Cable recycling method and cable recycling system

Abstract

To generate a recycled material that is easy to be reused in recycling a waste cable in a nuclear facility.SOLUTION: A cable recycling method solving the problem is a cable recycling method for recycling a waste cable in a nuclear facility, and includes: a cable diameter classification step of classifying, by the size of its diameter, at least one of a power cable and a power source cable, of the waste cable that is non-radioactive waste; a first-class copper wire take-out step of peeling off a covering material from the cable having a diameter equal to or more than a predetermined size, of the cable classified in the classification step, to obtain a first-class copper wire; and a copper nugget generation step of pulverizing the cable having a diameter less than the predetermined size, of the cable classified in the classification step, and separating the pulverized material into the covering material and copper nuggets to obtain the copper nuggets.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a cable recycling method and a cable recycling system for recycling waste cables of nuclear power facilities.

Background Art

[0002] Various waste materials are generated along with the operation and decommissioning of nuclear power facilities. Some of such waste materials are wastes not contaminated by radioactive substances (referred to as "wastes that are not radioactive waste (NR (Non radioactive Waste))"). The concept regarding the scope of this "waste that is not radioactive waste" is shown in the report of "Regarding the Criteria for the Disposal of Low-Level Radioactive Solid Waste on Land (Interim Report No. 2)" (February 14, 1992, Radioactive Waste Safety Standards Subcommittee of the Nuclear Safety Commission). Examples of wastes that are not radioactive waste include materials such as metals, concretes, glass fragments, waste oils, plastics, etc. installed in the management area (areas with and without the risk of contamination) of nuclear power facilities, and articles of tools used in the management area (areas with and without the risk of contamination) of nuclear power facilities that satisfy certain requirements. Such wastes that are not radioactive waste can be taken out of nuclear power facilities as industrial wastes and reused or disposed of, and have come to be in a situation of circulating in society.

[0003] Compared with the past, the scope of treatment as wastes that are not radioactive waste has a tendency to expand, and cables have also come to be treated as such wastes that are not radioactive waste.

[0004] However, there are also cases where they are not treated as such wastes that are not radioactive waste. In such cases, waste cables generated from nuclear power facilities are stored inside the nuclear power facilities until a reuse destination is determined. However, since the amount of waste cables generated from nuclear power facilities is large and they take up space, there is also a problem that a large storage space is required.

[0005] By the way, there are the following Patent Documents 1 to 9 regarding cable recycling. The waste wire recovery method disclosed in Patent Document 1 is an improvement on the method of separating a used electric wire into metal and coating and recovering the waste wire. Specifically, after crushing the used electric wire with a crusher, the crushed electric wire scraps are rolled with a rolling mill to separate them into a copper wire and a plastic coating, and finally, they are separated into coating powder and copper powder with a pneumatic separator. The content is disclosed.

[0006] The method for separating and recovering steel materials from waste electric wires disclosed in Patent Document 2 separates aluminum materials from waste electric wires partially using aluminum materials and separates and recovers copper wire materials. This method has the following first to third steps. First, in the first step, the waste electric wire is crushed and individually separated into a copper wire material, an aluminum material, and an insulating material containing plastic. Next, in the second step, the mixture of the copper wire material, aluminum material, and insulating material individually separated in the first step is applied to a wet or dry first specific gravity separator to separate the copper wire material and aluminum material from the insulating material. Then, in the third step, the copper wire material and aluminum material separated in the second step are further applied to a wet or dry second specific gravity separator to separate them into a copper wire material and an aluminum material.

[0007] The metal recovery method and metal separation recovery system from a metal electric wire disclosed in Patent Document 3, like Patent Documents 1 and 2, recover the core material, which is the metal component, from the metal electric wire. According to the invention of this Patent Document 3, when separating the peeled insulating material, there is an advantage that it is not necessary to introduce a dehydration, drying, and wet process and there is no use of chemicals.

[0008] The method for treating coated copper wire scraps disclosed in Patent Document 4 includes a copper slug sorting step of subjecting coated copper wire scraps to a nageotte treatment to obtain copper slugs and a coating resin, and a step of feeding the coating resin into a fluidized bed gasification melting furnace to thermally decompose the coating resin to obtain a solid recovery product containing copper. The copper slug sorting step includes a step (S1) of cutting the coated copper wire scraps, a step (S2) of performing primary crushing and magnetic separation, a step (S3) of performing secondary crushing and magnetic separation, and a step (S4) of separating and recovering copper slugs and resin materials from non-magnetic materials.

[0009] The method and apparatus for treating contaminated cables disclosed in Patent Document 5 include peeling the coating from the core wire of the cable, rolling the contaminated coating into a sheet shape by a heating roll, then winding it up by a treated sheath winder, measuring the degree of contamination by a dosimeter, recovering it into a drum can, and recovering the uncontaminated core wire.

[0010] In the decontamination method for wire materials and the like disclosed in Patent Document 6, the removed cables are first sorted into small-diameter materials and large-diameter materials. The small-diameter materials are cut into chips by a cutting machine and then frozen and hardened. Then, an impact is applied to make them into powder, which is separated into coating material powder and conductor fine pieces. On the other hand, the large-diameter materials are frozen and the coating material is crushed by an air hammer drill or the like, and the conductor part is wound up by a winding machine. Then, the powder of the coating material is liquefied by a heating and melting device and then solidified into a shape easy to store by cooling and stored. On the other hand, the conductor fine pieces and the wound-up conductor are reused through an acid washing process and a decontamination process.

[0011] Patent Document 7 discloses a method and apparatus for cutting a cable coating layer for reducing the amount of sealed containers used and the storage space when cutting the coating layer from a radiation-contaminated cable, separating it, and storing only the separated coating layer in a sealed container.

[0012] Patent Document 8 discloses a coating film peeling device for cables and the like, which coats and transports long objects such as cables to be transported into RI facilities including nuclear power plants with a synthetic resin film, and peels off the coating layer when transporting the cables and the like out of the management area.

[0013] Prior Art Document 9 discloses a method for removing a cable, in which the coating layer of a cable laid in a radiation management area is peeled off within the radiation management area and only the core is taken out of the non-management area before taking the cable out of the radiation management area.

Prior Art Documents

Patent Documents

[0014]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Patent Document 6

Patent Document 7

Patent Document 8

Patent Document 9

Summary of the Invention

Problems to be Solved by the Invention

[0015] As shown in the above Patent Documents 1 to 9, there are various processing devices and processing methods for recycling waste cables.

[0016] However, there are various types of waste cables generated from nuclear power facilities. The diameter, structure, composition, etc. vary depending on the type, and it is necessary to change the treatment method accordingly.

[0017] If waste cables of various sizes, structures, and compositions are recycled together, the quality of the composition of the recycled material will deteriorate. As a result, the selling price of the recycled material may decrease, or the destinations for reuse may be limited.

[0018] Therefore, an object of the present invention is to produce a recycled material that is easy to reuse when recycling waste cables generated from nuclear power facilities.

Means for Solving the Problems

[0019] The present invention that solves the above problems is as follows.

[0020] (First Aspect) A cable recycling method for recycling waste cables of a nuclear power facility, comprising: a cable diameter classification step of classifying at least one of power cables and power supply cables among the waste cables that are non-radioactive waste according to the size of the diameter; a pickled copper wire extraction step of peeling a coating material from the cables having a diameter equal to or greater than a predetermined size among the cables classified in the cable diameter classification step to obtain pickled copper wire; a copper nugget generation step of crushing the cables having a diameter less than a predetermined size among the cables classified in the cable diameter classification step and separating the crushed material into a coating material and copper nuggets to obtain copper nuggets. A cable recycling method characterized by the above.

[0021] (Function and Effect) In this aspect, the waste cable, which is non-radioactive waste, is transferred to the subsequent picar copper wire extraction process or copper ingot generation process, and other waste cables are not transferred to those processes. Therefore, it is possible to prevent the occurrence of a situation where the obtained picar copper wire or copper ingot cannot be reused due to radiation.

[0022] Furthermore, in this aspect, at least one of a power cable and a power supply cable is extracted from the waste cable, which is non-radioactive waste. While the power cable and the power supply cable are used in the subsequent copper ingot generation process, the control cable and the data cable are not used in the subsequent copper ingot generation process. By doing so, the copper ingot obtained in the copper ingot generation process contains almost no impurities such as plated ingots. That is, when the control cable and the data cable are made into ingots, the ingots contain some impurities such as plated ingots. However, by not using the control cable and the data cable in the copper ingot generation process, the quality of the copper ingot obtained in the copper ingot generation process can be maintained.

[0023] Furthermore, in this aspect, after extracting at least one of the power cable and the power supply cable, the extracted cable is further sorted by the size of the diameter, and is allocated to either the picar copper wire extraction process or the copper ingot generation process according to the size of the diameter. When trying to extract picar copper wire from a cable with a diameter less than a predetermined size, it is time-consuming because the diameter is small. However, by limiting the object for extracting picar copper wire to a cable with a diameter greater than or equal to the predetermined size, the occurrence of such time-consuming work can be suppressed.

[0024] If the waste cable, which is non-radioactive waste, can be sold as non-radioactive waste, there is an effect that it can be sold at a higher price by making it into picar copper wire or copper ingots rather than selling miscellaneous waste cables as they are.

[0025] In addition, by pre-processing waste cables into PIC copper wires or copper ingots, they can be immediately reused as copper resources, making reuse easy. That is, when waste cables are stored in their original state, if one wants to reuse the copper contained in the waste cables, it is necessary to start with the operation of processing the waste cables into PIC copper wires or copper ingots, which requires a lot of time and labor. However, by performing these operations in advance and then storing them, when attempting to reuse the copper contained in the waste cables, there is the advantage that the copper resources contained in the waste cables can be immediately utilized.

[0026] Also, if a series of the above-mentioned steps of this embodiment are carried out within the premises of a nuclear power facility, the following effects can also be obtained.

[0027] That is, generally, a large number of cables are included in the waste materials generated from nuclear power facilities, and since the cables take up space, there is a problem that a large storage space is required. If the waste cables are separated into copper (PIC copper wires or copper ingots) and the coating material within the premises of the nuclear power facility, the storage space required can be reduced compared to the case of storing the miscellaneous waste cables as they are. In particular, when the waste cables are made into copper ingots, the storage space required can be significantly reduced.

[0028] Also, when selling waste cables to the outside, the following procedure is assumed to be followed. That is, first, the operator of the nuclear power facility stores the waste cables as they are within the premises of the facility, and the operator sells them to the winning bidder through a competitive bid. The winning bidder transports the winning bid waste cables out of the nuclear power facility premises to an off-site temporary storage location and stores them temporarily at the temporary storage location. Thereafter, the winning bidder sells the waste cables to a recycling company and transports the waste cables to the storage location of the recycling company. Then, the recycling company extracts PIC copper wires and ingot copper from the waste cables and sells the PIC copper wires and ingot copper to other companies. If the above procedure is followed in the process of reusing waste cables, since the waste cables are transported many times, there is a problem that the amount of CO2 emissions associated with transportation increases.

[0029] When each step of the series of steps in this aspect is carried out within the precincts of a nuclear power facility, the following advantages occur. That is, the operator of the nuclear power facility can take out picar copper wire and naget copper from the waste cable within the precincts of the facility and sell this picar copper wire and naget copper to the merchants who need it. As a result, the above-mentioned winning bidder and recycler are prevented from intervening, and the number of transports can be reduced. Therefore, the amount of CO2 emissions associated with transport can be reduced, and it is possible to contribute to the SDGs and carbon neutrality.

[0030] Since the waste cable, which is non-radioactive waste, is non-radioactive waste, it is easy to take out this waste cable outside the nuclear power facility as non-radioactive waste. Therefore, it becomes possible to take out the waste cable, which is non-radioactive waste, outside the precincts of the nuclear power facility without processing it and carry out the series of steps of this aspect outside the precincts of the nuclear power facility. As a result, there is an advantage that it is not necessary to secure a large storage space for storing the waste cable in the limited precincts of the nuclear power facility.

[0031] (Second Aspect) A cable recycling method for recycling the waste cable of a nuclear power facility, Among the waste cables that are non-radioactive waste, it has a miscellaneous naget generation step of pulverizing at least one of the control cable and the data cable, and separating the pulverized material into a coating material and miscellaneous naget to obtain miscellaneous naget. A cable recycling method characterized by this.

[0032] (Function and Effect) In this aspect, the waste cable, which is non-radioactive waste, is transferred to the subsequent miscellaneous naget generation step, and the other waste cables are not transferred to the miscellaneous naget generation step. Therefore, it is possible to prevent the occurrence of a situation where it cannot be reused due to radiation.

[0033] Furthermore, in this aspect, at least one of a control cable and a data cable is extracted from the waste cable. Generally, the selling price of the miscellaneous wire obtained from a control cable or a data cable tends to be lower than that of the picar copper wire or copper wire, but there is an advantage that it can be sold at a higher price by making it into miscellaneous wire rather than selling the control cable or data cable as it is.

[0034] Also, by pre-processing the waste cable into miscellaneous wire in advance, they can be immediately reused as resources. That is, there is an advantage that reuse is easy.

[0035] Also, if the miscellaneous wire generation process of this aspect is performed within the premises of a nuclear power facility, the same operational effects as those described in the column of the operational effects of the first aspect can also be obtained. Since this point is a duplicate description, it is omitted.

[0036] (Third Aspect) A cable recycling system for recycling waste cables of a nuclear power facility, The cable recycling system, has a coating material peeling machine for peeling the coating material from the waste cable, The waste cable supplied to the coating material peeling machine, is at least one cable selected from a power cable with a diameter equal to or larger than a predetermined size and a power supply cable with a diameter equal to or larger than a predetermined size, and is a waste cable that is a non-radioactive waste, A cable recycling system characterized by this.

[0037] (Operational Effects) According to the cable recycling system of this aspect, picar copper wire can be obtained from a power cable or a power supply cable with a diameter equal to or larger than a predetermined size among waste cables that are non-radioactive wastes. As a result, the same operational effects as those of the first aspect can be obtained.

[0038] Furthermore, when the cable recycling system of this aspect is installed within the premises of a nuclear power facility, the same effects as those described in the column of the effects of the first aspect (the effects obtained by performing each process within the premises of the nuclear power facility) can be obtained.

[0039] In this aspect, since the waste cable, which is non-radioactive waste, is supplied to the coating material peeling machine, the safety is high.

[0040] Note that the cable recycling system of this third aspect can be suitably used for the cable recycling method of the first aspect.

[0041] (Fourth Aspect) A cable recycling system for recycling waste cables of a nuclear power facility, The cable recycling system, A miniaturization device for making the waste cable smaller, A wet specific gravity separator for separating the small object made smaller by the miniaturization device into a coating material and a naget using a liquid, A dehydrator for dehydrating the separated naget, A dryer for drying the dehydrated naget, It has exhaust equipment for dust discharged from at least one of the miniaturization device and the wet specific gravity separator, The waste cable supplied to the miniaturization device, Is at least one cable selected from the group consisting of a power cable with a diameter less than a predetermined size, a power supply cable with a diameter less than a predetermined size, a control cable, and a data cable, and Is a waste cable that is non-radioactive waste, A cable recycling system characterized by this.

[0042] (Effects) According to the cable recycling system of this aspect, among waste cables that are non-radioactive waste, at least one cable selected from the group of power cables, power supply cables, control cables, and data cables with a diameter less than a predetermined size can be used to generate nuggets.

[0043] When the cable recycling system of this aspect is installed within the premises of a nuclear power facility, the same effects as those described in the column of the effects of the first aspect (the effects obtained by performing each process within the premises of the nuclear power facility) can be obtained.

[0044] Regarding each of the cables (power cables, power supply cables, control cables, data cables) to be processed by the cable recycling system of this aspect, there is a risk that the dust generated in the crushing and pulverizing processes may have an adverse impact on the working environment and quality. Therefore, by exhausting the dust discharged from at least one of the miniaturization device and the wet specific gravity separator as in this aspect, the diffusion of the dust and the like can be prevented, the deterioration of the working environment can be prevented, and the safety of operators of each machine can be ensured. In addition, the adhesion of fine powder and the like can be suppressed, and the purity of the obtained nuggets can be maintained.

[0045] Note that in this aspect, since waste cables that are non-radioactive waste are supplied to the miniaturization device, the safety is high.

[0046] From the perspective of preventing the diffusion of the dust and the like, it is preferable to perform exhaust treatment from as many machines as possible among the miniaturization device and the wet specific gravity separator, and it is most preferable to perform exhaust treatment from all of these machines.

[0047] The type of the miniaturization device is not particularly limited. For example, a miniaturization device can be mentioned which includes a crusher that is supplied with waste cables and crushes the supplied waste cables, a grinder that grinds the crushed materials crushed by the crusher, and a moving path for the crushed materials that connects between the crusher and the grinder. In addition, a miniaturization device having only the crusher and the grinder without the moving path can also be exemplified. As described above, the miniaturization device only needs to be able to reduce the waste cable to a size about the size of a nugget, and the structure of the machine and the like are not particularly limited.

[0048] Note that the cable recycling system of this fourth aspect can be suitably used for the cable recycling methods of the first aspect and the second aspect.

[0049] (Fifth Aspect) A cable recycling system for recycling waste cables of nuclear facilities, The cable recycling system, a miniaturization device for reducing the waste cable, a dry specific gravity separator for separating the small objects reduced by the miniaturization device into a coating material and a nugget, exhaust equipment for dust discharged from at least one of the miniaturization device and the dry specific gravity separator, The waste cable supplied to the miniaturization device, is at least one cable selected from the group consisting of a power cable having a diameter less than a predetermined size, a power supply cable having a diameter less than a predetermined size, a control cable, and a data cable, and is a waste cable that is a non-radioactive waste, characterized by a cable recycling system.

[0050] (Function and Effect) In this aspect, a dry specific gravity separator is used. When a dry specific gravity separator rather than a wet specific gravity separator is used as the separator, dust and the like are likely to leak, so it is preferable to exhaust the dust from this dry specific gravity separator. Therefore, by adopting the configuration as in this aspect, the same operational effects as those in the fourth aspect can be obtained.

[0051] In addition, in this aspect, since a waste cable, which is non-radioactive waste, is supplied to the miniaturization device, the safety is high.

[0052] In addition, this cable recycling system of the fifth aspect can also be suitably used for the cable recycling methods of the first aspect and the second aspect.

[0053] (Sixth Aspect) A cable recycling system for recycling waste cables of a nuclear facility, The cable recycling system includes a crusher to which the waste cable is supplied and that crushes the supplied waste cable, a grinder that grinds the crushed material crushed by the crusher, a moving path for the crushed material connecting between the crusher and the grinder, a wet specific gravity separator that separates the ground material ground by the grinder into a coating material and a reject using a liquid, a dehydrator that dehydrates the separated reject, a dryer that dries the dehydrated reject, and an exhaust facility for dust discharged from at least one selected from the group consisting of the crusher, the grinder, and the wet specific gravity separator, The waste cable supplied to the crusher is at least one cable selected from the group consisting of a power cable having a diameter less than a predetermined size, a power supply cable having a diameter less than a predetermined size, a control cable, and a data cable, and is a waste cable that is non-radioactive waste, A cable recycling system characterized by the above.

[0054] (Function and effect) For example, when the moving path is one that moves crushed materials while keeping them stationary, such as a belt conveyor, harmful dust and dirt are less likely to be generated. Therefore, it may not be necessary to provide exhaust equipment on the moving path. Of course, it may also be provided.

[0055] In addition, since the dehydrator and dryer are equipment located at the latter stage of the cable recycling system, it is highly likely that the dust and dirt generated during crushing and pulverization have been removed by the time they reach the dehydrator and dryer. Therefore, the amount of dust and dirt contained in the exhaust from the dehydrator and dryer generally tends to be extremely small. Therefore, it may not be necessary to provide exhaust equipment for the dehydrator and dryer. Of course, it may also be provided.

[0056] Note that this cable recycling system of the sixth aspect can also be suitably used in the cable recycling methods of the first aspect and the second aspect.

[0057] (Seventh aspect) An exhaust gas purification device equipped with a metal exhaust gas purification filter for removing the dust, and A residual dust removal device provided at the latter stage of the exhaust gas purification device for removing the dust remaining in the purified exhaust gas discharged from the exhaust gas purification device, The residual dust removal device has a residual dust removal filter having a particle collection rate of 99.97% or more with respect to the dust having a particle size of 0.3 μm remaining in the purified exhaust gas, The cable recycling system according to any one of claims 4 to 6.

[0058] (Function and effect) It is preferable to purify the exhaust gas containing dust. By installing an exhaust gas purification device equipped with a metal exhaust gas purification filter for removing the dust, and a residual dust removal device provided at the latter stage for removing the dust remaining in the purified exhaust gas discharged from the exhaust gas purification device, harmful exhaust gas is not emitted, and environmental conservation becomes possible.

[0059] (Eighth aspect) In the wet specific gravity separator, A liquid circulation path for circulating the liquid used in the wet specific gravity separator and supplying it again to the wet specific gravity separator is connected. In the liquid circulation path, A purification device for purifying the used liquid passing through the liquid circulation path is attached. The purification device is A contaminated liquid spraying unit for spraying a contaminated liquid which is the used liquid passing through the liquid circulation path, A freezing coil for freezing a part of the contaminated liquid sprayed from the liquid spraying unit that does not contain dust and attaching it to the outer surface, An impure liquid discharge port for discharging the remaining part of the contaminated liquid sprayed from the liquid spraying unit that contains dust, After stopping the spraying of the liquid from the liquid spraying unit, a dissolution promoting liquid spraying unit for spraying a dissolution promoting liquid for dissolving the frozen matter formed on the outer surface of the freezing coil, And a non-impure liquid discharge port for discharging the liquid that does not contain dust and is dissolved by the dissolution promoting liquid sprayed from the dissolution promoting liquid spraying unit. The cable recycling system according to the fourth aspect or the sixth aspect, configured such that the liquid that does not contain dust discharged from the non-impure liquid discharge port is used in the wet specific gravity separator.

[0060] (Function and effect) When a wet specific gravity separator is used as a separator in the cable recycling system, a liquid (for example, water) for separation is required. In this aspect, the liquid is configured to be circulated and used, so that the liquid can be effectively utilized.

[0061] In addition, as the liquid is circulated and used, the concentration of harmful substances in the liquid derived from dust and the like may gradually increase. Therefore, a purification device is provided in the liquid circulation path to remove harmful substances from the liquid used in circulation. As a method for removing harmful substances from the liquid, a method using a filter can be considered. In this method using a filter, a large amount of cake containing harmful substances is generated, and there is a problem that a place for disposing of the cake needs to be secured.

[0062] Therefore, in the cable recycling system of this embodiment, a freezing coil is used to concentrate harmful substances, and the concentrated harmful substances are discarded. According to such a system, since there is no such problem that a large amount of the above-mentioned cake is generated, there is an advantage that the amount of harmful substances to be discarded can be reduced.

Advantages of the Invention

[0063] According to the present invention, when recycling waste cables of nuclear power facilities, recyclable materials that are easy to reuse can be generated.

Brief Description of the Drawings

[0064]

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Embodiments for Carrying Out the Invention

[0065] Hereinafter, preferred embodiments of the present invention will be described. Note that the following description and drawings only show one embodiment of the present invention, and the content of the present invention should not be construed as being limited to this embodiment.

[0066] (Non-radioactive waste) In this specification and the claims, non-radioactive waste refers to waste generated from at least one of the controlled areas where there is no risk of contamination in nuclear facilities and the controlled areas where there is a risk of contamination, among which nuclear raw materials, nuclear fuel materials, and the Law Concerning the Regulation of Nuclear Reactors (Law No. 166 of June 10, 1957) are not subject to the regulations based on the law, and are appropriately disposed of or effectively utilized as resources in accordance with relevant laws and regulations such as the Law Concerning the Disposal and Cleaning of Waste (Law No. 137 of 1970). Specifically, it is judged by the methods described in the report "Regarding the Standard Values for the Safe Disposal of Low-Level Radioactive Solid Waste on Land (Second Interim Report)" (February 14, 1992, the Special Committee on Radioactive Waste Safety Standards of the Atomic Energy Safety Commission), the former Atomic Energy Safety and Security Agency's Instruction Document "Regarding the Handling of 'NR' in Nuclear Facilities (Instruction) (NISA-111a-08-1) (April 21, 2008, the First Document of the former Atomic Energy Commission), etc. Note that NR refers to "waste that is not radioactive waste". In the former Nuclear and Industrial Safety Agency Instruction Document "Regarding the Handling of 'NR' in Nuclear Facilities (Instruction) (NISA-111a-08-1) (Original Agency No. 1, April 21, 2008)", the scope of waste for which NR judgment is to be made, the judgment method, and the handling of NR, etc. are specified. Examples of the waste subject to NR judgment include (a) materials and the like installed in nuclear facilities that were installed in a control area where there is no risk of contamination, and (b) those used in a control area where there is a risk of contamination. Here, the control area refers to a place where there is a risk of exceeding the value announced by the competent minister regarding the dose related to external radiation, the concentration of radioactive substances in the air, or the density of radioactive substances on the surface of objects contaminated by radioactive substances, and is set in the security regulations approved by the competent minister. Regarding the NR judgment, for the above (a), it applies when, after confirming that appropriate contamination prevention measures have been taken, it is determined that there is no contamination based on properly managed usage history, records of installation status, etc. For the above (b), when it is determined that there is no contamination based on properly managed usage history, records of installation status, etc. after confirming that appropriate contamination prevention measures have been taken, for contaminated materials and the like, if the contaminated part has been identified and separated, the remaining non-contaminated part applies. Here, examples of "appropriate pollution prevention measures" include, for item (a) above, partitioning areas by walls or the like between areas with a risk of contamination and areas without a risk of contamination, partitioning areas by ensuring an air flow from an area without a risk of contamination toward an area with a risk of contamination (ventilation function), encapsulating radioactive substances in containers or the like for handling, storage, or preservation, conducting an impact assessment of neutrons based on neutron dose measurement results, activation calculations, etc. For item (b) above, when opening equipment or the like containing substances contaminated by nuclear fuel materials, partitioning the area using a greenhouse, local exhaust ventilation equipment, etc., providing surface protection from substances contaminated by nuclear fuel materials using heat insulation materials, etc., applying water-resistant paint or the like to the floor and wall surfaces of the building in areas with a risk of contamination, partitioning the area by installing equipment or the like containing substances contaminated by nuclear fuel materials in an independent compartment or installing a weir or the like around it, conducting an impact assessment of neutrons based on neutron dose measurement results, activation calculations, etc., checking the surface contamination density by controlling access to people and objects entering and leaving the area, regularly measuring the surface contamination density within the area, and checking the contamination status at each work process, etc. "Properly managed usage history, installation status records, etc." refers to records and other materials properly managed based on security regulations and quality assurance plans. "Identification and separation of contaminated sites" means that in the case of permeation contamination, after separating the site assumed to be the contaminated site by peeling or the like, the contamination range is evaluated by an appropriate measurement method, and from the perspective of enhancing reliability, peeling or the like is also carried out with a margin for non-contaminated sites. Those determined by nuclear power operators to be NR are not subject to the regulations based on the Act on the Regulation of Nuclear Source Materials, Nuclear Fuel Materials and Reactors (Act No. 166 of June 10, 1957), and shall be appropriately disposed of or effectively utilized as resources in accordance with relevant laws and regulations such as the Act on the Disposal and Cleaning of Waste (Act No. 137 of 1970). In the case where the above laws and regulations are amended, non-radioactive waste is determined in accordance with the amended laws and regulations. Further, when a cable is regarded as an object for NR determination as materials or the like installed in a nuclear facility, non-radiation waste is synonymous with "waste that is not radioactive waste".

[0067] (Cable recycling method) Fig. 1 shows a flowchart of a cable recycling method according to the first embodiment. When decommissioning a nuclear facility or reforming a part of a nuclear facility, a waste cable 33 is generated from the cables used in the nuclear facility. In the cable recycling method, the waste cable that is non-radioactive waste is targeted, and other waste cables are not targeted. Valuable resources such as picar copper wire, copper nuggets, and miscellaneous nuggets are recovered from the waste cable 33.

[0068] The procedure of the cable recycling method is as follows. Since the waste cable 33 is a waste cable that is non-radioactive waste, it is a waste cable that can be reused without peeling the coating material of the waste cable 33, and thus is processed according to the steps in Fig. 1.

[0069] (Cable type classification step) In this cable type classification step, the cables are classified by type. Specifically, they are classified into power cables, power supply cables, control cables, and data cables. As shown in Fig. 1, since the "power cable and power supply cable" have the same subsequent flow, they may be classified together. For the same reason, the "control cable and data cable" may also be classified together.

[0070] (Power cable, power supply cable) The power cables and power supply cables classified by the cable type classification process are further classified in the cable diameter classification process. Specifically, among the power cables and power supply cables, cables with a diameter (referring to the outer diameter of the cable; the same applies hereinafter) equal to or greater than a predetermined value will proceed to the pick-up copper wire extraction process. In the pick-up copper wire extraction process, pick-up copper wires are obtained by peeling the coating material of the power cables or power supply cables. On the other hand, among the power cables and power supply cables, cables with a diameter less than the predetermined value will proceed to the copper slug generation process. In the copper slug generation process, copper slugs are obtained by separating the coating material and the copper slugs after cutting the power cables or power supply cables.

[0071] In the cable diameter classification process, the diameter serving as the criterion for classifying the cables can be arbitrarily determined. For example, when using a coating material peeling machine in the pick-up copper wire extraction process, the diameter recommended by this coating material peeling machine may be used as the basis for the predetermined value. Specifically, when the diameter of the cables that can be processed by the coating material peeling machine used in the pick-up copper wire extraction process is 10 mm to 40 mm, it is preferable to set the predetermined value in the pick-up copper wire extraction process to 10 mm and only process power cables and power supply cables with a diameter of 10 mm or more in the pick-up copper wire extraction process. In this case, if there are also cables with a diameter greater than 40 mm, it is desirable to prepare another coating material peeling machine that can process cables with a diameter of 40 mm or more in order to be able to extract pick-up copper wires from such cables as well.

[0072] In addition, the predetermined value used in the cable diameter classification process may be determined based on the equipment constraints of the slug generation plant used in the copper slug generation process, for example, when using the slug generation plant used in the copper slug generation process. For example, when the diameter of the cables that can be crushed by the crusher of the slug generation plant is generally 30 mm or less, it is advisable to set the predetermined value to 30 mm and not target cables with a diameter greater than 30 mm for the copper slug generation process.

[0073] (Control cables, data cables) The control cables and data cables classified by the cable type classification process are turned into random scraps through the random scrap generation process. Specifically, random scraps are obtained by separating the coating material and random scraps after cutting the control cables and data cables. In this random scrap generation process, for example, the same plant as the scrap generation plant used in the copper scrap generation process can be used.

[0074] (Cable recycling system related to coating material peeling machine) Next, with reference to FIG. 2, the cable recycling system 1 related to the coating material peeling machine will be described.

[0075] The cable recycling system 1 related to the coating material peeling machine shown in FIG. 2 includes a coating material peeling machine 30 for peeling the coating material outside the waste cable 33, a peeling machine exhaust hood 6 provided so as to cover the coating material peeling machine 30 and its working area 2, and an exhaust purification device 3 provided at the rear stage of the peeling machine exhaust hood 6 and having a metal exhaust purification filter 7 for removing the dust from the exhaust containing the dust generated in the working area 2 of the coating material peeling machine 30, and a residual dust removal device 4 provided at the rear stage of the exhaust purification device 3 for removing the remaining dust in the purified exhaust discharged from the exhaust purification device 3.

[0076] In addition, the cable recycling system 1 shown in FIG. 2 is provided with a suction fan 5 for sucking the air containing dust in the working area 2 at the rear stage of the residual dust removal device 4, and a pre-duster 31 for removing the dust in the exhaust containing the dust exhausted from the working area 2 is provided between the peeling machine exhaust hood 6 and the exhaust purification device 3.

[0077] In the cable recycling system 1 related to the coating material peeling machine, since the generation of dust and the like is extremely small, the peeling machine exhaust hood 6, the pre-duster 31, and the exhaust purification device 3 provided downstream of the peeling machine exhaust hood 6 and including a metal exhaust purification filter 7 for removing the dust from the exhaust gas containing the dust generated in the working area 2 of the coating material peeling machine 30, and the residual dust removal device 4 provided downstream of the exhaust purification device 3 for removing the dust remaining in the purified exhaust gas discharged from the exhaust purification device 3 can be omitted.

[0078] In the following description, the details of the cable recycling system 1 related to the coating material peeling machine shown in FIG. 2 will be described.

[0079] (Working area 2) The coating material peeling machine 30 is placed in the working area 2, and the worker 32 inserts the waste cable 33 into the insertion port 30A of the coating material peeling machine 30. The coating material outside the waste cable 33 inserted into the insertion port 30A is peeled off by the coating material peeling machine 30. The cable with the coating material peeled off is the above-mentioned pickled copper wire 34.

[0080] That is, the pickled copper wire extraction step is performed by the coating material peeling machine 30 placed in the working area 2. Specifically, in the pickled copper wire extraction step, a power cable or a power supply cable with a cable diameter of a predetermined value or more is inserted into the coating material peeling machine 30 to obtain a pickled copper wire 34 with the coating material peeled off.

[0081] The structure of the waste cable 33 varies depending on whether it is single-core or multi-core. In the case of a single-core cable, it is generally in the form shown in FIG. 3. That is, as shown in the upper part of FIG. 3, a pickled copper wire 34 serving as a conductor is located at the center, an insulator 35 is arranged so as to cover the outside thereof, and a sheath 36 is arranged so as to cover the outside of the insulator 35. At this time, the part covering the outside of the pickled copper wire 34, that is, the insulator 35 and the sheath 36 are collectively referred to as the coating material 37. The material of the insulator 35 is generally cross-linked polyethylene, and the material of the sheath 36 is generally vinyl.

[0082] Insert the waste cable 33 into the insertion port 30A of the coating material peeling machine 30. By peeling the coating material 37 of the waste cable 33 using the coating material peeling machine 30, the waste cable 33 can be separated into a pickled copper wire 34, an insulator 35, and a sheath 36.

[0083] If dust adheres to the outside of the coating material 37, there is a possibility that the dust will scatter in the working area 2 where the coating material 37 is peeled from the waste cable 33 using the coating material peeling machine 30, deteriorating the working environment of the worker 32 working in the working area 2.

[0084] Therefore, it is preferable to provide an exhaust hood 6 so as to three-dimensionally cover this working area 2, actively suck the air in the exhaust hood 6 from the suction port 6A, discharge the dust generated in the working area 2 from the working area 2, and make the working environment in the working area 2 good. Further, since the inside of the working area 2 becomes negative pressure due to the suction, it is possible to prevent the dust in the working area 2 from being released to the outside from unintended locations. Note that the suction from the exhaust hood 6 can be performed by, for example, a suction fan 5 provided in the subsequent stage.

[0085] (Preduster 31) The exhaust air AH discharged from the working area 2 is supplied to the preduster 31 through the exhaust ventilation pipe L1. The type of this preduster 31 is not particularly limited, and for example, a cyclone or the like can be used. By this preduster 31, dust larger than the dust contained in the exhaust air EH, cotton-like dust, etc. are removed.

[0086] Note that the preduster 31 is not necessarily provided, but it is preferably provided as much as possible for reasons such as preventing clogging of the subsequent exhaust gas purification device 3.

[0087] (Exhaust gas purification device 3) The dust-removed exhaust gas EH from which the dust discharged from the pre-duster 31 has been removed is supplied to the exhaust gas purification device 3 through the dust-removed exhaust gas ventilation pipe L2. An exhaust gas purification filter 7 is housed inside the exhaust gas purification device 3. As shown in FIGS. 4 to 7, this exhaust gas purification filter 7 is formed in a cylindrical shape. Although FIGS. 4 to 7 illustrate an example in which the cross-sectional shape of the exhaust gas purification filter 7 is a perfect circle, the present invention is not limited to this example, and any shape such as an elliptical shape, a rectangular shape, or a hexagonal shape may be used. The configuration of the exhaust gas purification filter 7 is not particularly limited, but a metal fiber sheet (referred to as a metal fiber sheet, which constitutes the main filter 14 described later) formed by gathering a plurality of metal fibers into a sheet shape, and the upper and lower surfaces of the metal fiber sheet are each sandwiched between metal mesh-like members (referred to as metal mesh-like members, which constitute the shape holding means 15 described later). It is preferable to use. As the metal fibers of the metal fiber sheet, stainless steel fibers, tungsten steel fibers, aluminum fibers, nickel fibers, titanium fibers, etc. can be used. Among these metal fibers, it is most preferable to use stainless steel fibers (that is, stainless steel fibers). Hereinafter, a stainless steel fiber sheet using stainless steel fibers as the metal fibers will be described as an example. That is, in the following description, the stainless steel fiber sheet can be read as the metal fiber sheet.

[0088] The stainless steel fiber sheet may be formed by bending a single long stainless steel fiber many times into a sheet shape. A photograph of the stainless steel fiber sheet is shown in FIG. 8. The diameter of the stainless steel fiber (fiber diameter) is preferably about 2 to 5 μm of the nominal fiber diameter, and the fiber diameter may be selected according to the particle size distribution of the generated dust. Further, in order to increase the removal rate of the dust in the dust-removed exhaust gas EH, the porosity of the stainless steel fiber sheet is preferably 65 to 80%. And it is preferable that the performance of the exhaust gas purification filter 7 has a particle collection rate of 90% or more with respect to the dust having a particle size of 0.3 μm or more remaining in the dust-removed exhaust gas EH.

[0089] Also, it is preferable to avoid replacing the exhaust gas purification filter 7 as much as possible. Since the exhaust gas purification filter 7 has a main filter and the main filter includes a metal fiber sheet, the replacement frequency of the exhaust gas purification filter 7 can be reduced. That is, for such an exhaust gas purification filter 7, even when a large amount of dust or the like adheres to the exhaust gas purification filter 7 and the purification ability of the exhaust gas purification filter 7 decreases, backwashing using the compressed gas PA can be performed to regenerate the exhaust gas purification filter 7. Therefore, it is not necessary to replace the exhaust gas purification filter every time a large amount of dust or the like adheres to the exhaust gas purification filter 7, and it is not necessary to replace the filter of the exhaust gas purification filter 7 for a long time. In addition, it is also possible to stop the purification treatment of the exhaust gas EH accompanying the filter replacement and reduce the costs related to the replacement and disposal of the exhaust gas purification filter 7.

[0090] Moreover, even if sharp fine powder or the like is contained in the dust-removed exhaust gas EH, there is little risk of the exhaust gas purification filter 7 being damaged by this fine powder or the like. From this point as well, the replacement frequency of the exhaust gas purification filter 7 can be reduced. Furthermore, since the main filter of the exhaust gas purification filter 7 includes a metal fiber sheet, it is also possible to prevent the exhaust gas purification filter 7 from catching fire and causing a fire.

[0091] The exhaust gas purification filter 7 may be simply formed by shaping a flat stainless steel fiber sheet into a cylindrical shape. However, for the purpose of increasing the filtration area, as shown in FIG. 7, it is preferable to use a filter formed by folding a flat stainless steel fiber sheet into a bellows shape and then forming it into a cylindrical shape. Further, as shown in FIG. 7, it is most preferable that the exhaust gas purification filter 7 is configured such that shape retaining means 15 for protecting the main filter 14 is provided on both sides (the front surface and the back surface) of the main filter 14. However, the shape retaining means 15 may be provided on one side (the front surface or the back surface) of the main filter 14. By providing the shape retaining means 15, it becomes easier to maintain the exhaust gas purification filter 7 in the above-described bellows shape. That is, since the stainless steel fiber sheet constituting the main filter 14 has low form stability, it is difficult to maintain the bellows shape without the net-like sheet constituting the shape retaining means 15. However, by providing the shape retaining means 15, the form stability of the exhaust gas purification filter 7 is increased and the bellows shape can be maintained. Further, by providing the shape retaining means 15, the strength of the exhaust gas purification filter 7 is increased, so that it becomes easier to withstand the pressure of the compressed gas applied to the main filter 14 when the main filter 14 is cleaned.

[0092] Note that since the filtration area increases by forming the exhaust gas purification filter 7 into a bellows shape, there is an advantage that the exhaust gas purification processing amount per unit time can be increased without increasing the size of the container (the container of the exhaust gas purification device) for housing the exhaust gas purification filter 7.

[0093] In order to allow the dust removal exhaust gas EH to reach the main filter 14, the shape retaining means 15 is preferably a net-like sheet. Further, if the voids of the mesh of the shape retaining means 15 are small, the exhaust gas filtration processing amount per unit time decreases and the risk of the shape retaining means 15 becoming clogged increases. Therefore, it is preferable that the size of the voids of the mesh of the shape retaining means 15 is larger than the size of the voids of the main filter 14. Furthermore, it is preferable to use stainless steel or the like as the material of the shape retaining means 15.

[0094] Figs. 9 and 10 show a stacked example of the main filter 14 and the shape retention means 15 that constitute the exhaust purification filter 7. In Figs. 9 and 10, the front side and the upper side mean the outside (the side where the container 28 of the exhaust purification device 3 is located) when the exhaust purification filter 7 is attached to the exhaust purification device 3, and the back side and the lower side mean the inside (the side where the inner cylinder 8 is located) when the exhaust purification filter 7 is attached to the exhaust purification device 3. Since the main filter 14 includes a metal fiber sheet and the shape retention means 15 includes a metal mesh member, it can also be said that the exhaust purification filter 7 is a laminate of a metal fiber sheet and a metal mesh member. Note that the main filter 14 may contain substances other than the metal fiber sheet, and the shape retention means 15 may also contain substances other than the metal mesh member. It is preferable to use a metal fiber sheet (particularly a stainless steel fiber sheet) as the main material of the main filter 14, and it is preferable to use a metal mesh member as the main material of the shape retention means 15. The main filter 14 may be composed only of a metal fiber sheet, and the shape retention means 15 may be composed only of a metal mesh member. Also, in Figs. 9 and 10, for easy understanding, the thicknesses of the respective layers that constitute the exhaust purification filter 7 are emphasized and shown thick, but the actual thicknesses of the respective layers are not limited to such thicknesses.

[0095] In Fig. 9, a three-layer structure is formed by laminating the shape-retaining means 15 on the front side US (outer side) of the main filter 14 and also laminating the shape-retaining means 15 on the back side DS (inner side) of the main filter 14. From the viewpoint of protecting the main filter 14 and from the viewpoint of forming the main filter 14 into a bellows shape and maintaining that bellows shape, it is most preferable to provide the shape-retaining means 15 on both sides (front side US and back side DS) of the main filter 14 as shown in Fig. 9. However, it may also be in a form where the shape-retaining means 15 is provided on either one side (front side US or back side DS) of the main filter 14. When it is not necessary to protect the main filter 14 and it is also not necessary to form the main filter 14 into a bellows shape, the shape-retaining means 15 may not be provided at all. When the thickness of the shape-retaining means 15 is thin, there is a risk that the function of protecting the main filter 14 will decline. When the thickness of the shape-retaining means 15 is thick, the ventilation resistance increases and there is a risk that the exhaust purification treatment amount per unit time will decline. On the other hand, when the thickness of the main filter 14 is thin, there is a risk that the dust in the dust-removing exhaust EH cannot be sufficiently removed. When the thickness of the main filter 14 is thick, the ventilation resistance increases and there is a risk that the exhaust purification treatment amount per unit time will decline. Incidentally, the thickness of the front-side shape-retaining means 15U and the thickness of the back-side shape-retaining means 15D may be the same, or they may be different.

[0096] The basic structure of the exhaust purification filter 7 shown in Fig. 10 is the same as that in Fig. 9, but the difference is that the main filter 14 is formed into a three-layer structure of an upper-layer main filter 14U, an intermediate-layer main filter 14M, and a lower-layer main filter 14D. When forming such a three-layer structure, it is preferable that the fiber diameter of the stainless steel fibers of the upper-layer main filter 14U is 6 to 10 μm, it is preferable that the fiber diameter of the stainless steel fibers of the intermediate-layer main filter 14M is 2 to 5 μm, and it is preferable that the fiber diameter of the stainless steel fibers of the lower-layer main filter 14D is 6 to 10 μm.

[0097] When the main filter 14 has such a layer structure, the metal fibers of the intermediate layer main filter 14M with a small fiber diameter can remove dust and the like most effectively. However, due to the small fiber diameter, there is a drawback that the strength is weak. Therefore, by providing the upper layer main filter 14U and the lower layer main filter 14D made of metal fibers having a larger fiber diameter than the metal fibers of the intermediate layer main filter 14M, the weakness of the fibers of the intermediate layer main filter 14M can be compensated for by the strength of the fibers of the upper layer main filter 14U and the lower layer main filter 14D. As a result, compared with the case where the main filter 14 is a single layer (assuming that the fiber diameter of the metal fibers constituting this single layer is the same as that of the metal fibers of the intermediate layer main filter 14M, which is 2 to 5 μm), the strength of the main filter 14 can be increased, the shape stability of the main filter 14 can be enhanced, and it becomes easier to withstand the pressure applied to the exhaust purification filter 7 during backwashing of the exhaust purification filter 7 (pressure by compressed gas). In particular, at the place where the pressure of the compressed gas is most applied to the back side of the main filter 14 during backwashing, by increasing the pressure resistance of the lower layer main filter 14D, damage to the main filter 14 caused by the compressed gas PA can be prevented.

[0098] Also, if the metal fiber diameter of the upper layer main filter 14U located outside the main filter 14 is large, compared with the case where the metal fiber diameter of the upper layer main filter 14U located outside the main filter 14 is small, during backwashing, dust and the like trapped in the voids of the upper layer main filter 14U located outside the main filter 14 can be more easily blown off to the outside of the main filter 14. Therefore, there is also an advantage that the cleaning effect during backwashing is enhanced.

[0099] Furthermore, by making the main filter 14 have a laminated structure, the variation in performance for each main filter 14 when manufacturing a plurality of main filters 14 can be reduced, and the performance of the main filter 14 can be stabilized.

[0100] In addition, although FIG. 10 shows an example in which the main filter 14 has a three-layer structure, it may have a structure of four or more layers. When the structure has four or more layers, from the viewpoint of protecting the layer of metal fibers with a small fiber diameter, it is preferable to reduce the fiber diameter of the stainless steel fibers as approaching the central portion in the thickness direction TD of the main filter 14.

[0101] Note that the porosity of the layer in the case where the main filter 14 is a single layer, and the porosity of each layer in the case where the main filter 14 is a multi-layer are preferably 65 to 80%. This porosity can be obtained from the following formulas 1 and 2.

[0102] [Formula 1] P (%) = Basis weight of the layer of the main filter (g / cm 2 ) / (Density of the metal fibers constituting the layer of the main filter (g / cm 3 ) × T (Thickness of the layer of the main filter (cm))) [Formula 2] Porosity (%) = 100 - P (%)

[0103] The density of the metal fibers in the above formula 1 is, for example, 7.98 (g / cm 3 ) when the metal fibers are stainless steel (SUS316L). Also, the "layer of the main filter" in formula 1 means the single layer when the main filter consists of a single layer. When the main filter consists of a plurality of layers and the porosity of each layer of the main filter is to be obtained, the basis weight, metal fibers, and thickness of each layer of the main filter may be used respectively. When the main filter consists of a plurality of layers and the porosity of the entire main filter in the laminated state is to be obtained, the basis weight, metal fibers, and thickness of the entire main filter may be used respectively.

[0104] Note that when manufacturing the main filter 14 consisting of a plurality of layers, it is preferable to uniformly laminate the metal fibers as raw materials and sinter (compress and fix) the laminated material.

[0105] Then, it is preferable to provide a cylindrical inner cylinder 8 inside the exhaust gas purification filter 7. As this inner cylinder 8, a punching sheet provided with a plurality of openings of a predetermined size formed into a cylindrical shape can be used. The cross-sectional shape of this inner cylinder 8 is not particularly limited either. For example, as shown in FIG. 6, it may be a perfect circle, an ellipse, a quadrilateral, a hexagon, or any other shape.

[0106] When the exhaust gas purification filter 7 is formed in a bellows shape as shown in FIG. 7, a peak portion 7X and a valley portion 7Y are formed. When the shape of the exhaust gas purification filter 7 is formed in a bellows shape and a cylindrical shape as shown in FIGS. 6 and 7, in the cross-sectional shape, a virtual line IL connecting a plurality of valley portions 7Y of the exhaust gas purification filter 7 becomes circular. It is preferable that the shape of the inner cylinder 8 is the same shape (circular) as this virtual line IL, and the back surface of a plurality of valley portions 7Y of the exhaust gas purification filter 7 is in contact with the surface of the inner cylinder 8. It is more preferable that the back surface of all valley portions 7Y of the exhaust gas purification filter 7 is in contact with the surface of the inner cylinder 8. By bringing a plurality of valley portions 7Y, 7Y and the inner cylinder 8 into contact in advance, it is possible to avoid the exhaust gas purification filter 7 and the inner cylinder 8 from colliding with each other every time the dust removal exhaust EH passes through the exhaust gas purification filter 7, so the life of the exhaust gas purification filter 7 can be extended.

[0107] As shown in FIGS. 4 and 5, the upper and lower ends of the exhaust gas purification filter 7 and the upper and lower ends of the inner cylinder 8 are each sealed, preventing the exhaust gas containing dust from entering the purification exhaust passage 13 by shortcutting without passing through the exhaust gas purification filter 7. The sealed portion of the exhaust gas purification filter 7 and the inner cylinder 8 is called a seal portion 9. In the embodiments of FIGS. 4 and 5, there is an upper seal portion 9A that seals the upper end of the exhaust gas purification filter 7 and the upper end of the inner cylinder 8, and a lower seal portion 9B that seals the lower end of the exhaust gas purification filter 7 and the lower end of the inner cylinder 8.

[0108] The dust removal exhaust EH is configured to flow from the outside to the inside of the cylindrical exhaust purification filter 7. In the process of the dust removal exhaust EH passing through the exhaust purification filter 7 from the outside to the inside, dust and the like in the dust removal exhaust EH are captured by the exhaust purification filter 7. The purified exhaust PEH purified by passing through the exhaust purification filter 7 passes through the opening of the inner cylinder 8 from the outside to the inside and reaches the purified exhaust passage 13. Then, in the embodiment of FIG. 4, the purified exhaust PEH moves upward from the lower side in the purified exhaust passage 13, passes through the hole portion of the annular ring of the upper seal portion 9A and the through hole provided in the mounting plate 10, and reaches the upper part of the exhaust purification device 3. Then, it is exhausted from the exhaust purification device 3 and sent to the residual dust removal device 4 through the purified exhaust vent pipe L3.

[0109] On the other hand, in the process of the dust removal exhaust EH passing through the exhaust purification filter 7 from the outside to the inside, foreign matters such as dust captured by the exhaust purification filter 7 accumulate on the outer surface of the exhaust purification filter 7. When the layer of foreign matters such as dust deposited on this outer surface becomes thick, the purification treatment efficiency of the dust removal exhaust EH deteriorates. Therefore, it is preferable to backwash the exhaust purification filter 7 at a predetermined timing.

[0110] For example, as shown in FIG. 5, compressed gas PA (for example, compressed air) is injected into the exhaust purification filter 7 from an injection nozzle 11 provided above the exhaust purification filter 7. The compressed gas PA injected from the injection nozzle 11 moves downward, enters the inside (purified exhaust passage 13) of the exhaust purification filter 7, and then flows in the direction opposite to that in FIG. 4. That is, after passing through the opening of the inner cylinder 8 from the inside to the outside, it passes through the exhaust purification filter 7 from the inside to the outside. By passing the compressed gas PA through the exhaust purification filter 7 in this way, the layer of foreign matters (foreign matter layer) such as dust deposited on the outer surface of the exhaust purification filter 7 is peeled off and falls and accumulates below the exhaust purification device 3. The deposit SD deposited below the exhaust purification device 3 is periodically discharged to the outside of the exhaust purification device 3.

[0111] Note that it is preferable that the axial direction of the injection nozzle 11 is the same as the axial direction of the exhaust gas purification filter 7. By making the axial direction of the injection nozzle 11 the same as the axial direction of the exhaust gas purification filter 7, the gas injected from the injection nozzle 11 can reach the inside of the exhaust gas purification filter 7 with little loss of its momentum, so there is an advantage that the cleaning effect of the exhaust gas purification filter 7 is high. The cleaning effect (the effect of removing dust adhering to the outer surface of the exhaust gas purification filter) is higher than when the axial direction of the injection nozzle 11 is perpendicular to the axial direction of the exhaust gas purification filter 7.

[0112] As described above, by backwashing the exhaust gas purification filter 7 at a predetermined timing, the pressure loss and the collection efficiency can be returned to the vicinity of the initial values. Therefore, it is no longer necessary to use the exhaust gas purification filter 7 as a disposable item, and it is possible to effectively utilize the earth's environmental resources and reduce the costs related to the replacement and disposal of the exhaust gas purification filter 7.

[0113] Note that during the purification process of the dust removal exhaust EH by the exhaust gas purification filter 7, it is also possible to perform backwashing while continuing the purification process without stopping the purification process. This is because the backwashing ends in a short time of several seconds, so there is no need to stop the purification process deliberately. In addition, since lumps of foreign substances such as dust peeled off from the exhaust gas purification filter 7 during backwashing have a certain weight, even if the dust removal exhaust EH is flowing toward the exhaust gas purification filter 7, the lumps of foreign substances such as dust peeled off from the exhaust gas purification filter 7 are less likely to reattach to the exhaust gas purification filter 7 under the influence of the flow of the dust removal exhaust EH. If it is desired to surely prevent lumps of foreign substances such as dust peeled off from the exhaust gas purification filter 7 from reattaching to the exhaust gas purification filter 7, the purification process of the dust removal exhaust EH may be temporarily stopped and then backwashing may be performed, and after the backwashing is completed, the purification process of the dust removal exhaust EH may be restarted. However, when such a process is performed, since it takes a certain amount of time to switch between the purification process and the cleaning (backwashing) process of the dust removal exhaust EH, there is a disadvantage that the purification amount of the dust removal exhaust EH is slightly reduced.

[0114] Further, as shown in the embodiments of FIGS. 11 and 12, a plurality of exhaust gas purification filters 7 are provided inside the exhaust gas purification device 3, and while one of the exhaust gas purification filters 7 is being backwashed, it is preferable that the other exhaust gas purification filter 7 filters the dust removal exhaust gas EH. For example, in the embodiments of FIGS. 11 and 12, a partition wall 29 that partitions the internal space 26 of the exhaust gas purification device 3 into a plurality of small spaces 27 is provided, and an exhaust gas purification filter 7 is provided in each small space.

[0115] Specifically, as shown in FIG. 11, the upper end of the partition wall 29 is fixed to the lower surface of the mounting plate 10 of the exhaust gas purification device 3, the partition wall 29 extends downward therefrom, and the lower end of the partition wall 29 is positioned near the lower end of the exhaust gas purification filter 7. In order to prevent the compressed gas PA during backwashing from directly colliding with the exhaust gas purification filter 7 disposed in the other small space 27, it is preferable that the lower end of the partition wall 29 is positioned near the lower end of the exhaust gas purification filter 7. Further, as shown in FIG. 12, this partition wall 29 is attached so as to partition between adjacent exhaust gas purification filters 7. As shown in FIG. 12, it is preferable that the partition wall 29 does not contact the inner wall of the container 28 of the exhaust gas purification device 3 and has a predetermined gap between the inner wall of the container 28 and the partition wall 29. Similarly, as shown in FIG. 11, the partition wall 29 does not extend further below the lower end of the exhaust gas purification filter 7, and it is preferable to provide a predetermined gap below the partition wall 29. This is to make it easier for the dust removal exhaust gas EH that has entered the container 28 of the exhaust gas purification device 7 to enter the respective small spaces 27A and 27B through the respective gaps during the exhaust gas purification process.

[0116] Due to the partition wall 29 attached in this way, the internal space 26 of the exhaust gas purification device 3 is approximately evenly divided into two, forming a first small space 27A and a second small space 27B. A first exhaust gas purification filter 7A is provided in the first small space 27A, and a second exhaust gas purification filter 7B is provided in the second small space 27B.

[0117] In this way, by partitioning the internal space 26 of the exhaust gas purification device 3 with the partition wall 29, it is possible to prevent the compressed gas PA jetted from the jetting section (nozzle 11) from directly colliding with the exhaust gas purification filter 7 disposed inside one small space 27 against the exhaust gas purification filter 7 disposed in the adjacent other small space 27. As a result, the influence of the compressed gas PA used when backwashing the exhaust gas purification filter 7 disposed in one small space 27 is less likely to reach the exhaust gas purification filter 7 disposed in the other small space 27. That is, while backwashing the exhaust gas purification filter 7 disposed in some of the small spaces 27, when purifying the dust removal exhaust EH using the exhaust gas purification filter 7 disposed in the other small spaces 27, the compressed gas PA is less likely to have an adverse effect on the exhaust gas purification filter 7 during the purification process. Therefore, even while some of the exhaust gas purification filters 7 are being washed, since the normal exhaust gas purification process can be performed by the other exhaust gas purification filters 7, there is an advantage that the efficiency of the exhaust gas purification process in the entire exhaust gas purification device 3 is less likely to decrease.

[0118] In the embodiments shown in FIGS. 11 and 12, while backwashing the second exhaust gas purification filter 7B disposed in the second small space 27B, the state in which the exhaust gas purification process is being performed by the first exhaust gas purification filter 7A disposed in the first small space 27A is shown. Of course, contrary to the illustrated example, the exhaust gas purification process may be performed by the second exhaust gas purification filter 7B while backwashing the first exhaust gas purification filter 7A.

[0119] In addition, FIGS. 10 and 11 show an example in which only one partition wall 29 is provided, but a plurality of partition walls 29 may be provided.

[0120] Note that when washing the exhaust gas purification filter 7 as described above, it has been found that washing the compressed gas PA against the inside of the exhaust gas purification filter 7 has a higher effect of removing dust and the like attached to the exhaust gas purification filter 7 than washing the compressed gas PA against the outside of the exhaust gas purification filter 7. Therefore, by so-called backwashing the exhaust gas purification filter 7 as described above, there is an advantage that the exhaust gas purification filter 7 does not need to be replaced for a longer period of time.

[0121] (Residual dust removal device 4) The residual dust removal device 4 has a residual dust removal filter for removing the dust remaining in the purified exhaust gas PEH. As the performance of this residual dust removal filter, it is preferable that it has a particle collection rate of 99.97% or more with respect to the dust having a particle size of 0.3 μm remaining in the purified exhaust gas PEH.

[0122] Specifically, as this residual dust removal filter, for example, a HEPA filter (an air filter having a particle collection rate of 99.97% or more with respect to particles having a particle size of 0.3 μm at the rated air volume and having a performance with an initial pressure loss of 245 Pa or less), a ULPA filter (an air filter having a particle collection rate of 99.9995% or more with respect to particles having a particle size of 0.15 μm at the rated air volume and having a performance with an initial pressure loss of 245 Pa or less), etc. can be used.

[0123] When using a residual dust removal filter that does not have a particle collection efficiency of 99.97% or more with respect to the dust having a particle size of 0.3 μm in the purified exhaust gas PEH, there is a problem that a large amount of dust may be mixed into the treated exhaust gas TEH discharged from the residual dust removal device 4.

[0124] In addition, by using a residual dust removal filter 25 having a particle collection rate of 99.97% or more with respect to the dust having a particle size of 0.3 μm remaining in the purified exhaust gas, there is an advantage that almost no dust can be seen in the treated exhaust gas after passing through the residual dust removal filter 25.

[0125] Furthermore, by providing an exhaust gas purification filter 7 in the front stage of the residual dust removal filter 25 and capturing most of the dust present in the dust removal exhaust gas EH by this exhaust gas purification filter 7, the replacement frequency of the residual dust removal filter 25 can be reduced. As a result, the cost related to the replacement and disposal of the residual dust removal filter 25 can be reduced.

[0126] (Cable recycling system related to a cable net generation plant) Fig. 13 shows an example of a cable recycling system 100 related to a cable net generation plant 99. The cable net generation plant 99 is a plant that generates nets Ng such as copper nets and miscellaneous nets from waste cables 33 and the like. The cable recycling system 100 is obtained by adding mechanisms for purifying exhaust gas, such as an exhaust gas purification device 3 and a residual dust removal device 4, to the cable net generation plant 99. Note that since the waste cable 33 is a non-radioactive waste, it is not always necessary to provide a mechanism for purifying exhaust gas, such as an exhaust gas purification device 3 and a residual dust removal device 4. However, from the viewpoints of preventing the diffusion of dust and the like, preventing the deterioration of the working environment, ensuring the safety of operators of each machine, etc., and suppressing the adhesion of fine powder and the like and maintaining the purity of the obtained net, it is preferable to provide exhaust equipment. Here, the exhaust equipment has a suction fan and a duct. It may have an exhaust hood.

[0127] Specifically, a copper net generation process and a miscellaneous net generation process are performed by the cable net generation plant 99. Specifically, in the copper net generation process, a power cable or a power supply cable with a cable diameter less than a predetermined value is input into the cable net generation plant 99 to obtain a copper net CuNg. Also, in the miscellaneous net generation process, a control cable or a data cable is input into the cable net generation plant 99 to obtain a miscellaneous net.

[0128] In the following description, the details of the cable recycling system 100 related to the cable net generation plant 99 shown in Fig. 13 will be described. Note that in Fig. 13, a state in which the copper net generation process is being carried out is shown, so the implementation state of this copper net generation process will be exemplified and described. Also, since the pre-duster 31, the exhaust gas purification device 3, the residual dust removal device 4, and the suction fan 5 are the same as those in Fig. 2, the descriptions of these will be omitted below.

[0129] (Crusher 50) First, power cables, power cables, control cables, data cables, etc. are fed as waste cables 33 into the feed port 50a of the crusher 50. The waste cables 33 fed into the crusher 50 are crushed into small pieces by the crushing section 50d of the crusher 50. The crushed materials consist of copper, coating, iron, etc.

[0130] The crushed material moves on the vibrating conveyor 50e inside the crusher 50 and is discharged from the discharge port 50b. Note that the above-described crusher 50 is merely an example, and the type of the crusher 50 is not particularly limited.

[0131] (Travel Path 52) The crushed material discharged from the discharge port 50b of the crusher 50 is transported to the crusher 54 by a moving path 52. The type of the moving path 52 is not particularly limited, but for example, a belt conveyor as shown in the figure can be used.

[0132] It is preferable to provide a magnetic separator 53 near the moving path 52. In FIG. 13, a suspended magnetic separator 53 is provided above the belt conveyor. By providing this magnetic separator 53, even if the crushed material moving on the belt conveyor contains small iron particles, the magnetic separator 53 can be attracted and removed by the magnets. That is, for example, if the power cable or power cable to be fed into the crusher 50 still has screws or the like attached, iron or the like derived from the screws will be mixed into the crushed material. However, by providing the magnetic separator 53, the iron or the like can be attracted and removed, so that the pre-processing of the power cable or power cable to be fed into the crusher 50 can be simplified. That is, pre-processing for removing screws or the like from each cable is no longer necessary, and each cable can be quickly fed into the crusher 50 in large quantities using a backhoe or the like.

[0133] (Crusher 54) The crushed material carried by the belt conveyor is supplied from a supply port 54a of the crusher 54 to the inside of the crusher 54, and after being crushed inside the crusher 54, is discharged from a discharge port 54b. The type of the crusher 54 is not particularly limited.

[0134] (Miniaturization device 77) Note that the device for reducing the size of the waste cable 33 is called the miniaturization device 77. The type of this miniaturization device 77 is not particularly limited, but a miniaturization device having a crusher 50, a pulverizer 54, and a transfer path 52 as described above can be exemplified. A miniaturization device having only a crusher 50 and a pulverizer 54 without a transfer path 52 may also be used. Thus, the miniaturization device 77 may be any device that can reduce the waste cable 33 to a size about the size of a nugget, and the structure of the machine and the like are not particularly limited.

[0135] (Classifier 56) The pulverized material discharged from the pulverizer 54 is supplied to the classifier 56 by the compressed air of the blower 55 adjacent to the pulverizer 54. The pulverized material supplied to the classifier 56 is classified into solids and gases inside the classifier 56. That is, the light dust in the pulverized material is discharged from above the classifier 56 together with the compressed gas sent from the blower 55. On the other hand, the relatively heavy solids in the pulverized material, that is, the copper material Cu and the coating material Ct are discharged from below the classifier 56.

[0136] Note that the type of the classifier 56 is not particularly limited, and for example, a cyclone or the like can be used.

[0137] (Separator 57) The copper material Cu and the coating material Ct discharged from the classifier 56 are supplied to the separator 57 and separated into the copper material Cu and the coating material Ct by this separator 57. The type of the separator 57 is not particularly limited, and for example, a wet specific gravity separator, a dry specific gravity separator, or the like can be used. In particular, it is preferable to use a wet specific gravity separator that has the advantage of not generating dust in the air.

[0138] In the embodiment shown in Fig. 13, a wet specific gravity separator is used as the separator 57. The illustrated wet specific gravity separator has an inclined portion where the left side of the drawing is low and the right side of the drawing is high. Liquid LQ (water can be cited as a representative example of this liquid. In the following description, the case of supplying water as the liquid will be described as an example) is supplied to the inclined portion of this wet specific gravity separator from the right side of the drawing, and a water flow is formed by the supplied water inside the wet specific gravity separator. The inclined bed surface of the wet specific gravity separator repeats vibrations upward in the inclined direction. The coating material (light specific gravity) is flowed downstream by the water flow, and copper (heavy specific gravity) is separated by specific gravity by rising upstream due to friction with the inclined bed surface. The copper material Cu with a heavy specific gravity moves upward to the upper right side of the drawing and then falls by gravity and is supplied to the dehydrator 58. On the other hand, the coating material Ct with a light specific gravity moves downward to the lower left side of the drawing together with water and is supplied to the coating material moving path 65.

[0139] In addition, in the embodiment shown in Fig. 15, a dry specific gravity separator is used as the separator 57. The copper material Cu and the coating material Ct supplied to the inlet of the dry specific gravity separator move on a vibrating deck provided with many through holes (air flows from below to above the through holes). In the process, using vibration and the buoyancy of air, they are separated by the specific gravity difference between the copper material Cu and the coating material Ct. The heavy particles (copper material Cu) are discharged from the right side of the drawing, and the light particles (coating material Ct) are discharged from the left side of the drawing.

[0140] When using a dry specific gravity separator, in the process of the copper material Cu and the coating material Ct rolling on the deck, there is a possibility that the dust adhering to the copper material Cu and the coating material Ct may be peeled off and scattered by vibration and air. Therefore, it is preferable to provide an exhaust hood 64 above the dry specific gravity separator to suck the dust and prevent diffusion.

[0141] As shown in Fig. 15, when using a dry specific gravity separator, the installation of the dehydrator 58, the dryer 59, the elevator 60, the coating material moving path 65, the slag removal device 69, the storage tank 67, and the draining device 68 can be omitted.

[0142] (Dehydrator 58, Dryer 59) Since water derived from the wet specific gravity separator adheres to the copper material Cu supplied to the dehydrator 58, it is dehydrated by the dehydrator 58. Thereafter, the dehydrated material is supplied to the dryer 59 and dried by the dryer 59. The types of this dehydrator 58 and dryer 59 are not particularly limited.

[0143] (Lift 60, magnetic separator 61, sieve machine 62) The dried material discharged from the dryer 59 is moved upward from below by the lift 60 and supplied to the magnetic separator 61. Impurities other than copper and brass are removed from the dried material by this magnetic separator 61. Thereafter, it is supplied to the separation device 62 (for example, a vibrating sieve) and sieved to be separated into copper nuggets CuNg and brass C36.

[0144] Note that the brass C36 is used for the power outlet of a socket which is an accessory of the waste cable 33. When the waste cable 33 with a socket attached is put into the crusher 50, it is separated by this separation device 62. When the waste cable 33 put into the crusher 50 does not have a power outlet of a socket attached, the installation of this separation device 62 can be omitted.

[0145] Note that the type of the magnetic separator 61 is not particularly limited. For example, a magnetic separator such as a drum type can be used. Also, the type of the separation device 62 is not particularly limited. For example, a separation device such as a vibrating sieve can be used.

[0146] (Coating material moving path 65, slag removal device 69, storage tank 67, draining device 68) The coating material supplied to the coating material moving path 65 moves from the right side to the left side of the drawing by the coating material moving path 65. The type of this coating material moving path 65 is not particularly limited. For example, a coating material moving path such as a screw conveyor can be used.

[0147] The covering material moved by the covering material moving path 65 is supplied to the draining device 68, and the water derived from the wet specific gravity separator adhering to the covering material is removed. The type of this draining device 68 is not particularly limited. For example, a draining device such as a flexible container can be used.

[0148] Note that it is preferable to provide a slag removal device 69 and a storage tank 67 below the covering material moving path 65. The storage tank 67 is a tank that receives and stores the water that falls downward while moving the covering material by the covering material moving path 65. The slag removal device 69 installed between the covering material moving path 65 and the storage tank 67 is for removing the slag contained in the water falling from the covering material moving path 65. The type of this slag removal device 69 is not particularly limited.

[0149] (Purification of Exhaust Gas) In the cable recycling system 100 as described above, dust is generated during the process of operating the cable recycling system, and there is a risk that the dust scatters and contaminates the surrounding environment. In addition, there is a risk that the purity of the target copper may be reduced due to the adhered dust.

[0150] Therefore, it is preferable to provide an exhaust hood or the like at a place where dust is likely to scatter to prevent the diffusion of the dust. The cable recycling system 100 shown in FIG. 13 is provided with an exhaust box 51 around the inlet 50a of the crusher 50 (the front side and the right side in the drawing in FIG. 13). When the dust adheres to the waste cable 33, there is a possibility that the dust scatters when the waste cable 33 is inserted into the inlet 50a. Therefore, the air near the inlet 50a may be sucked from the suction port 51a of the exhaust box 51 and guided to the pre-duster 31. In addition, when the dust adheres to the crushed material discharged from the crusher 50, in the process where the crushed material is placed on the vibrating conveyor 50e in the crusher 50 and moves toward the discharge port 50b, the dust separates from the crushed material and scatters inside the crusher 50, and there is a possibility that the scattered dust leaks out of the crusher 50 from the discharge port 50b. Therefore, a small exhaust hood 50c may also be provided at the discharge port 50b of the crusher 50, and the air near the discharge port 50b may also be sucked and guided to the pre-duster 31.

[0151] Furthermore, if dust adheres to the crushed material, when the crushed material is placed on the belt conveyor which is the transfer path 52 and moves, the dust may scatter. Therefore, an exhaust hood 63 may be provided above the transfer path 52 to suck the air near the transfer path 52 and guide it to the dust removal device 4. Note that the exhaust from the exhaust hood 63 may be guided to the dust removal device 4 instead of the pre-duster 31. That is, on the belt conveyor, the crushed material is in a stationary state, and it can be expected that the amount of the dust scattered from the stationary crushed material is small, and it can also be expected that the amount of the dust scattered from the stationary crushed material is small. Therefore, even if the exhaust is guided to the dust removal device 4, the high-performance filter of the dust removal device 4 is less likely to be clogged.

[0152] Also, the crushed material moved by the transfer path 52 is put into the crusher 54. If dust adheres to this crushed material, the dust may scatter when the crushed material is put from the transfer path 52 into the crusher 54. Therefore, a small exhaust hood 54c may also be provided at the supply port 54a of the crusher 54 to suck the air near the supply port 54a of the crusher 54 and guide it to the pre-duster 31.

[0153] Also, when the copper material Cu and the coating material Ct discharged from the cyclone are supplied to the sorter 57, if dust generated by pulverization and crushing adheres to the copper material Cu and the coating material Ct, there is a risk that the dust will scatter and contaminate the surrounding environment. Also, there is a risk that the purity of the nugget copper will decrease. Therefore, a branch may be provided in the pipe for supplying the sorter 57 to exhaust, and the exhaust may be guided to the pre-duster 31.

[0154] Furthermore, if dust adheres to the copper material Cu sorted by the sorter 57, there is a risk that the dust will spread in the dehydrator 58 or the dryer 59 after the sorter 57 and contaminate the surrounding environment. Therefore, an exhaust hood 64 may be provided for the dehydrator 58 and the dryer 59 to guide the contaminated air generated in the dehydrator 58 and the dryer 59 to the dust removal device 4.

[0155] Note that since the dehydrator 58 and the dryer 59 are machines arranged in the latter stage in the cable recycling system 100, even if dust adheres to the copper material Cu supplied to the dehydrator 58 and the dryer 59, the amount is expected to be small. For the same reason, even if dust is mixed in the copper material Cu, the amount is expected to be small. Therefore, the exhaust from the exhaust hood 64 may be led to the dust removal device 4 instead of the pre-duster 31. That is, even if the exhaust from the exhaust hood 64 is led to the dust removal device 4, it is considered that the high-performance filter of the dust removal device 4 is less likely to be clogged.

[0156] As described above, it is preferable to provide exhaust hoods for the crusher 50, the pulverizer 54, the transfer path 52, the separator 57, the dehydrator 58, and the dryer 59, and to lead the air containing the dust generated from these devices and the like to the exhaust purification device 3 and the residual dust removal device 4.

[0157] Note that when purifying the exhaust generated from the devices of the crusher 50, the pulverizer 54, the transfer path 52, the separator 57, the dehydrator 58, and the dryer 59, providing the exhaust hoods for these devices has the advantage of making it easier to exhaust the dust and dust generated from these devices evenly. However, if it is not necessary to exhaust evenly, the installation of the exhaust hood may be omitted.

[0158] Also, in the form of FIG. 13, the exhaust generated from the devices of the transfer path 52, the dehydrator 58, and the dryer 59 is directly led to the residual dust removal device 4, but it is not limited to such a form. That is, the exhaust generated from the devices of the transfer path 52, the dehydrator 58, and the dryer 59 may be supplied to the pre-duster 31.

[0159] Note that since the target waste cable is a waste cable that is a non-radioactive waste, the pre-duster 31, the exhaust purification device 3, and the residual dust removal device 4 can be omitted, and only the exhaust equipment can be used.

[0160] (Treatment of the liquid of the wet specific gravity separator) As described above, when using a wet specific gravity separator as the sorter 57 of the cable recycling system 100, a liquid (for example, water) for sorting is required. It is preferable to configure the system to circulate and use this liquid in order to effectively utilize the liquid. Hereinafter, with reference to FIG. 14, a liquid purification treatment system 80 for circulating and using the liquid will be described.

[0161] (Storage tank 67) As described with reference to FIG. 13, when using a wet specific gravity separator as the sorter 57, a liquid (for example, water) is used. It is preferable to temporarily store the water used in this wet specific gravity separator in the storage tank 67 and then transport it back to the wet specific gravity separator for reuse.

[0162] (Blow liquid storage tank 70) Dust, powder, etc. adhering to the copper material Cu and the coating material Ct are suspended in the water stored in the storage tank 67 and gradually become dirty. If this dirty water is recycled back to the wet specific gravity separator without any treatment, there is a risk that the copper material Cu and the coating material Ct fed into the wet specific gravity separator will be contaminated by the recycled water.

[0163] Therefore, it is preferable to transfer the blow water (also referred to as supernatant water. Blow water is an example of blow liquid) of the water stored in the storage tank 67 to the blow liquid storage tank 70 and temporarily store it in the blow liquid storage tank 70.

[0164] (Contaminated liquid storage tank 71) The blow water stored in the blow liquid storage tank 70 is transferred to the contaminated liquid storage tank 71 by the pump P2 and temporarily stored in the contaminated liquid storage tank 71.

[0165] (Purification device 72) The contaminated water (contaminated water is an example of contaminated liquid) stored in the contaminated liquid storage tank 71 is preferably supplied to the purification device 72 and sprayed from the contaminated liquid spraying section 72a of the purification device 72. Further, it is preferable to provide a freezing coil 72b inside the purification device 72. At this time, the contaminated liquid spraying section 72a is preferably disposed above the freezing coil 72b.

[0166] The type of the contaminant liquid spraying unit 72a is not particularly limited, and examples thereof include a sprinkler nozzle. Also, the type of the freezing coil 72b is not particularly limited.

[0167] The contaminated water sprayed from the contaminant liquid spraying unit 72a falls and contacts the outer surface of the freezing coil 72b, and is cooled in the process of flowing down along the outer surface of the freezing coil 72b. Note that a coolant or a refrigerant gas is supplied from the chiller unit 75 to the inside of the freezing coil 72b, and the freezing coil 72b is cooled.

[0168] In the process of the contaminated water flowing down along the outer surface of the freezing coil 72b, the portion of the contaminated water that does not contain dust (water that does not contain any dust, or water that contains only a very small amount of dust to the extent that it can be regarded as not containing any dust) adheres to the outer surface of the freezing coil 72b as ice. The remaining portion that does not adhere as ice (for example, water containing a large amount of dust) falls to the bottom of the purification device 72, is discharged as an impurity liquid from the impurity liquid discharge port 72c, and is returned to the contaminant liquid storage tank 71. Note that while supplying the contaminant liquid, the valve B1 is opened and the valve B2 is closed.

[0169] By thus returning the impurity liquid to the contaminant liquid storage tank 71, the degree of contamination of the contaminated water inside the contaminant liquid storage tank 71 gradually becomes higher. Therefore, it is preferable to drive the pump P3 at a predetermined timing to transfer the concentrated contaminated water in the contaminant liquid storage tank 71 to the concentrated contaminant liquid storage tank 73. The concentrated contaminated water temporarily stored in the concentrated contaminant liquid storage tank 73 (the concentrated contaminated water is an example of the concentrated contaminant liquid) contains a lot of dust and powder, and thus it is preferable to dehydrate and dry it at a predetermined timing and perform landfill disposal or the like.

[0170] On the other hand, by continuously spraying the contaminated water from the contaminant liquid spraying unit 72a as described above, the ice generated on the surface of the freezing coil 72b grows. When this ice has grown sufficiently, the operation of the pump P4 is stopped and the supply of the contaminated water is stopped. At the same time, the operation of the chiller unit 75 is stopped to stop the cooling of the freezing coil 72b. Also, the valve B1 is closed and the valve B2 is opened.

[0171] Thereafter, the warm water in the thawing liquid storage tank 74 is supplied to the dissolution promoting liquid spraying section 72e by the pump P5, and the warm water is sprayed from the dissolution promoting liquid spraying section 72e. The warm water is a liquid for dissolving the frozen matter formed on the outer surface of the freezing coil 72b and is an example of the dissolution promoting liquid.

[0172] Also, the warm water in the thawing liquid storage tank 74 is generated by heating the water in the thawing liquid storage tank 74 with the heater 76. The temperature of the warm water is not particularly limited and can be arbitrarily determined, but it is set to an optimal temperature based on the heater capacity and the thawing time.

[0173] In FIG. 14, in order to effectively utilize water resources, the warm water sprayed from the dissolution promoting liquid spraying section 72e is carried from the thawing liquid storage tank 74. Separately from this, warm water may be supplied from the outside.

[0174] As described above, the warm water sprayed from the dissolution promoting liquid spraying section 72e falls and contacts the ice formed on the outer surface of the freezing coil 72b, and melts the ice in the process of flowing down along the ice and the freezing coil 72b. The water containing no dust generated by the melting of the ice is discharged from the non-impure liquid discharge port 72d of the purification device 72 and transferred into the thawing liquid storage tank 74.

[0175] The water containing no dust transferred to the thawing liquid storage tank 74 is returned to the storage tank 67 and then sent to the wet specific gravity separator again by the pump P1 for reuse.

[0176] (Others) Note that as the operation of the wet specific gravity separator and the liquid purification treatment system 80 continues, the amount of the liquid used in the wet specific gravity separator (the liquid to be recycled) gradually decreases because the concentrated waste liquid is discarded or volatilized. Therefore, in the liquid purification treatment system 80, it is preferable to sequentially supplement the liquid from the outside. The liquid to be supplemented (referred to as the supplementary liquid) is not particularly limited, and examples thereof include city water and tap water.

[0177] In addition, a path for circulating the used liquid used in the wet specific gravity separator and supplying it again to the wet specific gravity separator is called a liquid circulation path. The liquid circulation path in the example of Fig. 14 refers to a path that circulates in the order of the separator 57 (wet specific gravity separator), the storage tank 67, the blow liquid storage tank 70, the contaminated liquid storage tank 71, the purification device 72, the dissolution promoting liquid storage tank 74, the storage tank 67, and the separator 57 (wet specific gravity separator). In Fig. 14, such a series of liquid circulation paths are labeled with the symbol LR.

[0178] 1: Cable recycling system related to a covering material peeling machine, 2: Working area, 3: Exhaust gas purification device, 4: Residual dust removal device, 5: Suction fan, 6: Exhaust hood, 7: Exhaust gas purification filter, 7A: First exhaust gas purification filter, 7B: Second exhaust gas purification filter, 7X: Crest portion, 7Y: Trough portion, 8: Inner cylinder, 9: Seal portion, 9A: Upper seal portion, 9B: Lower seal portion, 10: Mounting plate, 11: Injection nozzle, 12: Compressed gas supply pipe, 13: Purified exhaust passage, 14: Main filter, 14U: Upper layer main filter, 14M: Intermediate layer main filter, 14D: Lower layer main filter, 15: Shape holding means, 15U: Front side shape holding means (upper side shape holding means), 15D: Back side shape holding means (lower side shape holding means), 16: Exhaust supply port, 17: Metal fiber, 18: Purified air discharge port, 24: Deposit discharge port, 25: Residual dust removal filter, 26: Internal space, 27: Small space, 27A: First small space, 27B: Second small space, 28: Container of the exhaust gas purification device, 29: Partition wall, 30: Covering material peeling machine, 31: Preduster, 32: Operator, 33: Waste cable, 34: Pica copper wire, 35: Insulator, 36: Sheath, 37: Covering material, 50: Crusher, 50a: Inlet (of the crusher), 50b: Outlet (of the crusher), 51: Exhaust box, 52: Transfer path, 53: Magnetic separator, 54: Pulverizer, 54a: Inlet (of the pulverizer), 54b: Outlet (of the pulverizer), 55: Blower, 56: Classifier, 57: Sorter, 58: Dehydrator, 59: Dryer, 60: Elevator, 61: Magnetic separator, 62: Sieve machine, 63: Exhaust hood (of the transfer path), 64: Exhaust hood (of the dehydrator or dryer), 65: Covering material transfer path, 66: Exhaust hood (of the dry specific gravity separator), 67: Storage tank, 68: Drainage device, 69: Slag removal device, 70: Blow liquid storage tank, 71: Contaminated liquid storage tank, 72: Purification device, 72a: Contaminated liquid spraying portion, 72b: Freezing coil, 72c: Non-pure liquid discharge port, 72d: Non-impure liquid discharge port, 72e: Dissolution promoting liquid spraying portion, 73: Concentrated contaminated liquid storage tank, 74: Dissolution promoting liquid storage tank, 75: Chiller unit, 77: Miniaturization device, 80: Liquid purification treatment system, 99: Cable naget generation plant, 100: Cable recycling system (related to the cable naget generation plant), IL: Virtual line, AH: Exhaust, EH: Dust removal exhaust, PEH: Purified exhaust, TEH: Treatment exhaust, PA: Compressed gas, SD: Deposit, US: Front side (upper side), DS: Back side (lower side), TD: Thickness direction,LR: Liquid circulation path, P1: (First) pump, P2: (Second) pump, P3: (Third) pump, P4: (Fourth) pump, P5: (Fifth) pump, P6: (Sixth) pump, B1: (First) valve, B2: (Second) valve, Cu: Copper material, Ct: Coating material, Ng: Naget, CuNg: Copper naget, C36: Brass, LQ: Liquid

Claims

1. A cable recycling method for recycling waste cables of nuclear power facilities, comprising: a cable diameter classification step of classifying at least one of a power cable and a power supply cable among the waste cables that are non-radioactive waste according to the size of the diameter; a pickled copper wire extraction step of peeling a coating material from the cable having a diameter equal to or greater than a predetermined size among the cables classified in the cable diameter classification step to obtain pickled copper wire; a copper ingot generation step of pulverizing the cable having a diameter less than a predetermined size among the cables classified in the cable diameter classification step, and separating the pulverized material into a coating material and a copper ingot to obtain a copper ingot; A cable recycling method characterized by the above.

2. A cable recycling method for recycling waste cables of nuclear power facilities, comprising: a miscellaneous ingot generation step of pulverizing at least one of a control cable and a data cable among the waste cables that are non-radioactive waste, and separating the pulverized material into a coating material and miscellaneous ingots to obtain miscellaneous ingots; A cable recycling method characterized by the above.

3. A cable recycling system for recycling waste cables of nuclear power facilities, wherein: the cable recycling system has a coating material peeling machine for peeling a coating material from the waste cable; the waste cable supplied to the coating material peeling machine is at least one cable selected from a power cable having a diameter equal to or greater than a predetermined size and a power supply cable having a diameter equal to or greater than a predetermined size, and is a waste cable that is non-radioactive waste; A cable recycling system characterized by the above.

4. A cable recycling system for recycling waste cables of nuclear power facilities, wherein: the cable recycling system has a miniaturization device for miniaturizing the waste cable; a wet specific gravity separator for separating the miniaturized object miniaturized by the miniaturization device into a coating material and an ingot using a liquid; a dehydrator for dehydrating the separated ingot; a dryer for drying the dehydrated ingot; has an exhaust facility for dust discharged from at least one of the miniaturization device and the wet specific gravity separator; the waste cable supplied to the miniaturization device is at least one cable selected from the group consisting of a power cable having a diameter less than a predetermined size, a power supply cable having a diameter less than a predetermined size, a control cable, and a data cable; A cable recycling system characterized by being a waste cable that is non-radioactive waste. A cable recycling system characterized by the above. **Claim 5** A cable recycling system for recycling waste cables of nuclear power facilities, wherein the cable recycling system comprises a miniaturization device for miniaturizing the waste cable, a dry specific gravity separator for separating the miniaturized object miniaturized by the miniaturization device into a coating material and a slug, has an exhaust facility for dust discharged from at least one of the miniaturization device and the dry specific gravity separator, wherein the waste cable supplied to the miniaturization device is at least one cable selected from the group consisting of a power cable having a diameter less than a predetermined size, a power supply cable having a diameter less than a predetermined size, a control cable, and a data cable, and is a waste cable that is non-radioactive waste. A cable recycling system characterized by the above. **Claim 6** A cable recycling system for recycling waste cables of nuclear power facilities, wherein the cable recycling system comprises a crusher to which the waste cable is supplied and which crushes the supplied waste cable, a grinder for grinding the crushed material crushed by the crusher, a moving path for the crushed material connecting between the crusher and the grinder, a wet specific gravity separator for separating the ground material ground by the grinder into a coating material and a slug using a liquid, a dehydrator for dehydrating the separated slug, a dryer for drying the dehydrated slug, has an exhaust facility for dust discharged from at least one selected from the group consisting of the crusher, the grinder, and the wet specific gravity separator, wherein the waste cable supplied to the crusher is at least one cable selected from the group consisting of a power cable having a diameter less than a predetermined size, a power supply cable having a diameter less than a predetermined size, a control cable, and a data cable, and is a waste cable that is non-radioactive waste. A cable recycling system characterized by the above. **Claim 7** An exhaust gas purification device provided with a metal exhaust gas purification filter for removing the dust, and a residual dust removal device provided at a subsequent stage of the exhaust gas purification device for removing the dust remaining in the purified exhaust gas discharged from the exhaust gas purification device. The residual dust removal device has a residual dust removal filter having a particle collection rate of 99.97% or more with respect to dust having a particle size of 0.3 μm remaining in the purified exhaust gas. The cable recycling system according to any one of claims 4 to 6.

8. In the wet specific gravity separator, a liquid circulation path is connected to circulate the liquid used in the wet specific gravity separator and supply it again to the wet specific gravity separator, In the liquid circulation path, a purification device for purifying the used liquid passing through the liquid circulation path is attached, The purification device includes a contaminated liquid spraying unit that sprays a contaminated liquid, which is the used liquid passing through the liquid circulation path, a freezing coil that freezes a portion of the contaminated liquid sprayed from the liquid spraying unit and does not contain dust and attaches it to the outer surface, an impurity liquid discharge port that discharges the remaining portion of the contaminated liquid sprayed from the liquid spraying unit and contains dust, a dissolution promoting liquid spraying unit that sprays a dissolution promoting liquid for dissolving the frozen material formed on the outer surface of the freezing coil after stopping the spraying of the liquid from the liquid spraying unit, and a non-impurity liquid discharge port that discharges the liquid not containing dust dissolved by the dissolution promoting liquid sprayed from the dissolution promoting liquid spraying unit, The cable recycling system according to claim 4 or 6, wherein the liquid not containing dust discharged from the non-impurity liquid discharge port is used in the wet specific gravity separator.

Images