Waste ring-pull can extrusion forming recovery system and processing technology

Abstract

The invention discloses a waste ring-pull can extrusion forming recovery system and a processing technology, and belongs to the field of ring-pull can recovery processing, the waste ring-pull can extrusion forming recovery system comprises a paint removing structure, a stock bin, a shredding machine, a hammer breaking machine, a cake pressing machine, a box type preheating chain plate machine, an extrusion forming machine and a conveying system; the process of paint removal, physical decomposition (shredding and hammering), compaction (cake pressing), preheating softening (semi-solid state) and high-pressure forming (aluminum rod extrusion) is adopted, complete melting is avoided in the whole process, low-temperature and low-energy-consumption forming is achieved by means of high plasticity and thixotropy of aluminum in the semi-solid state (solid-liquid coexistence), an existing casting method is replaced by the process of machining waste ring-pull cans into aluminum rods, and the production cost is reduced. The problems of high working temperature and large energy consumption and metal loss in the process of recycling the aluminum ring-pull cans at present are solved.

Description

Technical Field

[0001] The invention belongs to the field of can recycling and processing, and relates to an extrusion molding recycling system and a processing technology for waste cans. Background Art

[0002] Recycling cans not only reduces waste accumulation, but also reuses metal materials such as aluminum, reducing the demand for mining new resources, and contributing to environmental protection and sustainable development.

[0003] The existing technology for recycling aluminum cans commonly uses a melting and casting method, which mainly includes the steps of collection, pretreatment, melting, refining and casting. It mainly uses liquid processing, which not only requires a very high melting temperature, but also has relatively high energy consumption and metal loss. Summary of the Invention

[0004] The purpose of the present invention is to provide a waste can extrusion molding recycling system and processing technology, which solves the problems of high operating temperature, energy consumption and metal loss in the current recycling process of aluminum cans.

[0005] The technical solution adopted in the present invention is as follows: A waste can extrusion molding recycling system, including a paint stripping structure, a silo, a shredder, a hammer crusher, a cake press, a box-type preheating chain plate machine, an extrusion molding machine and a conveying system; The silo, shredder, hammer crusher, cake press, box-type preheating chain plate machine, and extrusion molding machine are connected in sequence through a conveying system. The waste cans enter the silo after being stripped of paint. The stripped cans in the silo then pass through the shredder, hammer crusher, cake press, box-type preheating chain plate machine in sequence and enter the extrusion molding machine in a semi-solid form to be processed into aluminum rods.

[0006] The paint stripping structure of the present invention removes paint, coating and organic matter on the surface of the can, avoids the generation of harmful gases or pollution of aluminum during subsequent high-temperature treatment, can ensure the purity of aluminum, reduce pore defects during extrusion molding, and reduce carbon emissions during subsequent heating; the shredder coarsely crushes the can into strips or sheets, which is convenient for subsequent further crushing; the hammer crusher crushes the aluminum sheets into small particles, increases the specific surface area, and improves the subsequent heating efficiency; the shredder and the hammer crusher are combined to form uniform granular materials of the can, which can improve the compaction efficiency of the cake press and reduce air residue; the cake press compresses the loose aluminum fragments into high-density cakes, reducing aluminum The gaps between the fragments reduce the risk of oxidation. A box-type preheating chain conveyor heats the aluminum cake at a controllable temperature (around 500°C) to a semi-solid state (the surface of the aluminum particles is slightly melted, while the interior remains solid). Aluminum exhibits thixotropy (increased fluidity under shear forces) in the semi-solid state, facilitating extrusion molding and reducing energy consumption by over 30% compared to the melt casting method (above 660°C). An extrusion molding machine extrudes the semi-solid aluminum slurry through a die under high pressure to form a dense aluminum rod. The high pressure causes the liquid phase of the semi-solid aluminum to partially fill the gaps between the solid phases, increasing the product's density. Because the aluminum is not fully melted, the grain size is fine, resulting in mechanical properties superior to those of products produced by the melt casting method. The synergistic effects of the various steps of the present invention form a production line for aluminum rods suitable for semi-solid forming. The resulting aluminum rods can achieve a quality comparable to or even higher than that produced by the melt casting method. The semi-solid forming process of the present invention can replace existing melt casting methods, reducing energy consumption and metal loss while ensuring high product quality. The present invention improves the thermal utilization rate of aluminum material through mechanical treatment, and combines the plastic deformation ability of aluminum particles in the solid-liquid phase range to achieve low-temperature and high-efficiency molding.

[0007] Furthermore, the conveying system includes a chain conveyor, a belt conveyor and a dragon conveyor; Among them, the feed port of the silo is connected with the discharge port of the paint stripping structure, the discharge port of the silo is connected with the feed port of the shredder through a chain conveyor, the discharge port of the shredder is connected with the feed port of the hammer crusher through a belt conveyor, the discharge port of the hammer crusher is connected with the feed port of the Jiaolong conveyor through a belt conveyor, the Jiaolong conveyor is provided with multiple discharge ports and each discharge port of the Jiaolong conveyor is connected to a cake press one by one, the discharge port of the cake press is connected with the feed port of the box-type preheating chain plate machine through a belt conveyor, and the discharge port of the box-type preheating chain plate machine is connected with the feed port of the extrusion molding machine.

[0008] The present invention optimizes the conveying structure of each connection according to different mechanical structures and corresponding material forms, so that the entire production line forms a flowing and continuous production path.

[0009] Furthermore, the cans are sequentially passed through a shredder and a hammer crusher to form granular materials with a particle size of less than 5 mm.

[0010] Small particles are easier to compress into high-density cakes, reducing energy waste during preheating. The specific surface area of ​​small particles (<5mm) is much larger than that of complete cans or large fragments, making the subsequent box-type preheating chain conveyor heat faster and more evenly, avoiding the "hot outside and cold inside" problem of large pieces of aluminum due to slow heat conduction, ensuring the consistency of semi-solid softening. When the semi-solid small particles are extruded, the liquid phase can fully fill the solid phase gap, and the density of the aluminum rod can reach more than 98% of the theoretical density. The casting method is usually 95-97%.

[0011] Furthermore, the paint-removed cans in the silo are processed by a shredder and a hammer crusher to form granular materials, and the cake press presses the granular materials into aluminum cakes with a diameter of 150 mm.

[0012] The present invention designs an appropriate aluminum cake size according to actual use conditions.

[0013] Furthermore, the heating temperature of the box-type preheating chain plate machine is 500° C. The aluminum cake is heated by the box-type preheating chain plate machine to form a semi-solid state, and the extrusion molding machine extrudes the semi-solid aluminum to obtain an aluminum rod.

[0014] The present invention optimizes the optimal temperature based on the particle size and the aluminum cake size.

[0015] The processing technology of the above-mentioned waste can extrusion molding recycling system includes the following steps: S1. In the paint stripping structure, a chemical treatment agent is used to strip the surface of the waste cans, and then the waste cans with the paint stripped on the surface are sent to the silo; S2. After the paint is removed from the surface, the waste cans are transported from the silo to the shredder for shredding, and then hammered by the hammer crusher to become granular materials with a particle size of <5mm. They are then transported to the cake press and pressed into aluminum cakes with a diameter of 150mm. They are then sent to the box-type preheating chain conveyor and heated to 500 degrees Celsius to form semi-solid aluminum materials. They are then transferred to the extruder and extruded into aluminum rods of the target diameter. The aluminum rods are used as refining additives in steel mills.

[0016] Furthermore, the chemical treatment agent used for surface stripping of waste cans in the paint stripping structure includes the following components by mass fraction: 40% γ-butyrolactone, 30% dipropylene glycol dimethyl ether, 8% alkaline buffer system, 5% surfactant, 3% corrosion inhibitor, 1% hydroxyethyl cellulose, and the balance is deionized water.

[0017] The paint stripping effect in the present invention has a significant impact on product quality and energy consumption. The paint layer on the surface of the can is the main impurity affecting the product quality. The traditional process is liquid treatment, which is convenient for removing impurities in the liquid; however, the present application is semi-solid treatment, which is not limited to later impurity removal. Therefore, before crushing the waste cans, the present application must perform efficient and thorough paint stripping treatment on the waste cans; the chemical treatment process is better than physical friction, and the loss of aluminum is relatively small. On the basis of the chemical treatment process, the present invention provides a paint stripping chemical treatment agent that is relatively thorough in paint stripping and has very little loss of aluminum.

[0018] The paint layer on the surface of cans is generally a multi-layer composite paint film, which has both good wear resistance and specific color, etc. This composite paint film is difficult to remove; in the present invention, γ-butyrolactone and dipropylene glycol dimethyl ether are compounded to form a "gradient dissolution" effect - the former quickly swells the surface layer of the paint film, and the latter penetrates the interface layer, solving the problem of removing the multi-layer composite paint film with a single solvent; the present invention adds an alkaline buffer system to enable the chemical treatment agent to achieve efficient paint stripping under weak alkalinity. Existing paint stripping treatment agents are generally strong acids or strong bases (sodium hydroxide), which can effectively reduce the corrosion of the treatment agent to aluminum; in the present invention, the surfactant forms a "molecular wedge" effect at the paint-aluminum interface, achieving paint film stripping rather than dissolution by reducing the interface energy; the corrosion inhibitor in the present invention mainly protects the aluminum material and reduces the loss of aluminum material during the paint stripping process.

[0019] Furthermore, the alkaline buffer system includes sodium gluconate and triethanolamine in a mass ratio of 1:1. The chemical treatment agent operates at a pH of 8-9, where sodium gluconate and triethanolamine remain stable. This promotes the hydrolysis of ester bonds in the paint film (alkaline catalysis) and forms a complex protective layer with the aluminum oxide film via carboxylate groups, achieving selective paint removal and aluminum layer protection.

[0020] Furthermore, the surfactant includes alkyl polyglycoside APG-0810 and perfluoropolyether carboxylate in a mass ratio of 1:1.

[0021] Furthermore, the corrosion inhibitor is a sodium molybdate and benzotriazole compound capsule system, and the sodium molybdate and benzotriazole complex is encapsulated in polydopamine nanocapsules and ruptures to release when the pH is greater than 9.

[0022] In the present invention, sodium molybdate and benzotriazole composite corrosion inhibitors are commonly used corrosion inhibition systems. On this basis, the present invention adds polydopamine nanocapsules. The polydopamine nanocapsules rupture when the pH is greater than 9, effectively avoiding the premature consumption of sodium molybdate and benzotriazole. After the paint film is removed, the increased alkalinity (pH greater than 9) triggers the release of the sodium molybdate and benzotriazole composite corrosion inhibitors, thereby protecting the aluminum layer.

[0023] The protective layer formed on the aluminum surface after paint removal in the present invention not only does not damage the performance of the aluminum product, but can significantly improve its use effect as a refining additive in steel plants.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. A waste can extrusion molding recycling system utilizes a technical route: paint stripping → physical decomposition (shredding, hammering) → compaction (pressing into cakes) → preheating and softening (semi-solid state) → high-pressure molding (extruding aluminum rods). This process avoids complete melting and utilizes the high plasticity and thixotropy of aluminum in a semi-solid state (solid-liquid coexistence) to achieve low-temperature, low-energy molding. This replaces the existing melting and casting method for processing waste cans into aluminum rods, resolving the current issues of high operating temperatures, energy consumption, and metal loss in the recycling of aluminum cans. 2. The processing technology of the present invention designs a chemical treatment agent in the paint stripping process, achieving the effects of efficient paint stripping and low aluminum loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort, among which: Figure 1 This is a simplified structural diagram of a waste can extrusion molding recycling system; Figure 2 It is a route diagram of the processing technology of the present invention. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0028] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0029] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0030] Example 1:

[0031] like Figure 1 As shown, a waste can extrusion molding recycling system provided by a preferred embodiment of the present invention includes a paint stripping structure, a silo 1, a shredder 2, a hammer crusher 3, a cake press 4, a box-type preheating chain plate machine 5, an extrusion molding machine 6 and a conveying system; The silo 1, shredder 2, hammer crusher 3, cake press 4, box-type preheating chain plate machine 5, and extrusion molding machine 6 are connected in sequence through a conveying system. The waste cans enter the silo 1 after being stripped of paint. The stripped cans in the silo 1 then pass through the shredder 2, hammer crusher 3, cake press 4, box-type preheating chain plate machine 5 in sequence and enter the extrusion molding machine 6 in a semi-solid form to be processed into aluminum rods.

[0032] The conveying system includes a chain conveyor 7, a belt conveyor 8 and a dragon conveyor 9; Among them, the feed port of the silo 1 is connected with the discharge port of the paint stripping structure, the discharge port of the silo 1 is connected with the feed port of the shredder 2 through the chain conveyor 7, the discharge port of the shredder 2 is connected with the feed port of the hammer crusher 3 through the belt conveyor 8, the discharge port of the hammer crusher 3 is connected with the feed port of the dragon conveyor 9 through the belt conveyor 8, the dragon conveyor 9 is provided with multiple discharge ports and each discharge port of the dragon conveyor 9 is connected to a cake press 4 in a one-to-one correspondence, the discharge port of the cake press 4 is connected with the feed port of the box-type preheating chain plate machine 5 through the belt conveyor 8, and the discharge port of the box-type preheating chain plate machine 5 is connected to the feed port of the extrusion molding machine 6.

[0033] This invention has designed a system suitable for a "mechanical crushing + semi-solid extrusion" process. The technical route of this system is paint stripping → physical decomposition (shredding, hammering) → compaction (pressing into cakes) → preheating and softening (semi-solid state) → high-pressure forming (extruding aluminum rods). This system avoids complete melting throughout the process, leveraging the high plasticity and thixotropy of aluminum in a semi-solid state (solid-liquid coexistence) to achieve low-temperature, low-energy forming. This replaces the existing melt-casting method for processing waste cans into aluminum rods, addressing the current issues of high operating temperatures, energy consumption, and metal loss in the recycling of aluminum cans. Compared to existing melt-casting methods, this system achieves an aluminum recovery rate exceeding 98% and reduces energy consumption by approximately 50%. The aluminum rods produced by this method are used to produce aluminum pellets as deoxidizers in steel mills.

[0034] Example 2:

[0035] Based on Example 1, the cans are sequentially passed through the shredder 2 and the hammer crusher 3 to form granular materials with a particle size of less than 5 mm.

[0036] The paint-removed cans in the silo 1 are processed by the shredder 2 and the hammer crusher 3 to form granular materials, and the cake press 4 presses the granular materials into aluminum cakes with a diameter of 150 mm.

[0037] The heating temperature of the box-type preheating chain plate machine 5 is 500° C. The aluminum cake is heated by the box-type preheating chain plate machine 5 to form a semi-solid state. The extrusion molding machine 6 extrude the semi-solid aluminum to obtain an aluminum rod.

[0038] like Figure 2 As shown, the processing technology based on the above system includes the following steps: S1. In the paint stripping structure, a chemical treatment agent is used to strip the surface of the waste cans, and then the waste cans with the paint stripped on the surface are sent to the silo; S2. After the paint is removed from the surface, the waste cans are transported from the silo to the shredder for shredding, and then hammered by the hammer crusher to become granular materials with a particle size of less than 5mm. They are then transported to the cake press and pressed into aluminum cakes with a diameter of 150mm. They are then sent to the box-type preheating chain conveyor and heated to 500 degrees Celsius to form semi-solid aluminum materials. They are then transferred to the extruder and extruded into aluminum rods of the target diameter. The aluminum rods are used as refining additives in steel mills.

[0039] The present invention limits the particle size of the granular material and then selects the optimal preheating temperature and aluminum cake diameter according to the particle size.

[0040] Example 3:

[0041] Based on Example 2, it is further defined that the chemical treatment agent used for surface stripping of waste cans in the paint stripping structure includes the following components by mass fraction: 40% γ-butyrolactone, 30% dipropylene glycol dimethyl ether, 8% alkaline buffer system, 5% surfactant, 3% corrosion inhibitor, 1% hydroxyethyl cellulose, and the balance is deionized water; the pH of the chemical treatment agent is 8-9.

[0042] The alkaline buffer system comprises sodium gluconate and triethanolamine in a mass ratio of 1:1.

[0043] The surfactant comprises alkyl polyglycoside APG-0810 and perfluoropolyether carboxylate in a mass ratio of 1:1.

[0044] The corrosion inhibitor is a sodium molybdate and benzotriazole compound capsule system. The sodium molybdate and benzotriazole complex is encapsulated in polydopamine nanocapsules and is broken and released when the pH is greater than 9.

[0045] The preparation method of the chemical treatment agent in the present invention is as follows: γ-butyrolactone and dipropylene glycol dimethyl ether are added to a reactor, stirred at 200 rpm at 40°C for 15 minutes, alkyl sugar and perfluoropolyether carboxylate are added, the temperature is raised to 60°C and stirred for 30 minutes until a transparent microemulsion is formed to obtain a solvent phase; sodium gluconate is dissolved in deionized water, ultrasonically assisted dissolution is performed at 50°C, triethanolamine is slowly added, and the final pH is controlled to be 8-9 by an online pH monitor, specifically controlled at pH=8.5±0.2, and the mixture is cooled to 25°C and filtered to remove undissolved impurities to obtain an alkaline buffer system; according to the existing capsule preparation process, a capsule corrosion inhibitor is prepared with sodium molybdate and benzotriazole composite corrosion inhibitor as the core and polydopamine nanomaterial as the shell; finally, the solvent phase and the alkaline buffer system are mixed under vacuum, and then the capsule corrosion inhibitor and hydroxyethyl cellulose are added, and the mixture is stirred at a low speed of 40 rpm for 1 hour to obtain the final chemical treatment agent.

[0046] The paint stripping method using a chemical treatment agent is as follows: the waste cans that have been preliminarily cleaned and dried are immersed in the chemical treatment agent, ultrasonic waves are activated, and after the paint stripping is completed, the cans are drained, washed with water, and dried to obtain the paint stripped cans.

[0047] The chemical treatment agent of the present invention can efficiently remove paint and has a protective effect on aluminum, and can effectively reduce the loss of aluminum in the process of removing paint from cans.

[0048] Comparative Example 1:

[0049] Based on Example 3, this comparative example is different from Example 3 in that the present invention adopts the existing melting and casting method instead of the process given in Example 2, and the paint-removed cans are recycled to prepare aluminum rods. The melting temperature is 660°C, and the cans are melted at 660°C and then subjected to a forming and cooling process to prepare the aluminum rods.

[0050] Comparative Example 2:

[0051] Based on Example 3, the chemical treatment agent used in the paint stripping step in this comparative example does not include a capsule corrosion inhibitor.

[0052] Comparative Example 3:

[0053] Based on Example 3, the corrosion inhibitor in the chemical treatment agent used in the paint stripping step in this comparative example does not include polydopamine nanocapsule shells, and only includes sodium molybdate and benzotriazole.

[0054] Comparative Example 4:

[0055] Based on Example 3, the chemical treatment agent used in the paint stripping step in this comparative example is a NaOH alkaline paint stripper with a pH of 13-14.

[0056] Test Example 1:

[0057] According to the existing method, the aluminum recovery rate of the processes in Example 3 and Comparative Examples 1-4 and the mechanical properties of aluminum rods with the same diameter (10±0.5 mm) were tested. The test results are shown in Table 1.

[0058] The mechanical properties test method of aluminum rod refers to the "GB / T 228.1-2021" metal material tensile test standard and is measured using a universal testing machine.

[0059] Table 1 Aluminum recovery rate and aluminum rod mechanical properties test Aluminum recycling rate (%) Tensile strength (MPa) Yield strength (MPa) Elongation (%) Example 3 98.5~99.2 110~125 85~95 12~18 Comparative Example 1 92.0~94.5 95~105 70~80 8~12 Comparative Example 2 96.0~97.8 105~115 80~88 10~15 Comparative Example 3 97.0~98.0 108~120 83~92 11~16 Comparative Example 4 88.0~91.0 85~95 60~70 5~9 The present invention does not require smelting, can reduce oxidation and burning losses, and has a higher aluminum recovery rate than the existing smelting and casting technology.

[0060] Test Example 2:

[0061] The corrosion rate of the aluminum material by the chemical treatment agent in the paint stripping process in Example 3 and Comparative Examples 2-4 was tested, and the paint stripping time, paint stripping degree and surface roughness of the cans after paint stripping of the same paint film (epoxy paint film) were tested. The test results are shown in Table 2.

[0062] The test method for aluminum corrosion rate is shown in ASTM G31-12a standard.

[0063] Table 2 Paint stripping effect test of chemical treatment agents Example 3 Comparative Example 2 Comparative Example 3 Comparative Example 4 Aluminum corrosion rate (mm / y) <0.001 0.05-0.08 0.02-0.03 >0.5 (local pitting) Paint stripping time (min) 1.5-2.0 2.0-2.5 1.8-2.2 0.5-1.0 (aluminum dissolution) Paint stripping degree (%) ＞98 95-97 96-98 98-99 (with aluminum loss) Surface roughness Ra (μm) 0.08-0.10 0.12-0.15 0.10-0.12 0.5-1.0 (erosion pit) The present invention not only achieves excellent paint stripping results but also provides excellent aluminum protection during the paint stripping process. While the paint stripping time of the present treatment agent is longer than that of a strong alkali, it still takes approximately 1-2 minutes. While existing strong alkalis strip paint quickly, they can cause severe aluminum corrosion. Therefore, the present invention utilizes a chemical treatment agent that both rapidly strips paint and protects aluminum.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made by any technician familiar with the field within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A waste can extrusion molding recycling system, characterized by: It includes a paint stripping structure, a silo (1), a shredder (2), a hammer crusher (3), a cake press (4), a box-type preheating chain plate machine (5), an extrusion molding machine (6) and a conveying system; The silo (1), shredder (2), hammer crusher (3), cake press (4), box-type preheating chain plate machine (5), and extrusion molding machine (6) are sequentially connected through a conveying system. The waste cans are depainted and then enter the silo (1). The depainted cans in the silo (1) then pass through the shredder (2), hammer crusher (3), cake press (4), and box-type preheating chain plate machine (5) in a semi-solid state and enter the extrusion molding machine (6) to be processed into aluminum rods.

2. The waste can extrusion molding recycling system according to claim 1, characterized in that: The conveying system includes a chain conveyor (7), a belt conveyor (8) and a dragon conveyor (9); The feed port of the hopper (1) is connected to the discharge port of the paint stripping structure, the discharge port of the hopper (1) is connected to the feed port of the shredder (2) through the chain conveyor (7), the discharge port of the shredder (2) is connected to the feed port of the hammer crusher (3) through the belt conveyor (8), the discharge port of the hammer crusher (3) is connected to the feed port of the dragon conveyor (9) through the belt conveyor (8), the dragon conveyor (9) is provided with a plurality of discharge ports and each discharge port of the dragon conveyor (9) is connected to a cake press (4) in a one-to-one correspondence, the discharge port of the cake press (4) is connected to the feed port of the box-type preheating chain plate machine (5) through the belt conveyor (8), and the discharge port of the box-type preheating chain plate machine (5) is connected to the feed port of the extrusion molding machine (6).

3. The waste can extrusion molding recycling system according to claim 1, characterized in that: The cans are sequentially processed through a shredder (2) and a hammer crusher (3) to form granular materials with a particle size of less than 5 mm.

4. The waste can extrusion molding recycling system according to claim 3, characterized in that: The paint-removed cans in the silo (1) are processed by the shredder (2) and the hammer crusher (3) to form granular materials, and the cake press (4) presses the granular materials into aluminum cakes with a diameter of 150 mm.

5. The waste can extrusion molding recycling system according to claim 4, characterized in that: The heating temperature of the box-type preheating chain plate machine (5) is 500°C. The aluminum cake is heated by the box-type preheating chain plate machine (5) to form a semi-solid state. The extrusion molding machine (6) extrudes the semi-solid aluminum to obtain an aluminum rod.

6. Based on the processing technology of the waste can extrusion molding recycling system according to claims 1-5, it is characterized by: The following steps are involved: S1. In the paint stripping structure, a chemical treatment agent is used to strip the surface paint of the waste cans, and then the waste cans with the paint stripped on the surface are sent to the silo; S2. After the paint is removed from the surface, the waste cans are transported from the silo to the shredder for shredding, and then hammered by the hammer crusher to become granular materials with a particle size of less than 5mm. They are then transported to the cake press and pressed into aluminum cakes with a diameter of 150mm. They are then sent to the box-type preheating chain conveyor and heated to 500 degrees Celsius to form semi-solid aluminum materials. They are then transferred to the extruder and extruded into aluminum rods of the target diameter. The aluminum rods are used as refining additives in steel mills.

7. The processing technology according to claim 1, characterized in that: The chemical treatment agent used for surface stripping of waste cans in the paint stripping structure includes the following components by mass fraction: 40% γ-butyrolactone, 30% dipropylene glycol dimethyl ether, 8% alkaline buffer system, 5% surfactant, 3% corrosion inhibitor, 1% hydroxyethyl cellulose, and the balance is deionized water; the pH of the chemical treatment agent is 8-9.

8. The processing technology according to claim 7, characterized in that: The alkaline buffer system comprises sodium gluconate and triethanolamine in a mass ratio of 1:

1.

9. The processing technology according to claim 7, characterized in that: The surfactant comprises alkyl polyglycoside APG-0810 and perfluoropolyether carboxylate in a mass ratio of 1:

1.

10. The processing technology according to claim 7, characterized in that: The corrosion inhibitor is a sodium molybdate and benzotriazole compound capsule system. The sodium molybdate and benzotriazole complex is encapsulated in polydopamine nanocapsules and is broken and released when the pH is greater than 9.

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