 1, characterized in that, The ball mill (3) is provided with an inspection door (5) for maintenance and an observation window (24) for observation on one side, with the observation window (24) located on one side of the inspection door (5).

8. The electrolytic aluminum solid waste grading and aluminum extraction device according to claim 1, characterized in that, The first-stage screen (8) is connected to a first aluminum particle collection unit (13) through a first discharge pipe, the second-stage screen (9) is connected to a second aluminum particle collection unit (14) through a second discharge pipe, the third-stage screen (10) is connected to a third aluminum particle collection unit (15) through a third discharge pipe, and the end of the horizontal rotary drum screen (7) is connected to a fourth aluminum particle collection unit (16) through a fourth discharge pipe. The first aluminum particle collection unit (13), the second aluminum particle collection unit (14), the third aluminum particle collection unit (15), and the fourth aluminum particle collection unit (16) are all aluminum particle collection bins or aluminum particle collection bags.

9. The electrolytic aluminum solid waste grading and aluminum extraction device according to claim 1, characterized in that, Both the first conveying unit (2) and the second conveying unit (6) are conveyor belts, and the conveyor belts are equipped with sealing covers.

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