JPH0975630A - Magnetic separator and magnetic separation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase water purifying treatment quantity by eliminating the non-purifying time of a treated fluid by backwashing. SOLUTION: A plurality of high grade magnetic filters 20a, 20b are housed in one magnetic separation container 15 and a treated fluid introducing port 30 is provided between the high grade magnetic filters 20a, 20b and a means performing attraction operation by one high grade magnetic filter 20a and the regeneration operation of the other high grade magnetic filter 20a at the same time is provided. The high grade magnetic filters 20a, 20b are provided side by side so that the end surfaces of both filters are opposed to each other and the center axes of them are present almost on the same axis and one fluid adjusting mechanism such as a valve 38 changing over the flow of the treated fluid is provided and the magnets of the respective filters are formed of superconductive magnets.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter structure for purifying a processing fluid by magnetic separation, and particularly to a magnetic separation apparatus and method suitable for continuously performing magnetic separation by a high gradient magnetic filter (magnetic filter). Regarding

[0002]

2. Description of the Related Art In a conventional magnetic separation device, an electromagnet using a DC power supply is used as a magnetic field generator for externally applying a high gradient magnetic filter. This structure is from Chemical Engineering, Vol. 45, No. 4 (1981), p. 235, 2.
It is described on page 39. The high-gradient magnetic filter is surrounded by an iron yoke, which serves as a passage for magnetic lines of force to prevent leakage. A coil is arranged inside thereof, and a high-gradient magnetic filter is arranged in the central portion, and magnetic poles having a large number of holes are arranged vertically in the filter container with the high-gradient magnetic filter interposed therebetween.

The high-gradient magnetic filter is formed of magnetic fine wires and is filled with wire mesh-shaped magnetic stainless fine wires. By arranging the magnetic thin wire having such an extremely small radius of curvature in a uniform magnetic field, the magnetic field can be locally distributed near the surface of the magnetic thin wire to generate a large magnetic gradient.

To the raw water (treatment fluid) to be treated with water, as a pretreatment for the magnetic separation step, for example, magnetic powder such as iron tetraoxide or the like and aggregating agent such as bansulfate or polyaluminum chloride are added and stirred. As a result, the solid suspended matter in the raw water, algae, fungi and microorganisms are bound to the flocs by the flocculant to form a large number of colloidal magnetic flocs having magnetism. These magnetic flocs are adsorbed on the surface of the magnetic wire when passing through the high gradient magnetic filter and separated from the raw water.

The basic operation flow of the high gradient magnetic filter is shown in FIG. 4, and the operation operation will be described. The raw water in the reservoir 1 is temporarily pumped into the raw water storage tank 5 by the pump 4 through the filter 3 for removing dust larger than the water conduit 2. A magnetic powder of iron tetraoxide and a flocculant such as polyaluminum chloride are added to the raw water 6 from a chemical regulator 7 through a conduit 8 and a stirring machine 11 rotated by a motor 10 in a stirring tank 9 is stored. The pretreated water 12 containing magnetic flocs is produced by stirring with.
The pretreated water 12 passes through the valve 13 and the water conduit 14 to flow into the magnetic separation container (container) 15. DC power is supplied from the DC power supply 17 to the annular air-core coil 16. A magnetic field proportional to the direct current is generated in the horizontal cylindrical magnetic separation container 15, the magnetic field is made uniform by the porous magnetic poles 18 for water passage, and is surrounded by the iron yoke 19, and the yoke 19 serves as a passage for magnetic field lines. The leakage is prevented.

When the magnetic wire packing of the high gradient magnetic filter 20 is magnetized by the homogenized magnetic field, the magnetic field in the magnetic separation container 15 is disturbed due to the magnetized magnetic wire packing, and the magnetic field is locally disturbed. As a result, the magnetic flux is densely and densely generated, and a large number of parts having a high magnetic field gradient are generated. When pre-treated water 12 containing magnetic flocs is sent from below in an upward flow, the magnetic flocs in the raw water are captured by the magnetic fine wire surface of the packing with a large magnetic force, and the purified raw water is treated as treated water through the valve 21 and the guide. Water pipe 2
After passing through 2, the water is once stored in the treated water tank 23, and the water pipe 24
Returned to Reservoir 1.

After a certain amount of magnetic flocs are captured by the high gradient magnetic filter 20, the high gradient magnetic filter 20 is backwashed to restore the performance of magnetic separation. For backwashing, first, the valve 13 is closed to stop the water supply of the pretreated water 12.
Next, the DC power supply is turned off, the magnetic field is removed, and then the valve 21 is opened from the upper portion of the high gradient magnetic filter 20 to cause the treated water to flow backward by a predetermined amount and the valve 25 is opened. At this time, the air tank 2
Air is supplied from 6 through the valve 27 and the conduit 28 to wash and remove the magnetic flocs adhering to the surface of the magnetic fine wire while performing air bubbling, and store the wash water in the backwash treatment water tank 29. This cleaning water is separately carried out from the backwashing water tank 29 and is discarded or incinerated in a landfill or the like. After that, the valves 25 and 27 are closed, the direct current power is supplied from the direct current power supply 17 to the air-core coil 16 again, the valve 21 is opened, and the magnetic separation is restarted. No purification of raw water occurs during backwashing of the high gradient magnetic filter. The cycle of backwashing differs depending on the concentration of the magnetic separation / purified substance in the raw water, the injection amount of the drug, and the treatment rate of the raw water, and the faster the raw water is treated, the shorter the cycle becomes.

Conventionally, two or more magnetic filters for magnetic separation using a high gradient magnetic filter have been provided as a continuous water purification device for the sea, rivers or reservoirs to which this kind of solid-liquid separation technology is applied, and they are regenerated during operation. Japanese Patent Laid-Open No. 59-371 discloses that it is sufficient to switch the time.
The specific structure and operation are not described. However, in recent years, as the purification treatment amount of the water treatment device has increased, it has become necessary to improve the performance of the magnetic separation unit. One method for improving the magnetic separation efficiency is to increase the magnetic field strength and the magnetic floc trapping force. In addition, the regeneration time (non-purified time) by backwashing is required, and the backwashing cycle becomes shorter as the amount of treatment increases, and the raw water is not purified during backwashing, so multiple high gradient magnetic filters are used. However, it is desired to realize an apparatus having an increased purification treatment amount.

[0009]

In the conventional magnetic separation apparatus, the performance of the magnetic separation unit has to be improved with the increase in the purification capacity of the water treatment apparatus in recent years. It is to increase the magnetic floc's capturing power. Further, as the treatment amount increases, the backwash cycle becomes shorter, and the raw water is not purified during the backwash, so that there is a problem that the purification treatment amount cannot be increased with one magnetic filter.

An object of the present invention is to provide a magnetic separation apparatus and method capable of increasing the amount of purification treatment by eliminating the unpurified time of the treatment fluid by backwashing.

[0011]

To achieve the above object, a magnetic separation device according to the present invention comprises a magnet for generating a magnetic field and a magnetic filter arranged in the magnetic field and filled with a magnetic material. In a magnetic separation device for adsorbing and removing a magnetic substance in a processing fluid with a filter, a magnet is formed by a superconducting magnet and a refrigerating means for holding the superconducting magnet at a superconducting generation temperature is provided.

Further, at least one magnet for generating a magnetic field and at least one magnetic filter arranged in the magnetic field and filled with a magnetic substance are provided, and each magnetic filter adsorbs and removes a magnetic substance in a processing fluid. In the apparatus, while accommodating a plurality of magnetic filters in one container, an inlet for the processing fluid is provided between each magnetic filter, and the adsorption operation by one magnetic filter and the regeneration operation by the other magnetic filter are performed. It may be configured to include a means for performing at the same time.

In each magnetic filter, the end faces of the one cylindrical magnetic filter and the other cylindrical magnetic filter are opposed to each other, and the respective central axes of the cylindrical filters are substantially on the same axis. The magnets may be arranged side by side so that magnets are provided around the side surfaces of the respective magnetic filters.

Further, at least one magnet may be formed of a superconducting magnet and may be provided with a refrigerating means for maintaining the superconducting generation temperature.

Each magnetic filter may be provided with one fluid adjusting mechanism for switching the flow of the processing fluid.

Further, each magnet is formed of a superconducting magnet, and is provided with a refrigerating means for holding one of the superconducting magnets at a superconducting generation temperature and a mechanism for transferring cold heat to the other superconducting magnet. You may have a structure.

Further, in the respective magnetic filters, the end faces of the one cylindrical magnetic filter and the other cylindrical magnetic filter are opposed to each other, and the central axes of the cylindrical filters are substantially on the same axis. As described above, one magnet may be provided so as to be movable along the side surface of each magnetic filter.

In the magnetic separation method, at least one magnet for generating a magnetic field and at least one magnetic filter arranged in the magnetic field and filled with a magnetic material are provided.
In a magnetic separation method in which magnetic substances in the processing fluid are adsorbed and removed by each magnetic filter, the processing fluid is switched to a plurality of magnetic filters housed in one container by one fluid adjustment mechanism, and adsorption by one magnetic filter is performed. During operation, the other magnetic filter is regenerated at the same time.

In addition, the fluid purification system is configured to include any one of the above magnetic separation devices.

[0020]

According to the present invention, two high gradient magnetic filters are provided, and while one high gradient magnetic filter is backwashed, the other high gradient magnetic filter purifies the pretreated water. Since the fluid adjustment mechanism of the filter is shared,
The processing fluid is continuously purified. In addition, two high gradient magnetic filters each having a porous magnetic pole are arranged coaxially and in parallel in the same container so that pretreatment water is supplied from the central portion thereof, and magnetic separation is performed at the central portion. By arranging the fluid adjustment mechanism, a small-sized and space-saving device can be provided. Also, since each high-gradient magnetic filter has magnetic poles, when one of the air-core coils (magnets) is excited or demagnetized, there is little induction current due to the leakage magnetic field of the other air-core coil, and excitation or demagnetization can be performed in a short time. , The backwash time becomes shorter.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, at least one magnet (air-core coil) that generates a magnetic field and at least one magnetic filter (high gradient magnetic filter) that is arranged in the magnetic field and filled with a magnetic material are provided, and each magnetic filter Is a magnetic separation device that adsorbs and removes magnetic substances in the treatment fluid (raw water) 6, and stores a plurality of high-gradient magnetic filters 20a, 20b in a single container (magnetic separation container) 15.
An inlet 30 for the processing fluid is provided between the high gradient magnetic filters 20a and 20b, and a means for performing adsorption operation by one of the high gradient magnetic filters 20a and regeneration operation of the other high gradient magnetic filter 20b at the same time is provided. The high gradient magnetic filters 20a and 20b are provided with the respective configurations.
The end faces of one cylindrical high-gradient magnetic filter 20a and the other high-gradient magnetic filter 20b are opposed to each other, and they are arranged side by side such that their cylindrical central axes are substantially on the same axis. Each high gradient magnetic filter 2
Multiple air core coils (0a, 20b) (superconducting air core coil)
It is assumed that 16a and 16b are circumferentially provided, and one fluid adjusting mechanism (means for performing at the same time) such as a valve 38 for adjusting the flow of the processing fluid is attached, and each magnet is formed of a superconducting magnet.

That is, the raw water 6 in the reservoir 1 is pumped through the filter 3 for removing larger dust than the water conduit 2.
Is temporarily stored in the raw water storage tank 5, and the raw water 6 is added with a magnetic powder of iron tetraoxide and a flocculant such as polyaluminium chloride through a conduit 8 from a chemical regulator 7 and is rotated by a motor 10 in a stirring tank 9. Stir with a stirrer 11 to produce pretreated water 12 containing magnetic flocs. The pretreated water 12 passes through the water conduit 14 and is introduced into the magnetic separation container 15 through the water inlet 30.
For example, the fluid purification system is configured so as to flow into the magnetic separation portion including the high gradient magnetic filter 20a and the air-core coil 16a on the right side of the drawing through the circulation hole 31a.

A DC current is supplied from the DC power supply 17 to the superconducting air-core coil 16a through the electric wire 17a, and a magnetic field proportional to the DC current of 5,000 Gauss is 50,000.
A magnetic field of 0 Gauss is generated in the horizontal cylindrical magnetic separation container 15, and the magnetic field is a horizontal cylindrical high gradient magnetic filter 20a.
It is made uniform by the disk-shaped porous magnetic poles 18a for water passage provided on both end faces of the. The superconducting air-core coil 16a is surrounded by a yoke 19a made of iron, and the yoke 19a acts as a passage of magnetic force lines to prevent magnetic field leakage to the outside of the yoke 19a.
The uniform magnetic field magnetizes the magnetic wire filler of the high gradient magnetic filter 20a. Magnetic separation container 15
The magnetic field in the installation space of the high-gradient magnetic filter 20a inside is disturbed due to the magnetized magnetic wire filling, and the magnetic flux is locally concentrated and dense, and a large number of portions having a high magnetic field gradient are generated.

When the pretreated water 12 containing the magnetic flocs is fed to the magnetic separation part composed of the high gradient magnetic filter 20a and the superconducting air-core coil 16a in the right direction of the drawing, the magnetic flocs in the raw water 6 (magnetized dust-like (Precipitate) is captured by the magnetic fine wire surface of the packing with a large magnetic force, so that the raw water 6 is purified. The purified raw water passes through the separator outlet 37a and the water conduit 22 and is once stored in the treated water tank 23 as treated water, and is returned to the reservoir 1 through the water conduit 24.
At this time, the valve 21a, the valve 25a and the valve 27a are closed.

Here, the freezing means will be described. The superconducting air-core coil 16a is installed in the adiabatic vacuum container 32a, and is cooled to below the superconducting generation temperature by the refrigerator 33a using a working fluid such as helium. The refrigerator 33a is supplied with high-pressure helium gas or the like from the compressor 34 through the pipe 35a, and is adiabatically expanded in the refrigerator to be cold (refrigerant having a superconducting generation temperature or lower).
Occurs. The superconducting air-core coil 16a is directly or indirectly cooled by this cold. The low-pressure helium gas, etc., which has expanded in the refrigerator, is passed through the pipe 36a to the compressor 3
It returns to 4 and is compressed again.

In order to restore the performance of magnetic separation after a certain amount of magnetic flocs have been captured by the high gradient magnetic filter,
Backwashing is performed to wash the high gradient magnetic filter. The magnetic separator on the left side of the drawing shows the backwash process. First, the backwash is performed by a valve 38 made of a non-magnetic material such as an aluminum alloy.
The valve rod 39 is moved to the left by the valve rod moving device 40 to switch the valve rod 39, and the communication hole 31b is closed via the O-ring 42. The fluid adjusting mechanism is formed by the valve 38, the valve rod 39, the valve rod moving device 40, and the like. The water supply of the pretreated water 12 is stopped by the valve 38 by this operation. At this time, the DC current distributed from the DC power supply device 17 through the electric wire 17b is stopped to eliminate the magnetic field. High gradient magnetic filter 20b
The magnetic flocs trapped on the surface of the magnetic filter 20b are easily separated from the surface of the magnetic fine wire forming the magnetic filter 20b.

The high-gradient magnetic filter 20b on the left side of the drawing is backwashed while the processing fluid is being purified by the separation unit including the high-gradient magnetic filter 20a on the right side of the drawing, and the separation on the upper left side of the high-gradient magnetic filter 20b in the drawing is performed. A predetermined amount of the treated water in the treated water tank 23 is caused to flow backward from the device outlet 37b through the pipe 41 and the valve 21b, and the captured magnetic flocs are washed liquid outlet 43.
It is carried out from b, and the washing water is stored in the backwashing treatment water tank 29 through the valve 25b and the pipe 25. During this cleaning, air is supplied from the air tank 26 through the valve 27b and the conduit 28b from the lower part of the magnetic separation portion to perform air bubbling, thereby cleaning and removing the magnetic flocs better.

This wash water is separately carried out from the backwash water tank 29, and is discarded in a landfill or incinerated. After backwashing, the valves 25b and 27b are closed, the purified water is filled in the magnetic separation portion through the valve 21b, and then the valve 21b is closed.

After backwashing, a DC current is again applied to the superconducting air-core coil 16b from the DC power supply 17 through the electric wire 17b, and a magnetic field proportional to the DC current, for example, a magnetic field of 5,000 gauss to 50,000 gauss is formed in a horizontal cylindrical shape. The magnetic field generated in the magnetic separation container 15b is made uniform by the water-permeable disk-shaped porous magnetic poles 18b provided on both end surfaces of the horizontal cylindrical high-gradient magnetic filter 20b. The superconducting air-core coil 16b is surrounded by an iron yoke 19b.
The b acts as a passage for lines of magnetic force to prevent leakage of the magnetic field to the outside of the yoke 19b.

The superconducting air-core coil 16b is an adiabatic vacuum container 3
It is installed in 2b and cooled to below the superconducting generation temperature by a refrigerator 33b using a working fluid such as helium. The refrigerator 33b is supplied with high-pressure helium gas or the like from the compressor 34 through the pipe 35b, and adiabatically expands in the refrigerator to generate cold. The superconducting air-core coil 16b is directly or indirectly cooled by this cold. The low-pressure helium gas or the like that has expanded in the refrigerator returns to the compressor 34 through the pipe 36b and is compressed again.

Next, the magnetic separation unit on the right side of the drawing is to be backwashed during the cleaning operation in the magnetic separation unit on the left side of the drawing. After a certain amount of magnetic flocs are captured by the magnetic filter 20a, the valve is washed back. 38 and the valve rod 39 are moved to the right by the valve rod moving device 40, and the flow hole 31a is moved to the O-ring 42.
Close through. The water supply to the magnetic separation unit on the right side of the drawing in the drawing is stopped by this operation, and the pretreatment water 12 is continuously supplied to the magnetic separation unit on the left side that has already been backwashed and washed, and the purification operation continues. To be done. After the flow hole 31a is closed, the DC current distributed from the DC power supply device 17 through the electric wire 17a is stopped to eliminate the magnetic field. As a result, the magnetic flocs captured by the high gradient magnetic filter 20a are easily separated from the surface of the thin wire forming the magnetic filter 20a.

From the separator outlet 37a in the upper right part of the high gradient magnetic filter 20a, a predetermined amount of the treated water in the treated water tank 23 is made to flow back through the pipe 41 and the valve 21a, and the captured magnetic flocs are carried out from the cleaning liquid outlet 43a. The wash water is stored in the backwash treated water tank 29 through the valve 25a and the pipe 25. During this cleaning, air is supplied from the air tank 26 through the valve 27a and the conduit 28a from the lower part of the magnetic separation section to perform air bubbling, thereby cleaning and removing the magnetic flocs better.

After the cleaning is completed, the valves 25a and 27a are closed and the cleaned magnetic separation unit is filled with water in the treated water tank, and the valve 21a is closed.
Is closed, power is supplied to the superconducting air-core coil 16a again, and the process waits until the next switching. As described above, according to this embodiment, the pretreated water is continuously purified by the other magnetic separation unit even when the one magnetic separation unit is backwashed, so that the purification rate can be significantly increased. This is because the superconducting air-core coil is used, and the magnetic field strength of the magnetic separation unit is made significantly larger than that when using a normal conducting magnet or a permanent magnet, to enhance the trapping force of the magnetic flocs, and the water flow rate of the treated water. The effect that the backwash cycle is shortened by increasing the value is large, and the pretreated water can be continuously magnetically separated so that the backwash cycle is shortened.
Furthermore, by sharing the fluid adjustment mechanism of the magnetic separation unit, the raw water can be continuously purified. Further, two magnetic separation parts each having a porous magnetic pole are arranged coaxially in parallel in the same container so that pretreatment water is supplied from the central part thereof, and further to the magnetic separation part at the central part. By arranging the fluid adjusting mechanism of (1), a small-sized and space-saving magnetic separating unit can be configured.

Further, since each of the magnetic separation portions has a magnetic pole, when the air-core coil of one magnetic separation portion is excited or demagnetized, the induction current due to the leakage magnetic field of the other air-core coil is small, and the excitation or demagnetization is performed in a short time. Degaussing can be performed and backwash time can be shortened.

Further, by constructing the two air-core coils by superconducting magnets, the size and weight can be greatly reduced as compared with the case where they are constituted by normal conducting magnets or permanent magnets, and the power consumption is much higher than that of the normal conducting magnets. Since it can be reduced, there is an advantage that it can be installed on a ship or vehicle where it is difficult to secure electric power, or in an underground facility where waste heat is difficult.

FIG. 2 shows another embodiment of the present invention. The present embodiment is different from the embodiment shown in FIG. 1 in that only one superconducting air-core coil 16a is movably provided as an air-core coil, the superconducting air-core coil 16a is demagnetized during backwashing, and then the washed high-gradient coil is used. The superconducting air-core coil is moved to the magnetic filter side so as to be excited. further,
The water guide port 30 and the cleaning liquid outlets 43a and 43b may be formed at positions that do not hinder the movement of the superconducting air-core coil 16a. In addition, each high gradient magnetic filter 20a,
Porous magnetic poles 18a and 18b are arranged on both end faces of 20b, respectively, and the pipes 35a and 36a are formed of flexible pipes.

According to the present embodiment, since it is possible to continuously purify with only one superconducting air-core coil, it is possible to reduce the cost of the apparatus and to downsize the apparatus.

Another embodiment of the present invention is shown in FIG. This embodiment is different from the embodiment shown in FIG. 1 in that superconducting air-core coils 16a and 16b are wound around the same bobbin (winding table) 38, and a single cooling unit 33a conducts a conductive cooling body (cooling heat is transferred). Mechanism 39) for cooling, and the adiabatic vacuum container 32 is commonly used.

According to this embodiment, since the heat insulating vacuum container 32 can be shared, the two superconducting air-core coils 16a and 16b.
Since it can be cooled by a single refrigerator, the device cost can be reduced and the device can be downsized.

Further, an AC superconducting conductor is used as the superconducting conductor of the superconducting air-core coil, for example, the filament wire diameter forming the conductor is small and the pitch is small, and CuNi is used as the base material between the filaments to excite the coil. Alternatively, the electrical loss at the time of demagnetization is small, the heat generation of the superconducting air core coil is small, and the stability of the superconducting state is enhanced.

As another embodiment of the present invention, the magnetic separation method includes at least one magnet for generating a magnetic field, and at least one magnetic filter arranged in the magnetic field and filled with a magnetic material. Is a magnetic separation method for adsorbing and removing the magnetic substance in the processing fluid by switching the processing fluid to each magnetic filter housed in one container with one fluid adjustment mechanism, and adsorbing with one magnetic filter. A configuration comprising a step of performing a regeneration operation of the other magnetic filter at the same time during operation, and the fluid purification system is a configuration including any one of the above magnetic separation devices, and any configuration is the same as above. The effect can be obtained.

The raw water described above is water containing impurities such as rivers, dams, lakes, seawater, reservoirs, industrial wastewater, sewage and rainwater, and impurities are substances such as organic substances, inorganic substances and microorganisms. , Metal objects, non-metal objects, soil, radioactive materials and metal ions. In particular, divalent iron ions such as ferrous sulfate and alkali are added to raw water containing heavy metal ions to coprecipitate heavy metal ions with precipitation of ferrous hydroxide and then oxidize with air to precipitate. To ferrite.
This ferritization allows the heavy metal to be magnetically separated.
In this case, if the purpose is to separate only the heavy metal ions, the aggregating agent becomes unnecessary. Therefore, ferrous sulfate, an alkaline solution, and air are injected into the raw water as a pretreatment and treated in a stirring tank, and then the pretreated water may be introduced to the magnetic separation unit.

[0043]

According to the present invention, since a plurality of magnetic filters are accommodated in one container and the treatment fluid is switched, the treatment fluid is continuously purified by the other magnetic filter while backwashing with one of the magnetic filters. Moreover, since the magnetic field is generated by the superconducting magnet, the purification speed can be increased, and the device can be made small and lightweight.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a basic flow of a driving operation according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a basic operation flow of another embodiment of the present invention.

FIG. 3 is a configuration diagram showing a basic operation flow of another embodiment of the present invention.

FIG. 4 is a diagram illustrating a basic flow of a driving operation according to a conventional technique.

[Explanation of symbols]

 15 magnetic separation container 20a, 20b high gradient magnetic filter 30 water inlet 16a, 16b superconducting air core coil 38 valve 40 valve rod moving device 33a, 33b refrigerator

Claims (9)

[Claims] 1. A magnetic separation device comprising a magnet for generating a magnetic field and a magnetic filter arranged in the magnetic field and filled with a magnetic material, wherein the magnetic filter adsorbs and removes a magnetic substance in a processing fluid. And a refrigerating means for holding the superconducting magnet at a superconducting generation temperature. 2. At least one magnet for generating a magnetic field and at least one magnetic filter arranged in the magnetic field and filled with a magnetic material are provided, and the magnetic substance in the processing fluid is adsorbed and removed by each magnetic filter. In the magnetic separation device, while accommodating a plurality of magnetic filters in one container, the inlet of the processing fluid is provided between the respective magnetic filters, adsorption operation by one magnetic filter,
A magnetic separation device comprising means for simultaneously performing a regenerating operation of the other magnetic filter. 3. In each magnetic filter, the end faces of one cylindrical magnetic filter and the other cylindrical magnetic filter are opposed to each other, and the central axes of the cylindrical filters are substantially the same axis. The magnetic separation device according to claim 2, wherein the magnets are arranged side by side so as to be on the upper side, and a magnet is provided around the side surface of each magnetic filter. 4. The magnetic separation device according to claim 2, wherein at least one magnet is formed of a superconducting magnet and is provided with a refrigerating unit for maintaining the superconducting generation temperature. 5. The magnetic separation device according to claim 2, wherein each magnetic filter is provided with one fluid adjusting mechanism for switching the flow of the processing fluid. 6. Each of the magnets is formed of a superconducting magnet, and is provided with a refrigerating unit for holding one of the superconducting magnets at a superconducting generation temperature and a mechanism for transferring cold heat to the other superconducting magnet. The magnetic separation device according to claim 2, 3 or 5, wherein: 7. In each magnetic filter, the end faces of one cylindrical magnetic filter and the other cylindrical magnetic filter are opposed to each other, and the central axes of the cylindrical filters are substantially on the same axis. 6. The magnetic separation apparatus according to claim 2, wherein the magnets are arranged side by side so that one magnet is provided so as to be movable on the side surface of each magnetic filter. 8. At least one magnet for generating a magnetic field and at least one magnetic filter arranged in the magnetic field and filled with a magnetic substance are provided, and each magnetic filter adsorbs and removes a magnetic substance in a processing fluid. In the magnetic separation method, the processing fluid is switched to a plurality of magnetic filters contained in one container by one fluid adjusting mechanism, and the regeneration operation of the other magnetic filter is simultaneously performed during the adsorption operation by one magnetic filter. Characteristic magnetic separation method. 9. A fluid purification system comprising the magnetic separation device according to any one of claims 1 to 7.