JP6662275B2 - Method and apparatus for magnetic separation of particulate matter - Google Patents

Description

  The present invention relates to a technology for magnetically separating magnetically adhering particles from granular materials including magnetically adhering particles, and in a case where iron is selectively recovered from steel slag generated in a steel manufacturing process, or in a mine where iron ore is highly separated. This is a useful technique when sorting high-grade ores.

  The iron and steel slag generated in the iron making and steel making process at the steel mill contains about 20 to 50% by mass of iron. If this steel slag is disposed of as it is, the iron yield in the steelmaking flow decreases, so iron is separated from the slag and recycled in the pig and steel making process. As a method of separating iron from slag, magnetic force separation using magnetism is generally used. However, in the case of slag powder having a small particle size (0-5 mm), multi-layer processing is attempted when mass processing is attempted. Since the treatment must be performed in a state (with a large layer thickness), (i) the magnetically adhering particles (magnetic material) embrace the non-magnetically adhering particles (non-magnetic material), and the iron concentration on the magnetically adhering side (Ii) there is a problem that the magnetically adherent particles in the lower layer are embraced by the non-magnetically adhered particles and iron is lost to the non-magnetically adhered side.

Conventionally, several proposals have been made to solve such a problem.
For example, Patent Literature 1 proposes a method in which an object to be sorted is passed through a spiral slider, and a non-magnetically attached object is peeled off from the magnet side by centrifugal force from the center.
Patent Document 2 discloses a method using a suspended magnetic separator equipped with magnets, in which the distance between the material supply conveyor and the magnets is increased to prevent entrapment of non-magnetically attached matter. Has been proposed.

JP-A-7-155639 JP-A-2004-351858

However, in the method of separating the non-magnetically adhering particles from the magnet side by the centrifugal force as in Patent Document 1, centrifugal force acts on the magnetically adhering particles in the same manner as the non-magnetically adhering particles, and the magnetically adhering particles are applied to the non-magnetically adhering side. There is a problem that adhesive particles are lost.
Also, in the technique of increasing the distance from the magnet and adsorbing the magnetically adhering particles, as in Patent Document 2, when the raw material is supplied in a multilayer state (a state in which the layer thickness is large), the lower layer is magnetized. There is a problem that the non-magnetic particles are entangled by the non-magnetic particles and are lost to the non-magnetic side.

  Therefore, an object of the present invention is to solve the problems of the prior art as described above, and in a method of magnetically separating magnetically adhering particles from granular materials including magnetically adhering particles, the method of non-magnetically adhering particles by the magnetically adhering particles. It is an object of the present invention to provide a method capable of accurately separating the magnetically adhering particles from the non-magnetically adhering particles while appropriately suppressing the inclusion and the inclusion of the magnetically adhering particles by the non-magnetically adhering particles. Another object of the present invention is to provide an apparatus suitable for performing such a magnetic force sorting method.

  As a result of repeated studies to solve the above problems, the present inventors have found the following new methods. That is, when a raw material (granular material containing magnetically adhering particles) is supplied to the belt conveyor, the raw material is allowed to fall freely, and a magnetic field is applied to the raw material during the fall by a magnetic field applying means. The falling trajectory of the particles is guided to the downstream side in the conveyor conveyance direction or the upstream side in the conveyor conveyance direction (the falling trajectory is displaced to the downstream side in the conveyor conveyance direction or the upstream side in the conveyor conveyance direction). Thereby, the raw material is deposited on the belt conveyor in a state where the magnetically adhered particles are segregated on the upper layer side or the lower layer side, and the magnetically adhered particles segregated on the upper side or the lower layer side of the raw material on the belt conveyor in this manner, Magnetic separation is performed by magnetic separation means having a magnetic separation function according to the segregation form (ie, segregation to the upper layer side or segregation to the lower layer side). In such a method, magnetically segregating the magnetically adhered particles segregated to the upper layer side or the lower layer side, so that the non-magnetically adhered particles are embraced by the magnetically adhered particles and the magnetically adhered particles are separated by the non-magnetically adhered particles. Entrapment is appropriately suppressed, and the magnetically adhering particles and the non-magnetically adhering particles can be accurately separated.

The present invention has been made based on such findings, and has the following gist.
[1] A method of magnetically separating magnetically adhering particles (x) from particulate matter (A) containing magnetically adhering particles (x),
The particulate matter (A) is dropped from above toward the belt conveyor (1), and is dropped by the magnetic field applying means (2) arranged downstream of the falling space in the conveyor conveyance direction or upstream of the conveyor conveyance direction. A magnetic field is applied to the granular material (A) of the above, and by applying the magnetic field, the falling trajectory of the main magnetically adherent particles (x) is guided to the downstream side in the conveyor transport direction or the upstream side in the conveyor transport direction, and the granular material (A) is By dropping on the belt conveyor (1), the particulate matter (A) is deposited on the belt conveyor (1) in a state where the magnetically adherent particles (x) are segregated on the upper layer side or the lower layer side,
The magnetic particles (x) segregated on the upper layer side or the lower layer side of the granular material (A) deposited and conveyed on the belt conveyor (1) are magnetically separated by a magnetic force separating means (3). Magnetic separation method for granular materials.

[2] In the magnetic force separation method according to the above [1], a granular material supply means (4) for supplying the granular material (A) above the belt conveyor (1) and dropping the granular material (A) freely toward the belt conveyor (1) is provided. Magnetic field applying means (2) is arranged facing the falling space of the particulate matter (A),
The granular material (A) supplied from the granular material supply means (4) is dropped freely toward the belt conveyor (1), and a magnetic field is applied to the granular material (A) during the fall by the magnetic field applying means (2). Applying a magnetic force to the particles.
[3] In the magnetic force sorting method of the above [1], the granular material supply means (4) for supplying the granular material (A) above the belt conveyor (1), and the granular material supply means (4) supplies the granular material (A). An inclined chute (5) for receiving and sliding down the granular material (A), and a magnetic field applying means (2) facing the falling space of the granular material (A) immediately below the lower end of the inclined chute (5). Is placed,
After the granular material (A) supplied from the granular material supply means (4) is received by the inclined chute (5) and slid down, it is dropped freely from the lower end of the inclined chute (5) toward the belt conveyor (1), A magnetic field sorting method, wherein a magnetic field is applied to the granular material (A) during the dropping by a magnetic field applying means (2).

[4] In the magnetic force separation method according to any one of the above [1] to [3], the magnetically adhering particles (x) segregated on the upper layer side of the granular material (A) deposited and conveyed on the belt conveyor (1). ) Is magnetically attracted to a magnetic force sorting means (3) disposed above the belt conveyor (1) to perform magnetic force sorting.
[5] In the magnetic force sorting method according to the above [4], the magnetic force sorting means (3) is configured such that the pulley on the side of the conveyor start end (30) is a magnet pulley (32), and the conveyor conveyance direction is the same as that of the belt conveyor (1). The pulley-type magnetic separator (3a) has a reverse direction, and the conveyor start end (30) of the pulley-type magnetic separator (3a) is positioned above the conveyor end (11) of the belt conveyor (1). A magnetic force sorting method for a granular material.
[6] In the magnetic force sorting method of the above [4], the magnetic force sorting means (3) includes a magnet plate (38) inside the conveyor belt (37) and is arranged in a direction intersecting the belt conveyor (1). A method for magnetically sorting granular materials, comprising a belt conveyor (3b).

[7] In the magnetic force sorting method according to any one of [1] to [3], the magnetically adhering particles (x) segregated on the lower layer side of the granular material (A) deposited and conveyed on the belt conveyor (1). ) Is magnetically attracted to a magnetic force sorting means (3) when the granular material (A) is discharged from the belt conveyor (1) to perform magnetic force sorting.
[8] In the magnetic separation method according to the above [7], the belt conveyor (1) comprises a pulley-type magnetic separator (1a) in which a pulley on the side of the conveyor end portion (11) is formed by a magnet pulley (16); A magnetic force sorting method, wherein the magnetic force sorting means (3) comprises a magnet pulley (16).
[9] In the magnetic separation method according to the above [7], the magnetic separation means (3) comprises a drum type magnetic separator (3c) arranged adjacent to the conveyor end portion (11) of the belt conveyor (1). A method for magnetically sorting granular materials, characterized in that:

[10] An apparatus for magnetically separating magnetically adhering particles (x) from granular matter (A) containing magnetically adhering particles (x),
A belt conveyor (1),
A granular material supply means (4) disposed above the belt conveyor (1), for supplying the granular material (A) and dropping the granular material (A) toward the belt conveyor (1);
The main magnetically adhering particles (x) are arranged by applying a magnetic field to the granular material (A) which is disposed on the downstream side in the conveyor transport direction or the upstream side in the conveyor transport direction from the space where the granular material (A) falls. A magnetic field applying means (2) for guiding the falling trajectory downstream in the conveyor conveyance direction or upstream in the conveyor conveyance direction;
A magnetic separation means (3) for magnetically separating magnetically adhering particles (x) segregated on the upper layer side or the lower layer side of the granular material (A) deposited and conveyed on the belt conveyor (1); Magnetic separation device for granular materials.

[11] In the magnetic force sorting apparatus according to the above [10], the magnetic field applying means facing the falling space of the granular material (A) supplied from the granular material supply means (4) and freely falling toward the belt conveyor (1). (2) A magnetic force sorting apparatus for granular materials, wherein (2) is arranged.
[12] The magnetic force sorting apparatus according to the above [10], further comprising an inclined chute (5) for receiving and sliding down the granular material (A) supplied from the granular material supply means (4), and a lower end of the inclined chute (5). A magnetic force sorting apparatus for a granular material, wherein a magnetic field applying means (2) is arranged facing a space where the granular material (A) falls immediately below.
[13] In the magnetic separation apparatus according to any one of [10] to [12], the magnetic separation means (3) is disposed above the belt conveyor (1), and is deposited on the belt conveyor (1) and transported. A magnetic force sorting device for magnetically adsorbing magnetically adhering particles (x) segregated on the upper layer side of the granular material (A) to be produced.

[14] In the magnetic separation apparatus according to [13], the magnetic separation means (3) is configured such that the pulley on the side of the conveyer starting end (30) is constituted by the magnet pulley (32), and the conveyor conveyance direction is the same as that of the belt conveyer (1). The pulley-type magnetic separator (3a) has a reverse direction, and the conveyor start end (30) of the pulley-type magnetic separator (3a) is positioned above the conveyor end (11) of the belt conveyor (1). A magnetic force sorting device for granular materials.
[15] In the magnetic force sorting apparatus according to the above [13], the magnetic force sorting means (3) includes the magnet plate (38) inside the conveyor belt (37) and is arranged in a direction intersecting with the belt conveyor (1). A magnetic separation device for granular materials, comprising a belt conveyor (3b).
[16] In the magnetic separation apparatus according to any one of the above [10] to [12], the magnetic separation means (3) is provided on a lower side of the granular material (A) deposited and conveyed on the belt conveyor (1). A magnetic separation device for a granular material, which is means for magnetically adsorbing the segregated magnetic particles (x) when discharging the granular material (A) from the belt conveyor (1).

[17] In the magnetic force sorting apparatus according to the above [16], the belt conveyor (1) comprises a pulley type magnetic force sorter (1a) in which the pulley on the side of the conveyor end portion (11) is constituted by a magnet pulley (16), A magnetic force sorting apparatus for granular materials, wherein the magnetic force sorting means (3) comprises a magnet pulley (16).
[18] In the magnetic force sorting device according to the above [16], the magnetic force sorting means (3) comprises a drum type magnetic force sorting machine (3c) arranged adjacent to the conveyor end portion (11) of the belt conveyor (1). A magnetic force sorting device for granular materials, characterized in that:
[19] The magnetically segregable particles (x) are magnetically segregated from the iron slag or iron ore, which is the granular material (A), by the magnetic segregation method according to any one of the above [1] to [9]. A method for producing a steelmaking raw material, comprising recovering (x) as a steelmaking raw material.

  According to the present invention, in a method for magnetically separating magnetically adhering particles from a granular material containing magnetically adhering particles, the method of embracing the non-magnetically adhering particles by the magnetically adhering particles, It is possible to accurately separate the magnetically adhering particles from the non-magnetically adhering particles by appropriately suppressing the inclusion of the particles. Therefore, high-grade iron can be separated and recovered at a high recovery rate from the steel slag generated in the steel manufacturing process, and high-grade ore can be separated and recovered at a mine at a high recovery rate from iron ore.

Schematic explanatory view showing one embodiment of the magnetic force sorting method and apparatus of the present invention. Partial enlarged view of FIG. FIG. 3A is a schematic explanatory view showing a comparison of magnetically separating magnetically adhering particles from particulate matter in the method of the present invention and the conventional method in FIG. 1 (FIG. 3A shows the method of the present invention, and FIG. 3B shows the conventional method). Law) Schematic explanatory view showing another embodiment of the magnetic force sorting method and device of the present invention. Arrow explanatory view along the line VV in FIG. Schematic explanatory view showing another embodiment of the magnetic force sorting method and device of the present invention. Schematic explanatory view showing another embodiment of the magnetic force sorting method and device of the present invention. Schematic explanatory view showing another embodiment of the magnetic force sorting method and device of the present invention. In Example 1, a graph showing the relationship between the Fe concentration on the magnetized side and the Fe yield according to the method of the present invention and the conventional method. In Example 1, the graph which shows the total separation efficiency of the method of this invention and the conventional method In Example 2, a graph showing the relationship between the Fe concentration on the magnetized side and the Fe yield according to the method of the present invention and the conventional method. In Example 2, the graph which shows the total separation efficiency of the method of this invention and the conventional method

  According to the method of the present invention, when the granular material A containing the magnetically adhering particles x is supplied to the belt conveyor 1, the granular material A is allowed to fall freely, and a magnetic field is applied to the granular material A during the fall by the magnetic field applying means 2. By applying the magnetic field, the fall trajectory of the magnetically adhering particles x is guided to the downstream side in the conveyor conveyance direction or the upstream side in the conveyor conveyance direction. That is, a magnetic force is applied to the magnetically adhering particles x to displace the falling trajectory downstream in the conveyor conveyance direction or upstream in the conveyor conveyance direction. As a result, the particulate matter A is deposited on the belt conveyor 1 in a state where the magnetically adhering particles x are segregated on the upper layer side or the lower layer side, and segregated on the upper side or the lower layer side of the particulate matter A on the belt conveyor 1 as described above. The magnetically adhering particles x are subjected to magnetic force separation by a magnetic force separating means 3 having a magnetic force selecting function according to the segregation form (that is, segregation to the upper layer side or segregation to the lower layer side). According to such a method of the present invention, the magnetically adhering particles x segregated on the upper layer side or the lower layer side are separated by magnetic force, so that the magnetically adhering particles x embrace the non-magnetically adhering particles y, Entrapment of the magnetic particles x by the particles y is suppressed, and the magnetic particles x and the non-magnetic particles y can be accurately separated.

1 and 2 schematically show one embodiment of the magnetic force sorting method and apparatus of the present invention, and FIG. 2 is a partially enlarged view of FIG.
The magnetic separation apparatus of the present invention includes a belt conveyor 1 that conveys a granular material A to be subjected to magnetic separation, a granular material supply unit 4 disposed above the belt conveyor 1, and a supply from the granular material supply unit 4. A magnetic field applying means 2 for applying a magnetic field to the granular material A which is dropped toward the belt conveyor 1 and a magnetic force selecting means 3 for magnetically separating the magnetically adhering particles x from the granular material A deposited on the belt conveyor 1 are provided. However, the magnetic force sorting apparatus of the present embodiment further includes an inclined chute 5 that receives and slides down the granular material A supplied from the granular material supply means 4, and the magnetic field applying means 2 is disposed near the lower end of the inclined chute 5. Have been.

The belt conveyor 1 includes a pulley 12 at a conveyor start end 10, a pulley 13 at a conveyor end 11, and a conveyor belt 14 stretched between the pulleys 12, 13. The granular material A deposited on 14 is conveyed in the horizontal direction.
In the present embodiment, the granular material supply means 4 is constituted by a raw material supply feeder (vibration feeder), and supplies the granular material A and drops the granular material A toward the lower belt conveyor 1.
The inclined chute 5 has a chute surface 50 inclined downward toward the upstream side of the conveyor conveyance direction, and after the granular material A supplied from the granular material supply means 4 is received by the chute surface 50 and slid down, Free-fall from the lower end toward the belt conveyor 1. By dropping the granular material A supplied from the granular material supply means 4 via the inclined chute 5 in this manner, the falling trajectory of the granular material A can be stabilized.

The magnetic field applying means 2 is disposed facing the falling space S1 of the granular material A immediately below the lower end of the inclined chute 5, but in the present embodiment, is disposed downstream of the falling space S1 in the conveyor conveyance direction, A magnetic field is applied to the falling particulate matter A so that the falling trajectory of the main magnetically adherent particles x can be guided downstream in the conveyor transport direction.
The magnetic field applying means 2 according to the present embodiment includes a plate-shaped portion 21 that is provided to be inclined in a direction opposite to the chute surface 50 so as to be continuous with the lower end of the inclined chute 5, and a rear surface of the plate-shaped portion 21. The front surface of the plate portion 21 facing the falling space S1 constitutes a magnetic force acting surface 22.
Here, as shown in FIG. 2, the working surface 22 and the end face of the magnet 20 (magnetic pole) are parallel in order to apply a stable magnetic force to the magnetically adherent particles x from the working surface 22. Is preferred. Further, by the magnetic force of the magnet 20 (suction force) in order to induce stable to the conveyor downstream side falling trajectory of magnetically attached particles x, the line L ₁ and the perpendicular L ₂ perpendicular to the working surface 22 Is preferably about 60 to 90 °.

  The magnetic force sorting means 3 is for magnetically sorting the magnetically adhering particles x segregated on the upper side or the lower side of the granular material A deposited and conveyed on the belt conveyor 1. A magnetic field is applied to the granular material A by the magnetic field applying means 2 disposed downstream of the space S1 in the conveyor transport direction, and the falling trajectory of the magnetically adhering particles x is guided to the downstream side in the conveyor transport direction. The magnetically adhering particles x are segregated on the upper layer side of the particulate matter A deposited on the substrate. For this reason, the magnetic force sorting means 3 is arranged above the belt conveyor 1 and is constituted by means for magnetically adsorbing the magnetically adhering particles x segregated on the upper layer side of the granular material A deposited and conveyed on the belt conveyor 1. Is done.

  The magnetic force sorting means 3 of the present embodiment is constituted by a pulley type magnetic force sorter 3a disposed above the belt conveyor 1. In the pulley type magnetic force sorter 3a, the pulley on the conveyor start end (30) side is constituted by a large-diameter magnet pulley 32, and a conveyor belt 34 is stretched between the magnet pulley 32 and the pulley 33 on the conveyor end section 31 side. Has been established. The pulley-type magnetic separator 3a is arranged such that the conveyor conveyance direction is opposite to that of the belt conveyor 1, and the conveyor start end 30 is located above and near the conveyor end 11 of the belt conveyor 1. ing. In addition, the position of the pulley 33 is selected so that the upper conveyor conveyance part becomes substantially horizontal in the pulley-type magnetic separator 3a.

As the magnet pulley 32, various types of conventionally known structures (for example, magnet pulleys shown in FIG. 2, FIG. 4, and FIG. 5 of WO2014 / 061256) can be applied. Reference numeral 32 is provided with a magnet roll 321 that is driven to rotate independently of the pulley body 320 inside a pulley body 320 that guides the conveyor belt 34. In the magnet roll 321, magnets having different polarities are alternately arranged in the roll circumferential direction.
As the magnet pulley 32, (i) magnetic poles (permanent magnets) of different polarities are alternately arranged in the inner circumferential direction, and the magnetic poles are fixedly installed independently of the rotatable pulley body. Various types of magnets are used, including magnets, (ii) magnetic poles (permanent magnets) with magnetic poles (permanent magnets) arranged at intervals in the inner circumferential direction, and magnetic poles of different polarities alternately arranged in the pulley body length direction. it can.
In the other drawings, reference numeral 6 denotes a magnetically attached material recovery unit that collects the magnetically adhered particles x that have been magnetically separated by the magnetic force selecting unit 3, and reference numeral 7 denotes a non-magnetically attached material recovery unit that collects non-magnetically adhered particles y.

A description will be given of a magnetic force sorting method using the above-described apparatus shown in FIGS.
The granular material A is supplied from the granular material supply means 4 (raw material supply feeder) and is dropped toward the lower belt conveyor 1. In the present embodiment, the supplied granular material A is received by the inclined chute 5 and slides down. After that, the chute 5 is freely dropped from the lower end toward the belt conveyor 1. As described above, the falling trajectory of the granular material A can be stabilized by causing the granular material A to fall freely via the inclined chute 5. The magnetic field applying means 2 (the magnet 20, the working surface 22) disposed on the falling space S <b> 1 of the granular material A just below the lower end of the inclined chute 5 with respect to the granular material A that is falling freely from the lower end of the inclined chute 5 A magnetic field is applied by the plate-shaped portion 21) having the following. Here, if the maximum magnetic field intensity (magnetic field intensity on the working surface 22) applied to the granular material A by the magnetic field applying means 2 is too small, the action of attracting the magnetically adhering particles x in the granular material A by magnetic force is insufficient. On the other hand, if it is too large, the magnetically adhering particles x may be adsorbed on the working surface 22, and the magnetically adhering particles x may aggregate to block the falling space S1. For this reason, the maximum magnetic field strength (magnetic field strength on the working surface 22) is preferably about 300 to 1500 Gauss. When recovering metallic iron from steel slag by the method of the present invention, the maximum magnetic field strength is suitably about 500 gauss.

  Since the magnetic field applying means 2 is disposed downstream of the falling space S1 in the conveyor conveyance direction, the magnetic particles x in the granular material A are attracted by the magnetic force due to the application of the magnetic field, and the main magnetic particles x fall. The track is guided (displaced) downstream in the conveyor conveyance direction. That is, by the application of the magnetic field, the falling trajectory of the main magnetically adherent particles x is on the downstream side in the conveyor conveyance direction, and the falling trajectory of the main non-magnetically adherent particles y is on the upstream side in the conveyor conveyance direction. By dropping the particulate matter A onto the belt conveyor 1 in such a falling trajectory, the particulate matter A is deposited on the belt conveyor 1 in a state where the magnetically adherent particles x are segregated on the upper layer side.

  In the present invention, the magnetically adhering particles x segregated on the upper layer side or the lower layer side of the granular material A deposited and conveyed on the belt conveyor 1 are separated into the segregation forms (segregation on the upper side and segregation on the lower side). In the present embodiment, the magnetically adhering particles x are segregated on the upper layer side of the particulate matter A deposited on the belt conveyor 1 in the present embodiment. Then, the magnetically adhering particles x segregated on the upper layer side of the granular material A are magnetically attracted to a pulley type magnetic separator 3a (magnetic separator 3) disposed above the belt conveyor 1 to perform magnetic separation.

  That is, the magnetically adhering particles x segregated on the upper layer side of the granular material A are adsorbed on the magnet pulley 32 of the pulley type magnetic separator 3a via the conveyor belt 34, and are conveyed while being adsorbed and held by the magnet pulley 32. After being conveyed to the upper part of the machine body by the belt 34 and thereafter conveyed while being placed on the conveyor belt 34, it is discharged from the conveyor end part 31 and collected by the magnetically attached material collection part 6. On the other hand, the non-magnetically adhering particles y (granules mainly composed of the non-magnetically adhering particles y) which have not been magnetically attracted to the pulley type magnetic separator 3a are discharged from the conveyor end portion 11 of the belt conveyor 1, and The magnetic substance is collected by the magnetic substance collection unit 7.

  FIG. 3 shows a state in which the magnetically adherent particles x are magnetically separated from the granular material A on the belt conveyor 1 by the pulley type magnetic separator 3a disposed above the belt conveyor 1 in the method of the present invention and the conventional method. FIG. 3A shows the method of the present invention, and FIG. 3B shows the conventional method. In the conventional method of FIG. 3B, since the magnetic particles x are dispersed in the granular material A, many non-magnetic particles y are embraced by the magnetic particles x on the magnetic side, and In addition, the amount of the magnetic particles x mixed on the non-magnetic side is also large. On the other hand, in the method of the present invention shown in FIG. 3A, the magnetically adhered particles x segregated on the upper layer side are subjected to magnetic force separation by the pulley type magnetic force sorter 3a arranged above the belt conveyor 1. There is little non-magnetic particles y embraced by the magnetic particles x on the magnetic side, and the amount of the magnetic particles x mixed on the non-magnetic side is also small. That is, the magnetically adhering particles x and the non-magnetically adhering particles y can be accurately separated, and the magnetically adhering particles x can be recovered at a high recovery rate.

When the magnetically adhering particles x segregated on the upper layer side of the granular material A are magnetically adsorbed on the magnetic force selecting means 3 arranged above the belt conveyor 1 to perform magnetic force sorting, the magnetic force selecting means 3 is as shown in FIG. Various types other than the pulley-type magnetic separator 3a can be applied.
FIGS. 4 and 5 show an embodiment in which a suspended magnetic separator is used as the magnetic separator 3 disposed above the belt conveyor 1, and FIG. 5 is along the line VV in FIG. It is an arrow view.

In this embodiment, the magnetic force selecting means 3 disposed above the belt conveyor 1 is provided with a belt conveyor 3b (a hanging direction) intersecting the belt conveyor 1 in a plan view (in the present embodiment, orthogonal to the belt conveyor 1). Down magnetic separator). The belt conveyor 3b includes pulleys 35 and 36 at both ends, a conveyor belt 37 stretched between the pulleys 35 and 36, and a magnet plate 38 disposed inside the conveyor belt 37 along the conveyor longitudinal direction. Have. The belt conveyor 3b is arranged such that one end is located immediately above the belt conveyor 1 and the other end is located immediately above the magnetically attached material collecting section 6 installed on the side of the belt conveyor 1, and the magnet plate 38 It is provided in a length range from a position directly above the belt conveyor 1 to a position directly above the magnetically attached material recovery unit 6.
The other configuration is the same as that of the embodiment shown in FIGS. 1 and 2, and thus the same reference numerals are given and the detailed description is omitted.

  In this embodiment, the magnetically adhering particles x segregated on the upper layer side of the granular material A are adsorbed to the magnet plate 38 of the belt conveyor 3b (suspension type magnetic separator) via the conveyor belt 37, and this magnet plate 38 After being conveyed by the conveyor belt 37 while being attracted and held by the magnet plate 38, it is discharged from the belt conveyor 3 b at the end of the magnet plate 38, and is collected by the magnetically attached material collection unit 6. On the other hand, the non-magnetic particles y which are not magnetically adsorbed to the belt conveyor 3b (granules mainly composed of the non-magnetic particles y) are discharged from the conveyor end portion 11 of the belt conveyor 1, and the non-magnetic particles are collected. Collected in the unit 7.

In the present invention, the magnetically adhering particles x may be segregated on the lower layer side of the granular material A that is deposited and transported on the belt conveyor 1, and in this case, the granular material A is transported on the conveyor rather than the falling space S1. A magnetic field is applied to the granular material A by the magnetic field applying means 2 arranged on the upstream side in the direction, and the falling trajectory of the magnetically adhered particles x is guided to the upstream side in the conveyor conveyance direction.
As described above, in the present invention, the magnetically adhering particles x segregated on the upper layer side or the lower layer side of the particulate matter A deposited and conveyed on the belt conveyor 1 are converted into the segregation form (segregation to the upper layer side). (Segregation to the lower layer side) Magnetic separation is performed by the magnetic separation means 3 having a magnetic separation function according to the magnetic separation function. In the case where the magnetically adhering particles x are segregated on the lower side of the granular material A deposited on the belt conveyor 1 As the magnetic force sorting means 3, means for magnetically adsorbing the magnetically adhering particles x segregated to the lower layer side of the granular material A when the granular material A is discharged from the belt conveyor 1 is used.

FIG. 6 shows an embodiment in which the magnetically adhering particles x are segregated on the lower layer side of the granular material A deposited and conveyed on the belt conveyor 1.
The inclined chute 5 has a chute surface 50 inclined downward toward the downstream side in the conveyor conveyance direction. The chute 5 receives the granular material A supplied from the granular material supply means 4 on the chute surface 50 and slides the granular material A down. From the machine to the belt conveyor 1.
The magnetic field applying means 2 is disposed facing the falling space S1 of the granular material A immediately below the lower end of the inclined chute 5, but in the present embodiment, the magnetic field applying means 2 is disposed on the upstream side of the falling space S1 in the conveyor conveyance direction, and A magnetic field is applied to the particulate matter A on the way, so that the fall trajectory of the main magnetically adherent particles x can be guided to the upstream side in the conveyor conveyance direction. Other configurations of the magnetic field applying unit 2 are the same as those of the embodiment of FIG.

  In the present embodiment, a magnetic field is applied to the granular material A by the magnetic field applying means 2 disposed upstream of the falling space S1 in the conveyor conveyance direction, and the falling trajectory of the magnetically adhered particles x is guided to the upstream side of the conveyor conveyance direction. Therefore, the magnetically adhering particles x segregate on the lower layer side of the particulate matter A deposited on the belt conveyor 1. For this reason, the magnetic force sorting means 3 uses a means for magnetically adsorbing the magnetically adhering particles x segregated to the lower layer side of the granular material A when the granular material A is discharged from the belt conveyor 1. The conveyor 1 is constituted by a pulley-type magnetic separator 1a, and the magnetic separator 3 is constituted by a magnet pulley 16 of the pulley-type magnetic separator 1a.

In the pulley-type magnetic separator 1a, the pulley on the conveyor end portion 11 side is constituted by a large-diameter magnet pulley 16, and a conveyor belt 17 is stretched between the magnet pulley 16 and the pulley 15 on the conveyor start end portion 10 side. ing.
As the magnet pulley 16, those having various conventionally known structures (for example, magnet pulleys shown in FIG. 7 and FIG. 8 of WO 2014/061256 and FIG. 1 of JP-A-2014-200723) can be applied. However, the magnet pulley 16 of the present embodiment has a magnet roll 161 that is driven to rotate independently of the pulley body 160 inside a pulley body 160 that guides the conveyor belt 17. In the magnet roll 161, magnets having different polarities are alternately arranged in the roll circumferential direction.
Further, as the magnet pulley 16, (i) magnetic poles (permanent magnets) of different polarities are alternately arranged in the inner circumferential direction, and the magnetic poles are fixedly installed independently of the rotatable pulley body. Various types of magnets are used, including magnets, (ii) magnetic poles (permanent magnets) with magnetic poles (permanent magnets) arranged at intervals in the inner circumferential direction, and magnetic poles of different polarities alternately arranged in the pulley body length direction. it can.
The other configuration is the same as that of the embodiment shown in FIGS. 1 and 2, and thus the same reference numerals are given and the detailed description is omitted.

  In the embodiment shown in FIG. 6, the magnetic field applying means 2 is disposed upstream of the falling space S1 in the conveyor conveyance direction, so that the magnetically adhering particles in the granular material A are attracted by the magnetic force due to the application of the magnetic field, and the main magnetic field is applied. The falling trajectory of the adhesive particles x is guided to the upstream side in the conveyor conveyance direction. That is, by the application of the magnetic field, the fall trajectory of the main magnetically adherent particles x is on the upstream side in the conveyor transport direction, and the fall trajectory of the main non-magnetically adherent particles y is on the downstream side in the conveyor transport direction. By dropping the granular material A onto the belt conveyor 1 in such a falling trajectory, the granular material A is deposited on the belt conveyor 1 in a state where the magnetically adhering particles x are segregated on the lower layer side.

In the present embodiment, since the magnetically adhering particles x are segregated on the lower layer side of the granular material A deposited on the belt conveyor 1, the magnetically adhering particles x segregated on the lower layer side of the granular material A are converted into a pulley type. The magnetic force is magnetically attracted to the magnet pulley 16 (magnetic force selecting means 3) of the belt conveyor 1, which is the magnetic force sorter 1a, and the magnetic force is sorted.
That is, the magnetically adhering particles x segregated to the lower layer side of the granular material A conveyed to the conveyor end portion 11 by the belt conveyor 1 are adsorbed to the magnet pulley 16 via the conveyor belt 17 and held by the magnet pulley 16. Transported to the lower side of the conveyor. On the other hand, the non-magnetic particles y that are not adsorbed by the magnet pulley 16 fall first at the conveyor end portion 11 and are collected by the non-magnetic material collection unit 7. The magnetically adhered particles x conveyed to the lower side of the conveyor fall at a position where the magnetic force of the magnet pulley 16 is weakened, and are collected by the magnetically attached matter collection unit 6.

When the magnetically adhering particles x segregated to the lower layer side of the granular material A are magnetically attracted to the magnetic force sorting means 3 when the granular material A is discharged from the belt conveyor 1, and the magnetic force is sorted, the magnetic force sorting means 3 is shown in FIG. Various types other than the pulley-type magnetic separator 1a as shown in FIG.
FIG. 7 shows an embodiment in which a drum-type magnetic separator 3c arranged adjacent to the conveyor end portion 11 of the belt conveyor 1 is used as the magnetic separator 3.
The drum-type magnetic separator 3 c includes a rotating drum 39 and a fixed magnet 40 disposed inside the rotating drum 39 and independent of the rotating drum 39. The magnet 40 is provided so as to perform magnetic attraction in a range from a position where the particulate matter A is discharged from the belt conveyor 1 to a position at the lower end of the drum in the drum circumferential direction.
The belt conveyor 1 is arranged so that the conveyor end portion 11 is close to the upper part of the rotary drum 39, so that the transported granular material A can be supplied (discharged) to the upper part of the rotary drum 39.
Other configurations are the same as those of the embodiment of FIGS. 1, 2 and 6, and therefore, the same reference numerals are given and the detailed description is omitted.

In the present embodiment, since the magnetically adhering particles x are segregated on the lower layer side of the granular material A deposited on the belt conveyor 1, the magnetically adhering particles x segregated on the lower layer side of the granular material A are converted into a drum type. The magnetic separation is performed by magnetically adsorbing the rotating drum 39 of the magnetic separation machine 3c.
That is, the granular material A conveyed to the conveyor terminal part 11 by the belt conveyor 1 is discharged from the conveyor terminal part 11 to the upper part of the rotating drum 39, and at that time, the magnetically adhering particles x segregated to the lower layer side are: It is adsorbed on the rotating drum 39 and is transported to the lower side of the rotating drum while being held by the rotating drum 39. On the other hand, the non-magnetically adhering particles y that are not adsorbed by the rotating drum 39 fall first and are collected by the non-magnetically attached matter collection unit 7. The magnetically adhered particles x conveyed to the lower side of the rotating drum fall at a position where the magnetic force of the magnet 40 is weakened, and are collected by the magnetically adhered matter collection unit 6.

In the present invention, without providing the inclined chute 5 as shown in FIG. 1, the granular material A supplied from the granular material supply means 4 is allowed to freely fall toward the belt conveyor 1 as it is, and On the other hand, a magnetic field may be applied by the magnetic field applying means 2.
FIG. 8 shows such an embodiment, in which the magnetic field applying means 2 is disposed facing a falling space S2 in which the granular material A supplied from the granular material supplying means 4 falls freely toward the belt conveyor 1 as it is. Have been.

The magnetic field applying means 2 of the present embodiment is disposed downstream of the falling space S2 in the conveyor transport direction, applies a magnetic field to the granular material A in the middle of falling, as in the embodiment of FIG. The falling trajectory of x can be guided to the downstream side in the conveyor conveyance direction.
The magnetic field applying means 2 of the present embodiment is composed of a vertically provided plate-like portion 21 and a magnet 20 (a permanent magnet or the like) arranged on the back side of the plate-like portion 21. The front surface facing the space S2 constitutes the magnetic force acting surface 22. It is preferable that the working surface 22 and the end face of the magnet 20 (magnetic pole) are parallel to each other so that a stable magnetic force can be applied from the working surface 22 to the magnetically adhering particles x.
The other configuration is the same as that of the embodiment shown in FIGS. 1 and 2, and thus the same reference numerals are given and the detailed description is omitted.

In this embodiment, the granular material A is supplied from the granular material supply means 4 (raw material supply feeder), and is freely dropped toward the lower belt conveyor 1. A magnetic field is applied by the magnetic field applying means 2 (the magnet 20, the plate-shaped portion 21 having the working surface 22) facing the surface. The maximum magnetic field strength in this case (the magnetic field strength at the operation surface 22) is also the same as in the embodiment of FIG. Since the magnetic field applying means 2 is disposed downstream of the falling space S2 in the conveyor conveyance direction, the magnetically-attached particles x in the granular material A are attracted by the magnetic force due to the application of the magnetic field, and the main magnetically-attached particles x fall. The track is guided downstream in the conveyor transport direction. The other points are the same as described in the embodiment of FIG.
In each of the embodiments described above, in the belt conveyor 1 (including the pulley-type magnetic separator 1a), the belt conveyor 3a, and the pulley-type magnetic separator 3a, any one of these pulleys is a driving pulley.

  The magnetic separation method of the present invention described above is a method useful for, for example, separating and recovering iron from steel slag generated in a steel manufacturing process, and for separating high-grade ore from iron ore in a mine. By magnetically separating the magnetically adhering particles x from the iron slag or iron ore, which is the granular material A, the magnetically adhering particles x can be collected as a raw material for iron production.

[Example 1]
For a 20 kg sample of steel slag (Fe concentration: about 51% by mass) crushed to a particle size of 5 mm or less, the magnetic force of Fe (metallic iron) was separated by the following method.
(1) Method of the present invention: magnetic force sorting according to the embodiment shown in FIG. 1-magnetic field strength on the working surface of the magnetic field applying means 2: 500 gauss-layer thickness of the raw material layer on the belt conveyor 1: 10 mm
・ Conveyance speed of belt conveyor 1: 15m / min
-Distance between the raw material layer on the belt conveyor 1 and the pulley-type magnetic separator 3a: 0 mm
-Magnetic field strength on the working surface of the pulley type magnetic separator 3a: 600 gauss

(2) Conventional method 1: Magnetic force sorting according to the embodiment of FIG. 6 except that the magnetic field applying means 2 is not used.-Layer thickness of the raw material layer on the belt conveyor 1: 10 mm
・ Conveyance speed of belt conveyor 1: 15m / min
-Distance between the raw material layer on the belt conveyor 1 and the pulley-type magnetic separator 1a: 0 mm
-Magnetic field strength on the working surface of the pulley type magnetic separator 1a: 600 gauss (3) Conventional method 2: Magnetic separator according to the embodiment of Fig. 4 except that the magnetic field applying means 2 is not used-On the belt conveyor 1 Material layer thickness: 10 mm
・ Conveyance speed of belt conveyor 1: 15m / min
・ Distance between the raw material layer on the belt conveyor 1 and the suspended magnetic separator: 5 mm
-Magnetic field strength on the working surface of the hanging type magnetic separator 3a: 600 gauss

FIG. 9 shows the results obtained by examining the magnetic concentration side Fe concentration and Fe yield of the product obtained in this test. According to this, in the conventional method 1, since Fe embraces the slag, the concentration of Fe on the magnetized side cannot be sufficiently increased. On the other hand, in the conventional method 2, although the Fe concentration on the magnetically attached side is higher than in the conventional method 1, the slag embraces the conversely, and the Fe loss (Fe recovery rate) decreases due to the increase in Fe loss. In other words, in the conventional methods 1 and 2, there is a trade-off relationship between the magnetically deposited Fe concentration and the Fe yield.
On the other hand, in the method of the present invention, the result is that both the Fe concentration on the magnetized side and the Fe yield are compatible, and it can be seen that the performance of separating Fe and slag is higher than that of the conventional method.
FIG. 10 shows the total separation efficiency of the method of the present invention and the conventional methods 1 and 2 (total separation efficiency = [Fe amount of magnetized side / total Fe amount of raw material] + [slag amount of non-magnetically bonded side / raw material of raw material] Total slag amount] -1), which shows that the performance of the method of the present invention is high.

[Example 2]
For a 20 kg sample of iron and steel slag (Fe concentration: about 20% by mass) crushed to a particle size of 1 mm or less, magnetic separation of Fe (metallic iron) was performed by the following method.
(1) Method of the present invention: magnetic force sorting according to the embodiment shown in FIG.
-Magnetic field strength on the working surface of the magnetic field applying means 2: 800 Gauss-Layer thickness of the raw material layer on the belt conveyor 1: 10 mm
・ Conveyance speed of belt conveyor 1: 15m / min
-Distance between the raw material layer on the belt conveyor 1 and the pulley-type magnetic separator 3a: 0 mm
-Magnetic field strength on the working surface of the pulley type magnetic separator 3a: 1500 Gauss

(2) Conventional method 1: Magnetic force sorting according to the embodiment of FIG. 6 except that the magnetic field applying means 2 is not used.-Layer thickness of the raw material layer on the belt conveyor 1: 10 mm
・ Conveyance speed of belt conveyor 1: 15m / min
-Distance between the raw material layer on the belt conveyor 1 and the pulley-type magnetic separator 1a: 0 mm
-Magnetic field strength at the working surface of the pulley type magnetic force separator 1a: 1500 Gauss (3) Conventional method 2: Magnetic force separation according to the embodiment of Fig. 4 except that the magnetic field applying means 2 is not used-On the belt conveyor 1 Material layer thickness: 10 mm
・ Conveyance speed of belt conveyor 1: 15m / min
・ Distance between the raw material layer on the belt conveyor 1 and the suspended magnetic separator: 5 mm
-Magnetic field strength on the working surface of the hanging type magnetic separator 3a: 1500 Gauss

  FIG. 11 shows the results obtained by examining the magnetic concentration side Fe concentration and Fe yield of the product obtained in this test. FIG. 12 shows the total separation efficiency of the method of the present invention and the conventional methods 1 and 2 (total separation efficiency = [Fe amount of magnetized side / total Fe amount of raw material] + [slag amount of non-magnetically bonded side / raw material of raw material] Total slag amount] -1). Similarly to the result of Example 1, it can be seen that the performance of the present invention is higher than those of Conventional Methods 1 and 2.

REFERENCE SIGNS LIST 1 belt conveyor 1a pulley-type magnetic separator 2 magnetic-field applying means 3 magnetic-force separator 3a pulley-type magnetic separator 3b belt conveyor 3c drum-type magnetic separator 4 granular material supply means 5 inclined chute 6 magnetized material collection unit 7 nonmagnetic material collection Part 10 Conveyor start end 11 Conveyor end 12 Pulley 13 Pulley 14 Conveyor belt 15 Pulley 16 Magnet pulley 17 Conveyor belt 20 Magnet 21 Plate part 22 Working surface 30 Conveyor start end 31 Conveyor end 32 Magnet pulley 33 Pulley 34 Conveyor belt 35 Pulley 36 Pulley 37 Conveyor belt 38 Magnet plate 39 Rotating drum 40 Magnet 50 Chute surface 160 Pulley body 161 Magnet roll 320 Pulley body 321 Magnet roll S1 Falling space S2 Falling space x Magnetically adhered particles y Non-magnetically adhered particles A granular material

Claims (19)

A method of magnetically separating magnetically adherent particles (x) from a granular material (A) containing magnetically adherent particles (x),
The particulate matter (A) is dropped from above toward the belt conveyor (1), and is dropped by the magnetic field applying means (2) arranged downstream of the falling space in the conveyor conveyance direction or upstream of the conveyor conveyance direction. A magnetic field is applied to the granular material (A) of the above, and by applying the magnetic field, the falling trajectory of the main magnetically adherent particles (x) is guided to the downstream side in the conveyor transport direction or the upstream side in the conveyor transport direction, and the granular material (A) is By dropping on the belt conveyor (1) (however, all the granular materials (A) to which the magnetic field is applied by the magnetic field applying means (2) are dropped on the belt conveyor (1)). A particulate matter (A) is deposited on the upper layer side or the lower layer side in a state where the magnetically adhering particles (x) are segregated,
The magnetic particles (x) segregated on the upper layer side or the lower layer side of the granular material (A) deposited and conveyed on the belt conveyor (1) are magnetically separated by a magnetic force separating means (3). Magnetic separation method for granular materials. Above the belt conveyor (1), a granular material supply means (4) for supplying the granular material (A) and dropping it freely toward the belt conveyor (1 ) is arranged, and a space for dropping the granular material (A). Magnetic field applying means (2) is arranged facing
The granular material (A) supplied from the granular material supply means (4) is dropped freely toward the belt conveyor (1), and a magnetic field is applied to the granular material (A) during the fall by the magnetic field applying means (2). The method of claim 1, wherein magnetic force is applied. Above the belt conveyor (1), a granular material supply means (4) for supplying the granular material (A), and an inclined chute for receiving and sliding down the granular material (A) supplied from the granular material supply means (4). (5) is arranged, and a magnetic field applying means (2) is arranged facing the falling space of the particulate matter (A) immediately below the lower end of the inclined chute (5);
After the granular material (A) supplied from the granular material supply means (4) is received by the inclined chute (5) and slid down, it is dropped freely from the lower end of the inclined chute (5) toward the belt conveyor (1), 2. The method according to claim 1, wherein a magnetic field is applied to the falling particles (A) by a magnetic field applying means (2).   The magnetically segregating particles (x) segregated on the upper layer side of the particulate matter (A) deposited and conveyed on the belt conveyor (1) are separated by a magnetic force sorting means (3) disposed above the belt conveyor (1). 4. The magnetic force sorting method for granular material according to claim 1, wherein magnetic separation is performed by magnetically attracting the magnetic particles.   The magnetic force sorting means (3) comprises a pulley type magnetic force sorter (3a) in which the pulley on the side of the conveyor start end (30) is constituted by a magnet pulley (32) and the conveyor conveyance direction is opposite to that of the belt conveyor (1). 5. The granular material according to claim 4, wherein a conveyor start end (30) of the pulley type magnetic separator (3 a) is located above the conveyor end (11) of the belt conveyor (1). 6. Magnetic sorting method for objects.   The magnetic force selecting means (3) comprises a magnet plate (38) inside the conveyor belt (37) and comprises a belt conveyor (3b) arranged in a direction crossing the belt conveyor (1). Item 5. A method for magnetically sorting granular materials according to Item 4.   The magnetically adhering particles (x) segregated on the lower layer side of the granular material (A) deposited and conveyed on the belt conveyor (1) are removed by magnetic force when the granular material (A) is discharged from the belt conveyor (1). 4. The magnetic force sorting method according to claim 1, wherein magnetic sorting is performed by magnetically adsorbing the sorting means (3).   The belt conveyor (1) is composed of a pulley type magnetic separator (1a) in which the pulley on the side of the conveyor end (11) is composed of a magnet pulley (16), and the magnetic separator (3) is composed of a magnet pulley (16). The method for magnetically sorting granular materials according to claim 7, wherein:   The granular material according to claim 7, characterized in that the magnetic sorting means (3) comprises a drum-type magnetic sorting machine (3c) arranged adjacent to the conveyor end (11) of the belt conveyor (1). Magnetic force sorting method. An apparatus for magnetically separating magnetically adhering particles (x) from particulate matter (A) containing magnetically adhering particles (x),
A belt conveyor (1),
A granular material supply means (4) disposed above the belt conveyor (1), for supplying the granular material (A) and dropping the granular material (A) toward the belt conveyor (1);
The main magnetically adhering particles (x) are arranged by applying a magnetic field to the granular material (A) which is disposed on the downstream side in the conveyor transport direction or the upstream side in the conveyor transport direction from the space where the granular material (A) falls. Magnetic field applying means (2) for guiding the falling trajectory to the downstream side of the conveyor conveyance direction or the upstream side of the conveyor conveyance direction (however, all of the granular materials (A) to which a magnetic field is applied without performing magnetic force sorting of the granular materials (A)) Means for applying a magnetic field to the belt conveyor (1)),
A magnetic separation means (3) for magnetically separating magnetically adhering particles (x) segregated on the upper layer side or the lower layer side of the granular material (A) deposited and conveyed on the belt conveyor (1); Magnetic separation device for granular materials. The magnetic field applying means (2) is arranged facing the falling space of the granular material (A) supplied from the granular material supply means (4) and freely falling toward the belt conveyor (1). Item 11. A magnetic force sorting apparatus for granular materials according to Item 10.   An inclined chute (5) for receiving and sliding down the granular material (A) supplied from the granular material supply means (4) faces the falling space of the granular material (A) immediately below the lower end of the inclined chute (5). 11. The apparatus according to claim 10, wherein the magnetic field applying means is disposed.   A magnetic separation unit (3) is disposed above the belt conveyor (1), and the magnetically adhering particles (x) segregated on the upper layer side of the granular material (A) deposited and conveyed on the belt conveyor (1). 13. A magnetic force sorting apparatus for granular materials according to claim 10, wherein said magnetically segregating means is a means for magnetically attracting particles.   The magnetic force sorting means (3) comprises a pulley type magnetic force sorter (3a) in which the pulley on the side of the conveyor start end (30) is constituted by a magnet pulley (32) and the conveyor conveyance direction is opposite to that of the belt conveyor (1). 14. Granular according to claim 13, characterized in that the conveyor start end (30) of the pulley type magnetic separator (3a) is located above the conveyor end (11) of the belt conveyor (1). Magnetic sorting device for objects.   The magnetic force selecting means (3) comprises a magnet plate (38) inside the conveyor belt (37) and comprises a belt conveyor (3b) arranged in a direction crossing the belt conveyor (1). Item 14. A magnetic force sorting apparatus for granular materials according to Item 13.   The magnetic force separating means (3) converts the magnetically adhering particles (x) segregated to the lower layer side of the granular material (A) deposited and conveyed on the belt conveyor (1), and converts the granular material (A) into the belt conveyor ( 13. A magnetic force sorting apparatus for granular materials according to claim 10, wherein said means is a magnetically attracting means when dispensing from 1).   The belt conveyor (1) is composed of a pulley type magnetic separator (1a) in which the pulley on the side of the conveyor end (11) is composed of a magnet pulley (16), and the magnetic separator (3) is composed of a magnet pulley (16). The magnetic separation apparatus for granular materials according to claim 16, wherein the magnetic separation apparatus comprises:   17. Granulated material according to claim 16, wherein the magnetic sorting means (3) comprises a drum type magnetic sorting machine (3c) arranged adjacent to the conveyor end (11) of the belt conveyor (1). Magnetic separator.   The magnetic separation method according to any one of claims 1 to 9, magnetically separates the magnetically adhering particles (x) from the steel slag or the iron ore, which is the granular material (A), and removes the magnetically adhering particles (x). A method for producing a steelmaking raw material, comprising recovering the raw material as a steelmaking raw material.

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