JPH11309383A - Magnetic separator with spiral magnetic pole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic separator with a spiral magnetic pole which is suitable for removing a magnetically attracted material or a magnetically not-attracted material from a raw material with a higher grade. SOLUTION: The magnetic separator 10 is equipped with a hollow drum 17 consisting of nonmagnetic material, many magnets forming magnetic poles which are arranged in the inside of the hollow drum 17 while keeping a little opening, and a supporting member for supporting the many magnets. The hollow drum 17 is rotated relatively for the magnetic poles fitted to the supporting member. The magnetic poles are spirally fitted to the supporting member and also the spirally fitted adjacent magnetic poles are made to different poles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum type magnetic separator for separating magnetic powder and non-magnetic powder, and in particular, to remove and separate a small amount of non-magnetic powder from a powder containing a large amount of magnetic powder. The present invention relates to a spiral magnetic pole separator that exhibits an excellent effect in all cases.

[0002]

2. Description of the Related Art Generally, in order to remove and separate a small amount of magnetic powder from a powder containing a large amount of non-magnetic powder, the purpose can be easily achieved by using a strong magnet. However, it has been extremely difficult to separate and remove a small amount of non-magnetic powder from a powder containing a larger amount of magnetic powder than a non-magnetic powder. The reason is that when the magnetic powder is adsorbed on the magnetic pole,
First, it was coagulated (agglomerated) and adsorbed, and involved a small amount of nonmagnetic powder contained therein.
Also, in the case of completely removing the magnetic powder contained in the non-magnetic powder using a strong magnet, efficient magnetic separation was difficult because the non-magnetic powder was slightly entangled with the magnetic powder for the above-mentioned reason. .

[0003]

On the other hand, there is a strong need to separate and remove a small amount of non-magnetic powder derived from a refractory or the like from iron powder used for powder metallurgy, or a ferromagnetic ore such as iron sand or ilmenite. In the case of magnetic separation, there is a need to obtain a high-quality powder that contains as little non-magnetic powder as possible, and there are many known needs in other various industrial fields to remove trace amounts of non-magnetic powder contained in magnetic powder. ing. However, for the reasons described above, at present, no magnetic separator that meets these needs has been developed. Furthermore, in the conventional magnetic separator, even when the magnetic powder contained in a small amount in the non-magnetic powder is completely removed by a strong magnet, it is possible to realize a high-efficiency magnetic separation in which the magnetic powder contains almost no non-magnetic powder. It was difficult. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a spiral magnetic pole magnetic separator suitable for removing magnetically attached material or non-magnetically attached material from a raw material with higher quality.

[0004]

According to the present invention, there is provided a semiconductor device comprising:
The spiral magnetic pole separator described has a hollow drum made of a non-magnetic material, a large number of magnetic poles arranged with a small gap inside the hollow drum, and a support member for supporting the large number of magnetic poles. In the magnetic separator, wherein the hollow drum rotates relative to the magnetic pole attached to the support member, the magnetic pole is attached to the support member in a spiral shape, and the adjacent magnetic pole is attached to the support member in a spiral shape. The magnetic pole is a different pole. Here, the magnetic pole means an N pole or an S pole of a magnet (including a permanent magnet and an electromagnet).

The operation of the spiral magnetic pole magnetic separator according to claim 1 will be described. By fixing a support member around which a large number of magnets are attached (hereinafter, these are referred to as magnetic pole bodies),
The magnetic body is rotated by rotating the hollow drum or vice versa. As a result, the hollow drum rotates relative to the magnetic pole body. In this state, for example, a powder containing a large amount of magnetic powder is supplied to a part of the upper surface of the hollow drum by a suitable amount feeder.

At this time, the magnetic powder is fluffed immediately above one magnetic pole of the magnetic pole body, so that the non-magnetic powder originally contained in the input magnetic powder is replaced with the fluffy magnetic powder (hereinafter simply referred to as “fluff”). ) May be dropped and separated by the action of centrifugal force of gravity and rotation. Then, while the fluffy magnetic powder is moving to the next magnetic pole, the fluffy magnetic powder overlaps and falls asleep, and the fluffy state collapses. Is rebuilt. By repeating such a process, each magnetic powder moves so as to make one rotation for every two magnetic poles while repeating the rearrangement of the particles. In this process, each time the non-magnetic powder entrained in the magnetic powder appears on the surface of the fluffy magnetic powder, the non-magnetic powder is sequentially dropped and separated to improve the quality of the magnetic powder. Here, by arranging a large number of magnetic poles on the magnetic pole body in a spiral shape, the probability that the non-magnetic powder appears on the surface of the fluffy magnetic powder (that is, the outermost part) becomes extremely high, so that the non-magnetic powder is removed to the limit. I can do it.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. In this embodiment,
In order to simplify the description, a case where a permanent magnet is used for magnetic pole molding will be described. Here, FIG. 1 is a front view of a magnetic pole body including a support member to which a number of magnets are attached, which is used in a spiral magnetic pole magnetic separator according to an embodiment of the present invention, and FIG. FIG. 3 is a partial side sectional view of the spiral magnetic pole magnetic separator. In a spiral magnetic pole magnetic separator 10 (see FIG. 2) according to an embodiment of the present invention, as shown in FIGS. 1 and 3, a magnetic pole body 12 composed of a support member having a large number of magnets 11 forming magnetic poles attached thereto. Is made of a steel pipe or the like, and flanges 13, 14 and shafts 15, 16 are attached to both ends thereof. The magnet 11 may be a ferrite magnet, a neodymium magnet, or the like.
Since various types of permanent magnets can be used to obtain magnetic fields having their respective characteristics, they can be selected according to the characteristics of the powder to be sorted.

[0008] As shown in the figure, the magnet 11 is made of a magnetic pole body 1 with an adhesive or the like in a spiral shape so that adjacent magnetic poles have different polarities.
2 attached. In addition, it can also be attached using a pole piece or a yoke. Further, in the figure, the magnet 11 and the magnet 11 are attached so as to be in contact with each other, but the same effect can be obtained even if the magnet 11 is attached at a fixed interval. FIG. 2 is a front view showing a usage state of the spiral magnetic pole separator 10 according to one embodiment of the present invention. As shown in FIGS. 2 and 3, a magnetic pole body 12 in which a large number of magnets 11 are arranged with a small gap is coaxially arranged inside a hollow drum 17 made of a nonmagnetic material such as a stainless steel pipe. It is provided in. On both sides of the hollow drum 17, a flange 1
8, 19 and bearings 20 and 21 are made of hollow drum 1 made of magnetic powder or the like.
7 so that it does not enter the inside.

In this embodiment, the hollow drum 17 is rotated, and the magnetic pole body 12 on which the magnet 11 is mounted is fixed. The V pulley 23 is attached to the hollow drum 17, and the V belt is driven by a deceleration motor (not shown). , So as to rotate in the direction of arrow 24. Contrary to this embodiment,
A method in which the hollow drum is fixed and the magnetic pole body is rotated can also be used, but the principle of selection is the same.

Now, the powder to be sorted is put into the hopper 25,
A powder 29 composed of a large amount of magnetic powder 27 and a small amount of non-magnetic powder 28 is fed from one end of the hollow drum 17 by the feeder 26.
When the hollow drum 17 is rotated in the direction of the arrow 24 while supplying the powder, the powder 29 moves in the direction of the arrow 30 along the spiral magnetic pole row. The details of the movement of the powder 29 are shown in FIG. FIG. 3 shows the spiral magnetic pole separator 10 of FIG.
Is a partial cross-sectional view when a plurality of magnets 11 are spirally mounted on the surface thereof, and the magnetic pole body 12 is fixed, and the hollow drum 17 coaxially covering the magnetic pole body 12 is indicated by an arrow 24. Is rotating in the direction of. At this time, the magnetic powder 27 also moves spirally in the directions of arrows 30 and 24 as shown in FIGS.

As shown in FIG. 3, when the magnetic powder 27 moves, the magnetic powder 27 becomes fluffy and vertical just above the magnetic pole,
The fluff overlaps between the magnetic poles and lies in a lying state, and the next magnetic pole becomes fluffed vertically again and makes a half turn.
During this time, the non-magnetic powder 28 that has appeared on the surface of the fluff falls and is separated and sorted by the action of gravity and centrifugal force. Powder 29
If the feed amount is appropriate, the fluff that has fluffed immediately above the magnetic poles overlaps between the magnetic poles and lies asleep, the original fluff collapses, and a new fluff is reconstructed at the next magnetic pole. During this time, the non-magnetic powder 28 that has been caught in the magnetic powder 27 appears on the surface of the fluff and falls and is removed one by one. By repeating this process many times, the non-magnetic powder 28 can be separated and removed to the utmost. Here, if the feed amount of the powder 29 is too small, small fluff is sparsely formed,
The fluff is unlikely to be reconstructed, and the non-magnetic powder 28 appears on the surface of the magnetic powder 27 only by making a single rotation at the next magnetic pole and standing upright without changing the configuration of the particles without overlapping with other fluff between the magnetic poles. Since the rate decreases, the magnetic separation efficiency decreases.

On the other hand, if the feed amount of the powder 29 is too large, the magnetic powder 27 is in a dumpling state, folds are formed over several magnetic poles, and move in a spiral shape without rotation of the fluff. , The magnetic separation efficiency is also significantly reduced. For this reason, control of the feed amount of the powder 29 is an extremely important factor, and it is desirable to maintain the magnetic powder 27 in a state shown in FIG.
Furthermore, when the magnetic pole row and the adjacent magnetic pole row are mounted such that the magnetic poles are different from each other,
A part of the magnetic powder 27 may cause a bridge between the magnetic pole rows and jump over the magnetic pole rows, which also slightly lowers the magnetic separation efficiency. Therefore, as shown in FIG.
When the magnetic poles adjacent to each other have the same polarity, the magnetic powder 27 moves orderly and spirally, so that the magnetic separation efficiency increases.

The magnetic powder 27 selected and moved to the other end of the hollow drum 17 is scraped off by a scraping plate 31 to become a selected magnetic powder 32. Note that the scraping plate 31 is fixed to the hollow drum and rotates simultaneously with the hollow drum 17. If the non-magnetic powder 28 contained is fine powder, it may be difficult to fall or separate only by the action of gravity or centrifugal force. In this case, there is a method of blowing a weak wind and forcibly blowing down. When wet magnetic separation is performed in water using the spiral magnetic pole magnetic separator 10 of the present invention, the fine non-magnetic powder 28 can be washed off with water, so that the separation efficiency can be increased. In FIG. 2, reference numerals 33 and 34 represent a nonmagnetic powder hopper and a magnetic powder hopper, respectively.

In order to increase the processing capacity of the spiral magnetic pole magnetic separator, it is preferable to increase the number of magnetic pole arrays, such as a double-thread screw or a triple-thread screw. If it is necessary to separate the intermediate between magnetic and non-magnetic materials (single-edged product in beneficiation engineering), gradually change the magnets in the magnetic pole row from strong to weak magnets, or Can be separated into a truncated cone by gradually increasing the distance from the hollow drum.

The embodiment of the present invention has been described above.
The present invention is not limited to these embodiments, and all changes in conditions without departing from the gist are within the scope of the present invention. For example, in the present embodiment, an example in which a permanent magnet is used has been described. However, the permanent magnet can be replaced with an electromagnet whose polarity direction and magnetic force can be adjusted. For example, it is also possible to electrically switch the polarity of the electromagnet to generate a rotating magnetic field that moves spirally on the surface of the non-magnetic drum without substantially rotating the same, and to exert the same effect. It is possible.

[0016]

According to the first aspect of the present invention, there is provided a spiral magnetic pole magnetic separator comprising a support member for supporting a large number of magnetic poles arranged with a small gap inside a hollow drum made of a nonmagnetic material. In a magnetic separator in which a drum rotates relative to a magnetic pole attached to a support member, the magnetic poles are attached to the support member in a spiral shape, and adjacent magnetic poles attached in a spiral shape have different polarities. In addition, every time the magnetic powder moves along the magnetic pole, the rotation is repeated while the particles are rearranged, so that even a small amount of nonmagnetic powder contained in the magnetic powder can be removed to the utmost. In one example of the experiment, it was possible to carefully select the iron powder for powder metallurgy containing only 0.1% or less of the nonmagnetic substance by magnetic separation until the nonmagnetic substance could hardly be detected. This is a great effect that can be achieved by the magnetic separator according to the present invention, which was extremely difficult with the conventional magnetic separator. In addition, regardless of the ratio of the magnetic powder and the non-magnetic powder in any ratio, the high-quality magnetic powder and the non-magnetic powder can be separated by using the spiral magnetic pole separator according to the present embodiment. As a result, much higher magnetic separation efficiency can be obtained as compared with the conventional magnetic separator.

[Brief description of the drawings]

FIG. 1 is a front view of a magnetic pole body including a support member to which a number of magnets are attached, which is used in a spiral magnetic pole magnetic separator according to one embodiment of the present invention.

FIG. 2 is an explanatory diagram of a usage state of the spiral magnetic pole magnetic separator.

FIG. 3 is a partial side sectional view of the spiral magnetic pole magnetic separator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Spiral magnetic pole magnetic separator 11 Magnet 12 Magnetic pole body 13 Flange 14 Flange 15 Shaft 16 Shaft 17 Hollow drum 18 Flange 19 Flange 20 Bearing 21 Bearing 23 V Pulley 24 Arrow 25 Hopper 26 Feeder 27 Magnetic powder 28 Nonmagnetic powder 29 Powder 30 Arrow 31 scraping plate 32 selected magnetic powder 33 non-magnetic powder hopper 34 magnetic powder hopper

Claims (1)

[Claims] A hollow drum made of a non-magnetic material, a large number of magnetic poles arranged inside the hollow drum with a small gap, and a support member for supporting the large number of magnetic poles, In a magnetic separator in which a hollow drum relatively rotates with respect to the magnetic pole attached to the support member, the magnetic pole is spirally attached to the support member,
Moreover, the adjacent magnetic poles mounted in a spiral form have different polarities.