Waste treatment equipment and waste treatment method

Abstract

Provided is a waste treatment device that more efficiently recovers valuable metals from waste than in the prior art. 【Solution means】An eccentric eddy current separator for separating valuable metals from the first waste is provided. The eddy current separator includes a conveyor belt for conveying the first waste, a conveyor head pulley and a conveyor tail pulley for rotating the conveyor belt, and a magnet drum disposed in the conveyor head pulley for generating a magnetic field on the conveying surface of the conveyor belt. The rotational speed of the rotatable magnet drum is more than 3000 rpm and less than 4000 rpm, and the valuable metal includes one or more selected from the group consisting of gold, silver, copper, palladium, and platinum. Waste treatment device.

Description

Technical Field

[0005] , , , ,

[0001] The present invention relates to a waste treatment apparatus and a waste treatment method.

Background Art

[0002] Conventionally, waste such as municipal waste has been incinerated, and the incineration ash generated by incineration has been landfilled at a landfill site. In recent years, in view of the possible depletion of landfill sites, studies have been made on the effective utilization of incineration ash. In particular, techniques for recovering valuable metals such as gold, silver, copper, palladium, and platinum from incineration ash have been studied.

[0003] For example, in Patent Document 1, for the purpose of efficiently recovering precious metals from incineration ash, a crushing device or / and a classification device that crushes or classifies the incineration ash to a maximum particle size of 5 mm or less or both, and an eddy current separator that separates the incineration ash with a maximum particle size of 5 mm or less discharged from the crushing device or / and the classification device into a conductor and a non-conductor, and a specific gravity difference separator that separates the conductor discharged from the eddy current separator into a high specific gravity material and a low specific gravity material are provided. A waste treatment apparatus for incineration ash is described.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in conventional techniques including Patent Document 1, there is still room for improvement in efficiently recovering valuable metals from waste such as incineration ash. An object of the present invention is to provide a waste treatment apparatus and a waste treatment method for more efficiently recovering valuable metals from waste than in the prior art.

Means for Solving the Problems

[0006] As a result of diligent research to achieve the above objective, the inventors of this invention have discovered that valuable metals can be recovered more efficiently from waste by using a waste treatment device equipped with a specific sorting machine that can be operated under specific conditions, and have completed this invention.

[0007] In other words, the present invention is as follows. [1] A waste treatment apparatus comprising an eccentric eddy current separator for separating valuable metals from a first waste, wherein the eddy current separator comprises a conveyor belt for transporting the first waste, a conveyor head pulley and a conveyor tail pulley for rotating the conveyor belt, and a magnetic drum disposed in the conveyor head pulley for generating a magnetic field on the transport surface of the conveyor belt, wherein the rotational speed of the rotatable magnetic drum is more than 3000 rpm and less than 4000 rpm, and the valuable metals include one or more selected from the group consisting of gold, silver, copper, palladium and platinum. [2] The waste treatment apparatus described above, wherein the size of the first waste is 20 mm or less. [3] The waste treatment apparatus described above, wherein the size of the first waste is 4 mm or less. [4] The waste treatment apparatus described above, wherein the magnet drum is eccentric with respect to the axis of the conveyor head pulley, and has an axis having a positive eccentric angle in the rotational direction of the conveyor head pulley when the direction perpendicular to the axis of the conveyor head pulley is taken as 0°, and the positive eccentric angle is 0° or more and 20° or less. [5] The waste treatment apparatus described above, wherein the conveying speed of the conveyor belt for transporting the first waste is 1.5 m / s or more and 2.5 m / s or less. [6] The waste treatment apparatus described above, wherein the number of pairs of NS magnetic poles in the magnetic drum is 36 or more and 44 or less. [7] The waste treatment apparatus comprising a magnetic separator for separating and removing at least a portion of iron from the waste to obtain the first waste. [8] The waste treatment apparatus comprising a stirrer on the waste transport path, wherein the waste is agitated as it passes through the stirrer. [9] A waste treatment method comprising an eddy current separation step for separating valuable metals from a first waste using an eccentric eddy current separator, wherein the eddy current separator comprises a conveyor belt for transporting the first waste, a conveyor head pulley and a conveyor tail pulley for rotating the conveyor belt, and a magnetic drum disposed in the conveyor head pulley for generating a magnetic field on the transport surface of the conveyor belt, wherein the rotational speed of the rotatable magnetic drum is more than 3000 rpm and less than 4000 rpm, and the valuable metals include one or more selected from the group consisting of gold, silver, copper, palladium and platinum.

[10] The waste disposal method described above, wherein the size of the first waste is 20 mm or less.

[11] The waste disposal method described above, wherein the size of the first waste is 4 mm or less.

[12] The above-described waste disposal method, wherein the magnet drum is eccentric with respect to the axis of the conveyor head pulley, and has an axis having a positive eccentric angle in the rotational direction of the conveyor head pulley when the direction perpendicular to the axis of the conveyor head pulley is taken as 0°, and the positive eccentric angle is 0° or more and 20° or less.

[13] The waste disposal method described above, wherein the conveying speed of the conveyor belt for transporting the first waste is 1.5 m / s or more and 2.5 m / s or less.

[14] The waste disposal method described above, wherein the number of pairs of NS magnetic poles in the magnetic drum is 36 or more and 44 or less.

[15] The waste treatment apparatus described above, comprising a magnetic separation step of separating and removing at least a portion of iron from the waste using a magnetic separator to obtain the first waste.

[16] The waste treatment apparatus comprising a stirring step of stirring the waste by an agitator provided on the waste transport path as the waste passes through the agitator, wherein the waste is waste before at least a portion of the iron is separated and removed to obtain the first waste. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a waste treatment apparatus and a waste treatment method that recover valuable metals from waste more efficiently than conventional methods. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram showing the configuration of a waste treatment system. [Figure 2] This is a schematic diagram illustrating in detail an eccentric eddy current separator, a magnetic separator, and an agitator. [Figure 3] This is a schematic diagram to further explain the eccentric eddy current separator. [Figure 4] This is a schematic diagram to explain the agitator in detail. [Figure 5] This is a schematic diagram illustrating the magnetic drum installed in an eddy current separator. [Modes for carrying out the invention]

[0010] The following describes in detail embodiments for carrying out the present invention (hereinafter simply referred to as "this embodiment"), with reference to the drawings as necessary. However, the present invention is not limited to the embodiments described below. The present invention can be modified in various ways without departing from its essence. In the drawings, the same elements are denoted by the same reference numerals, and redundant explanations are omitted. Furthermore, unless otherwise specified, positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings. Moreover, the dimensional ratios in the drawings are not limited to those shown.

[0011] The waste treatment apparatus of this embodiment includes an eccentric eddy current separator (hereinafter referred to as the "eccentric eddy current separator") for separating valuable metals from a first waste, the eddy current separator comprising a conveyor belt for transporting the first waste, a conveyor head pulley and a conveyor tail pulley for rotating the conveyor belt, and a magnetic drum disposed in the conveyor head pulley for generating a magnetic field on the transport surface of the conveyor belt, wherein the rotational speed of the rotatable magnetic drum is greater than 3000 rpm and less than 4000 rpm, and the valuable metals include one or more selected from the group consisting of gold, silver, copper, palladium, and platinum. Furthermore, the waste treatment method of this embodiment includes an eddy current separation step for separating valuable metals from the first waste using an eccentric eddy current separator, the eddy current separator comprising a conveyor belt for transporting the first waste, a conveyor head pulley and a conveyor tail pulley for rotating the conveyor belt, and a magnetic drum disposed in the conveyor head pulley for generating a magnetic field on the transport surface of the conveyor belt, wherein the rotational speed of the rotatable magnetic drum is greater than 3000 rpm and less than 4000 rpm, and the valuable metals include one or more selected from the group consisting of gold, silver, copper, palladium, and platinum.

[0012] The waste treatment apparatus and waste treatment method of this embodiment can efficiently recover valuable metals, including one or more selected from the group consisting of gold, silver, copper, palladium, and platinum, from the first waste. Compared to a concentric eddy current separator, the eccentric eddy current separator can concentrate a strong magnetic field on the first waste at the optimal position from which the first waste flows through the separator. This generates a stronger repulsive force on the valuable metals, increasing the distance they travel. Furthermore, by having the rotation speed of the magnetic drum be between 3000 rpm and 4000 rpm, the valuable metals that have generated a strong repulsive force can be more clearly separated from other substances contained in the first waste (hereinafter referred to as "residual substances"). These factors combined make it possible to recover valuable metals from the first waste more efficiently.

[0013] FIG. 1 is a schematic diagram showing the configuration of one aspect of the waste treatment apparatus of the present embodiment. The waste treatment apparatus of the present aspect includes at least an eccentric eddy current separator 130 (hereinafter simply referred to as "eddy current separator 130"), but may include at least one of a magnetic separator 110 and a stirrer 120, and may further include a pretreatment apparatus 102. FIG. 2 is a schematic diagram for explaining the eddy current separator 130, the magnetic separator 110, and the stirrer 120 in FIG. 1 in more detail. FIG. 3 is a schematic diagram for explaining the eddy current separator 130 in more detail. FIG. 4 is a schematic diagram for explaining the stirrer 120 in more detail, and FIG. 5 is a schematic diagram for explaining a magnet drum 134 provided in the eddy current separator 130. The waste treatment apparatus will be described while referring to these figures.

[0014] The waste treatment apparatus of the present aspect includes an eddy current separator 130 that separates valuable metals S18 from the first waste S14. As shown in FIG. 3, the eddy current separator 130 includes, for example, a conveyor belt 132 that conveys the first waste S14, a conveyor head pulley 136 and a conveyor tail pulley 131 that rotate the conveyor belt 132 so as to convey the first waste S14, a magnet drum 134 disposed in the conveyor head pulley 136 and generating a magnetic field on the conveying surface of the conveyor belt 132, a container 135 provided below the conveyor belt 132 for accommodating a separated substance mainly containing valuable metals S18 that exhibits a repulsive action against the magnetic field generated by the magnet drum 134, a container 137 for accommodating a non-separated substance mainly containing a residue substance S16 that is a substance other than the valuable metals S18, and a partition plate 138 provided above the container 135 and the container 137.

[0015] In the eddy current separator 130, the diameter of the magnet drum 134 is smaller than the diameter of the conveyor head pulley 136, and the positions of the axis core 134C of the magnet drum 134 and the axis core 136C of the conveyor head pulley 136 are different from each other.

[0016] As shown in Fig. 3, the axis 134C of the magnet drum 134 is eccentric by a distance d compared to the axis 136C of the conveyor head pulley 136. Taking the perpendicular direction passing through the axis 136C of the conveyor head pulley 136 as 0°, it is eccentric so as to have a positive eccentricity angle θ in the rotation direction of the conveyor head pulley 136. It is preferable that the axis 134C of the magnet drum 134 is eccentric with respect to the axis 136C of the conveyor head pulley 136 at an eccentricity angle θ of 0° or more and 20° or less in the rotation direction of the conveyor head pulley 136. Thereby, the valuable metal S18 that generates a strong repulsive force can be appropriately thrown forward and upward in its conveying direction, so that the valuable metal S18 and the residue S16 can be sorted more efficiently and reliably.

[0017] As shown in Fig. 5 for example, the magnet drum 134 has a plurality of pairs of NS magnets M. The number of pairs of NS magnets M may be 36 or more and 44 or less, and among this range, 44 is particularly preferable. Thereby, the valuable metal S18 and the residue S16 can be sorted more efficiently and reliably. In Fig. 5, the number of pairs of NS magnets M is 44.

[0018] The conveying speed of the conveyor belt 132 for conveying the first waste S14 is not particularly limited and may be appropriately set according to the type and size of the substances contained in the first waste S14, the type of valuable metal to be sorted, etc. From such a perspective, the conveying speed of the conveyor belt 132 may be 1.0 m / s or more and 3.0 m / s or less, and it is preferable that it is 1.5 m / s or more and 2.5 m / s or less.

[0019] The rotational speed of the magnet drum 134 is more than 3000 rpm and less than 4000 rpm. When the rotational speed of the magnet drum 134 is within the above range, the content of the valuable metal S18 contained in the sorted substances can be increased, and the content of the valuable metal S18 mixed into the residue S16 can be reduced. As a result, the valuable metal S18 can be recovered sufficiently efficiently. From the same perspective, the rotational speed of the magnet drum 134 may also be more than 3000 rpm and 3850 rpm or less.

[0020] The magnetic force of the magnetic drum 134 is not particularly limited and can be set as appropriate.

[0021] Preferably, the partition plate 138 is positioned above containers 135 and 137. The valuable metal S18 and residual material S16 fall after detaching from the conveyor belt 132 and are contained in containers 135 or 137. However, depending on the state of the first waste S14 that is introduced (for example, the type and ratio of constituent materials, the leveling state of the waste on the conveyor belt, and the amount of residual material S16 adhering to the valuable metal S18, etc.), the falling trajectory of the valuable metal S18 and residual material S16 may not always be constant and may vary. As a result, there is a risk that the valuable metal S18 may be contained in container 137, or the residual material S16 may be contained in container 135 in an amount exceeding the desired amount. Therefore, the partition plate 138 is installed above containers 135 and 137 to separate the falling area after passing through the partition plate 138 into containers 135 and 137. This makes it possible to further improve the separation efficiency between the valuable metal S18 and the residue S16. The shape, position, and dimensions of the partition plate 138 are not particularly limited and should be set appropriately according to the amount, type, and dimensions of the first waste S14 to be processed, and the valuable metal S18 and residue S16 to be separated, so as to ensure efficient separation of the valuable metal S18 and the residue S16.

[0022] The first waste S14 supplied to the eddy current separator 130 is not particularly limited as long as it contains valuable metals S18 and residual material S16. If the waste treatment device includes both the pretreatment device 102 described later and the magnetic separator 110 described later, the first waste S14 may be obtained by further processing the second waste S12, which is obtained by processing the waste S10 introduced into the waste treatment device with the pretreatment device 102, with the magnetic separator 110. Furthermore, the first waste S14 and the second waste S12 may be obtained from manufacturers of various types of waste. Here, the valuable metal is one or more selected from the group consisting of gold, silver, copper, palladium, and platinum. Examples of waste include incinerator ash, construction waste soil, scrapped automobiles, and shredder dust generated by crushing scrapped home appliances. Examples of incinerated ash include ash obtained by incinerating municipal solid waste and industrial waste. Specifically, this includes industrial waste such as sludge, waste plastics, metal scraps, glass scraps, concrete scraps, ceramic scraps, slag, and rubble, as well as ash obtained by incinerating shredder dust and general waste. Examples of construction-generated soil include soil and sludge generated as by-products of construction and civil engineering work. The waste may be a single type of waste or a mixed waste consisting of multiple types of waste. Among the waste, preferred materials in this embodiment include, for example, positive electrode material, negative electrode material, PTP sheet, aluminum laminate, and aluminum pouch derived from waste batteries. When the waste is incinerated ash, the incinerated ash may be bottom ash, fall ash, or a mixture thereof.

[0023] Furthermore, if the waste treatment device is equipped with a pretreatment device 102 but not a magnetic separator 110, the second waste S12 and the first waste S14 will be substantially the same, so the second waste S12 may be referred to as the first waste S14. Also, if the waste treatment device is equipped with a magnetic separator 110 but not a pretreatment device 102, the waste S10 and the second waste S12 will be substantially the same, so the waste S10 may be referred to as the second waste S12. Moreover, if the waste treatment device is not equipped with a pretreatment device 102 and a magnetic separator 110, the waste S10, the second waste S12, and the first waste S14 will be substantially the same, so the waste S10 and the second waste S12 may be referred to as the first waste S14.

[0024] The size of the first waste S14 is preferably 20 mm or less, may be 15 mm or less, more preferably 8 mm or less, and even more preferably 4 mm or less. This allows for a higher content of valuable metal S18 in the first waste S14. Furthermore, the size of the first waste S14 can be made more uniform compared to cases where waste exceeding the above range is included. As a result, it becomes possible to separate the valuable metal S18 from the first waste S14 more efficiently. The size of the first waste can be adjusted by appropriately selecting the mesh size in the sieving machine described later. For example, to obtain first waste having a size of 4 mm or less, the mesh size on the 3D screen can be set to 4 mm.

[0025] The waste treatment device preferably includes a magnetic separator 110 that separates and removes at least a portion of the iron from the second waste S12 to obtain the first waste S14. This reduces the amount of iron contained in the first waste S14 supplied to the eddy current separator 130. For example, in Figure 2, the iron separated and removed by the magnetic separator 110 is collected in a container 139. The iron is contained in the residue S16, and by reducing this amount beforehand, the separation efficiency of the valuable metal S18 and the residue S16 in the eddy current separator 130 can be further improved.

[0026] The magnetic separator 110 may be a conventionally known type, a stationary magnetic separator as schematically shown in Figure 2, or a suspended magnetic separator. In Figure 2, the second waste S12 is transported by the conveyor belt 140 and supplied to the magnetic separator 110.

[0027] The waste treatment device preferably includes one or more agitators 120, as shown in Figure 2. The agitator 120 agitates the first waste S14 or the second waste S12 placed on a conveyor belt. The conveyor belt here may be the conveyor belt 132 provided in the eddy current separator 130, the conveyor belt provided in the magnetic separator 110, or a conveyor belt provided further upstream (for example, conveyor belt 140). By agitating the waste S10, the first waste S14, or the second waste S12 with the agitator 120, the aggregation and mating of valuable metals S18 and residual substances S16 contained in the waste can be loosened and leveled. As a result, the valuable metals S18 and residual substances S16 become easier to separate in the subsequent eddy current separator 130 or magnetic separator 110. The agitator 120 can be installed at any location along the waste transport path that allows for the agitation of the waste. Furthermore, although Figure 2 shows three agitators 120, only one or two of these agitators 120 may be installed.

[0028] The structure of the agitator 120 is not particularly limited and can be any agitator capable of agitating the first waste S14 or the second waste S12, for example, the agitator 120 shown in Figure 4. Furthermore, the agitator 120 may be fixed to the waste treatment device and agitate the waste S10, the first waste S14, or the second waste S12 as they move and pass through the agitator 120 while placed on the conveyor belt.

[0029] In Figure 4, the agitator 120 has a flat plate 124 that is almost parallel to the conveying surface of the conveyor belt 112, multiple agitation rods 126 that are provided so as to protrude below the flat plate 124 and are positioned offset from the center of the flat plate, and a rotating shaft 122 that is provided so as to discharge upward from the center of the flat plate 124 and is capable of rotating the flat plate 124. As the flat plate 124 rotates around the rotating shaft 122, the multiple agitation rods 126 move in various directions above the conveying surface, and the second waste S12 is agitated by these agitation rods 126. As a result, as described above, the aggregation and mating of valuable metals S18 and residual substances S16 contained in the second waste S12 can be loosened and leveled, making it easier to separate the valuable metals and residual substances S16 in the magnetic separator 110 or eddy current separator 130.

[0030] The second waste S12 or the first waste S14 may be obtained by processing waste S10 in the pre-treatment device 102. The pre-treatment device 102 may be a combination of a conveyor belt for transporting waste S10 and waste obtained by further processing waste S10 (hereinafter simply referred to as "waste"), a magnetic separator for separating and removing iron from the waste (however, this is a different magnetic separator from the magnetic separator 110 described above), a concentric eddy current separator for separating non-ferrous metals from the waste, a sieving machine such as a 3D screen for standardizing the size of the waste to a certain range, and a crusher for crushing the waste to a desired degree. By processing waste S10 in the pre-treatment device 102, for example, a second waste S12 or the first waste S14 having a size of 20 mm or less, 15 mm or less, 8 mm or less, or 4 mm or less can be obtained.

[0031] One aspect of the waste treatment method of this embodiment is a waste treatment method using the waste treatment apparatus described above with reference to Figures 1 to 5. More specifically, the waste treatment method of this embodiment includes an eddy current separation step in which valuable metals S18 are separated from a first waste S14 using an eddy current separator 130, wherein the rotational speed of the rotatable magnetic drum 134 provided in the eddy current separator 130 is greater than 3000 rpm and less than 4000 rpm, and the valuable metals S18 include one or more selected from the group consisting of gold, silver, copper, palladium, and platinum.

[0032] The waste treatment method of this embodiment preferably includes a magnetic separation step in which at least a portion of the iron is separated from the second waste S12 by a magnetic separator 110 to obtain the first waste S14. Furthermore, the waste treatment method of this embodiment preferably includes a stirring step in which the waste is stirred by a stirrer 120 as it passes through a stirrer provided on the waste transport path. In addition, the waste treatment method of this embodiment may include a pretreatment step in which the waste S10 is treated by a pretreatment device 102 to obtain the second waste S12 or the first waste S14. The advantages of each step are clear from the above description of the waste treatment device, so a further explanation is omitted here. [Industrial applicability]

[0033] According to the waste treatment apparatus and waste treatment method of the present invention, valuable metals can be recovered from waste more efficiently than in conventional methods. Therefore, there is potential for industrial application in fields such as recovering valuable metals from ash generated when waste such as municipal solid waste is incinerated in an incinerator, or in utilizing the recovered valuable metals. [Explanation of Symbols]

[0034] 102...Pre-treatment device, 110...Magnetic separator, 120...Agitator, 130...Eccentric eddy current separator, 138...Partition plate, S10...Waste, S12...Second waste, S14...First waste, S18...Valuable metals.

Claims

1. An eccentric eddy current separator for separating a sorting material from a first waste containing valuable metals and a non-sorting material which is a substance other than the sorting material, The sorted material and the unsorted material each contain the valuable metal, The eddy current separator comprises a conveyor belt for transporting the first waste, a conveyor head pulley and a conveyor tail pulley for rotating the conveyor belt, and a magnet drum disposed within the conveyor head pulley for generating a magnetic field on the conveying surface of the conveyor belt. The magnet drum is eccentric with respect to the axis of the conveyor head pulley. The rotational speed of the rotatable magnet drum is greater than 3000 rpm and less than 4000 rpm. The number of pairs of N and S magnetic poles in the aforementioned magnetic drum is 36 or more and 44 or less. A waste treatment apparatus in which the aforementioned valuable metal includes one or more selected from the group consisting of gold, silver, copper, palladium, and platinum.

2. The waste treatment apparatus according to claim 1, wherein the size of the first waste is 20 mm or less.

3. The waste treatment apparatus according to claim 1 or 2, wherein the conveyor head pulley has an axis having a positive eccentricity angle in the rotational direction when the direction perpendicular to the axis passing through the axis of the conveyor head pulley is defined as 0°, and the positive eccentricity angle is 0° or more and 20° or less.

4. The waste treatment apparatus according to claim 1 or 2, wherein the conveying speed of the conveyor belt for transporting the first waste is 1.5 m / s or more and 2.5 m / s or less.

5. The waste treatment apparatus according to claim 1 or 2, comprising a magnetic separator that separates and removes at least a portion of iron from the waste to obtain the first waste.

6. The eddy current separator is equipped with an agitator on the waste transport path, and the waste may be the first waste. The waste treatment apparatus according to claim 1 or 2, wherein the agitator comprises a flat plate substantially parallel to the conveying surface of a conveyor belt for transporting the waste, a plurality of agitating rods provided so as to protrude below the flat plate and positioned offset from the center of the flat plate, and a rotating shaft provided so as to protrude above the center of the flat plate and capable of rotating the flat plate.

7. The waste treatment apparatus according to claim 1 or 2, further comprising a partition plate for separating the sorted material and the unsorted material that fall after being removed from the conveyor belt.

8. The system includes an eddy current separation process in which an eccentric eddy current separator separates a first waste containing valuable metals from a sorted material and a non-sorted material which is a material other than the sorted material. The sorted material and the unsorted material each contain the valuable metal, The eddy current separator comprises a conveyor belt for transporting the first waste, a conveyor head pulley and a conveyor tail pulley for rotating the conveyor belt, and a magnet drum disposed within the conveyor head pulley for generating a magnetic field on the conveying surface of the conveyor belt. The magnet drum is eccentric with respect to the axis of the conveyor head pulley. The rotational speed of the rotatable magnet drum is greater than 3000 rpm and less than 4000 rpm. The number of pairs of N and S magnetic poles in the aforementioned magnetic drum is 36 or more and 44 or less. A waste disposal method wherein the aforementioned valuable metal includes one or more selected from the group consisting of gold, silver, copper, palladium, and platinum.

9. The waste disposal method according to claim 8, wherein the size of the first waste is 20 mm or less.

10. The waste disposal method according to claim 8 or 9, wherein the conveyor head pulley has an axis having a positive eccentricity angle in the rotational direction when the direction perpendicular to the axis passing through the axis of the conveyor head pulley is defined as 0°, and the positive eccentricity angle is 0° or more and 20° or less.

11. The waste disposal method according to claim 8 or 9, wherein the conveying speed of the conveyor belt for transporting the first waste is 1.5 m / s or more and 2.5 m / s or less.

12. The waste treatment method according to claim 8 or 9, comprising a magnetic separation step of separating and removing at least a portion of iron from the waste using a magnetic separator to obtain the first waste.

13. The system comprises a stirring step in which the waste is stirred by an agitator provided on the waste transport path as the waste passes through the agitator, wherein the waste may be the first waste, The waste disposal method according to claim 8 or 9, wherein the agitator comprises a flat plate substantially parallel to the conveying surface of a conveyor belt for transporting the waste, a plurality of agitating rods provided so as to protrude below the flat plate and positioned offset from the center of the flat plate, and a rotating shaft provided so as to protrude above the center of the flat plate and capable of rotating the flat plate.

14. The waste disposal method according to claim 8 or 9, further comprising a partition plate for separating the sorted material and the unsorted material that fall after being removed from the conveyor belt.

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