JPH0773682B2 - Drum type magnetic separator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has a magnet disposed inside,
The present invention relates to a drum-type magnetic separator that arranges an outer rotating drum and mainly separates granular or powdery magnetic substances.

[0002]

2. Description of the Related Art In a conventional drum type magnetic separator 50, as shown in FIGS. 5 and 6, a fixed magnet 52 is arranged in an arc shape inside a rotary drum 51 which rotates at a low speed with respect to a rotary drive source. A liquid containing iron, which is an object to be treated, is supplied from the above, is adsorbed to the magnetically cohesive zone 53 of the rotary drum 51, is transferred to the non-magnetically cohesive zone 54, and is separated and removed by a skinmer 55 or the like. .

[0003]

However, when the liquid is oil or an oil-mixed liquid, it has a certain degree of viscosity, so that it easily adheres to the periphery of the rotary drum 51, and the magnetic substance contained in the liquid is oil or oil. Since it moves in the mixed liquid and is attracted by a specific fixed magnet inside, there is a problem that it may not move smoothly on the rotary drum 51. Therefore, the linear protrusion 56 is formed around the rotary drum 51.
The skinmer 5 is provided with a scraping member forcibly moving the magnetic substance and rotating by the motor.
Although it has been removed by means of No. 5, in the case of a magnetic substance in a highly viscous liquid such as oil or an oil-mixed liquid, the rotary drum 51
There is a problem that the magnetic substance adheres to the peripheral surface of the sheet and the linear protrusions 56 interfere with the skinmer 55, resulting in extremely poor peeling efficiency. Therefore, in order to solve such a problem, the present inventor eliminates the linear protrusion 56, and instead of the skinmer 55, a pressing plate, which is an example of a scraping member, is obliquely attached to the rotary drum. An attempt was made to remove the attached magnetic substance, but without the linear projection 56, the magnetic substance was attracted by the inner magnet and slipped on the surface of the rotating drum, causing a problem that the magnetic substance did not move smoothly. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a drum-type magnetic separator capable of easily separating magnetic substances contained in a liquid having a relatively high viscosity.

[0004]

A method according to the above-mentioned object.
The drum-type magnetic separator described above has a large number of magnets arranged in a circular arc inside a rotating cylindrical drum in a fixed state to form a magnetic cohesive zone on the surface of the cylindrical drum from its lower portion to its top portion. Drum-type magnetic separator for adsorbing the magnetic substance to be separated on the surface of the cylindrical drum and moving the magnetic substance to the non-magnetic zone by the rotation of the cylindrical drum to take out the magnetic substance from the surface of the cylindrical drum. The plurality of magnets are arranged close to each other with adjacent magnets having different polarities, and a raw material supply port is provided on the lower side of the cylindrical drum on the front side in the rotation direction of the cylindrical drum and on the opposite side. A bottom arc-shaped processing tank with a discharge port is arranged with a gap, and
The magnetic material scraping member is arranged so as to be pressed against the non-magnetic band of the cylindrical drum, and the magnetic band is formed by a magnetic field portion in which the magnetic field is gradually weakened in the rotation direction of the cylindrical drum. Further, the magnetic field of the magnetically adhering portion on the outlet side in the rotation direction of the magnetically adhering zone becomes weaker toward the non-magnetic field portion. In addition, here, "adjacent magnets having different polarities" means that one magnetic pole of the adjacent magnets facing the cylindrical drum is an N pole, and the other magnetic pole is an S pole.
It is a pole.

[0005]

In the drum type magnetic separator according to claim 1, since the adjacent magnets arranged inside the cylindrical drum are adjacent to each other with the adjacent magnets having different polarities,
Since the magnetic field formed on the surface of the cylindrical drum continues without a large change in magnetic strength, the magnetic force attached to the cylindrical drum by the rotating force of the cylindrical drum, after passing,
It is possible to move smoothly without being pulled back by the magnet arranged at the back position in the rotational direction. The magnetic cohesive band is composed of a magnetic cohesive portion in which the magnetic field is gradually weakened in the rotational direction of the cylindrical drum, and the magnetic field of the magnetic cohesive portion on the outlet side in the rotational direction of the magnetic coherent belt is weakened toward the non-magnetic field portion. Therefore, after passing, the magnetic substance moves without being pulled back by the magnet, and thereby smoothly moves to the non-magnetized zone. Therefore,
On the surface of the cylindrical drum, it is not necessary to have a scraper composed of linear protrusions for forcibly moving the magnetic substance, and by disposing a scraping member that presses against the cylindrical drum in the non-magnetic band, the magnetic substance is removed. It can be removed from the cylindrical drum.

[0006]

【Example】

Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a schematic configuration diagram of a drum type magnetic separator according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of an experiment, FIG. 3 is a graph showing an experimental result, and FIG. 4 is an arrangement of a cylindrical drum and a magnet. FIG. 4 is a developed view showing the magnetic field strength of the magnetic cohesive zone on the downstream side.

As shown in FIG. 1, a drum type magnetic separator 10 according to an embodiment of the present invention includes a cylindrical drum 11 connected to a rotary drive source (not shown) and a small distance inside the cylindrical drum 11. A magnet group 12, which is disposed side by side, a treatment tank 15 having a supply port 13 and a discharge port 14 for the liquid to be treated, and a scraping member 16 disposed on the downstream side of the cylindrical drum 11. Consists of These will be described in detail below.

The cylindrical drum 11 and the processing tank 15 are made of a non-magnetic material and are made of a stainless plate which is not easily corroded. A fixed cylinder 17 made of iron is arranged inside, and a small gap is provided around the fixed cylinder 17. A magnet group 12 composed of a large number of magnets is arranged to form a magnetic cohesive zone 18 on the surface of the cylindrical drum 11 and a non-magnetic cohesive zone 19 in which no magnet is disposed inside. ing. In FIG. 1, α represents a magnetic cohesive band angle and β represents a non-magnetic cohesive band angle. The processing tank 15 is provided with a processing liquid supply port 13 on one side and a discharge port 14 on the other side, and the supply port 13 is provided so that the supplied processing liquid is sufficiently in contact with the magnetic band 18 of the cylindrical drum 11.
The liquid flowing from the discharge port 14 to the discharge port 14 passes through the arc-shaped bottom portion 20 formed corresponding to the lower portion of the cylindrical drum 11. A scraping member 16 is pressed against the non-magnetic band 19 of the cylindrical drum 11 to remove the adhered magnetic substance such as iron powder and to flow to the magnetic substance discharge port 22 along the slope 21.

The magnet group 12 forming the magnetic cohesive zone 18 is
Magnets adjacent to each other are arranged on the surface of the fixed cylinder 17 so as to have different polarities, and as shown in FIG. 4, from the supply port 13 side, that is, along the rotation direction of the cylindrical drum 11,
(T) x 52 (l) x 70 (w) mm strong magnets 23 (trade name, NEOMAX-37) with 7 gaps of about 18 mm, and 32 (t) x 52 (l) × 70
(W) mm size powerful magnet 24 (trade name, NEOMA
X-37) with one gap of about 18 mm, 16
7 (t) × 52 (l) × 70 (w) mm strong magnets 25 (trade name, NEOMAX-37) with a gap of about 18 mm, and 6 (t) × 52 (l) × 70 (w)
mm size strong magnet 26 (trade name, NEOMAX-3
7) has 7 with a gap of about 18 mm, and 17.5
Two ferrite magnets (t) × 51 (l) × 131 (w) mm, which are relatively weak in magnetism, are sequentially arranged,
By these, the downstream side (that is, the rotating direction of the cylindrical drum)
To form a magnetically adhering portion that gradually weakens toward. The gap between the magnets 23 to 25 and the cylindrical drum 11 is about 6 mm.

The magnets 23 to 25 are extremely strong magnets. As shown in FIG. 2, a magnet 24 having a thickness (t) of 32 mm is used. When the gap is about 18 mm as shown in FIG. , A point of 5600 gauss and b point of 4700 gauss are generated. As shown in FIGS. 2 and 3, while using the magnet 24 to slowly rotate the cylindrical drum 11, a magnetic substance in oil (hereinafter, simply referred to as oil) containing iron, which is an example of a processing liquid, is used. It was confirmed that when the difference in magnetic force between the points a and b was 1000 gauss or more, the pullback phenomenon by the upstream magnet occurred. Also, the interval is 1
If it is within 8 mm, the part where the thickness of the magnet gradually changes,
That is, the magnetic substance can be smoothly moved even in a portion changing from 46 mm to 32 mm, a portion changing from 32 mm to 16 mm, a portion changing from 16 mm to 6 mm, and finally when an iron plate is used. Was confirmed. The axial gap between the magnets 23 to 27 was about 15 mm.

In this embodiment, a strong magnetic field is generated below the cylindrical drum 11 in order to separate the magnetic substance from the processing liquid, and after the magnetic substance is separated, a relatively strong magnetic field is generated in a portion having a large rising angle. In the part where the ascending angle is small, a medium magnetic field is generated to save the magnet. Then, in the boundary portion from the magnetically cohesive zone 18 to the non-magnetically cohesive zone 19, the strength of the magnetic field is gradually weakened as shown in the lower diagram of FIG. And the magnetic field strength on the surface of the cylindrical drum is gradually weakened so that the adhered magnetic substance smoothly moves to the non-magnetized zone 19.

Therefore, when the drum-type magnetic separator 10 is used, when the oil containing iron, which is an example of the processing liquid, is supplied from the supply port 13 while gradually rotating the cylindrical drum 11, an arc shape is obtained. Outlet 14 through bottom 20
The oil flows to the side. In this process, the magnetic substance contained therein is adsorbed by the magnetism generated by the magnet 23 and adsorbed inside the cylindrical drum 11.
It rotates counterclockwise with the rotation of 1. Then, while the magnetic substance is further attracted to the cylindrical drum 11 by the magnets 24 to 26, the magnetic substance rises to the top, but the oil separated from the magnetic substance is discharged from the discharge port 14 to the outside. The magnetic substance is weakly attracted to the cylindrical drum 11 by the ferrite magnet 27 and moves to the non-magnetized zone 19. Also in this case, due to the viscosity of the oil, the magnetic substance directly adheres to the cylindrical drum, is peeled off by the brass scraping member 16, and is discharged from the magnetic substance discharge port 22. by this,
Over 90% of the magnetic material is separated.

In the present embodiment, a ferrite magnet is used at the end of the magnetic cohesive zone to gradually weaken the magnetism. From the magnetic field to the non-cohesive zone. Specifically, there are means such as changing the type of magnet, changing the thickness of the magnet, and changing the arrangement of the magnets. Applies.

[0014]

The drum type magnetic separator according to claim 1 is
As is clear from the above description, since the adjacent magnets have different polarities and are close to each other, there is no portion where the magnetic field strength greatly changes, and the magnetic force adhered to the cylindrical drum by the rotational force of the cylindrical drum disappears. The object smoothly moves in the magnetic field formed on the surface of the cylindrical drum by a large number of magnets, and the magnetic field on the surface of the rotating drum is the non-magnetic field in the downstream magnetic field that is in contact with the non-magnetic field. Since it becomes weaker toward, and the magnetic substance is smoothly moved from the magnetic cohesive zone to the non-magnetic cohesive zone, the linear drum, the scraper, or the like is not necessary on the cylindrical drum, thereby, The scraping member capable of substantially completely peeling the magnetic substance from the cylindrical drum can be pressed to continuously perform the treatment, and the magnetic substance can be efficiently separated from the treatment liquid.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a drum type magnetic separator according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an experiment conducted to confirm the action and effect of the present invention.

FIG. 3 is a graph showing experimental results.

FIG. 4 is a development view showing the arrangement of a cylindrical drum and a magnet, and the vertical axis of the graph described below shows the magnetic field strength.

FIG. 5 is a schematic configuration diagram of a drum type magnetic separator according to a conventional example.

FIG. 6 is a development view of the same.

[Explanation of Codes] 10 Drum Type Magnetic Separator 11 Cylindrical Drum 12 Magnet Group 13 Supply Port 14 Discharge Port 15 Processing Tank 16 Scraping Member 17 Fixed Cylinder 18 Magnetic Coupling Zone 19 Non-Magnetic Coupling Zone 20 Circular Bottom 21 Slope 22 Magnetic Object discharge port 23 Magnet 24 Magnet 25 Magnet 26 Magnet 27 Ferrite magnet

Claims (1)

[Claims] 1. A large number of magnets are arranged in an arc shape in a fixed state inside a rotating cylindrical drum to form a magnetic cohesive zone on the surface of the cylindrical drum from its lower part to its top, and the magnetic cohesive zones are to be separated. A drum-type magnetic separator for adsorbing a magnetic substance to the surface of the cylindrical drum and moving the magnetic substance to a non-magnetic zone by rotation of the cylindrical drum to take out the magnetic substance from the surface of the cylindrical drum, The plurality of magnets are arranged close to each other with adjacent magnets having different polarities. A raw material supply port is provided on the lower side of the cylindrical drum in the rotational direction of the cylindrical drum, and a raw material discharge port is provided on the opposite side. The bottom arcuate processing tank is disposed with a gap, and the magnetic material scraping member is disposed in pressing contact with the non-magnetic band of the cylindrical drum, and the magnetic band is A magnetic field directed in the direction of rotation of the cylindrical drum Will by sequential weaker magnetically attached portion, further drum magnetic separator where the magnetic field of the magnetically attached portion in the rotational direction outlet side of the magnetic attachment strip is characterized in that weakened towards the non-magnetic portion.