JP5842853B2 - Method and apparatus for separating ferromagnetic material - Google Patents

Description

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

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

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

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

  FIG. 7 is a pulley type magnetic separator, and one pulley holding the conveyor belt 60 constitutes a magnet pulley 61. In the circumferential direction inside the magnet pulley 61, magnetic poles (permanent magnets) having different polarities are alternately arranged. This magnetic pole is a fixed magnet that is fixedly installed independently from the rotatable pulley body. In this magnetic separator, a granular material a containing ferromagnetic particles is supplied onto a conveyor belt 60 from a supply device (not shown), and when the granular material a is discharged from the end of the conveyor, a magnet pulley is used. The magnetic force of 61 is applied to separate the ferromagnetic particles from the non-magnetic particles.

Here, as shown in FIG. 7, when particles of various particle sizes are mixed in the granular material a (black particles: ferromagnetic particles, white particles: non-magnetic particles), the large-diameter strong Magnetic particles are collected as magnetic deposits while embracing small and medium-sized non-magnetic particles. Since the magnetic force is proportional to the volume of the magnetic material, the larger ferromagnetic particles are attracted more strongly, so the large ferromagnetic particles can easily embrace the small and medium non-magnetic particles as described above. It will end up. Further, the attraction of the small and medium diameter ferromagnetic particles is inhibited by the large diameter nonmagnetic particles. That is, when the distance between the small and medium-sized ferromagnetic particles and the magnet is increased, the magnetic force becomes weak, and when the large-sized non-magnetic particles fall to the non-magnetization collecting part side, the small and medium-diameter particles are simultaneously removed. The ferromagnetic particles also fall to the non-magnetic adhesion recovery part side.
Because of such a phenomenon, in a process that requires high-purity and high-efficiency separation, for example, as shown in Patent Documents 1 to 3, the granular material to be treated is classified with a multistage sieve. A method of processing by particle size with a plurality of magnetic separators or temporarily storing by particle size and switching the processing particle size with one magnetic separator is used.

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

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

  The present inventors deposited powder particles on the conveyor belt in such a state that the particle size is gradually segregated from one side to the other side in the width direction of the conveyor belt, and this particle size segregated powder. By supplying the particles to the magnetic separator, or with respect to the rotating drum of the rotating drum type magnetic separator, the particles are sequentially moved from one side of the rotating drum width direction to the other side. By supplying the particles in a segregated state that becomes coarser, the phenomenon of embedding small / medium non-magnetic particles by large-diameter ferromagnetic particles as shown in FIG. It has been found that the phenomenon in which the attraction of magnetic particles is inhibited by the non-magnetic particles having a large diameter can be effectively prevented.

The present invention has been made on the basis of such findings and has the following gist.
[1] A separation method for separating ferromagnetic particles from a powder (a) containing ferromagnetic particles by magnetic sorting,
On the conveyor belt (1), the granular material (a) is deposited in a state of particle size segregation so that the particle size gradually becomes coarser from one side to the other side in the width direction of the conveyor belt. A method for separating a ferromagnetic material, wherein a) is conveyed by a conveyor belt (1) and supplied to a magnetic force sorting section (2).

[2] In the separation method of [1] above, the sieve is configured such that the opening of the sieve is gradually increased from one side to the other side in the width direction of the conveyor belt above the conveyor belt (1). Place the device (3),
By supplying the granular material (a) to the sieving device (3) from the end of the side having the smallest sieve opening, the granular material (a) having passed through the sieving device is transferred to the conveyor belt (1). A method of separating a ferromagnetic material, wherein the particles are deposited in a state of particle segregation such that the particle size gradually increases from one side to the other side in the conveyor belt width direction.
[3] The method for separating a ferromagnetic material according to the above [1] or [2], wherein the sieving device (3) comprises an inclined sieve or a rotary inclined sieve.

[4] In the separation method according to any one of [1] to [3], the conveyor belt (1) and the magnetic separator (2) are each composed of a conveyor belt and a magnetic pulley of a pulley type magnetic separator. A method for separating a ferromagnetic material.
[5] In the separation method according to any one of [1] to [3], the magnetic separator (2) is a suspension magnetic separator or a rotary drum magnetic separator. Separation method.
[6] A separation method for separating ferromagnetic particles from a powder (a) containing ferromagnetic particles by magnetic sorting,
With respect to the rotating drum (5) of the rotating drum type magnetic separator (2x), the particle size (a) is such that the particle size gradually increases from one side to the other side in the rotating drum width direction. A method for separating a ferromagnetic material, wherein the ferromagnetic material is supplied in a segregated state.

[7] In the separation method of [6] above, the sieve is configured such that the mesh opening of the sieve is gradually increased from one side to the other side in the width direction of the rotary drum above the rotary drum (5). Place the device (3),
The granular material (a) that has passed through the sieve is supplied to the rotating drum (5) by supplying the granular material (a) to the sieving device (3) from the end of the side having the smallest sieve opening. ) In the state where the particle size is segregated so that the particle size is gradually increased from one side to the other side in the width direction of the rotating drum.
[8] The method for separating a ferromagnetic material according to the above [6] or [7], wherein the sieving device (3) is an inclined sieve or a rotary inclined sieve.

[9] A separation device for separating ferromagnetic particles from a powder (a) containing ferromagnetic particles by magnetic separation,
Conveyor belt (1) for conveying the powder (a), sieve device (3) disposed above the conveyor belt (1), and powder (a) conveyed by the conveyor belt (1) Including a magnetic force sorting section (2) to which
The sieving device (3) is configured such that the sieve mesh size increases sequentially from one side of the conveyor belt width direction to the other side, and the sieving device has a powder at the end of the side with the smallest sieve mesh size. A separator for a ferromagnetic material, comprising a supply unit (30) for the granular material (a).

[10] The separation apparatus for a ferromagnetic material according to [9], wherein the sieve device (3) is an inclined sieve or a rotary inclined sieve.
[11] In the separation device according to [9] or [10], the conveyor belt (1) and the magnetic separator (2) are each composed of a conveyor belt and a magnetic pulley of a pulley type magnetic separator. Magnetic material separation device.
[12] The separator according to [9] or [10], wherein the magnetic separator (2) is a hanging magnetic separator or a rotary drum magnetic separator.

[13] A separation device for separating ferromagnetic particles from a powder (a) containing ferromagnetic particles by magnetic separation,
A rotary drum type magnetic separator (2x), and a sieve device (3) disposed above the rotary drum (5) of the rotary drum type magnetic separator (2x),
The sieving device (3) is configured such that the opening of the sieving is gradually increased from one side to the other side in the width direction of the rotating drum, and at the end of the side having the smallest opening of the sieving A separator for a ferromagnetic material, comprising a supply unit (30) for the granular material (a).
[14] The separator according to [13], wherein the sieving device (3) is an inclined sieve or a rotary inclined sieve.

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

It is explanatory drawing which shows one Embodiment of the 1st isolation | separation method of this invention, FIG. 1 (A) is a perspective view, FIG.1 (B) is sectional drawing which follows the bb line | wire of FIG. 1 (A). An explanatory view showing an example of a more specific embodiment of the first separation method and apparatus of the present invention. Explanatory drawing which shows the other example of more concrete embodiment about the 1st isolation | separation method and apparatus of this invention. Explanatory drawing which shows the other example of more concrete embodiment about the 1st isolation | separation method and apparatus of this invention. Explanatory drawing which shows the other example of more concrete embodiment about the 1st isolation | separation method and apparatus of this invention. An explanatory view showing an example of a specific embodiment of the second separation method and apparatus of the present invention. Explanatory drawing showing a conventional separation method

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

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

  In the first separation method of the present invention, a state in which the particle size is segregated on the conveyor belt 1 so that the particle size is gradually increased from one side to the other side in the width direction of the conveyor belt (hereinafter simply referred to as “particle size segregation”). In some cases, the state is sometimes referred to as “state”), the granular material a is deposited, and the granular material a is conveyed by the conveyor belt 1 and supplied to the magnetic force sorting unit 2. As a method of depositing the granular material a in a state of being segregated on the conveyor belt 1, it is most convenient to use a sieve device having a special configuration as shown in an embodiment described later, but is not limited thereto. For example, the granular material a is classified in advance into a plurality of particle size levels, and the particle size segregated by loading the granular material a for each particle size at each position in the conveyor belt width direction. May be realized.

  The granular material a deposited on the conveyor belt 1 is conveyed by the conveyor belt 1 and supplied to the magnetic sorting unit 2, and the ferromagnetic particles are attracted by the magnetic force of the magnetic sorting unit 2, so that the non-magnetic particles are extracted. To be separated. In this embodiment, when the granular material a is paid out from the conveyor terminal part 10, the magnetic force of the magnet pulley 4 which comprises the magnetic force selection part 2 acts. Here, since the granular material a supplied to the magnetic force sorting unit 2 is in a state of particle size segregation such that the particle size is gradually increased from one side to the other side in the conveyor belt width direction, the magnetic force sorting unit The magnetic separation action by 2 is substantially the same as processing (magnetic force sorting) by dividing the granular material a by particle size. Therefore, the phenomenon that the large-diameter ferromagnetic particles as shown in FIG. 7 embrace the small / medium-diameter non-magnetic particles, or the small-medium-diameter ferromagnetic particles are attracted by the large-diameter non-magnetic particles. The phenomenon of inhibition by body particles can be suppressed, and these phenomena cause small and medium diameter non-magnetic particles to be recovered as magnetic deposits, and small and medium diameter ferromagnetic particles are not magnetized. Can be prevented from being collected. In addition, although FIG. 1 (B) shows the situation in which magnetic particles are properly sorted as described above for finely divided granular material a that has been segregated in particle size, the granular material a having a coarser particle size is also shown. Similarly, the magnetic force is properly selected.

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

Here, as the state where the particle size segregated so that the particle size of the granular material a gradually becomes larger from one side in the conveyor belt width direction to the other side, the particle size is continuously changed in the conveyor belt width direction. The state may be changed in a stepwise manner or in a state where both are mixed. Moreover, in any state, inevitable variation in particle size (for example, a case where a small amount of particles having an inevitable fine particle size is included in a region having a large particle size) is allowed.
In addition to the pulley-type magnetic separator (magnet pulley), a rotating drum magnetic separator, a suspended magnetic separator, and the like can be applied as the magnetic separator 2.

  FIG. 2 shows an example of a more specific embodiment of the first separation method and apparatus of the present invention. In this embodiment, a sieve opening (screen) is provided above the conveyor belt 1. Is arranged such that the size of the sieving device 3 is gradually increased from one side to the other side in the width direction of the conveyor belt. By supplying the granular material a from the particle size of the granular material a that has passed through the sieve, the particle size gradually increases on the conveyor belt 1 from one side in the width direction of the conveyor belt toward the other side. It is deposited in a segregated state.

  The separation device includes a conveyor belt 1 that conveys the granular material a, a sieving device 3 that is disposed above the conveyor belt 1, and a magnetic separator that is supplied with the granular material a that is conveyed by the conveyor belt 1. 2 is provided. The sieve device 3 is configured such that the sieve openings (screens) increase sequentially from one side to the other side in the conveyor belt width direction, and the side with the smallest sieve openings. The supply part 30 of the granular material a is provided in the edge part.

The sieving device 3 of the present embodiment is configured by a vibration type inclined sieve (inclined vibrating sieve). The inclined sieve is disposed at the upper position of the conveyor belt 1 along the conveyor width direction, is inclined downward toward one side of the conveyor belt width direction, and the upper end side is the supply unit 30. In the sieving device 3, the sieve openings (screens) are sequentially reduced in three stages in the width direction of the conveyor belt, but may be gradually reduced in more stages or continuously.
In addition, the sieving device 3 is in a state in which the granular material a that has passed through the sieving is segregated on the conveyor belt 1 such that the particle size gradually increases from one side to the other side in the conveyor belt width direction. Since they may be deposited, it is not necessarily provided so as to be orthogonal to the longitudinal direction of the conveyor belt. The same applies to a rotating and tilting screen of an embodiment described later.

In this embodiment, when the granular material a is supplied to the sieving device 3 from the supply unit 30 (the end on the side where the sieve mesh is the smallest), the coarser granular material a is in the conveyor belt width direction. Is placed on the conveyor belt 1 closer to one side of the particle body a, so that the granular material a is in a state of particle size segregation such that the particle size gradually increases from one side to the other side in the conveyor belt width direction. accumulate.
The granular material a deposited on the conveyor belt 1 is transported by the conveyor belt 1 and supplied to the magnetic sorting unit 2, and the ferromagnetic material is generated by the magnetic force of the magnetic sorting unit 2 according to the principle described in the embodiment of FIG. The particles are separated from the non-magnetic particles by being attracted.

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

Also in this embodiment, when the granular material a is supplied to the sieving device 3 from the supply unit 30 (the end on the side with the smallest sieve opening), the coarser granular material a is in the conveyor belt width direction. Is placed on the conveyor belt 1 closer to one side of the particle body a, so that the granular material a is in a state of particle size segregation such that the particle size gradually increases from one side to the other side in the conveyor belt width direction. accumulate.
The granular material a deposited on the conveyor belt 1 is transported by the conveyor belt 1 and supplied to the magnetic sorting unit 2, and the ferromagnetic material is generated by the magnetic force of the magnetic sorting unit 2 according to the principle described in the embodiment of FIG. The particles are separated from the non-magnetic particles by being attracted.

FIG. 4 shows another example of a more specific embodiment of the first separation method and apparatus of the present invention. In this embodiment, the magnetic separator 2 is constituted by a suspended magnetic separator. It is a thing. The suspended magnetic sorter includes a conveyor belt 6 disposed along the width direction of the conveyor belt 1 and a magnet 7 disposed inside the conveyor belt 6, and is suspended and held above the conveyor belt 1. Is done. This suspended magnetic sorter causes the magnetic force of the magnet 7 to act on the granular material a on the conveyor belt 1 via the conveyor belt 6 and attracts ferromagnetic particles to the lower surface of the conveyor belt 6. The magnetic particles are separated from the non-magnetic particles and conveyed to the magnetized material collection unit while being adsorbed on the conveyor belt 6.
Since other configurations are the same as those of the embodiment of FIG. 2, the same reference numerals are given, and detailed descriptions thereof are omitted.

Also in this embodiment, when the granular material a is supplied to the sieving device 3 from the supply unit 30 (the end on the side with the smallest sieve opening), the coarser granular material a is in the conveyor belt width direction. Is placed on the conveyor belt 1 closer to one side of the particle body a, so that the granular material a is in a state of particle size segregation such that the particle size gradually increases from one side to the other side in the conveyor belt width direction. accumulate.
The granular material a deposited on the conveyor belt 1 is conveyed by the conveyor belt 1 and supplied to the magnetic sorting unit 2 (suspended magnetic sorter), and is based on the same principle as described in the embodiment of FIG. The ferromagnetic particles are attracted by the magnetic force of the magnetic force selector 2 and separated from the non-magnetic particles. The suspension type magnetic sorting machine constituting the magnetic sorting unit 2 is configured to adsorb the ferromagnetic particles on the lower surface of the conveyor belt 6 as described above to separate them from the non-magnetic particles and leave them adsorbed on the conveyor belt 6. Transport to the magnetic deposit collection part.

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

Also in this embodiment, when the granular material a is supplied to the sieving device 3 from the supply unit 30 (the end on the side with the smallest sieve opening), the coarser granular material a is in the conveyor belt width direction. Is placed on the conveyor belt 1 closer to one side of the particle body a, so that the granular material a is in a state of particle size segregation such that the particle size gradually increases from one side to the other side in the conveyor belt width direction. accumulate.
The granular material a deposited on the conveyor belt 1 is transported by the conveyor belt 1 and supplied to the magnetic sorting unit 2 (rotating drum 5), and the magnetic sorting is performed according to the same principle as described in the embodiment of FIG. The ferromagnetic particles are attracted by the magnetic force of the portion 2 to be separated from the non-magnetic particles. Although the granular material a delivered from the conveyor terminal 10 is sent along the arc of the magnetic separator 2 (rotating drum 5), since the non-magnetic particles are not attracted to the magnetic separator 2, the magnetic separator immediately. It moves away from the part 2 and falls in front of the magnetic force sorting part 2. On the other hand, after the ferromagnetic particles are attracted to the magnetic force sorting unit 2 and sent, the magnetic particles fall below the magnetic force sorting unit 2 due to gravity when the influence of the magnetic field disappears.

FIG. 6 shows an example of a specific embodiment of the second separation method and apparatus of the present invention. In this second separation method, instead of passing through the conveyor belt 1 as in the first separation method, the granular material a and the particle size of the rotating drum are set to the rotating drum 5 of the rotating drum type magnetic separator 2x. It is supplied directly in a state of grain segregation that gradually becomes coarse from one side to the other side in the width direction (hereinafter, sometimes simply referred to as “granular grain segregation”).
The configurations of the rotary drum type magnetic separator 2x and the rotary drum 5 are the same as those in the embodiment of FIG. In FIG. 6, a is a powder (black particles: ferromagnetic particles, white particles: non-magnetic particles).
Here, as a method of supplying the granular material a to a state where the granular material is segregated with respect to the rotating drum, it is most convenient to use a sieve device having a special configuration as shown in the present embodiment, but the method is limited to this. Not. For example, the above-mentioned supply form is realized by classifying the granular material a into a plurality of particle size levels in advance and inserting the granular material a for each particle size in each position in the rotational drum width direction. May be.

  The magnetic force of the magnet inside the drum acts on the granular material a supplied on the rotating drum 5. Here, since the granular material a supplied on the rotating drum 5 is in a state of particle size segregation such that the particle size gradually increases from one side to the other side in the width direction of the rotating drum, The magnetic separation action by 2 is substantially the same as processing (magnetic force sorting) by dividing the granular material a by particle size. Therefore, the phenomenon that the large-diameter ferromagnetic particles as shown in FIG. 7 embrace the small / medium-diameter non-magnetic particles, or the small-medium-diameter ferromagnetic particles are attracted by the large-diameter non-magnetic particles. The phenomenon of inhibition by body particles can be suppressed, and these phenomena cause small and medium diameter non-magnetic particles to be recovered as magnetic deposits, and small and medium diameter ferromagnetic particles are not magnetized. Can be prevented from being collected.

As described above, the ferromagnetic particles and the non-magnetic particles can be separated with high accuracy in the rotary drum 5. That is, the granular material a is sent along the arc of the rotating drum 5, but the non-magnetic particles are not attracted to the rotating drum 5 (magnet), so that they immediately leave the rotating drum 5 and fall to the front of the rotating drum 5. To do. On the other hand, the ferromagnetic particles move while being attracted to the rotating drum 5 and fall below the rotating drum 5 due to gravity when the influence of the magnetic field is eliminated.
Here, as the state of particle size segregation in which the particle size of the granular material a gradually increases from one side of the rotating drum width direction toward the other side, the particle size continuously changes in the rotating drum width direction. The state may be changed in a stepwise manner or in a state where both are mixed. Moreover, in any state, inevitable variation in particle size (for example, a case where a small amount of particles having an inevitable fine particle size is included in a region having a large particle size) is allowed.

Further, in the embodiment of FIG. 6, a sieve device configured such that the mesh openings (sieving meshes) are gradually increased from one side to the other side in the conveyor belt width direction above the rotating drum 5. 3 and supplying the granular material a to the sieving device 3 from the end of the side having the smallest sieve opening, the granular material a that has passed through the sieve has a particle size of the rotating drum width. It is supplied to the rotary drum 5 in a state where the particle size is segregated so as to gradually become rough from one side of the direction to the other side.
The separation device includes a rotary drum type magnetic separator 2x and a sieve device 3 disposed above the rotary drum 5 of the rotary drum type magnetic separator 2x. The sieve device 3 is configured such that the sieve opening (screen) gradually increases from one side to the other side in the rotational drum width direction, and the sieve opening on the side where the sieve opening is the smallest. It has the supply part 30 of the granular material a in an edge part.
The sieving device 3 of the present embodiment is composed of a vibration-type inclined sieve (inclined vibrating sieve), and the configuration thereof is the same as that of the embodiment of FIG. Omitted. Note that the sieving device 3 may be constituted by a rotating inclined sieve or the like.

  In this embodiment, when the granular material a is supplied to the sieving device 3 from the supply unit 30 (the end on the side with the smallest sieve opening), the coarser granular material a is in the width direction of the rotating drum. In this state, the granular material a is in a state of particle size segregation such that the particle size gradually increases from one side to the other side in the width direction of the rotating drum. It is supplied (charged) onto the rotating drum 5. The supplied granular material a is separated from non-magnetic particles by attracting the ferromagnetic particles by the magnetic force of the rotating drum 5 on the same principle as described in the embodiment of FIG.

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

Moreover, in each embodiment mentioned above, although the granular material a which passed the sieving apparatus 3 is directly dropped (charged) on the conveyor belt 1 or the rotating drum 5 as it is, the powder which has passed the sieving apparatus 3 The particles a may be dropped (charged) onto the conveyor belt 1 or the rotating drum 5 via a chute or the like.
Although there is no special restriction | limiting in the granular material a used as the process target by this invention, For example, slag, such as iron manufacture slag, iron ore tailing, etc. are mentioned. Especially, this invention is suitable for isolation | separation of the ferromagnetic material (iron content) in slag (especially steelmaking slag, such as hot metal pretreatment slag, converter decarburization slag). The granular material a is preferably sufficiently crushed and pulverized in advance so that the ferromagnetic material can be separated as much as possible.

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

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

a granular material 1 conveyor belt 2 magnetic separator 2x rotary drum type magnetic separator 3 sieve device 4 magnet pulley 5 rotary drum 6 conveyor belt 7 magnet 10 conveyor terminal 11 conveyor start 30 supply

Claims (14)

A separation method for separating ferromagnetic particles from a powder (a) containing ferromagnetic particles by magnetic separation,
On the conveyor belt (1), the granular material (a) is deposited in a state of particle size segregation so that the particle size gradually becomes coarser from one side to the other side in the width direction of the conveyor belt. A method for separating a ferromagnetic material, wherein a) is conveyed by a conveyor belt (1) and supplied to a magnetic force sorting section (2). Above the conveyor belt (1), a sieve device (3) configured so that the mesh opening of the sieve gradually increases from one side to the other side in the conveyor belt width direction,
By supplying the granular material (a) to the sieving device (3) from the end of the side having the smallest sieve opening, the granular material (a) having passed through the sieving device is transferred to the conveyor belt (1). 2. The method for separating a ferromagnetic material according to claim 1, wherein the particle size is segregated so as to gradually become coarser from one side to the other side in the conveyor belt width direction. .   The method for separating a ferromagnetic material according to claim 1 or 2, characterized in that the sieving device (3) comprises an inclined sieve or a rotary inclined sieve.   The method for separating a ferromagnetic material according to any one of claims 1 to 3, wherein the conveyor belt (1) and the magnetic separator (2) are each composed of a conveyor belt and a magnetic pulley of a pulley type magnetic separator. .   The method for separating a ferromagnetic material according to any one of claims 1 to 3, wherein the magnetic separator (2) comprises a suspended magnetic separator or a rotary drum magnetic separator. A separation method for separating ferromagnetic particles from a powder (a) containing ferromagnetic particles by magnetic separation,
With respect to the rotating drum (5) of the rotating drum type magnetic separator (2x), the particle size (a) is such that the particle size gradually increases from one side to the other side in the rotating drum width direction. A method for separating a ferromagnetic material, wherein the ferromagnetic material is supplied in a segregated state. Above the rotating drum (5) is arranged a sieve device (3) configured such that the opening of the sieve increases sequentially from one side to the other side in the width direction of the rotating drum,
The granular material (a) that has passed through the sieve is supplied to the rotating drum (5) by supplying the granular material (a) to the sieving device (3) from the end of the side having the smallest sieve opening. The separation of the ferromagnetic material according to claim 6, wherein the particle size is segregated so that the particle size gradually increases from one side to the other side in the width direction of the rotating drum. Method.   The method for separating a ferromagnetic material according to claim 6 or 7, characterized in that the sieving device (3) comprises an inclined sieve or a rotary inclined sieve. A separator for separating ferromagnetic particles from a powder (a) containing ferromagnetic particles by magnetic separation,
Conveyor belt (1) for conveying the powder (a), sieve device (3) disposed above the conveyor belt (1), and powder (a) conveyed by the conveyor belt (1) Including a magnetic force sorting section (2) to which
The sieving device (3) is configured such that the sieve mesh size increases sequentially from one side of the conveyor belt width direction to the other side, and the sieving device has a powder at the end of the side with the smallest sieve mesh size. A separator for a ferromagnetic material, comprising a supply unit (30) for the granular material (a).   10. The ferromagnetic separation device according to claim 9, wherein the sieving device (3) comprises an inclined sieve or a rotary inclined sieve.   11. The ferromagnetic separator according to claim 9 or 10, wherein the conveyor belt (1) and the magnetic separator (2) comprise a conveyor belt and a magnet pulley of a pulley type magnetic separator, respectively.   11. The ferromagnetic separator according to claim 9 or 10, wherein the magnetic separator (2) comprises a suspended magnetic separator or a rotary drum magnetic separator. A separator for separating ferromagnetic particles from a powder (a) containing ferromagnetic particles by magnetic separation,
A rotary drum type magnetic separator (2x), and a sieve device (3) disposed above the rotary drum (5) of the rotary drum type magnetic separator (2x),
The sieving device (3) is configured such that the opening of the sieving is gradually increased from one side to the other side in the width direction of the rotating drum, and at the end of the side having the smallest opening of the sieving A separator for a ferromagnetic material, comprising a supply unit (30) for the granular material (a).   14. The ferromagnetic separating apparatus according to claim 13, wherein the sieving device (3) is composed of an inclined sieve or a rotary inclined sieve.

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