JPH09187673A - Magnetic separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device by which magnetic separation performance is kept stable for a long time. SOLUTION: In a magnetic separator, materials to be separated 14, 15, 16 are passed through magnetic separation bores in which the gradient of the magnetic field is made in the diameter direction thereof to separate a specified material by the difference of magnetic force exerted on particles of the materials to be separated in the gradient of the magnetic field in the magnetic separation bore. The magnetic separator has a first magnetic separator 100 for separating ferromagnetic particles and a second magnetic separator 200 for separating paramagnetic and diamagnetic particles. The first magnetic separator 100 has a first magnetic field generator 18 for producing the small magnetic field and a first magnetic separation bore 17, and the second magnetic separator 200 has a second magnetic field generator 22 for generating the large magnetic field and a second magnetic separation bore 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic separation device in which a powder or granular material is dropped into a magnetic field and a magnetic field gradient and separated according to a difference in magnetic susceptibility. The present invention is a magnetic separation device for removing sulfur such as pyrite or ash such as kaolinite from pulverized coal, or 3 having different magnetic susceptibility.
It can also be used for devices that magnetically separate more than one type of quality.

[0002]

2. Description of the Related Art Substances each have a unique magnetic susceptibility and can be separated by utilizing the difference in magnetic susceptibility. A conventional magnetic separation device based on this principle is shown in FIG. 2 (conventional example 1) and FIGS. 7 to 8 (conventional example 2). (1) Description of Apparatus 400 of Conventional Example 1 (FIG. 2) By providing the magnetic field generator 2 outside the magnetic separation bore 1, a magnetic field gradient is generated in the magnetic separation bore 1.

When particles are dropped from the supply unit 7 into this magnetic field, the particles 3 having a high magnetic susceptibility are orientated outward due to the magnetic force directed outward by the magnetic field gradient in the magnetic separation bore 1. Can be bent.

On the other hand, the granular material 4 having a low magnetic susceptibility does not change its trajectory because it does not receive a magnetic force or only a weak magnetic force. As a result, in the downstream part of the magnetic separation device,
The particles 3 having a high magnetic susceptibility gather in the outer portion of the magnetic separation bore, and the particles 4 having a low magnetic susceptibility gather near the center of the magnetic separation bore.

Therefore, the particles 8 are separated and collected by providing a collecting portion 8 for the granular material 3 having a large magnetic susceptibility and a collecting portion 9 having a small magnetic susceptibility. The above conventional techniques are in the stage of being examined at the laboratory level.

The types of ferromagnetic particles in the pulverized coal are as follows. (A) FeCO3 (siderite), FeSx (pyrroite), or FeS2 (pyrite) that is originally present in the pulverized coal and has strong magnetism due to local collapse of the crystal structure. (B) Steel crushing mill blade scraps used when crushing coal into pulverized coal.

Since these ferromagnetic particles are mixed in the pulverized coal, it is an obstacle to magnetic separation in the conventional apparatus. (2) Description of Apparatus 500 of Conventional Example 2 (FIGS. 7 to 8) FIG. 7 is a conceptual diagram of a conventional magnetic separation apparatus (Example 2), and FIG. 8 is a flowchart of the conventional magnetic separation apparatus (Example 2). .

In the magnetic separation bore 504, a magnetic field gradient and a magnetic field are generated from the outside by the superconducting quadrupole magnet 501. The magnetic field has a zero magnetic field at the center of the bore, and the magnetic separation bore 5
As it gets closer to the inner wall of 04, it becomes stronger concentrically.

As shown in FIG. 7, a recovery pipe 507 is provided inside the magnetic separation bore, and the separation pipe 5 is provided inside the lower portion thereof.
08 is arranged coaxially. Separation material (ferromagnetic particle 523 and paramagnetic particle 52 having a large magnetic susceptibility) having a relatively large magnetic susceptibility and whose orbit can be largely changed by a magnetic separation device
2) and a non-separated substance (paramagnetic particles 521 having a small magnetic susceptibility), which has a small magnetic susceptibility and whose orbit hardly changes and is not separated, are supplied from the supply pipe 509 into the recovery pipe 507. By means of free fall,
When passing through the magnetic separation bore 504, sufficient magnetic force is exerted on the separated substance to move in the radial direction, but almost no magnetic force is exerted on the non-separated substance.

As a result, after passing through the magnetic separation bore 504, the separated substances (the ferromagnetic particles 523 and the paramagnetic particles 522 having a high magnetic susceptibility) are separated from the non-separated substances (magnetized particles) by the outside near the inner wall of the recovery tube 507. Paramagnetic particles 521 with a small rate)
On the contrary, it leans toward the center.

The group of particles that are curled toward the center and the group of particles that are curled toward the outside are separated by a separation tube 508, and the separation tube 5
The substance collected in 08 is collected in the non-separated substance collection container 513, and the substance remaining in the collection pipe 507 is collected in the separated substance collection container 512.

The superconducting quadrupole magnet 501 is cooled to a cryogenic temperature in the cryostat 502. On the other hand, since the inside of the magnetic separation bore 504 is almost room temperature, a heat insulating structure 503 is provided to perform heat insulating processing.

[0013]

[Problems to be Solved by the Invention]

(1) In the conventional magnetic separation device (Example 1), all kinds of particles such as ferromagnetic particles, paramagnetic particles, and diamagnetic particles were simultaneously supplied to the magnetic separation device, so that there was the following problem. .

(A) Ferromagnetic particles have an order of magnitude larger magnetic susceptibility and stronger magnetic force than paramagnetic particles and diamagnetic particles, and therefore adhere to the inner wall of the magnetic separation bore and block the magnetic separation bore. It may interfere with continuous operation by reducing the generated magnetic field.

(B) When the magnetic field for magnetic separation is generated by the superconducting coil in the persistent current mode, the hysteresis loss in the magnetic history of the ferromagnetic particles absorbs the energy of the magnetic field and attenuates the persistent current. , The generated magnetic field is reduced and the magnetic separation ability is reduced.

[0016] For example, when a superconducting coil current is closed loop using a persistent current switch to operate in a persistent current mode in which a strong generated magnetic field can be retained without loss, the superconducting coil has an advantage in operating cost. However, when the ferromagnetic particles pass through the magnetic separation device, the hysteresis energy as shown in FIG. 3 is taken from the magnetic field.

Therefore, the permanent current is attenuated and the generated magnetic field,
Also, the magnetic field gradient is reduced and the magnetic separation ability is reduced. Therefore, there is no problem when the amount handled is small, but a problem occurs when a large amount is handled in continuous operation. (2) In the conventional magnetic separation device (Example 2), in order to efficiently separate and remove paramagnetic particles having a large magnetic susceptibility, if the strength of the magnetic field generated by the superconducting quadrupole magnet is increased, ferromagnetic particles become ferromagnetic particles. There was a problem that the magnetic force applied became too strong and ferromagnetic particles adhered to the wall of the recovery tube, causing the recovery tube to become clogged. The present invention aims to provide a device capable of solving these problems.

[0018]

[Means for Solving the Problems]

(First Means) In the magnetic separation device according to the present invention, the substance to be separated is passed through the magnetic separation bore having a magnetic field gradient in the radial direction of the magnetic separation bore, and the substance to be separated is generated in the magnetic field gradient in the magnetic separation bore. (A) a first magnetic separation device for separating ferromagnetic particles and (B) a first magnetic separation device for separating paramagnetic and diamagnetic particles in a magnetic separation device for separating a specific substance due to the difference in magnetic force acting on the particles of (C) the first magnetic separation device has a first magnetic field generation device having a small generated magnetic field;
The first magnetic separation bore is provided, and only the ferromagnetic particles are separated from the substance to be separated supplied from the first supply unit and recovered in the first recovery unit, and the paramagnetic particles and the diamagnetic particles are recovered in the second recovery unit. (D) The second magnetic separation device has a second magnetic field generation device having a large generated magnetic field and a second magnetic separation bore, and is collected from the second collection part and second supply part. It is characterized in that only paramagnetic particles having a high magnetic susceptibility are separated from the supplied substance to be separated and recovered in the third recovery section, and paramagnetic particles and diamagnetic particles having a low magnetic susceptibility are recovered in the fourth recovery section. And

Therefore, it operates as follows. In the particles to be separated, first, only the ferromagnetic substance is removed by the first magnetic separation device, and only the paramagnetic particles and the diamagnetic particles enter the second magnetic separation device.

Next, in the second magnetic separation device, (A) particles having a large magnetic susceptibility among paramagnetic particles and (B) particles having a small magnetic susceptibility among paramagnetic particles and diamagnetic particles are magnetically separated.

Therefore, in the second magnetic separation device downstream,
No ferromagnetic particles are supplied. Therefore, the problem that the ferromagnetic particles adhere to the downstream magnetic separation device does not occur. Moreover, since the paramagnetic particles have the magnetization characteristics as shown in FIG. 4, there is no hysteresis loss in the magnetic history.

Similarly, since diamagnetic particles do not have hysteresis loss, it is possible to prevent loss of magnetic field energy and attenuation of permanent current due to hysteresis loss. (Second Means) In the magnetic separation device according to the present invention, the magnetic field is zero in the center and the magnetic separation bore of the superconducting quadrupole magnet for generating a magnetic field having a magnetic field gradient in the radial direction of the magnetic separation bore is separated. An open-gradient magnetic separation device that separates a specific substance through the substance by utilizing the difference in magnetic force acting on the substance particles to be separated in a magnetic field gradient in the magnetic separation bore (A)
Magnetic separation bore, (B) first supply pipe and second supply pipe, (C) first recovery pipe and second recovery pipe, (D) first
A separation pipe and a second separation pipe, (E) a first separated substance collection container, a second separated substance collection container, and a third separated substance collection container, and (F) the magnetic separation bore is a superconducting tube. The polar magnet has a zero magnetic field at the center of the magnetic separation bore, and has a magnetic field that becomes concentrically strong as it approaches the inner wall of the magnetic separation bore. (G) A second recovery tube is provided inside the magnetic separation bore.
(H) A first recovery pipe is provided inside the second recovery pipe,
(I) A first supply pipe for supplying a substance to be separated to the recovery pipe is provided above the first recovery pipe, and a second supply pipe is provided above the second recovery pipe, and (J) the first recovery pipe is provided. A first separation pipe is provided in the lower part of the pipe, and a second separation pipe is provided in the lower part of the second recovery pipe. (K) The first supply pipe mixes magnetic particles and non-magnetic particles supplied from the outside. First powder (P)
(L) The first separation pipe supplies (L) the first separation pipe to the paramagnetic particles having a small magnetic susceptibility and the large magnetic susceptibility among the mixed powder P of the magnetic particles and the non-magnetic particles that have passed through the first recovery pipe. The paramagnetic particles are separated, and (M) the first separated substance recovery container recovers the ferromagnetic particles that have not entered the first separation tube from the mixed powder P that has passed through the first recovery tube. (N) The substance A discharged from the first separation pipe is once lifted on the magnetic separation device and then supplied to the second recovery pipe through the second supply pipe, and (O) the second separation substance. The recovery container recovers the paramagnetic particles having a large magnetic susceptibility from the substance A that has passed through the second recovery pipe, and (P) the third separated substance recovery container has the property A that has passed through the second recovery pipe. It is characterized in that paramagnetic particles having a small magnetic susceptibility are collected.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
Shown in In FIG. 1, the granular material to be separated is pulverized coal, and the pulverized coal which is the particle to be separated is (1) an organic substance which is an active ingredient (in FIG. 14), and (2) pyrite (chemical formula FeS2, sulfur content), kaolinite (chemical formula Al2
Si2 O5 (OH) 4, main component of ash), siderite (chemical formula FeCO2), etc. (pyrite, kaolinite,
Siderite is a paramagnetic particle having a relatively large magnetic susceptibility and corresponds to particle 15 in FIG. ) And (3) a small amount of ferromagnetic material, pyrotite (chemical formula FeSx (1.0 <x <1.
14), the sulfur content) (this corresponds to the particles 16 in FIG. 1).

Therefore, first, the first
Only the particles 16 that are ferromagnetic particles are separated by the magnetic separation device (magnetic separation device for ferromagnetic particle separation) and collected by the first recovery unit (ferromagnetic particle recovery unit) 19.

However, particles 1 that are paramagnetic or diamagnetic
4, 15 are not separated. This is because the first magnetic field generator (magnetic field generator for a magnetic separation device that targets only ferromagnetic particles) 18 has a small generated magnetic field, and therefore exerts a magnetic force on the particles 14 and 15 that are paramagnetic or diamagnetic. Because there is no.

Next, the substance to be separated from which only the strong magnetic particles 16 have been separated and removed is paramagnetic or diamagnetic particles 14 and 15.
Therefore, separation is performed by the second magnetic separation device (magnetic separation device for paramagnetic particle separation) 200 arranged below the first magnetic separation device.

At this time, in the conventional device, the ferromagnetic particles 6
Is mixed, the ferromagnetic particles adhere to the inner wall of the magnetic separation bore, clogging the diameter of the magnetic separation bore, or reducing the generated magnetic field, leading to a decrease in separation ability. Since the magnetic field is separated by the first magnetic separation device and collected, such a problem is prevented and continuous stable operation is possible.

When the second magnetic field generator (magnetic field generator for separating paramagnetic particles) 22 is used in the permanent current mode of the superconducting coil, the permanent current is not attenuated and continuous stable operation is possible. is there.

Also in this case, when the ferromagnetic particles are mixed, the permanent current is gradually attenuated by the hysteresis loss due to the magnetic history of the ferromagnetic particles in the conventional device, so that continuous stable operation is impossible. In the device of the present invention, such a problem can be prevented because the first magnetic separation device collects the magnetic field. (Second Embodiment) FIG. 5 shows the second embodiment of the present invention.
6 to FIG.

FIG. 5 is a conceptual diagram of a magnetic separation device according to the second embodiment of the present invention, and FIG. 6 is a flow chart of the magnetic separation device according to the second embodiment of the present invention. As shown in FIG. 5, the superconducting quadrupole magnet 301, the cryostat 302, and the heat insulating structure 303 are arranged in the same manner as in the conventional magnetic separation device.

In the magnetic separation bore 304, first, the second recovery pipe 307 is arranged, and the first recovery pipe 307 is arranged on the inside of the second recovery pipe 307 on the axis of the magnetic separation bore.
A collection pipe 305 is arranged. A first supply pipe 309 and a second supply pipe 310 for supplying the substance to be separated to the recovery pipe are inserted in the upper portions of the first recovery pipe 305 and the second recovery pipe 307, respectively.

A first separation pipe 306 and a second separation pipe 308 are provided below the recovery pipe on the magnetic separation bore axis. Ferromagnetic particles 323 and paramagnetic particles 3 having a high magnetic susceptibility
22 and the substance P in which the paramagnetic particles 321 having a low magnetic susceptibility are mixed and passed through the first recovery pipe 305 through the first supply pipe 309, the paramagnetic particles 321 having a low magnetic susceptibility and the paramagnetic particles having a high magnetic susceptibility are obtained. 322 enters the first separation tube 306, and the remaining ferromagnetic particles 323 pass through the first recovery tube 305 and are collected in the first separated substance recovery container 311.

Substance A discharged from the first separation pipe 306
Is once lifted above the magnetic separation device 300 and supplied to the second recovery pipe 307 through the second supply pipe 310. The substance A discharged from the first separation pipe 306 is collected in the second separation substance recovery container 312 while the paramagnetic particles 322 having a high magnetic susceptibility are attracted to the outside while passing through the second recovery pipe 307. To be done.

On the other hand, paramagnetic particles 321 having a small magnetic susceptibility
Passes through the second separation pipe 308 to the third
It is recovered in the separated substance recovery container 313. As aforementioned,
In the invention according to the second embodiment, two recovery tubes are arranged on the shaft in the magnetic separation bore of the open gradient type magnetic separation device, and particles not separated by the inner recovery tube 305 are It is characterized in that a supply pipe for supplying to the outer recovery pipe 307 is provided.

[0035]

Since the present invention is constructed as described above, it has the following effects. (1) The effect of the invention of claim 1 (A) Since the ferromagnetic particles can be removed from the particles to be separated in advance by the first magnetic separation device, the ferromagnetic particles are contained in the magnetic separation bore separating the paramagnetic particles. Does not adhere.

Therefore, continuous stable operation becomes possible. (B) Since the ferromagnetic particles have been removed from the particles to be separated in advance by the first magnetic separator, only the paramagnetic particles and the diamagnetic particles are the objects to be separated in the second magnetic separator. And there is no hysteresis loss in the magnetic history for paramagnetic particles and diamagnetic particles.

Therefore, the energy of the magnetic field is not lost in the second magnetic separation device. (C) When operating in the persistent current mode, the energy of the magnetic field generated by the superconducting coil is not lost. Therefore, the persistent current is not reduced and the magnetic field of the magnetic separator and the magnetic field gradient are not attenuated.

Therefore, the generated magnetic field is held, continuous stable operation for a long time becomes possible, and stable separation performance of the magnetic separation device can be maintained for a long time. (2) Effects of the inventions of claims 2 and 3 (A) Because the ferromagnetic particles can be removed in the first step, that is, the ferromagnetic particles 323 pass through the first recovery pipe 305, and the first separated substance recovery container 311. Since it is collected in the first place, clogging of the collection pipe can be suppressed.

(B) Normally, the central portion of the magnetic separation bore, which has a low separation efficiency, can be effectively utilized. for that reason,
The separation efficiency of the entire device can be improved. (C) In the invention of claim 1, the separating device has two upper and lower stages, but in the inventions of claims 2 and 3, since the separating device has one stage, the number of coils can be reduced.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a magnetic separation device according to a first embodiment of the present invention.

FIG. 2 is a conceptual diagram of a conventional magnetic separation device (example 1).

FIG. 3 is a diagram showing MH characteristics of ferromagnetic particles.

FIG. 4 is a diagram showing MH characteristics of paramagnetic particles.

FIG. 5 is a conceptual diagram of a magnetic separation device according to a second embodiment of the present invention.

FIG. 6 is a flowchart of a magnetic separation device according to a second embodiment of the present invention.

FIG. 7 is a conceptual diagram of a conventional magnetic separation device (example 2).

FIG. 8 is a flowchart of a conventional magnetic separation device (example 2).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Magnetic separation bore, 2 ... Magnetic field generator, 3 ... Granules with a large magnetic susceptibility, 4 ... Paramagnetic particles or diamagnetic particles with a small magnetic susceptibility, 6 ... Ferromagnetic particles, 7 ... Supply part, 8 ... Magnetization High magnetic susceptibility paramagnetic particle recovery section, 9 ... Small magnetic susceptibility particle recovery section, 10 ... First supply section, 14 ... Small magnetic susceptibility paramagnetic particle or diamagnetic particle, 15 ... Large magnetic susceptibility paramagnetic. Particles, 16 ... Ferromagnetic particles, 17 ... First magnetic separation bore (for separating ferromagnetic particles), 18 ... First magnetic field generator (for separating ferromagnetic particles), 19 ... First recovery unit (for recovering ferromagnetic particles) ), 20 ... Second recovery section / second supply section, 21 ... Second magnetic separation bore (for paramagnetic particle separation), 22 ... Second magnetic field generator (for paramagnetic particle separation), 23 ... Third recovery section (For collecting paramagnetic particles having a large magnetic susceptibility), 24 ... Fourth collecting section (paramagnetic particles having a small magnetic susceptibility) Child recovery), 100 ... First magnetic separation device, 200 ... Second magnetic separation device, 300 ... Magnetic separation device, 301 ... Superconducting quadrupole magnet, 302 ... Cryostat, 303 ... Thermal insulation structure, 304 ... Magnetic separation bore, 305 ... 1st collection pipe, 306 ... 1st separation pipe, 307 ... 2nd collection pipe, 308 ... 2nd separation pipe, 309 ... 1st supply pipe, 310 ... 2nd supply pipe, 311 ... 1st separated substance collection container , 312 ... Second separation material recovery container, 313 ... Third separation material recovery container, 321 ... Paramagnetic particle with low magnetic susceptibility, 322 ... Paramagnetic particle with high magnetic susceptibility, 323 ... Ferromagnetic particle, 400 ... Conventional magnetism Separation device (Example 1), 500 ... Conventional magnetic separation device (Example 2), 501 ... Superconducting quadrupole magnet, 502 ... Cryostat, 503 ... Thermal insulation structure, 504 ... Magnetic separation bore, 507 ... Recovery , 508 ... Separation tube, 509 ... Supply tube, 512 ... Separation material recovery container, 513 ... Non-separation material recovery container, 521 ... Paramagnetic particle with low magnetic susceptibility, 522 ... Paramagnetic particle with high magnetic susceptibility, 523 ... Ferromagnetism Particles, A ... Substance discharged from the first separation tube, M ... Magnetic strength, H ... Magnetic force. P ... Mixed powder of ferromagnetic particles, paramagnetic particles, extremely magnetic particles, etc.

Claims (3)

[Claims] 1. A substance to be separated (14, 15, 1) is placed in a magnetic separation bore having a magnetic field gradient in a radial direction of the magnetic separation bore.
6) through a magnetic separation device that separates a specific substance due to the difference in the magnetic force acting on the particles of the substance to be separated in the magnetic field gradient in the magnetic separation bore, (A) The first magnetic field for separating ferromagnetic particles. A separating device (100) and (B) a second magnetic separating device (200) for separating paramagnetic and diamagnetic particles,
(C) The first magnetic separation device (100) has a first magnetic field generation device (18) having a small generated magnetic field and a first magnetic separation bore (17), and is supplied from the first supply unit (10). The ferromagnetic particles (16) are separated from the separated substance
The paramagnetic particles and the diamagnetic particles (14, 15) are collected in the collecting section (19) and the paramagnetic particles and diamagnetic particles (14, 15) are collected in the second collecting section and the second supplying section (2).
0), and (D) the second magnetic separation device (200).
Is a second magnetic field generator (22) that generates a large magnetic field
It has a magnetic separation bore (21) and separates only the paramagnetic particles (15) having a large magnetic susceptibility from the substances (14, 15) to be separated supplied from the second recovery section / second supply section (20). And a third magnetic recovery unit (23) for recovering paramagnetic particles and diamagnetic particles (14) having a low magnetic susceptibility, and a fourth magnetic recovery unit (24). 2. A magnetic field in the magnetic separation bore, wherein a substance to be separated is passed through the magnetic separation bore of a superconducting quadrupole magnet that generates a magnetic field having a zero magnetic field at the center and a magnetic field gradient in the radial direction of the magnetic separation bore. In an open gradient type magnetic separation device that separates a specific substance by utilizing the difference in magnetic force acting on the particles to be separated in the gradient, (A) a second recovery pipe () provided inside the magnetic separation bore (304) 307) and (B) second recovery pipe (30
7), the first recovery pipe (305) and (C) the mixed powder (P) of magnetic particles and non-magnetic particles (P) into the first recovery pipe (3).
05), a first supply pipe (309), and (D) first
A magnetic separation device comprising a second supply pipe (310) for supplying particles not separated by the recovery pipe (305) to the second recovery pipe (307). 3. A magnetic field in the magnetic separation bore, wherein a substance to be separated is passed through the magnetic separation bore of a superconducting quadrupole magnet that generates a magnetic field having a zero magnetic field at the center and a magnetic field gradient in the radial direction of the magnetic separation bore. In an open gradient type magnetic separation device that separates a specific substance by using the difference in magnetic force acting on the particles to be separated in the gradient, (A) magnetic separation bore (304) and (B) first supply pipe ( 309) and the second supply pipe (310),
(C) First recovery pipe (305) and second recovery pipe (30)
7), (D) first separation pipe (306) and second separation pipe (308), and (E) first separation substance recovery container (31).
1), a second separated substance recovery container (312) and a third separated substance recovery container (313). (F) The magnetic separation bore (304) is magnetically separated by a superconducting quadrupole magnet (301). The center of the bore has a zero magnetic field, and has a magnetic field that concentrically strengthens as it approaches the inner wall of the magnetic separation bore,
(G) A second recovery pipe (307) is provided inside the magnetic separation bore (304), (H) A first recovery pipe (305) is provided inside the second recovery pipe (307), and (I) A first supply pipe (309) for supplying the substance to be separated to the recovery pipe is provided above the first recovery pipe (305), and a second supply pipe (310) is provided above the second recovery pipe (307). ,
(J) A first separation pipe (306) is provided below the first recovery pipe (305), and a second separation pipe (308) is provided below the second recovery pipe (307). The first supply pipe (309) supplies the mixed powder (P) of magnetic particles and non-magnetic particles supplied from the outside to the first recovery pipe (305), and (L) the first separation pipe (306). Is a paramagnetic particle (321) having a small magnetic susceptibility and a paramagnetic particle (322) having a large magnetic susceptibility among the mixed powder (P) of magnetic particles and non-magnetic particles that have passed through the first recovery pipe (305). (M) The first separated substance recovery container (311) is connected to the first recovery pipe (3
Of the mixed powder (P) that has passed through 05), the first separation pipe (3
The ferromagnetic particles (323) that did not enter into (06) are collected, and (N) the substance (A) discharged from the first separation tube (306) is once placed on the magnetic separation device (300). After being lifted, it is supplied to the second recovery pipe (307) through the second supply pipe (310), and (O) the second separated substance recovery container (312) passes through the second recovery pipe (307). Paramagnetic particles (322) having a high magnetic susceptibility among (A) are recovered, and (P) the third separated substance recovery container (313).
Of the substance (A) that has passed through the second recovery pipe (307),
A magnetic separation device characterized by collecting paramagnetic particles (321) having a small magnetic susceptibility.