JP6056617B2 - Method and apparatus for separating ferromagnetic material - Google Patents

Description

  The present invention relates to a technique for separating ferromagnetic particles from a granular material containing ferromagnetic particles. For example, the present invention relates to a ferromagnetic material suitable for separating iron from slag, which is a byproduct of an iron making process. The present invention relates to a separation method and apparatus.

  In the hot metal preliminary treatment and converter decarburization process, slag (iron slag) is generated as a by-product of the treatment. This slag is a reaction and product of calcium additives added to remove impurities and unnecessary elements in hot metal and molten steel. In addition to the removed elemental compounds, slag contains a lot of iron. It is. Most of the forms of slag are massive, but the size (size before aggregation) is about several hundred μm even if it is large.

  Since slag contains a lot of iron, it is separated and recovered for recycling. Usually, iron recovered from slag is mixed with scrap in a converter process to produce a cold iron source, and thus iron is separated and recovered in the following steps. First, the slag is passed through a sieve called grits, and a large (several hundred mm) iron block contained in the slag is removed (shape selection). The small lump that has passed through the grease-type sieve has the iron and slag components fixed, so it is roughly crushed with a Hanmark lasher or rod mill to a size of several hundreds of μm to several tens of mm and separated into single pieces (separation of slag and iron) ). Thereafter, iron is separated by magnetic separation. As this magnetic separator, devices such as a hanging type, a drum type, and a pulley type are generally used.

In raw material processing and by-product recycling processing, when charging the material into a separation device such as a magnetic separator, the material is crushed and pulverized in advance to form a granular material. Is planned.
Magnetic separators are widely used as a means for recovering iron (ferromagnetic particles) from such a granular material, but the more the particle size distribution of the granular material is sharp, that is, the larger the particle size is, Separation efficiency is good. In other words, a granular material in which particles of various particle sizes are mixed has poor separation efficiency. This will be described with reference to FIG.

  FIG. 5 shows a pulley type magnetic separator, and one pulley holding the conveyor belt 60 constitutes a magnet pulley 61. In the circumferential direction inside the magnet pulley 61, magnetic poles (permanent magnets) having different polarities are alternately arranged. This magnetic pole is a fixed magnet that is fixedly installed independently from the rotatable pulley body. In this magnetic separator, a granular material a containing ferromagnetic particles is supplied onto a conveyor belt 60 from a supply device (not shown), and when the granular material a is discharged from the end of the conveyor, a magnet pulley is used. The magnetic force of 61 is applied to separate the ferromagnetic particles from the non-magnetic particles.

Here, as shown in FIG. 5, when particles of various particle sizes are mixed in the granular material a (black particles: ferromagnetic particles, white particles: non-magnetic particles), the large-diameter strong Magnetic particles are collected as magnetic deposits while embracing small and medium-sized non-magnetic particles. Since the magnetic force is proportional to the volume of the magnetic material, the larger ferromagnetic particles are attracted more strongly, so the large ferromagnetic particles can easily embrace the small and medium non-magnetic particles as described above. It will end up.
Because of such a phenomenon, in a process that requires high-purity and high-efficiency separation, for example, as shown in Patent Documents 1 to 3, the granular material to be treated is classified with a multistage sieve. A method of processing by particle size with a plurality of magnetic separators or temporarily storing by particle size and switching the processing particle size with one magnetic separator is used.

JP 09-75774 A JP 2000-37666 A JP 2006255553 A

However, for example, when it is necessary to process several tons to several tens of tons per hour as in the case of steelmaking slag, the above-described method has insufficient processing capacity. There is also a problem that the processing cost becomes high.
Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art and to separate a ferromagnetic particle from a powder containing the ferromagnetic particle with high separation efficiency and low cost. Is to provide.

The present inventors deposit powder particles in a state of particle size segregation on the conveyor belt so that the particle size becomes coarser toward the lower layer side, and supply the particle particles subjected to the particle size segregation to the magnetic force sorting unit. It was found that the phenomenon of embedding small and medium-sized non-magnetic particles by large-sized ferromagnetic particles as shown in FIG.
The present invention has been made on the basis of such findings and has the following gist.
[1] A pulley-type magnetic separator having a conveyor belt (1) and a magnet pulley (4) for holding the terminal end of the conveyor belt (1), and the magnetic pulley (4) constituting the magnetic separator (2) A separation method for separating the ferromagnetic particles from the powder (a) containing the ferromagnetic particles by magnetic separation,
On the conveyor belt (1), the granular material (a) is deposited in a state where the particle size is segregated so that the particle size of the entire deposition layer becomes coarser toward the lower layer side, and the granular material (a) is deposited on the conveyor belt (1). A method for separating a ferromagnetic material, wherein the magnetic particles of the magnetic pulley (4) act to separate the ferromagnetic particles from the non-magnetic particles when transported and discharged from the end of the conveyor belt.
[2] A rotary drum type magnetic separator having a rotary drum (5) constituting the magnetic separator (2), and a conveyor belt for discharging powder particles from the end of the conveyor belt to the top of the rotary drum (5) ( 1) is a separation method for separating ferromagnetic particles from a granular material (a) containing ferromagnetic particles by magnetic separation,
On the conveyor belt (1), the granular material (a) is deposited in a state where the particle size is segregated so that the particle size of the entire deposition layer becomes coarser toward the lower layer side, and the granular material (a) is deposited on the conveyor belt (1). Conveyed and discharged from the end of the conveyor belt to the upper part of the rotating drum (5), the magnetic force of the rotating drum (5) is applied to the discharged powder (a), and the ferromagnetic particles are converted into non-magnetic particles. 1. A method for separating a ferromagnetic material, comprising separating from

[3] In the separation method of [1] or [2] above, the sieve is configured such that the mesh opening of the sieve is gradually reduced above the conveyor belt (1) in the traveling direction of the conveyor belt (1). Place the device (3),
By supplying the granular material (a) to the sieving device (3) from the end of the side having the smallest sieve opening, the granular material (a) having passed through the sieving device is transferred to the conveyor belt (1). The method for separating a ferromagnetic material is characterized by depositing particles in such a manner that the particle size is segregated so that the particle size of the entire deposited layer becomes coarser toward the lower layer side.

[4] The method for separating a ferromagnetic material according to [3] , wherein the sieving device (3) is an inclined sieve or a rotary inclined sieve .

[5] A separation device for separating ferromagnetic particles from a powder (a) containing ferromagnetic particles by magnetic sorting,
A conveyor belt (1) that conveys powder particles (a) and a magnet pulley (4) that holds the end of the conveyor belt (1) are provided, and the magnet pulley (4) is conveyed by the conveyor belt (1). A pulley-type magnetic separator that constitutes the magnetic separator (2) of the granular material (a) that is discharged from the terminal end of the conveyor belt,
Comprising a sieve device (3) arranged above the conveyor belt (1) ,
The sieving device (3) is configured so that the sieve openings are gradually reduced in the traveling direction of the conveyor belt (1), and the granular material (a ) Separator for separating ferromagnetic material, characterized in that it has a supply part (30).
[6] A separation device for separating ferromagnetic particles from a powder (a) containing ferromagnetic particles by magnetic separation,
A conveyor belt (1) for conveying the powder (a);
A rotating drum (5) that constitutes a magnetic sorting unit (2) is provided, and the granular material (a) conveyed by the conveyor belt (1) is discharged from the terminal end of the conveyor belt to the upper part of the rotating drum (5). A rotating drum type magnetic separator,
Comprising a sieve device (3) arranged above the conveyor belt (1),
The sieving device (3) is configured so that the sieve openings are gradually reduced in the traveling direction of the conveyor belt (1), and the granular material (a ) Separator for separating ferromagnetic material, characterized in that it has a supply part (30).

[7] The separator for ferromagnetic material according to [5] or [6], wherein the sieve device (3) is an inclined sieve or a rotary inclined sieve .

  According to the present invention, ferromagnetic particles can be separated from a granular material containing ferromagnetic particles with high accuracy and high processing speed. That is, the separation efficiency can be greatly improved over the conventional method. In addition, since it is not necessary to provide a separate processing line for each particle size, high separation efficiency can be achieved at low cost.

Explanatory drawing which shows one Embodiment of the separation method of this invention The explanatory view which shows an example of more concrete embodiment about the separation method and device of the present invention. Explanatory drawing which shows the other example of more concrete embodiment about the separation method and apparatus of this invention Explanatory drawing which shows the other example of more concrete embodiment about the separation method and apparatus of this invention Explanatory drawing showing a conventional separation method

The separation method of the present invention is a separation method for separating ferromagnetic particles from a granular material a containing ferromagnetic particles by magnetic separation.
In the separation method of the present invention, the ferromagnetic particles are particles to be sorted as ferromagnetic materials in the magnetic force sorting unit, and the non-magnetic particles are particles to be sorted as non-magnetic materials in the magnetic force sorting unit, respectively. Point to. Therefore, it is preferable that the powder a is in a state in which all the ferromagnetic materials contained therein can be separated as a single substance, but the non-magnetic material is included as a part of the ferromagnetic particles, and a part of the non-magnetic particles. It is permissible for a ferromagnetic material to be included.
The detail of the granular material a which is a process target of this invention is mentioned later.

FIG. 1 shows an embodiment of the separation method of the present invention, in which a is a granular material (black particles: ferromagnetic particles, white particles: non-magnetic particles), 1 is a conveyor belt, and 2 is a magnetic force. It is a sorting section. In this embodiment, the conveyor belt 1 and the magnetic separator 2 are respectively configured by a conveyor belt and a magnet pulley of a pulley type magnetic separator. That is, in the pulley type magnetic separator, one pulley holding the conveyor belt constitutes the magnet pulley 4, but in the present embodiment, this magnet pulley 4 constitutes the magnetic separator 2. In the circumferential direction inside the magnet pulley 4, magnetic poles (permanent magnets) having different polarities are alternately arranged. This magnetic pole is a fixed magnet that is fixedly installed independently from the rotatable pulley body. In this pulley type magnetic separator, when the granular material a containing ferromagnetic particles is supplied onto the conveyor belt 1 from a supply device (not shown), the granular material a is discharged from the conveyor terminal portion 10. Then, the magnetic force of the magnet pulley 4 is applied to separate the ferromagnetic particles from the non-magnetic particles.
The configuration of the magnet pulley 4 can take various forms other than the present embodiment. For example, a magnet roll (with different polarities in the roll circumferential direction) that is driven to rotate independently of the pulley body inside the pulley body. Magnetic poles (permanent magnets) spaced apart in the circumferential direction inside the magnet pulley 4 and magnetic poles of different polarities alternately in the pulley barrel length direction. Various types can be used such as lined-up items.

  In the separation method of the present invention, the granular material a is deposited on the conveyor belt 1 in a state of particle size segregation such that the particle size becomes coarser on the lower layer side (hereinafter sometimes simply referred to as “particle size segregated state”), The granular material a is conveyed by the conveyor belt 1 and supplied to the magnetic force sorting unit 2. As a method of depositing the granular material a in a state of being segregated on the conveyor belt 1, it is most convenient to use a sieve device having a special configuration as shown in an embodiment described later, but is not limited thereto. For example, the granular material a is classified in advance into a plurality of particle size levels, and sequentially loaded onto the conveyor belt 1 from the granular material a having a large particle size, thereby realizing the above-described segregated state of particle size. May be.

  The granular material a deposited on the conveyor belt 1 is conveyed by the conveyor belt 1 and supplied to the magnetic sorting unit 2, and the ferromagnetic particles are attracted by the magnetic force of the magnetic sorting unit 2, so that the non-magnetic particles are extracted. To be separated. In this embodiment, when the granular material a is paid out from the conveyor terminal part 10, the magnetic force of the magnet pulley 4 which comprises the magnetic force selection part 2 acts. Here, since the magnitude of the magnetic force acting on the ferromagnetic particles in the magnetic force selector 2 is proportional to the particle volume, the coarser (larger diameter) ferromagnetic particles are attracted more strongly. The granular material a supplied to the magnetic force sorting unit 2 is in a state where the particle size is segregated so that the particle size becomes coarser toward the lower layer side, that is, the “rough particle size ferromagnetic material particle” whose acting magnetic force becomes larger. Since they are in a segregated state, the lower-layer-side “coarse-grained ferromagnetic particles” are first attracted by a magnetic force, and the upper-layer-side finer ferromagnetic particles are successively attracted. Therefore, it is possible to suppress the phenomenon in which the large-diameter ferromagnetic particles as shown in FIG. 5 embed the small / medium non-magnetic particles. It is possible to prevent the magnetic particles from being collected as a magnetic deposit.

  As described above, the magnetic particle sorting unit 2 can separate the ferromagnetic particles and the non-magnetic particles with high accuracy. That is, in the conveyor terminal part 10, the powder a is sent along the arc of the magnetic separator 2 (magnet pulley 4) as the conveyor belt 1 moves, but the non-magnetic particles are attracted to the magnetic separator 2. Since it is not performed, it immediately leaves the magnetic sorting unit 2 and falls to the front of the magnetic sorting unit 2. On the other hand, the ferromagnetic particles are attracted to the magnetic force sorting unit 2 and sent by the conveyor belt 1, and then fall below the magnetic force sorting unit 2 due to gravity when the influence of the magnetic field disappears.

Here, as the state of particle size segregation such that the particle size becomes coarser on the lower layer side, the state in which the particle size is continuously changed in the layer thickness direction of the granular material a, the state in which the particle size is changed in a stepwise manner, and the state where both are mixed Either of these may be used. Further, in any state, inevitable variation in particle size (for example, when a small amount of particles inevitably small in size is included in the lower layer side having a coarse particle size) is allowed.
In addition to the pulley type magnetic separator (magnet pulley), a rotary drum type magnetic separator can be used as the magnetic separator 2.

  FIG. 2 shows an example of a more specific embodiment of the separation method and apparatus of the present invention. In this embodiment, a sieve opening (screen) is provided above the conveyor belt 1. 1 is arranged such that the sieve device 3 is configured so as to gradually become smaller in the direction of travel of 1, and the granular material a is supplied to the sieve device 3 from the end portion on the side where the mesh opening of the sieve is the smallest. Thus, the granular material a that has passed through the sieve is deposited on the conveyor belt 1 in a state where the particle size is segregated so that the particle size becomes coarser toward the lower layer side.

The separation device includes a conveyor belt 1 that conveys the granular material a, a sieving device 3 that is disposed above the conveyor belt 1, and a magnetic separator that is supplied with the granular material a that is conveyed by the conveyor belt 1. 2 is provided. The sieve device 3 is configured such that the sieve openings (screens) are gradually reduced in the direction of travel of the conveyor belt 1 and at the end portion on the side where the sieve openings are the smallest. It has the supply part 30 of the body a.
The sieving device 3 of the present embodiment is configured by a vibration type inclined sieve (inclined vibrating sieve). The inclined sieve is disposed at the upper position of the conveyor belt 1 along the longitudinal direction of the conveyor belt, is inclined downward toward the conveyor starting end 11, and the upper end side is the supply unit 30. In this sieving device 3, the sieve openings (screens) are sequentially reduced in three stages toward the direction of travel of the conveyor belt 1, but may be reduced in multiple stages or successively successively. .

In this embodiment, when the granular material a is supplied to the sieving device 3 from the supply unit 30 (the end on the side where the mesh opening of the sieving is the smallest), the granular material a having a coarser particle size Since it is inserted on the conveyor belt 1 at a more upstream side position, the granular material a accumulates in a state of particle size segregation so that the particle size becomes coarser toward the lower layer side.
The granular material a deposited on the conveyor belt 1 is transported by the conveyor belt 1 and supplied to the magnetic sorting unit 2, and the ferromagnetic material is generated by the magnetic force of the magnetic sorting unit 2 according to the principle described in the embodiment of FIG. The particles are separated from the non-magnetic particles by being attracted.

FIG. 3 shows another example of a more specific embodiment of the separation method and apparatus of the present invention. In this embodiment, the sieving device 3 is constituted by a rotating inclined screen (trommel screen). is there. The rotary inclined sieve is disposed in the upper position of the conveyor belt 1 along the longitudinal direction of the conveyor belt, is inclined downward toward the conveyor starting end 11, and the upper end side is the supply unit 30. In this sieving device 3, the sieve openings (screens) are sequentially reduced in three stages toward the direction of travel of the conveyor belt 1, but may be reduced in multiple stages or successively successively. . This rotating inclined sieve is driven to rotate about its cylindrical core.
Since other configurations are the same as those of the embodiment of FIG. 2, the same reference numerals are given, and detailed descriptions thereof are omitted.

Also in the present embodiment, when the granular material a is supplied to the sieving device 3 from the supply unit 30 (the end portion on the side where the mesh opening of the sieving is the smallest), the coarser granular material a becomes closer to the conveyor belt 1. Since it is inserted on the conveyor belt 1 at a more upstream side position, the granular material a accumulates in a state of particle size segregation so that the particle size becomes coarser toward the lower layer side.
The granular material a deposited on the conveyor belt 1 is transported by the conveyor belt 1 and supplied to the magnetic sorting unit 2, and the ferromagnetic material is generated by the magnetic force of the magnetic sorting unit 2 according to the principle described in the embodiment of FIG. The particles are separated from the non-magnetic particles by being attracted.

FIG. 4 shows another example of a more specific embodiment of the separation method and apparatus of the present invention. In this embodiment, the magnetic separator 2 is a rotating drum type magnetic separator (rotating drum 5). It is composed of The independent conveyor belt 1 is disposed so that the conveyor terminal portion 10 is close to the upper portion of the rotating drum 5 constituting the magnetic force sorting portion 2, and the conveyed granular material a is supplied (dispensed) to the upper portion of the rotating drum 5. I can do it. The rotating drum 5 constituting the magnetic force sorting unit 2 includes a magnet (permanent magnet) inside. In this embodiment, when the granular material a on the conveyor belt 1 is dispensed from the conveyor terminal portion 10 to the upper portion of the rotating drum 5, the magnetic force of the rotating drum 5 is applied to remove the ferromagnetic particles from the nonmagnetic particles. To separate.
Since other configurations are the same as those of the embodiment of FIG. 2, the same reference numerals are given, and detailed descriptions thereof are omitted.

Also in the present embodiment, when the granular material a is supplied to the sieving device 3 from the supply unit 30 (the end portion on the side where the mesh opening of the sieving is the smallest), the coarser granular material a becomes closer to the conveyor belt 1. Since it is inserted on the conveyor belt 1 at a more upstream side position, the granular material a accumulates in a state of particle size segregation so that the particle size becomes coarser toward the lower layer side.
The granular material a deposited on the conveyor belt 1 is transported by the conveyor belt 1 and supplied to the magnetic sorting unit 2 (rotating drum 5), and the magnetic sorting is performed according to the same principle as described in the embodiment of FIG. The ferromagnetic particles are attracted by the magnetic force of the portion 2 to be separated from the non-magnetic particles. Although the granular material a delivered from the conveyor terminal 10 is sent along the arc of the magnetic separator 2 (rotating drum 5), since the non-magnetic particles are not attracted to the magnetic separator 2, the magnetic separator immediately. It moves away from the part 2 and falls in front of the magnetic force sorting part 2. On the other hand, after the ferromagnetic particles are attracted to the magnetic force sorting unit 2 and sent, the magnetic particles fall below the magnetic force sorting unit 2 due to gravity when the influence of the magnetic field disappears.

  The sieving device 3 used in the present invention is not limited to the above-described embodiment, as long as it can deposit the granular material a in a state of being segregated on the conveyor belt 1. Therefore, the sieving device 3 has a screen-like chute (sieving) used as a segregation charging device (for example, JP-A-2005-291537), that is, substantially parallel to the width direction of the conveyor belt. An inclined chute configured in a screen shape by arranging a plurality of rods or wires in parallel at intervals, and using a screen-like chute (screen) in which the distance between adjacent rods or wires is narrowed toward the upper side of the chute May be.

Moreover, in each embodiment mentioned above, although the granular material a which passed the sieving apparatus 3 is directly dropped (charged) on the conveyor belt 1 as it is, the granular material a which passed the sieving apparatus 3 is used. It may be dropped (charged) onto the conveyor belt 1 via a chute or the like.
Although there is no special restriction | limiting in the granular material a used as the process target by this invention, For example, slag, such as iron manufacture slag, iron ore tailing, etc. are mentioned. Especially, this invention is suitable for isolation | separation of the ferromagnetic material (iron content) in slag (especially steelmaking slag, such as hot metal pretreatment slag, converter decarburization slag). The granular material a is preferably sufficiently crushed and pulverized in advance so that the ferromagnetic material can be separated as much as possible.

In the example of the present invention, using an apparatus configuration as shown in FIG. 2, iron separation (magnetic force sorting) was performed for steelmaking slag (particle size distribution: 1 to 30 mm) crushed so as to be separated as a single substance. The iron concentration of this steelmaking slag was 20 mass%.
The sieve mesh of the inclined vibration sieve constituting the sieving device 3 was made into three stages of 5 mm, 10 mm and 40 mm so that the steelmaking slag was charged in a state of segregation on the conveyor belt 1 in the particle size. The thickness of the steelmaking slag charged onto the conveyor belt 1 from the sieving device 3 was 12 mm. Moreover, the feed speed of the conveyor belt 1 was 3 m / s.

The magnetic separation unit 2 of the separation device is composed of a magnet pulley (outer diameter: 300 mm) of a pulley type magnetic separation unit, and the magnetic flux density is 0.2 T on the belt surface.
Further, as a comparative example, the iron separation process (magnetic force selection) was performed without using the sieving device 3 except that the other conditions were the same as those of the example of the present invention.
In the above-mentioned examples of the present invention and comparative examples, the iron concentration and the iron recovery rate from the slag were investigated. The results are shown in Table 1.
The magnetically collected material of the comparative example has a low iron concentration because it contains a non-ferrous component, and also has a low iron recovery rate from the slag because iron has escaped to the non-magnetic side. On the other hand, in the example of the present invention, extremely high values are obtained for both the iron concentration of the magnetically collected material and the iron recovery rate from the slag.

a Granules 1 Conveyor belt 2 Magnetic sorting unit 3 Sieve device 4 Magnet pulley 5 Rotating drum 10 Conveyor terminal unit 11 Conveyor starting end unit 30 Supply unit

Claims (7)

A pulley-type magnetic separator comprising a conveyor belt (1) and a magnet pulley (4) that holds the terminal end of the conveyor belt (1), the magnetic pulley (4) constituting a magnetic separator (2), A separation method for separating ferromagnetic particles from a powder (a) containing ferromagnetic particles by magnetic separation,
On the conveyor belt (1), the granular material (a) is deposited in a state where the particle size is segregated so that the particle size of the entire deposition layer becomes coarser toward the lower layer side, and the granular material (a) is deposited on the conveyor belt (1). A method for separating a ferromagnetic material, wherein the magnetic particles of the magnetic pulley (4) act to separate the ferromagnetic particles from the non-magnetic particles when transported and discharged from the end of the conveyor belt. A rotating drum type magnetic separator having a rotating drum (5) constituting a magnetic separator (2), and a conveyor belt (1) for discharging powder particles from the terminal end of the conveyor belt to the upper portion of the rotating drum (5). A separation method for separating the ferromagnetic particles from the powder (a) containing the ferromagnetic particles by using magnetic force sorting,
On the conveyor belt (1), the granular material (a) is deposited in a state where the particle size is segregated so that the particle size of the entire deposition layer becomes coarser toward the lower layer side, and the granular material (a) is deposited on the conveyor belt (1). Conveyed and discharged from the end of the conveyor belt to the upper part of the rotating drum (5), the magnetic force of the rotating drum (5) is applied to the discharged powder (a), and the ferromagnetic particles are converted into non-magnetic particles. 1. A method for separating a ferromagnetic material, comprising separating from Arranged above the conveyor belt (1) is a sieve device (3) configured such that the mesh opening of the sieve becomes smaller in the direction of travel of the conveyor belt (1),
By supplying the granular material (a) to the sieving device (3) from the end of the side having the smallest sieve opening, the granular material (a) having passed through the sieving device is transferred to the conveyor belt (1). 3) The method for separating a ferromagnetic material according to claim 1 or 2, wherein the particles are deposited in a state of particle size segregation so that the particle size of the entire deposited layer becomes coarser toward the lower layer side.   4. The method for separating a ferromagnetic material according to claim 3, wherein the sieving device (3) is composed of an inclined sieve or a rotary inclined sieve. A separator for separating ferromagnetic particles from a powder (a) containing ferromagnetic particles by magnetic separation,
A conveyor belt (1) that conveys powder particles (a) and a magnet pulley (4) that holds the end of the conveyor belt (1) are provided, and the magnet pulley (4) is conveyed by the conveyor belt (1). A pulley-type magnetic separator that constitutes the magnetic separator (2) of the granular material (a) that is discharged from the terminal end of the conveyor belt,
Comprising a sieve device (3) arranged above the conveyor belt (1),
The sieving device (3) is configured so that the sieve openings are gradually reduced in the traveling direction of the conveyor belt (1), and the granular material (a ) Separator for separating ferromagnetic material, characterized in that it has a supply part (30). A separator for separating ferromagnetic particles from a powder (a) containing ferromagnetic particles by magnetic separation,
A conveyor belt (1) for conveying the powder (a);
A rotating drum (5) that constitutes a magnetic sorting unit (2) is provided, and the granular material (a) conveyed by the conveyor belt (1) is discharged from the terminal end of the conveyor belt to the upper part of the rotating drum (5). A rotating drum type magnetic separator,
Comprising a sieve device (3) arranged above the conveyor belt (1),
The sieving device (3) is configured so that the sieve openings are gradually reduced in the traveling direction of the conveyor belt (1), and the granular material (a ) Separator for separating ferromagnetic material, characterized in that it has a supply part (30).   The separator for ferromagnetic material according to claim 5 or 6, wherein the sieving device (3) comprises an inclined sieve or a rotary inclined sieve.

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