JP2002045728A - Static electricity generator and electrostatic separator for aluminum-containing waste plastic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrostatic separator which can efficiently separate and eliminate aluminum from an aluminum-containing waste plastic. SOLUTION: In this static electricity generator, a high-voltage static electricity generation section is formed by forming a circulation route by connecting a plastic-made pipeline, a cyclone separator as a cyclone, a storage vessel, and a blower with a pipeline; inserting the plastic-made pipeline through a metal-made pipeline having an internal diameter larger than the outer diameter of the plastic-made pipeline and having a length smaller than that of the plastic- made pipeline so that the metal-made pipeline is eccentrically arranged to be in line contact with the plastic-made pipeline; circulating a crushed plastic and/or a particulate plastic through the circulation route; and concentrating static electricity generated on the surface of the plastic-made pipeline on the contact part. After an aluminum-containing waste plastic crushed in advance is supplied to and is brought into contact with the high-voltage static electricity generation section, aluminum is sprung out by electrostatic repulsion to be separated and eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention circulates a crushed plastic and / or a granular plastic in a plastic pipe, and stably generates high-voltage static electricity by frictional charging of the two different materials. The present invention relates to a static electricity generator. In addition, by utilizing the static electricity generated by this device, waste plastic containing aluminum, for example, a vinyl chloride resin molding material into which aluminum tape is inserted to ensure dimensional stability as a material for automobiles, etc. The present invention relates to an electrostatic separation method for separating and recovering aluminum from plastics to regenerate plastics for effective use.

[0002]

2. Description of the Related Art In general, as a molding material used as a window frame member for an automobile, a molded product of a plastic member containing an aluminum tape is used in order to secure dimensional stability. Industrial waste and defective waste generated during the processing of this molded article and members generated when dismantling scrapped vehicles.
It is difficult to recycle aluminum-containing waste plastics unless aluminum is separated and separated, and most of them have to be incinerated or landfilled.

However, when such waste is incinerated, it promotes the generation of dioxin, a harmful substance, which contains aluminum and causes troubles in the incinerator due to melting adhesion to the furnace body and an increase in combustion temperature due to oxidative combustion. There is a problem that the involvement of the project has not been denied, and the lack of landfills makes disposal difficult. Therefore, in order to regenerate and recycle plastic from waste plastic containing aluminum, it was necessary to separate and remove aluminum. 2. Description of the Related Art Conventionally, eddy current sorters and electrostatic sorters, which are electrical sorters, are known as devices used to sort nonmagnetic metals such as aluminum from waste plastics containing aluminum.

An eddy current selection device applies a changing magnetic field to a conductive object to generate an induced current in the object, and the eddy current force is generated by the action of a magnetic field generated by the current and a magnetic field applied from the outside. This is a device for sorting by utilizing the effect that a conductive object moves due to the occurrence of FIG. 6 shows a conceptual diagram of a drum electrostatic separator as an electrostatic separator. A is a grounded metal roll, and B is a metal cylinder placed in parallel with A, to which 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 near the ground roll and a positive charge on the opposite side. If the conductive particles come into contact with the roll, they lose their charge and become positively charged as a whole, and are repelled by the roll. In the case of the insulating particles, they do not move, but are attracted to the rolls by the negative charges, and fall off with no attractive force outside the electric field. As a result, the conductive particles and the insulating particles fall at different positions, and are separated and collected.

[0005]

However, in the case where aluminum-containing waste plastic is pulverized to separate aluminum by pulverization, the following problems occur, separation is not sufficient, and improvement thereof is strongly demanded. Was. That is, when the eddy current selection device is used, the volume of aluminum is small, so that the eddy current force generated in the magnetic field is weakened, and the separation efficiency is not improved. Further, when sorting is performed by an electrostatic sorting device, the separation 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 considerably increased.

Conventionally, waste plastics containing aluminum are pulverized, subjected to a wind separation treatment to separate lightweight materials mixed into the waste plastic if necessary, and then separated and removed by a known aluminum separation device. It was melt pelletized by an extruder, regenerated and recycled. When the separation level is low, foreign materials such as aluminum are removed because the mesh screen is installed in the extruder.However, when the amount of aluminum is large, clogging of the mesh screen occurs and frequent mesh screens are formed. Replacement is necessary,
There was a problem that the extruder could not be operated in a steady state.

SUMMARY OF THE INVENTION An object of the present invention is to effectively utilize plastic waste containing aluminum in order to efficiently and highly efficiently separate and remove aluminum from waste plastic containing aluminum. It is to provide an apparatus and an electrostatic separation method. The electrostatic separation device according to the present invention is achieved by combining extremely versatile equipment for the company involved in plastic recycling, and does not require special drum electrodes or electric devices, and is inexpensive and compact. Despite the fact, it is a feature that aluminum can be efficiently separated.

[0008]

Means for Solving the Problems The present invention includes the following items. (1) Form a circulation path connecting the blower, plastic pipe, cyclone, and storage tank, and inside the circulation path,
A static electricity generating apparatus characterized in that a crushed plastic and / or a granular material is put therein, and the crushed plastic and / or the granular material is circulated to generate static electricity on the surface of a plastic pipe. (2) A cyclone separator as a cyclone is disposed in order to remove plastic crushed materials and / or fine particles of particulate matter generated by circulating in the circulation path, and furthermore, plastic crushed materials and / or circulated below the cyclone separator. Alternatively, the static electricity generator according to (1), further comprising a storage tank for storing the particulate matter. (3) Between the cyclone separator and the storage tank of the crushed plastic and / or granular material installed under the cyclone separator,
The static electricity generator according to (2), further comprising an air introduction part for cooling the circulating plastic crushed material and / or granular material. (4) A position where the metal pipe having an inner diameter larger than the outer diameter of the plastic pipe and shorter than the length of the plastic pipe is extrapolated outside the plastic pipe, and the metal pipe is eccentric. (1) to (1) to form a high-voltage static electricity generation site by concentrating static electricity generated on the surface of the plastic pipe at the contact portion by contacting the plastic pipe with a tangential line.
The static electricity generator according to any one of (3). (5) Make contact with the plastic pipe at one tangent,
A high-voltage static electricity generating part is formed by disposing a metal curved or flat plate-like body covering part or all of the outer periphery on a plastic pipe and concentrating static electricity generated on the surface of the plastic pipe to the contact portion. The static electricity generator according to any one of (1) to (4), wherein (6) Provide a plurality of protrusions on the outer surface of the plastic pipe,
The static electricity generating device according to (4) or (5), wherein the static electricity generating device is arranged so as to be in contact with a metal pipe or a metal curved or flat plate-like body at the top of the projection. (7) The static electricity generator according to any one of (4) to (6), wherein the plastic pipe is made of vinyl chloride resin. (8) The crushed plastic and / or the granular material use one or more resins selected from polyethylene terephthalate, polyethylene, and polypropylene (1) to (1).
(7) The static electricity generator according to any one of (1) and (2). (9) The static electricity generator according to any one of (4) to (8), wherein the absolute value of the static voltage is 100,000 volts or more. (10) A metal pipe which is suspended on a plastic pipe or placed so as to be in tangential contact with the outer surface of the plastic pipe, or a material of a metal curved or flat plate-like body is made of iron and / or Or, the static electricity generator according to any one of (4) to (9), which is made of aluminum. (11) The high-voltage static electricity generation site is any one selected from the upper, lower, and side portions of the circulation path (4)-
The static electricity generator according to any one of (10) and (10). (12) The high voltage static electricity generation site was pulverized,
It is equipped with a supply device that supplies waste plastic containing aluminum, an aluminum fragment collection device that sucks and collects aluminum pieces flipped by electrostatic repulsion, and a collection container that collects waste plastic from which aluminum has been separated and removed. The electrostatic separation device according to any one of (4) to (11). (13) A waste plastic containing aluminum previously pulverized is dropped and supplied onto the surface of the high-voltage static electricity generating portion of the static electricity generating device according to any one of (4) to (12) to charge the static electricity. The aluminum piece is flipped off due to the electrostatic repulsion generated on the aluminum piece, and a recovery device is provided for suctioning and recovering the aluminum piece in the area where the aluminum piece scatters, and the aluminum piece is separated and recovered. 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) Waste plastic containing aluminum
30 ° C to 100 ° C, preferably 30 ° C to 50 ° C
(13) The electrostatic separation method according to (13), wherein the heat treatment is performed at a temperature of not more than 0 ° C., and the material is ground to a size of 5 mm or less.

The static electricity generator used in the electrostatic separator according to the present invention is characterized in that when plastic crushed materials and / or plastic particulates made of a material different from that of the plastic pipe are circulated in the plastic pipe, the plastic pipe is connected to the plastic pipe. A high voltage static electricity is generated on a plastic pipe by friction with a crushed plastic and / or a granular material. The combination of the plastic pipe and the material of the circulating plastic crushed material and / or the granular material is such that the higher the dielectric constant of the material and the greater the difference in the triboelectric series, the higher the generated electrostatic voltage. The polarity (positive or negative) of the generated electrostatic voltage can be selected.

This apparatus for generating static electricity connects a blower, a plastic pipe, a cyclone, a storage tank for circulating substances, and the like with a pipe in order to circulate the crushed plastic and / or granular material in the plastic pipe. To form a circulation path. This connection is usually preferably made in series. Then, a circulating material such as a crushed plastic and / or a granular material is put into the circulation path and circulated. By this circulation, it is preferable that a circulating material such as a crushed plastic and / or a granular material, which is pulverized to a size of several hundred μm or less due to collision, friction, or the like, is separated by a cyclone separator as a cyclone and removed from the circulation path. . A circulating material such as a crushed plastic and / or a granular material containing fine powder circulated in the circulation path is introduced from a tangential direction into a cylindrical cylinder of the cyclone, and swirls in the tower to raise the crushed material. It rises in the airflow and is discharged from the top of the cyclone. On the other hand, the separated circulated matter of the finely divided circulated matter collides with the tower wall by centrifugal force, flows down into the storage tank, and is subjected to the next continuous circulation. Further, when separating the finely divided circulating material, an air introduction unit for introducing cooling air into the circulation pipe is provided to cool the crushed plastic and / or granular material to be circulated, thereby melting or blowing by heat. It is more preferable to prevent blockage in the piping route due to adhesion to the pipe. The circulation speed of the circulating material in the present invention is 20 m / sec, which is usually used for the transfer of the pulverized plastic.
A speed of about c to 50 m / sec can be used.

As the crushed plastic and / or granular material circulated in the circulation path, it is most preferable to use at least one kind of a resin composed of a polyester resin such as polyethylene terephthalate and a polyolefin resin such as polyethylene and polypropylene. Preferably, high-voltage static electricity can be generated. As other plastic types, polystyrene resins such as polystyrene, ABS resins, polymethyl methacrylate resins, acrylate resins such as polymethyl acrylate resins, polyurethane resins such as polyurethane resins, and the like can also be used.
Depending on the material of the plastic pipe part, which is a static electricity generating part, the circulation speed may be faster than usual, for example, 30 m / s.
It is necessary to increase the circulation amount, for example, by setting it to ec or more and 50 m / sec or less.

It is preferable that the crushed plastic and / or granular material, which is a circulating material, is crushed 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, in the case where a circulating material having a shape close to a sphere or a pellet is used as the circulating material, circulation may be difficult if the particle size exceeds about 5 mm.
As the plastic crushed material and / or granular material as the circulating material, waste can be crushed or crushed and used, which is preferable because it is inexpensive. If the amount is reduced by fine powdering due to friction or impact during circulation, it may be replenished each time to keep the circulation amount constant.

The plastic used for the plastic piping of the static electricity generator is made of a vinyl chloride resin such as a vinyl chloride resin, a polyolefin resin such as a FRP (fiber reinforced plastic), a polypropylene resin, or a polyethylene resin. Various ones such as those described above can be used. Among these, it is preferable to use a plastic pipe made of a vinyl chloride resin because it is easy to select an arbitrary pipe diameter, the rigidity of the resin is high, and the cost is low.

[0014] The plastic pipe section generates high-voltage static electricity as it is if the crushed plastic and / or particulate matter is circulated in the circulation path. In order to obtain a high voltage having an absolute value of 100,000 volts or more, the following configuration is preferable.
That is, a configuration is adopted in which a metal pipe is extrapolated to a plastic pipe, the metal pipe is arranged at an eccentric position, and the metal pipe is brought into contact with a tangent line.

For this purpose, the inner diameter of the plastic pipe is smaller than that of the plastic pipe because the generated inner diameter is larger than the outer diameter of the plastic pipe and the generated static electricity is not grounded.
Suspend metal pipes on plastic pipes, or
It is constituted by making one tangent line or one surface of the plastic pipe come into contact with the metal pipe. By doing so, the static electricity generated on the surface of the plastic pipe is concentrated on the contact portion, whereby the fluctuation of the static electricity voltage is reduced, and high-voltage static electricity can be generated stably. Since the portion can be made closer to a flat surface, it also has an effect that the operation of electrostatic separation described later becomes easy.

Further, the following can be used as another mode constituting the high-voltage static electricity generating portion. That is,
A metal curved or flat plate that covers a part or all of the outer circumference of the plastic pipe is placed on the plastic pipe so that the plastic pipe is in contact with the plastic pipe at one tangent or one side, and the surface of the plastic pipe is Is concentrated on the contact portion. In this case, the shape and direction of the high-voltage static electricity generating portion can be freely selected to some extent.

Further, when the projection is provided on the outer surface of the plastic pipe, the electric charge can be concentrated on the projection, particularly on the top thereof. Therefore, the installation of the projection and the contact position between the metal member and the plastic pipe are performed. By setting the above, it is possible to set the static electricity generation site.

As described above, the static electricity generating portion may be installed at any of the upper, lower, and side portions of the static electricity generating device if insulation measures are taken so that the generated static electricity is not grounded.

As the metal pipe used in the present invention, it is preferable to use iron and / or aluminum pipe made of a highly conductive material.

When a metal pipe is suspended from a plastic pipe, the distance to the metal pipe is different between the upper part and the lower part of the plastic pipe, and the strength of electrolysis is higher at the upper part.

E = Q / (4πεX ² ) Equation 1 (where E is the strength of the electric field, X is the distance between the plastic pipe and the metal pipe, Q is the generated charge, ε Indicates the dielectric constant of the dielectric.) According to the Gauss's theorem shown in Equation 1, the electric charge strength increases at the pipe contact portion where the distance between the plastic pipe and the metal pipe is small, and the charges are concentrated. If the metal pipe is arranged at a position where the metal pipe is eccentric, 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 between a case where a metal pipe is suspended on a plastic pipe (a) and a case where a metal pipe is not suspended (b).

The static electricity generated at the high-voltage static electricity generating portion of the static electricity generator is a high voltage having an absolute value of the static voltage of 100,000 volts or more.
It is preferable to generate static electricity of 50,000 volts or less.

When a waste plastic containing aluminum which has been pulverized in advance is supplied to a high-voltage static electricity generating portion of the static electricity generating device, the aluminum pieces come into contact with the electrostatically charged pipe portion to cause an electrostatic repulsion action. Therefore, the waste plastic from which aluminum has been separated and removed can be efficiently collected.
The static electricity generating device is provided with a supply device for waste plastic containing crushed aluminum, an aluminum collecting device for sucking and collecting aluminum pieces, and a collecting container for collecting waste plastic from which aluminum has been separated and removed with respect to the static electricity generating device. An electrostatic separation device for separating and removing aluminum from waste plastic containing aluminum by being installed is provided.

As an example of the supply device of the waste plastic containing aluminum, the waste plastic containing aluminum which has been pulverized in advance is dropped on the surface of the high-voltage static electricity generation site where electrostatic separation is performed. Aluminum and plastic waste are released from a fixed interval, preferably a gap of 3 mm or more and 5 mm or less, or an inclined diaphragm provided with a sieve portion, which is provided so as to supply the objects by vibration of the diaphragm. It is possible to use an apparatus that allows an object having a predetermined size or less to pass through the gap or sieve, drop into the electrostatically charged member, and come into contact with the member. The object to be processed having a predetermined size or more, that is, the object to be processed that has not been dropped and supplied from the gap or the sieve portion of the supply device is configured to be recovered from the lower end of the diaphragm as the supply device, and the recovered material is again After the pulverization process, it is electrostatically separated.

The aluminum piece in contact with the high-voltage static electricity generating portion is charged, and the aluminum piece is flipped off by the electrostatic repulsion generated at that time, and is collected by the aluminum piece suction and recovery device provided in the area where the aluminum piece scatters. At the same time, the waste plastic from which aluminum has been separated and removed falls along the metal pipe, and is collected in a waste plastic collection container, whereby the waste plastic and aluminum are separated. Since the waste plastic from which aluminum has been separated and removed is a non-conductive particle, it falls along a metal pipe without generating an electric charge.

Further, a waste plastic containing aluminum, which has been pulverized in advance, is dropped and supplied onto the surface of the high-voltage static electricity generating portion of the static electricity generating device, and the aluminum pieces are charged with static electricity. The aluminum piece is flipped off, and a recovery device for suctioning and recovering the aluminum piece is provided in an area where the aluminum piece scatters, and the aluminum piece is separated and recovered, and at the same time, the waste plastic from which aluminum is separated and removed is recovered in a recovery container. By separating waste plastic and aluminum, an electrostatic separation method is provided in which plastic is efficiently recovered from waste plastic containing aluminum.

Further, the object to be subjected to electrostatic separation is kept at 30 ° C.
After heat treatment at a temperature of not less than 100 ° C., preferably not less than 30 ° C. and not more than 50 ° C., pulverization to a size of not more than 5 mm can improve the separation efficiency of aluminum.

The particle size of the waste plastic containing aluminum is preferably pulverized to 1 to 5 mm in advance. In the case of a powder having a particle size of 1 mm or less, the static electricity is greater than the gravity, and it is difficult to collect the plastic component. If it exceeds 5 mm, the interface between aluminum and plastic is less likely to be exposed on the surface of the object. When a vinyl chloride resin containing aluminum is used as the waste plastic containing aluminum for performing the electrostatic separation, the object to be treated is subjected to a temperature of 30 ° C or more and 100 ° C or less, preferably 30 ° C or more before performing the electrostatic separation. By heat-treating to 50 ° C. or less and then pulverizing to a size of 5 mm or less, especially in winter, it is improved that the separation performance of aluminum is reduced. Useful.

[0029]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an electrostatic generator for generating static electricity on a plastic pipe which is an electrostatic separator of the electrostatic separator of the present invention.

In FIG. 1, reference numeral 1 denotes a portion for generating static electricity, which is a portion used for performing electrostatic separation in an electrostatic separation device, which is a plastic pipe. 2 also formed a pipeline using plastic piping. Reference numeral 3 denotes a blower for circulating plastic crushed materials and / or plastic granules inside the pipeline, and connects a plastic pipe with a pipe 4 and is made of plastic crushed materials and / or plastic granules in the direction of the arrow. Circulation was circulated.
For the pipe 4, iron pipe was used because there was a concern that the plastic crushed material and / or plastic particulate matter would cause a large collision and friction, and that the pipe would be greatly worn. When 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 material to block the circulation path due to the fine powder generated by friction and collision of the circulating material is solved. As a result, the circulation of the circulating material is improved, and stable high-voltage static electricity is obtained at the high-voltage static electricity generating portion on the plastic pipe for performing electrostatic separation. Therefore, fine powder generated by friction and collision of the circulating material was removed from 8. Further, in order to prevent 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 portion through which cooling air can be sucked from a lower portion of the cyclone separator 6 is provided.

The electrostatic voltage is measured using a digital electrostatic potential meter KSD-0102 or KSD-0103 (manufactured by Kasuga Electric Co., Ltd.), and a plastic pipe 1 which is a portion where static electricity is generated and a metal pipe 12 suspended therefrom. 10 for
The measurements were taken at a distance of cm.

FIG. 2 is a block diagram showing an example of an apparatus for electrostatically separating aluminum from waste plastic containing aluminum by utilizing static electricity generated by the above-mentioned apparatus. A pipe made of vinyl chloride resin (outer diameter 114 mm, thickness 6.6 mm, length 130 cm, plastic pipe 1 as a part for performing electrostatic separation)
An iron pipe 12 having an inner diameter larger than the outer diameter of the plastic pipe 1 (the outer diameter 1
39.8mm, thickness 4.5mm, length 100cm, 12
5A pipe) and polyethylene /
One-to-one consisting of 5mm crushed polyester fiber non-woven fabric
Was circulated at a wind speed of 30 m / sec to stably generate −110,000 volts of static electricity, and a vinyl chloride resin automobile molding material was crushed to 5 mm in advance as a treatment object. Supply device (vibration feeder) 9 consisting of an inclined wooden diaphragm installed vertically above
More specifically, only those that pass through the 5 mm gap provided in the supply device 9 are installed so as to be dropped into the piping 12 for performing electrostatic separation,
While dissociating the objects to be processed by the vibration of the diaphragm, 5
Only the object to be processed, which has passed through the gap of 1 mm, is dropped into a statically charged piping section to be separated by static electricity. An object to be processed having a predetermined size or more that has not passed through the gap of the supply device 9 is collected from the lower end of the diaphragm, and the collected object is electrostatically separated again after the pulverizing process. The aluminum in the object to be treated dropped from the supply device 9 is contacted with the iron pipe 12 by static electricity generated on the iron pipe 12, and then is flipped over the iron pipe 12 by electrostatic repulsion, The liquid is sucked 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.

Even when the apparatus is operated in an open building in rainy weather, the static electricity voltage of the electrostatic separation unit 12 is stably less than -100,000 V, and is obtained from waste vinyl chloride resin containing aluminum. Good separation of the aluminum. The aluminum-containing waste plastic was subjected to a wind separation treatment to separate lightweight substances mixed into the waste plastic if necessary after the pulverization treatment, and then the aluminum was separated and removed by the electrostatic separation device of the present invention. Then, as a result of melting and pelletizing by an extruder, regenerating, and recycling, aluminum could not be operated if it was not electrostatically separated. However, by performing electrostatic separation with the apparatus of the present invention, 100 mesh in the extruder was used. The aluminum could be removed to a level where steady operation was possible without the need for screen replacement for more than one hour.

[0035]

As described above, according to the present invention, a device capable of stably generating high-voltage static electricity can be constituted by combining general-purpose devices. This high-voltage static electricity generator, unlike conventional devices, has a small fluctuation in separation performance due to humidity, does not require the use of special electrodes, and does not require humidity control at the place where separation is performed. It is possible to provide a simple processing device.

Further, aluminum can be efficiently separated from the waste plastic containing aluminum of the present invention by electrostatic separation. According to the present invention, a 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 can be reclaimed 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 a device that generates high-voltage static electricity on a plastic pipe that is an electrostatic separation part of an electrostatic separation device 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 illustrating 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 unit 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]

DESCRIPTION OF SYMBOLS 1 Plastic piping and electrostatic separation part 2 Plastic piping 3 Blower 4 Piping 5 Air introduction part 6 Cyclone separator 7 Storage tank 8 Exhaust part 9 Feeding device (vibration feeder) 10 Waste plastic containing aluminum to be separated and aluminum 11 Suction Mouth 12 Metal pipe, separation part 13 Plastic pulverized product (separate) 14 Waste plastic collection container 15 Workpiece 16 Locus of insulating particles 17 Locus of conductive particles A Rotating drum electrode B Electrostatic electrode

Continued on the front page F term (reference) 4D053 AA03 AB01 BA01 BB01 BC01 BD04 DA10 4D054 GA01 GA04 GA09 GB10 4F301 BA02 BA03 BA07 BA10 BA15 BA17 BA19 BA21 BA29 BD05 BE31 BF08 BF32 BG02 BG21 BG32 BG44

Claims (14)

[Claims] A circulating path connecting a blower, a plastic pipe, a cyclone, and a storage tank is formed, and a crushed plastic and / or a granular material is put in the circulating path. A static electricity generator characterized by generating static electricity on the surface of plastic piping by circulating. 2. In order to remove plastic debris and / or fine particles of particulate matter generated by circulating inside the circulation path,
Arrange a cyclone separator as a cyclone,
2. The static electricity generator according to claim 1, further comprising a storage tank for storing the crushed plastic and / or granular material circulating under the cyclone separator. 3. An air inlet for cooling the circulating plastic crushed material and / or granular material between the cyclone separator and a storage tank for the plastic crushed material and / or granular material provided under the cyclone separator. Claim 2
The static electricity generator according to the item. 4. A metal pipe having an inner diameter larger than the outer diameter of the plastic pipe and shorter than the length of the plastic pipe is extrapolated outside the plastic pipe, and the metal pipe is eccentric. A high-voltage static electricity generating portion is formed by arranging at a position to be brought into contact with a plastic pipe at a tangent line and concentrating static electricity generated on the surface of the plastic pipe at the contact portion. Item 4. The static electricity generator according to any one of Items 1 to 3. 5. A metal curved or flat plate-like body covering a part or all of the outer periphery is arranged on a plastic pipe so as to be in one-tangential contact with the plastic pipe, and is generated on the surface of the plastic pipe. The static electricity generating device according to any one of claims 1 to 4, wherein a high-voltage static electricity generating portion is formed by concentrating static electricity generated on the contact portion. 6. A plurality of protrusions are provided on an outer surface of a plastic pipe, and are arranged so as to be in contact with a metal pipe or a metal curved or flat plate-like body at the top of the protrusion. Or the static electricity generator according to item 5. 7. The static electricity generator according to claim 4, wherein the plastic pipe is made of vinyl chloride resin. 8. The crushed plastic and / or granular material may be:
The static electricity generator according to any one of claims 1 to 7, wherein at least one of resins selected from polyethylene terephthalate, polyethylene, and polypropylene is used. 9. The static electricity generator according to claim 4, wherein the absolute value of the static electricity voltage is 100,000 volts or more. 10. A metal pipe which is suspended on a plastic pipe, or is installed so as to be in tangential contact with the outer surface of the plastic pipe, or the material of the metal curved or flat plate is iron. The static electricity generator according to any one of claims 4 to 9, wherein the static electricity generator is aluminum. 11. The static electricity generating device according to claim 4, wherein the high-voltage static electricity generating site is any one selected from an upper portion, a lower portion, and a side portion of the circulation path. 12. A supply device for supplying a crushed aluminum-containing waste plastic to a high-voltage static electricity generation site, an aluminum fragment recovery device for sucking and recovering an aluminum fragment flipped by electrostatic repulsion,
12. A collection container for collecting waste plastic from which aluminum has been separated and removed is provided.
Item 4. The electrostatic separation device according to any one of the above items. 13. The surface of a high-voltage static electricity generating part of the static electricity generating device according to any one of claims 4 to 12,
Recovery for dropping and supplying waste plastic containing aluminum that has been pulverized in advance, flicking off the aluminum pieces by electrostatic repulsion generated on the charged aluminum pieces, and sucking and collecting the aluminum pieces in the area where the aluminum pieces scatter An electrostatic separation method comprising providing an apparatus to separate and collect aluminum pieces, and simultaneously collecting waste plastic from which aluminum has been separated and removed into a collection container to separate waste plastic from aluminum. 14. A waste plastic containing aluminum is heated to 30 ° C. or more and 100 ° C. or less, preferably 30 ° C.
The electrostatic separation method according to claim 13, wherein after the heat treatment is performed at a temperature of 50 ° C. or less, the material is pulverized to a size of 5 mm or less.