A primary recycling method of waste aluminum zip-top can
By optimizing the pretreatment, refining, and composite modification processes of waste aluminum cans, the problem of impurities affecting the recycling process was solved, achieving efficient and low-cost recycling of recycled aluminum alloys and improving metallurgical quality and mechanical properties.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GUANGDONG INST OF NEW MATERIALS
- Filing Date
- 2024-10-24
- Publication Date
- 2026-05-19
AI Technical Summary
Existing methods for recycling waste aluminum cans inevitably introduce impurities, oxides, and residual organic matter, affecting the metallurgical quality and mechanical properties of recycled aluminum alloys.
The process involves pretreatment, refining, composite modification, and casting. Pretreatment removes oil and moisture, followed by melting in a double-chamber furnace, magnetic stirring, and vortex formation. Refining is performed with a refining agent, followed by modification treatment with an Al-Sr-RE composite modifier, and finally casting with an Al-Ti-B refining agent and a ceramic filter plate.
It improves the quality and recycling rate of recycled aluminum alloys, reduces production costs, and is suitable for large-scale industrial applications.
Smart Images
Figure CN119177344B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of aluminum alloy recycling technology, specifically to a primary recycling method for waste aluminum beverage cans. Background Technology
[0002] Aluminum beverage cans consist of three parts: a pull tab, a lid, and a can body. The pull tab and lid are typically made of high-strength 5XXX series aluminum alloys, while the can body is machined from 3104 aluminum alloy. The alloy element composition of the three components of an aluminum beverage can is basically the same, mainly including Al, Mn, and Mg. The can body accounts for a large proportion of the can's mass (approximately 75%–90% of the total can mass), thus allowing for the recycling of the can body material through remelting. However, due to the influence of the usage environment and recycling conditions, impurities, oxides, and residual organic matter are inevitably introduced during the recycling process of aluminum beverage cans. Furthermore, because the can body is only 0.2μm–0.4μm thick with a large specific surface area, it is highly susceptible to oxidation, burning, and floating on the surface of the molten metal, ultimately severely affecting the metallurgical quality and mechanical properties of the recycled aluminum alloy.
[0003] During the recycling of aluminum cans, impurities such as Fe and Si react with alloying element Mn to form large-sized iron-rich phases, which severely affect the alloy's formability and mechanical properties. Currently, the main methods to reduce the harmful effects of these iron-rich phases include the following two:
[0004] 1) Reduce the iron content in recycled aluminum alloys through pretreatment and dilution: Pretreatment can significantly reduce the Fe content in recycled aluminum alloys, but it will still be higher than the Fe content of the can itself. The dilution method can ensure that the Fe content is not higher than the Fe content of the can itself, but it reduces the grade of the diluted aluminum material, and the recycled aluminum alloy needs to be downgraded for use.
[0005] 2) Modify or homogenize the iron-rich phase in recycled aluminum alloys to improve the morphology and distribution of the iron-rich phase:
[0006] a) Homogenization treatment can promote the dissolution and spheroidization of the iron-rich phase through high-temperature heat preservation, thereby reducing the size of the iron-rich phase. However, this method has limited effect on improving the size of the iron-rich phase.
[0007] b) Modification treatment improves the type and size of the iron-rich phase by adding modifying elements such as Be, Sr, Zr, and RE. For example, CN 107385257A discloses a method for modifying the iron-rich phase of recycled aluminum alloys. By using an AlW master alloy to form an AlSiFeW quaternary phase, the dominant growth orientation of the iron-rich phase is changed, thereby reducing the size of the iron-rich phase. However, after adding AlW, strong mechanical stirring with a graphite rod is required, making the preparation process complex and the production efficiency low. CN108374109A discloses a method for preparing recycled aluminum alloys from waste aluminum cans. By using a mother liquor covering method and adding an Al-Ce binary alloy, an Al-Mn-Mg-xCe alloy is obtained by casting. However, this preparation process involves two meltings, and the Ce content reaches 1.0%, resulting in high costs.
[0008] Therefore, it is of great significance to develop an aluminum alloy recycling method that is low-cost, has a high recycling rate, and can realize primary recycling of waste aluminum cans. Summary of the Invention
[0009] The purpose of this invention is to solve the problem that existing methods for recycling waste aluminum cans inevitably introduce impurities, oxides, and residual organic matter, which significantly affect the metallurgical quality and mechanical properties of recycled aluminum alloys. This invention provides a primary recycling method for waste aluminum cans.
[0010] The technical solution adopted in this invention is:
[0011] A primary recycling method for waste aluminum beverage cans includes the following steps:
[0012] 1) Pre-treatment: The waste aluminum cans are crushed and then put into a spin dryer with heating function to remove water and oil stains, so as to obtain can fragments;
[0013] 2) Preparation of mother liquor: Add aluminum can production waste to a double-chamber furnace, heat and melt to obtain mother liquor;
[0014] 3) Melting of waste aluminum cans: Start the stirring device of the double chamber furnace to make the mother liquor form a vortex, and then add the aluminum can fragments into the double chamber furnace through the side well feeding port for submerged melting to obtain the melt;
[0015] 4) First refining and transfer: Add refining agent to the melt to refine the melt, remove the slag on the surface of the melt, and then transfer the melt to the alloying furnace;
[0016] 5) Composition adjustment and second refining: Sample the melt composition for testing, and adjust the melt composition by adding raw materials according to the designed composition. Then, add refining agent to refine the melt.
[0017] 6) Composite modification: Remove the slag from the surface of the melt, then add Al-Sr-RE composite modifier for modification treatment, then add a covering agent and let it stand;
[0018] 7) Casting: The molten material is cast into a mold to obtain recycled aluminum alloy.
[0019] Preferably, after the waste aluminum cans in step 1) are crushed, they are also subjected to electromagnetic iron removal and eddy current impurity removal.
[0020] Preferably, the aluminum can production waste in step 2) includes at least one of the following: waste head, waste tail, and recycled material from the flow channel.
[0021] Preferably, the stirring device in step 3) is a magnetic stirring device.
[0022] Preferably, in step 4), the refining agent is introduced into the melt using high-purity argon or high-purity nitrogen as a carrier.
[0023] Preferably, the amount of refining agent used in step 4) is 0.15% to 0.30% of the melt mass.
[0024] Preferably, the refining time in step 4) is 10 min to 30 min.
[0025] Preferably, in step 5), the refining agent is introduced into the melt using high-purity argon or high-purity nitrogen as a carrier.
[0026] Preferably, the amount of refining agent used in step 5) is 0.05% to 0.15% of the melt mass.
[0027] Preferably, the refining time in step 5) is 10 min to 20 min.
[0028] Preferably, the RE in the Al-Sr-RE composite modifier in step 6) is at least one of La and Ce. La and Ce have large reserves and low prices, which can reduce the production cost of recycled aluminum alloys.
[0029] Preferably, the amount of Al-Sr-RE composite modifier used in step 6) is 0.1% to 0.5% of the melt mass.
[0030] Preferably, the time for the deterioration treatment in step 6) is 5 min to 30 min.
[0031] Preferably, the amount of the covering agent in step 6) is 0.02% to 0.05% of the melt mass.
[0032] Preferably, the settling time in step 6) is 20 min to 60 min.
[0033] Preferably, step 7) of casting includes the following operations: the melt is introduced into a flow channel containing Al-Ti-B refining agent, then flows through a graphite rotor degassing box and a two-stage ceramic filter plate / box, and then flows into a casting tray for casting.
[0034] Preferably, the amount of the Al-Ti-B refining agent is 0.15% to 0.20% of the melt mass.
[0035] Preferably, the recycled aluminum alloy in step 7) is an aluminum alloy round bar or an aluminum alloy flat ingot.
[0036] The beneficial effects of this invention are: by improving and optimizing the melting and modification processes in the recycling of waste aluminum cans, this invention reduces the burning loss of waste materials and improves the quality of recycled aluminum alloys, enabling primary recycling of waste aluminum cans with low cost, high recycling rate, and suitability for large-scale industrial application.
[0037] Specifically:
[0038] 1) Regarding the melting of waste aluminum cans: This invention sets up two key steps. First, a centrifuge with heating function is used to remove oil, moisture and coatings from the surface of waste aluminum cans. Second, the pre-prepared mother liquor and the stirring mother liquor are used to cause the preheated and dehydrated aluminum can fragments to be drawn into the aluminum liquid vortex, realizing the underwater melting of the waste material, reducing the contact time with air, thereby reducing oxidation and burn-off, and improving the recycling rate.
[0039] 2) Regarding iron-rich phase transformation: This invention employs Al-Sr-RE composite transformation technology, utilizing the highly active Al4(SrRE) phase formed by the Al-Sr-RE composite transforming agent and Al... 11 The (SrRE)3 phase is used to suppress the nucleation and growth of the iron-rich phase, thereby improving the morphology, size, and distribution of the iron-rich phase. In addition, the Al-Sr-RE composite modifier can also improve the microsegregation of Fe, Mn, Si, and other elements at grain boundaries and within grains, which is beneficial to the uniform precipitation of high-temperature dispersed phases and inhibits the growth of recrystallized grains.
[0040] In summary, this invention combines the melting and composite modification treatment technology of waste aluminum cans, which improves the recycling rate of waste aluminum cans and reduces the content of pollutants. At the same time, the composite modification refines the iron-rich phase, improves the processability and mechanical properties of recycled aluminum alloys, and achieves efficient and low-cost recycling of waste aluminum cans. Attached Figure Description
[0041] Figure 1 The image shows a SEM image of the recycled aluminum alloy prepared in Example 1.
[0042] Figure 2The image shows a SEM image of the recycled aluminum alloy prepared in Comparative Example 1.
[0043] Figure 3 The image shows a SEM image of the recycled aluminum alloy prepared in Comparative Example 2.
[0044] Figure 4 The image shows a SEM image of the recycled aluminum alloy prepared in Comparative Example 3. Detailed Implementation
[0045] The present invention will be further explained and described below with reference to specific embodiments.
[0046] Example 1:
[0047] A primary recycling method for waste aluminum beverage cans includes the following steps:
[0048] 1) Pre-treatment: The waste aluminum cans are crushed, subjected to electromagnetic iron removal and eddy current impurity removal, and then put into a centrifuge with heating function to remove water and oil stains, so as to obtain aluminum can fragments.
[0049] 2) Preparation of mother liquor: Add aluminum can production waste (including material head, material tail, and recycled material from the flow channel, etc.) into a double-chamber furnace, heat and melt to obtain mother liquor;
[0050] 3) Melting of waste aluminum cans: Start the magnetic stirring device of the double chamber furnace to make the mother liquor form a vortex, and then use a conveyor belt to put the can fragments into the double chamber furnace through the side well feeding port for submerged melting to obtain the melt;
[0051] 4) First refining and transfer: Using 99.99% pure nitrogen as a carrier, commercially available aluminum alloy refining agent (halide) is evenly blown into the melt for refining. The amount of refining agent is 0.15% of the melt mass, and the refining time is 10 minutes. Then, the slag on the surface of the melt is removed, and the melt is transferred to the alloying furnace.
[0052] 5) Composition Adjustment and Secondary Refining: Sample the melt composition for testing, and adjust the melt composition according to the designed composition (the composition of the aluminum alloy by mass percentage is as follows: Mn: 0.9%; Si: 0.4%; Mg: 1.35%; Fe: 0.39%; Cu: 0.15%; Ce: 0.03%; Sr: 0.022%, with the balance being unavoidable impurity elements and Al). Then, use 99.99% pure nitrogen as a carrier to uniformly blow commercially available aluminum alloy refining agent (halides) into the melt for refining. The amount of refining agent used is 0.12% of the melt mass, and the refining time is 15 minutes.
[0053] 6) Composite modification: Remove the slag from the surface of the melt, then add Al-8Sr-8Ce composite modifier for modification treatment. The amount of modifier is 0.4% of the melt mass, and the modification treatment time is 10 min. Then add commercially available aluminum alloy covering agent (chloride). The amount of covering agent is 0.05% of the melt mass, and let stand for 20 min.
[0054] 7) Casting: The melt is introduced into a flow channel containing Al-Ti-B refining agent, the amount of refining agent being 0.15% of the melt mass, and then flows through a graphite rotor degassing box and a two-stage ceramic filter plate / box, before flowing into a casting tray for casting to obtain recycled aluminum alloy (round bars or flat ingots).
[0055] Example 2:
[0056] A primary recycling method for waste aluminum beverage cans includes the following steps:
[0057] 1) Pre-treatment: The waste aluminum cans are crushed, subjected to electromagnetic iron removal and eddy current impurity removal, and then put into a centrifuge with heating function to remove water and oil stains, so as to obtain aluminum can fragments.
[0058] 2) Preparation of mother liquor: Add aluminum can production waste (including material head, material tail, and recycled material from the flow channel, etc.) into a double-chamber furnace, heat and melt to obtain mother liquor;
[0059] 3) Melting of waste aluminum cans: Start the magnetic stirring device of the double chamber furnace to make the mother liquor form a vortex, and then use a conveyor belt to put the can fragments into the double chamber furnace through the side well feeding port for submerged melting to obtain the melt;
[0060] 4) First refining and transfer: Using 99.9% pure nitrogen as a carrier, commercially available aluminum alloy refining agent (halide) is evenly blown into the melt for refining. The amount of refining agent is 0.20% of the melt mass, and the refining time is 20 minutes. Then, the slag on the surface of the melt is removed, and the melt is transferred to the alloying furnace.
[0061] 5) Composition Adjustment and Second Refining: Sample the melt composition for testing, and adjust the melt composition according to the designed composition (the composition of the aluminum alloy by mass percentage is as follows: Mn: 0.8%; Si: 0.2%; Mg: 1.1%; Fe: 0.25%; Cu: 0.1%; La: 0.04%; Sr: 0.02%, with the balance being unavoidable impurity elements and Al). Then, use 99.9% pure nitrogen as a carrier to uniformly blow commercially available aluminum alloy refining agent (halide) into the melt for refining. The amount of refining agent used is 0.10% of the melt mass, and the refining time is 10 minutes.
[0062] 6) Composite modification: Remove the slag from the surface of the melt, then add Al-8Sr-14La composite modifier for modification treatment. The amount of modifier is 0.3% of the melt mass, and the modification treatment time is 15 min. Then add commercially available aluminum alloy covering agent (chloride). The amount of covering agent is 0.02% of the melt mass, and let stand for 40 min.
[0063] 7) Casting: The melt is introduced into a flow channel containing Al-Ti-B refining agent, the amount of refining agent being 0.20% of the melt mass, and then flows through a graphite rotor degassing box and a two-stage ceramic filter plate / box, before flowing into a casting tray for casting to obtain recycled aluminum alloy (round bars or flat ingots).
[0064] Example 3:
[0065] A primary recycling method for waste aluminum beverage cans includes the following steps:
[0066] 1) Pre-treatment: The waste aluminum cans are crushed, subjected to electromagnetic iron removal and eddy current impurity removal, and then put into a centrifuge with heating function to remove water and oil stains, so as to obtain aluminum can fragments.
[0067] 2) Preparation of mother liquor: Add aluminum can production waste (including material head, material tail, and recycled material from the flow channel, etc.) into a double-chamber furnace, heat and melt to obtain mother liquor;
[0068] 3) Melting of waste aluminum cans: Start the magnetic stirring device of the double chamber furnace to make the mother liquor form a vortex, and then use a conveyor belt to put the can fragments into the double chamber furnace through the side well feeding port for submerged melting to obtain the melt;
[0069] 4) First refining and transfer: Using nitrogen gas with a purity of 99.95% as a carrier, commercially available aluminum alloy refining agent (halide) is evenly blown into the melt for refining. The amount of refining agent is 0.25% of the melt mass, and the refining time is 25 minutes. Then, the slag on the surface of the melt is removed, and the melt is transferred to the alloying furnace.
[0070] 5) Composition Adjustment and Second Refining: Sample the melt composition for testing, and adjust the melt composition according to the designed composition (the composition of the aluminum alloy by mass percentage is as follows: Mn: 1%; Si: 0.1%; Mg: 0.95%; Fe: 0.15%; Cu: 0.2%; La: 0.01%; Ce: 0.01%; Sr: 0.01%, with the balance being unavoidable impurity elements and Al). Then, use 99.95% pure nitrogen as a carrier to uniformly blow commercially available aluminum alloy refining agent (halide) into the melt for refining. The amount of refining agent used is 0.08% of the melt mass, and the refining time is 12 minutes.
[0071] 6) Composite modification: Remove the slag from the surface of the melt, then add Al-6Sr-5Ce-5La composite modifier for modification treatment. The amount of modifier is 0.2% of the melt mass, and the modification treatment time is 5 min. Then add commercially available aluminum alloy covering agent (chloride) at a rate of 0.03% of the melt mass and let it stand for 30 min.
[0072] 7) Casting: The melt is introduced into a flow channel containing Al-Ti-B refining agent, the amount of refining agent being 0.15% of the melt mass, and then flows through a graphite rotor degassing box and a two-stage ceramic filter plate / box, before flowing into a casting tray for casting to obtain recycled aluminum alloy (round bars or flat ingots).
[0073] Example 4:
[0074] A primary recycling method for waste aluminum beverage cans includes the following steps:
[0075] 1) Pre-treatment: The waste aluminum cans are crushed, subjected to electromagnetic iron removal and eddy current impurity removal, and then put into a centrifuge with heating function to remove water and oil stains, so as to obtain aluminum can fragments.
[0076] 2) Preparation of mother liquor: Add aluminum can production waste (including material head, material tail, and recycled material from the flow channel, etc.) into a double-chamber furnace, heat and melt to obtain mother liquor;
[0077] 3) Melting of waste aluminum cans: Start the magnetic stirring device of the double chamber furnace to make the mother liquor form a vortex, and then use a conveyor belt to put the can fragments into the double chamber furnace through the side well feeding port for submerged melting to obtain the melt;
[0078] 4) First refining and transfer: Using nitrogen gas with a purity of 99.93% as a carrier, commercially available aluminum alloy refining agent (halide) is evenly blown into the melt for refining. The amount of refining agent is 0.30% of the melt mass, and the refining time is 30 minutes. Then, the slag on the surface of the melt is removed, and the melt is transferred to the alloying furnace.
[0079] 5) Composition Adjustment and Secondary Refining: Sample the melt composition for testing, and adjust the melt composition according to the designed composition (the composition of the aluminum alloy by mass percentage is as follows: Mn: 1.2%; Si: 0.3%; Mg: 1.2%; Fe: 0.5%; Cu: 0.05%; Ce: 0.035%; La: 0.015%; Sr: 0.016%, with the balance being unavoidable impurity elements and Al). Then, use 99.96% pure nitrogen as a carrier to uniformly blow commercially available aluminum alloy refining agent (halides) into the melt for refining. The amount of refining agent used is 0.05% of the melt mass, and the refining time is 10 minutes.
[0080] 6) Composite modification: Remove the slag from the surface of the melt, then add Al-4Sr-7Ce-3La composite modifier for modification treatment. The amount of modifier is 0.5% of the melt mass, and the modification treatment time is 10 min. Then add commercially available aluminum alloy covering agent (chloride) at a rate of 0.04% of the melt mass and let it stand for 35 min.
[0081] 7) Casting: The melt is introduced into a flow channel containing Al-Ti-B refining agent, the amount of refining agent being 0.15% of the melt mass, and then flows through a graphite rotor degassing box and a two-stage ceramic filter plate / box, before flowing into a casting tray for casting to obtain recycled aluminum alloy (round bars or flat ingots).
[0082] Comparative Example 1:
[0083] A method for recycling waste aluminum cans is identical to Example 1, except that step 6) does not include the step of "adding Al-8Sr-8Ce composite modifier for modification treatment".
[0084] Comparative Example 2:
[0085] A method for recycling waste aluminum cans is identical to Example 1, except that the modifier in step 6) is replaced by "Al-8Sr-8Ce composite modifier" or similar material with "Al-8Sr modifier".
[0086] Comparative Example 3:
[0087] A method for recycling waste aluminum cans is identical to Example 1, except that the modifier in step 6) is replaced by "Al-8Ce modifier" instead of "Al-8Sr-8Ce composite modifier".
[0088] Comparative Example 4:
[0089] A method for recycling waste aluminum cans is identical to Example 1, except that the modifier in step 6) is replaced by "Al-8Sr-8Ce composite modifier" by mass ratio of "Al-8Sr modifier and Al-8Ce modifier (mass ratio of 1:1)".
[0090] Performance testing:
[0091] 1) The microstructure of the recycled aluminum alloys (round bars) obtained in Examples 1-4 and Comparative Examples 1-4 was tested using scanning electron microscopy (SEM). (SEM images of the recycled aluminum alloys obtained in Examples 1 and Comparative Examples 1-3 are shown in the figure.) Figures 1-4As shown in the figure, the morphological characteristics (average area and average roundness) of the iron-rich phase in the SEM image were statistically analyzed using image processing software. The morphological characteristic data of the iron-rich phase in the recycled aluminum alloy are shown in the table below:
[0092] Table 1. Morphological characteristics of iron-rich phases in recycled aluminum alloys
[0093] Test Project Average area (μm) Average roundness Example 1 14.41 3.05 Comparative Example 1 28.21 4.99 Comparative Example 2 17.15 4.30 Comparative Example 3 19.71 4.25 Comparative Example 4 16.56 3.85 Example 2 14.53 3.12 Example 3 13.86 2.95 Example 4 14.25 3.09
[0094] Note: Roundness is a characteristic parameter of particle shape factor, which can be expressed by the formula R = (P 2 The formula is calculated using / 4πA), where P is the perimeter of the particle and A is the area of the particle. The minimum value of R is 1, which indicates that the particle is a standard circle. The closer the particle shape is to a standard circle, the smaller its value.
[0095] 2) The mechanical properties of the recycled aluminum alloys obtained in Examples 1-4 and Comparative Examples 1-4 were tested according to "GB / T 228.1 Metallic materials - Tensile testing - Part 1: Test method at room temperature". The test results are shown in the table below:
[0096] Table 2. Test results of mechanical properties of recycled aluminum alloys
[0097] Test Project Tensile strength (MPa) Yield strength (MPa) Elongation (%) Example 1 215 100 20.5 Comparative Example 1 213 112 14.8 Comparative Example 2 210 105 16.2 Comparative Example 3 212 103 15.5 Comparative Example 4 216 113 16.8 Example 2 203 98 21.3 Example 3 222 118 19.8 Example 4 206 100 19.6
[0098] Depend on Figures 1-4 Tables 1 and 2 show that Sr and Ce both have a certain modification effect on the iron-rich phase, which can improve the plasticity of recycled aluminum alloys to a certain extent. Moreover, the Al-Sr-Ce composite modification effect is better than the simple combination of adding Ce, Sr or Al-Sr / Al-Ce alone.
[0099] In summary, by optimizing the melting process and iron-rich phase transformation process of waste aluminum cans, this invention can significantly improve the mechanical properties of recycled aluminum alloys, which is beneficial for the preservation and utilization of waste aluminum can materials.
[0100] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.
Claims
1. A primary recycling method for waste aluminum beverage cans, characterized in that, Includes the following steps: 1) Pre-treatment: The waste aluminum cans are crushed and then put into a spin dryer with heating function to remove water and oil stains, so as to obtain can fragments; 2) Preparation of mother liquor: Add aluminum can production waste to a double-chamber furnace, heat and melt to obtain mother liquor; 3) Melting of waste aluminum cans: Start the stirring device of the double chamber furnace to make the mother liquor form a vortex, and then add the aluminum can fragments into the double chamber furnace through the side well feeding port for submerged melting to obtain the melt; 4) First refining and transfer: Add refining agent to the melt to refine the melt, remove the slag on the surface of the melt, and then transfer the melt to the alloying furnace; 5) Composition adjustment and second refining: Take samples to test the melt composition, and add raw materials to adjust the melt composition according to the design composition. Then add refining agent to refine the melt. 6) Composite modification: Remove the slag from the surface of the melt, then add Al-Sr-RE composite modifier for modification treatment, then add a covering agent and let it stand; 7) Casting: The molten material is cast into a mold to obtain recycled aluminum alloy; Step 6) The RE in the Al-Sr-RE composite modifier is at least one of La and Ce; Step 6) The amount of the Al-Sr-RE composite modifier used is 0.1% to 0.5% of the melt mass; Step 6) The time for the deterioration treatment is 5 min to 30 min.
2. The primary recycling method for waste aluminum beverage cans according to claim 1, characterized in that: Step 1) The waste aluminum cans were crushed and then subjected to electromagnetic iron removal and eddy current impurity removal.
3. The primary recycling method for waste aluminum beverage cans according to claim 1, characterized in that: Step 4) The amount of refining agent used is 0.15% to 0.30% of the melt mass.
4. The primary recycling method for waste aluminum beverage cans according to claim 1 or 3, characterized in that: Step 4) The refining time is 10 min to 30 min.
5. The primary recycling method for waste aluminum beverage cans according to claim 1, characterized in that: Step 5) The amount of refining agent used is 0.05% to 0.15% of the melt mass.
6. The primary recycling method for waste aluminum beverage cans according to claim 1 or 5, characterized in that: Step 5) The refining time is 10 min to 20 min.
7. The primary recycling method for waste aluminum beverage cans according to claim 1, characterized in that: Step 6) The amount of the covering agent is 0.02% to 0.05% of the melt mass.
8. The primary recycling method for waste aluminum beverage cans according to claim 1, characterized in that: Step 6) The settling time is 20 min to 60 min.