Waste treatment apparatus and waste treatment method

Abstract

To provide a waste treatment apparatus which recovers valuable metals from waste more efficiently than before.SOLUTION: An eddy-current separator that separates valuable metals from the first wastes, the eddy-current separator including a conveyer belt that conveys the first wastes, conveyer head pulleys and conveyer tail pulleys that rotate the conveyer belt, and a magnet drum that is disposed in the conveyer head pulleys and generates a magnetic field on a conveyance surface on the conveyer belt, a rotation speed of the rotatable magnet drum being less than a 3000rpm super 4000rpm, and the valuable metals including one or more selected from the group consisting of gold, silver, copper, palladium, and platinum.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a waste treatment device and a waste treatment method. [Background technology]

[0002] Conventionally, waste such as municipal solid waste has been incinerated, and the ash generated by the incineration has been disposed of in landfills. In recent years, in view of the risk of landfills becoming depleted, effective utilization of the ash has been studied. In particular, technologies for recovering valuable metals such as gold, silver, copper, palladium, and platinum from the ash have been studied.

[0003] For example, Patent Document 1 describes an incineration ash treatment device that aims to efficiently recover precious metals from incineration ash, and is characterized by comprising a crushing device and / or a classifying device that crushes and / or classifies the incineration ash into particles with a maximum particle size of 5 mm or less, an eddy current sorting device that separates the incineration ash with a maximum particle size of 5 mm or less discharged from the crushing device and / or classifying device into conductors and non-conductors, and a specific gravity difference sorting device that separates the conductors discharged from the eddy current sorting device into high specific gravity and low specific gravity materials. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-58059 Summary of the Invention [Problem to be solved by the invention]

[0005] However, conventional techniques such as those described in Patent Document 1 still have room for improvement in terms of efficiently recovering valuable metals from waste such as incineration ash. An object of the present invention is to provide a waste treatment device and a waste treatment method that recover valuable metals from waste more efficiently than conventional methods. [Means for solving the problem]

[0006] As a result of extensive research conducted by the inventors in order to achieve the above-mentioned object, they 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 thus completed the present invention.

[0007] That is, the present invention is as follows. [1] A waste treatment device comprising an eccentric eddy current separator for separating valuable metals from primary waste, the eddy current separator comprising a conveyor belt for transporting the primary waste, a conveyor head pulley and a conveyor tail pulley for rotating the conveyor belt, and a magnetic drum disposed within the conveyor head pulley for generating a magnetic field on the conveying surface of the conveyor belt, the rotation speed of the rotatable magnetic drum being greater than 3000 rpm and less than 4000 rpm, and the valuable metals including one or more selected from the group consisting of gold, silver, copper, palladium, and platinum. [2] The above waste treatment device, wherein the size of the first waste is 20 mm or less. [3] The above waste treatment device, wherein the size of the first waste is 4 mm or less. [4] The above-mentioned waste treatment device, wherein the magnetic drum is eccentric relative to the axis of the conveyor head pulley, and has an axis that has a positive eccentric angle in the rotation direction of the conveyor head pulley when the perpendicular direction passing through the axis of the conveyor head pulley is set to 0°, and the positive eccentric angle is between 0° and 20°. [5] The waste treatment device as described above, wherein the conveying speed of the conveyor belt that conveys the first waste is 1.5 m / s or more and 2.5 m / s or less. [6] The above waste treatment device, wherein the number of pairs of N-S magnetic poles in the magnetic drum is 36 or more and 44 or less. [7] The above waste treatment device, further comprising a magnetic separator that selectively removes at least a portion of iron from the waste to obtain the first waste. [8] The above waste treatment device, which is provided with an agitator on the waste transport path, and the waste is agitated as it passes through the agitator. [9] A waste treatment method comprising an eddy current separation process for separating valuable metals from primary waste using an eccentric eddy current separator, the eddy current separator comprising a conveyor belt for transporting the primary waste, a conveyor head pulley and a conveyor tail pulley for rotating the conveyor belt, and a magnetic drum disposed within the conveyor head pulley for generating a magnetic field on the conveying surface of the conveyor belt, the rotation speed of the rotatable magnetic drum being greater than 3000 rpm and less than 4000 rpm, and the valuable metals including one or more metals selected from the group consisting of gold, silver, copper, palladium, and platinum.

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

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

[12] The above waste treatment method, wherein the magnetic drum is eccentric relative to the axis of the conveyor head pulley, and has an axis that has a positive eccentric angle in the rotation direction of the conveyor head pulley when the perpendicular direction passing through the axis of the conveyor head pulley is set to 0°, and the positive eccentric angle is between 0° and 20°.

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

[14] The above waste treatment method, wherein the number of pairs of N-S magnetic poles in the magnetic drum is 36 or more and 44 or less.

[15] The above waste treatment device, further comprising a magnetic separation step in which at least a portion of iron is separated and removed from the waste using a magnetic separator to obtain the first waste.

[16] The above-mentioned waste treatment device, further comprising a stirring step of stirring the waste with an agitator provided on a waste transport path as the waste passes through the agitator, wherein the waste is waste before at least a portion of the iron is selected 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 device and a waste treatment method that recover valuable metals from waste more efficiently than conventional methods. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a waste treatment device. [Figure 2] FIG. 2 is a schematic diagram for explaining in detail an eccentric eddy current separator, a magnetic separator, and an agitator. [Figure 3] FIG. 2 is a schematic diagram for explaining the eccentric eddy current separator in further detail. [Figure 4] FIG. 2 is a schematic diagram for explaining the agitator in detail. [Figure 5] FIG. 2 is a schematic diagram for explaining a magnetic drum provided in the eddy current separator. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a mode for carrying out the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail with reference to the drawings as necessary, but the present invention is not limited to the present embodiment. The present invention can be modified in various ways without departing from the gist of the invention. In the drawings, the same elements are given the same reference numerals, and redundant explanations will be omitted. Furthermore, positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios of the drawings are not limited to those shown.

[0011] The waste treatment device of this embodiment is equipped with an eccentric eddy current separator (hereinafter referred to as an "eccentric eddy current separator") that separates valuable metals from first waste, and the eddy current separator is equipped with a conveyor belt that transports the first waste, a conveyor head pulley and a conveyor tail pulley that rotate the conveyor belt, and a magnetic drum that is arranged within the conveyor head pulley and generates a magnetic field on the conveying surface of the conveyor belt, the rotation speed of the rotatable magnetic drum being 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. In addition, the waste treatment method of this embodiment includes an eddy current separation process in which valuable metals are separated from the first waste using an eccentric eddy current separator. The eddy current separator includes 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 within the conveyor head pulley for generating a magnetic field on the conveying surface of the conveyor belt, the rotation speed of the rotatable magnetic drum being greater than 3000 rpm and less than 4000 rpm, and the valuable metals include one or more metals selected from the group consisting of gold, silver, copper, palladium, and platinum.

[0012] The waste treatment device 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, an eccentric eddy current separator can apply a strong, concentrated magnetic field to the first waste at the optimal position from which the first waste flows through the separator. This can generate a stronger repulsive force on the valuable metals, thereby increasing the flight distance of the valuable metals. Furthermore, by setting the rotation speed of the magnetic drum to more than 3000 rpm and less than 4000 rpm, it is possible to more clearly distinguish between the valuable metals that are subjected to the strong repulsive force and other substances contained in the first waste (hereinafter referred to as "residual substances"). These factors, combined, enable more efficient recovery of valuable metals from the first waste.

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

[0014] The waste treatment device of this embodiment 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 transports the first waste S14, a conveyor head pulley 136 and a conveyor tail pulley 131 that rotate the conveyor belt 132 so as to transport the first waste S14, a magnetic drum 134 that is disposed within the conveyor head pulley 136 and generates a magnetic field on the conveying surface of the conveyor belt 132, a container 135 that is disposed below the conveyor belt 132 and that stores sorted material mainly containing valuable metals S18 and that exhibits a repulsive effect against the magnetic field generated by the magnetic drum 134, a container 137 that stores unsorted material mainly containing residual material S16, which is material other than the valuable metals S18, and a partition plate 138 that is disposed above the container 135 and the container 137.

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

[0016] 3, the axis 134C of the magnet drum 134 is eccentric by a distance d relative to the axis 136C of the conveyor head pulley 136, and is eccentric such that the direction of a perpendicular line passing through the axis 136C of the conveyor head pulley 136 is 0°, and the eccentricity has a positive eccentric angle θ in the rotational direction of the conveyor head pulley 136. It is preferable that the axis 134C of the magnet drum 134 be eccentrically disposed with respect to the axis 136C of the conveyor head pulley 136 at an eccentric angle θ of 0° or more and 20° or less in the rotational direction of the conveyor head pulley 136. This allows the valuable metals S18, which are subjected to a strong repulsive force, to be appropriately thrown forward and upward in the conveying direction, thereby more efficiently and reliably separating the valuable metals S18 from the residue material S16.

[0017] The magnet drum 134 has a plurality of pairs of N-S magnetic poles M, as shown in Fig. 5, for example. The number of pairs of N-S magnetic poles M may be 36 or more and 44 or less, with 44 being particularly preferable within this range. This allows for more efficient and reliable separation of valuable metals S18 and residual materials S16. Note that in Fig. 5, the number of pairs of N-S magnetic poles M is 44.

[0018] The transport speed of the conveyor belt 132 that transports the first waste S14 is not particularly limited and may be set appropriately depending on the type and size of the substances contained in the first waste S14, the type of valuable metals to be separated, etc. From this perspective, the transport speed of the conveyor belt 132 may be 1.0 m / s or more and 3.0 m / s or less, and is preferably 1.5 m / s or more and 2.5 m / s or less.

[0019] The rotation speed of the magnetic drum 134 is greater than 3000 rpm and less than 4000 rpm. When the rotation speed of the magnetic drum 134 is within this range, the content of valuable metals S18 contained in the sorted material can be increased, and the content of valuable metals S18 mixed into the residue material S16 can be reduced. As a result, the valuable metals S18 can be recovered sufficiently efficiently. From a similar perspective, the rotation speed of the magnetic drum 134 may be greater than 3000 rpm and less than or equal to 3850 rpm.

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

[0021] The partition plate 138 is preferably disposed above the container 135 and the container 137. The valuable metals S18 and the residual material S16 fall after detaching from the conveyor belt 132 and are stored in the container 135 or the container 137. However, depending on the condition of the input first waste S14 (e.g., 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 metals S18), the falling trajectory of the valuable metals S18 and the residual material S16 may not always be constant and may vary. As a result, there is a risk that the valuable metals S18 will be stored in the container 137 or the residual material S16 will be stored in the container 135 in an amount exceeding the desired amount. Therefore, the partition plate 138 is installed above the container 135 and the container 137 to separate the falling area after passing through the partition plate 138 into the container 135 and the container 137. This makes it possible to further improve the efficiency of separation between the valuable metals S18 and the residual material S16. The shape, position, and dimensions of the partition plate 138 are not particularly limited, and may be appropriately set depending on the amount, type, and dimensions of the first waste S14 to be treated and the valuable metals S18 and residual material S16 to be separated so that the valuable metals S18 and residual material S16 are efficiently separated.

[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 materials S16. When the waste treatment device is equipped with both the pretreatment device 102 (described below) and the magnetic separator 110 (described below), the first waste S14 may be obtained by further treating the second waste S12, which is obtained by treating the waste S10 input into the waste treatment device with the pretreatment device 102, with the magnetic separator 110. The first waste S14 and the second waste S12 may also be obtained from a manufacturer 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 incineration ash, construction waste soil, scrapped automobiles, and shredder dust generated by shredding discarded home appliances. Examples of incineration ash include ash obtained by incinerating municipal solid waste and industrial waste. Specific examples include ash obtained by incinerating industrial waste such as sludge, waste plastics, scrap metal, scrap glass, scrap concrete, scrap ceramics, slag, and rubble, as well as shredder dust and ash obtained by incinerating general waste. Examples of construction waste include soil and sludge generated secondarily during construction and civil engineering work. The waste may be a single waste material or a mixed waste material containing multiple types of waste. Among the waste materials, preferred examples in this embodiment include cathode materials, anode materials, PTP sheets, aluminum laminates, and aluminum pouches derived from waste batteries. When the waste is incineration ash, the incineration ash may be incineration bottom ash, dust ash, or a mixture thereof.

[0023] Note that if the waste treatment device is equipped with the pre-treatment device 102 but not the magnetic separator 110, the second waste S12 and the first waste S14 will be substantially the same, and therefore the second waste S12 may be regarded as the first waste S14. Also, if the waste treatment device is equipped with the magnetic separator 110 but not the pre-treatment device 102, the waste S10 and the second waste S12 will be substantially the same, and therefore the waste S10 may be regarded as the second waste S12. Furthermore, if the waste treatment device is not equipped with the pre-treatment device 102 or the magnetic separator 110, the waste S10, the second waste S12, and the first waste S14 will be substantially the same, and therefore the waste S10 and the second waste S12 may be regarded 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 the content of valuable metals S18 contained in the first waste S14 to be further increased. Furthermore, the size of the first waste S14 can be made more uniform compared to when waste exceeding the above range is included. As a result, it becomes possible to more efficiently separate the valuable metals S18 from the first waste S14. The size of the first waste can be adjusted by appropriately selecting the mesh size of the sieve described below. For example, if the size is to be 4 mm or less, first waste having a size of 4 mm or less can be obtained by setting the mesh size of the 3D screen 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 allows the first waste S14 to contain less iron before being fed to the eddy current separator 130. For example, in FIG. 2, the iron separated and removed by the magnetic separator 110 is collected in a container 139. Iron is contained in the residual material S16, and by reducing the amount of iron in advance, the efficiency of separation of the valuable metals S18 and the residual material S16 in the eddy current separator 130 can be further improved.

[0026] The magnetic separator 110 may be a conventionally known type, and may be a stationary type magnetic separator as shown schematically in Fig. 2, or a hanging type magnetic separator. In Fig. 2, the second waste S12 is transported by a 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 FIG. 2. The agitator 120 agitates the first waste S14 or the second waste S12 placed on a conveyor belt. The conveyor belt 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 in an earlier stage (e.g., conveyor belt 140). By agitating the waste S10, the first waste S14, or the second waste S12 with the agitator 120, the clumping and interlocking of the valuable metals S18 and the residual material S16 contained in the waste can be broken down and leveled. As a result, the valuable metals S18 and the residual material S16 can be more easily separated in the subsequent eddy current separator 130 or magnetic separator 110. The agitator 120 may be provided at any position on the waste transport route where the waste can be agitated. Although three agitators 120 are provided in Fig. 2, only one or two of the agitators 120 may be provided.

[0028] The structure of the agitator 120 is not particularly limited as long as it can agitate the first waste S14 or the second waste S12, and may be, for example, the agitator 120 shown in Fig. 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 placed on a conveyor belt as they move and pass through the agitator 120.

[0029] 4, the agitator 120 includes a flat plate 124 that is substantially parallel to the conveying surface of the conveyor belt 112, a plurality of agitating rods 126 that protrude below the flat plate 124 and are positioned offset from the center of the flat plate, and a rotating shaft 122 that is disposed so as to eject material upward from the center of the flat plate 124 and that can rotate the flat plate 124. As the flat plate 124 rotates around the rotating shaft 122, the plurality of agitating rods 126 move in various directions above the conveying surface, and the second waste S12 is agitated by the agitating rods 126. As described above, this allows the clumping and interlocking of the valuable metals S18 and residual materials S16 contained in the second waste S12 to be broken up and leveled, making it easier to separate the valuable metals and residual materials S16 in the magnetic separator 110 or the eddy current separator 130.

[0030] The second waste S12 or the first waste S14 may be obtained by treating the waste S10 in a pretreatment device 102. The pretreatment device 102 may be an appropriate combination of a conveyor belt for transporting the waste S10 or waste obtained by further treating the waste S10 (hereinafter simply referred to as "waste"); a magnetic separator (however, this is a different magnetic separator from the magnetic separator 110 described above) for separating and removing iron from the waste; a concentric eddy current separator for separating non-ferrous metals from the waste; a sieve such as a 3D screen for aligning the size of the waste within a certain range; and a crusher for crushing the waste to a desired size. By treating the waste S10 in the pretreatment device 102, the second waste S12 or the first waste S14 having a size of, for example, 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 device described above with reference to Figures 1 to 5. More specifically, the waste treatment method of this aspect includes an eddy current sorting step of sorting valuable metals S18 from first waste S14 using an eddy current sorter 130, the rotation speed of a rotatable magnetic drum 134 provided in the eddy current sorter 130 is more than 3000 rpm and less than 4000 rpm, and the valuable metals S18 include one or more metals 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 and removed from the second waste S12 using a magnetic separator 110 to obtain the first waste S14. The waste treatment method of this embodiment also preferably includes an agitation step in which the waste is agitated by an agitator 120 as the waste passes through the agitator provided on the waste transport path. Furthermore, the waste treatment method of this embodiment may include a pretreatment step in which the waste S10 is treated in 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, and therefore will not be described here. [Industrial Applicability]

[0033] The waste treatment device and waste treatment method of the present invention enable valuable metals to be recovered from waste more efficiently than conventional methods, and therefore have industrial applicability in fields such as recovering valuable metals from ash generated when waste such as municipal solid waste is incinerated in an incinerator, and utilizing the recovered valuable metals. [Explanation of symbols]

[0034] 102...pretreatment 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 valuable metals from the first waste; The eddy current separator includes a conveyor belt for transporting the first waste material, a conveyor head pulley and a conveyor tail pulley for rotating the conveyor belt, and a magnetic drum disposed within the conveyor head pulley for generating a magnetic field on a conveying surface of the conveyor belt; The rotation speed of the rotatable magnetic drum is more than 3000 rpm and less than 4000 rpm, A waste treatment device, wherein the valuable metal comprises at least one metal selected from the group consisting of gold, silver, copper, palladium, and platinum.

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

3. The waste disposal device of claim 1 , wherein the first waste material has a size of 4 mm or less.

4. The waste treatment device described in claim 1, wherein the magnetic drum is eccentric relative to the axis of the conveyor head pulley, and has an axis that has a positive eccentric angle in the rotation direction of the conveyor head pulley when a perpendicular direction passing through the axis of the conveyor head pulley is set to 0°, and the positive eccentric angle is between 0° and 20°.

5. The waste treatment device according to claim 1 , wherein the conveying speed of the conveyor belt that conveys the first waste is 1.5 m / s or more and 2.5 m / s or less.

6. 2. The waste treatment device according to claim 1, wherein the number of pairs of north and south magnetic poles in the magnetic drum is 36 or more and 44 or less.

7. The waste treatment device of claim 1 , further comprising a magnetic separator that separates out at least a portion of the iron from the waste to obtain the first waste.

8. The waste treatment device according to claim 1, further comprising an agitator on a waste transport path, the waste being agitated as it passes through the agitator.

9. an eddy current sorting step of sorting valuable metals from the first waste using an eccentric eddy current sorter; The eddy current separator includes a conveyor belt for transporting the first waste material, a conveyor head pulley and a conveyor tail pulley for rotating the conveyor belt, and a magnetic drum disposed within the conveyor head pulley for generating a magnetic field on a conveying surface of the conveyor belt; The rotation speed of the rotatable magnetic drum is more than 3000 rpm and less than 4000 rpm, The waste treatment method, wherein the valuable metal comprises at least one metal selected from the group consisting of gold, silver, copper, palladium, and platinum.

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

11. 10. The method for treating waste according to claim 9, wherein the size of the first waste is 4 mm or less.

12. 10. The waste disposal method according to claim 9, wherein the magnetic drum is eccentric relative to the axis of the conveyor head pulley, and has an axis that has a positive eccentric angle in the rotational direction of the conveyor head pulley when a perpendicular direction passing through the axis of the conveyor head pulley is set to 0°, and the positive eccentric angle is between 0° and 20°.

13. 10. The waste disposal method according to claim 9, wherein the conveying speed of the conveyor belt that conveys the first waste is 1.5 m / s or more and 2.5 m / s or less.

14. 10. The waste treatment method according to claim 9, wherein the number of pairs of north and south magnetic poles in the magnetic drum is 36 or more and 44 or less.

15. The waste treatment device according to claim 9, further comprising a magnetic separation step of obtaining the first waste by separating and removing at least a portion of iron from the waste using a magnetic separator.

16. a stirring step of stirring the waste with an agitator provided on a waste transport path when the waste passes through the agitator, The waste treatment device according to claim 9 , wherein the waste is waste before at least a portion of iron is removed to obtain the first waste.

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