JP4271352B2 - Static electricity generator and electrostatic separator for waste plastic containing aluminum - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a static electricity generator that circulates plastic crushed material and / or plastic granular material inside a plastic pipe and stably generates high-voltage static electricity by frictional charging of these two different materials. . Also, waste plastics containing aluminum using static electricity generated by this device, for example, vinyl chloride resin molding material in which aluminum tape is inserted to ensure dimensional stability as automotive materials, etc. The present invention relates to an electrostatic separation method for separating and recovering aluminum from a plastic to recycle and effectively use the plastic.
[0002]
[Prior art]
In general, a molded product of a plastic member with an aluminum tape is used for a molding material or the like used as an automobile window frame member in order to ensure dimensional stability. Industrial waste generated during processing of this molded product, defective waste, and parts generated during dismantling of scrapped vehicles. Waste plastic containing aluminum is difficult to recycle unless aluminum is separated and separated, most of which There was no choice but to incinerate or landfill.
[0003]
However, when such waste is incinerated, it contains aluminum, and therefore it is involved in promoting the production of dioxins, which are harmful substances, causing trouble in the incinerator due to melting adhesion to the furnace body and combustion temperature rise due to oxidation combustion. There is a problem that it is not denied and that it is difficult to dispose of it due to the lack of landfill. Therefore, it is necessary to separate and remove aluminum in order to recycle and recycle plastic from waste plastic containing aluminum. Conventionally, eddy current sorting devices and electrostatic sorting devices, which are electrical sorting devices, are known as devices used to sort nonmagnetic metals such as aluminum from waste plastics containing aluminum.
[0004]
The eddy current sorting device applies a change magnetic field to a conductive object, generates an induced current in the object, and generates an eddy current force by the action of the magnetic field generated by the current and the magnetic field applied from the outside. This is a device for sorting by utilizing the action that a conductive object moves. FIG. 6 shows a conceptual diagram of a drum electrostatic sorter as an electrostatic sorter. A is a grounded metal roll, and B is a metal cylinder placed in parallel to A, and a high voltage is applied. If B is negative, the roll surface is positively charged. Particles entering between AB are polarized by electrostatic induction, generating a negative charge on the side close to the ground roll and a positive charge on the opposite side. If the conductive particles are in contact with the roll, they lose their charge and the whole is positively charged and repelled by the roll. In the case of insulating particles, they do not move, but are attracted to the roll by a negative charge and lose their attraction force outside the electric field and fall. As a result, the conductive particles and the insulating particles are separated and recovered because the drop positions are different.
[0005]
[Problems to be solved by the invention]
However, when the waste plastic containing aluminum is pulverized and the aluminum is selected, the following problems occur and the separation is not sufficient, and the improvement has been strongly demanded. That is, when the eddy current sorting device is used, since the volume of aluminum is small, the eddy current force generated in the magnetic field is weakened and the separation efficiency is not improved. In addition, when performing sorting with an electrostatic sorting device, it is easily affected by humidity and the separation performance is not stable. For this reason, since it is necessary to perform humidity control, a humidity control facility is required, and a device having a dedicated electrode is required, so that the actual cost is high.
[0006]
Conventionally, waste plastic containing aluminum is subjected to a wind separation process to separate lightweight materials mixed in the waste plastic, if necessary, after pulverization, and then the aluminum is separated and removed by a known aluminum separator, and then an extruder. It was melted into pellets and recycled and recycled. When the separation level is low, since a mesh screen is installed in the extruder, foreign matter such as aluminum is removed. However, if the amount of aluminum is large, the mesh screen becomes clogged and the mesh screen is frequently used. Therefore, there is a problem that the extruder cannot be operated normally.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide an electrostatic separation apparatus and a static recovery device for recovering and recycling plastics from which aluminum has been efficiently separated and removed from waste plastics containing aluminum in order to effectively use plastic waste containing aluminum. An electrical separation method is provided. The electrostatic separation apparatus according to the present invention is achieved by combining extremely general-purpose equipment for the business operators involved in plastic recycling, and does not require special drum electrodes or electrical devices, and is inexpensive and compact. Despite being, it is characterized by being able to separate aluminum efficiently.
[0008]
[Means for Solving the Problems]
The present invention includes the following items.
(1) A circulation path connecting blowers, plastic pipes, cyclones, and storage tanks is formed, and inside the circulation path, plastic crushed materials and / or granular materials are placed, and the plastic crushed materials and / or granular materials are circulated. Static electricity generating device characterized by generating static electricity on the surface of plastic piping.
(2) In order to remove the plastic crushed material and / or the fine particles of the granular material circulated through the inside of the circulation path, a cyclone separator as a cyclone is arranged, and further the plastic crushed material circulated under the cyclone separator and / or Or the storage tank for storing a granular material was installed, The static electricity generator as described in (1) characterized by the above-mentioned.
(3) It has an air introduction part which cools the plastic crushed material and / or granular material which circulate between the cyclone separator and the storage tank of the plastic crushed material and / or granular material installed in the lower part. (2) The static electricity generator described in the above.
(4) A position where the metal pipe having an inner diameter larger than the outer diameter of the plastic pipe is extrapolated outside the plastic pipe and is shorter than the length of the plastic pipe, and the metal pipe is decentered. The high-voltage static electricity generation site is formed by placing it in contact with the plastic pipe at a tangential line and concentrating the static electricity generated on the surface of the plastic pipe at the contact portion (1) to The static electricity generator of any one of (3).
(5) Static electricity generated on the surface of a plastic pipe by placing a metal curved or flat plate covering the outer periphery of the plastic pipe so that it contacts the plastic pipe at a tangent line. The electrostatic generator according to any one of (1) to (4), wherein a high-voltage static electricity generation site is formed by concentrating the liquid crystal on the contact portion.
(6) A plurality of protrusions are provided on the outer surface of the plastic pipe, and are arranged so as to be in contact with the metal pipe or the metal curved or flat plate-like body at the top of the protrusion (4) or ( The static electricity generator as described in 5).
(7) The static electricity generator according to any one of (4) to (6), wherein the plastic pipe is made of a vinyl chloride resin.
(8) The static electricity generator according to any one of (1) to (7), wherein the crushed plastic material and / or the granular material uses at least one resin selected from polyethylene terephthalate, polyethylene, and polypropylene.
(9) The static electricity generator according to any one of (4) to (8), wherein an absolute value of the electrostatic voltage is 100,000 volts or more.
(10) Suspended on plastic pipes, or metal pipes installed so as to be in contact with the outer surface of plastic pipes, or metal bent or flat plate-like materials are iron and / or Or it is aluminum, The static electricity generator of any one of (4)-(9) characterized by the above-mentioned.
(11) The static electricity generation device according to any one of (4) to (10), wherein the high voltage static electricity generation site is any one selected from an upper part, a lower part, and a side part of the circulation path.
(12) Supply device for supplying waste plastic containing aluminum that has been crushed to high-voltage static electricity generation sites, aluminum piece collection device for sucking and collecting aluminum pieces blown off by electrostatic repulsion, and separating aluminum The electrostatic separation device according to any one of (4) to (11), wherein a collection container for collecting the removed waste plastic is installed.
(13) A waste plastic containing aluminum that has been pulverized in advance is dropped on the surface of the high-voltage static electricity generation site of the static electricity generation device according to any one of (4) to (12) to charge static electricity. The aluminum piece is blown off by the electrostatic repulsive action generated in the aluminum piece, and the aluminum piece is separated and recovered by providing a collecting device for sucking and collecting the aluminum piece in the area where the aluminum piece is scattered, and at the same time, the aluminum is separated and removed An electrostatic separation method, wherein plastic is collected in a collection container to separate waste plastic from aluminum.
(14) The waste plastic containing aluminum is heat-treated at 30 ° C. to 100 ° C., preferably 30 ° C. to 50 ° C., and then pulverized to a size of 5 mm or less. Electrostatic separation method.
[0009]
The static electricity generator used in the electrostatic separation device of the present invention has a plastic pipe and a plastic crushed material when plastic crushed material and / or plastic granular material of a different material from the plastic pipe is circulated in the plastic pipe. And / or generate | occur | produces high voltage static electricity on plastic piping by friction with a granular material. The combination of the plastic pipe and the material of the recycled plastic crushed material and / or granular material has a higher dielectric constant of the material and the higher the difference in the triboelectric train, the higher the electrostatic voltage generated. Depending on the method, the polarity (positive or negative) of the generated electrostatic voltage can be selected.
[0010]
In order to circulate the plastic crushed material and / or the granular material in the plastic pipe, this apparatus for generating static electricity connects the blower, the plastic pipe, the cyclone, the storage tank of the circulating material, etc. with the piping. Form. This connection is usually preferably made in series. Then, a circulated material such as a crushed plastic material and / or a granular material is put in the circulation path and circulated. It is preferable that the pulverized material such as crushed plastics and / or particulates by this circulation is pulverized to a few hundred μm or less by collision, friction, etc., and separated by a cyclone separator as a cyclone and removed from the circulation path. . Circulating materials such as plastic crushed materials and / or granular materials containing fine powder circulated in the circulation path are introduced into the cylindrical cylinder of the cyclone from the tangential direction, and the finely pulverized materials ascend in the tower. It rises in the air current and is discharged from the top of the cyclone. On the other hand, the circulated product separated from the finely pulverized product collides with the tower wall by centrifugal force and flows down to the storage tank, where it is supplied to the next continuous circulation. Furthermore, when separating the finely pulverized circulating material, an air introduction part for introducing cooling air into the circulation pipe is provided to cool the plastic crushed material and / or the granular material to be circulated, so It is more preferable to prevent blockage in the piping path due to adhesion to the pipe. In the present invention, the circulating speed of the circulating product can be a speed of about 20 m / sec or more and 50 m / sec or less, which is usually used for transferring a plastic pulverized product.
[0011]
As the plastic crushed material and / or the granular material to be circulated in the circulation path, it is most preferable to use one or more kinds of resins composed of polyester resins such as polyethylene terephthalate, polyolefin resins such as polyethylene and polypropylene, etc. Voltage static electricity can be generated. Other plastic types include polystyrene resins such as polystyrene, ABS resins, polymethyl methacrylate resins, acrylate resins such as polymethyl acrylate resins, and polyurethane resins such as polyurethane resins. Depending on the material of the plastic piping part, it is necessary to increase the circulation rate by increasing the circulation speed from the normal speed, for example, 30 m / sec or more and 50 m / sec or less.
[0012]
The crushed plastic crushed material and / or granular material is preferably pulverized or crushed to a particle size of about 1 mm or more and 10 mm or less. More preferably, the particle size is about 3 mm or more and 5 mm or less. However, when using a product whose circulation shape is nearly spherical or using pellets as the circulation product, circulation may be difficult if the particle diameter exceeds about 5 mm. Waste can be crushed or crushed and used as the crushed plastic crushed material and / or granular material, which is preferable because it is inexpensive. When the amount is reduced by fine pulverization due to friction or impact during circulation, it may be replenished every time in order to keep the circulation amount constant.
[0013]
Plastics used as plastic piping for static electricity generators are made of vinyl chloride resin such as vinyl chloride resin, FRP (fiber reinforcement plastic), polypropylene resin, polyolefin resin such as polyethylene resin, etc. Various things can be used. Among these, it is preferable to use a plastic pipe made of vinyl chloride resin because it is easy to select one having an arbitrary pipe diameter, the rigidity of the resin is high, and the cost is low.
[0014]
If plastic crushed materials and / or granular materials are circulated in the circulation path, plastic plastic parts will generate high-voltage static electricity as is, but the static voltage is stable and the absolute value is In order to obtain a high voltage of 100,000 volts or more, the following configuration is preferable. That is, it is set as the structure which extrapolates metal piping to plastic piping, arrange | positions in the position which makes this metal piping eccentric, and contacts with a tangent.
[0015]
For this purpose, either a metal pipe having an inner diameter larger than the outer diameter of the plastic pipe and having a shorter length than the plastic pipe in order to prevent the generated static electricity from being grounded, It is configured by bringing a tangent or one surface of a plastic pipe into contact with a metal pipe. In this way, by concentrating the static electricity generated on the surface of the plastic pipe on the contact part, the fluctuation of the electrostatic voltage can be reduced, and high voltage static electricity can be generated stably. Since the portion can be brought close to a flat surface, it also has an effect of facilitating the electrostatic separation operation described later.
[0016]
Moreover, the following can be used as another aspect which comprises the high voltage static electricity generation | occurrence | production site | part. In other words, a metal curved or flat plate covering a part or all of the outer periphery of the plastic pipe is placed on the plastic pipe so that it contacts the plastic pipe at one tangent line or one surface. The static electricity generated on the surface of the substrate is concentrated on the contact portion. In this way, the shape and direction of the high-voltage static electricity generation site can be freely selected to some extent.
[0017]
Furthermore, if a protrusion is provided on the outer surface of the plastic pipe, the electric charge can be concentrated on the protrusion, particularly the top of the protrusion. Therefore, by setting the protrusion and setting the contact position between the metal member and the plastic pipe The site where static electricity is generated can be set.
[0018]
As described above, the static electricity generation site may be installed at any of the upper part, the lower part, and the side part of the static electricity generation device as long as insulation measures are taken so that the generated static electricity is not grounded.
[0019]
As the metal pipe used in the present invention, it is preferable to use an iron and / or aluminum pipe made of a highly conductive material.
[0020]
When a metal pipe is suspended on a plastic pipe, the distance to the metal pipe is different between the upper and lower parts of the plastic pipe, and the strength of electrolysis increases at the upper part.
[0021]
E = Q / (4πεX ² ------- Formula 1
(Here, E is the electric field strength, X is the distance between the plastic pipe and the metal pipe, Q is the generated charge, and ε is the dielectric constant of the dielectric.)
According to Gauss's theorem expressed by Equation 1, the charge strength increases and the charge concentrates at the pipe contact portion where the distance between the plastic pipe and the metal pipe is small. If the metal pipe is arranged at an eccentric position, the charge concentration occurs. However, when the metal pipe is arranged so as to be in contact with one tangent, the largest charge concentration is achieved. FIG. 5 is a conceptual diagram showing a difference in concentration of electric charges when a metal pipe is suspended on a plastic pipe (a) and when a metal pipe is not suspended (b).
[0022]
The static electricity generated in the high voltage static electricity generating part of the static electricity generator is a high voltage with an absolute value of the electrostatic voltage of 100,000 volts or more, and it is preferable to generate static electricity of 150,000 volts or less in order to avoid discharge.
[0023]
In addition, if waste plastic containing aluminum that has been pulverized in advance is supplied to the high-voltage static electricity generation site in the static electricity generator, the aluminum pieces will come into contact with the static-charged piping and be blown away by electrostatic repulsion. Therefore, the waste plastic from which aluminum has been separated and removed can be efficiently recovered. A device for supplying waste plastic containing pulverized aluminum, an aluminum recovery device for sucking and collecting aluminum pieces, and a recovery container for recovering waste plastic from which aluminum has been separated and removed are attached to the static electricity generation device. An electrostatic separator for separating and removing aluminum from waste plastic containing aluminum is provided.
[0024]
As an example of an apparatus for supplying waste plastic containing aluminum, a waste plastic containing aluminum that has been pulverized in advance is dropped and supplied onto the surface of the high-voltage static electricity generation site where electrostatic separation is performed. A predetermined interval between aluminum and plastic waste is obtained by deviating the adsorption of the objects to be processed by vibration of the vibration plate from a tilted vibration plate provided with a fixed interval, preferably a gap of 3 mm to 5 mm or a screen portion. A device that allows a material having a size less than or equal to the size of the material to pass through the gap or the screen and drop into and contact a member charged with static electricity can be used. An object to be processed having a predetermined size or more, that is, an object to be processed that has not been dropped and supplied from a gap or a sieve portion of a supply device is configured to be recovered from the lower end of a diaphragm that is a supply device. The electrostatic separation is performed after the pulverization process.
[0025]
The aluminum piece in contact with the high-voltage static electricity generation site is charged, and the aluminum piece is bounced off by the electrostatic repulsion effect generated at that time, and is collected by the aluminum piece suction collection device installed in the area where the aluminum piece scatters. The waste plastic from which the aluminum has been separated and removed falls along the metal pipe and is collected in a waste plastic collection container, so that the waste plastic and aluminum are separated. Since the waste plastic from which aluminum has been separated and removed is non-conductive particles, it falls along the metal pipe without generating an electric charge.
[0026]
In addition, waste plastic containing pre-ground aluminum is dropped on the surface of the high-voltage static electricity generating part of the static electricity generator, and the aluminum piece is charged with static electricity. A collection device for sucking and collecting aluminum pieces is provided in the area where aluminum pieces scatter, and the aluminum pieces are separated and collected, and at the same time, the waste plastic from which the aluminum has been separated and removed is collected in a collection container. By separating aluminum and aluminum, there is provided an electrostatic separation method for efficiently recovering plastic from waste plastic containing aluminum.
[0027]
Furthermore, when the object to be subjected to electrostatic separation is heat-treated at 30 ° C. or higher and 100 ° C. or lower, preferably 30 ° C. or higher and 50 ° C. or lower, and then pulverized to a size of 5 mm or less, the separation efficiency of aluminum can be improved. .
[0028]
The particle size of the waste plastic containing aluminum is preferably pulverized to 1 to 5 mm in advance. In a granular material having a size of 1 mm or less, static electricity is larger than gravity, so that it is difficult to recover the plastic component. If the thickness exceeds 5 mm, the interface between aluminum and plastic is less likely to be exposed on the surface of the object to be processed. When a vinyl chloride resin containing aluminum is used as the waste plastic containing aluminum for electrostatic separation, the object to be treated is 30 ° C. or higher and 100 ° C. or lower, preferably 30 ° C. or higher before electrostatic separation. By refining and recycling waste plastics containing aluminum, by reducing the separation performance of aluminum, especially in winter, by grinding to a size of 5 mm or less after heat treatment at 50 ° C. or less Useful.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0030]
FIG. 1 is a configuration diagram showing an embodiment of a static electricity generator that generates static electricity on a plastic pipe that is an electrostatic separator of the electrostatic separator of the present invention.
[0031]
In the figure, reference numeral 1 denotes a portion that generates static electricity, which is a portion used for carrying out electrostatic separation in an electrostatic separation device, and is a plastic pipe. 2 also used plastic piping to form a pipeline. 3 is a blower for circulating plastic crushed material and / or plastic granular material inside the pipe line, and a plastic piping is connected by piping 4 and is made of plastic crushed material and / or plastic granular material in the direction of the arrow. Circulation was circulated. The pipe 4 was made of iron pipe because there was a concern that the plastic crushed material and / or the plastic granular material had a large collision and friction, and the pipe was greatly worn. In the case where the cyclone separator 6 and the storage tank 7 for storing the circulating material are provided below the cyclone separator 6, the tendency of the circulating path to be blocked due to fine powder generated by friction and collision of the circulating material is solved. As a result, the circulation of the circulating material becomes good, and stable high-voltage static electricity can be obtained at the site where high-voltage static electricity is generated on the plastic pipe for performing electrostatic separation. Therefore, fine powder generated by friction and collision of the circulating material was removed from 8. Furthermore, in order to prevent the clogging which may be caused by heating and melting of the circulating material, a storage tank 7 for storing the circulating material having an air introduction part capable of sucking cooling air from the lower part of the cyclone separator 6 was installed.
[0032]
The electrostatic voltage is measured by using a digital electrostatic potential measuring device KSD-0102 or KSD-0103 (manufactured by Kasuga Denki Co., Ltd.), with respect to the plastic pipe 1 and the metal pipe 12 suspended on this. Measurements were taken at a distance of 10 cm.
[0033]
FIG. 2 is a block diagram showing an example of an apparatus for electrostatically separating aluminum from waste plastic containing aluminum using static electricity generated by the apparatus. A plastic chloride pipe 1 (outer diameter 114 mm, thickness 6.6 mm, length 130 cm, Mitsubishi resin Ryo pipe VP100) is used as plastic pipe 1 which is a part for carrying out electrostatic separation, and is made of plastic. A steel pipe 12 (outer diameter 139.8 mm, thickness 4.5 mm, length 100 cm, 125 A pipe) having an inner diameter larger than the outer diameter of the pipe 1 is suspended, and a polyethylene / polyester fiber nonwoven fabric is pulverized 5 mm inside the pipe path. A one-to-one mixture consisting of the following is circulated at a wind speed of 30 m / sec to stably generate a static electricity of −1110,000 volts, and an object obtained by pulverizing a vinyl chloride resin automobile molding material to 5 mm in advance as an object to be processed: From the supply device (vibration feeder) 9 made of an inclined wooden diaphragm installed vertically above the iron pipe 12, the 5 mm provided in the supply device 9 Only the object to be processed that has passed through the gap of 5 mm is installed so as to drop and throw into the pipe 12 that performs electrostatic separation only, and the adsorption of the objects to be processed is solved by the vibration of the diaphragm. Drop into a static-charged pipe and separate it electrostatically. An object to be processed having a predetermined size or larger that does not pass through the gap of the supply device 9 is recovered from the lower end of the diaphragm, and the recovered object is electrostatically separated again after the pulverization process. The aluminum in the object to be processed dropped from the supply device 9 is blown away above the iron pipe 12 by electrostatic repulsion after contact with the iron pipe 12 due to static electricity generated on the iron pipe 12. Aspirated and collected at the suction port 11. The remaining plastic waste from which aluminum has been separated and collected is collected by gravity in a collection container 14 installed below the pipe along the iron pipe.
[0034]
Even when this device is operated in an open building during rainy weather, the electrostatic voltage of the electrostatic separation unit 12 is stably −100,000 V or less, which is favorable from waste of vinyl chloride resin containing aluminum. Aluminum was separated.
The waste plastic containing aluminum was subjected to a wind separation process to separate the lightweight material mixed in the waste plastic as necessary after the pulverization process, and then the aluminum was separated and removed by the electrostatic separation apparatus of the present invention. Then, as a result of melt pelletization with an extruder, regeneration, and recycling, what could not be operated when aluminum was not electrostatically separated was electrostatically separated with the apparatus of the present invention, and 100 mesh in the extruder The aluminum could be removed to a level where steady operation was possible without requiring more than one hour of screen replacement.
[0035]
【The invention's effect】
As described above, according to the present invention, a device capable of stably generating high-voltage static electricity can be configured by combining general-purpose devices. This high-voltage static electricity generator has low fluctuations in separation performance due to humidity and does not require special electrodes or humidity adjustment at the place where separation is performed, unlike conventional devices, so it is inexpensive and has high performance. Can be provided.
[0036]
Moreover, aluminum can be efficiently separated by electrostatic separation from the waste plastic containing aluminum of the present invention. According to the present invention, plastic from which aluminum has been separated and removed is pelletized by an extrusion melting device, so that waste plastic that could not be reused so far can be recycled and recycled, which is useful in terms of effective use of resources. It is.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an apparatus for generating high-voltage static electricity on a plastic pipe that is an electrostatic separation part of an electrostatic separation apparatus according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of an electrostatic separation device according to an embodiment of the present invention.
FIG. 3 is a front view showing details of a separation portion of the electrostatic separation device according to the embodiment of the present invention.
FIG. 4 is a side view showing details of a separation portion of the electrostatic separation device according to the embodiment of the present invention.
FIG. 5 is a conceptual diagram showing a difference in charge distribution between a case where an iron pipe is suspended (a) and a case where it is not suspended (b) in a cross-sectional view of a separation portion of an electrostatic separation device according to an embodiment of the present invention. is there.
FIG. 6 is a conceptual diagram of a conventional drum type electrostatic sorting device.
[Explanation of symbols]
1 Plastic piping, electrostatic separator
2 Plastic piping
3 Blower
4 Piping
5 Air introduction part
6 Cyclone separator
7 Storage tank
8 exhaust section
9 Supply device (vibration feeder)
10 Waste plastic containing separation object and aluminum
11 Suction port
12 Metal piping, separation part
13 Plastic pulverized product (separate)
14 Waste plastic collection container
15 Workpiece
16 Trajectory of insulating particles
17 Trajectory of conductive particles
A Rotating drum electrode
B Electrostatic electrode

Claims (14)

A circulation path connecting blowers, plastic pipes, cyclones, and storage tanks is formed. Inside the circulation path, plastic crushed materials and / or granular materials are placed, and these plastic crushed materials and / or granular materials are circulated to make plastic. Static electricity generator characterized by generating static electricity on the surface of piping. In order to remove the plastic crushed pieces and / or fine powders of the granular material that are circulated through the inside of the circulation path, a cyclone separator as a cyclone is arranged, and further the plastic crushed material and / or the granular material circulated in the lower part of the cyclone separator. The static electricity generator according to claim 1, further comprising a storage tank for storing water. The air introduction part which cools the circulated plastic crushed material and / or a granular material between the cyclone separator and the plastic crushed material and / or granular material storage tank installed in the lower part is characterized by the above-mentioned. Static electricity generator described in the section. Outside the plastic pipe, extrapolate a metal pipe having an inner diameter larger than the outer diameter of the plastic pipe and a length shorter than the length of the plastic pipe, and place the metal pipe at an eccentric position. The high voltage static electricity generation site is formed by bringing the plastic pipe into contact with the plastic pipe and concentrating static electricity generated on the surface of the plastic pipe on the contact portion. The static electricity generator of any one of Claims. Place a metal curved or flat plate covering the outer periphery of the plastic pipe so that it contacts the plastic pipe at a tangent line, and place static electricity generated on the surface of the plastic pipe. The static electricity generator according to any one of claims 1 to 4, wherein a high voltage static electricity generating portion is formed by concentrating on the portion. The plurality of protrusions are provided on the outer surface of the plastic pipe, and the metal pipe or the metal curved or flat plate-like body is disposed so as to be in contact with the top of the protrusion. Static electricity generator. The static electricity generator according to any one of claims 4 to 6, wherein the plastic pipe is made of vinyl chloride resin. The static electricity generator of any one of Claims 1-7 formed by using 1 or more types of resin chosen from polyethylene terephthalate, polyethylene, and a polypropylene as a crushed plastic material and / or a granular material. The static electricity generator according to any one of claims 4 to 8, wherein an absolute value of the electrostatic voltage is 100,000 volts or more. The material of the metal pipe that is suspended on the plastic pipe or in contact with the outer surface of the plastic pipe, or the metal curved or flat plate is made of iron and / or aluminum. The static electricity generator according to claim 4, wherein the static electricity generator is provided. The static electricity generator according to any one of claims 4 to 10, wherein the high-voltage static electricity generation site is any one selected from an upper part, a lower part, and a side part of the circulation path. Supply device for supplying waste plastic containing aluminum that has been crushed to high-voltage static electricity generation sites, aluminum piece collection device for sucking and collecting aluminum pieces blown off by electrostatic repulsion, and disposal after separating and removing aluminum The electrostatic separation apparatus according to claim 4, wherein a collection container for collecting plastic is installed. A waste plastic containing pre-ground aluminum is dropped on the surface of the high-voltage static electricity generation part of the static electricity generation device according to any one of claims 4 to 12, and the static electricity is charged to the aluminum piece. The aluminum repelling action is used to bounce off the aluminum pieces, and in the area where the aluminum pieces are scattered, a recovery device is provided to suck and recover the aluminum pieces, separating and recovering the aluminum pieces, and simultaneously collecting the waste plastic from which the aluminum has been separated and removed An electrostatic separation method characterized in that the waste plastic and aluminum are separated in a container. The waste plastic containing aluminum is heat-treated at 30 ° C to 100 ° C, preferably 30 ° C to 50 ° C, and then pulverized to a size of 5 mm or less. Separation method.

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