WO2005075087A1 - Device for sorting lightweight waste materials and method of sorting mixed waste materials - Google Patents

Abstract

A device for sorting lightweight materials and method of sorting mixed waste materials that are capable of efficiently recovering lightweight materials having small specific gravities and having small differences in the specific gravities. The device for sorting lightweight materials has a sorting vessel (5) for sorting lightweight materials by differences in specific gravities in liquid; vertical pulsation means (6) having an air chamber (61) for vertically pulsating the liquid in the sorting vessel (5); a floor net (71) for partitioning the inside of the sorting vessel (5) into upper and lower sides; a ceiling net (16a) provided above the floor net (71) and inclined while descending to the recovery opening (13) side; an inclined sorting screen section (16) having granular objects (73) laid in layers in the gap between the floor net (71) and the ceiling net (16a) such that the thickness of the objects is thinner on the recovery opening (13) side than on the loading opening (11) side; and a rotary feeder (9) provided in the recovery opening (13) and recovering sorted waste materials. The angle β of the inclination of a straight line connecting the recovery opening (13) and the upper end section of the rotary feeder (9) is set equal to or more than the angle α of the inclination of the ceiling net (16a).

Description

 Specification

 Lightweight waste material sorting device and mixed waste material sorting method

 Technical field

 The present invention relates to a lightweight waste material sorting apparatus and a method for sorting mixed waste materials, and particularly to a high-precision shredder dust such as a resin and a plastic among shredder dusts obtained by crushing home electric appliances and waste automobiles. The present invention relates to a lightweight waste material sorting apparatus and a mixed waste material sorting method which are suitable for sorting and collecting waste materials.

 Background art

 [0002] Conventionally, mixed waste materials obtained by crushing home electric appliances and end-of-life vehicles have been buried or incinerated. In recent years, however, there has been developed a technique for separating and sorting these mixed waste materials for each raw material to effectively recycle them. Proposed. For example, as a technique for recovering a metal material adhered to resin such as a printed circuit board, a method of burning only the resin portion and separating and recovering metals such as copper is known. However, burning resin while producing it has the problem of generating gases harmful to the human body and the global environment.

 [0003] On the other hand, a method of crushing the mixed waste material, and separating and sorting by a specific gravity sorting device used for specific gravity sorting of coal, aggregate, and the like can be considered. This specific gravity sorting device generally has a water tank provided with a partition net, and pulsation means for pulsating water in the water tank up and down. By pulsating the crushed material put on the partition net in water, those having a high specific gravity are sedimented in the lower layer, and those having a low specific gravity are sedimented in the upper layer to separate and collect.

[0004] However, the specific gravity sorting apparatus described above sorts waste materials having a relatively heavy weight or a large difference in specific gravity, such as polystyrene, rubbers, and polyvinyl chloride. We were able to accurately sort lightweight waste materials. In other words, when the specific gravity is selected by the conventional vertical pulsation, the resin-based lightweight waste material immediately floats and cannot be sorted out, or it takes a considerable amount of time to settle. In addition, when collecting with a rotary feeder, there is also a problem that the sedimentary layer collapses, and if the resin is collected at a location far away from the collecting location, impurities are mixed in. [0005] Furthermore, resin-based waste materials have a small difference in specific gravity. For example, polychlorinated vinyl is 1.35-1.55, polystyrene strength S1.04-1.06, polyethylene strength SO.94-0.97. Polyp P-pyrenka is 0.90-0.91 and is easily mixed and cannot be sorted out using a normal specific gravity difference sorter.

 [0006] Incidentally, an invention relating to a technique for sorting waste materials is described in, for example, JP-A-2002-355661. According to the present invention, waste material consisting of resin and metal powder is crushed by a crusher, and the crushed material is separated into a magnetic material and a non-magnetic material by a magnetic separator, and the non-magnetic material is separated into a jig separator (specific gravity separator). Separation between resin and metal by separation.

 Patent Document 1: Japanese Patent Application Laid-Open No. 2002-355661

 Disclosure of the invention

 Problems to be solved by the invention

 [0008] The invention described in Japanese Patent Application Laid-Open No. 2002-355661 does not disclose a technique capable of selecting a resin-based lightweight waste material. In addition, the jig sorting machine is inclined so that the waste net at the entrance is rolled down and moved to the recovery opening to move and collect it.However, since more waste is stacked at the recovery opening, the waste is stacked. Unless pulsation is performed at a sufficiently high flow rate, specific gravity cannot be sufficiently sorted. If a pulsation with a large flow velocity is used, the effect on the inside of the recovery port will increase, and there will be problems such as backflow and collapse of the sedimentary layer.

 [0009] The present invention has been made to solve such a problem, and a lightweight waste material sorting apparatus and a mixed waste material sorting method capable of accurately collecting lightweight waste materials having a small specific gravity and a small specific gravity difference. For the purpose of providing!

 Means for solving the problem

[0010] The characteristics of the mixed waste material sorting apparatus according to the present invention are that a lightweight waste material is placed in a liquid, a sorting tank for sorting the waste material by a difference in specific gravity, and the liquid in the sorting tank is pulsated in a vertical direction. An upper and lower pulsating means having an air chamber, a floor net dividing the inside of the sorting tank up and down, a ceiling net placed above the floor net and inclined downward to the collection port side, and the floor net and the ceiling net In the gap, the inclined sorting screen section with a large number of granular materials with the collection port side laminated thinner than the input port side, and the rotary feeder that is arranged in the collection port and collects the sorted waste materials. A straight line connecting the collection port and the upper end of each of the rotary feeders. The point is that the inclination angle of the line is set to be equal to or larger than the inclination angle of the ceiling net.

 Further, in the present invention, in order to attenuate vertical pulsation propagating from the inside of the sorting tank to the inside of the recovery port, a pulsation damping plate formed to an arbitrary length in accordance with the amplitude of the pulsation is provided by a rotary feeder. It is preferable to hang upward.

 [0012] Further, in the present invention, in order to reduce the width of the waste material recovered in the recovery port to move up and down, the waste material vertical movement suppressing plate inclined upward in the recovery direction is provided with the recovery port and the pulsation attenuation plate. It is preferable to provide between them.

 [0013] Further, in the present invention, the upper and lower pulsation means intermittently exhausts the air in the air chamber when the liquid descends in the vertical pulsation cycle, in order to increase the sedimentation speed difference of the lightweight waste material. It is preferable that the displacement per hour be larger than the supply amount per unit time when the liquid rises.

 [0014] Further, the characteristics of the method for sorting mixed waste materials according to the present invention are as follows: a mixed waste material is placed in a liquid, and a sorting tank that sorts the mixed waste material according to a difference in specific gravity thereof; and the liquid in the sorting tank is pulsated vertically. A method for sorting mixed waste materials in a mixed waste material sorting apparatus having vertical pulsation means provided with an air chamber and a screen part for vertically separating the sorting tank, wherein the mixed waste material is set up and down in order to increase the sedimentation speed difference. The point is that the air in the air chamber is intermittently exhausted when the liquid descends in the pulsation cycle, and the amount of exhaust per unit time is made larger than the supply amount per unit time when the liquid rises.

 The invention's effect

 According to the present invention, it is possible to accurately recover mixed waste materials having a small specific gravity and a small specific gravity difference.

 BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of a lightweight waste material sorting apparatus 4 according to the present invention will be described with reference to the drawings.

 FIG. 1 is a flowchart showing the entire process of sorting mixed waste materials to which the lightweight waste material sorting device 4 according to the present invention is applied. FIG. 9 is an embodiment of the lightweight waste material sorting device 4 of the present embodiment. FIG.

First, the flow of the entire selection process will be described with reference to FIG. This embodiment The mixed waste material sorting process mainly consists of a mixed waste material crushing process, an iron waste material sorting process, a non-ferrous waste sorting process, a linear waste material sorting process, a lightweight waste material crushing process, a suspended material crushing process, and

It consists of a lightweight waste material sorting process and a second lightweight waste material sorting process (Step S1—Step S8).

 First, the mixed waste material crushing step of step S1 is a step of crushing mixed waste materials such as home electric appliances using a crusher such as a chain mill. In this process, the mixed waste material is cut or crushed to a size of about 0.1 mm to 40 mm. At this time, the mixed waste materials include various types of waste materials having various specific gravities and shapes, such as granular waste materials, sheet-like waste materials such as rubber sheets, and linear waste materials having a strong force such as copper wire and noise. Mixed. In addition. The mixed waste materials selected in the following embodiment include waste iron materials and non-ferrous waste materials. Further, the non-ferrous waste materials include copper wire debris, resin, harness, substrate debris, non-ferrous metals, and achlorinated metal. Tolylbutadiene styrene resin (hereinafter referred to as “ABS resin”), polystyrene (hereinafter referred to as “1 ^”), rubbers, polychlorinated butyl (hereinafter referred to as “PVC”), polyethylene (hereinafter “PE”) "), Polypropylene (hereinafter referred to as" PP "), urethane, and the like.

 Next, the iron waste material sorting step of step S2 is a step of removing magnetic iron waste materials such as iron contained in the mixed waste material by a predetermined magnetic separator. Specifically, the crushed mixed waste material is transported by a vibrating conveyor, and the magnetic stone placed near the vibrating conveyor is strongly excited, so that only the iron waste material is adsorbed and sorted.

 [0021] Next, the non-ferrous waste sorting step of step S3 is a step of sorting non-ferrous waste from which iron waste has been removed based on a difference in specific gravity and a difference in shape. In this step, a non-ferrous waste sorting system 2 configured by connecting three non-ferrous waste sorting apparatuses 1 of the present embodiment, which will be described later, is used. By this non-ferrous waste sorting system 2, non-ferrous waste can be separated from relatively short linear waste (copper wire scrap, resin, etc.), relatively long linear waste (harness, copper wire scrap, etc.), substrate scrap, Metals, lightweight waste materials (ABS resin 'PS' PVC) and sheet waste materials (rubbers), and suspended matter (PE, PP, urethane, etc.).

Next, the linear waste material sorting process in step S4 is a process of further sorting the relatively short linear waste materials sorted in step S3 based on a difference in specific gravity and a difference in shape. In this step, a linear waste material sorting apparatus 3 of the present embodiment described later is used. This linear waste material sorting The device 3 sorts the small-sized linear waste material into copper wire scrap, resin A having a high specific gravity, and resin B having a low specific gravity.

 Next, the lightweight waste material crushing step of step S5 is a step of crushing the lightweight waste material selected in step S3 by a crusher such as a plastic crusher. In this process, lightweight waste materials are further cut or crushed.

 Next, the suspended matter crushing step of step S6 is a step of crushing the suspended matter selected in step S3 by a crusher such as a plastic crusher. In this step, the suspended matter is further cut or crushed, and then dehydrated and collected by a dehydration screen or the like.

 Next, the first lightweight waste material sorting step of step S7 is a step of further sorting the lightweight waste materials crushed in step S5 by a difference in specific gravity. In this step, a lightweight waste material sorting apparatus 4 of the present embodiment, which will be described later, is used. The lightweight waste material sorting device 4 sorts the lightweight waste materials into PVC rubbers, ABS resin, and PS.

 Next, the second lightweight waste material sorting step of step S8 is a step of further sorting the lightweight waste materials crushed in step S7 by a specific gravity difference. In this step, similar to step S7, a lightweight waste material sorting apparatus 4 of the present embodiment described later is used. The lightweight waste material sorting device 4 sorts the lightweight waste materials into PVC and rubbers.

 Through the above steps, various kinds of mixed waste materials having different specific gravities and shapes are separated for each raw material.

 Hereinafter, the sorting apparatus used in each step will be described in detail. First, the non-ferrous waste sorting apparatus 1 and the non-ferrous waste sorting system 2 of the present embodiment used in the non-ferrous waste sorting step of step S3. Will be described with reference to FIG.

 (1) Non-ferrous waste sorting device and non-ferrous waste sorting system

The non-ferrous waste sorting system 2 of the present embodiment includes a first non-ferrous waste sorting device la into which non-ferrous waste is first introduced, and a second non-ferrous waste sorting device la connected to the first non-ferrous waste sorting device la. It consists of a waste material sorting device lb and a third non-ferrous waste material sorting device lc. In the present embodiment, since the basic structure of each of the non-ferrous waste sorting devices la, lb, and lc is almost the same, among the configurations of the second non-ferrous waste sorting device lb and the third non-ferrous waste sorting device lc, Regarding the same or equivalent configuration as the configuration of the first non-ferrous waste sorting device la The same reference numerals are given.

 [0030] The first non-ferrous waste sorting apparatus la mainly includes a sorting tank 5 filled with water, vertical pulsation means 6 for pulsating the water in the sorting tank 5 in the vertical direction, and vertically moving the sorting tank 5 up and down. A sorting screen section 7 for partitioning, a variable wing 8 provided below the sorting screen section 7, a rotary feeder 9 for collecting a layered waste material settled on the sorting screen section 7, and a sorting screen section. The mesh force of 7 also includes a rotary valve 10 for collecting the dropped linear waste material.

 [0031] Each component of the first non-ferrous waste material sorting apparatus la of the present embodiment will be described in more detail. The sorting tank 5 is formed in a rectangular parallelepiped shape having a substantially square planar cross section. In the upper part of the sorting tank 5, an input port 11 for mixed waste material is provided, and an appropriate amount of mixed waste material is supplied by a water wheel feeder 12 together with water. In addition, a collection port 13 is provided on the opposite side of the input port 11 so that the waste material settled in the lowermost layer on the sorting screen unit 7, which is a relatively long copper wire debris and noise, can be supplied to the rotary feeder 9. It plays the role of pulling in by the suction force of. Further, a supply / exhaust port 62 communicating with an air chamber 61 described later is formed on a side wall of the sorting tank 5.

 Next, the vertical pulsation means 6 mainly includes an air chamber 61 provided in the sorting tank 5, an air blower 63 for supplying air to the air chamber 61 through a supply / exhaust port 62, and the air blower 63. And an air valve 64 for adjusting the supply / exhaust timing of the power supply. The lower end of the air chamber 61 is opened, and the upper roof 61a is formed in a mountain shape. The air blower 63 stores the pressurized air in an air tank 65 connected to each air valve 64. The air valve 64 is configured by, for example, a rotary valve, and is rotated by a valve motor 66 to open and close, and supplies and exhausts the air chamber 61. In this embodiment, in order to stabilize the flow of the water surface up to the first non-ferrous waste sorting device la and the third non-ferrous waste sorting device lc, the supply and exhaust timing of the first non-ferrous waste sorting device la and the third non-ferrous waste sorting device lc Are synchronized, and the supply and exhaust timing of the second non-ferrous waste sorting device lb is shifted by half the phase.

Further, in the present embodiment, by controlling the rotation of the valve motor 66, as shown in FIG. 3, the air in the air chamber 61 at the time of descending is intermittently discharged during the vertical pulsation cycle of water. I noticed and stopped the descent temporarily. And when lowering again, lower strongly and quickly The This is because the sedimentation speed of substances with different specific gravities causes the most noticeable disparity when falling from a stationary state, so that sorting based on specific gravity is effectively performed using this principle. .

 [0034] Accordingly, the air in the air chamber 61 is intermittently exhausted, the descent of the water is temporarily stopped, and the descent is started again, so that the sedimentation speed of the waste materials having different specific gravities is amplified. It comes to sort more accurately.

 Further, as described above, in order to stop the evacuation when descending, the amount of evacuation per unit time is increased in order to recover the time for this stop. In other words, it is necessary to repeat the pulsation cycle in accordance with the cycle of the rotary valve 10, so that the amount of exhaust air per unit time when descending is set larger than the amount of air supply per unit time when water rises. . If the air supply time and the exhaust time are equal, the intermittent exhaust will make it impossible to exhaust all the supplied air. Therefore, by increasing the amount of exhaust air per unit time to equalize the amount of supply air and the amount of exhaust air, the water in the sorting tank 5 pulsates at a constant vertical width, thereby enabling stable specific gravity separation.

 [0036] The sorting screen unit 7 includes a floor net 71 fixed in the sorting tank 5, a partition wall 72 that divides the floor net 71 into a plurality of sections, and a plurality of granular materials 73 laid in each section. Have. The floor net 71 is formed in a substantially square shape having substantially the same shape as the plane cross section of the sorting tank 5, and has a mesh size large enough not to drop the particulate matter 73. The partition wall 72 is erected in a substantially vertical direction on the floor net 71, and divides the floor net 71 into a plurality of sections as shown in FIG. The granules 73 are composed of spherical bodies having an appropriate specific gravity, such as stainless steel balls and ceramic balls, and are laid in each section to limit the amount of water passing therethrough.

In the present embodiment, as shown in FIG. 4, the particle size of the particulate matter 73 laid in the section on the input port 11 side is smaller than that on the recovery port 13 side. This is to arbitrarily limit the amount of water that can be pushed upward by the pulsation of the water by the vertical pulsation means 6 to pass through the sorting screen unit 7 so as to increase in accordance with the distance from the collection unit 13. As a result, as shown in FIG. 5, the water flow is weak at the recovery port 13 side and the flow velocity is small, and the water flow at the input port 11 side is strong and the flow velocity is high. Therefore, even if non-ferrous waste including sheet-like waste is input, it is possible to prevent the sheet-like waste from entering the water due to strong upward flow at the inlet 11 side. You can. Further, the flow over the water surface can be strengthened. In addition, as described above, the amount of passing water is not limited to the configuration in which the particle size of the granular material 73 is adjusted, but the laying density of the granular material 73 may be adjusted, that is, in the section closer to the input port 11 than the recovery port 13 side. By reducing the laying density of the granular material 73 to be laid, the water flow at the inlet 11 side may be strengthened, and the water flow at the recovery port 13 may be made uniform and gentle.

Further, as shown in FIG. 4, the sorting screen unit 7 of the present embodiment includes a bottom area force input port 11 side of a section of each section at a position facing the roof 61a of the air chamber 61. It is partitioned so as to have an area larger than the bottom area of the section on the collection port 13 side. This is because above the roof 61a of the air chamber 61, the right and left forces of the air chamber 61 are joined together by the pushed-up water, and the water flow is disturbed. In other words, by passing the turbulence generated at the junction through a section with a large bottom area, the conditions and conditions of passage can be made almost equal, and the direction of the flow velocity and the strength of the water flow can be adjusted. On the other hand, the force directly above the air chamber 61 does not cause any significant turbulence due to the water being pushed straight up at the inlet 11 side and the recovery port 13 side which are separated to the left and right. Therefore, the section area of the floor net 71 is formed small, and the direction of flow of water is stably directed by each partition wall 72 so that a desired surface flow is generated.

 [0039] Further, in the sorting screen section 7, the granular material 73 is accommodated in a net-like container formed in the size of each section. This is because when the particle size of the granular material 73 is arbitrarily changed according to the type of waste material to be sorted, it can be easily and quickly changed, and the mesh can be easily cleaned, and the sorting accuracy is maintained. It contributes to.

[0040] Next, the variable wing 8 changes the flow direction of the water pushed upward by the air chamber 61 to form a water flow that flows horizontally from the input port 11 side to the recovery port 13 side. . As shown in FIG. 2, a plurality of variable blades 8 are juxtaposed laterally at a predetermined interval between the sorting screen unit 7 and the air chamber 61. Each of the variable wings 8 can adjust its inclination angle arbitrarily. Therefore, in order to maintain a delicate relationship between the generated surface water flow and the vertical pulsating flow, the inclination direction of each variable wing 8 is appropriately set, and the water flow that passes through the sorting screen unit 7 to float the non-ferrous waste material The direction of is adjusted. As will be described later, the first non-ferrous waste sorting device la collects the upper and lower pulsating water streams against the partition wall 72 on the inlet 11 side. The light is reflected to the port 13 side, and generates a water flow from the input port 11 side to the recovery port 13 side.

 Next, in the rotary feeder 9, a plurality of recovery blades 91 are radially arranged at equal intervals on the outer peripheral surface of a columnar rotating body (not shown). The rotary feeder 9 is provided inside the recovery port 13 of each of the non-ferrous waste sorting devices la, lb, and lc, and is rotatably driven by a motor or the like. Further, the rotary valve 10 is provided at the lowermost part of the sorting tank 5, and collects waste materials dropped through the sorting screen 7. The rotary valve 10 of the present embodiment is controlled so as to interlock with the vertical pulsation means 6, so that when collecting copper wire debris or the like dropped from the floor net 71, the timing at which air is exhausted from the air chamber 61 is adjusted. At the same time, the lowermost part is opened so that falling objects are collected while water is not discharged more than necessary.

 Next, a description will be given of configuration differences or related points of the first non-ferrous waste material sorting device la to the third non-ferrous waste material sorting device lc that constitute the non-ferrous waste material sorting system 2.

 First, the sorting tank 5 will be described. Each sorting tank 5a, 5b, 5c is set so that the amount of water overflowing from the first non-ferrous waste sorting device la is equal to the amount of water that is simultaneously received by the second non-ferrous waste sorting device lb and the third non-ferrous waste sorting device lc. Have been. This is to keep the surface current flowing on the water surface of each non-ferrous waste sorting device la, lb, lc flowing without stagnation. In other words, when the amount of water overflowing from the first non-ferrous waste sorting device la is received by the second non-ferrous waste sorting device lb, a part of the amount of water is accepted, the remaining amount of water is overflowed, and the third non-ferrous waste sorting device la lc also accepts part of the overflowed water volume and overflows the rest of the second non-ferrous waste sorting device lb power. In this way, if a part of the water volume that is always received overflows, the first, third and third non-ferrous waste sorting devices la, lb, and lc do not need to generate a water surface flow. The second and third non-ferrous waste sorters lb and lc, which do not block the generated surface flow, can continuously maintain the surface flow. Then, the sheet-like waste material floating on the surface of the water is not settled in the water due to the undisturbed surface flow, so that the waste material can be sorted as it is without involving other waste materials.

In order to satisfy the above-mentioned water amount condition, in the present embodiment, as shown in FIG. The plane cross-sectional area of the sorting tank 5a in the non-ferrous waste sorting apparatus la should be equal to the sum of the plane cross-sectional areas of the sorting tanks 5b and 5c in the second non-ferrous waste sorting apparatus 1b and the third non-ferrous waste sorting apparatus lc. Designed. It should be noted that if the above water amount condition is satisfied, there is no need to provide a difference in the planar sectional area of each of the sorting tanks 5a, 5b, 5c. For example, it is theoretically possible to adjust the amount of water that overflows by controlling the height of the water surface that moves up and down.However, separately, the separation tanks 5b and 5c of the second and third non-ferrous waste sorting devices lb and lc are separately provided. Water supply must be continued, and there is a problem that turbulence in the water flow is likely to occur.

Next, the particle size relationship of the granular material 73 laid on the floor net 71 will be described. Comparing the particle size of the granular material 73 laid in each section, the first non-ferrous waste sorting device la is formed to be relatively larger than the second and third non-ferrous waste sorting devices lb, lc. Yes. In other words, the granular material 73 laid in any of the sections of the floor net 71 in the first non-ferrous waste sorting apparatus la is divided into the sections in the second and third non-ferrous waste sorting apparatuses lb, lc corresponding to the section. A particle having a particle size that is about lmm larger than the granular material 73 laid on the ground is used. This is because the first non-ferrous waste sorting apparatus la plays a role of separating copper wire debris, resin, and the like in the first stage as finely as falling from the mesh of the floor net 71. On the other hand, in the second and third non-ferrous waste sorting devices lb and lc, since there is no copper wire debris that can be dropped from the floor net 71, the mesh is finely divided and the granular size is small. This is because the object 73 is laid to generate a more uniform upward flow on the floor net 71.

Next, the difference between the inclination angles of the variable blades 8 in the first to third non-ferrous waste sorting devices la, lb, and lc will be described. As shown in FIG. 2, the variable wings 8 in the first non-ferrous waste sorting device la are inclined in the opposite direction (toward the input port 11) with respect to the recovery port 13, and the second non-ferrous waste sorting device lb and the second 3 The variable wings 8 in the non-ferrous waste sorting equipment lc are inclined in the direction of the recovery port 13. In each case, apart from the vertical pulsation, the surface flow is generated on the water surface and maintained. That is, in the first non-ferrous waste sorting apparatus la, the pushed water changes its direction along the variable wings 8 and is reflected by coming into contact with the inlet 11 of the sorting tank 5 and the side wall surface or the partition wall 72. On the other hand, since the nonferrous waste material is injected together with water from the input port 11, the above-mentioned reflected water stream and the input water stream join together, and are directed to the recovery port 13 side (Fig. 2). A water flow to the right (to the right) occurs. A rubber sheet or the like flows along with the surface flow. In the present embodiment, the variable wings 8 of the first non-ferrous waste sorting apparatus la are inclined at an angle of 2-3 degrees toward the inlet 11 with respect to the vertical direction.

[0047] On the other hand, the second non-ferrous waste sorting device lb and the third non-ferrous waste sorting device lc may maintain the flow velocity and directionality of the already generated water surface flow without having to separately generate the water surface flow. Therefore, in the second non-ferrous waste sorting device lb and the third non-ferrous waste sorting device lc, the variable wing 8 is inclined toward the recovery port 13 side, and the water passing therethrough is only a pulsation that pushes up the non-ferrous waste material. It is designed to boost the flow. The variable wings 8 of the second non-ferrous waste sorting device lb and the third non-ferrous waste sorting device lc are inclined 5-10 degrees toward the recovery port 13 with respect to the vertical direction.

 Next, a non-ferrous waste sorting step (step S3) using the non-ferrous waste sorting system 2 of the present embodiment will be described.

 First, in step S 2 described above, the non-ferrous waste material from which the magnetic waste material has been removed is injected into the inlet 11. The supplied non-ferrous waste material is supplied by a water wheel feeder 12 in an appropriate amount onto the sorting screen section 7 of the first non-ferrous waste sorting device la. In the sorting tank 5 of the first non-ferrous waste sorting device la, the water pushed up by the variable wings 8 is guided obliquely to the inlet 11 side, and due to the difference in the laying density of the particulate matter 73 in the sorting screen 7, the inlet 11 is closer to the inlet 11 By generating a strong and fast current, a surface current that flows over the water surface is generated in addition to the vertical pulsation. The sheet-like waste material rides on this surface flow and flows out to the second non-ferrous waste sorting device lb.

 [0050] On the other hand, below the water surface, due to the pulsation in the vertical direction, waste materials having a large specific gravity settle to the lower layer, and waste materials having a small specific gravity are stacked upward to form a sedimentary layer. Since the laying density of the particulate matter 73 is high at the recovery port 13 side, a gentle up and down pulsation of the water flow occurs, and a quieter sediment layer is formed than at the input port 11 side.

 [0051] Further, in the descending process of the vertical pulsation cycle, the air in the air chamber 61 is intermittently exhausted, and when the descending is restarted, the displacement is increased. The sorting process is being promoted by amplifying the difference.

[0052] In the first non-ferrous waste sorting apparatus la, the large-grained particulate matter 73 causes copper wire debris and resin waste to drop from the floor net 71 from gaps. Copper wire debris that has settled at the bottom of When the rotary valve 10 is opened in accordance with the evacuation operation from 1, the material is transferred to the next linear waste material sorting step (step S4).

 [0053] In the first non-ferrous waste sorting apparatus la, the harness and the copper wire debris settle in the lowermost layer of the sedimentation layer on the sorting screen unit 7. When the lowermost layer has settled to some extent, the rotary feeder 9 rotates, and the sorted waste materials are sequentially separated and collected. On the other hand, waste materials other than harnesses and copper wire scraps flow over the recovery port 13 to the second non-ferrous waste sorting device lb.

 Next, the sheet-like waste material flows on the water surface and the non-ferrous waste material that has not been separated by the first non-ferrous waste material sorting device la flows into the second non-ferrous waste material sorting device lb. Water overflowing from the sorting tank 5 of the first non-ferrous waste sorting device la is received into the sorting tank 5 of the second non-ferrous waste sorting device lb and the third non-ferrous waste sorting device lc in an amount of 1Z2 each, and overflows at the same time. Is done. Furthermore, the flow on the water surface is maintained by adjusting the strength of the inclined water flow by the variable wing 8 and the water flow by the sorting screen unit 7, and the continuous overflow described above, and the sheet-like waste material flows over the water surface to the end and is collected. .

 Further, in the second non-ferrous waste sorting device lb, the particle size of the granular material 73 is set smaller than that of the first non-ferrous waste sorting device 1a. The water that has passed through the sorting screen 7 is made more uniform. Due to the uniformized water pulsation, the non-ferrous waste material forms a sedimentary layer on the sorting screen section 7 which is sorted by the specific gravity difference. In the second non-ferrous waste sorter lb, substrate debris, such as copper sandwiched between resins, settled in the bottom layer. The lowermost non-ferrous waste material is separated by the rotary feeder 9 and sequentially collected. The other waste material in the upper layer passes over the recovery port 13 and flows out to the third non-ferrous waste material sorting device lc.

Next, in the third non-ferrous waste sorting device lc, the sheet-like waste flows through the water surface of the first non-ferrous waste sorting device la and the second non-ferrous waste sorting device lb, and the second non-ferrous waste sorting device lc. The non-ferrous waste that has not been recovered by the lb will flow. Like the second non-ferrous waste sorting device lb, the third non-ferrous waste sorting device lc also maintains the water surface flow by adjusting the flow velocity of the sorting screen 7 and sloping water flow by the variable wings 8 and continuous overflow. The material is quickly transported and collected on the water surface without sinking below the water surface or wrapping up other waste materials. On the other hand, on the sorting screen section 7, non-ferrous metals such as stainless steel and aluminum precipitate due to vertical pulsation, and are sequentially collected by the rotary feeder 9. The small non-ferrous materials such as ABS resin, PS, PVC, etc., which are also collected by the third non-ferrous waste sorting device lc, pass over the collection port 13 and are collected together with the sheet-like waste materials. Is done. These lightweight waste materials are further crushed in the lightweight waste material crushing step of step S5, and then conveyed to the lightweight waste material sorting device 4 used in the first lightweight waste material sorting step of step S7 described below, and further finely divided. Be sorted out.

 [0058] Further, suspended matters such as urethane, PE, and PP are separately collected by the side trap S provided in the non-ferrous waste sorting system 2, and are crushed in the suspended matter crushing step of Step S6. , Will be collected.

 [0059] The particle diameter of the granular material 73 and the inclination angle of the variable blade 8 in the third non-ferrous waste material sorting device lc and the second non-ferrous waste material sorting device lb are forces that are equal to each other. It is not something that can be done. If each value in the third non-ferrous waste sorting device lc is equal to or less than the value of the second non-ferrous waste sorting device lb, it is appropriately set according to the type of waste to be sorted.

 [0060] As described above, according to the non-ferrous waste sorting apparatus 1 of the present embodiment,

 1. In addition to being able to sort mixed waste materials based on the specific gravity difference, sorting can be performed in consideration of the shape to improve sorting accuracy.

 2. Since a horizontal flow is generated on the water surface, sheet-like waste materials can be prevented from getting into the water or wrapping up other waste materials, and can be recovered.

 3.By passing through the screening screen 7, the turbulence generated by the shape of the roof 61a of the air chamber 61 can be made uniform, and the flow direction of the flow away from the air chamber 61 can be made orderly. Thus, the mixed waste material can be appropriately pulsated up and down.

 4. Since the descent is stopped intermittently when the water descends, a remarkable disparity is given to the sedimentation speed of the waste materials having different specific gravities, the sorting effect by the specific gravity difference is enhanced, and the sorting processing time can be shortened.

 5. Since the opening / closing operation of the rotary valve 10 is interlocked with the pulsation of the vertical pulsation means 6, it is possible to recover the linear waste material while performing the pulsation.

[0061] According to the non-ferrous waste sorting system 2 of the present embodiment, 1.In order to set the particle size of the granular material 73 as appropriate, in the first sorting tank 5, sorting is performed by the shape of the gap of the granular material 73, and in the subsequent sorting tank 5, the pulsating water is made uniform, Accurate sorting can be performed.

 2. Since all the water overflowing from the first sorting tank 5 is received by the following sorting tank 5, the flow velocity at the part where it is sent to the next sorting tank 5 is large. The water flow in 5 stabilizes. In addition, under the surface of the water, it is possible to prevent the waste material to be sorted which has formed a layer on the sorting screen unit 7 from being disturbed. On the surface of the water, the sheet-like waste material can be smoothly discharged to the next sorting tank 5.

 3. Since the inclination angle of the variable wings 8 is set appropriately, the horizontal flow velocity near the water surface can be maintained up to the final sorting tank 5, and the horizontal flow velocity can be moderated below the water level of the subsequent sorting tank 5. Thus, there is an effect that the pulsation in the vertical direction can be secured.

 [0062] (2) Linear waste material sorting device

 Next, the linear waste material sorting apparatus 3 of the present embodiment used in the linear waste material sorting step of step S4 will be described with reference to FIG. Note that, among the configurations of the linear waste material sorting apparatus 3, the same or corresponding components as those of the above-described non-ferrous waste material sorting apparatus 1 are denoted by the same reference numerals, and the description thereof is omitted.

 [0063] The linear waste material sorting apparatus 3 of the present embodiment mainly includes a sorting tank 5 filled with water, vertical pulsation means 6 for vertically pulsating the water in the sorting tank 5, and a sorting tank 5 in the sorting tank 5. , A linear waste material separation layer 15 in which spherical objects are laid on the separation net 14, and a rotary feeder 9 that collects the waste material that has formed a layer on the linear waste material separation layer 9. And a rotary valve 10 for collecting waste material dropped below the linear waste material separation layer 15.

 [0064] To describe each component of the linear waste material sorting apparatus 3 of the present embodiment in more detail, the partition net 14 is formed in a substantially square shape having substantially the same shape as the cross section of the sorting tank 5 in a plane. It is fixed horizontally above the air chamber 61 in the tank 5. The mesh of the partition net 14 is formed to have a size that allows the linear waste material to drop but does not allow the spherical objects to drop. In the present embodiment, the mesh is formed into a 9 mm mesh.

[0065] Next, the linear waste material separation layer 15 is constituted by spherical objects 15a having a specific gravity smaller than the specific gravity of the linear waste material to be sorted out of the mixed waste materials and having a specific gravity larger than the specific gravity of the remaining other waste materials. It is made. In this embodiment, the stainless steel balls 15a satisfying the condition that the specific gravity is smaller than the copper wire scrap and the specific gravity is larger than the resin are used. The stainless balls 15a are formed with substantially the same weight and shape. In the linear waste material separation layer 15, a plurality of the above-mentioned stainless steel balls 15a are spread on the partition net 14 and laminated in three stages.

 [0066] On the other hand, the sorting tank 5 needs to be formed into a regular polygon such as a substantially square or a circular cross section. This is because the frictional force between the spread spherical object 15a and the wall surface of the sorting tank 5 is substantially equal on each side, so that the linear waste material separation layer 15 moves up and down physically, and only the linear waste material is moved downward. It is to guide to. Therefore, when the sorting tank 5 has a regular polygonal cross section, the length of one side is set to a value (an integer multiple) divisible by the diameter of the spherical object 15a, and as shown in FIG. It is spread so that it contacts. In the present embodiment, a spherical object 15a having a diameter of 10 mm is used for one side of a square cross section of 600 mm.

 [0067] Other than the stainless steel ball 15a, other materials may be used as the spherical material 15a as long as the above conditions are satisfied. Further, in the present embodiment, as a result of trial and error, the force of laminating the spherical objects 15a in three layers is not limited to this.

 Next, a linear waste material sorting process (step S4) using the linear waste material sorting apparatus 3 of the present embodiment will be described.

 First, in step S3 described above, linear waste materials such as copper wire scraps sorted out are introduced from the inlet 11 and fall onto the linear waste material separation layer 15. The linear waste material separation layer 15 moves up and down with the vertical pulsation of water by the vertical pulsation means 6. On the other hand, the sorting tank 5 is formed in a substantially square shape in cross section, and uses the spherical material 15a having the same weight and shape, so that the linear waste material separation layer 15 and the sorting tank 5 are formed. The frictional resistance generated between the wall and the contact surface is almost equal. Thus, the spherical objects 15a constituting the linear waste material separation layer 15 repeat vertical movements almost integrally. As shown in FIG. 8, the linear waste material separation layer 15 has an appropriate gap between the spherical objects 15a, so that copper wire debris having a higher specific gravity than the spherical object 15a gradually descends from the gap. Is finally dropped from the partition net 14 to the outlet.

[0070] The copper wire debris tends to be entangled, so that it may not be able to pass between the spheres 15a as it is, but each sphere 15a of the linear waste material separation layer 15 may move up and down physically to form a lump. Below Push up to loosen the lump and allow it to fall through the gap. In addition, copper wire scraps

A force that may be pulled by the mesh 14 The balls 15a fall off the partitioning net 14 because they repeatedly collide with each other so that the copper wire scraps that are being hooked also push in the upward force. The copper wire scrap sorted and separated as described above is also discharged by the rotary valve 10 at the lowermost force of the sorting tank 5.

 On the other hand, on the linear waste material separation layer 15, among the resin wastes, resin having a large specific gravity (hereinafter referred to as resin A) is laminated in a lower layer due to a difference in specific gravity, and this is collected by the rotary feeder 9. . Other resins having a low specific gravity (hereinafter referred to as “resin B”) are recovered separately through the recovery port 13.

 As described above, according to the linear waste material sorting apparatus 3 of the present embodiment,

 1. It is possible to accurately sort copper wire debris that is difficult to sort due to specific gravity difference

2.By limiting the shape of the sorting tank 5 and the specific gravity, weight and shape of the spherical object 15a, the vertical pulsation of the linear waste material separation layer 15 can be suppressed so as not to be too disturbed, and the entangled copper wire debris can be released. Copper wire debris that has been separated or hooked on the partition net 14 can be separated under the net.

3.The opening and closing operation of the rotary valve 10 is linked with the vertical pulsation of the vertical pulsation means 6 to collect copper wire debris at the time of the exhaust operation of the air chamber 61, so that drainage can be minimized. Play.

 (3) Lightweight waste material sorting device

 Next, the lightweight waste material sorting apparatus 4 of the present embodiment used in the first lightweight waste material sorting step of step S7 will be described with reference to FIG. In the configuration of the lightweight waste material sorting device 4, the same or corresponding components as those of the non-ferrous waste material sorting device 1 and the linear waste material sorting device 3 described above are denoted by the same reference numerals, and are described again. Is omitted.

[0074] The lightweight waste material sorting device 4 of the present embodiment is a device for sorting waste materials that are lightweight waste materials such as resin and are susceptible to pulsation and have a specific gravity difference force. For example, if the specific gravity of a polymer compound is given, PVC is 1.35-1.55, PS is 1.04-1.06, Pama 0.94-0.97, Pama 0.90-0. 91, ABSi or 1.05—1.22! The difference in specific gravity is small because the specific gravity is small. Therefore, the lightweight waste material sorting apparatus 4 mainly includes a sorting tank 5 filled with water. Vertical pulsation means 6 for pulsating the water in the sorting tank 5 in the vertical direction, an inclined sorting screen section 16 for partitioning the inside of the sorting tank 5 up and down, and collecting the waste material formed on the inclined sorting screen section 16 And a rotary feeder 9.

 The components of the lightweight waste material sorting apparatus 4 according to the present embodiment will be described in more detail. The inclined sorting screen section 16 includes a floor net 71 that partitions the inside of the sorting tank 5 up and down, and a floor net 71 above the floor net 71. And a plurality of granular materials 73 stacked in gaps between the ceiling net 16a and the floor net 71. The ceiling net 16a, like the floor net 71, is formed in a substantially square shape having substantially the same shape as the plane cross section of the sorting tank 5, and has a mesh that does not allow the granular material 73 to pass through. Further, as shown in FIG. 9, the ceiling net 16a is inclined downward toward the collection port 13, so that light and lightweight waste materials are slowly transferred to the collection port 13 along the inclined surface. Further, the number of the granular materials 73 is reduced closer to the collection port 13 so that the thickness of the inclined sorting screen section 16 is reduced. This is because, when collecting resin, the higher the lamination thickness near the collection port 13 is, the better the sorting quality is. Near the collection port 13, the strength of the water that pushes up the resin is increased. Such a sorting effect by the inclined sorting screen section 16 is more effectively exerted when the difference in specific gravity is 0.001 or more, more preferably 0.5 or more.

 As shown in FIG. 10, a rotary feeder 9 is provided inside the recovery port 13, and the inclination angle of a tangent drawn from the upper end of the recovery port 13 to the outer periphery of the rotary feeder 9. / 3 force The ceiling net 16a is set to be larger than the inclination angle α of 16a. This is because the rotary feeder 9 collects the inputted lightweight waste material without stagnation. If the inclination angle is reversed, the upper end of the recovery port 13 obstructs the path of the waste material drawn into the rotary feeder 9 and the collected waste material is collected in the sorting tank 5 because the amount of recovered waste material decreases. Waste material accumulates.

[0077] Further, inside the recovery port 13, a force pulsation damping plate 18 is suspended from the lower surface of the outflow plate 17 for discharging waste material to the adjacent sorting tank 5. The pulsation damping plate 18 is for preventing the upper and lower pulsations from propagating into the recovery port 13, and attenuates the amplitude so that the separated and separated lightweight waste material is not ejected even if the pulsation amplitude changes. . The pulsation damping plate 18 is provided on the rotary feeder 9 and is set to an arbitrary length according to the amplitude of the pulsation. For example, if the pulsation cycle is fast, in other words, if the amplitude is small, the length of the pulsation damping plate 18 can be reduced. On the contrary, when the pulsation cycle is slow, in other words, when the amplitude is large, the length of the pulsation damping plate 18 must be increased. The lower end of the pulsation damping plate 18 is set so as to be on a tangent line connecting the collecting rotor 13 and the rotary feeder 9 described above so as not to affect the recovered amount. In addition, the lower end of the pulsation damping plate 18 protrudes below the tangent line! This is to secure a route for the collected waste materials.

 [0078] Further, between the collection port 13 and the pulsation damping plate 18, there is provided a waste material vertical movement suppressing plate 19 for suppressing the width of the collected lightweight waste material moving up and down. The waste material vertical movement suppressing plate 19 is inclined upward in the direction of collection by the rotary feeder 9, and reflects waves transmitted to the collection port 13 to the rotary feeder 9 side. If the waste material vertical movement suppressing plate 19 is inclined downward in the collecting direction, the water that has entered the collecting port 13 is reflected, and the waves attenuated by the pulsation damping plate 18 flow back into the sorting tank 5. . The inclination of the waste material vertical movement suppressing plate 19 is arbitrarily set by vertical pulsation.For example, when the pulsation cycle is fast and the amplitude power S is small, the inclination may be small and close to horizontal, but the pulsation cycle is slow and vibration If the width is large, the slope must be increased.

 Next, a first lightweight waste material sorting step (step S7) using the lightweight waste material sorting apparatus 4 of the present embodiment will be described with reference to FIG.

 [0080] First, in step S3 described above, after sorting, in step S5, crushed lightweight waste materials such as ABS, fat PS, and rubber are put into the inlet 11. . The finely powdered resin from the input lightweight waste material is separately collected in a fine powder recovery section 20, and the remaining resin is supplied to an inclined sorting screen section 16 via a water wheel feeder 12. You. In the sorting tank 5, since the vertical pulsation means 6 pulsates the water in the vertical direction, the pulsation causes the light weight waste material to be sorted by the specific gravity difference.

[0081] The lightweight waste material settling in the lower layer due to the difference in specific gravity is transferred to the collection port 13 side along the inclined surface of the ceiling net 16a while repeatedly moving up and down. Therefore, the light-weight waste material that settles on the input port 11 side is also led to the recovery port 13 and collected evenly. On the other hand, on the inclined sorting screen section 16, the light waste material is stacked thicker on the collection port 13 side.As shown in Fig. 10, the granular material 73 in the sorting screen is stacked thinner on the collection port 13 side. Therefore, the flow velocity of the water passing near the recovery port 13 does not slow down, and the settled waste material is moved up and down uniformly. [0082] In the lowermost layer, PVC and rubbers are precipitated, on which ABS resin is laminated. The PVC and rubber are collected by the rotary feeder 9. In the recovery port 13, the pulsation in the sorting tank 5 propagates, but the pulsation damping plate 18 attenuates the pulsation of the water in the recovery port 13 and the waste material vertical movement suppressing plate 19 moves up and down the lightweight waste material to be recovered. Lightweight waste separated and recovered to reduce movement!回収 Collected with sorting accuracy.

 [0083] Further, in the vicinity of the recovery port 13, when light-weight waste material settling in the lower layer is drawn into the recovery port 13, there is a possibility that the upper-layer light-weight waste material may collapse and mix. 9 gently collects the lightweight waste material in order to reduce the vertical movement width of the lightweight waste material in the collection port 13 and prevents upper layer waste material from being mixed.

 [0084] The collected PVC and rubbers are conveyed to the lightweight waste material sorting device 4 used in the second lightweight waste material sorting step in step S8, and further sorted into PVC and rubbers by this device.

 [0085] Also in the present lightweight waste material sorting apparatus 4, similarly to the non-ferrous waste material sorting apparatus 1 described above, the air in the air chamber 61 is intermittently exhausted when the water in the vertical pulsation cycle of each sorting tank 5 descends. In addition, the amount of exhaust per unit time when the water descends is set to be larger than the amount of air supply per unit time when the water rises, and the force is applied strongly to descend. Therefore, the temporarily suspended water, when descending again, amplifies the sedimentation speed of the waste materials with different specific gravities and further increases the specific gravity disparity.

 [0086] In the lightweight waste material sorting apparatus 4, the granular material 73 in the inclined sorting screen portion 16 is thinly stacked on the collection port 13 side, but the specific gravity of the waste material to be separated is not limited to this. In the case where the difference is 0.5 or less, the inclined sorting screen section 16 laminated with a constant thickness may be used.

 [0087] According to the lightweight waste material sorting apparatus 4 of the present embodiment as described above,

 1. It is possible to accurately sort mixed waste materials such as resin that are lightweight and have a small specific gravity difference by gentle vertical pulsation.

2. By inclining the ceiling net 16a, it is possible to reliably collect light-weight waste material that settles on the input port 11 side, and it is possible to increase the sorting quality by stacking thick light-weight waste material on the collection port 13 side. Monkey 3. The environment in the collection port 13 can be maintained gently, and the effects of preventing the once collected light-weight waste material from flowing back and breaking the sedimentary layer can be prevented.

[0088] As described above, according to the mixed waste material sorting step of the present embodiment, a wide variety of mixed waste materials having different specific gravities and shapes can be accurately separated and collected.

[0089] The lightweight waste material sorting apparatus 4 according to the present invention is not limited to the above-described embodiment, and can be appropriately changed.

For example, in the present embodiment, two lightweight waste material sorting devices 4 are connected in series, but the present invention is not limited to this, and may be increased or decreased according to the number of types of mixed waste materials to be sorted.

[0091] Further, in the present embodiment, the water is used for the selection based on the specific gravity difference, but is not limited thereto.

When the object to be sorted is a light material, salt water may be used.

 Brief Description of Drawings

 FIG. 1 is a flowchart showing a mixed waste material sorting step to which a lightweight waste material sorting apparatus according to the present invention is applied.

 FIG. 2 is a schematic diagram showing an embodiment of a non-ferrous waste sorting system including the non-ferrous waste sorting apparatus according to the embodiment.

 FIG. 3 is a graph showing the relationship between the amount of air in the air chamber and the time when air is supplied and exhausted by the upper and lower pulsating means of the present embodiment.

 FIG. 4 is a plan view of a sorting screen unit of the embodiment.

 FIG. 5 is an enlarged schematic diagram showing a non-ferrous waste material sorting apparatus of the present embodiment.

 FIG. 6 is a plan view showing a relationship between a sorting tank of each non-ferrous waste material sorting apparatus of the present embodiment.

 FIG. 7 is a schematic view of a linear waste material sorting apparatus according to the present embodiment.

 FIG. 8 is a plan view of a linear waste material separation tank of the present embodiment.

 FIG. 9 is a schematic diagram of a lightweight waste material sorting apparatus according to the present embodiment.

 FIG. 10 is an enlarged schematic view showing the lightweight waste material sorting apparatus of the present embodiment.

 Explanation of symbols

[0093] 1, la, lb, lc Nonferrous waste sorting equipment

 2 Non-ferrous waste sorting system

3 Linear waste sorting equipment Lightweight waste sorting equipment, 5a, 5b, 5c sorting tank Vertical pulsation means

 Sorting screen section Variable wing

 Rotary feeder

0 Rotary valve

1 Input port

2 Water wheel feeder

3 Collection port

 Partition net

5 Linear waste material separation layer 5a Spherical material (stainless steel ball) 6 Inclined screen 6a Ceiling net

7 Outflow plate

 Pulsation damping plate

9 Waste material vertical movement suppression plate Fine powder recovery section

1 air chamber

1a roof

 Supply / exhaust PI

 Air blower

 Air valve

 Air tank Nore motor

1 floor net

Partition wall 73 Granular material 91 Recovery vane S Side trap

Claims

The scope of the claims  [1] a sorting tank for sorting lightweight waste materials in liquid according to their specific gravity differences,  Vertical pulsation means having an air chamber for pulsating the liquid in the sorting tank in the vertical direction; a floor net dividing the inside of the sorting tank up and down; a ceiling disposed above the floor net and descending to the collection port side; A net, and an inclined sorting screen section provided with a number of granular materials in which a collecting port side is thinner than an input port side in a gap between the floor net and the ceiling net, and a sorted waste material arranged in the collecting port. And a rotary feeder to collect  Has,  A lightweight waste material sorting apparatus, wherein an inclination angle of a straight line connecting the collection port and an upper end of the rotary feeder is set to be equal to or greater than an inclination angle of the ceiling net.  [2] The rotary pulsation attenuating plate according to claim 1, wherein the pulsation damping plate is formed to have an arbitrary length in accordance with the amplitude of the pulsation in order to attenuate vertical pulsation propagating from the inside of the sorting tank into the collection port. A lightweight waste material sorting device that is suspended above the feeder.  [3] In claim 2, in order to reduce the vertical movement width of the waste material recovered in the recovery port, a waste material vertical movement suppressing plate inclined upward in the recovery direction is provided between the recovery port and the pulsation damping plate. A lightweight waste material sorting device, which is provided in  [4] In claim 1, the vertical pulsation means intermittently exhausts air in the air chamber when the liquid descends in a vertical pulsation cycle in order to increase a difference in settling speed of the lightweight waste material. A light-weight waste material sorting apparatus characterized in that the displacement per unit time is made larger than the supply per unit time when the liquid rises.  [5] A sorting tank for sorting mixed waste materials in liquid according to the difference in specific gravity, vertical pulsation means having an air chamber for vertically pulsating the liquid in the sorting tank, and a screen for vertically separating the sorting tank A method for sorting mixed waste material in a mixed waste material sorting device having a section, wherein the air in the air chamber is intermittently exhausted when the liquid descends in a vertical pulsation cycle in order to increase the difference in settling speed of the mixed waste material. A method for sorting mixed waste materials, wherein the amount of exhaust air per unit time is made larger than the amount of air supply per unit time when the liquid rises.