JP6793464B2 - Magnetic material recovery device - Google Patents

Description

The present invention relates to a magnetic material recovery device.

Conventionally, as a method for purifying soil or the like contaminated with heavy metals or the like, for example, a method of slurrying soil and mixing iron powder is known. Here, it is desirable to collect and reuse the mixed iron powder from the viewpoint of consideration for the environment and cost reduction.

As a technique for recovering iron powder mixed in a slurry, for example, a magnetic material recovery device disclosed in Patent Document 1 is known. In this device, iron powder mixed in the slurry is attached to a rotary belt magnetized by a magnetic field generated by a magnetic field generating means, and after removing excess mixture other than iron powder adhering to the belt by a fluid injection means. , The iron powder is collected from the belt by the collecting means.

Japanese Unexamined Patent Publication No. 2010-36113

However, in this magnetic material recovery device, the slurry flowing in from the inflow port contacts the belt with the inflowing momentum depending on the flow rate (for example, 1 m ³ / min or more), so that a part of the iron powder adhering to the belt is removed. It comes off the belt and the recovery rate of iron powder decreases. Further, in this magnetic material recovery device, the portion of the belt to which iron powder is attached is pulled in the direction opposite to the traveling direction of the belt by the magnetic field generating means, so that a large load is applied to the motor and the power consumption is increased. If the direction of rotation of the belt is reversed to avoid this, the iron powder will easily fall off the belt because it will pass through the part where the magnetic field is weakest before the recovery means operates against the part where the iron powder is attached. The recovery rate of iron powder decreases.

Therefore, an object of the present invention is to provide a magnetic material recovery device capable of improving the recovery rate while suppressing power consumption.

The present invention is a magnetic material recovery device that recovers a magnetic material from a mixture containing a magnetic material, and is affected by an inflow port into which the mixture flows, a magnetic field generating means for generating a magnetic field, and a magnetic field generated by the magnetic field generating means. A rotary belt provided below that adheres a magnetic material by being magnetized by a magnetic field, a fluid injection means that injects fluid onto the belt and removes a mixture other than the magnetic material adhering to the belt, and a fluid. A recovery means for recovering by sucking the magnetic material from the belt from which a mixture other than the magnetic material has been removed by the injection means is provided, and the belt and the magnetic field generating means are provided from below on the side where the belt is close to the magnetic field generating means. The fluid injection means and the recovery means are arranged so that the influence of the magnetic field on the belt is weakened so as to have an ascending portion that goes upward and the belt is arranged so that the influence of the magnetic field becomes weaker from the lower side to the upper side. Provided is a magnetic material recovery device provided at a position where the magnetic material recovers the magnetic material, which is provided at a position where the magnetic material recovers the magnetic material, and has a buffering means for buffering the flow of a mixture flowing from the inflow port between the inflow port and the belt.

In this magnetic material recovery device, the ascending part of the belt is on the side closer to the magnetic field generating means, and the influence of the magnetic field becomes weaker as the belt moves from the lower side to the upper side, so that the magnetic material adheres. There is a region where the portion is pulled in the traveling direction by the magnetic field generating means. Therefore, it is possible to cancel the pulling force in the direction opposite to the traveling direction, which also exists in the conventional magnetic material recovery device, and thereby the increase in power consumption can be suppressed. Further, since this magnetic material recovery device is provided with a buffering means for buffering the flow of the mixture flowing in from the inflow port between the inflow port and the belt, the mixture comes into contact with the belt with the momentum at the time of inflow. There is no. Therefore, a part of the iron powder adhering to the belt is prevented from coming off the belt due to the contact of the mixture, so that the recovery rate of the magnetic material is improved.

The cushioning means is preferably a space extending in the direction away from the belt. According to this, the flow velocity at the time of inflow decreases while the inflowing mixture diffuses into the space. Then, since the mixture comes into contact with the belt in a state where the flow velocity is sufficiently lowered, the magnetic material adhering to the belt is prevented from coming off due to the contact of the mixture.

The recovery means is preferably provided so as to incline in a direction away from the magnetic field generating means. Since the magnetic material passing through the inside of the collecting means is pulled by the magnetic field generating means, if the collecting means is provided so as to incline in a direction away from the magnetic field generating means, the passage of the magnetic material is less likely to be hindered.

Further, the magnetic material recovery device preferably includes a pressing roller that comes into contact with the ascending portion between the ascending portion and the magnetic field generating means. Depending on the strength of the magnetic field generated by the magnetic field generating means, it is considered that the belt to which the magnetic material is attached is strongly pulled toward the magnetic field generating means, which hinders the rotation of the belt. Here, if a holding roller that contacts the ascending portion is provided between the ascending portion and the magnetic field generating means, the belt is not excessively pulled toward the magnetic field generating means, and the belt is smooth even when the magnetic field is strong. Can rotate to.

Further, the magnetic material recovery device may include a plurality of main body portions including an inflow port, a belt, a fluid injection means, a recovery means, and a buffering means for one magnetic field generating means. In this case, the amount of the mixture processed for one magnetic field generating means is doubled by the number of combined configurations.

According to the present invention, it is possible to provide a magnetic material recovery device capable of improving the recovery rate while suppressing power consumption.

It is a figure which shows the outline of the injection stirring system including the magnetic material recovery device. It is a figure which shows a part of the injection agitation system schematically. It is a side sectional view which shows schematic structure of the magnetic material recovery apparatus. FIG. 3 is a sectional view taken along line IV-IV in FIG. It is a figure which shows the other structure of a buffering means. It is a figure which shows the other form of the magnetic material recovery apparatus. It is a figure which shows the other form of the injection agitation system.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same parts or corresponding parts are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a diagram showing an outline of an injection stirring system including a magnetic material recovery device. FIG. 2 is a diagram schematically showing an injection stirring system including a discharge slurry storage tank 5 and a magnetic material recovery device 6. As shown in FIGS. 1 and 2, the jet stirring system 1 injects a purifying material while cutting the ground in the contaminated ground, and mixes the contaminated ground and the purifying material in the in-situ position to contaminate the contaminated part (groundwater, soil). ) Is to be used to implement the soil purification (ENVIRO JET) method for detoxifying the soil. The injection stirring system 1 includes a purification material storage tank 2, an injection pipe 3, a guide pipe 4, a discharge slurry storage tank 5, a magnetic material recovery device 6, and a VOC removal tank 7. The guide pipe 4, the discharge slurry storage tank 5, and the discharge slurry storage tank 5 and the magnetic material recovery device 6 are connected by a transfer line L, respectively.

The purifying material storage tank 2 is a tank that sends the purifying material to the injection pipe 3. The purifying material is a mixture of iron powder (magnetic material), thickener (polysaccharide), and tap water. The iron powder has an ionic valence of 0 and a diameter of about 0.07 to 0.1 mm (maximum 0.5 mm), and acts as a reducing agent (reduced iron powder) for purifying contaminated groundwater. In addition, iron powder also exhibits an action of adsorbing heavy metals and the like contained in soil.

The injection pipe 3 has a double pipe structure for delivering a purifying material and compressed air, respectively. The injection pipe 3 injects a purifying material and compressed air from a nozzle (not shown) provided at the tip thereof, respectively, to form an iron powder mixture in which the soil of the original ground and iron powder are mixed in the ground. The injection pipe 3 cuts the contaminated soil with the purifying material and compressed air, and mixes the purifying material. As a result, the cut soil and the purifying material are agitated and mixed in the contaminated ground.

The guide pipe 4 is inserted into a hole cut toward the groundwater flow W in the contaminated ground, and the injection pipe 3 is passed through the inside of the pipe. Further, the guide pipe 4 discharges the surplus slurry in the ground due to the cutting of the soil by the injection pipe 3 and the injection of the purifying material from the ground to the ground side. The slurry (mixture) contains cut soil, a part of a purifying material containing iron powder, muddy water, air and the like.

The discharge slurry storage tank 5 temporarily stores the slurry discharged from the guide pipe 4. Slurry of about 0.3 to ³ m3 per minute is discharged from the guide pipe 4 to the discharge slurry storage tank 5 via the transfer line L.

The magnetic material recovery device 6 recovers iron powder from the slurry. The magnetic material recovery device 6 is adjusted to a valve V1 (see FIG. 2) provided on the transfer line L connecting the magnetic material recovery device 6 and the discharge slurry storage tank 5 to be 0.3 per minute. A slurry of about ³ m ³ is conveyed from the discharge slurry storage tank 5. The magnetic material recovery device 6 recovers 99% or more of the iron powder contained in the slurry. This has been clarified by tests and experiments by the inventors.

A gas-liquid separator 8 is connected to the magnetic material recovery device 6. The gas-liquid separator 8 is a device that separates the air sucked together with the iron powder recovered by the magnetic material recovery device 6 according to the suction by the blower (recovery means) 8A, and recovers the iron powder. The iron powder recovered by the gas-liquid separator 8 is then reused as a purifying material.

A VOC (Volatile Organic Compound) removing tank 7 and a VOC removing device 7A connected by a transport line L are provided after the magnetic material recovery device 6. The VOC removal tank 7 and the VOC removal device 7A adsorb and remove exhaust gas such as VOC contained in the slurry with activated carbon, and release the air after the removal treatment into the atmosphere.

Subsequently, the configuration of the magnetic material recovery device 6 will be described in detail with reference to FIGS. 3 and 4. FIG. 3 is a side sectional view schematically showing the configuration of the magnetic material recovery device 6. FIG. 4 is a sectional view taken along line IV-IV in FIG. In FIG. 4, the belt 16 is not shown for convenience of explanation.

As shown in FIGS. 3 and 4, the magnetic material recovery device 6 includes a magnetic field generating portion (magnetic field generating means) 9 and a main body portion 10. The magnetic field generating portion 9 and the main body portion 10 are fixed on the base by a fixing member.

The magnetic field generating unit 9 is a portion that generates a magnetic field (magnetic field). The magnetic field generating portion 9 is arranged in contact with the main body portion 10, and is configured to have a superconducting electromagnet. The magnetic field generated from the magnetic field generation unit 9 is set to be strong on the lower side of the main body portion 10 and weaker toward the upper side. The strength of the magnetic field can be appropriately changed by a control device (not shown).

The main body 10 is composed of a housing 11 and a motor 12. The housing 11 includes an inflow port 13, an outflow port 14, a discharge port 15, a belt 16, water jets (fluid injection means) 17a and 17b, and an iron powder suction port (collection means) 18.

The inflow port 13 is provided in the housing 11 so that the inflow direction of the slurry is downward. The inflow port 13 is connected to the transport line L to allow the slurry to flow into the housing 11.

The outflow port 14 is provided on the opposite side of the inflow port 13, and discharges muddy water or the like overflowing from the housing 11. The outflow port 14 is provided above the inflow port 13. As a result, inside the housing 11, water does not infiltrate above the outlet 14.

The discharge port 15 is provided below the belt 16 (the bottom of the housing 11), and discharges soil particles and the like contained in the slurry so as not to be deposited in the housing 11. A valve V2 (see FIG. 2) is provided at the discharge port 15, and the discharge amount can be adjusted by the valve V2. The discharge amount of the discharge port 15 is set to be smaller than the discharge amount of the outlet 14.

Further, the housing 11 not only extends in the extending direction (vertical direction) of the belt 16 in its outer shape, but also bulges in the direction away from the magnetic field generating portion 9 and the belt 16, and inside the housing body 11, the inflow port 13 and An extending space (buffering means) 25 extending from the belt 16 is formed. The inflow port 13 is provided so that the inflow of the slurry is downward in the vertical direction on the side of the extending space 25 farthest from the belt 16.

The inner wall of the portion of the inner wall of the housing 11 forming the extending space 25 is separated from the belt 16 at a predetermined distance. Of the inner walls forming the extending space 25, the distance between the inner wall S farthest from the belt 16 and the belt 16 is preferably 25 to 60 cm, more preferably 30 to 50 cm. Further, it is preferable that the distance between the inflow port 13 and the belt 16 is the same value.

The belt 16 is formed in a mesh shape by a magnetic wire having a diameter of about 2 mm, which is magnetized by a magnetic field generated from the magnetic field generating portion 9. The distance between the meshes is about 6 mm. With such a configuration, the belt 16 allows soil particles to pass through when it comes into contact with the slurry flowing in from the inflow port 13, and has a strength capable of withstanding the water pressure of the slurry. The shape may be any shape having holes (clearances) in the belt 16, and is not limited to the mesh.

Further, the belt 16 is hung between a roller-shaped drive rotating body 19 provided on the upper part of the housing 11 and a roller-shaped driven rotating body 20 provided on the lower part of the housing 11. The driving rotating body 19 and the driven rotating body 20 extend horizontally on the same straight line along the vertical direction and are arranged and fixed. The drive rotating body 19 is connected to the motor 12 and rotates according to the rotation of the motor 12. The direction of rotation is counterclockwise in FIG. The driven rotating body 20 is rotatably provided. The belt 16 rotates with the rotation of the drive rotating body 19.

As the belt 16 rotates counterclockwise in FIG. 3, the belt 16 has an ascending portion 160 extending from the lower side to the upper side on the side closer to the magnetic field generating portion 9. In the ascending portion 160, the influence of the magnetic field becomes weaker as the belt 16 moves from the lower side to the upper side.

Further, the belt 16 is in contact with a roller-shaped rotating body (holding roller) 21 arranged and fixed at a height position between the driving rotating body 19 and the driven rotating body 20 in the ascending portion 160. The rotating body 21 is provided between the ascending portion 160 and the magnetic field generating portion 9, whereby the ascending portion 160 is curved so as to be away from the magnetic field generating portion 9 and is below the rotating body 21. It is divided into a first half portion 160a and a second half portion 160b above the rotating body 21.

Water jets 17a and 17b are provided in the process of weakening the influence of the magnetic field in the ascending portion 160, and iron powder suction ports 18 are provided following the water jets 17a and 17b.

The water jets 17a and 17b inject water (fluid) into the belt 16. Water is supplied to the water jets 17a and 17b from the pump 22 (see FIG. 2), and the pressure of the water injected from the water jets 17a and 17b is about 0.3 Mpa. The water jets 17a and 17b are arranged so as to sandwich the belt 16 so that water is sprayed on the surface close to the outlet 14 and the back surface thereof at the portion directly above the arrangement position of the outlet 14 of the belt 16. There is. As shown in FIG. 4, the water jets 17a and 17b have a plurality of nozzles 23 and 24 arranged at regular intervals along the horizontal direction, and the injection positions P of the belt 16 from the nozzles 23 and 24 Water is sprayed toward. The water jets 17a and 17b may inject water at different injection positions, such as the water jet 17a injecting water at the injection position P and the water jet 17b injecting water above the injection position P.

The iron powder suction port 18 is provided on the magnetic field generating portion 9 side with respect to the housing 11 and above the magnetic field generating portion 9, and collects iron powder by sucking iron powder from the belt 16. The iron powder suction port 18 is arranged so as to incline in a direction away from the magnetic field generating portion 9, and here, the angle is 45 degrees with respect to the horizontal direction. The iron powder suction port 18 is provided with a contact piece 18a that comes into contact with the belt 16 along the upper portion of the suction port. The iron powder suction port 18 sucks and collects iron powder while peeling it from the belt 16 by the contact piece 18a. The suction force of the iron powder suction port 18 is about 20 kpa.

Subsequently, the operation of the magnetic material recovery device 6 (magnetic material recovery method) will be described with reference to FIG. The magnetic material recovery device 6 is operated by a control device (not shown) such as turning on / off the power supply.

First, when the power of the magnetic material recovery device 6 is turned on, the magnetic field generation unit 9 generates a magnetic field, the motor 12 rotates the belt 16, the water jets 17a and 17b inject water, and the iron powder suction port 18 sucks. Is started. At this time, the magnetic field generated by the magnetic field generating unit 9 affects the inside of the housing 11 and magnetizes each configuration. For example, 2100G (Gauss) in the vicinity of the slurry flowing in from the inflow port 13 coming into contact with the belt 16, and in the vicinity of the injection positions P of the water jets 17a and 17b, for example, the strength at which iron powder is not peeled off from the belt 16 by water injection. 750G, in the vicinity of the suction port of the iron powder suction port 18, the strength is 190G, for example, the strength at which the iron powder is peeled off by the suction of the iron powder suction port 18, although it does not fall due to vibration due to transportation or the like.

Next, when the slurry flows into the housing 11 from the inflow port 13, the flow velocity at the time of inflow decreases while diffusing in the extending space 25. The slurry comes into contact with the magnetized belt 16 in a state where the flow velocity is sufficiently lowered, and iron powder adheres to the belt 16. Then, when the belt 16 rotates and passes through the injection position P in the ascending portion 160, soil particles other than iron powder are removed (washed) by the water jets 17a and 17b. The soil particles that are removed from the belt 16 by the water jets 17a and 17b and settled when flowing in from the inflow port 13 are discharged from the outflow port 14 or the discharge port 15.

Subsequently, iron powder is recovered by being sucked by the iron powder suction port 18 from the belt 16 from which impurities other than iron powder have been removed by the water jets 17a and 17b. Since the magnetic field is relatively weak at the suction position of the iron powder suction port 18, almost all the iron powder adhering to the belt 16 can be recovered. Iron powder is recovered from the slurry by the above procedure.

According to the magnetic material recovery device 6 of the injection stirring system 1, the iron powder contained in the slurry is attached to the rotary belt 16 formed in a mesh shape magnetized by the magnetic field generated by the magnetic field generating unit 9. Then, after removing excess soil particles and the like other than the iron powder adhering to the belt 16 by the water jets 17a and 17b, the iron powder is collected from the belt 16 at the iron powder suction port 18. As a result, iron powder can be recovered directly from the slurry containing soil, muddy water, and the like, so that iron powder can be efficiently recovered without the trouble of removing muddy water. Further, since a series of processes from the discharged slurry to the recovery of iron powder can be performed by one device, it is not necessary to arrange a device such as a belt conveyor. Therefore, the cost can be reduced and the size of the device can be reduced.

At this time, in the magnetic material recovery device 6, the ascending portion 160 of the belt 16 is located closer to the magnetic field generating portion 9, and the belt 16 is arranged so that the influence of the magnetic field becomes weaker as the belt 16 moves from the lower side to the upper side. Therefore, in the belt 16, there is a region where the portion to which the iron powder is attached is pulled in the traveling direction by the magnetic field generating portion 9 (mainly the first half portion 160a). Therefore, it is possible to cancel the pulling force (mainly the latter half 160b) that exists in the conventional magnetic material recovery device in the direction opposite to the traveling direction, thereby suppressing an increase in power consumption. For example, in the experiments of the present inventors, it was confirmed that when the magnetic material recovery device of the present embodiment is operated at a rotation speed requiring a current of 12 A or more in the conventional magnetic material recovery device, a current of 5 to 6 A is sufficient. Has been done. That is, a power saving effect of 50% or more is expected as compared with the conventional one.

Further, in the magnetic material recovery device 6, since the extending space 25 for buffering the flow of the slurry flowing in from the inflow port 13 is provided between the inflow port 13 and the belt 16, the slurry is diffused in the extending space 25. In the process of doing so, the momentum at the time of inflow weakens, and when it comes into contact with the belt 16, the flow velocity is sufficiently reduced. Therefore, a part of the iron powder adhering to the belt 16 is prevented from coming off from the belt 16 due to the contact of the slurry, so that the recovery rate of the iron powder is improved. In the experiments of the present inventors, when the flow rate of the slurry was 1.2 m ³ / min, the recovery rate of iron powder was about 90% in the conventional magnetic material recovery device, but the magnetic material of the present embodiment. In the recovery device 6, the recovery rate was 99.7% or more.

Further, since the iron powder suction port 18 is provided so as to incline in a direction away from the magnetic field generating portion 9, the iron powder passing through the inside of the iron powder suction port 18 is not strongly pulled by the magnetic field generating portion 9. , Can pass through the iron powder suction port 18.

Further, in the magnetic material recovery device 6, since the rotating body 21 that abuts on the ascending portion 160 is provided between the ascending portion 160 and the magnetic field generating portion 9, the belt 16 is excessively pulled toward the magnetic field generating means side. The belt 16 is prevented from rubbing against the inner surface of the housing 11 even when the magnetic field is strong, and the belt 16 can rotate smoothly.

Further, the magnetic material recovery device 6 is provided with a discharge port 15 below the belt 16 (lower part of the housing 11) to discharge soil particles (sand) other than iron powder. Soil particles (soil) of 0.3 to 1.3 t / m ³ are mixed in the slurry. Therefore, by providing the discharge port 15 below the belt 16, soil particles can be discharged without accumulating in the apparatus. As a result, iron powder can be suitably recovered even when the slurry contains soil or the like. In addition, soil particles can generally be used as soil (valuable resources), and most of the iron powder recovered is discharged, so that the reuse of soil can be promoted.

Further, the water jets 17a and 17b are arranged so as to sandwich the belt 16 so that the fluid is injected on both sides of the belt 16. With such a configuration, impurities such as soil particles other than iron powder adhering to the belt 16 can be more effectively removed (cleaned). As a result, only iron powder can be recovered with high efficiency.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, in the above embodiment, the magnetic material is iron powder (Fe), but other magnetic material may be used.

Further, in the above embodiment, the driving rotating body 19 and the driven rotating body 20 are arranged and fixed in the horizontal direction on the same straight line along the vertical direction, but both rotating bodies are arranged and fixed in the vertical direction. It does not have to be in the same straight line along the line, and the extending direction may be inclined from the horizontal direction. In this case, the portion of the belt 16 from the low position to the high position on the side closer to the magnetic field generating portion 9 is regarded as the ascending portion 160.

Further, although the embodiment having the extending space 25 as the buffering means is shown in the above embodiment, other means for reducing the flow velocity may be used as the buffering means. For example, a member may be provided in the housing 11 and the inflowing mixture may collide with the member to reduce the flow velocity. As an example, as shown in FIG. 5, the housing 11 may have a guide plate 25a for colliding the mixture flowing in from the inflow port 13 and guiding the mixture downward. Also in this embodiment, it is possible to prevent the mixture from coming into contact with the belt 16 with the force of inflow.

Further, in the above embodiment, the inflow port 13 is provided at the position farthest from the magnetic field generating portion 9, but the inflow port 13 may be provided at another position.

Further, in the above embodiment, the iron powder suction port 18 is provided so as to be inclined with respect to the magnetic field generating portion 9 in order to reduce the influence of the magnetic field when collecting the iron powder. Instead of this, the iron powder suction port 18 is provided. A magnetic field shielding plate may be arranged between the mouth 18 and the magnetic field generating portion 9.

Further, in the above embodiment, one main body 10 is provided for one magnetic field generating unit 9, but as shown in FIG. 6, two main bodies are provided for one magnetic field generating unit 9. The mode may be such that the parts 10 and 10 are provided. In this case, the processing amount per one magnetic field generating unit 9 can be doubled.

Further, as the entire injection stirring system, as shown in FIG. 7, a classification facility 29 may be provided immediately before the slurry is introduced into the magnetic material recovery device 6. Since the diameter of the iron powder used is usually 0.5 mm or less, if the sand is classified to about 0.5 mm, sand of 0.5 mm or more can be separated from the slurry in advance, and this can be separated into the sand storage pit 29A. Can be done. As a result, the load on the magnetic material recovery device 6 in the subsequent stage can be reduced.

1 ... Injection stirring system, 3 ... Injection pipe, 4 ... Guide pipe, 5 ... Discharge slurry storage tank, 6 ... Magnetic material recovery device, 8A ... Blower (recovery means), 9 ... Magnetic field generator (magnetic field generation means), 10 ... main body, 11 ... housing, 13 ... inflow port, 15 ... outlet, 16 ... belt, 17a, 17b ... water jet (fluid injection means), 18 ... iron powder suction port (collection means), 25 ... extending space (Cushioning means), 160 ... ascending part, 160a ... first half part, 160b ... second half part, L ... transport line.

Claims (4)

A magnetic material recovery device that recovers the magnetic material from a mixture containing a magnetic material.
The inflow port into which the mixture flows and
A magnetic field generating means for generating a magnetic field and
A rotary belt provided under the influence of the magnetic field generated by the magnetic field generating means and to which the magnetic material is attached by being magnetized by the magnetic field.
A fluid injection means for injecting a fluid onto the belt and removing the mixture other than the magnetic material adhering to the belt.
A recovery means for recovering the magnetic material by suction from the belt from which the mixture other than the magnetic material has been removed by the fluid injection means is provided.
The belt and the magnetic field generating means are so that the belt has an ascending portion from the lower side to the upper side near the magnetic field generating means, and the influence of the magnetic field becomes weaker as the belt moves from the lower side to the upper side. It is arranged so that
The fluid injection means and the recovery means are provided at positions where they operate in a process in which the influence of the magnetic field on the belt is weakened.
A buffer means for buffering the flow of the mixture flowing in from the inlet is provided between the inlet and the belt.
A magnetic material recovery device including a pressing roller that abuts on the ascending portion between the ascending portion and the magnetic field generating means. Said buffer means is a space that extends in a direction away from the belt, magnetic collecting apparatus according to claim 1. The magnetic material recovery device according to claim 1 or 2 , wherein the recovery means is provided so as to incline in a direction away from the magnetic field generation means. One of claims 1 to 3 , wherein the one magnetic field generating means includes a plurality of main bodies including the inflow port, the belt, the fluid injection means, the recovery means, and the buffering means. The magnetic material recovery device according to the first paragraph.

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