JP7038372B2 - Magnetic force sorting device, usage of magnetic force sorting device and pollutant dry treatment system - Google Patents

Description

The present invention relates to a magnetic force sorting device that can be used for treating powdery contaminants such as soil contaminated with radioactive substances, a method of using the magnetic force sorting device, and a contaminant dry treatment system.

The treatment of radioactively contaminated soil can be roughly divided into a wet method and a dry method, each of which has advantages and disadvantages. One of the advantages of the dry method is that it does not cause a problem of wastewater treatment, and many treatment methods have been proposed for the dry method (see, for example, Patent Document 1).

Patent Document 1 discloses a magnetic force sorting device provided with a particle size variable mechanism capable of changing the particle size of the sorted object, whereby sorting corresponding to the concentration of contaminants or depending on the properties of the sorted object is made. Sorting is possible. In addition, as a method of using the magnetic force sorting device, the magnetic flux density on the surface of the rotating drum, the supply speed of the object to be sorted, the rotating speed of the rotating drum, the mixing ratio of the powdery contaminants with the ferromagnetic powder and / or the paramagnetic powder, and the subject. It is said that the sorted product can be sorted to a desired particle size by adjusting any one of the water content of the sorted product.

Japanese Unexamined Patent Publication No. 2017-13744

The magnetic force sorting device using the rotary drum type magnetic separator described in Patent Document 1 is provided with a particle size variable mechanism capable of changing the particle size of the sorted object, and also adjusts the rotation speed of the rotary drum. Depending on the method, sorting according to the concentration of contaminants or sorting according to the properties of the object to be sorted is possible, but further improvement in classification performance and usability are expected.

An object of the present invention is to provide a magnetic force sorting device having excellent classification performance and usability as compared with a conventional magnetic force sorting device, a method of using the magnetic force sorting device, and a contaminant dry treatment system.

The present invention is a magnetic separation device that sorts an object to be sorted, which is a mixture of powdery contaminants and ferromagnetic powder and / or paramagnetic powder, and is a rotary drum type with a magnet arranged inside. The magnetic separator, a sorting device installed at the sorting material discharge port of the magnetic separator, which divides the sorted material into particles having a particle size of N or more (N is an integer of 2 or more) , and supplies the material to be sorted to the magnetic separator. The magnetic separator comprises a supply device provided with a thinning means for thinning the material to be sorted discharged to the discharge port, and the magnetic separator is provided with a position variable mechanism capable of changing the position of the magnet with respect to the rotating drum. The sorting device is provided with a particle size variable mechanism capable of changing the particle size to be separated, and the thinning means is a trough having a triangular tooth shape, a comb tooth shape, a corrugated shape, or a trapezoidal shape at the tip in a plan view. Yes, or the thinning means is a magnetic separation device characterized in that, in a plan view, a triangular tooth-shaped or comb-shaped or corrugated or trapezoidal member is a trough attached to a tip portion .

Further, in the magnetic force sorting device of the present invention, the sorting device includes a partition plate for classifying the sorted items into two or more particle sizes, or two or more separate collection tanks for classifying the sorted items into two or more particle sizes and collecting them. It is characterized by comprising a moving means for moving the partition plate or the separated collection tank up and down and / or left and right.

Further, in the magnetic force sorting device of the present invention, the sorting device includes a movable partition plate for dividing the sorted object into two or more particle sizes, and the movable partition plate has a structure and / or a height configured to be movable to the left and right. It is characterized in that it has a structure that is variably configured.

Further, in the magnetic force sorting device of the present invention, the sorting device has a partition plate for classifying the sorted items into 3 or more particle sizes or three or more separate collection tanks for classifying and collecting the sorted items into 3 or more particle sizes. It is characterized by that.

Further, in the magnetic force sorting device of the present invention, the sorting device is characterized by comprising a mixing means for mixing two or more of the sorted items further divided into three or more categories.

Further, the magnetic force sorting device of the present invention further includes at least a sorting material discharge port of the magnetic separator, a casing covering the sorting device, and a dust collector for sucking and collecting the sorting material floating in the casing. The suction port of the dust collector is provided on the side of the sorting object having a small particle size to be sorted by the sorting device.

Further, the magnetic force sorting apparatus of the present invention is further provided with a speed variable means capable of varying the rotational speed of the rotating drum of the magnetic separator.

Further, the magnetic force sorting device of the present invention further includes a water content adjusting means for adjusting the water content of the object to be sorted, and the magnetic force sorting device sorts the object to be sorted whose water content is adjusted by the water content adjusting means. It is characterized by that.

Further, the magnetic force sorting apparatus of the present invention is characterized in that the ferromagnetic powder is a ferromagnetic powder containing iron oxide as a main component.

Further, the magnetic force sorting apparatus of the present invention is characterized in that the powdery and granular contaminants are radioactive material-contaminated soil.

Further, the present invention is a method of using the magnetic force sorting device, wherein the sorted object is sorted to a desired particle size by adjusting at least one of the following groups (A). How to use.
(A) The position of the magnet with respect to the rotating drum of the magnetic separator, the magnetic flux density on the surface of the rotating drum, the supply speed of the object to be sorted, the rotation speed of the rotating drum, the particulate contaminants and the ferromagnetic powder and / or the paramagnetic powder. Mixing ratio, water content of the material to be sorted

Further, the present invention is a contaminant dry treatment system that separates powder or granular material according to the concentration of contamination, and is a magnetic sorting device, a powder or granular material, a ferromagnetic powder, and / or a normal magnetic powder. A mixing device that mixes with, a magnetic powder supply device that supplies ferromagnetic powder and / or paramagnetic powder to the mixing device, and a contaminant transfer that transfers stored powder or granular material to the mixing device. The device is provided with an object transfer device for transferring a mixture of powder or granular material and a mixture of ferromagnetic powder and / or paramagnetic powder from the mixing device to the supply device, and the contaminant transfer device and the device. / Or, the object transfer device may be one of crushing secondary particles, polishing the surface of powder-like contaminants, and refining powder-grain-like contaminants during transfer. It is a contaminant dry treatment system characterized by exerting one or more actions.

Further, the pollutant dry treatment system of the present invention is characterized in that it is mounted on a vehicle and can be separately operated while mounted on the vehicle.

According to the present invention, it is possible to provide a magnetic force sorting device, a method of using the magnetic force sorting device, and a contaminant dry treatment system, which are superior in classification performance and usability as compared with a conventional magnetic force sorting device. This enables sorting according to the concentration of contaminants or sorting according to the properties of the object to be sorted.

It is a side view and the front view which show the schematic structure of the magnetic force sorting apparatus 1 of 1st Embodiment of this invention. It is a figure which shows the structure of the rotary drum 11 of the magnetic force sorting apparatus 1 of 1st Embodiment of this invention. It is a figure for demonstrating the structure of the fixing jig 66 of the magnetic force sorting apparatus 1 of 1st Embodiment of this invention, and the arrangement of the magnet part 18 of a rotary drum 11. It is a block diagram around the sorting apparatus 31 of the magnetic force sorting apparatus 1 of 1st Embodiment of this invention. It is a figure for demonstrating the structure of the tip part of the supply device 71 of the magnetic force sorting apparatus 1 of 1st Embodiment of this invention. It is a schematic diagram which shows the force acting on the object 201 of the magnetic force sorting apparatus 1 of 1st Embodiment of this invention. It is a schematic diagram for demonstrating the estimated locus of the particle emitted away from the rotating drum 11 of the magnetic force sorting apparatus 1 of 1st Embodiment of this invention. It is a figure which shows the relationship between the estimated locus of the particle which is separated from the rotating drum 11 and the rotation speed of a rotating drum 11 at the time of rotation of the magnetic force sorting apparatus 1 of 1st Embodiment of this invention at a low speed to a medium speed. be. It is a figure which shows the relationship between the estimated locus of the particle which is separated from the rotating drum 11 at the time of rotation of the magnetic force sorting apparatus 1 of 1st Embodiment of this invention, and the rotation speed of a rotating drum 11. be. It is a side view and the front view which show the schematic structure of the magnetic force sorting apparatus 2 of the 2nd Embodiment of this invention. It is a block diagram around the sorting apparatus 41 of the magnetic force sorting apparatus 2 of the 2nd Embodiment of this invention. It is a side view which shows the schematic structure of the magnetic force sorting apparatus 3 of the 3rd Embodiment of this invention. It is a side view which shows the schematic structure of the magnetic force sorting apparatus 4 of the 4th Embodiment of this invention. It is a figure which shows the schematic structure of the magnetic force sorting apparatus 5 of the 5th Embodiment of this invention, (A) is a side view, (B) is a schematic diagram for explaining the operation and effect of the sorting apparatus 321. It is a figure which shows the schematic structure of the magnetic force sorting apparatus 6 of the 6th Embodiment of this invention. It is a figure which shows the schematic structure of the pollutant dry treatment system 101 of the 7th Embodiment of this invention. It is a figure for demonstrating the structure of the sorting material discharger 81 provided in the magnetic force sorting apparatus 7 of the pollutant dry processing system 101 of the 7th Embodiment of this invention. It is a figure which shows the schematic structure of the pollutant dry treatment system 102 of 8th Embodiment of this invention. It is a figure which shows the position of the partition plate in the triangular tooth effect confirmation test which is an Example of this invention. It is a figure which shows the relationship between the supply rate and the mass ratio in the triangular tooth effect confirmation test which is an Example of this invention. It is a figure which shows the relationship between the supply rate and the mass ratio in the triangular tooth effect confirmation test which is an Example of this invention. It is a figure which shows the relationship between the supply rate and the mass ratio in the triangular tooth effect confirmation test which is an Example of this invention. It is a figure which shows the position of the partition plate in the pollutant dry treatment system test which is an Example of this invention. It is a particle size distribution and radioactivity concentration distribution map of the field raw soil used in the pollutant dry treatment system test which is an Example of this invention. It is a classification result of the pollutant dry treatment system test which is an Example of this invention. It is an embodiment of the present invention, and is a particle size distribution when passing through decomposed granite soil using a tube type conveyor. It is a classification result of the operation condition comparison test (drum peripheral speed: 87 m / min) using the simulated raw soil which is an example of this invention. It is a classification result of the operation condition comparison test (drum peripheral speed: 71 m / min) using the simulated raw soil which is an example of this invention. It is a classification result of the operation condition comparison test (drum peripheral speed: 57 m / min) using the simulated raw soil which is an example of this invention. It is a figure which shows the relationship between the large particle size side partition position and the mass ratio in the operation condition comparison test (large particle size side partition position) using the simulated raw soil which is an Example of this invention. It is the classification result of the operation condition comparison test (large particle size side partition position: −150 mm) using the simulated raw soil which is an example of this invention. It is the classification result of the operation condition comparison test (large particle size side partition position: -100 mm) using the simulated raw soil which is an example of this invention. It is the classification result of the operation condition comparison test (large particle size side partition position: -60 mm) using the simulated raw soil which is an example of this invention. The mode of the mode standardized mass ratio of Category B when the large particle size side partition position is changed in the operating condition comparison test (large particle size side partition position) using the simulated raw soil which is an embodiment of the present invention. It is a figure which shows. It is a figure which shows the relationship between the large particle size side partition position and the classification index particle diameter in the operation condition comparison test (large particle size side partition position) using the simulated raw soil which is an Example of this invention. It is a figure which shows the relationship between the small particle size side partition position and the mass ratio of the operation condition comparison test (small particle size side partition position) using the simulated raw soil which is an Example of this invention. It is a figure which shows the relationship between the processing speed and the mass ratio of the operation condition comparison test (small particle size side partition position) using the simulated raw soil which is an Example of this invention. It is a figure which shows the relationship between the small particle size side partition position and the mass ratio of the operation condition comparison test (small particle size side partition position) using the simulated raw soil which is an Example of this invention. It is a classification result of the operation condition comparison test (small particle size side partition position: 100 mm) using the simulated raw soil which is an example of this invention. It is a classification result of the operation condition comparison test (small particle size side partition position: 150 mm) using the simulated raw soil which is an example of this invention. It is the classification result of the operation condition comparison test (small particle size side partition position: 200 mm, processing speed: 600 kg / h) using the simulated raw soil which is an example of this invention. It is the classification result of the operation condition comparison test (small particle size side partition position: 200 mm, processing speed: 2200 kg / h) using the simulated raw soil which is an example of this invention. It is the classification result of the operation condition comparison test (small particle size side partition position: 200 mm, processing speed: 400 kg / h) using the simulated raw soil which is an example of this invention. It is the classification result of the operation condition comparison test (small particle size side partition position: 250 mm, processing speed: 400 kg / h) using the simulated raw soil which is an example of this invention. The mode of the mode standardized mass ratio of Category A when the small particle size side partition position is changed in the operating condition comparison test (small particle size side partition position) using the simulated raw soil which is an embodiment of the present invention. It is a figure which shows. It is a figure which shows the relationship between the small particle size side partition position and the classification index particle diameter of the operation condition comparison test (small particle size side partition position) using the simulated raw soil which is an Example of this invention. The mode of the mode standardized mass ratio of Category A when the small particle size side partition position is changed in the operating condition comparison test (small particle size side partition position) using the simulated raw soil which is an embodiment of the present invention. It is a figure which shows. It is a figure which shows the relationship between the processing speed and the classification index particle diameter of the operation condition comparison test (small particle diameter side partition position) using the simulated raw soil which is an Example of this invention. The mode of the mode standardized mass ratio of Category A when the small particle size side partition position is changed in the operating condition comparison test (small particle size side partition position) using the simulated raw soil which is an embodiment of the present invention. It is a figure which shows. It is a figure which shows the relationship between the small particle size side partition position and the classification index particle diameter of the operation condition comparison test (small particle size side partition position) using the simulated raw soil which is an Example of this invention.

1A and 1B are views showing a schematic configuration of a magnetic force sorting apparatus 1 according to a first embodiment of the present invention, in which FIG. 1A is a side view and FIG. 1B is a front view. FIG. 2 is a configuration diagram of the rotary drum 11 of the magnetic force sorting device 1, and FIG. 3 is a diagram for explaining the configuration of the fixing jig 66 and the position of the magnet portion 18 of the rotary drum 11. 4A and 4B are configuration views around the sorting device 31, where FIG. 4A is a side view, FIG. 4B is a front view, and FIG. 5 is for explaining the structure of the tip of the supply device 71 of the magnetic force sorting device 1. It is a figure. FIG. 6 is a schematic diagram showing a force acting on the object to be sorted 201 of the magnetic force sorting device 1 of the first embodiment of the present invention.

The magnetic separation device 1 includes a drum rotary type magnetic separator 10, a supply device 71 that quantitatively supplies the material to be sorted to the magnetic separator 10, a sorting device 31 that separates the material to be sorted 201, and a pedestal 51 that supports the magnetic separator 10. The object to be sorted 201, which is a mixture of a powdery contaminant and a ferromagnetic powder and / or a paramagnetic powder, which is continuously supplied via the supply device 71, is continuously sorted. , The object to be sorted 201 is sorted into 3 categories. In the present embodiment, the object to be sorted 201 is sorted into three categories, but it is also possible to increase the number of partition plates 32a and 33b to three or more and to sort the object to be sorted 201 into four or more categories.

The magnetic separator 10 is the same as a known drum rotary magnetic separator in that it has a rotary drum 11 in which a magnet portion 18 is arranged, but the magnetic separator 10 easily changes the position of the magnet portion 18. Equipped with a possible position variable mechanism.

The rotary drum 11 includes a rotatable cylindrical outer drum 13 and a cylindrical inner drum 16 arranged inside the outer drum 13, and the inner drum 16 is a magnet portion in which a semi-cylindrical magnet is arranged. Has 18. In FIGS. 1 and 3A, the right half is the magnet portion 18.

The outer drum 13 is a non-magnetic cylindrical body, and flange portions 14 and a rotating shaft 15 are provided on both sides of the outer drum 13. In the outer drum 13, the rotating shaft 15 is supported by the bearing 64 and rotatably fixed to the casing 21, and one rotating shaft 15 is connected to the drive device 61 (see FIG. 1 (B)).

The inner drum 16 is a cylindrical body having an outer diameter slightly smaller than the inner diameter of the outer drum 13, and has a semi-cylindrical magnet portion 18. The region of the rotating drum 11 close to the magnet portion 18, in FIG. 1, the right half is the magnetic field application portion and the left half is the magnetic field non-application portion. The magnet portion 18 may be either a permanent magnet or an electromagnet.

The inner drum 16 is provided with rotating shafts 17 on both sides, and the bearing 65 attached to the outer peripheral surface of the rotating shaft 17 is attached in a state of being fitted into the inner concave portion of the rotating shaft 15 of the outer drum 13. One of the rotating shafts 17 protrudes from the casing 21 and a handle 19 for rotating the inner drum 16 is provided at the tip thereof (see FIG. 2). Further, a fixing jig 66 for fixing the rotating shaft 17 to the rotating shaft 17 protruding from the casing 21 is provided. In the present embodiment, the fixing jig 66 is mainly used to form the position variable mechanism.

The fixing jig 66 tightens or tightens a pair of half-split fasteners 67 that cover the rotating shaft 17, a pair of supports 68 whose one end that supports the fasteners 67 is fixed to the casing 21, and the fasteners 67. Includes a fastening lever 69 for loosening. In such a fixing jig 66, the position of the inner drum 16 is fixed when the fastener 67 is tightened, and the inner drum 16 can be rotated by loosening the fastener 67.

The inner drum 16 is arranged concentrically with the outer drum 13 with a slight gap, and since the fixing jig 66 is provided, the outer drum 13 can be rotated independently of the inner drum 16. can. Further, since the inner drum 16 can change the inclination angle of the magnet portion 18 with respect to the baseline (vertical line) of the rotating drum 11 in the range of 0 to θ ₁ (see FIG. 3 (B)), the object to be sorted 201, particularly fine particles. The timing of withdrawal from the rotating drum 11 can be changed. This makes it possible to expand the particle size selection range. The procedure for attaching the rotary drum 11 to the casing 21 is not limited to this embodiment.

The casing 21 has a rectangular parallelepiped shape, and a plate material is attached to the other five surfaces except the bottom surface to form a wall. The casing 21 is fixed on a pedestal 51 having legs 53 that can be stably installed, and the pedestal 51 secures a space below the casing 21 for installing the sorting device 31.

The ceiling surface 22 of the casing 21 is provided with an input port 23 for the object to be sorted 201, and the input port 23 is provided with a chute 24 for guiding the object to be sorted 201 to a predetermined position of the rotary drum 11. .. The bottom surface of the casing 21 is fully open to serve as a discharge port 25 for the sorted material 202. The chute 24 is installed so as to supply the object to be sorted 201, which is quantitatively supplied via the supply device 71, to the vicinity of the upper end of the magnetic field application portion of the rotary drum 11. Further, the chute 24 has the same width as the width of the rotary drum 11 in order to evenly supply the object to be sorted 201 in the width direction of the rotary drum 11.

The sorting device 31 divides the sorting object 202 that falls from the discharging port 25 into three categories according to the falling position, and is arranged below the discharging port 25. The sorting device 31 has two partition plates 32a and 32b and a linear rail 36 that slidably supports each of the partition plates 32a and 32b, and each of the partition plates 32a and 32b is a sorting object that falls from the discharge port 25. It corresponds to 202 and has a movable structure whose position can be changed. The movable partition plates 32a and 32b function as a particle size variable mechanism capable of changing the particle size to be divided.

The partition plate 32a includes a vertical plate 33a whose upper end faces the discharge port 25, an inclined plate 34a connected to the lower end of the vertical plate 33a, and a locking body 35a which is slidably locked to the linear rail 36. Ru. The vertical plate 33a is a member that separates the falling sorting material 202, and the inclined plate 34a functions as a chute for sending the sorting material 202 to the separated collection tank 38. Therefore, the inclined plate 34a is installed so that the side connected to the vertical plate 33a is higher, and the cross-sectional shape is U-shaped. The locking body 35a is a plate-shaped member, and is fixed to the ends of both side surfaces of the vertical plate 33a.

The linear rail 36 is a straight elongated plate-shaped member, and is attached to the ends of both side surfaces of the gantry 51 so as to be bridged over the front and back of the gantry 51, respectively. The partition plate 32a is arranged orthogonally to the linear rail 36 so that the vertical plate 33a is placed between the two linear rails 36 and the locking body 35a is placed on the linear rail 36. As a result, the partition plate 32a can be locked to the linear rail 36 via the locking body 35a and can move left and right (left side and right side in FIG. 1A) on the linear rail 36 (FIG. 1 (A). )reference).

In the partition plate 32b, the inclined direction of the inclined plate 34b is opposite to the inclined direction of the inclined plate 34a, but the structure of the partition plate 32b is the same as that of the partition plate 32a.

The sorting device 31 configured as described above can easily change the sizes of the division A, the division B, and the division N by moving the positions of the partition plates 32a and / or the partition plates 32b to the left and right. By moving the partition plate 32a to the left in the side view, it is possible to increase the size of the division N, so that the non-magnetic material and a part of the magnetic material can be collected in the division N. Further, when the vertical plate 33a of the partition plate 32a and the vertical plate 33b of the partition plate 32b are brought into contact with each other, the division B can be eliminated and the division can be divided into two divisions, the division N and the division A.

The gantry 51 is a gantry having a leg 53 that can be stably installed and has a height at which a sorting device 31 is installed below the casing 21 and a separate collection tank 38 can be arranged. The ceiling surface 52 of the gantry is open so as to match the bottom surface of the casing 21. A transparent or opaque panel 54 is attached to the upper half of each of the front side, the back side, and both side surfaces on the side surface portion of the gantry 51. It is preferable to use a transparent panel for the panel 54 because the operating status can be confirmed. The tip end side of the inclined plate 34a projects from under the panel 54 on the front side toward the front side of the gantry 51. The tip end side of the inclined plate 34b projects from under the panel 54 on the back surface side toward the back surface side of the gantry 51.

The drive device 61 is a device for rotating the rotary drum 11, and includes a drive motor 62, a speed reducer 63, and a rotation transmitter connecting the speed reducer 63 and the rotary drum 11. The speed reducer 63 is a speed reducer whose reduction ratio can be changed, whereby the rotation speed of the rotary drum 11 can be changed. The rotation transmitter is composed of a sprocket on the speed reducer 63 side (not shown), a sprocket on the rotating drum 11 side (not shown), a chain connecting these, a drive shaft, etc. (not shown), and rotates the rotation of the speed reducer 63. It is transmitted to the drum 11.

In the above embodiment, the rotation speed of the rotary drum 11 is varied by using the variable type speed reducer 63, but the rotation speed of the rotary drum 11 may be variable by using an inverter motor. Further, the rotation transmitter is not limited to the above embodiment.

In the present embodiment, the supply device 71 that continuously and quantitatively supplies the material to be sorted 201 to the magnetic separator 10 is a vibration feeder 71. The vibration feeder 71 is a device that vibrates the trough 72 arranged under the supply port of the object hopper 77, drops the object 201 from the trough tip 73 onto the chute 24, and supplies the object 201. be.

The basic configuration of the vibration feeder 71 of the present embodiment is not particularly different from that of a known vibration feeder, but the shape of the trough tip 73 is characteristic. The trough tip of the conventional vibration feeder is straight in a plan view, but in the vibration feeder 71 of the present embodiment, a triangular tooth-shaped (saw blade-shaped) plate 74 is attached to the tip of the trough 72 in a plan view. (See Fig. 5).

When the object to be sorted 201 is like soil particles to which magnetic iron powder is attached, the soil particles discharged from the vibration feeder 71 may be bonded and enlarged, and the secondary particle diameter may increase. Such enlargement due to the binding of soil particles is more likely to occur as the supply amount increases. Since the magnetic force sorting device 1 of the present embodiment attempts to classify the object to be sorted 201 according to the particle size, if the object to be sorted adheres to the object to be sorted having a large particle size, it is originally classified into the fine items. The fine objects to be sorted, which should have been classified, are classified into categories having a large particle size, which is not preferable.

The triangular tooth-shaped plate material 74 in a plan view has a longer peripheral length than a straight plate material in a plan view. When the object to be sorted 201 is dropped from the trough 72 having such a plate material 74 attached to the tip portion, the object to be sorted 201 falls in a widely dispersed state because the contact area between the object to be sorted 201 and the trough 72 is large. do. As a result, the object to be sorted 201 is thinned and supplied to the magnetic separator 10 in a state where the particles are separated from each other.

As described above, the vibration feeder 71 of the present embodiment has a supply amount because the triangular tooth-shaped plate material 74 attached to the tip of the trough 72 acts as a thinning means for thinning the material to be sorted 201. Even if there are many cases, the classification performance can be maintained high.

The triangular tooth-shaped plate material 74 in the vibration feeder 71 of the present embodiment thins the material to be sorted 201 by increasing the contact area between the material to be sorted 201 and the trough 72 (plate material 74) when the material to be sorted 201 is dropped. Since it is stratified and promotes separation between particles, a plate material having a long peripheral length in a plan view may be a plate material other than the triangular tooth-shaped plate material 74. Examples of the plate material having a long peripheral length in the plan view include a comb-shaped plate material, a corrugated plate material, and a trapezoidal plate material in the plan view (see FIG. 5B).

In the vibration feeder 71 of the present embodiment, the triangular tooth-shaped plate 74 is attached to the tip of the trough 72, but the shape of the trough tip 73 is triangular (saw blade-shaped), comb-toothed, corrugated, or trapezoidal. May be. The thinning means as described above can be applied not only to the vibration feeder but also to the belt feeder and the like. If the feeder 71 is a belt feeder, a triangular tooth-shaped plate 74 may be attached to the tip of the belt, which is the drop port of the object to be sorted 201, in the full width direction.

The object 201 to be sorted, which falls from the trough tip 73 of the vibration feeder 71 or the tip of the plate material 74, slides down the chute 24 on the slope and reaches the rotary drum 11. When the distance that the chute 24 slides down is long, small particles having a large friction coefficient tend to stay on the inclined surface, and if the large particles slide down so as to entrain them, the separation between the particles may deteriorate. Therefore, it is preferable to make the distance between the trough tip 73 or the plate 74 tip of the vibration feeder 71 and the rotary drum 11 as short as possible.

The object to be sorted 201 that can be sorted by the magnetic force sorting device 1 is basically a mixture of a magnetic substance and a non-magnetic object, and is not limited to the specific object to be sorted 201. Examples of the object to be sorted 201 include a mixture of a granular material-like contaminant and a ferromagnetic powder and / or a paramagnetic powder. When a ferromagnetic powder or the like and a granular material-like contaminant are mixed, the ferromagnetic powder or the like is adsorbed on the surface of the contaminant, and the mixture becomes a magnetic or non-magnetic particle depending on the particle size of the contaminant. ..

As the pollutants in the form of powders, the pollutants are heavy metals, dioxin, PCBs, residual organic pollutants (POPs) such as pesticides, radioactive substances, etc., and the pollutants are soil contaminated with the pollutants and incineration. Examples include ash, rubble, waste plastic, wood chips, and even mixtures thereof. The radioactive substance is not limited to a specific substance, and a wide range of radioactive substances such as cesium Cs, plutonium Pu, uranium U, and radium Ra can be targeted.

As the ferromagnetic powder, powders such as Fe-Ni alloy, Fe-Co alloy, Ni-Co alloy, stainless steel (Fe-Ni-Cr), Mn-Al magnet, samarium magnet, neodium magnet, magnetite, maghematite, and Ba ferrite. Can be mentioned. Examples of the paramagnetic powder include powders such as aluminum, dichromium trioxide, cobalt oxide, iron monoxide, ferrous hydroxide, wustite, and iron hydroxide-containing (other than δ). Of these, a ferromagnetic powder containing iron oxide as a main component is preferable, and magnetite powder is more preferable.

The hypothetical mechanism by which the ferromagnetic powder is adsorbed on the pollutant will be described below with the pollutant as soil. Since the soil surface is negatively charged due to the homomorphic substitution effect, positively charged cations are accumulated on the soil surface. Under such circumstances, when a negatively charged ferromagnetic powder is added, it is adsorbed around the cation, and as a result, it is adsorbed on the soil. If the amount of charge is large, it will be strongly adsorbed to the cation. On the other hand, due to its own charge repulsion and electrostatic repulsion with the soil surface layer charge, the larger the amount of negative charge, the greater the dispersion force and the more it tries to diffuse uniformly to the soil surface layer.

Next, with reference to FIG. 6, the force acting on the object to be sorted 201 on the rotary drum 11 will be described. Here, the contaminant is soil particles, the ferromagnetic powder is magnetite powder, and a mixture thereof will be described as the subject 201.

Since magnetite, which is a ferromagnetic powder, adheres to the surface of the object to be sorted 201 that has fallen onto the rotating rotating drum 11, the magnetic force induced by the external magnetic field H in the magnetic field application region of the rotating drum 11. It tries to be attached to the surface 12 of the rotating drum (outer drum) by M. Further, a normal force N and a centrifugal force C act on the object to be sorted 201 in the direction opposite to the magnetic force M. Further, the gravity G acts on the object to be sorted 201 in the vertical direction, and a frictional force F acts on the object to be sorted 201 with the rotating drum surface 12. The frictional force F is in the direction opposite to the rotation direction of the rotating drum 11.

Of the forces acting on the object to be sorted 201, the magnetic force M and the frictional force F act in the direction of holding the object to be sorted 201 on the surface 12 of the rotating drum, and conversely, the centrifugal force C and the gravity G (however θ <. 0) means that the object to be sorted 201 acts in a direction of pulling away from the surface 12 of the rotating drum. The object 201 to be sorted adheres to the surface 12 of the rotating drum due to these balances.

Assuming that the elevation angle of the object 201 on the rotating drum surface 12 from the horizontal is θ and the friction coefficient is μ, the balance of forces in the direction of the dotted line at the center of the drum in FIG. 6 is represented by the equations (1) and (2). The balance of forces in the direction perpendicular to the dotted line of the center of the drum is represented by the equations (3) to (5).

When the elevation angle θ at which the equation (1) holds is just balanced (separation threshold value θ _T ; −90 ° <θ _T <90 °) and θ becomes smaller than this, the object to be sorted 201 slides off the rotating drum surface 12. The magnitude of the force acting on the object to be sorted 201 differs depending on the magnetism characteristics of the object to be sorted 201, and the sorting threshold value θ _T also differs depending on the object to be sorted 201. Further, the magnitude of the force acting on the object to be sorted 201 also changes depending on the operating conditions of the magnetic force sorting device 1 and the device characteristics of the magnetic force sorting device 1.

The magnetizing characteristics of the object to be sorted include the particle size, shape, specific gravity, water content, amount of magnetite adhered, and the surface charged state of the object to be sorted 201.

As mentioned above, gravity acts to press against the rotating drum surface 12 as long as sin θ> 0, that is, θ> 0 °. When θ <0, it becomes a pulling force, which contributes to pulling the object to be sorted 201 away from the rotating drum surface 12. As for the centrifugal force C, if the radius of the rotating drum 11 is R, the velocity of the object to be sorted 201 is V, and the mass of the object to be sorted 201 is M ₀ , the equation (6) holds, and if the mass M ₀ is large, the centrifugal force C rotates. It becomes easy to peel off from the drum surface 12.

Generally, a particle having a small particle size has a small mass M ₀ , but a small amount of adhered ferromagnetic powder and a small magnetic force M. Assuming that the particles are spherical and the radius is r, the surface area is proportional to the square of the radius r and the volume is proportional to the cube of the radius r. Since the magnetite powder easily adheres to the soil particles and is considered to adhere in proportion to the surface area of the soil particles, the adhesion amount ∝ magnetic attachment force of the magnetite powder is proportional to the square of the particle radius r and the mass of the particles. M ₀ is proportional to the cube of the radius r. The magnetic force is proportional to the square of the particle size r, but the gravity acting on the peeling when θ <0 increases in proportion to the cube of the particle size r, so that the magnetism increases as the particle size r increases. The effect of peeling due to gravity is greater than the force of application.

From the above, regarding the particle size and specific gravity of the object to be sorted 201, the larger they are, the easier it is for the lower half of the rotating drum 11 to come off and fall. Regarding the amount of magnetite powder adhered, the larger the adhered amount, the larger the magnetic force M, and the more difficult it is to come off from the rotating drum surface 12. The smaller the particle size of the object to be sorted 201, the lighter its own weight, and the larger the amount of magnetite powder attached per unit weight, so that it is difficult to remove from the rotating drum surface 12. On the contrary, as the particle size increases, the weight becomes heavier, and the amount of magnetite adhered per unit weight decreases, so that the magnetite easily comes off from the rotating drum surface 12. The shape, water content, and surface charge state of the object to be sorted 201 affect the frictional force F.

The operating conditions of the magnetic force sorting device 1 include the rotation speed of the rotating drum 11 and the supply speed (processing speed) of the object to be sorted 201. As for the rotation speed of the rotating drum 11, the centrifugal force C increases as the rotation speed increases, and the object to be sorted 201 easily comes off from the rotating drum surface 12. The supply speed of the object to be sorted 201 is reflected in the thickness of the object to be sorted 201 on the rotating drum 11. That is, the higher the supply speed of the object to be sorted 201, the thicker the thickness of the object to be sorted 201 on the rotating drum 11. When the thickness of the object to be sorted 201 on the rotating drum 11 becomes thicker, the distance between the object to be sorted 201 on the upper surface side and the surface 12 of the rotating drum becomes larger, and the magnetic force M becomes difficult to act on the object to be sorted. The sorting object 201 is likely to come off from the rotating drum surface 12.

Next, the relationship between the rotation speed of the rotating drum 11 and the locus of particles emitted away from the estimated rotating drum 11 will be described. FIG. 7 is a schematic diagram for explaining an estimated locus of particles emitted away from the rotating drum 11 of the magnetic force sorting device 1. Here, the inclination angle θ ₁ of the magnet portion 18 is 0 °.

The estimated trajectory of the particles emitted away from the rotating drum 11 is Assumption 1: Air resistance is negligible, Assumption 2: Particles dropped on the rotating drum 11 are placed on the rotating drum 11 at the same speed as the drum rotation speed. Assuming that the particles move (ignoring slipping and rolling on the rotating drum 11), they are represented by equations (7) to (12). The estimated locus of the particles emitted away from the rotating drum 11 is affected by the rotational speed v of the rotating drum 11 as shown by the equations (7) to (12).

8 and 9 are diagrams showing the relationship between the estimated locus of particles emitted away from the rotating drum 11 and the rotational speed v of the rotating drum 11. Here, the inclination angle θ ₁ of the magnet portion 18 is 0 °. In FIGS. 8 and 9, the estimated loci of the particles emitted away from the rotating drum 11 are calculated using the equations (7) to (12). As shown in FIGS. 8 and 9, as the rotation speed v of the rotating drum 11 increases, the trajectory of the particles at the same height h (m) expands. Thereby, by changing the rotation speed v of the rotating drum 11, the particle size of the particles to be divided can be changed. 8 and 9 are examples of estimated trajectories of particles calculated by calculation, and are not limited to the numerical values shown in FIGS. 8 and 9.

Further, when the rotation speed v of the rotating drum 11 is increased, the spatial distribution width of the particle size is widened, so that the resolution of the classification particle size threshold can be finely set. In particular, the magnetic force sorting device 1 includes a sorting device 31 that can easily change the sizes of the division N, the division B, and the division A by moving the positions of the partition plate 32a and / or the partition plate 32b to the left and right. Therefore, if the rotation speed v of the rotary drum 11 is increased and used, the object to be sorted (contaminant) can be easily sorted to a desired concentration.

The device characteristics of the magnetic separation device 1 include the position of the magnet portion 18 of the magnetic separator 10 and the magnetic flux density on the drum surface.

The magnet portion 18 of the magnetic separator 10 has a semi-cylindrical shape, and the magnetic flux density drops sharply at the terminal end of the magnet portion 18. By changing the inclination angle θ ₁ (see FIG. 3B) from the baseline (vertical line) of the rotating drum 11, the objects to be sorted 201 pass near the lowest point of the rotating drum 11 and have the same spatial coordinates. The magnetic flux density can be changed with respect to the position. As a result, the position of the object to be sorted 201 detached from the rotating drum 11 can be adjusted, and the particle size sorting range by the sorting device 31 can be expanded.

The magnetism ratio of the object to be sorted 201 increases in proportion to the magnetic flux density of the rotating drum surface 12. An electromagnet is used for the magnet portion 18, and the magnetic flux density of the drum surface can be adjusted to control the magnetic adhesion ratio of the object to be sorted 201. Further, the material and surface condition of the outer drum 13 also affect the magnetism of the object to be sorted 201.

As described above, the force acting on the object to be sorted 201 on the surface of the rotating drum 12 differs depending on the properties of the object to be sorted 201, the operating conditions of the magnetic force sorting device 1, the device characteristics of the magnetic force sorting device 1, and the like. Surface magnetic flux density, supply speed of object 201, rotation speed of rotary drum 11, position of magnet portion 18 of magnetic separator 10 (tilt angle θ ₁ ), mixing ratio of soil particles and magnetite powder, water content of soil particles By adjusting at least one of them, the drop position of the object to be sorted 201 can be adjusted.

Next, the operation of the magnetic force sorting device 1 will be described with a mixture of radioactively contaminated soil and magnetite powder as the object to be sorted 201. Here, among the mixtures of radioactive material-contaminated soil and magnetite, those in which the magnetite powder adheres to the surface of the radioactive material-contaminated soil are referred to as magnetic soil particles.

The mixture of the radioactively contaminated soil and the magnetite powder sufficiently mixed using the mixing device is filled in the material hopper 77 to be sorted and then continuously quantitatively supplied to the magnetic separator 10 via the vibration feeder 71. ..

Among the objects to be sorted 201 that fell to the upper end of the magnetic field application portion on the rotating rotating drum 11 through the chute 24, the contaminated soil to which the magnetic soil particles having a considerably large particle size or the magnetite powder failed to adhere is the elevation angle. (See FIG. 6) slides down on the rotating drum 11 in the range of 0 ° <θ <90 °. These particles are collected in the category N partitioned by the partition plate 32a of the sorting device 31.

The magnetic soil particles having a medium particle size are desorbed and separated from the rotating drum surface 12 at an elevation angle θ <0 °, fall in a radial pattern, and are collected in Category B. The magnetic soil particles having a small particle size are desorbed and separated from the surface of the rotating drum 12 at an elevation angle θ≈−90 ° at the end of the magnetic field application portion of the rotating drum 11, fall in a radial pattern, and are collected in Category A.

It is known that the smaller the particle size of the radioactive material-contaminated soil, the higher the contamination concentration (for example, Japanese Patent Application Laid-Open No. 2013-242210, Table 1). As described above, the soil contaminated with radioactive substances having a small particle size is collected in Category A, the soil contaminated with radioactive substances having a large particle size is collected in Category N, and the soil contaminated with radioactive substances having an intermediate particle size is collected in Category B. , Concentrate and decontaminate soil contaminated with radioactive substances. In the above embodiment, the number of divisions divided by the sorting device 31 is 3, but the number of divisions can be 4 or more, whereby the soil contaminated with radioactive substances can be concentrated and decontaminated more appropriately. be able to.

Even if the pollutants are other than radioactive soil, the pollutants that are mainly adhered to, adsorbed or adhered to the solid surface in the form of powders have a higher concentration of the pollutants as the particle size is smaller. .. Such pollutants can also be concentrated and decontaminated in the same manner as soil contaminated with radioactive substances.

As described above, the magnetic force sorting device 1 of the first embodiment can classify the sorted object into three or more categories according to the drop position of the sorted object, and thus can perform sorting according to the concentration of the contaminant. .. Further, since the positions of the partition plates 32a and 32b, which are sorting devices, can be changed even if the properties of the contaminants, for example, the specific gravity and the water content, change, the contaminants can be classified into desired concentrations, and the contaminant 201 By adjusting the supply speed, the rotation speed of the rotating drum 11, the position of the magnet portion 18 of the magnetic separator 10, and the like, contaminants can be sorted to a desired concentration.

The magnetic force sorting device 1 of the first embodiment is configured so that the position of the inner drum 16 of the magnetic separator 10 can be changed by using the handle 19, but a gear mounting motor (not shown) for rotating the rotating shaft is attached. The motor may be used to rotate the inner drum 16 to change the position of the magnet portion 18.

10A and 10B are views showing a schematic configuration of a magnetic force sorting apparatus 2 according to a second embodiment of the present invention, in which FIG. 10A is a side view and FIG. 10B is a front view. FIG. 11 is a configuration diagram of the magnetic force sorting device 2 of the second embodiment of the present invention around the sorting device 41. The same configurations as those of the magnetic force sorting apparatus 1 of the first embodiment shown in FIGS. 1 to 5 are designated by the same reference numerals, and the description thereof will be omitted.

The basic configuration of the magnetic force sorting device 2 of the second embodiment of the present invention is the same as that of the magnetic force sorting device 1 of the first embodiment of the present invention, but the structure of the sorting device 41 is different. Similar to the sorting device 31, the sorting device 41 divides the sorting object 202 falling from the discharge port 25 into three categories according to the falling position, and has the same function as the sorting device 31.

The sorting device 41 is also arranged below the discharge port 25 like the sorting device 31. Similar to the sorting device 31, the sorting device 41 also has two partition plates 42a and 42b and a linear rail 36 that slidably supports the partition plates 42a and 42b. Each of the partition plates 42a and 42b has a movable structure that can change the position corresponding to the sorting material 202 that falls from the discharge port 25, and functions as a particle size variable mechanism that can change the particle size to be divided. ..

The partition plate 42a has a vertical plate 33a whose upper end faces the discharge port 25 like the partition plate 32a, and the partition plate 42b has a vertical plate 33b whose upper end faces the discharge port 25 like the partition plate 32b. Similar to the sorting device 31, the partition plates 42a and 42b also have the locking bodies 35a and 35b, and the locking bodies 35a and 35b are fixed to the ends of both side surfaces of the vertical plates 33a and 33b.

In the sorting device 31, the partition plates 32a and 32b have inclined plates 34a and 34b connected to the vertical plates 33a and 33b, respectively. It has a bellows body 46 and an inclined plate 44 connected so as to straddle.

The bellows body 46 is a member formed by folding a flexible member such as a canvas into a bellows shape, and one end thereof is connected to the lower side of the vertical plate 33a and the other end is connected to the lower side of the vertical plate 33b. .. The bellows body 46 follows the vertical plate 33a and / or the vertical plate 33b even if the vertical plate 33a and / or the vertical plate 33b moves left and right and the distance between the vertical plate 33a and the vertical plate 33b changes, and connects the vertical plate 33a and the vertical plate 33b. The bellows body 46 is attached so as to be inclined so that the sorting material 202 that has fallen on the bellows body 46 can be discharged.

The inclined plate 44 is a member for discharging the sorting material 202 that has fallen on the bellows body 46 to the outside of the gantry 51, and is attached so as to be inclined under the bellows body 46.

In the sorting device 31, the sorting items 202 that fall into the categories N and A via the inclined plates 34a and 34b of the partition plates 32a and 32b are discharged to the outside of the gantry 51, respectively, and the sorting items 202 that fall into the pedestal B are pedestals. Collect inside 51. On the other hand, in the sorting device 41, the sorting material 202 that falls into the category B via the bellows body 46 connecting the vertical plates 33a and 33b and the inclined plate 44 is discharged to the outside of the gantry 51 and dropped into the categories N and A. The sorted material 202 to be collected is collected inside the gantry 51.

The structure of the sorting devices 31 and 41 is different between the magnetic force sorting device 2 of the second embodiment of the present invention and the magnetic force sorting device 1 of the first embodiment of the present invention, and the collection position of the sorted object 202 is different accordingly. The sorting principle, sorting procedure, operation, and effect of the magnetic force sorting device 201 are the same in the magnetic force sorting device 2 and the magnetic force sorting device 1 of the first embodiment of the present invention.

The magnetic force sorting devices 1 and 2 of the first and second embodiments of the present invention both include two partition plates 32a, 32b, 42a and 42b, whereby the object to be sorted 201 can be divided into three categories. Further, since the positions of the two partition plates 32a, 32b, 42a and 42b can be moved left and right, the sizes of the division N, the division B and the division A can be easily changed. As described above, this makes it possible to obtain a selected product 202 having a desired particle size.

On the other hand, in the sorting devices 31 and 41 of the magnetic force sorting devices 1 and 2 of the first and second embodiments, the heights of the partition plates 32a, 32b, 42a and 42b are fixed and the heights are changed. Can't. Here, as a modification of the sorting devices 31 and 41 of the magnetic force sorting devices 1 and 2 of the first and second embodiments, if the heights of the partition plates 32a, 32b, 42a and 42b are variable, the heights can be changed. By changing the above, a selected product 202 having a desired particle size can be obtained. That is, the variable height structure of the partition plates 32a, 32b, 42a, 42b functions as a particle size variable mechanism capable of changing the particle size to be divided. This is also clear from FIGS. 8 and 9, equations (7) to (12).

As a method of changing the height of the partition plates 32a, 32b, 42a, 42b, a method of changing the installation height of the entire partition plates 32a, 32b, 42a, 42b, the vertical plates 33a, 33b have an elastic structure, and the vertical plates There is a method of changing only the heights of 33a and 33b. In the latter case, it suffices if the position of the uppermost end close to the rotating drum 11 can be changed. As the telescopic structure of the vertical plates 33a and 33b, for example, the vertical plates 33a and 33b may be composed of a plurality of plates so that they can be slidable. Such a method can be easily carried out by following the structure of the sorting devices 31 and 41 as it is. Further, by making the heights of the partition plates 32a, 32b, 42a, and 42b variable to the left and right, it is possible to more reliably obtain the selected product 202 having a desired particle size.

Further, the magnetic force sorting devices 1 and 2 of the first and second embodiments may modify the sorting devices 31 and 41 as follows. In the magnetic force sorting devices 1 and 2 of the first and second embodiments, two partition plates 32a, 32b, 42a, 42b are used for the sorting devices 31 and 41, whereby the object to be sorted 201 is divided into desired particle sizes. However, if it is a simpler sorting device, one partition plate may have a structure that can be changed left and right and / or up and down. Such a structure also functions as a particle size variable mechanism capable of changing the particle size for classifying. In the case of one partition plate, the number of divisions is two, but unlike the conventional sorting device with a fixed position, by changing the partition plate left and right and / or up and down, the properties of the object to be sorted 201 such as contaminated soil 201. Even if the above changes, it is possible to sort according to the change.

FIG. 12 is a side view showing a schematic configuration of the magnetic force sorting device 3 according to the third embodiment of the present invention. The same configurations as those of the magnetic force sorting apparatus 1 of the first embodiment shown in FIGS. 1 to 5 are designated by the same reference numerals, and the description thereof will be omitted.

The basic configuration of the magnetic force sorting device 3 of the third embodiment of the present invention is the same as that of the magnetic force sorting device 1 of the first embodiment of the present invention, but the structure of the sorting device 301 is different. Similar to the sorting device 31, the sorting device 301 is configured to classify the sorted items 202 falling from the discharge port 25 into a plurality of categories according to the falling position, and to further collect the sorted items 202.

The sorting device 301 is composed of six separate collection tanks 302, and like the sorting device 31, these are installed side by side under the discharge port 25 without any gaps. In the present embodiment, since the number of the separated collection tanks 302 is 6, the sorted material 202 can be separated and collected into 6 categories, but the number of the separated and collected tanks 302 is not limited to 6 and is divided into 6 categories. It suffices as long as it is equal to or more than the number of divisions. Preferably, the number of separate collection tanks 302 is 3 or more. This makes it possible to classify contaminants into desired concentrations.

The size (width) of each separate collection tank 302 is basically the same, but may be different. The size (width) of each separate collection tank 302 is not limited to a specific width, but it is finer if a narrower one is used in order to determine the particle size of the sorted matter 202 in which the width is divided. Can be classified. That is, in the magnetic force sorting device 3 of the present embodiment, the plurality of separate collection tanks 302 function as a particle size variable mechanism capable of changing the particle size to be divided.

Although the sorting device 301 of the magnetic force sorting device 3 has a simple configuration, the sorting object 202 can be reliably divided into a plurality of categories. Further, by appropriately setting the number of each separated collection tank 302 and the size (width) of each separated collection tank 302, the sorted product 202 having a desired particle size can be collected.

FIG. 13 is a side view showing a schematic configuration of the magnetic force sorting device 4 according to the fourth embodiment of the present invention. The same configurations as those of the magnetic force sorting device 1 of the first embodiment shown in FIGS. 1 to 5 and the magnetic force sorting device 3 of the third embodiment shown in FIG. 12 are designated by the same reference numerals and description thereof will be omitted.

The magnetic force sorting device 4 of the fourth embodiment of the present invention has the same basic configuration as the magnetic force sorting device 1 of the first embodiment of the present invention, and the structure of the sorting device 311 of the magnetic force sorting device 4 is the magnetic force sorting device 3. Similar to the sorting device 301. The sorting device 311 is common to the sorting device 301 in that the sorting object 202 falling from the discharge port 25 is divided into a plurality of categories according to the falling position and collected by using the sorting and collecting tank 302, but the sorting device 311 Further includes a mixing device 312 for mixing the sorted items 202 in the separated collection tank 302.

Since the separate collection tank 302 can be considered in the same manner as the sorting device 301 of the magnetic force sorting device 3, the description thereof will be omitted.

The mixing device 312 includes an outlet pipe 313 provided at the bottom of each sorting and collecting tank 302 for discharging the sorted material 202, and a collecting pipe 314 to which each outlet pipe 313 is connected and a mixing preparation tank 315 connected to the collecting pipe 314. .. Each outlet pipe 313 has a valve 316 in the middle of the pipe line, and the outlet portion is connected to the collecting pipe 314. The discharge of the sorted material 202 from the separated collection tank 302 may be due to gravity, but if a screw feeder or the like is provided in the separated collection tank 302 or the outlet pipe 313 to enable quantitative discharge, selection of desired properties is possible. A substance 202, for example, a contaminant having a predetermined concentration can be easily recovered.

The mixing preparation tank 315 is a tank that receives the sorting material 202 discharged from the collecting pipe 314. A caster 317 is installed at the bottom of the mixing preparation tank 315, and the entire sorting device 311 is integrally movable. The sorting device 311 of the present embodiment includes casters 317 and is configured to be movable, but may be a fixed type.

When the sorting device 311 is used, the sorting and collecting tank 302 is arranged below the discharge port 25 as in the sorting device 301, and the sorted items 202 are sorted and collected in the six sorted and collected tanks 302. The mixing operation of the sorted items 202 separated and collected in the separated and collected tank 302 may be performed while the sorted items 202 are separated and collected in the separated and collected tank 302, or may be performed after the sorted items 202 are separated and collected in the separated and collected tank 302. good. When the mixing operation is performed after the sorted items 202 are sorted and collected, the sorting device 311 may be moved to another place.

In the magnetic force sorting device 4 of the fourth embodiment, since the sorting device 311 includes a mixing device 312 capable of mixing the sorted and collected items 202 in addition to the separated and collected tank 302, the sorted items separated and collected via the mixing device 312. By mixing two or more kinds of 202, it is possible to easily recover a sorted product 202 having desired properties, for example, contaminated soil having a predetermined concentration. That is, in the magnetic force sorting device 4 of the present embodiment, the mixing device 312 functions as a particle size variable mechanism capable of changing the particle size to be divided. The configuration / structure of the mixing device 312 capable of mixing the sorted products 202 is not limited to this embodiment. Further, the mixing device 312 for mixing the sorting material 202 can be applied to the magnetic force sorting device of other embodiments.

14A and 14B are views showing a schematic configuration of a magnetic force sorting device 5 according to a fifth embodiment of the present invention, in which FIG. 14A is a side view and FIG. 14B is a schematic diagram for explaining the action and effect of the sorting device 321. be. The same configurations as those of the magnetic force sorting device 1 of the first embodiment shown in FIGS. 1 to 5 and the magnetic force sorting device 3 of the third embodiment shown in FIG. 12 are designated by the same reference numerals and description thereof will be omitted.

The magnetic force sorting device 5 of the fifth embodiment of the present invention has the same basic configuration as the magnetic force sorting device 1 of the first embodiment of the present invention, and the structure of the sorting device 321 of the magnetic force sorting device 5 is the magnetic force sorting device 3. Similar to the sorting device 301. The sorting device 321 is common to the sorting device 301 in that the sorting device 202 that falls from the discharge port 25 is sorted into a plurality of categories according to the falling position and collected by using the sorting and collecting tank 302, but the sorting device 321 Further includes a height variable device 322 capable of changing the installation height of the separated collection tank 302.

Since the separate collection tank 302 can be considered in the same manner as the sorting device 301 of the magnetic force sorting device 3, the description thereof will be omitted.

The height variable device 322 has a lifter 323 with casters, and is provided with a support plate 324 for supporting the separated collection tank 302 at the upper part. The separate collection tanks 302 are placed side by side on the support plate 324 without any gaps. In this embodiment, a lifter 323 with casters is used, but a fixed lifter may be used.

The method of using the magnetic force sorting device 5 is basically the same as that of the magnetic force sorting device 3 of the third embodiment. Sorting can be done more easily. That is, in the magnetic force sorting device 5 of the present embodiment, the height variable device 322 that can change the installation height of the separate collection tank 302 functions as a particle size variable mechanism that can change the particle size to be divided.

The estimated trajectories of the particles emitted away from the rotating drum 11 are as shown in FIGS. 7 to 9 and equations (7) to (12) and 14 (B). Of the estimated particle trajectories shown in FIG. 14B, the rightmost locus assumes the case where the particles slide and fall on the rotating drum 11. This point is the same in FIGS. 12 and 13.

The horizontal trajectory of the particles differs depending on the distance from the discharge port 25, and the farther the distance (height direction) is from the discharge port 25, based on the right end of the rotating drum 11 (A in FIG. 14B). , The particles move to the left side, and the spatial distribution width of the particle size widens. Therefore, as shown in FIG. 14B, the closer the position of the separate collection tank 302 is to the rotary drum 11, the smaller the number of divisions. On the contrary, the farther the position of the separate collection tank 302 is from the rotary drum 11, the larger the number of divisions can be divided, and the smaller the particle size of the sorted object 202 can be collected.

The height variable device 322 can be applied not only to the sorting device 321 of the present embodiment, but also to the sorting device of another embodiment and the sorting device 311 including the mixing device 312 shown in the fourth embodiment.

FIG. 15 is a diagram showing a schematic configuration of a magnetic force sorting device 6 according to a sixth embodiment of the present invention. The same configurations as those of the magnetic force sorting apparatus 1 of the first embodiment shown in FIGS. 1 to 5 are designated by the same reference numerals, and the description thereof will be omitted. Of the objects to be sorted 201 and the objects to be sorted 202, the fine particles have a slow settling speed after being separated from the rotating drum 11 and being discharged into the space, and are easily affected by the wind. Since such fine particles have a high contamination concentration, it is not preferable to mix them in the separate collection tank 38 for collecting the sorted material 202 having a low contamination concentration and a large particle size. The magnetic force sorting device 6 of the sixth embodiment is designed to solve this problem.

The magnetic force sorting device 6 includes a casing 331 that covers and accommodates the magnetic force sorting device main body in addition to the magnetic force sorting device main body, and a space inside the casing 331 in the process of discharging the sorted material 202 from the discharge port 25 and collecting it in the sorting recovery tank 38. It is provided with a dust collector 351 that sucks and collects the sorted material 202 floating in the casing. In the present embodiment, the magnetic force sorting device 1 of the first embodiment is used as the magnetic force sorting device main body, but the magnetic force sorting device main body may be the magnetic force sorting device of another embodiment.

In the present embodiment, the casing 331 covers and accommodates the main body of the magnetic force sorting device, but at least the sorting port 25 and the discharging port 25 and the casing 331 are prevented from being scattered to the surroundings in the process of being discharged from the discharging port 25 and collected in the separated collection tank 38. The sorting device 31 may be covered. The same applies when the magnetic force sorting device of another embodiment is used.

An intake duct 352 of the dust collector 351 is provided on one side wall of the casing 331. The suction port 353 of the intake duct 352 is arranged on the side wall side near the separated collection tank 38 for collecting the sorted material 202 having a small particle size, and the air in the casing 331 is collected in the separated collection tank 202 having a fine particle size. It is better to suck in the 38 side direction. As a result, even when the sorted product 202 suspended in the suction process is settled, the sorted product 202 is preferable because it is not mixed in the separated collection tank 38 for collecting the sorted product 202 having a low contamination concentration and a large particle size.

The dust collector 351 is a device that sucks and collects the sorted material 202 floating in the casing 331, and has an intake duct 352 having one end attached to the side wall of the casing 331, and a dust collector fan 354 arranged in the intake duct 352. It is installed on the wake side of the dust collecting fan 354 and includes a dust collecting magnet 355 that attracts the selected material 202 in the sucked air, a demagnetized dust collecting box 356, a HEPA filter 357, and the like. However, the configuration of the dust collector 351 is not limited to this, and it is sufficient that the sorted material 202 floating in the space inside the casing 331 can be sucked and collected so as not to affect the sorted product 202 during the magnetic separation classification.

The dust collecting fan 354 takes in air slowly so that the air flow does not affect the sorted material 202 during the magnetic separation classification. As the dust collecting magnet 355, a sanitary magnet or the like can be used, and either a permanent magnet or an electromagnet may be used. In the case of a permanent magnet, the surface of the magnet or the yoke connected to the magnet can be mechanically brought into close contact with and separated from the dust collecting surface.

The dust collecting magnet 355 is installed on an inclined surface in the intake duct 352, and the demagnetized dust collecting box 356 is arranged below the inclined surface. After the sorting material 202 is attracted to the surface of the magnet housing, the magnetic field on the surface of the magnet housing is cut off by mechanical separation in the case of a permanent magnet and by blocking the energizing current in the case of an electromagnet, and the adsorbed sorting material 202 is removed. It flows down to the magnetic dust box 356 and is collected.

The HEPA filter 357 is installed at the last flow end of the intake duct 352, and a blower (not shown) is connected to ensure a working environment and safety. A bag filter may be used instead of the HEPA filter 357. By providing the casing 331 and the dust collector 351 as described above, it is possible to prevent the fine particles from being affected by the wind and being mixed into the separate collection tank 38 for collecting the sorted material 202 having a low contamination concentration and a large particle size. Can be done. It is also possible to ensure the working environment and safety.

FIG. 16 is a schematic configuration diagram of the pollutant dry treatment system 101 according to the seventh embodiment of the present invention, and FIG. 17 illustrates the structure of the sorter ejector 81 provided in the magnetic force sorting device 7 of the pollutant dry treatment system 101. It is a figure to do. The same components as those of the magnetic force sorting apparatus 1 of the first embodiment shown in FIGS. 1 to 5 are designated by the same reference numerals, and the description thereof will be omitted.

The pollutant dry treatment system 101 is a dry continuous treatment system for classifying raw soil contaminated with radioactive substances according to the concentration of radioactive substances, and has the same configuration as the magnetic force sorting device 1 shown in FIG. The apparatus 7 includes a kneader 103 that continuously kneads raw soil and a radioactive powder, an iron powder feeder (see FIG. 18) that supplies a fixed amount of radioactive powder to the kneader 103, a transfer device, and the like.

The magnetic force sorting device 7 incorporated in the pollutant dry processing system 101 has the same basic configuration as the magnetic force sorting device 1 shown in FIG. 1, but the configuration around the sorting device 31 is different. In the magnetic force sorting device 7, an electric cylinder 37 for moving the partition plates 32a and 32b to the left and right is mounted, and the partition plates 32a and 32b can be variably configured to the left and right via the electric cylinder 37. Further, a sorter discharger 81 is provided at the tip of the inclined plates 34a and 34b of the partition plates 32a and 32b.

17 (A) is a partial cross-sectional view of the sorted product ejector 81 in a plan view, FIG. 17 (B) is a side sectional view of the sorted product ejector 81, and FIG. 17 (C) is a comparative example of the sorted product. A partial cross-sectional view of the ejector in a plan view, FIG. 17 (D) is a side sectional view of the sorted product ejector as a comparative example.

As shown in FIG. 17A, the sorter ejector 81 is composed of three rectangular parallelepiped shaped boxes 82 corresponding to the categories A, B, and N, and each box 82 is directed toward the discharge port 84. An inclined chute 83 is provided. The discharge port 84 has a roughly rectangular parallelepiped shape, and is provided at the end of the box 82 so that the inlet hole 85 is connected to the tip of the chute 83. The discharge port 84 is provided with a discharge hole 89 in the bottom plate 86, from which the sorted material 202 enters the separated collection tank 38.

The bottom plate 86 of the discharge port is attached so that the base end portion 87 is connected to the tip of the chute 83, and the inclination angle θ _o of the bottom plate 86 is set to be the same as or larger than the inclination angle θ _s of the chute 83. Further, the discharge port 84 is provided with an inclined plate 90 on the tip end side of the bottom plate 86. This prevents the sorting material 202 from accumulating on the discharge port 84 and the chute 83 shown in the comparative examples of FIGS. 17 (C) and 17 (D).

As shown in the comparative example of FIG. 17D, when the bottom plate 86 of the discharge port 84 is installed horizontally, the angle of the connecting portion between the chute 83 and the bottom plate 86 changes abruptly, so that the sorted material 202 is placed there. Easy to deposit. If the sorting material 202 is deposited on this portion, the sorting material 202 is deposited on the lower part of the chute 83 and further on the entire chute 83 due to long-term operation, and there is a risk of overflow. Further, in the comparative example, since the inclined plate 90 is not provided, the sorting material 202 is deposited at the corner of the discharge port 84.

The overall configuration and treatment flow of the pollutant dry treatment system 101 are as follows.

The gravel and dust shells are removed with a vibrating sieve or the like, and the raw soil that has been air-dried in the sun is temporarily stored in the raw soil hopper 111 and then provided on the upper part of the kneader 103 via the soil transfer device 113. It is sent to the hopper 105 on the kneader with the vibrator. The kneader 103 is a horizontal two-axis paddle mixer, and screws are attached to the vicinity of the supply port and the discharge port in place of the paddle.

Raw soil is supplied to the kneader 103 from the hopper 105 on the kneader, and magnetite powder is supplied from the iron powder feeder 108 (see FIG. 18). After these are mixed, the kneader is provided at the kneader discharge port 104. It is sent to the lower hopper 106. The mixture of the raw soil and the magnetite powder mixed by the kneader 103 is the object to be sorted 201.

The lower hopper 106 of the kneader is connected to the sorted object transfer device 115 for transferring the sorted object 201 to the sorted object hopper 77 provided in the upper part of the magnetic force sorting device 7, and is connected to the sorted object transfer device 115 via the sorted object transfer device 115. The object to be sorted 201 is transferred to the object to be sorted hopper 77.

The object to be sorted 201 in the object to be sorted hopper 77 is sent to the magnetic force sorting device 7 via the vibration feeder 71, and the object to be sorted 201 is classified into three categories according to the particle size.

In the pollutant dry treatment system 101, a tube conveyor can be suitably used for the soil transfer device 113. The tube conveyor is provided with a helical coil in the tube, and the raw soil is conveyed by the rotation of the helical coil. At this time, the secondary particles of the raw soil bonded by moisture, static electricity, etc. are crushed by the helical coil rotating in the tube, and the surface of the raw soil is polished into fine particles. This enables classification according to the particle size.

The magnetic force sorting device that can be used in the contaminant dry treatment system 101 is not limited to the magnetic force sorting device 7 shown in the present embodiment, and any one of the magnetic force sorting devices shown in the first to sixth embodiments is used. can do. Further, in the present pollutant dry treatment system 101, the pollutant is the soil contaminated with the radioactive substance, but the pollutant is not limited to the soil contaminated with the radioactive substance.

FIG. 18 is a block diagram of the pollutant dry treatment system 102 according to the eighth embodiment of the present invention and a layout diagram of devices / equipment. The same components as those of the pollutant dry treatment system 101 of the seventh embodiment of the present invention shown in FIG. 16 are designated by the same reference numerals and the description thereof will be omitted.

The pollutant dry treatment system 102 of the eighth embodiment is also a dry continuous treatment system for classifying the pollutant-contaminated soil (raw soil) according to the concentration of the radioactive substance, like the pollutant dry treatment system 101 of the seventh embodiment. The basic configuration is also almost the same as that of the pollutant dry treatment system 101. On the other hand, the pollutant dry treatment system 102 is an in-vehicle system that can be installed on the truck bed, and the layout of the devices / devices is devised.

The pollutant dry treatment system 102 is a pretreatment device that performs a pretreatment step of removing gravel, dust, etc. from the raw soil and further drying, etc., and a magnetic material powder is added to and mixed with the raw soil obtained by the pretreatment treatment. However, it is roughly classified into a magnetic separation classifying device that executes a magnetic separation classifying process that classifies this by magnetic force sorting, and a control device that controls operation.

The pretreatment device is a device that removes gravel, debris, etc. from the raw soil and further dries, etc., and is a crushing device 121, a first vibrating sieve 131 installed upstream of the crushing device 121, and a crushing device 121. It has a soil transfer device 113 provided at the outlet portion of the above, and a second vibrating sieve 141 installed downstream of the soil transfer device 113. The pretreatment device has a size that can be mounted on the loading platform of a small truck, and in the case of a medium-sized truck, it has a size that occupies about 20% to 30% of the loading platform 401.

The crushing device 121 is a device for crushing and drying the raw soil from which gravel and debris have been removed, which is supplied by the first vibrating sieve 131. The crushing device 121 has a stirring tank 123 with a jacket, a paddle type stirring tank 122 is mounted in the stirring tank 123, and a heater 126 is mounted in the jacket.

The jacket is filled with a heat medium, and the heat medium is heated by the heater 126 to dry the raw soil in the stirring tank 123. The stirring tank 123 is provided with a discharge port (not shown) for discharging steam to the outside. A heat pump 127 is connected to the heater 126.

The first vibrating sieve 131 has a mesh size of about 20 to 50 mm, is provided with an upper sieving hopper 133 for receiving raw soil contaminated with radioactive substances at the upper part, and a lower sieving hopper 135 at the lower part. The stirring tank 123 of 121 is connected via a conduit. The first vibrating sieve 131 is installed upstream of the crushing device 121, removes gravel and trash shells from the raw soil, and supplies the raw soil from which the gravel and trash shells have been removed to the crushing device 121.

A belt conveyor, which is a soil transfer device 113, is installed at the discharge port 125 of the crushing device 121, and the raw soil crushed and dried by the crushing device 121 is sent to the second vibrating sieve 141.

The second vibrating sieve 141 has a sieve mesh of about 2 to 5 mm, is provided with a sub-sieve hopper 143 at the bottom, and the sub-sieve hopper 143 and the kneader 103 communicate with each other via a conduit and are sent from the crushing device 121. Further, gravel and trash shells are removed from the raw soil and supplied to the kneader 103.

The magnetic separation classification device is a device in which gravel and trash shells are removed by a pretreatment device, and then crushed and dried raw soil and magnetite powder are mixed, and the magnetic separation is performed to classify them into three categories according to the particle size. , A kneader 103 for mixing raw soil and magnetite powder, a belt conveyor which is an object transfer device 115, and a magnetic separation device 7. The magnetic separation classification device has a size that can be mounted on the loading platform of a small truck, and if it is a medium-sized truck, it occupies about 20% to 30% of the loading platform 401.

The magnetic force sorting device 7 used in the present embodiment uses a flexible container bag for the sorting and collecting tank 38, but the basic configuration is the same as the magnetic force sorting device 7 used in the pollutant dry treatment system 101 of the seventh embodiment. ..

The control device 161 controls the operation of each device / device of the pollutant dry treatment system 102. As a result, the pollutant dry treatment system 102 can be operated so that the radioactively contaminated soil can be sorted and recovered by the particle size according to a predetermined treatment procedure.

The arrangement of the apparatus / equipment of the pollutant dry treatment system 102 will be described. In the pretreatment device, the first vibrating sieve 131, the crushing device 121, the belt conveyor 113, and the second vibrating sieve 141 are arranged in a straight line. Further, the coarse-sized storage tank 151 for storing the gravel and the waste shell discharged from the first vibrating sieve 131 is located upstream of the first vibrating sieve 131, and the gravel discharged from the second vibrating sieve 141 and the coarse-sized waste shell are stored. The distribution tank 151 is arranged on the downstream side of the second vibrating sieve 141. The bulky storage tank 151 is also arranged on a straight line of the pretreatment device.

In the magnetic separation classification device, the belt conveyor 115 and the magnetic force sorting device 7 are arranged in a straight line and parallel to the pretreatment device. The kneading machine 103 is arranged so as to connect the pretreatment device and the magnetic separation classifying device so as to be orthogonal to the pretreatment device and the magnetic separation classifying device.

The treatment procedure of the pollutant dry treatment system 102 is shown. The raw soil is supplied to the sieving hopper 133 of the first vibrating sieve 131 by hand or by a machine such as a mini backhoe, where gravel, garbage shells and the like are removed. The gravel, garbage shell, etc. fall from the chute 153 to the bulky storage tank 151. The raw soil from which gravel, garbage shells and the like have been removed is crushed and dried by the crushing device 121, and then sent from the belt conveyor 113 to the second vibrating sieve 141.

The raw soil from which gravel, waste shells, etc. have been further removed by the second vibrating sieve 141 is mixed with the magnetite powder supplied from the iron powder feeder 108 by the kneader 103, and sent to the magnetic force sorting device 7 by the belt conveyor 115 3 Sorted into categories.

Since the pollutant dry treatment system 102 consisting of the above can be mounted on one or two vehicles, the decontaminated soil buried in the temporary storage area such as the garden of a general house is classified and reduced in volume locally. Suitable for. Specifically, small contaminated soil such as decontaminated soil buried in the garden, etc. is removed on the spot, and pretreatment such as drying and crushing is performed, and magnetic separation is performed to classify the large particle size. The classified low-concentration soil can be used as the on-site backfill material.

This will reduce the amount of backfill soil that must be procured by cutting down healthy mountains, reduce the destruction of the natural environment, and reduce the amount of decontaminated soil transferred during transportation. It also contributes to the reduction of environmental load, such as the control of the spread of secondary pollution and the control of carbon dioxide emissions associated with the reduction of fossil fuel consumption.

As described above, as shown in the magnetic force sorting devices of the first to sixth embodiments, the magnetic force sorting device of the present invention is provided with a position variable mechanism capable of changing the position of the magnet portion of the rotating drum, and the sorting device is further divided. Since it is equipped with a particle size variable mechanism that can change the particle size, it is possible to separate the particles according to the concentration of the contaminants. Since the particle size variable mechanism has a simple structure, a magnetic force sorting device provided with such a particle size variable mechanism is practical and easy to use.

Further, the magnetic force sorting device of the present invention can exhibit excellent classification performance because the supply device for supplying the sorted object is provided with a thinning means for thinning the sorted object. Further, since the thinning means has a simple structure, it can be easily applied to an existing supply device.

The magnetic force sorting device of the present invention has operating conditions such as the supply speed of the object to be sorted, the rotational speed of the rotating drum, the position of the magnet with respect to the rotating drum of the magnetic separator, the device characteristics such as the magnetic flux density on the surface of the rotating drum, and the water content of the object to be sorted. Since it is possible to change the magnetic flux characteristics of the object to be sorted, such as the rate, it is possible to perform the desired classification by adjusting this.

The magnetic force sorting apparatus of the present invention can be widely used because the contaminants in the form of powder or granular material are used as the object to be sorted. Efficient decontamination and volume reduction can be realized by using the radioactive material-contaminated soil as the object to be sorted and treating it using the magnetic force sorting device and the pollutant dry treatment system of the present invention.

A suitable magnetic force sorting device, a method of using the magnetic force sorting device, and a pollutant dry treatment system have been described with reference to the drawings. It would be easy to assume a fix. Therefore, such changes and amendments are construed as being within the scope of the invention as defined by the claims.

Discharge layer thickness reduction device: Triangular tooth effect confirmation test Dry decomposed granite soil (moisture content less than 0.5 wt%) 2 mm mesh A test piece with 0.5 wt% of magnetic iron powder for passing through a sieve is used as the first specimen. A sorting experiment was performed using the magnetic force sorting device 1 shown in the embodiment. The diameter of the rotating drum 11 was 300 mm, the width was 300 mm, the surface magnetic flux density was 3,000 G, and the peripheral speed was 28.2 m / min. The rotation direction of the rotating drum 11 is clockwise. The inclination angle θ ₁ of the magnet portion 18 of the rotating drum 11 is 0 °.

FIG. 19 shows the positions and divisions of the partition plates 32a and 32b. The positions of the partition plates 32a and 32b in the left-right direction are such that the position of the vertical plate 33b is directly below the center point of the rotary drum 11 and the position of the vertical plate 33a is from the center point of the rotary drum 11 with respect to the center point of the rotary drum 11. It was set to 120 mm on the right. The positions of the upper ends of the vertical plates 33a and 33b were set to ΔH = 40 mm from the lower end of the rotary drum 11.

Category A is a magnetized category mainly composed of small particle sizes. The category B sandwiched between the vertical plate 33a and the vertical plate 33b is a magnetized category mainly composed of a medium particle size. Category N is a non-arrival category mainly composed of large particle sizes. Hereinafter, the partition plate that separates the division A and the division B is referred to as a small particle size side partition, and the partition plate that separates the division B and the division N is referred to as a large particle size side partition.

In this experiment, the supply speed (processing speed) of the specimen was set to 385 to 1,300 kg / h when the triangular tooth-shaped plate 74 was attached to the trough tip 73 of the vibration feeder 71 and when it was not attached. , Confirmed the classification status. When the triangular tooth-shaped plate 74 is not attached, the trough tip 73 of the vibration feeder 71 is straight and flat, and is hereinafter referred to as flat teeth. Each category was classified by a sieve for civil engineering test having an opening of 106, 212, 425, and 850 μm, and evaluated.

FIGS. 20 to 22 show the relationship between the supply rate of the specimen and the mass ratio of the particle size range in each magnetizing category (the raw soil before treatment is 100%).

Regarding Category A, in the case of flat teeth, the mass ratios of 0 to 106 μm, 0 to 212 μm, and 0 to 425 μm had little change with respect to the supply rate, and the mass ratio was 1.1 wt% or less. .. On the other hand, in the case of triangular teeth, the mass ratio in any range tended to increase monotonically with respect to the supply rate. This suggests that the separation between particles progresses as the supply rate increases, and it can be seen that the higher the supply rate, the better the triangular teeth work.

In Category B, the mass ratios of particle size 0 to 212 μm and 0 to 425 μm monotonically increased with respect to the supply rate for both flat teeth and triangular teeth. From that trend, in the range of supply speed of 500 to 1,000 kg / h, the particle size of 0 to 425 μm is 8 to 10 wt% for flat teeth and 10 to 12 wt% for triangular teeth, and the latter is more common, and the particle size is 0 to 212 μm. The ratio of flat teeth is 7 to 8 wt%, while that of triangular teeth is 9 to 10 wt%, and the latter is more common. The particle size of 0 to 106 μm decreases monotonically in both cases, but the latter is particularly remarkable. It is considered that this is because the larger the supply amount, the larger the movement of the fine particles from the category B to the category A.

In categories A + B, the mass ratios of 0 to 212 μm and 0 to 425 μm of particle size increased monotonically with respect to the supply rate for both flat teeth and triangular teeth, but the latter was more remarkable, and the particle size of 0 to 106 μm was flat. Teeth were flat and triangular teeth tended to increase slightly. When the particle size is 0 to 425 μm in the supply speed range of 500 to 1,000 kg / h, the flat tooth is 9 to 11 wt%, while the triangular tooth is 10 to 14 wt% and the particle size is 0 to 212 μm, the flat tooth is 8 to 9 wt%. The percentage of triangular teeth is 10 to 11 wt%, and the latter is more common.

Based on the above, those with triangular teeth added to recover relatively small particles with a particle size of 0 to 425 μm as total magnetic deposition A + B and to concentrate fine particles with a particle size of 0 to 106 μm as Category A. Is efficient, and can be said to be particularly effective when the supply speed is high.

Pollutant dry treatment system test A sorting test was conducted using the same equipment as the pollutant dry treatment system 101 shown in FIGS. 16 and 17. A tube type conveyor (TS-10 type manufactured by Nippon Kosan Co., Ltd.) was used for the soil transfer device 113 and the object transfer device 115.

On-site raw soil (moisture content of 4.7 wt% or more) is used as contaminated soil, 0.2 wt% of magnetic iron powder is added to it, the processing speed is 1,000 kg / h, and the surface magnetic flux density of the rotating drum 11 is 5. The test was conducted at 000 G and a drum peripheral speed of 71 m / min. The diameter of the rotary drum 11 is 300 mm, the width is 300 mm, and the inclination angle θ ₁ of the magnet portion 18 of the rotary drum 11 is 12 °. Further, a triangular tooth-shaped plate material 74 was attached to the trough tip 73 of the vibration feeder 71.

FIG. 23 shows the partition position on the small particle size side and the partition position on the large particle size side. FIG. 23 is a view of the rotating drum 11 as viewed from the back side, and the direction of rotation is counterclockwise because the direction of viewing is opposite to that of the rotating drum 11 of FIG. The small particle size side partition position is 52 mm (horizontal direction) from the center point of the rotating drum, ΔH2 = 150 mm from the lower end of the rotating drum 11, and the large particle size side partition position is -150 mm (horizontal direction) from the rotating drum center point. ΔH1 = 50 mm from the lower end of the drum 11.

The particle size distribution and the radioactivity concentration distribution of the field raw soil are shown in FIG. 24. The radioactivity concentration is a value obtained by radiation spectroscopic analysis with a germanium detector. The smaller the particle size, the higher the radioactivity concentration. The overall average value (overall average) of the radioactivity concentration in the field raw soil was 42,600 Bq / kg.

FIG. 25 shows the classification results. In FIG. 25, the experimental data is plotted at positions of 53 μm for the 106 μm subsieving component, 159 μm for the 106 to 212 μm component, 318.5 μm for the 212 to 425 μm component, 637.5 μm for the 425 to 850 μm component, and 1425 μm for the 850 to 2000 μm component. (Average value of the opening between each adjacent sieve). This also applies to the following figures.

The mass ratio (overall) after classification is Category A (small particle size): Category B (medium particle size): Category N (large particle size) = 1: 43: 56, and the radioactivity concentration ratio is When the overall average value of 42,600 Bq / kg of the raw soil is set to 1 and the concentration after treatment is standardized and shown, it is Category A: Category B: Category N = 2.21: 1.52: 0.62. rice field. Based on the above, if the amount classified from the raw soil into the low concentration category N is defined as the mass loss rate, the mass loss rate is 56%, and the raw soil of 12,900 Bq / kg is reduced to less than 8,000 Bq / kg, 4 It is predicted that 800 Bq / kg of raw soil can be obtained as a low concentration to less than 3,000 Bq / kg.

Further, as shown in FIG. 25, when the on-site raw soil and the category A + B + N, which is the sum of the soils divided into each category, are compared, the latter has a decrease in soil having a particle size of 600 μm or more, and conversely, a soil having a particle size of 600 μm or less. It can be seen that the soil is increasing. This means that in the soil transfer device 113 and the object transfer device 115, the swirling helical coil collides with the soil particles and the soil particles, so that the small particle size adhering to the large particle size surface is crushed and separated. It can also be said that it suggests that the surface with a large particle size was ground.

FIG. 26 shows the particle size distribution when a tubular conveyor (TS-10 type manufactured by Nippon Kosan Co., Ltd.) is used for the soil transfer device 113 and the decomposed granite soil (moisture content is less than 0.5 wt%) is passed through. Decomposed granite soil contains a large amount of high-hardness quartz and feldspar, and is expected to be difficult to polish. It can be seen that the decomposed granite soil is increasing.

Operating condition comparison test using simulated raw soil (drum peripheral speed)
Similar to the triangular tooth effect confirmation test, a sorting experiment was performed using the magnetic force sorting device 1 shown in the first embodiment. For the specimen, the simulated raw soil obtained as follows was used. Commercially available decomposed granite soil, black soil, and rice soil were mixed in a mass ratio of decomposed granite soil: black soil: rice soil = 86: 7: 7, and then passed through a 2 mm sieve, and the passed material was used. The moisture content of the simulated raw soil is less than 1.4 wt%.

0.2 wt% of magnetic iron powder was added to the simulated raw soil, the processing speed was 2,200 kg / h, the peripheral speed of the rotating drum 11 was 56,71,87 m / min, and the inclination angle θ of the magnet portion 18 of the rotating drum was θ. The test was performed with ₁ set to 12 °. The diameter of the rotary drum 11 is 300 mm, the width is 300 mm, and the surface magnetic flux density of the rotary drum 11 is 5,000 G. Further, a triangular tooth-shaped plate material 74 was attached to the trough tip 73 of the vibration feeder 71.

The partition position on the small particle size side is 6 mm (horizontal direction) from the center point of the rotating drum in FIG. 23, ΔH2 = 135 mm from the lower end of the rotating drum 11, and the partition position on the large particle size side is -150 mm from the center point of the rotating drum in FIG. (Horizontal direction), ΔH1 = 50 mm from the lower end of the rotating drum 11. The rotation direction of the rotating drum 11 is counterclockwise in FIG. 23.

It is considered that the following effects are produced by increasing the peripheral speed of the rotating drum 11.
(1-1) Advantageous for classification by particle size classification: Since the amount of soil particles settled in the unit cross-sectional area of the rotating drum is reduced, the soil particles are widely dispersed on the rotating drum, and the separation of the particles is promoted.
(1-2) Advantageous for classification by particle size classification: Since the relative velocity between the rotating drum and the soil particles settling on the rotating drum increases, the separation of the particles by crushing is promoted.
(1-3) Medium to large particle size desorbs at an early stage: Since the centrifugal force (force to peel off from the rotating drum) received by the soil particles adhering to the rotating drum increases, the soil particles with insufficient magnetic force can be removed. The timing of detaching from the drum surface is earlier. In addition, soil particles with sufficient magnetic force are projected farther from the rotating drum in order to obtain a large horizontal velocity by increasing the peripheral velocity.

The mass ratio distribution is shown in FIGS. 27 to 29. In the figure, categories A + B indicate the magnetized component, and the mass ratio of this is called the magnetized component. Here, the magnetized component is a particle size component that does not desorb immediately after being settled on the rotating drum 11. The relationship between the peripheral speed of the rotating drum 11 and the magnetizing rate is as shown in Table 1, and the magnetizing rate increases as the peripheral speed decreases. This seems to be mainly due to the effect of (1-3) above.

Looking at the relationship between the peripheral speed of the rotating drum 11 and the distribution of the mass ratios of the categories A, B, and A + B, the case of 87 m / min, which has the fastest peripheral speed, shifts to the smallest particle size side. It seems that this is mainly due to the effects of (1-1) and (1-2) above.

Focusing on the mass ratio of 0 to 212 μm for the magnetized component (Category A + B) (fine particle size magnetic collection collection rate, 100 wt% of the sample simulated raw soil), as shown in Table 1, the rotating drum 11 The slower the peripheral speed, the higher the fine particle polarization collection rate.

From the above results, in order to collect more fine particles and reduce the radioactivity concentration (concentration ratio) of Category N, which is a low concentration component, it is better to have a slower peripheral speed, and Category A + B, which is a high concentration component. In order to increase the radioactivity concentration (concentration ratio) and reduce it, the faster the peripheral speed is, the better. Depending on the situation at the site, it is presumed that there may be cases where it is desirable to reduce the concentration ratio as much as possible in order to recycle the low concentration content as civil engineering construction soil, or to reduce the weight as much as possible because the management cost is high for the high concentration content. It is possible to flexibly respond to these demands by appropriately changing the drum peripheral speed according to the demands of the site.

Operating condition comparison test using simulated raw soil (partition position on the large particle size side)
A sorting experiment was conducted by changing the partition position on the large particle size side in the same manner as in the operating condition comparison test (drum peripheral speed) using simulated raw soil. The peripheral speed of the rotating drum 11 was 71 m / min, and the small particle size side partition position and the large particle size side partition position were set as follows. Other conditions are the same as the operating condition comparison test (drum peripheral speed) using simulated raw soil.

The partition position on the small particle size side is 6 mm (horizontal direction) from the center point of the rotating drum in FIG. 23, ΔH2 = 135 mm from the lower end of the rotating drum 11, and the partition position on the large particle size side is −150 mm from the center point of the rotating drum in FIG. 24. , -100 mm and -60 mm (horizontal direction). The height of the partition on the large particle size side was set to ΔH1 = 50 mm from the lower end of the rotary drum 11.

The following is expected due to the change in the partition position on the large particle size side.
(2-1) The closer the partition position on the large particle size side is to the horizontal center position of the drum, 0 mm, the more the mass ratio (overall) of the low concentration N increases, and the proportion of the small and medium particle size in it increases. do.
(2-2) Contrary to (2-1), the closer the partition position on the large particle size side is to the horizontal center position of the drum, the closer the mass ratio (overall) of the medium particle size category B is, and the more the mass ratio (overall) of the medium particle size category B decreases. The proportion of large particle size components occupying is reduced.

FIG. 30 shows the change in mass ratio (overall: whole grain size band) due to the change in the partition position on the large particle size side. As the partition position on the large particle size side is closer to the horizontal center position 0 mm of the rotating drum 11, the mass ratio (overall) of the low concentration N increases, and the mass ratio (overall) of the medium particle size category B and the category A + B increases. Diminished. It seems that this is mainly due to the effects of (2-1) and (2-2) above.

The mass ratio distribution is shown in FIGS. 31 to 33. Looking at the distributions of Category A, Category B, and Category A + B, the closer the partition position on the large particle size side is to the horizontal center position 0 mm of the rotating drum 11, the smaller the particle size shifts to the smaller particle size side, and the magnetizing rate decreases. Looking at the distribution of the category N, the closer the partition position on the large particle size side was to the horizontal center position 0 mm of the rotating drum 11, the more the proportion of the small and medium particle size components in the partition increased. It is considered that this is mainly due to the effects of (2-1) and (2-2) above.

The closer the partition position on the large particle size side is to the horizontal center position of the rotating drum 11 to 0 mm, the smaller the large particle size component in the distribution of category N. It is probable that the crushing proceeded because the soil particles to be classified collided with the partition plate 32a and were bounced off and settled in the situation where the horizontal velocity component became large.

Focusing on the mass ratio (fine particle size distribution collection rate) of 0 to 212 μm, which has a relatively high contamination concentration, regarding the magnetized component (Category A + B), the relationship between the large particle size side partition position and the fine particle size magnetism collection rate. Is shown in Table 2. The closer the partition position on the large particle size side was to the horizontal center position of the rotary drum 11 to 0 mm, the lower the fine particle polarization collection rate.

The closer the partition position on the large particle size side is to the horizontal center position 0 mm of the rotating drum 11, the more the distribution of the magnetically deposited component shifts to the smaller particle size side. In order to collect more fine particles and reduce the radioactivity concentration (concentration ratio) of the low concentration category N, it is better that the partition position on the large particle size side is far from the horizontal center position 0 mm of the rotating drum 11. .. In order to increase the radioactivity concentration (concentration ratio) of the category A + B, which is a high concentration component, and to reduce the concentration, it is better that the partition position on the large particle size side is closer to the horizontal center position 0 mm of the rotating drum 11.

Depending on the situation at the site, it is presumed that there may be cases where it is desired to reduce the concentration ratio as much as possible in order to recycle the low concentration content as civil engineering construction soil, or to reduce the weight as much as possible because the management cost is high for the high concentration content. It is possible to flexibly meet these demands by appropriately changing the partition position on the large particle size side according to the demands of the site.

FIG. 34 shows a graph in which category B, which is greatly affected by the mass ratio distribution due to the partition position on the large particle size side, is normalized by the mode of the distribution (mode normalized mass ratio). As the partition position on the large particle size side approaches the horizontal center position 0 mm of the rotating drum 11, the standardized particle size distribution shifts to the small particle size side. Here, the particle size having the mode value of 0.8 is defined as d ₈₀ , the particle size having 0.2 is defined as d ₂₀ , and these are referred to as the classification index particle size (B). Although there are two d ₈₀ points on each curve, the value on the large particle size side is adopted. This is shown in FIG. The classification index particle size (B) decreased as the partition position on the large particle size side was closer to the horizontal center position 0 mm of the rotary drum 11.

Operating condition comparison test using simulated raw soil (partition position on the small particle size side)
A sorting experiment was conducted by changing the partition position on the small particle size side in the same manner as in the operation condition comparison test (partition position on the large particle size side) using simulated raw soil. The partition position on the small particle size side and the partition position on the large particle size side were set as follows. Other conditions are the same as the operating condition comparison test (large particle size side partition position) using simulated raw soil.

The processing speed was set to about 400, 600, and 2,200 kg / h, and the inclination angle θ ₁ of the magnet portion 18 of the rotating drum 11 was set to 0 °. Further, the trough tip 73 of the vibration feeder 71 is equipped with a triangular tooth-shaped plate member 74. The small particle size side partition position and the large particle size side partition position were set as follows. Other conditions are the same as the operating condition comparison test (large particle size side partition position) using simulated raw soil.

In FIG. 23, the horizontal position of the small particle size side partition is 100 mm, 150 mm, 200 mm, 250 mm from the center point of the rotating drum, and the height position of the small particle size side partition is ΔH2 = 135 mm from the lower end of the rotating drum 11. And said. However, when the horizontal position of the small particle size side partition is 250 mm, the height direction position of the small particle size side partition is ΔH2 = 150 mm from the lower end of the rotary drum 11. The horizontal position of the large particle size side partition was −150 mm from the center point of the rotating drum in FIG. 23, and the height of the large particle size side partition was ΔH1 = 150 mm from the lower end of the rotating drum 11. Further, in FIG. 23, θ ₁ = 0 °.

The following is expected due to changes in the partition position on the small particle size side.
(3-1) As the partition position on the small particle size side is located farther from the horizontal center position of the drum of 0 mm, the mass ratio (overall) of the category B increases, and the proportion of the small particle size component in the overall increases.
(3-2) Contrary to (3-1), the farther the small particle size side partition position is from the drum horizontal center position 0 mm, the smaller the mass ratio (overall) of category A, and the medium grain occupied in it. The proportion of the diameter component decreases.

FIG. 36 shows the change in mass ratio (overall: whole grain size band) due to the change in the partition position on the small particle size side at a processing speed of about 2,200 kg / h. As the small particle size side partition position was located farther from the horizontal center position 0 mm of the rotating drum 11, the mass ratio (overall) of the category B increased and the mass ratio (overall) of the category A decreased.

FIG. 37 shows the change in mass ratio depending on the processing speed at the partition position on the small particle size side of 200 mm. Although each mass ratio took an extreme value at around 600 kg / h, no significant change was observed.

FIG. 38 shows the change in mass ratio (overall) depending on the partition position on the small particle size side. Since there is almost no change in the division A, the division B, and the division A + B, it is considered that the equilibrium state is obtained when the small particle size side partition position is 200 mm or more from the horizontal center position of the rotating drum 11.

The mass ratio distribution is shown in FIGS. 39 to 44.

39, 40, and 42 show the mass ratio distribution when the partition position on the small particle size side was changed to 100, 150, and 200 mm at a processing speed of about 2,200 kg / h. Looking at the distributions of Category A, Category B, and Category A + B, the partition position on the small particle size side shifts to the small particle size side as it is located farther from the horizontal center position 0 mm of the rotary drum 11. Table 3 shows the relationship between the partition position on the small particle size side and the magnetization rate. As shown in Table 3, the magnetizing rate did not decrease significantly even if the position of the partition on the small particle size side was changed.

Looking at the distribution of the category N, the closer the partition position on the small particle size side is to the horizontal center position 0 mm of the rotating drum 11, the greater the proportion of the small and medium particle size components in the partition. It is considered that this is mainly due to the effects of (3-1) and (3-2) above.

Table 3 shows the mass ratio (fine particle content magnetic collection rate) of 0 to 212 μm, which has a relatively high contamination concentration, for the magnetized components (Category A + B). As the partition position on the small particle size side is located farther from the horizontal center position 0 mm of the rotating drum 11, the distribution of the magnetically deposited component shifts to the small particle size side. In order to collect more fine particles from this and reduce the radioactivity concentration (concentration ratio) of the low concentration category N, the partition position on the small particle size side should be far from the horizontal center position 0 mm of the rotating drum 11. It turns out to be good.

41, 42, and 43 show the mass ratio distribution when the processing speed was changed to about 600, 2,200, and 400 kg / h at the partition position on the small particle size side of 200 mm. Regardless of the processing speed, almost the same tendency is shown, but when the processing speed is about 600 kg / h, the mass ratio of the category A is larger than the others, and the category B is contradictory to be smaller.

Table 4 shows the relationship between the processing speed and the magnetizing rate (Category A + B). As shown in Table 4, the magnetizing rate did not change so much even if the processing speed changed. As for the relationship between the mass ratio (fine particle size distribution collection rate) of 0 to 212 μm, which has a relatively high contamination concentration, and the processing speed for the magnetically deposited content (Category A + B), the processing speed has changed as shown in Table 4. However, the collection rate of fine-grained magnetism did not change much.

43 and 44 show the mass ratio distribution of the triangular teeth, the partition position on the small particle size side at a processing speed of about 400 kg / h, and the partition position of 250 mm. As shown in FIGS. 43 and 44, when the mass ratio curves of the small particle size side partition positions of 200 mm and 250 mm when the triangular teeth are attached are compared, there is almost no difference, and the small particle size side partition positions of 200 mm or more are considered to be in an equilibrium state.

Graphs of Category A, which is greatly affected by the mass ratio distribution due to the partition position on the small particle size side, are normalized by the mode of the distribution (mode normalized mass ratio) in FIGS. 45, 47, and 49. show. Here, the particle size having the mode value of 0.8 is defined as d ₈₀ , the particle size having 0.2 is defined as d ₂₀ , and these are referred to as the classification index particle size (A). This is shown in FIGS. 46, 48 and 50.

From FIG. 45, at the time of about 2,200 kg / h processing, the normalized particle size distribution shifts to the small particle size side as the partition position on the small particle size side moves away from the horizontal center position 0 mm of the rotating drum 11. .. This indicates that it is advantageous to selectively recover the small particle size component, which is a high concentration component. FIG. 46 shows changes in the classification index particle size (A), which is a guideline for the distribution of the most frequent normalized mass curve under the above conditions. As the partition position on the small particle size side becomes farther from the horizontal center position 0 mm of the rotary drum 11, both d ₈₀ and d ₂₀ decrease monotonically, and the interval between these particle sizes becomes narrower.

From FIG. 47, when the processing speed was changed at about 400, 600, 2,200 kg / h at the partition position on the small particle size side of 200 mm, the standardized particle size distribution was almost the same except for about 600 kg / h. .. FIG. 48 shows the change in the classification index particle size (A), which is a guideline for the distribution of the most frequent normalized mass curve under the above conditions. Regardless of the treatment speed, d ₈₀ and d ₂₀ , these particle size intervals were almost unchanged.

From FIG. 49, when the processing speed is about 400 kg / h, the normalized particle size distribution shifts to the small particle size side as the partition position on the small particle size side moves away from the horizontal center position 0 mm of the rotating drum 11. .. This indicates that it is advantageous to selectively recover the small particle size component, which is a high concentration component. Here, the particle size is further shifted to the smaller particle size side than that shown in FIG. 45. FIG. 50 shows changes in the classification index particle size (A), which is a guideline for the distribution of the most frequent normalized mass curve under the above conditions. As the partition position on the small particle size side became farther from the horizontal center position 0 mm of the rotating drum 11, d ₈₀ decreased, but d ₂₀ was almost constant.

1, 2, 3, 4, 5, 6, 7 Magnetic separation device 10 Magnetic separator 11 Rotating drum 12 Rotating drum surface 18 Magnet part 21 Casing 25 Discharge port 31, 41, 301, 311, 321 Sorting device 32a, 32b, 42a , 42b Partition plate 33a, 33b Vertical plate 38, 302 Separation recovery tank 51 Casing 61 Driver 66 Fixing jig 71 Supply device 73 Traf tip 74 Triangular tooth-shaped plate 101, 102 Contaminant dry treatment system 103 Kneader 113 Soil transfer Device 115 Sorted object transfer device 121 Crushing device 201 Sorted object 202 Sorted object 312 Mixing device 322 Height variable device 323 Lifter with casters 331 Casing 351 Dust collecting device 401 Truck bed

Claims (13)

A magnetic force sorting device that sorts an object to be sorted, which is a mixture of powdery contaminants and ferromagnetic powder and / or paramagnetic powder.
A rotating drum type magnetic separator with a magnet placed inside,
A sorting device installed at the sorting material discharge port of the magnetic separator and classifying the sorted items into particle sizes of N or more (N is an integer of 2 or more).
A supply device provided with a thinning means for thinning the material to be sorted discharged to the discharge port, which supplies the material to be sorted to the magnetic separator.
Equipped with
The magnetic separator includes a position-variable mechanism that can change the position of the magnet with respect to the rotating drum.
The sorting device is provided with a particle size variable mechanism capable of changing the particle size to be classified.
The thinning means is a trough having a triangular tooth shape, a comb tooth shape, a wavy shape, or a trapezoidal shape at the tip in a plan view.
Alternatively, the magnetic force sorting device is characterized in that the thinning means is a trough having a triangular tooth-shaped or comb-shaped or corrugated or trapezoidal member attached to a tip portion in a plan view . The sorting device includes a partition plate that divides the sorted material into two or more particle sizes, or two or more separate collection tanks that divide the sorted material into two or more particle sizes and collect them.
A moving means for moving the partition plate or the separated collection tank up and down and / or left and right.
The magnetic force sorting apparatus according to claim 1, wherein the magnetic force sorting apparatus is provided. The sorting device includes a movable partition plate that divides the sorted object into two or more particle sizes.
The magnetic force sorting device according to claim 1, wherein the movable partition plate is configured to be movable left and right and / or is configured to have a variable height. The first aspect of the present invention is characterized in that the sorting device has a partition plate for classifying the sorted items into 3 or more particle sizes or a separate collection tank having 3 or more sorting items for sorting and collecting the sorted items into 3 or more particle sizes . The magnetic force sorting device described. The magnetic force sorting device according to any one of claims 1 to 4 , wherein the sorting device includes a mixing means for mixing two or more of the sorted items further divided into three or more categories. .. Further, at least, a casing that covers the sorter discharge port of the magnetic separator and the sorter,
A dust collector that sucks and collects the sorted material floating in the casing,
Equipped with
The magnetic force sorting according to any one of claims 1 to 5 , wherein the suction port of the dust collector is provided on the side of the sorting object having a small particle size to be sorted by the sorting device. Device. The magnetic force sorting apparatus according to any one of claims 1 to 6 , further comprising a speed variable means capable of varying the rotational speed of the rotary drum. Further, it is provided with a water content adjusting means for adjusting the water content of the object to be sorted.
The magnetic force sorting device according to any one of claims 1 to 7 , wherein the magnetic force sorting device sorts objects to be sorted whose water content has been adjusted by the water content adjusting means. The magnetic force sorting apparatus according to any one of claims 1 to 8 , wherein the ferromagnetic powder is a ferromagnetic powder containing iron oxide as a main component. The magnetic force sorting apparatus according to any one of claims 1 to 9 , wherein the powdery or granular contaminant is soil contaminated with radioactive substances. The method of using the magnetic force sorting device according to any one of claims 1 to 10 .
A method of using a magnetic force sorting device, characterized in that the sorted product is sorted to a desired particle size by adjusting the usage method of at least one of the following groups (A).
(A) The position of the magnet with respect to the rotating drum of the magnetic separator, the magnetic flux density on the surface of the rotating drum, the supply speed of the object to be sorted, the rotation speed of the rotating drum, the particulate contaminants and the ferromagnetic powder and / or the paramagnetic powder. Mixing ratio, water content of the material to be sorted It is a pollutant dry treatment system that separates powdery contaminants according to the contamination concentration.
The magnetic force sorting device according to any one of claims 1 to 10 .
A mixing device that mixes powdery contaminants with ferromagnetic powder and / or paramagnetic powder,
A magnetic powder supply device that supplies ferromagnetic powder and / or paramagnetic powder to the mixing device,
A contaminant transfer device that transfers stored powdery contaminants to the mixing device, and
An object transfer device for transferring a mixture of a powdery contaminant and a ferromagnetic powder and / or a paramagnetic powder from the mixing device to the supply device.
Equipped with
The contaminant transfer device and / or the sorted material transfer device crushes secondary particles, polishes the surface of powder-like contaminants, and powder-grain-like contaminants during transfer. A pollutant dry treatment system characterized by exerting one or more of the actions of miniaturization. The pollutant dry treatment system according to claim 12 , which is mounted on a vehicle and is configured to enable separate operation while mounted on the vehicle.

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