JP2018122218A - Magnetic force screening method and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a high-quality magnetized article by suppressing the inclusion of non-magnetizable particles due to magnetizable particles to precisely separate magnetizable particles from non-magnetizable particles when screening granular magnetic separation object by magnetic force.SOLUTION: In a state that a magnetic separation object A is mixed with agitation acceleration particles x consisting of magnetizable particles with a larger grain size than an average grain size of the magnetic separation object, they are screened by magnetic force. A large agitation force of the magnetic separation object A during magnetic force screening can be obtained by the agitation acceleration particles x with a large grain size mixed in the magnetic separation object A to accelerate agitation of the magnetic separation object A, so that the inclusion of non-magnetizable particles due to magnetizable particles in the magnetic separation object A can suitably be suppressed. This enables the precise separation of magnetizable particles from non-magnetizable particles to obtain a high-quality magnetized article.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a technique for magnetically sorting magnetically adherent particles from granular magnetically segregated objects, and in the case of sorting and recovering iron from steel slag generated in the steel manufacturing process, or in the mine from high-grade ore from iron ore. This technique is useful for sorting.

In many cases, industrial materials and industrial process by-products are a mixture of magnetic and non-magnetic materials. When removing the magnetic material in the mixture as a foreign substance or when collecting it as a resource, it is common to use a magnetic separator.
In the magnetic separator, a fixed magnet is arranged in the rotating drum (drum type), a magnet is arranged in the pulley of the belt conveyor (pulley type), and a magnet is arranged inside the belt track of the belt conveyor. There is a type (hanging type) for lifting magnetically selected objects, and it is widely used in the industrial field.
In general, many of the objects to be magnetically sorted are crushed and pulverized to a predetermined particle size or less, and are put into a magnetic particle sorter (powder) having a particle size adjusted.

  Steel slag generated in the steelmaking process in the steelmaking process contains about 20 to 50 mass% of iron, and iron is separated from the steel slag and recycled in the steelmaking and steelmaking process. As a method for separating iron from slag, the above-described magnetic separation is generally used. However, in the case of a small particle size (0-5 mm) such as slag powder, when it is attempted to process in large quantities, it becomes a multilayered state ( Since the magnetically adherent particles (magnetic material) are magnetized in a dumpling shape so as to embrace the non-magnetically adherent particles (nonmagnetic material) There is a problem that the amount of non-magnetic particles contained in the particles increases and the magnetic separation quality decreases.

Conventionally, several proposals have been made to solve such problems.
For example, Patent Document 1 proposes a method in which a magnetically selected object is passed through a spiral slider and a non-magnetic material is peeled off from the magnet side by centrifugal force from the center.
Further, in Patent Document 2, in a method using a suspended magnetic separator equipped with a magnet, a method of preventing entrainment of non-magnetized objects by increasing the distance between the raw material supply conveyor and the magnet. Has been proposed.

JP-A-7-155539 JP 2004-351858 A

However, as in Patent Document 1, in the method of separating the non-magnetizable particles from the magnet side by centrifugal force, the centrifugal force acts on the magnetized particles in the same manner as the non-magnetized particles, and the magnetic force is applied to the non-magnetized side. There is a problem of loss of adherent particles.
Also, as in Patent Document 2, in the method of increasing the distance from the magnet and adsorbing the magnetically adherent particles, if the raw material is supplied in a multi-layered state (a state in which the layer thickness is large), There is a problem that the conductive particles are embraced by the non-magnetic particles and lost to the non-magnetic side.

  Accordingly, an object of the present invention is to solve the above-described problems of the prior art and suppress the inclusion of non-magnetizable particles by magnetically adhering particles in a method for magnetically selecting granular magnetically selected objects. An object of the present invention is to provide a method capable of obtaining a high-quality magnetic deposit by accurately separating particles and non-magnetic particles. Another object of the present invention is to provide an apparatus suitable for carrying out such a magnetic force sorting method.

  As a result of repeated studies to solve the above problems, the present inventors mixed stirring promoting particles made of magnetically adhering particles having a particle size larger than the average particle size of the magnetically selected object into the magnetically selected object. Thus, it was found that the magnetic adhesion selection of the magnetically segregated object appropriately suppresses the inclusion of the non-magnetizable particles by the magnetically segregated object, and the magnetic and non-magnetizable particles can be separated with high accuracy.

The present invention has been made on the basis of such findings and has the following gist.
[1] In the method of magnetically selecting a granular magnetic separation object (A), the magnetic separation object (A) is made of magnetically adhering particles having a particle diameter larger than the average particle diameter of the magnetic separation object (A). A magnetic force selection method comprising mixing magnetic particles after promoting particles (x) are mixed.
[2] In the magnetic field selection method of [1] above, the magnetic material (a) obtained by magnetically selecting the magnetic separation object (A) has an opening larger than the average particle diameter of the magnetic separation object (A). A magnetic force sorting method characterized by sieving with a sieve and using magnetically adherent particles on the sieve as stirring promoting particles (x).

[3] The magnetic force sorting method according to [1] or [2], wherein the magnetic force sorting means is any one of a pulley type magnetic sorter, a drum type magnetic sorter, and a suspended magnetic sorter. Magnetic sorting method.
[4] In an apparatus for magnetically selecting a granular magnetic separation object (A), the magnetic particle selection means (1) and the magnetic separation object (A) have a particle diameter larger than the average particle diameter of the magnetic separation object (A). A magnetic separation device comprising: charging means (2) for charging the magnetic separation means (1) after mixing the stirring promoting particles (x) made of magnetically adherent particles.

[5] In the magnetic separator of [4] above, the magnetic article having an opening larger than the average particle diameter of the magnetic separation object (A) and obtained by magnetic separation of the magnetic separation object (A) A sieve device (3) for sieving (a) and a supply means (4) for supplying magnetically adherent particles on the sieve in the sieve device (3) as stirring promoting particles (x) to the charging means (2) A magnetic sorting device characterized by comprising:
[6] In the magnetic separator according to [4] or [5], the magnetic separator (1) is any one of a pulley type magnetic separator, a drum type magnetic separator, and a suspended magnetic separator. A magnetic separator.
[7] Iron ore slag or iron ore, which is the magnetic selection object (A), is magnetically selected by the magnetic selection method according to any one of the above [1] to [3], and at least a part of the magnetic deposit (a) is made into iron. A method for producing a steelmaking raw material, which is recovered as a raw material.

According to the present invention, a large stirring force of the magnetic separation target A during magnetic separation is obtained by the stirring promoting particles x having a large particle size mixed with the magnetic separation target A, and the stirring of the magnetic separation target A is promoted. For this reason, the inclusion of non-magnetizable particles by the magnetically adherent particles in the magnetically selected object A is appropriately suppressed. For this reason, magnetically adherent particles and non-magnetically adherent particles can be separated with high accuracy to obtain a high-quality magnetized product. In addition, since the magnetic force can be selected even if the processing amount increases, the processing amount can be dramatically increased as compared with the conventional method.
Further, the magnetic adherend a obtained by magnetically sorting the magnetic separation object A is sieved with a sieve having an opening larger than the average particle diameter of the magnetic separation object A, and stirring of the magnetic adherent particles on the sieve is promoted. By reusing as the particles x, the consumption of the stirring promoting particles x can be suppressed, and the magnetic force sorting can be performed at a low cost.

Explanatory drawing which shows typically one Embodiment of this invention Explanatory drawing schematically showing the principle of magnetic sorting by the method of the present invention Explanatory drawing schematically showing the situation in which the embrace phenomenon occurs in the magnetic separation of the conventional method Explanatory drawing which shows other embodiment of this invention typically Explanatory drawing which shows other embodiment of this invention typically Explanatory drawing which shows other embodiment of this invention typically Explanatory drawing which shows other embodiment of this invention typically

FIG. 1 is an explanatory view schematically showing an embodiment of the magnetic force sorting method and apparatus according to the present invention. The magnetic force sorting device includes a magnetic force sorting means 1 comprising a pulley type magnetic sorter and the magnetic force sorting means 1. 1 has a charging means 2 for charging the magnetic separation object A.
The magnetic force sorting means 1 comprises a pulley type magnetic force sorter in which a conveyor belt 6 is stretched between a magnet pulley 5a and a pulley 5b. In the pulley type magnetic separator according to the present embodiment, the magnet pulley 5a is a pulley on the conveyor end side, and the magnetically selected object A supplied to the conveyor belt 6 from above and conveyed by the conveyor belt 6 is on the conveyor end side. When paying out, the magnetic pulley 5a selects the magnetic force.

  The magnet pulley 5a includes a rotatable pulley body 7 that constitutes a pulley outer shell and guides the conveyor belt 6, and a fixed magnet 8 disposed inside the pulley body 7. The magnet 8 includes: It is provided independently from the pulley body 7. The magnet 8 includes a plurality of poles (for example, 12 poles) in which N poles and S poles are alternately arranged along a pulley half circumference around which the conveyor belt 6 is wound. It is preferable that the magnetic force of the magnetic force selection part by the magnet pulley 5a is, for example, about 1000 Gauss on the belt surface.

The pulley 5b is a general pulley (that is not a magnet pulley) that guides the conveyor belt 6. Normally, the pulley 5b serves as a driving pulley, and the pulley body 7 of the magnet pulley 5a serves as a driven pulley that freely rotates.
The charging means 2 includes an electromagnetic feeder 9 having a hopper 10, and a magnetically selected object A put in the hopper 10 is supplied onto the conveyor belt 6 by the electromagnetic feeder 9.
Below the magnet pulley 5a, there is provided a partition 11 for partitioning each fall space between the magnetically attached material and the non-magnetically attached material.

In the present invention, the magnetically segregated object A is mixed with stirring promoting particles x made of magnetically adherent particles having a particle size larger than the average particle size of the magnetically segregated object A. The hopper 10 is charged with the magnetic separation object A and the stirring promoting particles x from two supply systems such as a belt conveyor, and is mixed in the hopper 10. The magnetic selection object A in which the stirring promoting particles x are mixed in this way is loaded from the electromagnetic feeder 9 into the magnetic selection unit 1 (pulley type magnetic selection machine) and subjected to magnetic selection.
Here, the average particle diameter of the magnetically selected object A is an arithmetic average value of particle diameters, and a particle size distribution is obtained by a sieving method, and is expressed by a sieve opening from mass% for each particle size.
In addition, the particle size of the stirring promoting particles x larger than the average particle size of the magnetic separation object A is, for example, a particle that becomes on the sieve when passing through a sieve having an opening larger than the average particle diameter of the magnetic separation object A It means having a diameter.

Although there is no special restriction | limiting in the mixing amount with respect to the magnetic separation target A of the stirring promotion particle x, a viewpoint of the stirring promotion effect of the magnetic separation target A in a magnetic selection part, ensuring of the processing amount of the magnetic separation target A, and stirring promotion particle | grains From the viewpoint of the cost of x and the like, the mixing amount of the stirring promoting particles x is preferably about 1 to 30 mass% of the amount of the magnetic separation target A.
The particle size of the stirring promoting particles x is not particularly limited, but if the particle size is too large, the stirring promoting particles x may be difficult to move and the stirring promoting effect may be reduced. It is preferable to be about 20 times or less of the particle size.

FIG. 2 schematically shows the principle of magnetic sorting according to the method of the present invention, taking the embodiment of FIG. 1 as an example, and FIG. 3 schematically shows the situation in which the embrace phenomenon occurs in the magnetic sorting of the conventional method. It is shown in.
When the magnetic separation object A having a granular shape is magnetically sorted by the conventional method, a phenomenon occurs in which the magnetically adherent particles embed non-adherent particles as shown in FIG. It will be mixed into the magnetized side. On the other hand, the magnetic selection object A moves in a non-uniform magnetic field when passing through the magnetic selection unit, so that the magnitude and direction of the magnetic field change when viewed from the magnetically adherent particles (magnetic material). When the magnitude and direction of the magnetic field acting on the magnetic particles change, the magnitude and direction of the magnetic force acting on the magnetic particles change, so microscopically, the magnetic particles themselves undergo movements such as vibration and rotation. Arise. When this vibration and rotation occur while the embracing phenomenon is occurring, macroscopically the granular magnetically selected object A is agitated, and the embraced non-magnetic particles (non-magnetic material) are released, Separation by magnetic sorting occurs correctly. In the present invention, as shown in FIG. 2, the magnetically segregated object A is composed of magnetically adherent particles having a large particle diameter (magnetically adherent particles having a particle diameter larger than the average particle diameter of the magnetically segregated object A). The agitation promoting particles x greatly move in the magnetic field to promote the agitation as described above. As a result, the inclusion of the non-magnetizable particles by the magnetically adherent particles is effectively eliminated, and the magnetically adherent particles and Non-magnetizable particles can be separated with high accuracy to obtain a high-quality magnetized product.

FIG. 4 is an explanatory view schematically showing another embodiment of the magnetic force sorting method and apparatus of the present invention. This magnetic force sorting apparatus is also composed of a magnetic force sorting means 1 comprising a pulley type magnetic sorter and the magnetic force sorting means. 1 has a charging means 2 for charging a magnetically segregated object A, but a magnet pulley 5a forms a pulley outer shell and guides a conveyor belt 6, and a pulley main body 12 inside the pulley main body 12 And a magnet roll 13 that rotates independently of the pulley body 12. The magnet of the magnet roll 13 is composed of a plurality of poles (for example, 24 poles) in which N poles and S poles are alternately arranged along the entire circumference of the pulley. It is preferable that the magnetic force of the magnetic force selection part by the magnet pulley 5a is, for example, about 2500 Gauss on the belt surface. The direction in which the magnet roll 13 is rotationally driven may be the same direction as the pulley body 12 or the opposite direction. The configuration of the pulley type magnetic separator as described above is known as shown in FIG. 7 of the republished patent WO2014 / 061256, for example.
Since other configurations are the same as those of the embodiment of FIG. 1, the same reference numerals are given, and detailed descriptions thereof are omitted.

  Also in the present embodiment, similarly to the embodiment of FIG. 1, the magnetically segregated object A and the stirring promoting particles x are introduced into the hopper 10 from the two supply systems, and are mixed in the hopper 10 as described above. The magnetic separation object A mixed with the stirring promoting particles x is inserted from the electromagnetic feeder 9 into the magnetic separation unit 1 (pulley type magnetic separation unit) and subjected to magnetic separation. At that time, since the stirring promoting effect as described above by the stirring promoting particles x is obtained, the inclusion of the non-magnetizing particles by the magnetizing particles is effectively eliminated, and the magnetizing particles and the non-magnetizing particles are eliminated. Can be separated with high accuracy to obtain a high-quality magnetized product.

FIG. 5 is an explanatory view schematically showing another embodiment of the magnetic force sorting method and apparatus of the present invention. This magnetic force sorting apparatus includes a magnetic force sorting means 1 comprising a drum type magnetic sorter and the magnetic force sorting means. 1 has a charging means 2 for charging the magnetic separation object A.
In the drum type magnetic separator as the magnetic separator 1, a fixed magnet 16 is provided independently of the drum main body 15 inside a rotatable drum main body 15 (outer shell) constituting the rotary drum. . The magnet 16 includes a plurality of poles (for example, 12 poles) in which N poles and S poles are alternately arranged along the half circumference of the drum on which the magnetic selection object A slides. It is preferable that the magnetic force of the magnetic force sorting unit by the rotating drum 14 is, for example, about 600 Gauss on the drum surface.
Since other configurations are the same as those of the embodiment of FIG. 1, the same reference numerals are given, and detailed descriptions thereof are omitted.

  Also in the present embodiment, similarly to the embodiment of FIG. 1, the magnetically segregated object A and the stirring promoting particles x are introduced into the hopper 10 from the two supply systems, and are mixed in the hopper 10 as described above. The magnetic separation object A mixed with the stirring promoting particles x is loaded from the electromagnetic feeder 9 into the magnetic separation unit 1 (drum type magnetic separation unit) and subjected to magnetic separation. At that time, since the stirring promoting effect as described above by the stirring promoting particles x is obtained, the inclusion of the non-magnetizing particles by the magnetizing particles is effectively eliminated, and the magnetizing particles and the non-magnetizing particles are eliminated. Can be separated with high accuracy to obtain a high-quality magnetized product.

FIG. 6 is an explanatory view schematically showing another embodiment of the magnetic sorting method and apparatus of the present invention. This magnetic sorting apparatus includes a magnetic sorting means 1 comprising a suspended magnetic sorting machine, and this magnetic sorting. The means 1 has the charging means 2 for charging the magnetic separation object A.
The suspension type magnetic separator as the magnetic separator 1 is a suspension type magnetic separator similar to the embodiment shown in FIG. 4, and a conveyor belt 18 is stretched between the magnet pulley 17a and the pulley 17b. It is a magnetic separator.

The charging means 2 includes a belt conveyor 19 that conveys the magnetic selection object A to a position below the magnet pulley 17 a, and an electromagnetic feeder 20 and a hopper 21 that supply the magnetic selection object A onto the belt conveyor 19.
In the suspended magnetic separator of this embodiment, the magnet pulley 17a is a pulley on the conveyor start end side, and the magnetic selection object A supplied from below by the belt conveyor 19 is magnetically selected by the magnet pulley 17a. At that time, the non-magnetized material is discharged from the belt conveyor 19 without being attracted to the magnet pulley 17a and falls downward, and the magnetized material is conveyed by the conveyor belt 18 while being attracted to the magnet pulley 17a. And is paid out to the magnetized material collection unit 22 at the end of the conveyor.

  Similar to the magnet pulley 5a of FIG. 4, the magnet pulley 17a of the present embodiment also forms a pulley outer shell, and is provided inside the pulley body 23 and the pulley body 23 that guides the conveyor belt 18. A magnet roll 24 is provided that is independently rotated. The magnet of the magnet roll 24 includes a plurality of poles (for example, 24 poles) in which N poles and S poles are alternately arranged along the entire circumference of the pulley. The magnetic force of the magnetic force selection part by the magnet pulley 17a is preferably about 2000 Gauss on the belt surface, for example. The direction in which the magnet roll 24 is rotationally driven may be the same direction as the pulley body 23 or the opposite direction. The structure of such a suspension type pulley type magnetic separator is known, for example, as shown in FIG. 2 of the republished patent WO2014 / 061256.

  Also in the present embodiment, similarly to the embodiment of FIG. 1, the magnetic separation object A and the stirring promoting particles x are introduced into the hopper 21 from the two supply systems, and are mixed in the hopper 21 as described above. The magnetically segregated object A mixed with the stirring promoting particles x is loaded from the electromagnetic feeder 20 onto the belt conveyor 19, and is then transported to a position below the magnet pulley 17 a of the magnetic force sorting means 1 by the belt conveyor 19. Is done. At that time, since the stirring promoting effect as described above by the stirring promoting particles x is obtained, the inclusion of the non-magnetizing particles by the magnetizing particles is effectively eliminated, and the magnetizing particles and the non-magnetizing particles are eliminated. Can be separated with high accuracy to obtain a high-quality magnetized product.

FIG. 7 is an explanatory view schematically showing another embodiment of the magnetic sorting method and apparatus of the present invention. This magnetic sorting apparatus is similar to the embodiment of FIG. Means 1 and means 2 for inserting the magnetic separation object A into the magnetic separation means 1, and further, a sieve device 3 having an opening larger than the average particle diameter of the magnetic separation object A; , And supply means 4 for supplying the particles on the sieve of the sieving device 3 to the charging means 2.
Since other configurations are the same as those of the embodiment of FIG. 4, the same reference numerals are given, and detailed descriptions thereof are omitted.

In the present embodiment, the magnetic material a obtained by magnetically selecting the magnetic separation object A is screened by the sieve device 3 having an opening larger than the average particle diameter of the magnetic separation object A, and the magnetic adhesion on the sieve. The characteristic particles are supplied to the charging means 2 (hopper 10) by the supply means 4 and reused as the stirring promoting particles x. Thus, it can implement at low cost by recycle | reusing (circulating utilization) the stirring acceleration | stimulation particle | grains x.
In addition, based on the principle of the method of the present invention as shown in FIG. 2, the present invention can be applied to various types other than the magnetic separator such as the above-described embodiments. The present invention can also be applied to a magnetic separator of a type (hanging type) in which magnets are arranged inside a belt track of a conveyor to lift a magnetic selection object.

  The magnetic separation method of the present invention described above is useful when sorting and recovering iron from steel slag generated in the steel manufacturing process or when sorting high-grade ore from iron ore in a mine. It is possible to magnetically sort steel slag and iron ore that are magnetic selection objects A, and to recover at least a part of the magnetic deposit a as a raw material for iron making.

[Example 1]
When the steelmaking slag (magnetic selection object A) having a particle size of 1 mm or less and an average particle size of 0.5 mm containing about 30 mass% of iron is magnetically sorted at a processing amount of 1 ton / h using the equipment shown in FIG. 0.7 to 1 mm of granular iron (agitation promoting particles x) was mixed with steelmaking slag at a rate of 0.1 ton / h. The magnetic force of the magnetic selection part was 1000 gausses on the belt surface. In this example, due to the stirring promotion effect of the granular iron (stirring promoting particles x) mixed with the steelmaking slag, the phenomenon of non-adherent particles held by the magnetically adhering particles in the steelmaking slag is greatly eliminated. In the conventional method in which granular iron (agitation promoting particles x) is not mixed, the recovery yield of non-magnetized substances is about 50 mass% due to the embracing phenomenon, whereas the recovery yield of non-magnetized substances is 90 mass% or more. The yield of kimono collection has been greatly improved.

[Example 2]
When using the equipment shown in FIG. 4 to separate the magnetic force of steelmaking slag (magnetic selection object A) having a particle size of 1 mm or less containing about 30 mass% of iron and an average particle size of 0.5 mm at a processing amount of 1 ton / h, 0.7 to 1 mm of granular iron (agitation promoting particles x) was mixed with steelmaking slag at a rate of 0.1 ton / h. The magnetic force of the magnetic selection unit was 2500 gauss on the belt surface. The equipment shown in FIG. 4 is a system aimed at stirring the magnetically selected object A more strongly by rotating the magnet roll 13, but the embrace phenomenon cannot be completely eliminated. In this example, due to the stirring promotion effect of the granular iron (stirring promoting particles x) mixed with the steelmaking slag, the phenomenon of non-adherent particles held by the magnetically adhering particles in the steelmaking slag is greatly eliminated. In the conventional method in which granular iron (agitation promoting particles x) is not mixed, the iron concentration in the magnetic deposit is about 70 mass% due to the embracing phenomenon, whereas the iron concentration in the magnetic deposit is 97 mass% or more, The quality was greatly improved.

[Example 3]
When the steelmaking slag (magnetic selection object A) having a particle size of 1 mm or less containing about 30 mass% of iron and having an average particle size of 0.5 mm is magnetically sorted at a processing amount of 1 ton / h using the equipment shown in FIG. More than 1.5 mm of granular iron (agitation promoting particles x) was mixed with steelmaking slag at a rate of 0.1 ton / h. The magnetic force of the magnetic selection unit was 600 gausses on the drum surface. In this example, due to the stirring promotion effect of the granular iron (stirring promoting particles x) mixed with the steelmaking slag, the phenomenon of non-adherent particles held by the magnetically adhering particles in the steelmaking slag is greatly eliminated. In the conventional method in which granular iron (agitation promoting particles x) is not mixed, the iron concentration in the magnetic deposit is about 70 mass% due to the embracing phenomenon, whereas the iron concentration in the magnetic deposit is 97 mass% or more, The quality was greatly improved.
Further, in this example, the obtained magnetic product a is sieved with a sieve having an opening of 1.5 mm, and the magnetic product on the sieve is re-introduced into the supply hopper of the magnetic separation target A as stirring promoting particles x ( The agitation promoting particles x were circulated and reused.

DESCRIPTION OF SYMBOLS 1 Magnetic selection means 2 Insertion means 3 Sieve apparatus 4 Supply means 5a Magnet pulley 5b Pulley 6 Conveyor belt 7 Pulley body 8 Magnet 9 Electromagnetic feeder 10 Hopper 11 Partition 12 Pulley body 13 Magnet roll 14 Rotating drum 15 Drum body 16 Magnet 17a Magnet Pulley 17b Pulley 18 Conveyor belt 19 Belt conveyor 20 Electromagnetic feeder 21 Hopper 22 Magnetic material collection part 23 Pulley body 24 Magnet roll A Magnetic selection object a Magnetic material x Stirring acceleration particles

Claims (7)

In the method of magnetically selecting the granular magnetic separation object (A),
The magnetic separation object (A) is mixed with stirring promoting particles (x) made of magnetically adherent particles having a particle diameter larger than the average particle diameter of the magnetic separation object (A), and then magnetic separation is performed. Magnetic sorting method.   The magnetic adherend (a) obtained by magnetically sorting the magnetic separation object (A) is sieved with a sieve having an opening larger than the average particle size of the magnetic separation object (A), and the magnetic adhesion on the sieve The method according to claim 1, wherein the particles are used as stirring promoting particles (x).   3. The magnetic sorting method according to claim 1, wherein the magnetic sorting means is any one of a pulley type magnetic sorting machine, a drum type magnetic sorting machine, and a hanging type magnetic sorting machine. In the apparatus for magnetically selecting the granular magnetic separation object (A),
Magnetic force sorting means (1);
The magnetic separation object (A) is mixed with stirring promoting particles (x) made of magnetically adherent particles having a particle size larger than the average particle diameter of the magnetic separation object (A), and then the magnetic separation means (1) is loaded. A magnetic separator having a charging means (2) for entering. Furthermore, a sieve device (3) having a mesh opening larger than the average particle size of the magnetically segregated object (A) and sieving the magnetically adhered object (a) obtained by magnetically sorting the magnetically segregated object (A) ,
Magnetic force according to claim 4, further comprising a supply means (4) for supplying magnetically adherent particles on the sieve in the sieving device (3) as stirring promoting particles (x) to the charging means (2). Sorting device.   6. The magnetic separator according to claim 4, wherein the magnetic separator (1) is any one of a pulley type magnetic separator, a drum type magnetic separator, and a suspended magnetic separator.   The steel slag or iron ore that is the magnetic separation object (A) is magnetically sorted by the magnetic separation method according to any one of claims 1 to 3, and at least a part of the magnetic deposit (a) is recovered as an iron-making raw material. The manufacturing method of the iron-making raw material characterized by the above-mentioned.

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