JP4052659B2 - Method for removing laminated resin from laminated aluminum scrap material or laminated aluminum can, and recycling method for laminated aluminum scrap material or laminated aluminum can - Google Patents

Description

  The present invention relates to a method for improving the efficiency of aluminum recycling by heating and removing a laminated resin from a used aluminum can or the like whose surface is laminated with a resin film.

  In recent years, dry molding that does not use an organic solvent has been performed by laminating polyethylene terephthalate (PET) or a polyester film on an aluminum base material as a countermeasure against environmental pollution caused by an organic solvent in an aluminum can coating process. In particular, a PET film as a resin for laminated aluminum cans is an excellent material from the viewpoints of adhesion to an aluminum substrate surface, corrosion resistance, prevention of environmental pollution, and the like.

  However, when the aluminum is recycled from the laminated aluminum scrap material discharged in the manufacturing process of the aluminum can or the used laminated aluminum can, the laminate resin such as PET becomes an obstacle to the recycling. Specifically, when laminating aluminum scraps or the like are put into the melting furnace after the pressing process, the laminating resin burns and oxidizes the aluminum surface, so the aluminum recycling rate decreases or the melting furnace temperature rises rapidly. Therefore, temperature control becomes difficult, and black smoke is generated by burning the laminate resin.

  Here, as a method of removing the laminated aluminum scrap material and the laminated resin from the used laminated aluminum can, (1) a method of mechanically blasting only the resin film from the aluminum surface and removing it mechanically ( 2) A method of dissolving and removing a resin film by dipping in a stripping solution containing an organic solvent, and (3) a combustion treatment method of burning the resin film with a burner have been tried.

  However, with the mechanical removal method (1), in the case of a complicated shape such as a pressed product, the resin film on the inner surface cannot be removed even if the resin film on the outer surface can be removed. Even with the organic solvent method (2), when the density of the press-processed product is high, the solvent does not penetrate into the inside and the removal rate is low. Moreover, the investment cost of peripheral equipment, such as the processing equipment of the organic solvent which dissolved the resin film, becomes high. Furthermore, in the combustion treatment method (3), aluminum is burned at the same time as the resin film, so the recycling rate is lowered. As described above, the method for removing the laminate resin from the aluminum scrap material or the like at a practical level has not yet been completed.

  On the other hand, the process of making used recovered steel cans into high-density spheroidized products of 0.5 g / cc or more, the step of oxidizing and burning steel can surface coating and inner surface coating agents under aerobic conditions, and heat treatment Patent Document 1 discloses a technique related to recycling of steel cans, which includes a step of stripping the oxidized oxide film.

Patent Document 2 discloses a technique for efficiently recovering high-grade steel and aluminum materials from used steel cans or aluminum cans and separating and recovering paints or coating materials. In the technique of Patent Document 2, a used steel can or aluminum can is heated in a non-oxidizing atmosphere, thereby vaporizing or decomposing a paint or a coating material covering the surface and inner surface of the can body.
JP 2001-29918 A JP 2002-1292 A

  However, the technique disclosed in Patent Document 1 is a technique for recovering iron from a steel can, and effectively uses aluminum forming a part of the steel can as a reducing material and a deoxidizing refining material in the steel making process. To do. Therefore, even if this technology is applied to a laminated aluminum can as it is, the recycling efficiency of aluminum cannot be increased.

  In addition, the technique disclosed in Patent Document 2 is a technique for recovering a coating material by vaporizing or decomposing it by heating a steel can or an aluminum can in a non-oxidizing atmosphere. The extent to which the coating resin can be removed from steel and aluminum cans is unknown because there is no specific description. Further, since heating is performed in a non-oxidizing atmosphere, the heating temperature must be increased, and aluminum may be melted.

  Furthermore, when heated at a high temperature close to the melting point of aluminum, it may react with oxygen in the air to form an oxide film on the surface of the aluminum can. In particular, when recycling as an aluminum can, high-purity aluminum is required as a recycled product. However, when an oxide film is formed, it is difficult to remove the oxide film, so it cannot be recycled as an aluminum can. . As a result, when recovering aluminum in a melting furnace, the problem that the recovery rate of aluminum falls occurs. In addition, an increase in operating cost associated with heating at a high temperature and an increase in cost for ventilating a non-oxidizing gas (for example, nitrogen gas) are also problems.

  An object of this invention is to provide the method of removing a laminate resin efficiently from a laminated aluminum waste material or a used laminated aluminum can.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that the aluminum scrap materials overlap each other in the conventional press product formed by the press treatment in order to reduce the transportation cost of the aluminum scrap material crushed product. It has been clarified that there are many portions with high density, and this portion causes a decrease in the removal rate of the laminate resin in the conventional removal method. Therefore, the apparent bulk density is reduced by cutting the pressed product as a pretreatment, and then the oxidation of the aluminum surface occurs when the laminate resin is decomposed and removed under an oxygen atmosphere below the melting point of aluminum. The optimum conditions that did not progress were studied and the present invention was completed.

Specifically, the present invention
A method of removing a laminate resin from a laminated aluminum scrap material or a laminated aluminum can laminated with polyethylene terephthalate or a modified product thereof on a surface,
A step (A) of cutting a pressed product formed by pressing the laminated aluminum scrap material or the laminated aluminum can so that an apparent bulk density is 0.3 g / cm ³ or less;
The pressed product opened in the step (A) is heated at 350 ° C. to 660 ° C. in the rotary heating furnace while supplying heated air whose volume supply amount per minute is 4 to 24 times the volume of the rotary heating furnace. And a step (B) of performing a heat treatment at a temperature not higher than ° C. (Claim 1). By cutting the pressed product and heat-treating it in an oxygen atmosphere in a state where the apparent bulk density is lowered, it becomes possible to thermally decompose the laminate resin inside the pressed product having a complicated shape.

When the resin laminating aluminum is PET or a modified product thereof (for example, polybutylene terephthalate (PBT), or a copolymer of PET and PBT), the temperature of the step (B) is 350 ° C. or higher and 660 ° C. Ru der below. If it is less than 350 ° C., it takes time to decompose the PET or its modified product, while if it exceeds 660 ° C., aluminum is melted.

Temperature prior Symbol step (B) shall be 450 ° C. or higher 550 ° C. or less. By setting the temperature to 450 ° C. or higher, even a laminate resin inside a pressed product having a complicated shape can be decomposed in a short time. Moreover, by setting it as 550 degrees C or less, the oxide film formation on the aluminum surface can be prevented and an aluminum recovery rate can be improved.

The step (B) is intends row by supplying heated air in a rotary furnace. This is because the rotary heating furnace can heat-treat the pressed product that has been cut into the furnace while stirring, so that the pressed product can be uniformly heat-treated. In addition, if a method of supplying heated air is employed as a heating method, the amount of supplied oxygen can be controlled without changing the furnace temperature, and the inside of the furnace can always be maintained in an oxygen atmosphere.

The volume supply amount of heated air per minute is set to be not less than 4 times and not more than 24 times the internal volume of the rotary heating furnace. If it is less than 4 times, the decomposition of the laminate resin may be insufficient, and if it exceeds 24 times, it is difficult to increase the decomposition of the laminate resin, so the energy of the heating air supply fan and the air heating device is wasted. Because.

The present invention also provides a step (C) of removing the laminate resin of the press product using the method for removing a laminate resin according to claim 1 and a press product from which the laminate resin has been removed in the step (C). And a step (D) of melting the pressed product by heating it at a temperature of 700 ° C. or higher and 900 ° C. or lower in a low oxygen atmosphere. Recycling method (Claim 2 ).

  The method for removing a laminate resin of the present invention can solve the problems of the prior art, and can effectively decompose and remove the laminate resin in a short time from a laminated aluminum scrap material or a pressed product of a laminated aluminum can.

  Embodiments of the present invention will be described below with reference to the drawings as appropriate. The present invention is not limited to these.

  FIG. 1 is a schematic configuration diagram of an apparatus A used for executing a laminate resin removing method according to an embodiment of the present invention. The concept of the laminate resin removing method of the present invention will be described with reference to FIG.

  The apparatus A includes an opening machine 2, a heating device 6, and a heating furnace 4. The sheet cutting machine 2 is for cutting a pressed product. The heating device 6 is for heating the air 7. The heating furnace is for heat-treating the cut pressed product with heated air. By this apparatus A, the laminated resin is removed from the laminated aluminum scrap material or laminated aluminum can whose surface is laminated with a resin film. Specifically, the process of removing the laminate resin is as follows.

  First, the laminated aluminum scrap material or the laminated aluminum can is pressed by a press machine and becomes a pressed product 1 compressed so as to be easily transported.

Next, the press product 1 is cut by the cutting machine 2 before the heat treatment. At this time, the apparent bulk density is controlled to 0.3 g / cm ³ or less.

  Next, the cut press product 3 is put into the heating furnace 4. In the heating furnace 4, heated air 5 heated by a heating device 6 to a temperature not lower than the decomposition temperature of the laminate resin and not higher than the melting point of aluminum is introduced.

  Note that the heating furnace 4 may have the function of the cutting machine 2, and the cutting process of the press product 1 may be performed in the heating furnace 4 after the press product 1 is put into the heating furnace 4. That is, the opening process and the heat treatment process of the press product 1 may be performed in the same apparatus.

  The pressed product 3 in the heating furnace 4 is heated in an oxygen atmosphere, and the laminate resin on the aluminum surface is thermally decomposed. After being heated for a predetermined time, the aluminum scrap material 8 is discharged from the heating furnace 4. In addition, although either a continuous type or a batch type can be used as the heating furnace 4, a continuous type is preferable from the viewpoint that it can be continuously processed in a large amount.

  Here, as the sheet cutter 2, a known device such as a crusher or a crusher can be used.

  The concept of the method for removing a laminate resin of the present invention has been described above with reference to FIG.

  FIG. 2 is an external view of the rotary heating furnace 10. As the heating furnace 4 in FIG. 1, the rotary heating furnace 10 in FIG. 2 can be employed. In FIG. 2, a part of the furnace wall is broken for easy understanding of the configuration inside the furnace.

  The rotary heating furnace 10 includes a cylindrical furnace body 16, a processed material inlet 11, a hot air inlet 12, an exhaust outlet 13, an air supply pipe 14, and a processed material outlet 17, and a plurality of ribbon blades inside the furnace main body 16. 18 is provided. The supply pipe 14 is arranged concentrically with the furnace body 16. A plurality of nozzles 15 exist in the supply pipe 14. The treatment object inlet 11, the exhaust outlet 13, and the treatment object outlet 17 communicate with the internal space of the furnace body 16. The hot air inlet 12 communicates with the nozzle 15 via the air supply pipe 14. The furnace body 16 is rotationally driven by a motor via a roller 19. The internal volume of the rotary heating furnace 10 is 250L.

  The heat treatment process executed by the rotary heating furnace 10 is specifically as follows.

  First, about 3 to 5 kg of the pressed product after the crushing process is charged from the processed material inlet 11. This processing amount corresponds to about 10 to 20% of the internal volume of the rotary heating furnace 10. Then, heated air heated to 550 ° C. by the heating device is passed through the hot air inlet 12 into the furnace.

  The heated air is guided to the tips of the plurality of nozzles 15 through the air supply pipes 14 in the furnace, and heats the pressed product after crushing (crushing processed press product 20). Further, in combination with rotating the furnace body 16, it is possible to uniformly heat the pressed product after the crushing treatment.

  The furnace main body 16 rotates around the air supply pipe 12 by driving the roller 19 with a motor. By rotating the furnace main body 16, the crushing processed press product 20 in the furnace is sent from the processed material inlet 11 side to the processed material outlet 17 side, and the pressed product 20 is also moved in the furnace by the scraping and stirring function by rotation. The cut is made and the decomposition of the laminate resin is promoted.

  The heated air discharged from each nozzle 15 is then exhausted from the rotary heating furnace 10 through the exhaust outlet 13.

  The crushing processed press product 20 put into the heating furnace 10 is decomposed and removed while the laminating resin is decomposed while moving in the furnace as described above. It is taken out from the processed product outlet 17 as a material.

  In this rotary heating furnace 10, the processed material (crushing processed press product 20) in the furnace is heated with heated air, so that it is easy to adjust the flow rate vented from the hot air inlet 12. Further, even if the flow rate is adjusted, the temperature in the furnace does not vary. For this reason, it is possible to ensure a sufficient amount of ventilation without lowering the temperature in the furnace and maintain the inside of the furnace in an oxygen atmosphere.

  The heat treatment process executed by the rotary heating furnace 10 has been described above.

  Hereinafter, specific examples of the present embodiment will be shown as examples, and effects thereof will be described with reference to comparative examples. An apparatus as shown in FIGS. 1 and 2 was used for the execution of each example and each comparative example.

[Example 1]
As Example 1, the following operation was performed. Using a biaxial crusher (made by Sanken Engineering Co., Ltd., Model SET-072), press the laminated aluminum scrap material laminated with PET resin (approx. 300 mm per side). The cube was crushed (open cut), and the apparent bulk density was adjusted to 0.10 g / cm ³ . The pressed product after the crushing treatment was put into a rotary heating furnace and heat-treated at 550 ° C. for 10 minutes. The flow rate of the heated air is 24 times the internal volume of the rotary heating furnace 10 per minute.

[Example 2]
As Example 2, the same treatment as Example 1 was performed except that the apparent bulk density of the pressed product was adjusted to 0.25 g / cm ³ .

[Example 3]
As Example 3, the same treatment as in Example 1 was performed except that the heat treatment was performed at 450 ° C. for 30 minutes.

[Example 4]
As Example 4, the same processing as in Example 1 was performed except that the apparent bulk density of the pressed product was adjusted to 0.25 g / cm ³ and heat treatment was performed at 350 ° C. for 60 minutes.

[Example 5]
As Example 5, the same processing as Example 1 was performed except that the volume supply amount of heated air per minute was set to 8 times the internal volume of the rotary heating furnace 10.

[Example 6]
As Example 6, the same processing as Example 1 was performed except that the volume supply amount of heated air per minute was set to four times the internal volume of the rotary heating furnace 10.

[Example 7]
As Example 7, the same treatment as in Example 1 was performed except that the apparent bulk density of the press product was adjusted to 0.3 g / cm ³ .

[Comparative Example 1]
As Comparative Example 1, the same treatment as in Example 1 was performed except that the apparent bulk density of the pressed product was adjusted to 1.0 g / cm ³ .

[Comparative Example 2]
As Comparative Example 2, the same treatment as in Example 1 was performed except that the apparent bulk density of the pressed product was adjusted to 0.5 g / cm ³ .

[Comparative Example 3]
As Comparative Example 3, the same treatment as in Example 1 was performed except that the heat treatment was performed at 300 ° C. for 30 minutes.

[Comparative Example 4]
As Comparative Example 4, the same treatment as in Example 1 was performed except that the heat treatment was performed at 290 ° C. for 60 minutes.

[Comparative Example 5]
As Comparative Example 5, the same processing as in Example 1 was performed except that the volume supply amount of heated air per minute was set to twice the internal volume of the rotary heating furnace 10.

[Comparative Example 6]
As Comparative Example 6, the same treatment as in Example 1 was performed except that the heat treatment was performed at 750 ° C. for 10 minutes.

(Measurement of laminate resin content)
The content of the laminate resin contained in each press product to be heat-treated was measured by the following method. That is, the weight a of the laminated aluminum scrap material before pressing each pressed product is measured, and then immersed in a mixed solvent of m-cresol and tetrachloroethylene (volume ratio 1: 1) at room temperature for 1 hour, The laminated PET resin was completely dissolved. After cleaning the surface with the same mixed solvent, the solvent was removed by drying, and the weight b of the aluminum scrap was measured. The difference (ab) between the weights before and after the dissolution treatment was divided by the weight a of the aluminum scrap material before the treatment to calculate the laminate resin content (ab) / a per unit weight of the aluminum scrap material.

(Calculation of laminate resin removal rate)
Next, the weight x of the press product before the heat treatment was measured, and after the heat treatment and cooled to room temperature, the weight y of the press product after the heat treatment was measured. The difference in weight (xy) before and after heating was divided by the weight x before processing, and the amount of laminate resin removed per unit weight of the pressed product (xy) / x was calculated. And {(xy) / x} ÷ {(ab) / a} × 100 was defined as the laminate resin removal rate (%) by the heat treatment.

  The processing temperature, processing time, apparent bulk density, heating air flow rate and laminate resin removal rate of each example and each comparative example are shown in Table 1 and Table 2, respectively.

From the results of Examples 1 to 3 and 7, the treatment temperature is considered to be the decomposition start temperature of the PET resin in an oxygen atmosphere, 450 ° C or 550 ° C exceeding 300 ° C, the apparent bulk density is 0.3 g / cm ³ or less, heating If the air flow rate is set to 24 times the heating furnace volume per minute, the laminate resin can be almost completely removed from the pressed product by 30 minutes of heat treatment (removal rate of 90% or more). confirmed. In particular, in Examples 1 and 2 in which the treatment temperature was 550 ° C., the laminate resin removal rate reached 100% by the heat treatment for only 10 minutes.

In addition, from the results of Example 4, even when the processing temperature is 350 ° C. and the apparent bulk density of the pressed product is 0.25 g / cm ³ , when the processing time is 60 minutes, the laminate resin removal rate is as high as 70%. It was confirmed.

In addition, from the results of Examples 5 and 6, if the processing temperature is 550 ° C. and the apparent bulk density of the pressed product is 0.10 g / cm ³ , the heating air flow rate is reduced to 4 times the heating furnace volume per minute. Even in this case, it was confirmed that the laminate resin removal rate of 90% or more was achieved in a processing time of only 10 minutes, and the laminate resin of the press product could be almost completely decomposed.

On the other hand, from the results of Comparative Examples 1 and 2, even if the processing temperature is 550 ° C. and the heating air flow rate is 24 times the heating furnace volume per minute, the apparent bulk density of the pressed product can exceed 0.25 g / cm ^3. For example, the laminate resin removal rate in a treatment time of 10 minutes was only 40% or less.

From the results of Comparative Example 3, when the processing temperature is 300 ° C., which is considered to be the decomposition start temperature of the PET resin, the apparent bulk density of the pressed product is 0.10 g / cm ³ , and the heating air flow rate is heated every minute. Even when the internal volume was 24 times and the processing time was 30 minutes, the laminate resin removal rate was only 40%.

  Further, from the result of Comparative Example 4, when the processing temperature is lowered to 290 ° C., which is lower than the decomposition start temperature of the PET resin, the apparent bulk density of the press product and the heating air flow rate are the same as those of Comparative Example 3, Even when the treatment time was 60 minutes, the laminate resin removal rate was only 40%.

  From the result of Comparative Example 5, when the heating air flow rate was reduced to twice the heating furnace volume per minute, even if the other conditions were the same as in Example 1, the laminate resin removal rate was 50%. It was only.

Thus, in the laminate resin removal method of the present invention, it is important to optimize the combination of the processing temperature, the apparent bulk density of the pressed product to be processed, and the heating air flow rate. In some cases, the laminate resin could not be removed by 50% or more. In particular, as in Examples 1 to 3, the apparent bulk density of the pressed product was 0.25 g / cm ³ or less, the treatment temperature was 150 ° C. higher than the decomposition start temperature of the PET resin, and the heating air flow rate was changed per minute. In the case of a combination of 24 times the heating furnace volume, it was possible to completely remove the PET resin, which is a laminate resin, without oxidizing and burning the aluminum scrap in a processing time of 30 minutes or less. .

  In Comparative Example 6, the laminate resin was completely removed, but since the oxide film was formed on the surface of the aluminum scrap material, the weight of the press product after the heat treatment increased, and the laminate resin removal rate was implemented. It seemed to be lower than Example 1. For this reason, this comparative example was judged to be unfavorable for aluminum recycling.

  In the above embodiment, the rotary heating furnace provided with the ribbon blade on the furnace inner wall is used. However, the rotary heating furnace is not limited to this structure, and a rotary heating furnace provided with a paddle blade on the supply pipe may be used. Further, an eccentric shaft may be attached in the longitudinal direction in the center of the furnace, and the eccentric shaft may be provided with a plurality of paddle blades. A rotary heating furnace equipped with either a ribbon blade or a paddle blade may be configured so that the central rotating shaft is rotatably mounted and the rotating shaft is rotated. Conversely, the central shaft is fixed and the furnace itself is fixed. It is good also as a structure which rotates.

  In addition to the heating method for supplying heated air into the furnace, the heating means is provided with a mantle on the outer periphery of the furnace, and the mantle is indirectly heated with a heat medium (for example, an electric heater or a high-temperature gas). You can also By using such an indirect heating method, the furnace temperature can be kept uniform.

  In addition to the rotary heating furnace used in the above embodiment, a pusher type heating furnace and a shuttle type heating furnace can also be used as the heating device, but the rotary heating furnace having the stirring function used in the above embodiment is used. It is particularly preferable to use This is because, as described above, the press product in the furnace can be further cut to increase the removal rate of the laminate resin.

  According to the present invention, the laminate resin is decomposed and removed from the aluminum scrap material or the aluminum can and discharged from the exhaust outlet 13. However, depending on the processing conditions, the laminate resin is not completely decomposed by heating to carbon dioxide or the like. It may be discharged as unburned components such as carbon oxide and resin residues. In this case, by providing a secondary combustion furnace in the subsequent stage of the exhaust outlet 13, it is possible to completely thermally decompose the unburned matter.

  As described above, the method for removing a laminate resin of the present invention is a short time of 30 minutes or less, and without using a special processing apparatus, 70% or more of the resin laminated on the surface of the aluminum scrap material, depending on the conditions. 100% can be removed. Further, in the laminate resin removal method of the present invention, since the laminate resin is thermally decomposed into carbon dioxide or the like, there is no need for the treatment of the laminate resin, which is unprecedented as a method for treating the laminate resin from laminated aluminum scraps and the like. The effect can be expected.

  Furthermore, since the aluminum scrap material from which the laminate resin has been removed according to the present invention hardly forms an oxide film on the surface, aluminum can be recycled with high efficiency. As an example of a specific recycling method, the aluminum scrap material from which the laminate resin has been removed according to the present invention is put into a melting furnace, and in a low oxygen atmosphere, for example, replaced with nitrogen gas, 700 ° C. to 900 ° C. It can be melted by heating and taken out from the melting furnace as an aluminum material. In this aluminum recycling method, the aluminum recovery rate is higher than in the case where the aluminum scrap material treated by the conventional laminate resin removal method is recycled under the same conditions, and the practicality is superior.

  The term “in a low oxygen atmosphere” as used herein means a state where the oxygen concentration is 3% or less, preferably 1% or less. One specific example is an atmosphere of an inert gas such as nitrogen gas. Since the aluminum scrap material is melted in a low-oxygen atmosphere, an oxide film is not formed on the aluminum surface even when the aluminum scrap is melted and recovered as an aluminum material from the melting furnace.

  Moreover, the heating temperature of the melting furnace is set to 700 ° C. or higher in order to melt aluminum scrap partially having an oxide film, and 900 ° C. or lower is a sufficiently high melting temperature for the aluminum scrap. This is because, even when heated to a temperature higher than that, the energy consumption of the melting furnace only increases.

  The method for removing a laminate resin of the present invention is useful as a method for recycling aluminum in a high yield from laminated aluminum scraps or laminated aluminum cans.

It is a figure explaining the concept of the lamination resin removal method of this invention. It is a figure explaining the rotary heating furnace used in embodiment of this invention.

Explanation of symbols

1: Press product 2: Cutting machine 3: Pressed product 4: Cutting furnace 5: Heated air 6: Heating device 7: Air 8: Aluminum scrap material 10 from which the laminate resin has been removed 10: Rotary heating furnace 11: Processed material inlet 12: Hot air inlet 13: Exhaust outlet 14: Supply pipe 15: Nozzle 16: Furnace main body 17: Processed material outlet 18: Ribbon blade 19: Roller 20: Crush processing press product

Claims (2)

A method of removing a laminate resin from a laminated aluminum scrap material or a laminated aluminum can laminated with polyethylene terephthalate or a modified product thereof on a surface,
A step (A) of cutting a pressed product formed by pressing the laminated aluminum scrap material or the laminated aluminum can so that an apparent bulk density is 0.3 g / cm ³ or less;
The pressed product opened in the step (A) is heated at 350 ° C. to 660 ° C. in the rotary heating furnace while supplying heated air whose volume supply amount per minute is 4 to 24 times the volume of the rotary heating furnace. And a step (B) of performing a heat treatment at a temperature of not higher than ° C. The step (C) of removing the laminate resin of the press product using the laminate resin removing method according to claim 1 ;
(D) a step of melting the pressed product by putting the pressed product from which the laminate resin has been removed in the step (C) into a melting furnace and heating it at a temperature of 700 ° C. or higher and 900 ° C. or lower in a low oxygen atmosphere; A method for recycling aluminum scrap material or aluminum cans, characterized by comprising:

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