JP4252559B2 - Magnetic sorting device and sorting system - Google Patents

Description

  The present invention relates to a magnetic sorting device and a sorting system that can remove a foreign substance of a weak magnetic substance contained in sorted items such as dry granules and powder products.

Conventionally, as this type of invention, there is an invention related to a “magnetic sorting device” described in Patent Document 1. FIG. 3 is a schematic configuration diagram of the magnetic force sorting device described in Patent Document 1.
As shown in FIG. 3, the magnetic separator 40 has a hopper 41, a quantitative supply mechanism 44 composed of a pair of quantitative supply rollers 42 and 43, and a screened material on which at least foreign substances made of weak magnetic material are mixed or adhered. A rotatable hollow rotating cylinder 45 to be received, a permanent magnet 46 which is rotatably arranged in the length direction in the hollow portion of the rotating cylinder 45 and generates a predetermined magnetic field in the length direction, and separation adjustment And a plate 47.

According to the magnetic sorting device 40, the sorted items stored in the hopper 41 are discharged from the discharge port of the hopper 41 onto the fixed supply rollers 42 and 43. Then, the selected items are continuously supplied by the fixed amount supply rollers 42 and 43 in a fixed amount in the length direction of the rotary tube 45 on the upper surface side of the rotary tube 45. The sorted product continuously supplied to the upper surface side of the rotary cylinder 45 is conveyed toward the discharge side by the rotation of the rotary cylinder 45. When the selected item reaches the discharge end of the rotating cylinder 45, the selected item is ejected from the rotating cylinder 45 at a conveying speed, and downward acceleration due to gravity is added to the conveying speed, so that the selected item falls while changing the speed. I will do it. At this time, when foreign matter is mixed in or adhered to the selected item, the magnetic force by the permanent magnet 46 acts on the foreign matter when the foreign matter is discharged from the rotary cylinder 45. For this reason, when the foreign matter is discharged, it is attracted to the permanent magnet and cannot be separated from the rotary cylinder 45, and is stored in the defective product receiver 48 by the separation adjusting plate 47.
Japanese Patent Laid-Open No. 2004-9005

However, in the magnetic force sorting apparatus 40 described in Patent Document 1, foreign matter is separated from the sorted matter by providing one set of the rotating cylinders 45 on which the permanent magnets 46 are arranged, so that the magnetic force of the permanent magnets 46 acts. There is a limit to the range of foreign matter in the sorted product, and therefore, there is a case where the foreign matter in the sorted product cannot be completely removed, resulting in poor separation efficiency.
The present invention has been made in order to solve the above-described problems of the prior art, and its purpose is to widen the range of foreign matter to which the magnetic force of the permanent magnet acts in the sorted matter and to separate the foreign matter from the sorted matter. It is an object of the present invention to provide a magnetic sorting device and a sorting system.

A magnetic separator according to claim 1 of the present invention includes a passage through which a selection falls,
A plurality of magnetic force sorting means arranged in the passage;
A discharge unit that is disposed below each of the magnetic force sorting means and discharges foreign matter made of a magnetic material in the sorted matter, and
Each of said magnetic separator means, the screened product receives in the outer peripheral surface, a hollow rotating cylinder you discharged After conveyed by rotating said sorted matter received, Oite in the hollow portion of the rotary cylinder to fall A permanent magnet that is arranged along a length direction of the rotating cylinder and that imparts a magnetic force to the selected object when the selected object is discharged from the rotating cylinder ,
The plurality of magnetic force sorting means are arranged alternately on one side and the other side of the passage while being shifted in the vertical direction, and the rotation direction of the rotary cylinder of the magnetic force sorting means arranged on the one side and the The rotating direction of the rotating cylinder of the magnetic force sorting means arranged on the other side is arranged to be opposite to each other,
Each of the permanent magnets of the plurality of magnetic force sorting means is fixed in a state of being eccentric to the passage side with respect to the rotary cylinder in the hollow portion of the rotary cylinder .

According to a second aspect of the present invention, there is provided the magnetic force sorting apparatus according to the first aspect, wherein each of the plurality of magnetic force sorting means is movable in a direction perpendicular to the length direction of the rotating cylinder. It is provided in .
According to a third aspect of the present invention, there is provided the magnetic separator according to the first or second aspect, wherein the permanent magnet has a surface magnetic force of 1.2 Tesla or more. .

A sorting system according to a fourth aspect of the present invention includes the magnetic force sorting device according to any one of the first to third aspects,
A metal detector that is disposed downstream of the magnetic separator and detects a non-magnetic metal contained in the sorted matter from which foreign substances made of a magnetic material have been removed by the magnetic separator;
It is arranged on the downstream side of the metal detector, and comprises a non-magnetic metal separating means for separating a non-magnetic metal-containing sort and a non-magnetic metal-free sort.

According to the magnetic force sorting apparatus described in claim 1 of the present application, the plurality of magnetic force sorting means are arranged alternately on one side and the other side of the passage while being shifted in the vertical direction, and arranged on the one side. The rotating direction of the rotating cylinder of the magnetic force sorting means and the rotating direction of the rotating cylinder of the magnetic force sorting means arranged on the other side are opposite to each other, and the plurality of magnetic force sorting The permanent magnets of the means are fixed in the hollow portion of the rotating cylinder in a state of being eccentric to the passage side with respect to the rotating cylinder, so that the magnetic force of the permanent magnet acts in the selection. It becomes possible to widen the range of the foreign substance of the magnetic material, and to improve the separation efficiency of the foreign substance from the selection.
In addition , it is possible to improve the separation efficiency of the foreign matter from the sorted material , and it is possible to make the arrangement of the magnetic force sorting means in the magnetic force sorting device compact.

Further, according to the magnetic force sorting apparatus described in claim 2 of the present application, each of the plurality of magnetic force sorting means is sorted by a configuration provided so as to be movable in a direction orthogonal to the length direction of the rotating cylinder. The position of the magnetic force sorting means can be adjusted according to the particle size and viscosity of the object. In addition, by adjusting the position of the magnetic force sorting means, even when the magnetic force sorting device is provided with a plurality of magnetic force sorting means, the sorted matter falling from the rotating cylinder of the magnetic force sorting means provided on the upstream side is downstream. Therefore, it is possible to reliably receive it on the rotating cylinder of the magnetic sorting means on the side, and it is possible to further improve the efficiency of separating foreign substances from the sorted matter.
Further, according to the magnetic separator apparatus described in the claims 3, wherein the permanent magnet, the configuration the magnetic force of the surface Ru Oh 1.2 Tesla or higher, a better separation efficiency of the foreign matter from the sorted matter It becomes possible.

Furthermore, according to the sorting system described in claim 4 of the present application, the magnetic field sorting device according to any one of claims 1 to 3 and the downstream side of the magnetic force sorting device, A metal detector for detecting a non-magnetic metal contained in a sorted product from which foreign substances made of a magnetic material have been removed by a magnetic sorting device; and a sorted product that is arranged downstream of the metal detector and contains a non-magnetic metal; A non-magnetic metal separating means for separating a non-magnetic metal-free sorted material, and further removing the non-magnetic metal contained in the sorted product from which foreign substances of the magnetic material have been removed by the magnetic sorting device. This makes it possible to expand the selection targets and provide a selection system with added value.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a sorting system according to an embodiment of the present invention. Fig.2 (a) is a figure which shows the quality goods in a selection. FIG. 2B is a diagram showing a foreign substance made of a magnetic substance in the selected item. FIG. 2C is a diagram showing a defective product in which foreign substances made of a magnetic material are mixed in a non-defective product. FIG. 2D is a diagram showing a defective product in which foreign substances made of a magnetic material adhere to a good product. FIG.2 (e) is a figure which shows the foreign material which consists of a nonmagnetic metal in a selection thing. FIG. 2 (f) is a diagram showing a defective product in which foreign matters made of a non-magnetic metal are mixed in a non-defective product. FIG. 2 (g) is a diagram showing a defective product in which a foreign material made of a non-magnetic metal adheres to a good product.

Before describing the sorting system 30 according to the present invention, the sorted items sorted by the sorting system 30 will be described.
In general, dry foods such as dried vegetables, sesame seeds, dried hijiki, dried shiitake mushrooms, spices, sprinkling ingredients, dried granule products such as tea products, soups, spice powder products and resin pellets, etc. At times, magnetic materials such as iron, stainless steel, cobalt, nickel and iron oxides in stone and mud, and nonmagnetic metals such as aluminum and copper are necessarily included. And in the selection, the non-defective product a in which the magnetic body b and the nonmagnetic metal c shown in FIG. 2 (a) are not mixed and adhered, the foreign material consisting of the magnetic body b shown in FIG. 2 (b), The defective product in which the magnetic material b is mixed in the non-defective product a shown in 2 (c), the defective product in which the magnetic material b is attached to the good product a shown in FIG. 2 (d), and the magnetic material b is mixed in and attached to the good product a. A defective product (not shown), a foreign substance made of the nonmagnetic metal c shown in FIG. 2E, a defective product in which the nonmagnetic metal c is mixed in the non-defective product a shown in FIG. A defective product in which the non-magnetic metal c adheres to the non-defective product a shown in (g) and a defective product (not shown) in which the non-magnetic metal c is mixed and adhered to the good product a are mixed.

As shown in FIG. 1, the sorting system 30 includes a magnetic sorter 1, a metal detector 31, and a nonmagnetic metal separator 32.
The magnetic sorting apparatus 1 includes a hopper 2, a fixed supply mechanism 5 including a pair of fixed supply rollers 3, 4, a first magnetic sorting means 6, a second magnetic sorting means 7, and a passage 8. ing.
Here, in the hopper 2, at least foreign matter made of weak magnetic material is mixed, that is, a foreign product made of magnetic material b and a defective product in which foreign matter is mixed and / or adhered (hereinafter, collectively referred to as a defective magnetic material). The sorting product to be contained is accommodated, and the discharge port of the hopper 2 is opposed to the gap between the quantitative supply rollers 3 and 4 disposed below the hopper 2.

The fixed amount supply mechanism 5 is composed of a pair of rotatable fixed amount supply rollers 3 and 4. Upon receiving the sorted product discharged from the discharge port of the hopper 2, the received sorted product is passed through the passage 8 to the first. A fixed amount is continuously supplied in the length direction on the upper surface side of the rotating cylinder 9.
The first magnetic sorting unit 6 includes a first rotating cylinder 9, a first permanent magnet 10, and a first fall prevention plate 11, and the second magnetic sorting unit 7 includes a second magnetic sorting unit 7. Rotating cylinder 12, second permanent magnet 13, and second fall prevention plate 14.

  The first rotating cylinder 9 and the second rotating cylinder 12 are for receiving and transporting a sorted object including defective magnetic materials on the upper surface, and are constituted by thin-walled (for example, 1 mm or less) hollow cylinders. Yes. The rotating cylinders 9 and 12 are entirely made of a metal that is hard to wear, such as stainless steel, and are rotated at a predetermined speed by a motor (not shown). Further, by controlling the rotation of the motor, the number of rotations of each of the rotary cylinders 9 and 12 can be controlled, and by this control, the conveyance amount per unit time of the selected item can be controlled.

  The first permanent magnet 10 and the second permanent magnet 13 have a surface magnetic force of 12,000 gauss or more, and are formed in a substantially cylindrical shape as a whole. The first permanent magnet 10 is provided in the first rotary cylinder 9, and the second permanent magnet 13 is provided in the second rotary cylinder 12. In this case, the permanent magnets 10 and 13 are arranged on the upper side in the hollow portions of the rotary cylinders 9 and 12, respectively, on the side where the selected items on the rotary cylinders 9 and 12 are discharged. And a predetermined magnetic field is generated in the length direction. The permanent magnets 10 and 13 apply a magnetic force to the selected items when the selected items on the upper surfaces of the rotary cylinders 9 and 12 are discharged. Here, the permanent magnets 10 and 13 can move in the direction intersecting the length direction of the rotary cylinders 9 and 12 in the rotary cylinders 9 and 12 and can be positioned at predetermined positions after the movement. You may comprise.

  The first fall prevention plate 11 and the second fall prevention plate 14 are respectively the first fall prevention plate 11 on the outer peripheral surface of the first rotary cylinder 9 and the second fall prevention plate 14 on the second rotary cylinder. 12 outer peripheral surfaces are provided. In this case, each fallen object prevention plate 11, 14 is arranged in the length direction of each rotary cylinder 9, 12, and the sorting object or the first one supplied from the fixed quantity supply mechanism 5 onto the first rotary cylinder 9. The selected material supplied from the rotary cylinder 9 onto the second rotary cylinder 12 is prevented from falling in the direction opposite to the rotation direction of the rotary cylinders 9 and 12.

  The first magnetic force sorting means 6 and the second magnetic force sorting means 7 are the second magnetic force sorting means through the passage 8 after the first magnetic force sorting means 6 has removed the magnetic material unnecessary products. 7 is arranged so as to be shifted up and down in the flow direction (vertical direction in FIG. 1) of the sorted product so that the second rotary cylinder 12 of 7 is received on its upper surface. In this case, the direction of rotation of the first rotary cylinder 9 and the direction of rotation of the second rotary cylinder 12 are such that the discharge directions of the sorted items of both rotary cylinders 9 and 12 face each other via the passage 8. They are alternately arranged in the opposite direction. Further, the first magnetic force sorting means 6 and the second magnetic force sorting means 7 are provided so as to be movable in a direction perpendicular to the length direction of each of the rotary cylinders 9 and 12 (in and out direction with respect to the passage 8). Thus, the position can be appropriately adjusted according to the particle size and viscosity of the selected item or according to the position of the falling item.

  In addition, on the downstream side of the magnetic force sorting means 6 and 7 in the passage 8, defective product chutes 16 and 17 for discharging defective magnetic materials are connected. The first magnetic separator 18 is provided at the upper end of the connection between the defective chute 16 and the passage 8, and the second magnetic separator 19 is provided at the upper end of the connection between the defective chute 17 and the passage 8. Yes.

  The first magnetic separator 18 guides the defective magnetic material separated by the action of the first magnetic force sorting means 6 to the defective product chute 16 and guides the selected product after removing the defective magnetic material to the passage 8. belongs to. The second magnetic separation plate 19 guides the defective magnetic material separated by the action of the second magnetic force sorting means 7 to the defective product chute 17, and the sorted product after the defective magnetic material is separated. It leads to the passage 8. Since both the magnetic material separating plates 18 and 19 are different in the discharge state of the selected material depending on the weight of the selected material and the rotational speed of the rotary cylinders 9 and 12, the arrangement angle can be adjusted accordingly. In other words, the first magnetic body separating plate 18 can be adjusted with the shaft 20 and the second magnetic body separating plate 19 can be swung about the shaft 21 to adjust the arrangement angle, and after the adjustment, the arrangement angle can be fixed. It has become. Further, the magnetic separators 18 and 19 can be moved in the same direction by moving the shafts 20 and 21 in a direction perpendicular to the length direction of the rotary cylinders 9 and 12, respectively. It can be fixed.

When the sorted product is supplied into the hopper 2, the sorted product is discharged from the discharge port of the hopper 2 by its own weight and falls onto the fixed supply rollers 3 and 4.
The sorts that have fallen on the fixed supply rollers 3 and 4 are continuously supplied by the fixed supply rollers 3 and 4 on the upper surface side of the first rotary cylinder 9 and in the length direction of the first rotary cylinder 9. To be supplied.
Since the first rotating cylinder 9 is rotated at a predetermined speed, the sorted material supplied to the first rotating cylinder 9 is conveyed toward the discharge side by the rotation. When the selected item reaches the discharge end of the first rotating cylinder 9, the selected item is ejected from the first rotating cylinder 9 at the conveying speed, and downward acceleration due to gravity is added to the conveying speed. Falls with changing speed.

At this time, the magnetic force by the first permanent magnet 10 does not act on the non-magnetic material selection in the selection when it is released from the first rotating cylinder 9. For this reason, since the non-magnetic material is discharged to a position far away from the first rotary cylinder 9, it passes through the passage 8 and is on the upper surface side of the second rotary cylinder 12, and the second rotary cylinder 12. Is continuously supplied in the longitudinal direction.
On the other hand, the magnetic defective product in the selected item is subjected to the magnetic force by the first permanent magnet 10 when it is released from the first rotating cylinder 9. For this reason, the defective magnetic material is attracted to the second permanent magnet 10 when released from the first rotating cylinder 9 and cannot be moved far from the first rotating cylinder 9, and the defective chute 16 is Then, it is accommodated in the defective product receiver 22.

In this case, the first magnetic force is influenced by the supply location on the upper surface of the first rotating cylinder 9 of the selected item, the weight of the defective magnetic substance in the selected item, the adjustment of the first magnetic separator 18 and the like. It is difficult to remove all the defective magnetic materials in the sorted product using only the sorting means 6. Therefore, the defective magnetic material is supplied to the second magnetic force sorting means 7 through the passage 8.
The second magnetic sorting unit 7 operates in the same manner as the first magnetic sorting unit 6, and the sorting supplied to the second rotating cylinder 12 is in the sorting as in the case of the first magnetic sorting unit 6. The defective magnetic material is separated.

At this time, the non-magnetic material in the selected material is discharged to a position far away from the second rotary cylinder 12, so that the metal provided on the downstream side of the magnetic force sorting device 1 through the passage 8. It is supplied to the detector 31.
On the other hand, the defective magnetic material in the selected item cannot be separated from the second rotating cylinder 12 when released from the second rotating cylinder 12, and passes through the defective product chute 17 in the defective product receiver 23. Is housed in.

  In this way, the first magnetic force sorting means 6 and the second magnetic force sorting means 7 are shifted in the upper and lower two stages in the passage 8, and the discharge direction of the sorted matter in both the rotating cylinders 9 and 12 is changed through the passage 8. By disposing the rotation directions alternately in opposite directions so as to face each other, the second magnetic force sorting means 7 is arranged so as to avoid the interference of the defective product chute 16 provided below the first magnetic force sorting means 6. This makes it possible to make the arrangement of the first magnetic sorting unit 6 and the second magnetic sorting unit 7 in the magnetic sorting apparatus 1 compact, and the magnetic force of the permanent magnet acts in the sorted item. The range of defective magnetic materials can be widened, and the separation efficiency of defective magnetic materials from selected items can be improved.

  In addition, although the magnetic force sorting apparatus 1 according to the present embodiment includes two magnetic force sorting means, the first magnetic force sorting means 6 and the second magnetic force sorting means 7, Three or more magnetic force sorting means may be provided. In this case as well, each magnetic force sorting means is shifted up and down in the flow direction of the sorted matter in the passage 8, and the discharge direction of the sorted matter of each magnetic force sorting means is changed. By making them face each other via the passage 8 and arranging them so that the rotation directions of the rotary cylinders are alternately reversed, the same operations and effects as those of the magnetic separator 1 can be obtained.

Here, the non-magnetic material selected from the non-magnetic material from which the defective magnetic material has been removed by the magnetic force sorting device 1 contains non-defective products a in which non-magnetic metals such as aluminum and copper are not mixed and adhered, and non-magnetic metal c. The product in which the nonmagnetic metal c is mixed and / or adhered is mixed.
The metal detector 31 is installed downstream of the passage 8 and the nonmagnetic metal c and the nonmagnetic metal c contained in and / or attached to the sorted product from which the defective magnetic material is removed by the magnetic sorting device 1 (Hereinafter referred to as a non-magnetic metal defective product) is detected. The metal detector 31 has a through-passage 33 through which a selection object falling in the approximate center of the head can pass, and the through-passage 33 has an oscillation coil (not shown) for generating an electromagnetic field. And a receiving coil (not shown) for exciting a voltage by an electromagnetic field generated by the oscillation coil. The metal detector 31 is configured to send a nonmagnetic metal detection signal to a control device (not shown) when the output voltage difference of the receiving coil exceeds a threshold value.

  The nonmagnetic metal separation device 32 is arranged on the downstream side of the metal detector 31 and separates the sorted material that has passed through the metal detector 31 into a nonmagnetic metal defective product and a non-defective product a. The nonmagnetic metal separation device 32 includes a separation plate 35 that can swing inside, and a non-defective product discharge portion 36 located at a lower position corresponding to the through-path 33 of the metal detector 31 with the separation plate 35 interposed therebetween, and vice versa. And a defective product discharge portion 37 located on the side. A defective product receiver 38 is disposed below the defective product discharge section 37, and a non-defective product receiver 39 is disposed below the non-defective product discharge section 36.

  When the control device receives the nonmagnetic metal detection signal from the metal detector 31, the control device outputs a nonmagnetic metal defective product discharge command to the separation plate 35 of the nonmagnetic metal separation device 32, and the separation plate 35 Based on the non-magnetic metal defective product output command, the non-magnetic metal defective product in the selected item is accumulated in the defective product receiver 38 via the defective product discharge unit 37 by swinging in the direction of the broken line in FIG. On the other hand, when the control device does not receive the nonmagnetic metal detection signal from the metal detector 31, the control device does not output a nonmagnetic metal defective product discharge command to the separation plate 35 of the nonmagnetic metal separation device 32 and separates it. The plate 35 maintains the position of the solid line in FIG. 2, and the non-defective product “a” is accumulated in the non-defective product receiver 39 through the non-defective product discharge unit 36.

With such a configuration, according to the sorting device 30, it is possible to further remove non-magnetic metal defective products contained in the sorted product from which the magnetic defective products have been removed by the magnetic sorting device 1, thereby expanding the selection target. This makes it possible to provide a sorting system with added value.
As mentioned above, although embodiment of this invention has been described, this invention is not limited to this, A various change can be made.

For example, in the present embodiment, the sorting system 30 includes the metal detector 31 and the nonmagnetic metal separator 32 downstream of the magnetic separator 1. However, the metal detector 31 and the nonmagnetic metal separator are provided. It is good also as a structure which discharges | excludes the sorting thing from which the magnetic body defect product was removed without providing 32.
Further, the metal detector may have another structure as long as it has a function of detecting a non-magnetic metal defective product in a sorted product that does not include a magnetic defective product.
Furthermore, the structure of the nonmagnetic metal separation device may be of another structure as long as it has a function of separating a nonmagnetic metal defective product and a sorted product that does not contain a nonmagnetic metal defective product. Absent.

1 is a schematic configuration diagram of a sorting system according to an embodiment of the present invention. It is a figure which shows a selection thing. It is a schematic block diagram of the magnetic sorting apparatus described in patent document 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic separator 2 Hopper 3 Fixed supply roller 4 Fixed supply roller 5 Fixed supply mechanism 6 1st magnetic sorting means 7 2nd magnetic sorting means 8 Path | route 9 1st rotary cylinder 10 1st permanent magnet 11 1st Fall prevention plate 12 Second rotating cylinder 13 Second permanent magnet 14 Second fall prevention plate 16 Defective product chute 17 Defective product chute 18 First magnetic material separation plate 19 Second magnetic material separation plate 20 Axis 21 Axis 22 Defective product receiver 23 Defective product receiver 30 Sorting system 31 Metal detector 32 Non-magnetic metal separator 33 Passage path 35 Separating plate 36 Non-defective product discharge part 37 Defective product discharge part 38 Defective product receiver 39 Good product receiver a Good product b Magnetic material c Non Magnetic metal 40 Magnetic separator 41 Hopper 42 Fixed supply roller 43 Fixed supply roller 44 Fixed supply mechanism 45 Rotating cylinder 46 Permanent magnet 47 Separation adjusting plate 48 Defective product receiver

Claims (4)

A passage through which the selection falls,
A plurality of magnetic force sorting means arranged in the passage;
A discharge unit that is disposed below each of the magnetic force sorting means and discharges foreign matter made of a magnetic material in the sorted matter, and
Each of said magnetic separator means, the screened product receives in the outer peripheral surface, a hollow rotating cylinder you discharged After conveyed by rotating said sorted matter received, Oite in the hollow portion of the rotary cylinder to fall A permanent magnet that is arranged along a length direction of the rotating cylinder and that imparts a magnetic force to the selected object when the selected object is discharged from the rotating cylinder ,
The plurality of magnetic force sorting means are arranged alternately on one side and the other side of the passage while being shifted in the vertical direction, and the rotation direction of the rotary cylinder of the magnetic force sorting means arranged on the one side and the The rotating direction of the rotating cylinder of the magnetic force sorting means arranged on the other side is arranged to be opposite to each other,
Each of the permanent magnets of the plurality of magnetic force sorting means is fixed in a state where it is eccentric to the passage side with respect to the rotating cylinder in the hollow portion of the rotating cylinder . 2. The magnetic force sorting apparatus according to claim 1 , wherein each of the plurality of magnetic force sorting means is provided so as to be movable in a direction orthogonal to a length direction of the rotating cylinder . 3. A magnetic separator according to claim 1 , wherein the permanent magnet has a surface magnetic force of 1.2 Tesla or more . A magnetic separator according to any one of claims 1 to 3,
A metal detector that is disposed downstream of the magnetic separator and detects a non-magnetic metal contained in the sorted matter from which foreign substances made of a magnetic material have been removed by the magnetic separator;
A sorting system arranged on the downstream side of the metal detector, comprising: a sorting object containing a non-magnetic metal; and a non-magnetic metal separating means for separating a sorting object containing no non-magnetic metal.

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