Methods for recycling aluminum sheets in aluminum composite materials

Abstract

To provide a configuration that enables efficient recycling of aluminum sheets in aluminum composite materials. [Solution] A method for recycling an aluminum plate 1 in an aluminum composite material, in which aluminum has alumina (Al2O3) formed on its surface, by the following simple process, and achieving the above objective. 1. Formation of fragmentary aluminum plates 1 with an average length of 5 mm or less, and generation of plastic lumps 2 with an average particle size of 5 mm or less, by crushing the aluminum composite material. 2. Different effects of electrical or mechanical devices on aluminum plates 1 and plastic blocks 2. 3. Formation of the region of aluminum plate 1, the mixed region of aluminum plate 1 + plastic mass 2 when the degree of action of the electrical or mechanical device 2 is below a predetermined level, and the region of plastic mass 2. 4. Separation of the area of ​​aluminum plate 1 from other areas and recovery of aluminum plate 1.

Description

[Technical Field]

[0001] This invention relates to a method for recycling the outer aluminum plate in an aluminum composite material. [Background technology]

[0002] The aluminum layer forming a predetermined thickness (usually within the range of 0.05 to 0.20 mm) on the outside of the aluminum composite material has aluminum oxide, i.e., alumina (Al2O3), on its surface, but its main component is metallic aluminum.

[0003] Conventionally, the recycling of sheet-shaped aluminum composite materials, i.e., aluminum composite panels, has been achieved by peeling off the outer aluminum layer, as shown in Patent Document 1, for example (Claim 3 and paragraph

[0025] ).

[0004] However, if an aluminum layer is formed in a state that makes it easily peeled off for the purpose of recycling, it is unavoidable that peeling will occur during use of the aluminum composite panel, resulting in a loss of its function as a composite panel.

[0005] To avoid such problems, if an aluminum composite panel that is difficult to peel off is formed, the separation process will inevitably become extremely difficult.

[0006] This type of delamination problem occurs not only with aluminum composite panels, but also with columnar shapes such as polygonal, circular, or elliptical cross-sections in the direction perpendicular to the longitudinal direction, where an aluminum plate supports the inner plastic layer. Furthermore, the aluminum composite material is composed of both aluminum composite panels and columnar shapes. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Patent No. 6032776 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] The present invention aims to provide a configuration that enables efficient recycling of aluminum sheets in aluminum composite materials without relying on delamination. [Means for solving the problem]

[0009] To solve the aforementioned problems, the basic configuration of the present invention is as follows. (1) A method for recycling aluminum sheets in which alumina (Al2O3) has formed on the surface of an aluminum composite material by the following process. 1. By crushing an aluminum composite material, the following processes are performed: generating fragmentary aluminum plates with an average length of 5 mm or less, and generating plastic lumps with an average particle size of 5 mm or less. 2. Installation of one electrode plate and ground plate having a predetermined height, and application of a voltage to the one electrode plate such that the metallic aluminum becomes charged to the same polarity when metallic aluminum is present in the space between it and the ground plate. 3. The aluminum plate and plastic chunks crushed by process 1 are dropped into the space between the one-side electrode plate and the ground plate, the aluminum plate is charged by the one-side electrode during the dropping process and moves toward the ground plate due to the repulsive effect with the one-side electrode plate based on the charging, and a region of aluminum plate is formed at each of the dropping end positions, a mixed region of aluminum plate + plastic chunks is formed when the applied voltage of process 2 is below a predetermined level, and a region of plastic chunks is formed. 4. Separation of the aluminum plate area from other areas and recovery of the aluminum plate. (2) A method for recycling aluminum sheets in which alumina (Al2O3) has formed on the surface of an aluminum composite material by the following process. 1. By crushing an aluminum composite material, the following processes are performed: generating fragmentary aluminum plates with an average length of 5 mm or less, and generating plastic lumps with an average particle size of 5 mm or less. 2. Installation of one electrode plate and a ground plate separated by a predetermined horizontal width, and application of a voltage to the one electrode plate such that the metallic aluminum becomes charged to the same polarity when metallic aluminum is present in the space between it and the ground plate. 3. Movement of the crushed aluminum plate and plastic mass between the one-side electrode plate and the ground plate by process 1, and movement toward the ground plate due to repulsion with the one-side electrode plate caused by the charging of the aluminum plate by the one-side electrode during the movement process, formation of an aluminum plate region at each of the end positions of the movement, formation of a mixed region of aluminum plate + plastic mass when the applied voltage of process 2 is below a predetermined level, and formation of a plastic mass region. 4. Separation of the aluminum plate area from other areas and recovery of the aluminum plate. (3) A method for recycling aluminum sheets in which alumina (Al2O3) has formed on the surface of an aluminum composite material by the following process. 1. By crushing an aluminum composite material, the following processes are performed: generating fragmentary aluminum plates with an average length of 5 mm or less, and generating plastic lumps with an average particle size of 5 mm or less. 2. One or more rotating rollers made of metal with a horizontal rotation axis are installed on one or more one-side electrodes, each positioned at a predetermined distance from the other, and a voltage is applied to the one-side electrodes to such an extent that the rotating rollers become charged with the same polarity, and rotation is achieved in a direction in which the surface of the rotating roller facing the one-side electrode descends. 3. The aluminum plate and plastic chunks crushed by process 1 fall onto the rotating surface of the rotating roller on the side closer to one electrode, the aluminum plate charged with the same polarity by one electrode falls with repulsive force between one electrode and the rotating roller, the plastic chunks fall from the rotating roller, a region of aluminum plate is formed at each of the falling end positions, a mixed region of aluminum plate + plastic chunks is formed when the applied voltage of process 2 is below a predetermined level, and a region of plastic chunks is formed. 4. Separation of the aluminum plate area from other areas and recovery of the aluminum plate. (4) A method for recycling aluminum sheets in which alumina (Al2O3) has formed on the surface of an aluminum composite material by the following process. 1. By crushing an aluminum composite material, the following processes are performed: generating fragmentary aluminum plates with an average length of 5 mm or less, and generating plastic lumps with an average particle size of 5 mm or less. 2. One or more rotating rollers made of metal with a horizontal rotation axis are installed, each positioned at a predetermined distance from one or more electrodes on one side, and a fluid plate is provided around the rotating roller, which descends sequentially from the vertical center on the electrode surface side or a position above or near the center, along the rotating roller to a position closer to the one-side electrode at a predetermined distance from the horizontal center on the lower side of the rotating roller, with the area near the upper end inclined away from the rotating roller. A voltage is applied to the one-side electrode to such an extent that the rotating roller becomes charged with the same polarity, and rotation is achieved in a direction in which the surface of the rotating roller facing the one-side electrode rises. 3. The aluminum plate and plastic chunks crushed by process 1 fall from the gap between one electrode and the rotating roller into the fluid plate in an amount sufficient to form a gap between them and the rotating roller, the aluminum plate charged with the same polarity by the one electrode moves upward within the fluid plate due to the electric field formed by the rotating surface of the rotating roller, moves upward from the fluid plate, and then falls, the plastic chunks fall from the fluid plate, a region of aluminum plate is formed at each of the above falling end positions, the mixed region of aluminum plate + plastic chunks that fell from the fluid plate is formed at a position closer to the one electrode than the horizontal center position of the rotating roller by setting a predetermined distance in process 2 when the applied voltage of process 2 is below a predetermined value, and the region of plastic chunks that fell from the fluid plate is formed at a position closer to the one electrode than the horizontal center position of the rotating roller by setting a predetermined distance in process 2. 4. Recovery of aluminum plates in areas of aluminum plates that have already been separated from other areas. (5) A method for recycling aluminum sheets in which alumina (Al2O3) has formed on the surface of an aluminum composite material by the following process. 1. By crushing an aluminum composite material, the following processes are performed: generating fragmentary aluminum plates with an average length of 5 mm or less, and generating plastic lumps with an average particle size of 5 mm or less. 2. Installation of a rotating cylinder having a surrounding wall with one or more discharge holes in the inner cavity. 3. The dropping of aluminum plates and plastic lumps into the rotating cylinder, and the dropping of aluminum plates and plastic lumps with different discharge distances as they are discharged to the outside of the rotating cylinder through the discharge holes by centrifugal force, the formation of aluminum plate regions at each of the aforementioned dropping positions, the formation of mixed aluminum plate + plastic lump regions when the centrifugal force is below a predetermined level, and the formation of plastic lump regions. 4. Separation of the aluminum plate area from other areas and recovery of the aluminum plate. (6) A method for recycling aluminum sheets in which alumina (Al2O3) has formed on the surface of an aluminum composite material by the following process. 1 Generation of flaky aluminum plates with an average length of 5 mm or less and generation of plastic blocks with an average particle size of 5 mm or less by crushing the aluminum composite material. 2 Installation of a rotating column provided with one or more collision plates on the outer periphery. 3 Rotation of the rotating column, collision of the aluminum plate and the plastic block with the collision plate caused by falling onto the rotating column side, and falling of the aluminum plate and the plastic block scattered by the collision in a state with a difference in scattering distance, and formation of the area of the aluminum plate at each of the falling positions, formation of a mixed area of the aluminum plate + plastic block when the impact force by the collision is below a predetermined value, and formation of the area of the plastic block. 4 Separation of the aluminum plate from other areas of the area and recovery of the aluminum plate. (7) A method for recycling an aluminum plate having alumina (Al2O3) formed on its surface in an aluminum composite material by the following process. 1 Generation of flaky aluminum plates with an average length of 5 mm or less and generation of plastic blocks with an average particle size of 5 mm or less by crushing the aluminum composite material. 2 Installation of a blower or a screw for flowing the aluminum plate and the plastic block. 3 Falling of the aluminum plate and the plastic block near the front side of the rotating surface of the blower or the screw, further flowing due to the wind pressure caused by the rotation of the blower or the screw, formation of the area of the aluminum plate at the falling position in a state with a difference in the flowing distance of the aluminum plate and the plastic block, formation of a mixed area of the aluminum plate + plastic block when the wind pressure by the blower or the screw is below a predetermined value, and formation of the area of the plastic block. 4 Separation of the area of the aluminum plate from other areas and recovery of the aluminum plate.

[0010] In addition, in the aluminum composite material, the aluminum layer is usually formed on both outer sides of the plastic layer in the case of an aluminum composite plate, but in the case of a columnar shape, the aluminum layer usually forms a state surrounding the entire outer periphery of the plastic layer.

Advantages of the Invention

[0011] In basic configurations (1), (2), (3), (4), (5), (6), and (7), the aluminum plate can be efficiently recycled through a simple process that includes grinding the aluminum composite material without peeling the aluminum layer, moving the aluminum plate and plastic mass in a device where their electrical or mechanical actions are different, separating the area of the aluminum plate formed by this movement from the areas of the aluminum plate + plastic mass and the plastic mass, and recovering the aluminum plate.

[0012] Moreover, in basic configurations (1), (2), (3), (4), (5), (6), and (7), embodiments that also enable the recycling of the plastic mass can be adopted, as will be described later.

Brief Description of the Drawings

[0013] [Figure 1] It is a vertical cross-sectional view explaining the operation of the device related to Process 2 and Process 3 in basic configuration (1). Here, × indicates the aluminum plate, and the spots indicate the plastic mass, which is the same in the following figures. Regarding the plan view of each area formed by the aluminum plate and the plastic mass, it is the same as the plan view in Fig. 6, so it is omitted. [Figure 2] It explains the operation of the device related to Process 2 and Process 3 in basic configuration (2). (a) shows a cross-sectional view along the moving direction of the aluminum plate and the plastic mass, and (b) shows a cross-sectional view in a direction orthogonal to the moving direction of the aluminum plate and the plastic mass along the A-A direction of (a). Regarding the plan view of each area formed by the aluminum plate and the plastic mass, it is the same as the plan view in Fig. 6, so it is omitted. [Figure 3]This is a vertical cross-sectional view illustrating the apparatus for process 2 and the operation of process 3 in the basic configuration (3). (a) shows the case where one rotating roller is used, and (b) shows an embodiment in which multiple (3) rotating rollers are used and a fluid plate is installed. The plan views of each region made of aluminum plate and plastic block are the same as the plan view in Figure 6 and are therefore omitted. [Figure 4] This is a vertical cross-sectional view illustrating the apparatus for process 2 and the operation of process 3 in the basic configuration (4), where (a) shows the case where one rotating roller is used, and (b) shows the case where multiple (two) rotating rollers are used. The plan views of each region made of aluminum plate and plastic block are the same as the plan view in Figure 6 and are therefore omitted. [Figure 5] The basic configuration (5) describes the apparatus for process 2 and the operation of process 3. (a) shows a vertical cross-sectional view of the rotating cylinder containing the aluminum plate and plastic mass, (b) shows a horizontal cross-sectional view of the rotating cylinder containing the aluminum plate and plastic mass, (c) shows a plan view of the state in which the aluminum plate and plastic mass have scattered and fallen, and (d) shows a plan view of an embodiment in which a mixed area of ​​aluminum plate + plastic mass is not formed. [Figure 6] The basic configuration (6) describes the apparatus for process 2 and the operation of process 3, with (a) showing a side view along the longitudinal direction of the rotating column, (b) showing a vertical side cross-sectional view showing the state in which the collision plate of the rotating column collides with the falling aluminum plate and plastic chunks while rotating, (c) showing a plan view of the location where the scattered aluminum plate and plastic chunks fell, and (d) showing a plan view of an embodiment in which a mixed area of ​​aluminum plate + plastic chunks is not formed. [Figure 7]The basic configuration (7) describes the apparatus related to process 2 and the operation of process 3. (a) shows a side cross-sectional view of the entire configuration along the direction of movement of the aluminum plate and the plastic mass, (b) shows a plan view of the position where the aluminum plate and the plastic mass have fallen, and (c) shows a plan view of an embodiment in which a mixed region of aluminum plate + plastic mass is not formed. [Figure 8] A side view showing the difference in movement speed between an aluminum plate and a plastic block, where (a) shows the case of horizontal movement and (b) shows the case of vertical drop. [Modes for carrying out the invention]

[0014] The following describes the basic configurations (1) to (7) in accordance with the embodiments.

[0015] Basic configuration (1) is a method for recycling an aluminum plate 1, which has alumina (Al2O3) formed on its surface, in an aluminum composite material, by the following process. 1. By crushing an aluminum composite material, the following is achieved: the generation of fragmentary aluminum plates 1 with an average length of 5 mm or less, and the generation of plastic lumps 2 with an average particle size of 5 mm or less. 2. As shown in Figure 1, the installation of a one-sided electrode plate 11 and a ground plate 12 having a predetermined height, and the application of a voltage to the one-sided electrode plate 11 such that the metallic aluminum becomes charged to the same polarity when metallic aluminum is present in the space between it and the ground plate 12. 3. As shown in Figures 1 and 6(c), the crushed aluminum plate 1 and plastic mass 2 produced by process 1 are dropped into the space between the one-side electrode plate 11 and the ground plate 12, the aluminum plate 1 is charged by the one-side electrode 11 during the dropping process and moves toward the ground plate 12 due to the repulsive effect with the one-side electrode plate 11 based on the charging, and a region of aluminum plate 1 is formed at each of the dropping end positions, a mixed region of aluminum plate 1 + plastic mass 2 is formed when the applied voltage of process 2 is below a predetermined level, and a region of plastic mass 2 is formed. 4. Separation of the aluminum plate 1 region from other regions and recovery of the aluminum plate 1.

[0016] The basic configuration (1) is based on the fact that the aluminum plate 1 becomes charged with the same polarity (usually positive polarity due to a positive potential) by the electrode 11 on one side, causing the aluminum plate 1 to repel the electrode 11 on one side and move towards the ground plate 12 side.

[0017] Such charging occurs because an electric field is formed between the one-side electrode 11 and the ground plate 12, causing a charge with the same polarity as the one-side electrode 11 to form on the surface of the conductive aluminum plate 1, and this is also true for the basic configurations (2), (3), and (4). Furthermore, the formation of the aforementioned charge is evident from the fact that, given that the dielectric constant of air is ε0, the electric field is E, the electric flux density is D, and the charge density on the surface of the aluminum plate 1 is ρ, the equation D = ε0E holds true, and that one of Maxwell's equations, divD = ρ, also holds true.

[0018] In contrast, the plastic mass 2, being an organic material, functions as a capacitor with a predetermined capacitance and can be charged with both positive and negative charges. Therefore, it cannot move toward the ground plate 12 due to repulsion toward the electrode 11 on one side, and this is also true for the basic configurations (2), (3), and (4). However, during the fall, it is unavoidable that a portion of the plastic mass 2 will float horizontally.

[0019] Due to the movement of the aluminum plate 1 and the swimming of the plastic mass 2, in process 3, the region of the aluminum plate 1, the mixed region of the aluminum plate 1 and plastic mass 2 when the applied voltage in process 2 is below a predetermined level, and the region of the plastic mass 2 are formed in a continuous state.

[0020] In process 1, fragmentary aluminum plates 1 with an average length of 5 mm or less are produced, and plastic lumps 2 with an average particle size of 5 mm or less are produced.

[0021] The purpose and rationale for this is that when the average length of the aluminum plate 1 and the average particle size of the plastic chunks 2 are 5 mm or less, they form a uniform structural unit that facilitates recycling, and this is also true for the basic structures (2), (3), (4), (5), (6), and (7).

[0022] The minimum average length of the aluminum plate 1 and the minimum average particle size of the plastic chunks 2 vary greatly depending on the crushing method, and furthermore, since dust-like aluminum plate 1 and plastic chunks 2 may also be produced, it is impossible to specify the minimum numerical value, and this point is also true for the basic configurations (2), (3), (4), (5), (6), and (7).

[0023] In process 4, the aluminum plate 1 is recycled by separating and recovering the aluminum plate 1 region from the other regions. Such separation and recovery is possible because the aluminum plate 1 region has a greater luster than the other regions, and this is also true for the basic configurations (2), (3), (4), (5), (6), and (7).

[0024] In the basic configuration (1), the applied voltage in process 2 is set in process 3 to such an extent that no mixed region of aluminum plate 1 + plastic mass 2 is formed, as shown in Figure 6(d). This allows for the separation of the plastic mass 2 region from the aluminum plate 1 region, and also enables the recovery and recycling of the plastic mass 2.

[0025] The voltage applied to one electrode 11 that does not form a mixed region of aluminum plate 1 + plastic block 2 should be determined by specific experiments that correspond to the amount and distance traveled by the aluminum plate 1 as it falls. Furthermore, since the plastic block 2 tends to float horizontally as it falls, if the above embodiment is adopted, it is essential to design the device so that the fall distance is less than or equal to a predetermined distance.

[0026] Basic configuration (2) is a method for recycling an aluminum plate 1, which has alumina (Al2O3) formed on its surface, in an aluminum composite material, by the following process. 1. By crushing an aluminum composite material, the following is achieved: the generation of fragmentary aluminum plates 1 with an average length of 5 mm or less, and the generation of plastic lumps 2 with an average particle size of 5 mm or less. 2. As shown in Figures 2(a) and 2(b), the installation of one electrode plate 11 and a ground plate 12 separated by a predetermined horizontal width, and the application of a voltage to the one electrode plate 11 such that the metallic aluminum becomes charged to the same polarity when metallic aluminum is present in the space between it and the ground plate 12. 3. As shown in Figures 2(a), (b) and 6(c), the movement of the crushed aluminum plate 1 and plastic mass 2 between the one-side electrode plate 11 and the ground plate 12 due to process 1, the movement toward the ground plate 12 due to the repulsive effect with the one-side electrode plate 11 caused by the charging of the aluminum plate 1 by the one-side electrode 11 during the movement process, the formation of a region of aluminum plate 1 at each of the movement end positions, the formation of a mixed region of aluminum plate 1 + plastic mass 2 when the applied voltage of process 2 is below a predetermined level, and the formation of a region of plastic mass 2. 4. Separation of the aluminum plate 1 region from other regions and recovery of the aluminum plate 1.

[0027] Basic configuration (2) is also based on charging of the same polarity due to the action of the electrode 11 on one side of the aluminum plate 1, and the repulsive force caused by said charging. However, as the aluminum plate 1 and the plastic block 2 move in the horizontal direction, the movement of the aluminum plate 1 toward the ground plate 12 forms the three types of regions.

[0028] In this embodiment, horizontal movement is typically achieved by dropping the aluminum plate 1 and the plastic mass 2 in front of the rotation surface of a fan or screw 3, thereby causing the aluminum plate 1 and the plastic mass 2 to flow. However, as will be described later in accordance with the basic configuration (6), an embodiment can also be adopted in which the aluminum plate 1 and the plastic block 2 are scattered horizontally by colliding them with the collision plate 61 of the rotating column 6.

[0029] In each of the embodiments described above, the aluminum plate 1 moves to a greater horizontal distance than the plastic block 2, as will be described later in the basic configurations (5), (6), and (7).

[0030] In the basic configuration (2), the voltage applied in process 2 is set in process 3 to such an extent that no mixed region of aluminum plate 1 + plastic mass 2 is created, as shown in Figure 6(d). This allows for the separation of the plastic mass 2 region from the aluminum plate 1 region, and also enables the recovery and recycling of the plastic mass 2.

[0031] In the above embodiment as well, similar to the case of basic configuration (1), the voltage applied to the one-side electrode 11 should be determined by specific experiments that correspond to the amount and distance of the moving aluminum plate 1.

[0032] Basic configuration (3) is a method for recycling an aluminum plate 1, which has alumina (Al2O3) formed on its surface, in an aluminum composite material, by the following process. 1. By crushing an aluminum composite material, the following is achieved: the generation of fragmentary aluminum plates 1 with an average length of 5 mm or less, and the generation of plastic lumps 2 with an average particle size of 5 mm or less. 2. As shown in Figures 3(a) and 3(b), one or more rotating rollers 4 made of metal with a rotational axis 40 in the horizontal direction are installed on one or more one-sided electrodes 11, each at a predetermined distance from the other, and a voltage is applied to the one-sided electrodes 11 such that the rotating rollers 4 become charged with the same polarity, and rotation is achieved in a direction in which the surface of the rotating roller 4 facing the one-sided electrodes 11 descends. 3. As shown in Figures 3(a), (b) and 6(c), the aluminum plate 1 and plastic mass 2 crushed by process 1 fall onto the rotating surface of the rotating roller 4 on the side closer to the electrode 11 on one side, the aluminum plate 1 charged with the same polarity by the electrode 11 falls with repulsion between the electrode 11 on one side and the rotating roller 4, the plastic mass 2 falls from the rotating roller 4, a region of aluminum plate 1 is formed at each of the falling end positions, a mixed region of aluminum plate 1 + plastic mass 2 is formed when the applied voltage of process 2 is below a predetermined level, and a region of plastic mass 2 is formed. 4. Separation of the aluminum plate 1 region from other regions and recovery of the aluminum plate 1.

[0033] In the basic configuration (3), when a voltage is applied to one side electrode 11, the rotating roller 4 and the aluminum plate 1, being conductors, are charged to the same polarity as the one side electrode 11 by the electric field formed at the one side electrode 11. As a result, when the aluminum plate 1 falls onto the rotating surface of the rotating roller 4 on the side of the one side electrode 11, a repulsive force is inevitably generated between the one side electrode 11 and the rotating roller 4. Consequently, the aluminum plate 1 falls in a direction away from the rotating surface of the one side electrode 11 and the rotating roller 4.

[0034] In contrast, in the case of the plastic block 2, which functions as a capacitor, positive and negative charges are formed by the electric field, and as a result, no repulsive force is generated. Therefore, after falling onto the rotating surface of the rotating roller 4 on the side closer to the electrode 11, it falls downward from the rotating surface, and the falling position is not the same as that of the aluminum plate 1.

[0035] However, because the degree of repulsive force between the aluminum plate 1 and the one-sided electrode 11 and rotating roller 4 is not uniform, and because the plastic mass 2 moves horizontally, if the applied voltage of process 2 is below a predetermined level, the aluminum plate 1 and the plastic mass 2 are not separated at the drop position, and a mixed region of aluminum plate 1 + plastic mass 2 is generated.

[0036] As a result, in process 3, at each drop position, a region of aluminum plate 1, a mixed region of aluminum plate 1 + plastic mass 2 when the applied voltage in process 2 is below a predetermined level, and a region of plastic mass 2 are formed.

[0037] In the basic configuration (3), as shown in Figure 3(b), if a fluid plate 41 is installed below each rotating roller 4 and one-side electrode 11, and is inclined downward sequentially from the one-side electrode 11 side toward the rotating roller 4 side, a portion of the aluminum plate 1 will scatter away from the rotating roller 4 at the upper end of the fluid plate 41 and in its vicinity due to the repulsive force of the rotating roller 4, and fall downward, forming an area of ​​the aluminum plate 1.

[0038] In contrast, the plastic mass 2 flows along the fluid plate 41 together with the remaining aluminum plate 1 without scattering away from the rotating roller 4, and as a result forms a mixed region of aluminum plate 1 + plastic mass 2, but the formation region can be narrowed due to the downward fall of a portion of the aluminum plate 1.

[0039] In the basic configuration (3), the applied voltage in process 2 is set in process 3 to such an extent that no mixed region of aluminum plate 1 + plastic mass 2 is formed, as shown in Figure 6(d). This allows for the separation of the plastic mass 2 region from the aluminum plate 1 region, and also enables the recovery and recycling of the plastic mass 2.

[0040] In such embodiments, it is preferable to determine the voltage value of one side electrode 11 by conducting specific experiments that correspond to the amount of movement of the aluminum plate 1 and the position where the aluminum plate 1 detaches from the rotating roller 4 and falls.

[0041] Basic configuration (4) is a method for recycling an aluminum plate 1, which has alumina (Al2O3) formed on its surface, in an aluminum composite material, by the following process. 1. By crushing an aluminum composite material, the following is achieved: the generation of fragmentary aluminum plates 1 with an average length of 5 mm or less, and the generation of plastic lumps 2 with an average particle size of 5 mm or less. 2 As shown in Figures 4(a) and 4(b), one or more metal rotating rollers 4 are installed, each positioned at a predetermined distance from one or more one-side electrodes 11, with the rotational axis 40 being horizontal. A fluid plate 41 is also provided around the rotating roller 4, which extends sequentially downwards from the vertical center position on the electrode surface side, or a position above or near the center position, along the rotating roller 4, to a position closer to the one-side electrode 11 at a predetermined distance from the horizontal center position below the rotating roller 4, with the area near the upper end inclined away from the rotating roller 4. A voltage is applied to the one-side electrode 11 to the extent that the rotating roller 4 becomes charged with the same polarity, and rotation is achieved in a direction in which the surface of the rotating roller 4 facing the one-side electrode 11 rises. 3 As shown in Figures 4(a), (b) and 6(c), the aluminum plate 1 and plastic chunks 2 crushed by process 1 fall into the fluid plate 41 from the gap between the one-sided electrode 11 and the rotating roller 4 in an amount sufficient to form a gap between them and the rotating roller 4, the aluminum plate 1 charged with the same polarity by the one-sided electrode 11 move upward within the fluid plate 41 due to the electric field formed by the rotating surface of the rotating roller 4, move upward from the fluid plate 41 and then fall, the plastic chunks 2 fall from the fluid plate 41, the formation of a region of aluminum plate 1 at each of the above fall end positions, the formation of the mixed region of aluminum plate 1 + plastic chunks 2 that fell from the fluid plate 41 at a position closer to the one-sided electrode 11 than the horizontal center position of the rotating roller 4, depending on the predetermined distance setting of process 2 when the applied voltage of process 2 is below a predetermined value, and the formation of the region of plastic chunks 2 that fell from the fluid plate 41 at a position closer to the one-sided electrode 11 than the horizontal center position of the rotating roller 4, depending on the predetermined distance setting of process 2. 4. Recovery of the aluminum plate 1 in the region of the aluminum plate 1 that has already been separated from other regions.

[0042] Figures 4(a) and 4(b) both show the case where the upper end of the fluid plate 41 is near the lower side of the vertical center of the rotating roller 4, and also show the case where it descends in a sequentially curved state. However, the fluid plate 41 is not limited to such shapes, and a flat, uncurved shape can also be used.

[0043] The predetermined distance from the lower end of the fluid plate 41 that is closer to the one-sided electrode 11 than the horizontal center position of the rotating roller 4 is set such that, when multiple rotating rollers 4 are provided as shown in Figure 4(b), if the fluid plate 41 falls from its lower end to the upper region of the lower rotating roller 4, the falling position will be closer to the one-sided electrode 11 with respect to the horizontal center position. The reason for this is to prevent the formation of an unnecessary falling area and the creation of extra work in separating and recovering the aluminum plate 1, as the falling position from the fluid plate 41 corresponding to the upper rotating roller 4 to the lower rotating roller 4 will be away from the horizontal center position towards the one-sided electrode 11 when multiple rotating rollers 4 are provided as shown in Figure 4(b).

[0044] In process 2, the amount of aluminum plate 1 and plastic mass 2 falling onto the fluid plate 41 is set to such an extent that the descending aluminum plate 1 + plastic mass 2 forms a predetermined gap with the rotating roller 4, as shown in Figures 4(a) and (b). The reason for this is to avoid the plastic mass 2 also scattering upwards along with the aluminum plate 1 when it comes into contact with the rotating roller 4, thereby interfering with the pure formation area of ​​the aluminum plate 1.

[0045] In the basic configuration (4), as in the case of basic configuration (3), the rotating surfaces of the aluminum plate 1 and the rotating roller 4 exhibit the same polarity (usually positive polarity) as the one-sided electrode 11. However, this differs from the basic configuration (3) in that the rotation direction of the surface of the rotating roller 4 facing one side electrode 11 is upward.

[0046] As a result of these differences, a portion of the aluminum plate 1 that falls into the gap between the one-side electrode 11 and the rotating roller 4 falls onto the fluid plate 41, which is provided in a region around the rotating roller 4 that extends from the vertical center position or near the lower side of the center position on the electrode surface side to a position closer to the one-side electrode 11 at a predetermined distance from the horizontal center position of the rotating roller 4. Thereafter, the aluminum plate 1 not only flows within the fluid plate 41 due to the electric field formed by the upper rotating surface of the rotating roller 4, but also rises further from the fluid plate 41 before falling, thereby forming a region of aluminum plate 1.

[0047] The formation of an electric field by the rotating surface of the rotating roller 4, which has an electric charge generated on its surface due to rotation, can be supported by the following Maxwell formula, which holds true when B is the magnetic flux in the air, D is the electric flux, E is the electric field, and i is the current density that generates the magnetic flux B and electric field D. TIFF0007836134000002.tif2744

[0048] To explain in more detail, if the charge density on the rotating surface is ρ and the vector representation of the rotational velocity is ν, then the current density i in vector form is given by i = ρν.

[0049] The magnetic susceptibility of aluminum is 6.1 × 10⁻⁶. -7 cm 3 / g, which is the magnetic susceptibility of iron, 2.18 × 10⁻⁶. 11 cm 3 Compared to / g, 10 -18 Considering that the magnitude is so small, the effect of magnetic flux B can be ignored for aluminum, and the state of B=0 can be simulated. As a result, if the dielectric constant of the gas is ε0, then the equation -ε0·∂E / ∂t=ρν holds true.

[0050] In other words, an electric field E is formed in the same direction as the rotational velocity ν of the rotating surface of the rotating roller 4, while the fact that the left side of the equation is negative indicates that the electric field E gradually decreases over time. Furthermore, if B=0, then rot·E=0 holds true, which indicates that the electric field E does not exhibit a vortex-like rotational shape.

[0051] Not all aluminum plates 1 necessarily detach from the fluid plate 41 and rise. When the applied voltage of process 2 is below a predetermined level, the remaining aluminum plates 1, other than some that have scattered upwards, descend further along the fluid plate 41 together with the plastic mass 2. As a result, even in the basic configuration (4), a mixed region of aluminum plates 1 + plastic is formed. Furthermore, as shown in Figures 4(a) and (b), some of the aluminum plates 1 that scatter upward tend to move within the fluid plate 41 at a position close to the rotating roller 4.

[0052] In contrast, the aluminum plate 1, which descends together with the plastic mass 2 by the flow plate 41, tends to move within the flow plate 41 at a position away from the rotating roller 4, as shown in Figures 4(a) and (b).

[0053] After the plastic mass 2 descends along the flow plate 41, if the applied voltage is below a predetermined level, a portion of it will form a region by mixing with the aluminum plate 1 as described above. However, since it is not affected by the electric field generated by the rotation of the rotating roller 4, the remaining portion will not form a region mixed with the aluminum plate 1 and will instead form a region consisting only of the plastic mass 2.

[0054] Figure 4(a) shows the case where one rotating roller 4 is used, and Figure 4(b) shows the case where multiple (two) rotating rollers 4 are used. When multiple rotating rollers 4 are used, the scattering of the aluminum plate 1 away from the rotation surface of the rotating roller 4 sequentially enhances the formation of a region consisting only of the aluminum plate 1, and the mixed region of aluminum plate 1 + plastic mass 2 can be narrowed.

[0055] In the basic configuration (4), as shown in Figures 4(a) and (b), when the one-sided electrode 11 is set to face both sides and the vicinity of the vertical center position of the rotating roller 4, when the aluminum plate 1 rises further from the fluid plate 41, the degree of repulsive force with the one-sided electrode 11 is reduced compared to when it is set above the vertical center position of the rotating roller 4, as shown in Figures 3(a) and (b). This is because it promotes the upward movement of the aluminum plate 1 away from the rotating roller 4, and therefore this is a preferred embodiment.

[0056] In the basic configuration (4), as shown in Figure 6(c), the voltage applied by process 2 can be set to such an extent that no mixed region of aluminum plate 1 + plastic mass 2 is generated in process 3, thereby separating the region of plastic mass 2 from the region of aluminum plate 1 via the fluid plate 41, and enabling the recovery and recycling of the plastic mass 2.

[0057] The applied voltage at the one-sided electrode 11 should be determined by specific experiments that are appropriate to the amount of aluminum plate 1 that falls onto the fluid plate 41 and to achieve a state in which the aluminum plate 1 does not fall from the lower end of the fluid plate 41. Furthermore, in the above embodiment, the separation can be further enhanced by increasing the rotational speed of the rotating roller 4.

[0058] Basic configuration (5) is a method for recycling an aluminum plate 1, which has alumina (Al2O3) formed on its surface, in an aluminum composite material, by the following process. 1. By crushing an aluminum composite material, the following is achieved: the generation of fragmentary aluminum plates 1 with an average length of 5 mm or less, and the generation of plastic lumps 2 with an average particle size of 5 mm or less. 2. Installation of a rotating cylinder 5 having a surrounding wall with one or more discharge holes 51 in the inner cavity, as shown in Figures 5(a) and (b). As shown in FIGS. 5(a), 5(b), and 5(c), the aluminum plate 1 and the plastic block 2 fall onto the rotating cylinder 5, and the fall is accompanied by a difference in the discharge distance of the aluminum plate 1 and the plastic block 2 discharged to the outside of the rotating cylinder 5 through the discharge hole 51 by centrifugal force. The formation of the region of the aluminum plate 1 at each of the falling positions, the formation of the mixed region of the aluminum plate 1 + plastic block 2 when the centrifugal force is below a predetermined value, and the formation of the region of the plastic block 2. 4 Separation of the region of the aluminum plate 1 from other regions and recovery of the aluminum plate 1.

[0059] The basic configuration (5) is based on the differences in density and shape between the aluminum plate 1 and the plastic block 2.

[0060] Specifically, the density of metallic aluminum is 2.7 g / cm 3 whereas the density of the plastic block 2 is within the range of 0.9 to 2.2 g / cm 3 . Incidentally, the density of polyethylene, which is a lightweight plastic, is at most 0.95 g / cm 3 and the density of fluororesin, which exhibits the maximum density, is 2.2 g / cm 3 .

[0061] Moreover, the plastic block 2 in the aluminum composite material is often a foamed plastic, and in most cases, the density is 1 g / cm 3 or less.

[0062] In such a case, when the aluminum plate 1 and the plastic block 2 are discharged by centrifugal force as in the basic configuration (5), the flow velocity decreases due to the frictional resistance with the air generated during the flow in the air in both cases. However, in the case of the aluminum plate 1 having a larger density, compared with the plastic block 2, in the case of the same volume, the degree of maintaining the inertial force and the kinetic energy is large, so the degree of deceleration generated by the friction with the air is clearly small.

[0063] In addition to these differences in density, the differences in shape between the aluminum plate 1 and the plastic block 2 also result in differences in their scattering distances.

[0064] To explain in more detail, in the case of aluminum plate 1, it is generally flat in shape, and when moving through the air, it moves along the direction of its flatness in order to minimize resistance due to airflow. Therefore, compared to plastic block 2, which is not flat, the degree of resistance due to airflow is lower.

[0065] Due to these differences in density and shape, in the basic configuration (5), as shown in Figure 8(a), the aluminum plate 1 can be scattered further away than the plastic mass 2 by a greater flow velocity. However, when the centrifugal force is below a predetermined level, a mixed region of aluminum plate 1 and plastic mass 2 is formed, as shown in Figure 5(c).

[0066] In the basic configuration (5), as shown in Figure 5(d), an embodiment can be adopted in which the centrifugal force of process 3 is set to such an extent that no mixed region of aluminum plate 1 + plastic mass 2 is created, thereby separating the region of plastic mass 2 from the region of aluminum plate 1, and also enabling the recycling of plastic mass 2.

[0067] In this embodiment, by separating the plastic mass 2 from the aluminum plate 1 without forming a mixed region of the aluminum plate 1 and the plastic mass 2, the recovery and recycling of the plastic mass 2 can be efficiently achieved.

[0068] The degree of centrifugal force in the above embodiment should be determined by specific experiments that correspond to the amount of aluminum plate 1 released and the release distance.

[0069] The basic configuration (6) is a method for recycling an aluminum plate 1, which has alumina (Al2O3) formed on its surface, in an aluminum composite material, by the following process. 1. By crushing an aluminum composite material, the following is achieved: the generation of fragmentary aluminum plates 1 with an average length of 5 mm or less, and the generation of plastic lumps 2 with an average particle size of 5 mm or less. 2. Installation of a rotating column 6 equipped with one or more collision plates 61 around its outer circumference, as shown in Figures 6(a) and (b). 3. As shown in Figures 6(a), (b), and (c), the rotation of the rotating column 6 and the collision of the aluminum plate 1 and plastic block 2 with the collision plate 61 due to their falling toward the rotating column 6, the falling of the aluminum plate 1 and plastic block 2 scattered by the collision with differences in scattering distance, the formation of the aluminum plate 1 region at each of the aforementioned falling positions, the formation of a mixed region of aluminum plate 1 + plastic block 2 when the impact force due to the collision is below a predetermined level, and the formation of the plastic block 2 region. 4. Separation of aluminum plate 1 from the other areas of the region and recovery of aluminum plate 1.

[0070] In basic configuration (6), as shown in Figure 8(a), there is no difference from basic configuration (5) in that it is based on the difference in density and shape between the aluminum plate 1 and the plastic block 2.

[0071] In the basic configuration (6), the rotational speed of the impact plate 61 in process 3 at the impact position is set to such an extent that no mixed region of aluminum plate 1 + plastic mass 2 is created, as shown in Figure 6(d). By adopting an embodiment that separates the region of plastic mass 2 from the region of aluminum plate 1 and also enables the recovery and recycling of the plastic mass 2, efficient recycling of the aluminum plate 1 can be achieved.

[0072] The basic configuration (7) is a method for recycling an aluminum plate 1, which has alumina (Al2O3) formed on its surface, in an aluminum composite material, by the following process. 1. By crushing an aluminum composite material, the following is achieved: the generation of fragmentary aluminum plates 1 with an average length of 5 mm or less, and the generation of plastic lumps 2 with an average particle size of 5 mm or less. 2. As shown in Figure 7(a), a fan or screw 3 is installed to move the aluminum plate 1 and the plastic block 2. 3. As shown in Figures 7(a) and 7(b), the aluminum plate 1 and the plastic mass 2 fall to the vicinity of the front side of the rotating surface of the fan or screw 3, further flow due to wind pressure caused by the rotation of the fan or screw 3, formation of a region of aluminum plate 1 at the fall position due to the difference in the flow distances of aluminum plate 1 and plastic mass 2, formation of a mixed region of aluminum plate 1 + plastic mass 2 when the wind pressure from the fan or screw 3 is below a predetermined level, and formation of a region of plastic mass 2. 4. Separation of the aluminum plate 1 region from other regions and recovery of the aluminum plate 1.

[0073] The basic configuration (7) is also based on the difference in flow distance caused by the difference in density and shape between the aluminum plate 1 and the plastic block 2. The difference in resistance with air due to the difference in density has already been pointed out in the basic configuration (5).

[0074] To further explain the difference in shape, as shown in Figure 7(a), when the aluminum plate 1 falls in front of the rotating surface of the fan or screw 3, as shown in Figure 8(b), the longitudinal direction of the plate is roughly aligned in the vertical direction. As a result, the wind pressure from the fan or screw 3 acts on the plate surface in the vertical direction, contributing to rapid horizontal flow. However, in the stage after horizontal flow has been established, the plate surface of the aluminum plate 1 is roughly aligned in the horizontal direction, as shown in Figure 8(a), achieving a state of low resistance with the air. As a result, it is possible to achieve flow over a significantly longer distance than with the plastic block 2.

[0075] In the basic configuration (7), the air pressure in process 3 is set to such an extent that no area of ​​aluminum plate 1 + plastic mass 2 is created, as shown in Figure 7(c). By adopting an embodiment that separates the area of ​​plastic mass 2 from the area of ​​aluminum plate 1 and also allows for the recovery and recycling of plastic mass 2, both can be efficiently separated and the recycling of plastic mass 2 can be efficiently realized.

[0076] The degree of the aforementioned wind pressure should be determined by specific experiments that correspond to the amount and distance of the flowing aluminum plate 1.

[0077] The following will be explained with reference to an example. [Examples]

[0078] Example 1 is characterized in that, in process 1 of the basic configuration (1), (2), (3), (4), (5), (6), (7), the aluminum plate 1 and the plastic block 2 pass through a filter with a unit dimension of 3 mm, thereby reducing the dimensions of the aluminum plate 1 and the diameter of the plastic block 2 to less than 3 mm.

[0079] These characteristics enable the recycling of aluminum plates 1 of the same dimensions in Example 1.

[0080] Furthermore, in embodiments where both the aluminum plate 1 and the plastic block 2 are recycled, the plastic block 2 can also be recycled in equal-sized pieces. [Examples]

[0081] Embodiment 2 is based on an embodiment in which both the aluminum plate 1 and the plastic mass 2 are recycled without forming a mixed region of the aluminum plate 1 and the plastic mass 2 in the basic configurations (1), (2), (3), (4), (5), (6), and (7). It is characterized in that a container for housing the aluminum plate 1 and a container for housing the plastic mass 2 are installed in the region where the aluminum plate 1 is formed and the region where the plastic mass 2 is formed, respectively.

[0082] By employing such a container, in Example 2, rapid recycling of the aluminum plate 1 and the plastic block 2 is made possible. [Industrial applicability]

[0083] Based on the basic configurations (1), (2), (3), (4), (5), (6), and (7), the present invention enables efficient recycling of aluminum plates through a simple process that involves crushing the plastic without removing the aluminum layer located on the outside, applying different effects to the aluminum plate and plastic mass using electrical or mechanical devices, separating the regions of the aluminum plate from other regions after each region has been formed by the processing, and recovering the aluminum plate. [Explanation of Symbols]

[0084] 1. Aluminum plate 2 Plastic chunks 1 and 2: A situation where aluminum sheets and plastic chunks are mixed together. 11 One-sided electrode 12 Grounding plate 3. Fan or screw 4-rotation roller 40 Rotational center axis 41 Fluidized plate 5 Rotating Cylinder 51 Discharge hole 6 Rotating Columns 61 Collision plate

Claims

1. In aluminum composite materials, alumina (Al ２ O ３ A method for recycling aluminum sheets that have a surface coating () through the following process.

1. By crushing an aluminum composite material, the following processes are performed: generating fragmentary aluminum plates with an average length of 5 mm or less, and generating plastic lumps with an average particle size of 5 mm or less.

2. Installation of a one-sided electrode plate and a ground plate having a predetermined height, and application of a voltage to the one-sided electrode plate such that the metallic aluminum becomes charged to the same polarity when metallic aluminum is present in the space between it and the ground plate.

3. The aluminum plate and plastic chunks crushed by process 1 are dropped into the space between the one-side electrode plate and the ground plate, the aluminum plate is charged by the one-side electrode during the dropping process and moves toward the ground plate due to the repulsive effect with the one-side electrode plate based on the charging, and a region of aluminum plate is formed at each of the dropping end positions, a mixed region of aluminum plate + plastic chunks is formed when the applied voltage of process 2 is below a predetermined level, and a region of plastic chunks is formed.

4. Separation of the aluminum plate area from other areas and recovery of the aluminum plate.

2. The recycling method according to claim 1, characterized in that the applied voltage in process 2 is set to such an extent that no mixed region of aluminum plate + plastic mass is generated in process 3, thereby separating the region of plastic mass from the region of aluminum plate, and also enabling the recovery and recycling of the plastic mass.

3. In aluminum composite materials, alumina (Al ２ O ３ A method for recycling aluminum sheets that have a surface coating () through the following process.

1. By crushing an aluminum composite material, the following processes are performed: generating fragmentary aluminum plates with an average length of 5 mm or less, and generating plastic lumps with an average particle size of 5 mm or less.

2. Installation of one electrode plate and a ground plate separated by a predetermined horizontal width, and application of a voltage to the one electrode plate such that the metallic aluminum becomes charged to the same polarity when metallic aluminum is present in the space between it and the ground plate.

3. Movement of the crushed aluminum plate and plastic mass between the one-side electrode plate and the ground plate in process 1, and movement toward the ground plate due to repulsion with the one-side electrode plate caused by the charging of the aluminum plate by the one-side electrode during the movement process, formation of an aluminum plate region at each of the movement end positions, formation of a mixed region of aluminum plate + plastic mass when the applied voltage of process 2 is below a predetermined level, and formation of a plastic mass region.

4. Separation of the aluminum plate area from other areas and recovery of the aluminum plate.

4. The recycling method according to claim 3, characterized in that the voltage applied in process 2 is set to such an extent that no mixed region of aluminum plate + plastic mass is generated in process 3, thereby separating the region of plastic mass from the region of aluminum plate, and also enabling the recovery and recycling of the plastic mass.

5. In aluminum composite materials, alumina (Al ２ O ３ A method for recycling aluminum sheets that have a surface coating () through the following process.

1. By crushing an aluminum composite material, the following processes are performed: generating fragmentary aluminum plates with an average length of 5 mm or less, and generating plastic lumps with an average particle size of 5 mm or less.

2. One or more rotating rollers made of metal with a horizontal rotation axis are installed on one or more one-side electrodes, each positioned at a predetermined distance from the other, and a voltage is applied to the one-side electrode to such an extent that the rotating rollers become charged with the same polarity, and rotation is achieved in a direction in which the surface of the rotating roller facing the one-side electrode descends.

3. The aluminum plate and plastic chunks crushed by process 1 fall onto the rotating surface of the rotating roller on the side closer to one electrode, the aluminum plate charged with the same polarity by one electrode falls with repulsive force between one electrode and the rotating roller, the plastic chunks fall from the rotating roller, a region of aluminum plate is formed at each of the falling end positions, a mixed region of aluminum plate + plastic chunks is formed when the applied voltage of process 2 is below a predetermined level, and a region of plastic chunks is formed.

4. Separation of the aluminum plate area from other areas and recovery of the aluminum plate.

6. The recycling method according to claim 5, characterized in that the applied voltage in process 2 is set to such an extent that no mixed region of aluminum plate + plastic mass is generated in process 3, thereby separating the region of plastic mass from the region of aluminum plate, and also enabling the recovery and recycling of the plastic mass.

7. In aluminum composite materials, alumina (Al ２ O ３ A method for recycling aluminum sheets that have a surface coating () through the following process.

1. By crushing an aluminum composite material, the following processes are performed: generating fragmentary aluminum plates with an average length of 5 mm or less, and generating plastic lumps with an average particle size of 5 mm or less.

2. One or more rotating rollers made of metal with a horizontal rotation axis are installed, each positioned at a predetermined distance from one or more electrodes on one side, and a fluid plate is provided around the rotating roller, which descends sequentially from the vertical center on the electrode surface side or a position above or near the center, along the rotating roller to a position closer to the one-side electrode at a predetermined distance from the horizontal center on the lower side of the rotating roller, with the area near the upper end inclined away from the rotating roller. A voltage is applied to the one-side electrode to such an extent that the rotating roller becomes charged with the same polarity, and rotation is achieved in a direction in which the surface of the rotating roller facing the one-side electrode rises.

3. The aluminum plate and plastic chunks crushed by process 1 fall from the gap between one electrode and the rotating roller into the fluid plate in an amount sufficient to form a gap between them and the rotating roller, the aluminum plate charged with the same polarity by the one electrode moves upward within the fluid plate due to the electric field formed by the rotating surface of the rotating roller, moves upward from the fluid plate, and then falls, the plastic chunks fall from the fluid plate, a region of aluminum plate is formed at each of the above falling end positions, the mixed region of aluminum plate + plastic chunks that fell from the fluid plate is formed at a position closer to the one electrode than the horizontal center position of the rotating roller by setting a predetermined distance in process 2 when the applied voltage of process 2 is below a predetermined value, and the region of plastic chunks that fell from the fluid plate is formed at a position closer to the one electrode than the horizontal center position of the rotating roller by setting a predetermined distance in process 2.

4. Recovery of aluminum plates in areas of aluminum plates that have already been separated from other areas.

8. The recycling method according to claim 7, characterized in that the voltage applied in process 2 is set to such an extent that no mixed region of aluminum plate + plastic mass is generated in process 3, thereby separating the region of plastic mass from the region of aluminum plate via a fluidized plate, and also enabling the recovery and recycling of the plastic mass.

9. In an aluminum composite material, a method for recycling an aluminum plate having alumina (Al ２ O ３ ) formed on its surface by the following process.

1. By crushing an aluminum composite material, the following processes are performed: generating fragmentary aluminum plates with an average length of 5 mm or less, and generating plastic lumps with an average particle size of 5 mm or less.

2. Installation of a rotating cylinder having a surrounding wall with one or more discharge holes in the inner cavity.

3. The dropping of aluminum plates and plastic lumps into the rotating cylinder, and the dropping of aluminum plates and plastic lumps with different discharge distances as they are discharged to the outside of the rotating cylinder through the discharge holes by centrifugal force, the formation of aluminum plate regions at each of the aforementioned dropping positions, the formation of mixed aluminum plate + plastic lump regions when the centrifugal force is below a predetermined level, and the formation of plastic lump regions.

4. Separation of the aluminum plate area from other areas and recovery of the aluminum plate.

10. The method for recycling aluminum plates according to claim 7, characterized in that the centrifugal force in process 3 is set to such an extent that no mixed region of aluminum plates and plastic clumps is created, thereby separating the region of plastic clumps from the region of aluminum plates, and also enabling the recovery and recycling of the plastic clumps.

11. In aluminum composite materials, alumina (Al ２ O ３ A method for recycling aluminum sheets that have a surface coating () through the following process.

1. By crushing an aluminum composite material, the following processes are performed: generating fragmentary aluminum plates with an average length of 5 mm or less, and generating plastic lumps with an average particle size of 5 mm or less.

2. Installation of a rotating column equipped with one or more collision plates around its outer circumference.

3. The rotation of the rotating column and the collision of the aluminum plate and plastic mass with the collision plate caused by the aluminum plate and plastic mass falling toward the rotating column, the falling of the aluminum plate and plastic mass scattered by the collision with differences in scattering distance, the formation of an aluminum plate region at each of the aforementioned falling positions, the formation of a mixed region of aluminum plate + plastic mass when the impact force due to the collision is less than a predetermined amount, and the formation of a plastic mass region.

4. Separation of the aluminum plate from the other areas and recovery of the aluminum plate.

12. The method for recycling aluminum plates according to claim 11, characterized in that the rotational speed at the collision position of the collision plate in process 3 is set to such an extent that a mixed region of aluminum plate + plastic mass does not occur, thereby separating the region of plastic mass from the region of aluminum plate, and also enabling the recovery and recycling of the plastic mass.

13. In aluminum composite materials, alumina (Al ２ O ３ A method for recycling aluminum sheets that have a surface coating () through the following process.

1. By crushing an aluminum composite material, the following processes are performed: generating fragmentary aluminum plates with an average length of 5 mm or less, and generating plastic lumps with an average particle size of 5 mm or less.

2. Installation of a fan or screw for moving aluminum plates and plastic blocks.

3. The dropping of aluminum plates and plastic chunks near the front of the rotating surface of a fan or screw, further, the flow caused by wind pressure due to the rotation of the fan or screw, the formation of an aluminum plate region at the dropping position due to the difference in the flow distances of the aluminum plates and plastic chunks, the formation of a mixed region of aluminum plates and plastic chunks when the wind pressure from the fan or screw is below a predetermined level, and the formation of a plastic chunk region.

4. Separation of the aluminum plate area from other areas and recovery of the aluminum plate.

14. The method for recycling aluminum plates according to claim 13, characterized in that the air pressure in process 3 is set to such an extent that no region of aluminum plate + plastic mass is created, thereby separating the region of plastic mass from the region of aluminum plate, and also enabling the recovery and recycling of the plastic mass.

15. A method for recycling aluminum plates according to any one of claims 1, 3, 5, 7, 9, 11, or 13, characterized in that in a stage after process 1, the aluminum plates and plastic chunks pass through a filter with a unit dimension of 3 mm, thereby setting the average length of the aluminum plates and the average particle size of the plastic chunks to less than 3 mm in stage 3.

16. A method for recycling aluminum plates according to any one of claims 2, 4, 6, 8, 10, 12, or 14, characterized in that a container for housing aluminum plates and a container for housing plastic blocks are provided in areas corresponding to the region where aluminum plates are formed and the region where plastic blocks are formed, respectively.

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