JPH08155329A - Mixture sorting device - Google Patents

Abstract

PURPOSE: To effectively and accurately sort a mixture and further to easily increase sorting capacity. CONSTITUTION: A liquid medium is stored in a waterway 1a and is circulated in the waterway 1a by a circulating device 3. A mixture thrown in from a hopper 5 is passed through a submerged waterway 7 and delivered to a sorting part 10. In the sorting part 10, the mixture surfaces and settles by the difference in specific density between it and a liquid medium. The surfaced material is conveyed by a conveying device 13, and after the settled material is further sorted by specific density by a circulated flow and a vortex C, it is conveyed out by a conveying devices 11, 12. Plural small waterways other than the small waterway 1a are installed perpendicular to the plane of the figure, and the flow rate of the circulated flow is changed every small waterway. In this way, sorting is effectively and accurately performed, and sorting capacity is easily increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixture sorting apparatus,
In particular, the present invention relates to a mixture sorting device that sorts objects to be sorted by specific gravity when the objects to be sorted having different specific gravities are mixed in various ways.

[0002]

2. Description of the Related Art Among general wastes or industrial wastes discharged in a large amount, the amount of plastic wastes is increasing, and it is presently difficult to deal with them. In the treatment of waste plastic, incinerating it will generate toxic gas and cause pollution problems, and if it is disposed of in landfill, it will cause instability such as ground subsidence after landfilling due to its large volume ratio. , And requires vast land.

[0003] In particular, regarding the treatment of industrial waste that is becoming larger, unless the waste plastic is separated and removed, high temperature combustion is required during incineration, and the durability of the incinerator becomes a problem. In addition, in the case of landfill disposal, there are also problems such as soaring landfill disposal costs, transportation costs and other processing costs.

Therefore, as a method of separating such waste plastics without landfill disposal, the electrostatic separation method described in JP-A-52-86452 or JP-A-50-142681 is disclosed. The liquid cyclone method described in 1) is known.

In the above-mentioned prior art, the electrostatic fractionation method involves passing an aggregate of plastic films made of various materials between electrode plates to which a high DC voltage is applied within a period in which static electricity generated in the plastic films is not extinguished. Then, depending on the sign of the static electricity (positive, negative) or the amount of charge,
By utilizing the fact that this film is attracted and repelled by the positive electrode plate or the negative electrode plate, the plastic film is sorted by type. That is, it is a method of passing waste plastic through a high-voltage electric field and separating it by utilizing the difference between the attraction force and the repulsion force by electrostatic induction.

However, the electrostatic separation method has a problem in that the separation efficiency varies depending on the size (mass) of the waste plastic crushed pieces, and high voltage generation equipment, raw material drying equipment, fine pulverization equipment, etc. are required. However, there was a drawback that the equipment cost was high.

In the liquid cyclone method, a liquid and waste plastic crushed pieces are fed tangentially to the container wall from the upper part of the separation container, and a descending swirl flow of the liquid along the container wall surface and an ascending swirl flow to the center part. Among the crushed plastic pieces, those with a large difference in specific gravity with the liquid are placed in the descending swirl flow and settled to be discharged from the lower part of the container, and those with a small difference in specific gravity with the liquid are sucked into the ascending swirl flow and raised. The waste plastic is sorted by overflowing it from the upper part of the container. That is, the waste plastic crushed pieces are separated by the difference in specific gravity using a swirling flow of liquid, and there is no drawback that the equipment cost is high unlike the electrostatic separation method.

Further, Japanese Patent Application Laid-Open No. 56-56246 and Japanese Patent Application No. 4-338360 filed by the same applicant as this application describe
When plastics are selected by using the difference in specific gravity from liquid, the floating plastics can be further separated into two types,
A method of further separating the precipitated plastic into two types has been proposed.

[0009]

However, in the above-mentioned liquid cyclone method of the prior art, the power consumption of the liquid circulation pump for feeding the liquid medium and the waste plastic crushed pieces into the separation container becomes large, and the waste plastic crushed pieces are crushed. There is a problem that the efficiency of separation depends on the size (mass).

Further, in any of the above-mentioned prior arts,
Even if we try to improve the sorting ability, there is a problem that we cannot do so. As mentioned above, the amount of waste plastics is increasing, and it is very important to improve the sorting capacity according to the increase, and there is a strong demand to improve the sorting capacity. is there.

An object of the present invention is to provide a mixture selection device which has good selection efficiency when selecting a mixture of waste plastic crushed pieces, consumes less power of the device, and has an extremely easy increase of the selection capacity. It is in.

[0012]

In order to achieve the above object, the present invention provides a liquid medium tank in which a liquid medium is stored, and a circulating flow generating means for generating a circulating flow in the liquid medium in the liquid medium tank. And an object to be sorted, in which objects having different specific gravities are mixed, is introduced into the liquid medium tank from the upstream side of the circulation flow, and a circulation flow provided in the liquid medium tank and introduced by the introduction means. And a carrying-out means for carrying out the objects to be sorted which have been sorted by the sorting means to the outside. In the mixture sorting apparatus described above, a plurality of small water channels are provided in the liquid medium tank, the circulating flow generating means, the charging means and the sorting means are installed for each of the small water channels, and the carry-out means is provided for each of the small water channels. A common structure for all waterways A.

Further, according to the present invention, a liquid medium tank in which a liquid medium is stored, a circulation flow generating means for generating a circulation flow in the liquid medium in the liquid medium tank, and objects to be sorted having different specific gravities are mixed. A means for charging the material into the liquid medium tank from the upstream side of the circulation flow, and an agitator for removing the bubbles adhering to the material to be sorted by stirring the charged material to be sorted in the liquid medium. Foaming means and the object to be sorted provided in the liquid medium tank, which has been defoamed by the defoaming means and has flowed along the circulation flow, the object to be sorted having a smaller specific gravity than the liquid medium is floated, A large sorting target is settled and sorted, and a sorting unit that sorts the settled sorted target by specific gravity using a circulation flow, and a unloading unit that carries out the sorted target sorted by the sorting unit to the outside. In the liquid medium tank, A plurality of small water channels are provided, and the circulation flow generating means, charging means, defoaming means and sorting means are installed for each of the small water channels, and the carry-out means is shared by all of the small water channels. It was done.

Further, in the mixture selecting apparatus having the above-mentioned constitution, it is possible to add a circulating flow velocity adjusting means for adjusting the circulating flow velocity for each of the small water channels. The charging means is configured to classify the objects to be sorted by size and then to charge the small water channels according to size, and the sorting means generates a vortex in a part of the circulation flow in the liquid medium tank. By doing so, the sedimented objects to be sorted are further sorted by specific gravity. Further, the mixture sorting device can be installed in a waste treatment device for sorting metal or plastic.

[0015]

The operation of the mixture selecting apparatus having the above construction will be described by taking the case where the object to be selected is plastic waste as an example.
The specific gravity of the majority of plastic waste discharged in large quantities is 0.90 to 0.98 for polyethylene, 0.90 to 0.96 for polypropylene, and 1.02 to 1.1 for polystyrene.
5, ABS resin 1.03 to 1.09, phenol resin 1.25 to 1.30, polyvinyl chloride 1.33 to 1.45
Since these specific gravities are close to the specific gravity of water, water is used as a liquid medium for specific gravity selection.

According to the mixture sorting apparatus having the above-mentioned structure, the plastic waste put into the divided small water channels from the feeding means is sent to the place where the sorting means is provided on the circulating flow of each small water channel. To be Where a sorting means is provided, polyethylene and polypropylene, which have a lower specific gravity than water, float to the surface of the water, and polystyrene and A, which have a higher specific gravity than water,
By allowing the BS resin, the phenol resin, and the polyvinyl chloride to settle at the bottom of the liquid medium tank, it is possible to sort the plastics by specific gravity for each small water channel. Then, the plastics selected for each small waterway are carried out to the outside by a common carrying-out means by specific gravity.

When the defoaming means is provided, it is possible to remove the bubbles adhering to the surface of the plastic waste that has been thrown in from the throwing means. That is, when the plastic waste is put into water, air bubbles adhere to the surface of the plastic waste and the apparent specific gravity of the plastic becomes small and the sorting becomes inaccurate, but defoaming means is provided for each small waterway. In this case, it is possible to easily remove the air bubbles adhering to the surface of the plastic waste and then send the plastic waste to the place where the sorting means is provided.

If the sorting means is provided with a function of sorting the settled substances to be sorted according to specific gravity, the settled substances to be sorted can be further finely sorted. Among the plastics that sink at the bottom of the liquid medium tank, polystyrene,
ABS resin has a smaller specific gravity than phenol resin and polyvinyl chloride, and its sedimentation speed is slower than that of phenol resin and polyvinyl chloride. Therefore, ABS resin is often carried in a circulating flow to the downstream side. Therefore, if a plurality of receiving boxes are provided at the bottom of the liquid medium tank provided with the selecting means, for example, along the flow direction of the circulation flow, the receiving box on the upstream side is provided with polyvinyl chloride or phenol resin having a large specific gravity. A lot of polystyrene will be added, and polystyrene and ABS resin will be added more as it goes to the receiving box on the downstream side.
In this case, if the selecting means has a function of generating a vortex in a part of the circulation flow in the liquid medium tank, it is possible to accurately select the receiving boxes on the upstream side and the downstream side. That is,
Due to the vortex generated, polystyrene with a low specific gravity, ABS
The resin floats higher than polyvinyl chloride and phenol resin, rides on the circulating flow, and flows into the receiving box on the downstream side, and polystyrene and ABS resin can be prevented from entering the receiving box on the upstream side.

Further, if the charging means is provided with a function of classifying the objects to be sorted by size and the circulation flow velocity adjusting means for adjusting the flow velocity of the circulation flow is provided for each small water channel, the accuracy of the sorting is further improved. It can be further improved. When the sizes of the plastic wastes are various, the plastic wastes are classified by size in the input means, and the wastes are divided into small water channels according to the size and are input. On the small waterway side, the flow velocity of the small waterway into which large plastic waste is input is high, and the flowrate of the small waterway into which small plastic waste is input is slow. Set the flow rate. If this is done, the accuracy of the selection will be better, and
Good sorting is possible over a wide range of plastic waste sizes.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 and 2 show a first embodiment of the present invention, showing an example in which the present invention is applied to the selection of plastics. FIG. 1 shows a plane of the plastic sorting device. In FIG. 1, reference numerals 1a, 1b, 1c and 1d denote small water channels partitioned by water channel dividing plates 2a, 2b and 2c, and liquid media for selecting specific gravity of plastics in the small water channels 1a, 1b, 1c and 1d. Is included. This liquid medium is adapted to circulate. That is, the liquid medium in the small water channels 1a, 1b, 1c, 1d is sucked by the circulation device 3 and supplied to the small water channels 1a, 1b, 1c, 1d from the water supply ports 4a, 4b, 4c, 4d. Since the small water channels 1a, 1b, 1c, 1d have the same configuration, the small water channel 1a will be described below.

FIG. 2 is a vertical sectional view of the small water channel 1a. In FIG. 2, a hopper 5 is installed above the small water channel 1a. From this hopper 5, a material to be sorted, which is made of a mixture of plastics having different specific gravities, is introduced into the small water channel 1a. Further, a stirring device 6a is provided in the small water channel 1a, and air bubbles adhering to the surface of the crushed material introduced from the hopper 5 can be removed. The small water channel 1a provided with the stirring device 6a becomes an underwater channel 7 formed by an upper guide 8 and a lower guide 9 (both of which have guide surfaces inclined so as to lower the channel toward the downstream side). There is.

A sorting section 10 is formed on the downstream side of the underwater channel 7. Then, in the sorting unit 10, a first sedimentation unloading device 11 for taking out the sorted objects to be sorted out,
A second sediment carry-out device 12 and a floating material carry-out device 13 are provided. The bottom of the sorting section 10 has receiving boxes 15 and 16 formed by a partition 14, and these receiving boxes 1 and 16 are provided.
The carry-out devices 11 and 12 are installed in 5 and 16. That is, the carry-out devices 11 and 12 are the waterway dividing plates 2a and 2b,
The small water channel 1 through the void formed near the bottom of 2c.
It is installed in a, 1b, 1c, 1d in a direction substantially at right angles.

On the downstream side of the sorting unit 10, a drainage unit 17 connected to the circulation device 3 is provided. The drainage unit 17 includes a strainer 18, a resistance plate 19 and a drainage duct 20. In addition, the injection port 21 is provided at the bottom of the sorting unit 10.
Is provided, and the flow rate of the liquid medium from the circulation device 3 is adjusted by the valve 22, and the liquid medium is jetted toward the bottom of the receiving box 15.

The circulating device 3 is a circulating flow generating device, the hopper 5 is a charging device, the stirring devices 6a to 6d are defoaming devices, the sorting unit 10 is a sorting device, and the unloading devices 11, 12, 1 are provided.
Reference numerals 3 respectively constitute unloading means.

In the above-mentioned structure, the objects to be sorted, which are introduced from the hopper 5 into the small water channel 1a and are made of mixed plastics having different specific gravities, are pushed into the small water channel 1a by the liquid medium injected from the water supply port 4a. At this time, air bubbles are often attached to the surface of plastics, and these air bubbles have a great influence on the sorting efficiency of the specific gravity sorting, and therefore it is necessary to remove the bubbles. Therefore, in this embodiment, the stirring device 6a is provided, and the stirring action of the stirring device 6a is used to remove the air bubbles adhering to the plastic surface. In this way, the object to be sorted from which air bubbles attached to the surface are removed is contacted with air so that the air bubbles will not be attached again, as shown by an arrow A in the underwater channel 7 formed by the upper guide 8 and the lower guide 9. It is conveyed and reaches the sorting unit 10.

In the sorting section 10, objects to be sorted having a smaller specific gravity than the liquid medium such as polyethylene or polypropylene float up and gather on the liquid medium water surface 23. On the other hand, polystyrene, A
Items to be sorted, which have a larger specific gravity than liquid media such as BS resin, phenol resin, and polyvinyl chloride, settle and receive
Although it enters the inside of No. 6, among the sedimented objects, those with a low specific gravity such as polystyrene and ABS resin enter the receiving box 16 mainly due to the circulation flow, and those with a large specific gravity such as phenol resin and polyvinyl chloride settle. Because it is fast, I mainly enter the receiving box 15. However, only the circulation flow is not completely selected, and the receiving box 15 also contains a part of polystyrene or ABS resin having a relatively small specific gravity.

Therefore, in this embodiment, the injection port 21 is provided in order to prevent the one having a relatively small specific gravity from entering the receiving box 15. That is, by injecting the liquid medium from the injection port 21 toward the bottom of the box 15 as shown by arrow B, the inside of the receiving box 15 is almost vertical along the flow in the direction of arrow A in the underwater channel 7. A vortex C is generated, and the upward flow of the vortex C causes polystyrene, AB having a small specific gravity
The S resin floats up high and rides on the circulating flow again to receive it.
It flows to. On the other hand, polyvinyl chloride and phenol resin having a large specific gravity are returned to the receiving box 15 by the downward flow of the vortex C. By this action, sorting between the settling plastics is performed more effectively.

By this action, it becomes possible to further sort the substances to be sorted in the sorting section 10 by the difference in specific gravity. The vinyl chloride-based plastics selected in this manner are taken out by the sediment first unloading device 11, the styrene-based plastics are taken out by the sediment second unloading device 12, and the floated plastics are taken out by the floating material unloading device 13, respectively.

On the other hand, the liquid medium passes through the sorting section 10 and then is sucked into the circulation device 3 through the drainage section 17. Here, the drainage unit 17 is composed of a strainer 18, a resistance plate 19 and a drainage duct 20, but the strainer 18 is provided to prevent the object to be sorted from being sucked into the circulation device 3, The resistance plate 19 and the drainage duct 20 are provided to prevent the influence of the vortex generated when the circulation device 3 sucks the liquid medium and to make the velocity distribution of the circulation flow in the sorting section 10 uniform. In the present embodiment, the strainer 18 and the resistance plate 19 are provided separately, but it is also possible to use them in combination.

In the present embodiment, in the sorting section 10, the lower ends of the waterway dividing plates 2a, 2b, 2c are floated from the bottom of the sorting section 10 to form a void, and the sediment first discharging device 1 is provided in the void.
1 and the sediment second unloading device 12 were installed. This is a small water channel 1a, 1b, 1c, 1d, and the first sediment unloading device 11 and the second sediment unloading device 12 are shared, and a plastic sorting device is used. This is done for the purpose of downsizing, and it is possible to provide both of the above-mentioned carry-out devices 11 and 12 for each small water channel.

Further, in the present embodiment, in the sorting section 10, the upper ends of the water channel dividing plates 2a, 2b, 2c are held below the water surface, and the floating plastic flows through the sorting section 10 by the circulation flow, and the small water channels 1a, 1b ,. Although it collects at the place of the floating material carry-out device 13 across 1c and 1d, water is jetted from the plurality of nozzles directed toward the floating material carry-out device 13 on the opposite side of the floating material carry-out device 13. By forming a surface flow toward the floating material carry-out device 13 on the water surface, the floating plastic can be positively collected by this surface flow.

Further, in this embodiment, a propeller type is used for the stirring device for separating air bubbles, and each propelling device is provided in each flow passage. It is also possible to make one through 2a, 2b and 2c.

The plastic sorting apparatus of this embodiment can have additional small water channels. For example, a small water channel unit 25 as shown in FIG.
5 should be installed on the side of the existing small waterway. In this case, a flat plate 26 is provided on one side surface of the small waterway unit 25.
It is necessary to mount the liquid medium so that the liquid medium does not flow out from the bottom or the top of the selection unit 10. In addition, small waterway unit 2
If a plurality of 5 are prepared, a large-scale plastic sorting device can be realized.

(Second Embodiment) FIG. 4 shows a second embodiment of the present invention and is a plan view of a plastic sorting apparatus. The feature of this embodiment is that, in the plastic sorting apparatus of the first embodiment, the amount of the liquid medium supplied into each small water channel 1a, 1b, 1c, 1d before each of the water supply ports 4a, 4b, 4c, 4d. Control valves 30a, 30 to adjust the
b, 30c, 30d and each small water channel 1 from the injection port 21
Adjustment valves 31a, 31b, 31c for adjusting the injection amount of the liquid medium to a, 1b, 1c, 1d are provided. These control valves 30a to 30d and 31a to 31c are provided in order to expand the range of the size of the plastic that enables sorting. That is, when a solid such as plastic flowing in a fluid becomes smaller, it becomes easier to float than a large solid. A slow flow rate is required to settle such small plastics. In this embodiment, the flow velocities in the small water channels 1a, 1b, 1c, 1d are changed based on this idea.

By changing the flow velocity for each small canal in this way, large plastics are sorted in small canals with a relatively high velocity, and small plastics are sorted in small canals with a slow velocity. By dividing each small waterway, it becomes possible to select the optimum flow velocity for the plastic flowing through each small waterway, which makes it possible to improve the sorting accuracy and to sort in a wide range of plastic sizes.

Further, the flow velocity in each small water channel can be adjusted by changing the resistance of the resistance plate 16 provided at the rear end of each small water channel for each small water channel, and the control valve 30a is also provided. By combining with -30d and 31a-31c, the flow velocity can be adjusted more reliably.

FIG. 5 shows an example in which a classification device 35 is provided in the plastic sorting device. The classifier 35 classifies plastics mixed with various materials into large, medium, and small sizes by using a sieve or the like. Since there are 3 types of classification, large, medium and small, the plastic sorting machine side has only one small waterway.
Three types of a, 1b, and 1c are provided. And the classified plastic is 1 small waterway for each size.
a, 1b, 1c, respectively. The flow velocity of the liquid medium in the small water channels is the highest in the small water channels 1a, and the small water channels 1b and 1
Since they are delayed in the order of c, the size of the injected plastic is large in the small water channel 1a, medium in the small water channel 1b, and small in the small water channel 1c. As a result, as described above, the mixed plastic that has been injected is selected in each small water channel at a flow rate suitable for the size of the plastic that is injected therein, so that accurate selection is possible. As a result of classifying into three types as shown in FIG. 5, an experiment showed that mixed plastic of 1 to 100 mm could be sorted with sufficient accuracy of about 98%.

The supply of the liquid medium to the injection port 21 in the above embodiment is shared with the circulation device 3 which supplies the liquid medium to the water supply ports 4a, 4b, 4c and 4d, but the supply amount of each liquid medium is changed. For more accuracy, the circulation devices may be provided independently.

(Third Embodiment) FIG. 6 shows a third embodiment of the present invention. FIG. 5 is an example in which the plastic sorting device having the classifying device shown in the second embodiment is installed in the waste treatment device. In FIG. 6, reference numeral 50 is a stock yard that stores waste roughly classified by type, and 51 is a supply device that supplies waste from the stock yard 50 to the pretreatment device 52. The pretreatment device 52 includes a refrigerant recovery part 53 and a large glass removal part 54. Further, 55 is a crushing device composed of a one-stage or two-stage crusher, 56 is a lightweight material sorting device, and 57 is a metal sorting device. The metal sorting device 57 includes a magnetic sorter 58 and a non-ferrous metal sorter 59. Reference numeral 60 is a plastic sorting device having a classifying device.

With the above construction, the waste treatment apparatus can sort and collect metal according to the material as well as the metal, and by treating with this apparatus, the amount of shredder dust or the like to be landfilled can be reduced as much as possible. Is possible.

Next, the processing flow in this waste processing apparatus will be described by taking the processing of discarded home electric appliances as an example. The household electric appliances collected by the collection truck are stored in the stockyard 50 in four categories, such as a refrigerator, an air conditioner, a TV, a washing machine, and the like. The waste home electric appliances stored in the stockyard 50 are taken out by type by the supply device 51 and sent to the pretreatment device 52. In the pretreatment device 52, when the discarded home electric appliances are refrigerators and air conditioners, first, as shown by arrow 100, the refrigerant recovery unit 53 described later extracts the refrigerant from the refrigerator and recovers the refrigerant as shown by arrow 101. If the discarded home appliances are TVs, as shown by arrow 102,
The cathode ray tube is removed by the large glass takeout unit 54. Here, the large glass take-out section 54 may have a structure in which the glass is crushed and separated by the compressive force of an impact type crusher or a press, which crushes and separates glass by hitting it with a hammer several times.

The waste home electric appliances which have been subjected to these pretreatments are sent to the crushing device 55 as shown by an arrow 104. Also,
When the discarded home electric appliances are washing machines or the like and the household electric appliances other than the refrigerator, the air conditioner, and the TV are discarded, they are directly sent to the crushing device 55 as shown by arrows 103 and 104. Crushing device 55
Is crushed to a size of about 50 to 100 mm by a one-stage or two-stage crushing mechanism and released for each material. Particularly in the case of a refrigerator, urethane foam needs to be released from a thin iron plate, and for this purpose, a multistage crushing mechanism is advantageous.

The waste material crushed by the crushing device 55 and released for each material is sent to the light weight material separating device 56 as shown by an arrow 105, and the light weight material separating device 56 separates the foam molding material such as urethane foam. Then, the foamed material is treated as a light waste, and as shown by an arrow 107, the foamed material recovery device 61
Arrow 1 indicates the heavy waste sent to
It is sent to the metal sorting device 57, as indicated by 06.

Here, one of the structures of the light weight sorting apparatus 56 is that the foamed molding material is very light compared with other waste materials, and air is sent to the waste material that has left the crushing apparatus 55. It is possible to use a structure in which the foamed molding material is sprayed to blow off the foamed molding material and the foamed molding material is separated. As another structure, it is possible to use a structure in which an inclined vibration conveyor is used and a light foam molding material is taken out from the upper part and other heavy wastes are taken out from the lower part.

In the metal separating device 57, first, the magnetic sorter 58 is used.
At, the iron-based metal is separated and recovered as iron-based as shown by the arrow 108. Next, the non-ferrous metal separator 59 separates the non-ferrous metal and collects it as shown by an arrow 109. As a result, the main content of the remaining waste is plastics. This plastic waste is indicated by arrow 110.
It is sent to the plastic sorting apparatus 60 as shown by.

The plastic sorting device 60 has a classifying device 35.
The classifying device 35 classifies the plastic into three types of large, medium, and small, and particularly fine particles (sand, etc.) are taken out as dust as shown by an arrow 111. Plastics classified into large, medium and small by the classifier 35 are indicated by arrows 112, 113 and 11 respectively.
It is sent as shown in FIG. 4 and put into the small water channels 1a, 1b, 1c. The flow velocity of the liquid medium in the small water channels 1a, 1b, 1c is
It is set according to the size of the plastic to be input. That is, since the small waterway 1a is the fastest, the small waterway 1b is medium, and the small waterway 1c is the slowest, the plastic in each small waterway is an olefin-based resin made of polyethylene or polypropylene, which is shown in the arrow 115 and is easy to recycle. Most groups of plastic, arrow 11
The group consisting mainly of recyclable styrene-based plastics composed of polystyrene or ABS resin shown in 6 and vinyl chloride-based plastic which is difficult to reuse due to generation of chlorine gas at the time of recycling as shown by arrow 117 occupies the majority. Efficiently sorted and collected into three types of groups.

On the other hand, the foam molded article separated by the light weight sorting apparatus 56 is the foam material collecting apparatus 6 as shown by the arrow 107.
1 and separated into a solid resin portion and a gaseous foaming agent by the foaming agent recovery device 61, where the solid resin portion is separated and recovered as indicated by an arrow 118, and the foaming agent is liquefied. Recovered as indicated by arrow 119.

By separating and collecting as described above,
It becomes possible to recover the refrigerant and the freon of the foaming agent, which could not be recovered conventionally. Further, in addition to recovering metals, plastics that are suitable for reuse can be recovered as a resource by separating plastics, so that the amount of waste to be landfilled can be significantly reduced.

[0049]

As described in detail above, according to the present invention,
By adding a small waterway unit, the sorting capacity can be easily increased. Further, if the flow velocity of the circulating flow is changed for each small water channel and the objects to be sorted having different sizes are fed into each small water channel, the sorting can be performed accurately and efficiently. Further, the power consumption of the device for generating the circulating flow is low, and a large amount of industrial processing can be performed.

[Brief description of drawings]

FIG. 1 is a plan view of a plastic sorting apparatus according to a first embodiment of the present invention.

2 is a cross-sectional view of the plastic sorting device shown in FIG.

FIG. 3 is a perspective view of a small water channel unit.

FIG. 4 is a plan view of a plastic sorting apparatus according to a second embodiment of the present invention.

FIG. 5 is a plan view of a plastic sorting device having a classifying device.

FIG. 6 is a diagram when a plastic sorting device is installed in a waste treatment device.

[Explanation of symbols]

 1a-1d Small water channel 2a-2c Water channel dividing plate 3 Circulating device 4a-4d Water inlet 5 Hopper 6a-6d Stirrer 7 Underwater channel 8 Upper guide 9 Lower guide 10 Sorting part 11 Sediment first discharge device 12 Sediment second Carry-out device 13 Float-carrying-out device 14 Partitions 15, 16 Receiving box 17 Drainage part 18 Strainer 19 Resistor plate 20 Drainage duct 21 Injection port 22 Valve 25 Small water channel unit 26 Flat plate 30a-30d, 21a-21c Control valve 35 Classifier 50 Stock Yard 51 Supply device 52 Pretreatment device 53 Refrigerant recovery part 54 Large glass removal part 55 Crushing device 56 Lightweight material separation device 57 Metal separation device 58 Magnetic sorter 59 Non-ferrous metal sorter 60 Plastic sorter 61 Foaming agent recovery device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuaki Aragane 502 Kintate-cho, Tsuchiura-shi, Ibaraki Prefecture Hiritsu Manufacturing Co., Ltd.

Claims (6)

[Claims] 1. A liquid medium tank in which a liquid medium is stored, a circulating flow generating means for generating a circulating flow in the liquid medium in the liquid medium tank, and an object to be sorted, in which objects having different specific gravities are mixed, A charging means for charging the circulating flow into the liquid medium tank from the upstream side, and the object to be sorted, which is provided in the liquid medium tank and is flown on the circulating flow, which is charged by the charging means, In a mixture sorting device including a sorting unit that sorts by specific gravity using a difference in specific gravity, and a carry-out unit that carries out an object to be sorted sorted by the sorting unit to the outside, the liquid medium tank is divided into a plurality of parts. A small water channel is provided, the circulation flow generating means, the charging means, and the sorting means are installed for each of the small water channels, and the carry-out means is shared by all of the small water channels. apparatus. 2. A liquid medium tank in which a liquid medium is stored, a circulation flow generating means for generating a circulation flow in the liquid medium in the liquid medium tank, and an object to be sorted, in which objects having different specific gravities are mixed, By charging means for charging from the upstream side of the circulation flow into the liquid medium tank, and stirring the charged objects to be sorted in the liquid medium,
A defoaming unit that removes bubbles adhering to the object to be sorted, and the object to be sorted that is provided in the liquid medium tank and is defoamed by the defoaming unit and flows along the circulation flow The selected material having a smaller specific gravity is floated, and the selected material having a larger specific gravity is settled and selected, and the settling object is further sorted by specific gravity using a circulating flow, and the sorting means. In the mixture sorting apparatus including a carry-out means for carrying out the sorted objects to the outside, a plurality of divided small water channels are provided in the liquid medium tank, and the circulation flow generation means, input for each of the small water channels. A mixture sorting apparatus, characterized in that a means, a defoaming means and a sorting means are installed and the carrying-out means is shared by all of the small water channels. 3. A liquid medium tank in which a liquid medium is stored, a circulating flow generating means for generating a circulating flow in the liquid medium in the liquid medium tank, and an object to be sorted, in which objects having different specific gravities are mixed, By charging means for charging from the upstream side of the circulation flow into the liquid medium tank, and stirring the charged objects to be sorted in the liquid medium,
A defoaming unit that removes bubbles adhering to the object to be sorted, and the object to be sorted that is provided in the liquid medium tank and is defoamed by the defoaming unit and flows along the circulation flow The selected material having a smaller specific gravity is floated, and the selected material having a larger specific gravity is settled and selected, and the settling object is further sorted by specific gravity using a circulating flow, and the sorting means. In the mixture sorting apparatus including a carry-out means for carrying out the sorted objects to the outside, a plurality of divided small water channels are provided in the liquid medium tank, and the circulation flow generation means, input for each of the small water channels. Means, defoaming means, and sorting means are provided, and the carrying-out means is shared by all of the small water channels, and a circulation flow velocity control means for adjusting the flow velocity of the circulation flow for each of the small channels is provided. A mixture selection device. 4. The sorting apparatus according to claim 2 or 3, wherein the sorting means generates vortices in a part of the circulation flow in the liquid medium tank to further sort the settled sorted objects by specific gravity. A mixture sorting device characterized by sorting. 5. The sorting apparatus according to claim 1, 2, or 3, wherein the charging unit sorts the objects to be sorted according to size.
A mixture sorter characterized in that it is charged into each of the small water channels according to size. 6. A waste treatment device comprising the mixture sorting device according to claim 1.