JP2007260498A - Electrostatic separator, electrostatic separation system and electrostatic separation process for nonmagnetic metal-containing plastic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To recover pulverized plastic by efficiently separating and removing nonmagnetic metals from the pulverized matter of a nonmagnetic metal-containing plastic at a low cost. <P>SOLUTION: An electrostatic separator comprises: a static electricity generating section for generating static electricity; an electrostatic separation section 3 which is constituted of an electrically conductive connector 31 that is connected to an electric conductor of the static electricity generating section, charged bodies 35, 36 that are charged with the static electricity by being connected to the electrically conductive connector 31 and have tilting upper faces and grounded bodies 37 that are laterally provided so as to be opposite apart from an lower side of the tilting face and that are insulated from the charged bodies 35, 36 and a feed section 4 for feeding the pulverized plastic 11 containing the nonmagnetic metal to the tilting face of the charged body 35 in the electrostatic separation section 3. The nonmagnetic metals are separated by utilizing electrostatic repulsion action, from the pulverized plastic 11 containing the nonmagnetic metal falling along the tilting face. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electrostatic separation device that separates and removes the nonmagnetic metal from a pulverized plastic containing nonmagnetic metal such as aluminum or copper, collects the pulverized plastic, and recycles it as a recycled raw material. And an electrostatic separation system and an electrostatic separation method.

  Dimensional stability is maintained in automotive parts such as automotive windshield and rear glass packing and molding materials, specifically flush mount molding, opening trim, side molding and roof molding (packing for ceiling windows). Therefore, a metal made of iron wire, aluminum wire, copper wire, etc. is used. Therefore, since scrap materials such as scraps and defective products at the time of manufacturing these automotive parts contain metals such as iron, aluminum, copper, etc., when the scraps or scraps are to be crushed and reused Although iron can be magnetically selected by a magnet, it is not easy to separate nonmagnetic metals such as aluminum and copper, and they cannot be reused unless these metals are separated.

  Further, when separating the non-magnetic metal, a large-scale apparatus is required and the processing cost is high, so that it is usual that the non-magnetic metal is landfilled or incinerated. However, in the landfill process, problems such as an increase in processing cost due to a decrease in the space of the landfill processing site and an impact on the environment have arisen. In the incineration process, most of the resin components constituting the automobile parts are Because it is made of vinyl chloride resin and contains aluminum, copper, etc., it is incinerator due to generation of hydrogen chloride gas, melting adhesion of aluminum to the furnace body during combustion, and combustion temperature rise due to oxidation combustion. Problems such as troubles and environmental impacts have arisen. Therefore, landfill processing and incineration processing are also restricted.

  Here, the outline | summary of the apparatus used in order to isolate | separate and remove metals, such as aluminum and copper, from the waste plastics containing the said nonmagnetic metal conventionally is demonstrated. As such a device, an eddy current sorting device and an electrostatic separation device, which are electrical sorting devices, are known. 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 of moving a conductive object, and is a device used for sorting steel cans and aluminum cans.

  On the other hand, as the electrostatic separation device, there are a device using a drum electrostatic electrode (for example, see Patent Document 1), a device using a plate-shaped electrostatic electrode (for example, see Patent Document 2), and the like. A conceptual diagram of an apparatus using electrodes is shown in FIG. A high voltage is applied to the metal cylinder B placed in parallel to the grounded metal roll A. If the polarity of the metal cylinder B is negative, the surface of the metal roll A is positively charged. The particles 101 entering between the metal roll A and the metal cylinder B are polarized by electrostatic induction, generating a negative charge on the side close to the metal roll A and a positive charge on the opposite side. Here, if the particle 101 is a conductive particle, when it is in contact with the metal roll A, the charge is lost and the whole is positively charged and repelled by the metal roll A (see the locus 102). Further, if the particle 101 is an insulating particle, it is attracted to the metal roll A by a negative charge and loses the attraction force outside the electric field and falls (see locus 103). As a result, the conductive particles and the insulating particles are separated and collected because the drop positions are different. Further, as an electrostatic separation method, a method (Patent Document 3) in which a printed copper foil substrate or a packaging material laminate foil is electrostatically separated after being crushed, wind-screened, and finely pulverized is also known.

  However, when the waste plastic containing the non-magnetic metal is pulverized and the non-magnetic metal is selected, the separation is not sufficient, and the improvement is desired. In addition, when using an eddy current sorter, the volume of the non-magnetic metal is small and the eddy current force generated in the magnetic field is weakened. Therefore, there is a problem in that the separation efficiency is not improved. Since the apparatus which has this electrode is required, there exists a problem that cost increases. Furthermore, in the method of Patent Document 3, since it is necessary to pulverize the metal-containing plastic, there is a problem that the processing efficiency of electrostatic separation is inferior.

  Furthermore, the waste plastic containing the non-magnetic metal is subjected to a wind separation process to separate a lightweight material mixed in the waste plastic, if necessary, after pulverization, and then non-magnetic by a known non-magnetic metal separator. After separation and removal of the metal, it is melted and pelletized by an extruder and recycled and recycled. However, when the separation level is low, foreign matter such as aluminum and copper is removed because a mesh screen is installed in the extruder. However, when the amount of aluminum, copper, or the like is large, the mesh screen is clogged, the mesh screen needs to be frequently replaced, and there is a problem that steady operation of the extruder cannot be performed.

  In addition, as an electrostatic separator, a circulation path connecting a blower, a plastic pipe, a cyclone, and a storage tank is formed, and plastic crushed material or the like is placed inside the circulation path to circulate, and static electricity is formed on the surface of the plastic pipe. Static electricity generated on the surface of the plastic pipe by fitting the metal pipe to the plastic pipe, placing the metal pipe in an eccentric position and contacting the plastic pipe with a tangent line. Is also proposed to separate and remove aluminum by electrostatic repulsion after supplying waste plastic processed material containing pre-ground aluminum to the high-voltage static electricity generation site. (See Patent Document 4), and FIG. 7 shows a conceptual diagram thereof.

  The configuration of Patent Document 4 enables the electrostatic separation and removal of aluminum from waste plastics containing aluminum at a low cost by stably generating high-voltage static electricity by combining general-purpose devices. Although it has characteristics, there is room for improvement with respect to improvement of separation accuracy and the like because it may be difficult to control the directionality of the aluminum piece that is blown off by static electricity.

JP 2002-136896 A JP-A-55-102446 JP-A-10-57927 JP 2002-45728 A

  An object of the present invention is to collect plastics by separating and removing the nonmagnetic metals from the pulverized plastics at low cost and efficiently in order to effectively use plastics containing nonmagnetic metals such as aluminum and copper. And providing an electrostatic separation apparatus, electrostatic separation system and electrostatic separation method for recycling.

  In order to solve the above problems, an electrostatic separation device for a non-magnetic metal-containing plastic according to the present invention includes a static electricity generator that generates static electricity, a conductive coupler connected to a conductor of the static electricity generator, and the conductive material. A charging member connected to a conductive coupler and charged with the static electricity, the upper surface of which is an inclined surface, and spaced apart from the lower side of the inclined surface so as to face the lower side and insulated from the charged body An electrostatic separation portion made of a grounded body, and a supply portion for supplying a non-magnetic metal-containing plastic pulverized product to the inclined surface of the charged body of the electrostatic separation portion, the inclined surface being supplied to the inclined surface The non-magnetic metal is separated from the pulverized non-magnetic metal-containing plastic falling along the line by utilizing electrostatic repulsion.

  Here, the static electricity generation unit is connected to the lower side of the centrifugal dust collector, the centrifugal dust collector, a storage tank capable of storing a circulated product made of at least one of plastic crushed material and granular material, and A circulation path is formed by a blower connected to the storage tank by the first pipe and the centrifugal dust collector and the second pipe, and one of the first pipe and the second pipe is made of plastic. The other part is a conductive pipe in the middle part, and the part connected to both sides of the conductive pipe is a plastic pipe, and the circulating material circulates in the circulation path so that static electricity is applied to the conductive pipe. It is preferable that it is generated.

  Further, it is preferable that the charged body is supported by the conductive connector.

  Furthermore, it is preferable that the conductive pipe is bent so that the frictional resistance between the circulating material and the conductive pipe is increased.

  Furthermore, the charged body is a conductive plate, and a plurality of the plate members are arranged in the vertical direction so that adjacent upper and lower plate members are in a substantially U shape when viewed from the side, and directly below the lower edge of the upper plate member. In addition, the upper ends of the lower plate members are positioned apart from the lower end edges, the upper plate portions are spaced apart from the lower end edges of the upper and lower multi-stage plate members, and the grounding bodies are respectively provided so as to face the lower end edges. Therefore, it is preferable that the separation of the non-magnetic metal performed using the electrostatic repulsion action is continuously performed a plurality of times.

  In order to solve the above problems, an electrostatic separation system for non-magnetic metal-containing plastic according to the present invention includes an impact-type pulverizer for pulverizing non-magnetic metal-containing plastic, the electrostatic separation device, and the impact-type pulverizer. And a transport device that transports the pulverized pulverized product to the supply unit of the electrostatic separation device.

  In order to solve the above problems, the electrostatic separation method for a nonmagnetic metal-containing plastic according to the present invention comprises a pulverization step of pulverizing the nonmagnetic metal-containing plastic with an impact pulverizer, and a pulverized product pulverized by the pulverization step. A transporting step for transporting to the supply unit of the electrostatic separation device, and electrostatic separation for electrostatically separating the pulverized material transported in the transporting step and supplied to the supply unit by the electrostatic separation unit of the electrostatic separation device It consists of a process.

  Here, the impact type pulverizer used in the pulverization step is preferably a swing hammer crusher provided with a punching metal for regulating the size of the pulverized product or a screen having a mesh opening of 2 mm or more and 20 mm or less.

  Moreover, it is preferable to provide the sieve selection process which removes a fine powder with a sieve after the said grinding | pulverization process.

  Furthermore, it is preferable to separate the magnetic metal by magnetic separation in at least one of the pulverizing step and the conveying step.

  According to the non-magnetic metal-containing plastic electrostatic separation device according to the present invention, a static electricity generating unit that generates static electricity, a conductive connector connected to a conductor of the static electricity generating unit, and a connection to the conductive connector From a charged body having an electrostatic charge and an upper surface having an inclined surface, and a ground body that is spaced apart from the lower side of the inclined surface and is opposed to the lower side and is insulated from the charged body. And a supply unit for supplying the non-magnetic metal-containing plastic pulverized material to the inclined surface of the charged body of the electrostatic separation unit, and is supplied to the inclined surface and descends along the inclined surface. Since non-magnetic metals are separated from non-magnetic metal-containing plastic pulverized products using electrostatic repulsion, special drum electrodes and electrical devices are required for the plastic reclaimers by combining extremely versatile equipment. do not do The valence and compact configuration, the non-magnetic metal from the pulverized plastic containing non-magnetic metal formed of aluminum, copper, or the like with a low cost and efficiently separated and removed to recover the plastic pulverized product can be recycled. In addition, since the static electricity generation unit and the electrostatic separation unit are connected by the conductive connector, and the static electricity generation unit and the electrostatic separation unit are separated, the static electricity generation unit in the electrostatic separation unit Electrostatic separation can be efficiently performed using static electricity generated in In addition, since electrostatic separation is performed using the charged body and the ground body, it is easy to control the directionality of the nonmagnetic material that is blown off by static electricity, and the separation accuracy of the nonmagnetic material can be improved.

  The static electricity generation unit is connected to a centrifugal dust collector, a lower side of the centrifugal dust collector, a storage tank capable of storing a circulated product made of at least one of a plastic crushed material and a granular material, and the A circulation path is formed by a blower connected by a storage tank and a first pipe and by the centrifugal dust collector and a second pipe, and one of the first pipe and the second pipe is made of plastic. The other part is a conductive pipe in the middle and the part connected to both sides of the conductive pipe is a plastic pipe, and the circulating material circulates in the circulation path to generate static electricity in the conductive pipe. To generate static electricity stably with an inexpensive and compact configuration consisting of a combination of general-purpose equipment for plastic recycling companies. It can be.

  Further, when the charged body is supported by the conductive connector, the structure can be simplified and the cost can be reduced, and vibration of the static electricity generating part can be transmitted through the conductive connector. Therefore, the charged body vibrates, so that the lowering of the crushed plastic material along the inclined surface of the upper surface of the charged body can be ensured and uniformized.

  Furthermore, when the conductive pipe is bent so that the frictional resistance between the circulating material and the conductive pipe is increased, the static electricity generating section can generate higher voltage static electricity by a simple and compact configuration. It can be generated efficiently.

  In addition, the charged body is a conductive plate material, and a plurality of the plate materials are arranged in the vertical direction so that adjacent upper and lower plate materials are in a substantially U shape when viewed from the side, and immediately below the lower edge of the upper plate material. The upper ends of the lower plate members are positioned apart from the lower edge, and are separated from the lower edges of the upper and lower multi-stage plate members, respectively, and the grounding bodies are horizontally provided so as to face the lower edge. When the separation of the nonmagnetic metal performed using the electrostatic repulsion action is continuously performed a plurality of times, the electrostatic separation can be efficiently performed with a simple and compact configuration, and the recovered resin pulverized product The separation accuracy of the nonmagnetic metal can be improved.

  According to the electrostatic separation system for non-magnetic metal-containing plastic according to the present invention, the impact-type pulverizer for pulverizing the non-magnetic metal-containing plastic, the electrostatic separation device, and the pulverized material pulverized by the impact-type pulverizer Is transported to the supply unit of the electrostatic separation device, so that the nonmagnetic metal can be efficiently and accurately separated from the composite waste plastic containing the nonmagnetic metal made of aluminum or copper. Therefore, the plastic from which these metals have been separated and removed can be easily pelletized by an extrusion melting apparatus, and the waste plastic that has been difficult to reuse can be recycled.

  According to the method for electrostatic separation of non-magnetic metal-containing plastic according to the present invention, a pulverization step of pulverizing the non-magnetic metal-containing plastic with an impact pulverizer, and the pulverized product pulverized in the pulverization step with the electrostatic separation device A transport process for transporting to the supply section, and an electrostatic separation process for electrostatically separating the pulverized material transported by the transport process and supplied to the supply section by an electrostatic separation section of the electrostatic separation device. Since the non-magnetic metal can be separated efficiently and accurately from composite waste plastic containing non-magnetic metal such as aluminum and copper, the plastic from which these metals have been separated and removed can be easily pelletized with an extrusion melting device. This makes it possible to recycle waste plastics that have been difficult to reuse.

  In addition, when the impact pulverizer used in the pulverization step is a punching metal that regulates the size of the pulverized product or a swing hammer crusher provided with a screen having a mesh opening of 2 mm or more and 20 mm or less, a nonmagnetic metal In addition to applying an appropriate impact force to plastics containing pulverized metal components and pulverizing the metal components from the resin coating layer, the nonmagnetic metal is removed from the pulverized nonmagnetic metal-containing plastic in the electrostatic separation process. It can be separated with high accuracy.

  Furthermore, if a sieving selection step is provided after the pulverization step to remove the fine powder with a sieve, the electrostatic separation performance is reduced due to the fine powder gathering on the grounding body of the electrostatic separation portion in the electrostatic separation step. Since it can prevent, the isolation | separation precision of the nonmagnetic metal in an electrostatic isolation | separation process can be improved.

  Furthermore, when magnetic metal is separated by magnetic separation in at least one of the pulverization step and the conveyance step, magnetic metal such as iron is adsorbed to the magnet from the pulverized non-magnetic metal-containing plastic pulverized by the pulverization step. And can be efficiently removed.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments shown in the accompanying drawings, and includes all the embodiments that satisfy the requirements described in the claims. It is a waste. Further, as will be described in detail below, the non-magnetic metal-containing plastic electrostatic separation device 1 according to the present invention has a circulating material 29 made of, for example, at least one of plastic crushed material and granular material circulated in a circulation path C. The static electricity generating part 2 that generates static electricity by the process, and the plastic pulverized material 11 containing a nonmagnetic metal such as aluminum or copper by an electrostatic repulsion effect using the static electricity generated by the static electricity generating part 2 An electrostatic separation unit 3 for separating a nonmagnetic metal and a supply unit 4 for supplying the nonmagnetic metal-containing plastic pulverized material 11 to the electrostatic separation unit 3 are provided.

  1 and 2 are schematic views showing the configuration of a non-magnetic metal-containing plastic electrostatic separation device 1 according to an embodiment of the present invention. FIG. 1 mainly shows the configuration of the static electricity generating unit 2. Reference numeral 2 denotes the configuration of the electrostatic separation unit 3 and the supply unit 4. In FIG. 1, the static electricity generator 2 is connected to the lower side of a centrifugal dust collector 21 and a centrifugal dust collector 21, for example, a cyclone separator, and can store the circulating material 29, for example, made of hard polyvinyl chloride resin. And a blower 23 that is, for example, a fan that is connected to the storage tank 22 by a first pipe 24 and connected to the centrifugal dust collector 21 by a second pipe 25. The centrifugal dust collector 21, the storage tank 22, the first pipe 24, the blower 23, and the second pipe 25 form a circulation path C in these devices and pipes. By inserting and circulating 29, static electricity is generated as described above. In addition, what is necessary is just to make the circulation speed of the circulating material 29 into the speed of 20 m / s or more and about 50 m / s or less normally used for the transfer of a plastic ground material.

  Here, the first pipe 24 is a plastic pipe 26, and the second pipe 25 is a conductive pipe 28 at an intermediate portion thereof, and portions connected to both sides of the conductive pipe 28 are plastic pipes. 27a and 27b. Note that the second pipe 25 may be a plastic pipe, and an intermediate portion of the first pipe 24 may be a conductive pipe. When a different material or the same kind of circulating material 29 circulates in the plastic pipes 26, 27 a, 27 b, the plastic pipes 26, 27 a are caused by friction between the plastic pipes 26, 27 a, 27 b and the circulating material 29. , 27b, high voltage static electricity is generated. The combination of the plastic pipes 26, 27a, 27b and the material of the circulating material 29 increases the dielectric constant of the material and the greater the difference in the frictional charge train, the higher the electrostatic voltage generated. The polarity (positive or negative) of the generated electrostatic voltage can be selected.

  The plastic pipes 26, 27a, 27b are made of vinyl chloride resin such as vinyl chloride resin, FRP (fiber reinforcement plastic), polypropylene resin, polyolefin resin such as polyethylene resin, or polyphenylene ether resin. 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. The conductive pipe 28 may be a metal pipe such as iron, stainless steel, or aluminum pipe made of a highly conductive material, or a lining pipe in which a plastic pipe is inserted into a metal pipe. In consideration of piping wear due to collision and friction of the circulating material 29, the conductive piping 28 is preferably an iron piping or a stainless steel piping.

  The plastic pipes 27a and 27b are inserted into the conductive pipe 28, and the high voltage static electricity charged in the plastic pipes 27a and 27b moves to the conductive pipe 28. Voltage static electricity is generated stably. With such a configuration, the electrostatic voltage in the electrostatic separation unit 3 to be described later can be stably set to a high voltage having an absolute value of 10 kV or more.

  Further, if the conductive pipe 28 is bent so that the frictional resistance with the circulating material 29 is increased, higher voltage static electricity can be generated by increasing the frictional resistance with the circulating material 29. As for the bent shape of the conductive pipe 28, various shapes such as a zigzag shape are conceivable. As shown in FIG. 1, the flow direction is bent three times by 90 ° with respect to the discharge direction of the blower 23. A substantially U-shaped pipe is preferable because high-voltage static electricity can be generated without impairing the circulation of the circulating material 29. It should be noted that the position where high-voltage static electricity is generated in this way can be set to an appropriate position in the circulation path C of the static electricity generating unit 2 if insulation measures are taken so that the generated static electricity is not grounded.

  Fine powder finely pulverized to several hundreds μm or less due to collision and friction of the circulating material 29 with the pipe inner surface and the inner surface of the equipment is separated by the centrifugal dust collector 21 and removed from the circulation path C. Preferably, the circulating material 29 containing fine powder flows into the cylindrical cylinder of the centrifugal dust collecting device 21 from the tangential direction and swirls in the tower, and the fine powder rises on the rising air current, It is discharged from the wind exhaust portion 21a. On the other hand, the circulated product from which the fine powder has been separated collides with the tower wall by centrifugal force and falls to the storage tank 22 to be used for the next continuous circulation. The circulating material 29 may be separated and removed by sieving fine powder after circulation for a certain period of time. In addition, since the circulating material 29 is reduced by removing fine powder, it is preferable to replenish the circulating material 29 every predetermined time to make the circulating amount constant.

  With the configuration in which the centrifugal dust collecting device 21 and the storage tank 22 are provided, blockage of the circulation path C due to fine powder generated by the collision and friction of the circulating material 29 is suppressed. As a result, the circulation of the circulating material 29 is improved, and high-voltage static electricity can be stably generated over a long period of time on the plastic pipe. Furthermore, since the circulating material 29 is cooled by providing the storage tank 22 with the air introduction part 22a that introduces cooling air into the circulation pipe C from the lower side of the centrifugal dust collector 21, the circulating material 29 is heated. Blockage in the piping path C due to melting, adhesion to the blower 23, or the like can be prevented.

  As the circulatory material 29 circulated in the circulation path C, one or more kinds of resins composed of polyester resins such as polyethylene terephthalate, polyolefin resins such as polyethylene and polypropylene, hard vinyl chloride resins, soft vinyl chloride resins and the like are used. It is most preferable to use, and high 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 usual level, for example, 30 m / s or more and 50 m / s or less.

  It is preferable to use a product obtained by crushing or crushing the circulating material 29 to have 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. A hard resin can be used for the circulating material 29, but it is preferable to use a soft resin because it is easily crushed upon impact during circulation. In addition, it is possible to use a resin that does not contain inorganic fillers such as calcium carbonate, calcium oxide, barium carbonate, barium sulfate, magnesium hydroxide, aluminum hydroxide, clay, and talc. Since generation | occurrence | production of can be reduced, it is preferable. Further, as the circulated product 29, waste can be used after being pulverized or crushed, which is preferable because it is inexpensive.

  Note that the configuration of the static electricity generation unit 2 is not limited to the configuration shown in FIG. 1, and may be any configuration that can generate static electricity. However, the configuration as shown in FIG. 1 is more preferable because it can stably generate static electricity by an inexpensive and compact configuration composed of a combination of extremely general-purpose devices for plastic recycling companies. It is.

  In FIG. 2, the electrostatic separator 3 is generated by the static electricity generator 2 supported by the conductive coupler 31 connected to the conductive pipe 28, which is a conductor of the static electricity generator 2, and the conductive coupler 31. Static electricity is charged, and charging bodies 35 and 36 whose upper surfaces are inclined surfaces are spaced apart from the lower sides (lower end edges 35a and 36a) of the inclined surfaces, and are arranged horizontally so as to face the lower sides (lower end edges 35a and 36a). And grounding bodies 37, 37, etc., which are conductors that are insulated from the charging bodies 35, 36 and are grounded. The supply unit 4 supplies non-magnetic metal-containing plastic pulverized material from, for example, the upper part 35c of the upper inclined surface of the charging body 35 of the electrostatic separation unit 3, and includes a supply hopper 41, a screw conveyor 42, and the like. The

  As described above, the static electricity generated by the static electricity generator 2 charges the charging members 35 and 36 via the conductive connector 31. That is, as shown in FIG. 1, the conductive band 32a,..., And the conductive plate 32b, which are connecting members 32, are connected to the conductive pipe 28 of the static electricity generating unit 2, and the conductive band 32a,. And is attached by connecting and fixing a conductive plate 32b to the conductive bands 32a. As shown in FIGS. 1 and 2, the conductive charging bodies 35 and 36 are supported by the conductive support member 33, for example, a rod-shaped conductive support member 33 whose upper end is fixed to the conductive plate 32 b by a bolt or the like. Since the fixing members 34 and 34 are fixed, the static electricity is charged to the charging bodies 35 and 36. As described above, the static electricity charged to the charging members 35 and 36 is preferably a high voltage with an absolute value of the electrostatic voltage of 10 kV or more, and preferably 30 kV or less from the viewpoint of safety. Thus, the workability is further improved by connecting the static electricity generating part 2 and the electrostatic separating part 3 by the conductive coupler 31 and separating the positions of the static electricity generating part 2 and the electrostatic separating part 3. be able to.

  The conductive connector 31 is not limited to the configuration that supports the charging members 35 and 36 as shown in FIG. 2, but the conductive connecting member is a conductive wire, and the charged members 35 and 36 are formed by the conductive wire. May be configured to be charged. Specifically, the electrostatic separation unit 3 is insulated by providing a support member for the charging members 35 and 36 separately on a wood or paper material, and the conductive pipe 28 and the charging member which are the conductors of the static electricity generation unit 2. It is also possible to charge 35 and 36 by connecting them with conductive wires. That is, a support member for the charging members 35 and 36 can be separately provided to insulate the support member from the housing or the like. However, as shown in FIG. 2, for example, a conductive member having a rod-like conductive support member 33 is provided. The configuration in which the charging members 35 and 36 are supported by the connector 31 is a more preferable configuration from the viewpoint of simplification of the configuration and cost reduction.

  As shown in FIG. 2, the charged bodies 35 and 36 are conductive plate materials such as stainless steel, aluminum, and iron plate, and the ground bodies 37 and 37 are conductors made of metal wires or metal plates, for example. The charging members 35 and 36, which are the plate members, are arranged side by side in the vertical direction by alternately changing the inclination directions around the horizontal axis, and the upper and lower plate members are arranged in a substantially U shape when viewed from the side. Is done. Further, the upper end portion 36c of the lower charging body 36 is positioned just below the lower end edge 35a of the upper charging body 35 and spaced from the lower end edge 35a, and is separated from the lower end edge 35a of the upper charging body 35. A grounding body 37 is provided horizontally so as to face the lower end edge 35a. Further, a grounding body 37 is provided horizontally so as to be separated from the lower end edge 36a of the lower charging plate 36 and to face the lower end edge 36a.

  With the configuration as described above, the charged bodies 35 and 36 are charged with static electricity, and the upper surface thereof is inclined. In addition, when the charging members 35 and 36 are plate materials, the inclination angle of the plate members is substantially uniform when the plastic pulverized material is substantially uniform along the upper surfaces of the charging members 35 and 36. It can be installed at an angle that descends. For example, the angle is preferably about 20 ° to 40 ° with respect to the horizontal.

  A screw conveyor that can change the supply speed by controlling the rotational speed with an inverter or the like after the plastic pulverized material 11 containing a nonmagnetic metal made of aluminum or copper previously pulverized is put into the supply hopper 41 of the supply unit 4. 42, the nonmagnetic metal piece made of aluminum or copper is brought into contact with the charged body 35 charged with static electricity on the inclined surface. Descent along. As shown in FIGS. 1 and 2, the charging members 35 and 36 are supported by a conductive connector 31, and vibrations of the centrifugal dust collector 21 and the blower 23 in the static electricity generator 2 of FIG. 2 is transmitted to the charging bodies 35 and 36 in FIG. 2 via the pipe 25 and the conductive connector 31, the charging bodies 35 and 36 vibrate slightly. Therefore, the vibration of the charging members 35 and 36 can ensure and make uniform the lowering of the crushed plastic material 11 along the inclined upper surface of the charging members 35 and 36. In this way, the non-magnetic metal 12 contained in the pulverized material 11 is charged with static electricity in the process in which the pulverized plastic material 11 descends along the upper surface inclined surfaces of the charged bodies 35 and 36, and the lower side of the upper surface of the charged body 35 In the vicinity (in the vicinity of the lower end edge 35a), it is flipped off by the electrostatic repulsion action toward the grounding body 37 and recovered in the recovery container 38.

  On the other hand, the remaining plastic pulverized product 13 from which most of the nonmagnetic metal is separated and dropped falls from the lower end edge 35 a of the charged body 35 to the upper end portion 36 c of the charged body 36 by gravity, and is contained in the remaining plastic pulverized product 13. The magnetic metal 14 is charged while moving along the inclination of the charging body 36, and is recovered by being repelled by the electrostatic repulsion action toward the ground body 37 at a position near the lower side of the upper surface of the charging body 36 (near the lower end edge 36a). It is collected in the container 39. The residual plastic pulverized material 15 from which the nonmagnetic metal has been separated and removed in this way falls from the lower end edge 36 a of the charged body 36 by gravity and is collected in the collection container 40. The residual plastic pulverized material 15 that is efficiently electrostatically separated by the simple and compact configuration as described above and recovered in the recovery container 40 is stored in a storage tank or flexible container bag using a transport device such as a screw feeder or a transport blower. Collected.

  The charging body in the electrostatic separation unit 3 having the above-described configuration is not limited to the configuration using the upper and lower charging bodies 35 and 36 whose upper surfaces are inclined as shown in FIG. As shown in FIG. 3, it may be configured to have only one stage of the charging body 35 whose upper surface is inclined, or three or more stages of charging bodies whose upper surface is inclined is arranged in parallel in the vertical direction. You may make it perform the electrostatic separation of a magnetic metal 3 times or more continuously. Thus, if it is set as the structure which performs electrostatic separation of a nonmagnetic metal continuously several times, the isolation | separation precision of the nonmagnetic metal in the resin ground material collect | recovered can be improved. Furthermore, the residual plastic pulverized material 15 collected in the collection container 40 may be electrostatically separated again by the electrostatic separation unit 3, or after the residual plastic pulverized material 15 is finely pulverized, the electrostatic separation unit 3 again. Electrostatic separation may be performed, and separation accuracy of the nonmagnetic metal in the pulverized resin recovered by such an electrostatic separation method can be improved.

  In a plastic containing a nonmagnetic metal made of aluminum or copper, since these metals are inserted and bonded in a base resin and are very difficult to separate, the electrostatic separation device 1 makes the nonmagnetic metal In order to accurately separate the nonmagnetic metal from the crushed plastic material 11, it is necessary to separate the metal inserted into the resin by separating it from the resin coating layer by applying an appropriate impact force during pulverization. Therefore, it is preferable to use an impact type pulverizer suitable for pulverizing with appropriate impact force and shearing force. In addition, when plastics containing nonmagnetic metals such as aluminum and copper are pulverized, the metal components are pulverized by applying an appropriate impact force to the plastics containing these nonmagnetic metals, and the metal components are removed from the resin coating layer. It is preferable to use a swing hammer crusher as the impact type pulverizer because it has an action of peeling.

  FIG. 4 is a schematic diagram showing the configuration of the crushing step in the method for electrostatic separation of a non-magnetic metal-containing plastic according to an embodiment of the present invention, and shows a configuration example using a swing hammer crusher 5 as an impact crusher. ing. In the figure, a suction air duct is provided at the lower portion on the discharge side of the swing hammer crusher 5 to connect a blower 6, and the blower 6 and a centrifugal dust collecting device 7 that is, for example, a cyclone separator are connected by a pipe 10 to be centrifuged. A collection container 9 in which a magnet for magnetism separation 8 is installed is installed below the force dust collector 7. When a plastic containing a non-magnetic metal such as aluminum or copper is introduced into the inlet 51 of the swing hammer crusher 5, it is pulverized at a high speed by a rotary blade 52 made of a rotary hammer until it becomes smaller than the opening diameter of the screen 53. The pulverized product is collected in the pulverized product receiving tank 54, and the pulverized product is sucked by the blower 6 and sent to the centrifugal dust collecting device 7, and the plastic pulverized product 11 containing the nonmagnetic metal is recovered in the recovery container 9. .

  The swing hammer crusher 5 is characterized in that the impact frequency applied to the workpiece is high, and when the rotational speed is 1000 rpm or more and 1800 rpm or less, the grinding efficiency is high, which is a desirable mode. Further, when a plastic containing a nonmagnetic metal such as aluminum or copper is pulverized to obtain a pulverized material 11, the swing hammer 11 has a particle diameter of 2 mm to 20 mm, preferably 3 mm to 15 mm. It is preferable to grind with a crusher 5. The size of the pulverized product 11 is achieved by installing a punching metal or a screen 53 having a grid opening for regulating the size of the pulverized product 11 on the swing hammer crusher 5 and pulverizing. When the screen 53 having an opening in this range is used, it can be efficiently pulverized, and the nonmagnetic metal made of aluminum or copper is well separated in the subsequent electrostatic separation step. Therefore, the plastic from which the nonmagnetic metal is separated This is because the pulverized material (for example, the remaining plastic pulverized material 15 in FIG. 2) can be recovered and recycled.

  Moreover, it is preferable to select the particle size of the pulverized material 11 to be 20 mm or less, since the peelability between the base resin and the metal is not impaired, and the decrease in separation accuracy between the resin component and the metal component is suppressed. Furthermore, when the particle size of the pulverized material 11 is selected to be 3 mm or more and 15 mm or less, a plastic containing a nonmagnetic metal such as aluminum or copper can be efficiently pulverized, and the metal component is sufficiently separated from the resin component. More preferred. When punching metal is used as the screen 53, the shape of each opening is most commonly circular, but is not particularly limited, and may be oval, rectangular, or any other shape.

  FIG. 5 is a flowchart showing a method for electrostatic separation of a non-magnetic metal-containing plastic according to an embodiment of the present invention. A pulverizing process mainly for pulverizing a plastic containing a nonmagnetic metal such as aluminum or copper with a swing hammer crusher 5 to form the pulverized material 11, and conveying the pulverized material 11 to the supply unit 4 of the electrostatic separation apparatus 1 The process includes an electrostatic separation process in which electrostatic separation is performed by the electrostatic separation apparatus 1. By these processes, the resin pulverized product from which the nonmagnetic metal has been efficiently removed can be recovered.

  Further, after the plastic containing non-magnetic metal is pulverized by the swing hammer crusher 5 to obtain a pulverized product 11, the powder is screened with a sieve to remove the fine powder under the screen and screened. In the separation step, it is possible to prevent the fine powder from being collected on the grounding body 37 of the electrostatic separation unit 3 in the electrostatic separation device 1 and to prevent the electrostatic separation performance from being deteriorated. Accuracy can be improved. The sieve mesh used for screening is preferably smaller than the opening diameter of the screen 53 installed in the swing hammer crusher 5 and 0.1 mm or more. As shown in FIG. 5, it is preferable to provide the sieve selection step after the pulverization step.

  Moreover, the conveyance process which grind | pulverizes the plastic containing the nonmagnetic metal which consists of aluminum and copper, and conveys it to the supply part 4 in the electrostatic separation apparatus 1 is the transport apparatus by a belt conveyor, or an air blower and a centrifugal dust collector. It is possible to adopt a method of pneumatically transporting with a transport device that combines the above, but it is preferable to separate magnetic metals such as iron by performing magnetic separation using a magnet before supplying to the supply unit 4. At this time, if a strong magnetic separation magnet 8 is installed at the lower part of the belt conveyor, the blower outlet, or the centrifugal dust collector 7 shown in FIG. 4, the magnetic metal such as iron is attracted to the magnet 8 and removed. can do.

  Further, a plastic containing a non-magnetic metal made of aluminum or copper is pulverized after being heat-treated at 30 ° C. or higher and 100 ° C. or lower, preferably 30 ° C. or higher and 50 ° C. or lower. Then, it is preferable because the separation efficiency of a nonmagnetic metal such as aluminum or copper can be improved. Here, as the heating method, when the belt conveyor is used in the heating and conveying process with hot air, the pulverized material 11 on the belt conveyor is irradiated with a lamp and dried, and the electrostatic separation in the electrostatic separating process Examples include a method of drying the water adhering to the plastic pulverized material 11 containing the nonmagnetic metal by a method of irradiating the pulverized material 11 on the charged body 35 of the unit 3 with a lamp and drying. On the other hand, if a method of pneumatic transportation is selected by a transportation device combining a blower and a centrifugal dust collector, the pulverized plastic 11 containing a nonmagnetic metal made of aluminum or copper is exposed to the blown air of the blower. Since the adhering moisture can be reduced, it is possible to prevent troubles due to adhering moisture in the electrostatic separation step and a decrease in separation accuracy.

  Even when the electrostatic separation apparatus 1 of FIG. 2 in the electrostatic separation process is operated in an open building in the rain, the electrostatic voltage of the charging bodies 35 and 36 in the electrostatic separation unit 3 is, for example, stable. It was -10 kV or less, and aluminum and copper were successfully separated from resin waste containing a nonmagnetic metal made of aluminum or copper.

  In addition, as a result of pelletizing the resin pulverized material recovered by the electrostatic separation method of the nonmagnetic metal-containing plastic according to the present invention with an extrusion melting apparatus, the operation can be performed when the nonmagnetic metal composed of aluminum or copper is not electrostatically separated. Those that did not exist can be pelletized at a level that allows steady operation that does not require replacement of the 100 mesh screen in the extrusion melter for more than 2 hours, and it is possible to recycle and recycle waste plastics that were previously difficult to reuse. It became.

  As plastic pipes 26, 27a, and 27b constituting the static electricity generating section 2 in FIG. 1, pipes made of vinyl chloride resin (external diameter 114 mm, thickness 6.6 mm, length 1 m to 1.5 m Mitsubishi resin diamond pipe VP100 1), and a metal pipe 28 bent as shown in FIG. 1 having an inner diameter larger than the outer diameter of the plastic pipes 27a and 27b is connected to the plastic pipes 27a and 27b to circulate the circulation path C. The frictional resistance between the object 29 and the pipe was increased. In the circulation path C of the static electricity generating part 2, 5 mm pulverized product of soft vinyl chloride resin not containing a filler such as calcium carbonate, about 5 kg is circulated at a wind speed of 30 m / s, and the static electricity shown in FIG. Static electricity of −10 kV to −16 kV is stably generated on the charged bodies (conductive plate materials) 35 and 36 of the separation unit 3, and a vinyl chloride resin automobile molding material is crushed in advance as an object to be processed ( The metal contained in the pulverized material was subjected to electrostatic separation using aluminum 1 wt% and copper 0.1 wt%.

  Further, the inclination angle of the upper and lower two-stage charged bodies (conductive plate materials) 35 and 36 in FIG. 2 was 30 degrees with respect to the horizontal, and a stainless steel plate having a length of 350 mm and a width of 500 mm was used. The grounding bodies 37, 37 are separated from the lower end edges 35a, 36a of the charging bodies (conductive plates) 35, 36 by approximately 4 cm in a substantially horizontal direction, and iron wires are horizontally provided so as to face the lower end edges 35a, 36a, respectively. We wound a copper wire and grounded it. The electrostatic voltage was measured using a digital electrostatic potential measuring device KSD-0102 or KSD-0103 (manufactured by Kasuga Denki Co., Ltd.) at a distance of 10 cm with respect to the inclined plate 14 of the electrostatic separation unit. The contents of aluminum and copper wire were calculated by taking out 300 g of the recovered pulverized material 15, manually sorting it, and measuring the weight.

Example 1
The swing hammer crusher 5 shown in FIG. 4 is equipped with a screen 53 made of punching metal having an opening of 6 mm (WALD-15 type crusher manufactured by Onoe Machinery; motor output 11 kW), and is made of a vinyl chloride resin automobile molding material. Was pulverized and magnetically separated by a magnet 8 installed under the lower outlet of a centrifugal dust collector (cyclonic separator) 7 to remove iron, and the pulverized material was recovered. This pulverized product is charged into the supply hopper 41 of the supply unit 4 shown in FIG. 2, and is charged onto the charging body 35 of the electrostatic separation unit 3 at a speed of 60 kg / h by the screw conveyor 42 to perform electrostatic separation. The remaining plastic pulverized material 15 was recovered. The contents of aluminum and copper wire in the recovered pulverized product 15 were 0.045 wt% (removal rate: 95.5%) and 0.0081 wt% (removal rate: 91.9%), respectively. The voltages of the charged bodies 35 and 36 when electrostatically separated were in the range of −13 kV to −11 kV.

(Example 2)
The swing hammer crusher 5 shown in FIG. 4 is equipped with a screen 53 made of punching metal having an opening of 4 mm (Wald-15 crusher manufactured by Onoe Machinery; motor output 11 kW), and is made of a vinyl chloride resin automobile molding material. Was pulverized and magnetically separated by a magnet 8 installed under the lower outlet of a centrifugal dust collector (cyclonic separator) 7 to remove iron, and the pulverized material was recovered. This pulverized product is sieved with a 2 mm sieve and the components on the sieve are collected, and then charged into the supply hopper 41 of the supply unit 4 in FIG. On top, electrostatic separation was performed by feeding at a rate of 60 kg / h, and the remaining plastic pulverized material 15 was collected. The pulverized material 15 was further charged into the supply hopper 41 and repeatedly electrostatically separated. The contents of aluminum and copper wire in the recovered pulverized product were 0.011 wt% (removal rate: 98.9%) and 0.0019 wt% (removal rate: 98.1%), respectively. The voltages of the charged bodies 35 and 36 when electrostatically separated were in the range of −15 kV to −11 kV.

(Example 3)
The swing hammer crusher 5 shown in FIG. 4 is equipped with a screen 53 made of punching metal having an opening of 6 mm (WALD-15 type crusher manufactured by Onoe Machinery; motor output 11 kW), and is made of a vinyl chloride resin automobile molding material. Was pulverized and magnetically separated by a magnet 8 installed under the lower outlet of a centrifugal dust collector (cyclonic separator) 7 to remove iron, and the pulverized material was recovered. After this pulverized product is screened with a sieve having a mesh opening of 2 mm and the components on the sieve are collected, the crushed material is put into the supply hopper 41 of the supply unit 4 in FIG. The mixture was charged at a rate of 30 kg / h for electrostatic separation, and the remaining plastic pulverized material 15 was recovered. The contents of aluminum and copper wire in the collected pulverized product were 0.03 wt% (removal rate: 97%) and 0.0065 wt% (removal rate: 93.5%), respectively. The voltage of the inclined plate when electrostatically separated was in the range of −15 kV to −13 kV.

(Comparative Example 1)
In the electrostatic separation device 55 shown in FIG. 7, as the plastic pipes 27a and 27b, vinyl chloride resin pipes (outer diameter: 114 mm, thickness: 6.6 mm, length: 130 cm, Mitsubishi resin Ryo pipe VP100) are used. A conductive pipe (metal pipe) 28 that is not bent as shown in FIG. 1 and has an inner diameter larger than the outer diameter of the plastic pipes 27a and 27b is connected to the plastic pipes 27a and 27b, and the circulating material 29 is In addition to forming a circulation path C to be circulated, the plastic pipe 27a has an inner diameter larger than the outer diameter of the pipe 27a and has a shorter length than the pipe 27a (an outer diameter of 139.8 mm, a thickness). (4.5mm length, 100cm length, 125A piping) and place the steel pipe 56 in a position eccentric to the plastic pipe 27a. It was suspended so as to be in contact in the manufacturing pipe 27a and the tangent line. Further, while the suction of the non-magnetic metal-containing plastic pulverized material 11 is eliminated by the vibration of the wooden diaphragm inclined vertically upward of the iron pipe 56, the supply device (vibration feeder) 57 made of the diaphragm generates static electricity. The pulverized material 11 is dropped into an iron pipe 56 having a slag and electrostatically separated. The nonmagnetic metal in the pulverized material 11 dropped from the supply device 57 is blown away above the iron pipe 56 due to electrostatic repulsion caused by static electricity generated on the iron pipe 56 after contacting the iron pipe 56. The residual plastic pulverized material 15 that has been sucked and collected from the suction port 58 and separated from the non-magnetic metal is dropped along the iron pipe 56 by gravity and collected in the collection container 59.

  The same non-magnetic metal-containing plastic pulverized material 11 as in the example was used, and in the same manner as in Example 2, the swing hammer lasher 5 of FIG. 4 was equipped with a screen 53 made of punching metal having an opening of 4 mm. A magnet installed under the lower outlet of the centrifugal dust collector (cyclone separator) 7 by crushing the vinyl chloride resin automobile molding material using a WALD-15 crusher manufactured by Onoe Kikai (motor output 11 kW). 8 was magnetically separated to remove iron, and the pulverized material was recovered. After this pulverized product is screened with a 2 mm sieve and the components on the screen are collected, it is put into the supply device 57 of the electrostatic separation device 55 shown in FIG. I put it in. As a result of electrostatic separation by supplying from the supply device 57 to the iron pipe 56 which is an electrostatic separation unit at a rate of 8 kg / h, the contents of aluminum and copper wire in the recovered pulverized product are each 0.32 wt. % (Removal rate: 68.0%) and 0.088 wt% (removal rate: 12.0%).

(Comparative Example 2)
In place of the swing hammer crusher 5 of FIG. 4, a shear type pulverizer (FS-1 manufactured by Sanroku Seisakusho; motor output 5.5 kW) equipped with a screen made of punching metal having a mesh opening of 3 mm was used, and vinyl chloride resin was used. The automobile molding material was pulverized, magnetically separated by a magnet 8 installed under the lower discharge port of a centrifugal dust collector (cyclonic separator) 7 to remove iron, and the pulverized material was recovered. This pulverized product was screened with a sieve having an opening of 3 mm to collect the pulverized product on and under the sieve. These pulverized products obtained by sieving each contained a resin and a non-magnetic metal made of aluminum or copper, and separation of the resin from aluminum or copper was not successful.

It is the schematic which shows the structure of the static electricity generation part in the electrostatic separation apparatus of the nonmagnetic metal containing plastic which concerns on embodiment of this invention. It is the schematic which similarly shows the structure of an electrostatic separation part and a supply part. It is the schematic which shows another structural example of an electrostatic separation part. It is the schematic which shows the structure of the grinding | pulverization process in the electrostatic separation method of the nonmagnetic metal containing plastic which concerns on embodiment of this invention. It is a flowchart which shows the electrostatic separation method of the nonmagnetic metal containing plastic which concerns on embodiment of this invention. It is a conceptual diagram of the conventional drum type electrostatic separation apparatus. It is a conceptual diagram of the conventional electrostatic separation apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrostatic separator 2 Static electricity generation part 3 Electrostatic separation part 4 Supply part 5 Swing hammer crusher (impact type crusher)
6 Blower 7 Centrifugal Dust Collector 8 Magnet for Magnetic Separation 9 Collection Container 10 Piping 11 Non-magnetic Metal-Containing Plastic Ground 12 Non-magnetic Metal-Containing Plastic Ground 13 Residual Plastic Ground 14 Non-electrostatic-isolated Non Magnetic metal-containing plastic pulverized product 15 Residual plastic pulverized product 21 Centrifugal dust collector 21a Air exhausting unit 22 Storage tank 22a Air introduction unit 23 Blower 24 First piping 25 Second piping 26, 27a, 27b Plastic piping 28 Conductivity Piping (conductor)
29 Circulating material 31 Conductive connector 32 Connection member 32a Conductive band 32b Conductive plate 33 Support member 34 Fixing member 35, 36 Charged body 35a, 36a Lower end edge 35b, 36b Upper end edge 35c, 36c Upper end part 37 Grounding body 38, 39, 40 Recovery container 41 Supply hopper 42 Screw conveyor 51 Input port 52 Rotary blade 53 Screen 54 Ground product receiving tank 55 Electrostatic separation device 56 Iron piping 57 Supply device 58 Suction port 59 Recovery container A Metal roll B Metal cylinder C Circulation path 101 Particle 102 Trajectory of conductive particle 103 Trajectory of insulating particle

Claims (10)

A static electricity generating part that generates static electricity;
A conductive coupler connected to the conductor of the static electricity generating portion, a charged body connected to the conductive coupler and charged with the static electricity and having an upper surface inclined, and spaced apart from the lower side of the inclined surface And an electrostatic separation part which is horizontally provided to face the lower side and is made of an earth body insulated from the charged body,
A supply unit for supplying a non-magnetic metal-containing plastic pulverized product to the inclined surface of the charged body of the electrostatic separation unit,
A nonmagnetic metal-containing plastic is characterized in that nonmagnetic metal is separated from the pulverized nonmagnetic metal-containing plastic supplied to the inclined surface by using electrostatic repulsion. Electrostatic separation device.   The static electricity generation unit is connected to a centrifugal dust collector, a lower side of the centrifugal dust collector, a storage tank capable of storing a circulated product made of at least one of plastic crushed material and granular material, and the storage tank A circulation path is formed by a fan connected by the first pipe and the centrifugal dust collector and the second pipe, and one of the first pipe and the second pipe is a plastic pipe. The other part is a conductive pipe in the middle part and the part connected to both sides of the conductive pipe is a plastic pipe, and the circulating material circulates in the circulation path to generate static electricity in the conductive pipe. The electrostatic separation device for non-magnetic metal-containing plastics according to claim 1, wherein:   The electrostatic separator for non-magnetic metal-containing plastic according to claim 1, wherein the charged body is supported by the conductive connector.   4. The non-magnetic metal-containing plastic according to claim 1, wherein the conductive pipe is bent so that a frictional resistance between the circulating material and the conductive pipe is increased. Electric separation device.   The charged body is a conductive plate material, a plurality of the plate materials are arranged in the vertical direction, and adjacent upper and lower plate materials are arranged in a substantially U shape in a side view, and immediately below the lower edge of the upper plate material, The upper ends of the lower plate members are positioned apart from the lower end edges, separated from the lower end edges of each of the upper and lower multi-stage plate members, and the grounding bodies are respectively provided so as to face the lower end edges, The non-magnetic metal-containing plastic electrostatic separator according to any one of claims 1 to 4, wherein the non-magnetic metal is separated continuously by using an electrostatic repulsion action a plurality of times. An impact crusher for crushing non-magnetic metal-containing plastics;
The electrostatic separation device according to any one of claims 1 to 5,
A non-magnetic metal-containing plastic electrostatic separation system comprising: a transport device that transports the pulverized material pulverized by the impact pulverizer to a supply unit of the electrostatic separation device. A crushing step of crushing non-magnetic metal-containing plastic with an impact crusher;
A conveying step of conveying the pulverized product pulverized in the pulverizing step to the supply unit of the electrostatic separation device according to any one of claims 1 to 5;
An electrostatic separation method of a non-magnetic metal-containing plastic comprising: an electrostatic separation step of electrostatically separating the pulverized material conveyed by the conveyance step and supplied to the supply unit by an electrostatic separation unit of the electrostatic separation device.   The impact type pulverizer used in the pulverization step is a swing hammer crusher provided with a punching metal for regulating the size of a pulverized product or a screen having a mesh opening of 2 mm or more and 20 mm or less. 8. The method for electrostatic separation of a non-magnetic metal-containing plastic according to 7.   9. The method of electrostatic separation of a non-magnetic metal-containing plastic according to claim 7 or 8, wherein after the pulverization step, a sieve selection step of removing fine powder with a sieve is provided. The method for electrostatic separation of a non-magnetic metal-containing plastic according to any one of claims 7 to 9, wherein in at least one of the crushing step and the conveying step, magnetic metal is separated by magnetic separation.

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