JP2009183823A - Method for attaching magnetic particles to non-magnetic substance and magnetic separation apparatus for non-magnetic substance - Google Patents

Abstract

An object of the present invention is to increase the capture probability of magnetic particles adhering to a nonmagnetic substance and to recycle magnetic particles that have not adhered to a nonmagnetic substance.
A magnetic separation apparatus for a non-magnetic substance, in which magnetic particles are attached to a non-magnetic substance, and the magnetic non-magnetic substance is magnetically attached by a magnetic filter and separated from a processing solution. A magnetic separation processing unit is provided in the pipe of the processing liquid, and the magnetic separation processing unit is a magnetic particle remixing section, a magnetic-bearing flow path section, a magnetic filter extraction section, a magnetic filter mounting section, and a magnetic filter mounting section from the upstream side, And a moving means for intermittently or continuously moving a plurality of magnetic filters arranged in parallel in the magnetic filter take-out section from the magnetic filter attachment section, and a magnetic filter on the most upstream end side in the magnetic filter take-out section. A conveying means for taking out the magnetic filter and reinserting it into the magnetic particle remixing section, taking out the magnetic filter after a predetermined time, and reinserting it in the most downstream position of the magnetic filter mounting section;
[Selection] Figure 1

Description

  The present invention relates to a method for attaching magnetic particles to a non-magnetic substance and a magnetic separation apparatus for non-magnetic substances. More specifically, the present invention relates to a method for efficiently attaching magnetic particles to a non-magnetic substance to be removed from a processing solution. In addition, it reliably removes nonmagnetic substances, and is particularly suitable for water treatment that removes nonmagnetic substances from a large amount of treated water.

In recent years, pollution of rivers and oceans from factory wastewater, domestic wastewater, etc. has expanded.
When removing the solids contained in the contaminated water, the amount of water is large, so that the speed of the cleaning process is required.
However, when trapping microorganisms, plankton, and bacterial cells that cause contamination with a filtration membrane having micron pores, it takes time to pass through the filtration membrane, and trapped particles accumulate on the filtration membrane. Since clogging is likely to occur, high-speed and large-scale treatment of treated water is difficult due to the necessity of intermittent cleaning.

  In recent years, the treatment of ballast water loaded on ships has become a problem. Ballast water is seawater that is loaded for safe navigation even in an empty state. Ballast water is taken from the nearby waters when leaving the port, drained into the ocean when loading the cargo when entering the port, for example, leaving from Japan Seawater from the Japan Sea area is loaded on the oil tanker as ballast water and drained into the Middle East sea area. When ballast water is discharged into a sea area different from the sea area where water is taken, organisms in the seawater are moved to sea areas that are not originally habitats, which greatly affects the marine ecosystem. Therefore, an international convention for “regulation and management of ship ballast water and sediment” has been adopted, and it is required to purify ballast water in accordance with the contents of the convention.

As this type of water purification apparatus, the present applicant, in Japanese Patent Application Laid-Open No. 2000-254544 (Patent Document 1), removes raw water containing an object to be removed made of plant microorganisms such as algae at a relatively high speed. Is provided for separating and removing the magnetic field.
In the magnetic separation device, iron oxide particles are added to raw water to impart magnetism to the object to be removed, and then passed through a magnetic filter, and the object to be removed is magnetically attached to the magnetic filter and separated and removed. . Since the object to be removed is separated and removed by magnetism as described above, the object to be removed can be separated and removed even if the water passage hole of the magnetic filter is widened, and the water treatment can be speeded up.
In the magnetic separation device of Patent Document 1, since the removal object to which magnetism is imparted by magnetism is captured, the pores of the magnetic filter can be enlarged, and therefore, clogging is extremely unlikely to occur than membrane filtration. There is an advantage that water treatment at high speed becomes possible.

JP 2000-254544 A

However, in the magnetic separation device, it cannot be said that the capture probability that the magnetic particles adhere to the object to be removed is high, and the object to be removed cannot be captured and removed without the magnetic particles adhering to the object to be removed. It is difficult to reliably increase the rate, and there is room for improvement in this regard.
In addition, since magnetic particles that could not adhere to the object to be removed are magnetically attached to the magnetic filter and separated and removed from the raw water, a large amount of magnetic particles are required for the object to be removed, which increases the cost. There is room for improvement.

  The present invention has been made in view of the above problems, and provides a method for increasing the capture probability of magnetic particles adhering to a nonmagnetic substance, and can reuse magnetic particles that have not adhered to a nonmagnetic substance. It is an object to provide a magnetic separation device.

In order to solve the above-mentioned problem, the present invention provides, as a first invention, a method of adding magnetic particles to a treatment liquid containing a nonmagnetic substance, and attaching the magnetic particles to the nonmagnetic substance,
A magnetic-bearing flow path surrounded by a magnet is provided in the flow path of the treatment liquid to which the magnetic particles have been added, and the migration speed of the magnetic particles in the magnetic support flow path is set to be higher or lower than the flow speed of the treatment liquid. There is provided a method for attaching magnetic particles to a non-magnetic substance, characterized by providing a difference in speed and increasing the capture probability that the magnetic particles adhere to the non-magnetic substance.

According to the method, since the magnetic particles are made faster or slower than the flow velocity of the treatment liquid due to the magnetic field generated in the magnetism flow path by the magnet, the magnetic particles flow between the non-magnetic substance flowing at the treatment solution flow velocity. A speed difference occurs. Thereby, the probability that the magnetic particles come into contact with the nonmagnetic substance is increased, and the capture probability that the magnetic particles adhere to the nonmagnetic substance can be increased.
That is, when the magnetic particles and the non-magnetic substance are flowing at the same speed, the magnetic particles and the non-magnetic substance are hardly brought into contact with each other, so that the probability of capturing the magnetic particles on the non-magnetic substance is low. Therefore, by providing a difference in the migration speed between the magnetic particles and the non-magnetic substance, when the magnetic particles are faster than the non-magnetic substance, the magnetic particles catch up with the non-magnetic substance flowing downstream and adhere. When the magnetic particles are slower than the non-magnetic substance, the magnetic particles can catch up with and adhere to the non-magnetic substance flowing upstream.
Specifically, since the magnetic particles tend to approach the center in the axial direction of the magnet (magnetization channel), the magnetic particles are accelerated from the upstream end to the center of the magnetism channel, and the treatment liquid On the other hand, the magnetic particles are decelerated from the center to the downstream end and become slower than the flow rate of the processing liquid.

It is preferable that the magnetic particles are stirred in the processing liquid when introduced, and are circulated through the magnetized flow path in a stirred state.
By stirring the treatment liquid when introducing the magnetic particles as described above, the magnetic particles can be uniformly dispersed in the treatment liquid, and can efficiently adhere to the non-magnetic substance dispersed in the treatment liquid. it can.

The average particle size of the magnetic particles is preferably 0.1 μm to 50 μm, and more preferably 0.1 μm to 20 μm.
By setting the average particle size of the magnetic particles in the above range, it is possible to efficiently capture nonmagnetic substances made of organisms having a size of 0.1 μm to 100 μm.
In addition, by setting the average particle size of the magnetic particles to 0.1 μm or more, the magnetic particles can be easily attached to the nonmagnetic substance and can be hardly released after the attachment. On the other hand, if the average particle size of the magnetic particles exceeds 50 μm, there arises a problem that the magnetic particles are deposited on the bottom of the pipe constituting the flow path and do not work effectively.

When the amount of the treatment liquid is 100% by mass, it is preferable to add 0.05 to 5% by mass of magnetic particles.
By setting the blending amount of the magnetic particles to 0.05% by mass or more, the magnetic particles can be attached to 90% or more of the non-magnetic substance in the treatment liquid, while excessively by setting it to less than 5% by mass. When added, magnetic particles floating in the treatment liquid without being attached to the nonmagnetic substance can be suppressed.

As the magnetic particles to be added, simple substances or alloys of magnetic metals such as iron, nickel, cobalt, silver, and oxides thereof are preferably used, and iron oxide particles such as magnetite are particularly preferably used.
When iron oxide particles having a hydroxyl group on the surface are used as the magnetic particles, if there are plant microorganisms such as algae in the raw water as in the case of the iron oxide particles, hydroxyl groups are also present on the surface of these plant microorganisms. Therefore, hydrogen bonds are formed and magnetism can be imparted to the microorganisms by the iron oxide particles.

It is preferable that the speed difference between the flow rate of the treatment liquid and the migration speed of the magnetic particles in the magnetic channel is 0.1 to 50 mm / sec.
If the difference between the flow rate of the treatment liquid and the migration speed of the magnetic particles in the magnetic channel is less than 0.1 mm / sec, the difference in speed between the nonmagnetic material and the magnetic particles is small, and the magnetic particles adhere to the nonmagnetic material. It is not possible to sufficiently increase the capture probability. On the other hand, if the difference between the flow rate of the treatment liquid and the migration speed of the magnetic particles in the magnetic flow path is greater than 50 mm / sec, there is a problem that even if the magnetic particles and the non-magnetic substance come into contact with each other, they are not fixed and separated. .

According to a second aspect of the present invention, as a second invention, magnetic particles are added to a treatment liquid containing a nonmagnetic substance, and the magnetic particles are adhered to the nonmagnetic substance, and the magnetized nonmagnetic substance is removed with a magnetic filter. A magnetic separation device for non-magnetic substances that are magnetically attached and separated,
A magnetic separation processing section is provided in the pipe of the processing liquid to which the magnetic particles are added, the pipe of the magnetic separation processing section is formed from a magnetically permeable material, and the magnetic particle remixing section extends from the upstream end to a downstream section that is spaced apart from the upstream end. A magnetic passage section in which a predetermined section is surrounded by a magnet downstream from the magnetic particle remixing section, a magnetic filter extraction section in which an upper portion of the pipe is opened from the magnetic bearing section to the downstream side, A magnetic filter mounting section in which a predetermined section from the magnetic filter take-out section to the downstream side is surrounded by a magnet and a plurality of magnetic filters are arranged in parallel in the pipe, and the upper part of the pipe is opened from the magnetic filter mounting section to the downstream end. A filter mounting section, and
Moving means for intermittently or continuously moving the plurality of magnetic filters arranged in parallel in the magnetic filter extraction section from the magnetic filter mounting section, from the downstream side toward the upstream side;
The magnetic filter on the most upstream end side is taken out in the magnetic filter take-out section, re-inserted into the magnetic particle remixing section section, and after a predetermined time, the magnetic filter is taken out and re-inserted into the most downstream position in the magnetic filter mounting section. Conveying means for
There is provided a magnetic separation apparatus for a non-magnetic substance.

In the non-magnetic substance magnetic separation apparatus of the present invention having the above-described configuration, the magnetic particles adhered to the magnetic non-magnetic substance and the non-magnetic substance non-magnetic substance are magnetized by the magnet in the magnetic filter mounting section. The nonmagnetic substance and the magnetic particles can be removed from the treatment liquid by being magnetized and captured by the magnetic filter.
Furthermore, if the magnetic particles that are not attached to the non-magnetic substance remain magnetically attached to the magnetic filter, the magnetic particles are wasted. Therefore, the magnetic filter having the magnetic particles attached thereto is removed from the magnetic filter extraction section. It is taken out and transported to the upstream magnetic particle remixing section by the transport means and reinserted. As a result, the magnetic particles magnetically attached to the magnetic filter can be separated from the magnetic filter and released again into the processing liquid for reuse.
In this way, the magnetic particles magnetically attached to the magnetic filter without adhering nonmagnetic substances are returned to the nonmagnetic region on the upstream side again, and the magnetic particles magnetically attached to the magnetic filter are separated and mixed with the treatment liquid. By reusing them, the amount of magnetic particles used can be reduced, and the cost can be reduced.

Specifically, the magnetic particles are accelerated or decelerated by the magnetic field generated by the magnets surrounding the pipes in the magnetized flow passage section provided in the magnetic separation processing unit, and the magnetic particles are made non-magnetic by the same method as in the first invention. Efficiently adheres to substances.
A plurality of magnetic filters are juxtaposed in the magnetic filter mounting section provided on the downstream side of the magnetism passage section, and these magnetic filters are magnetized by magnets disposed around. The magnetic particles adhered to the magnetic flow passage section and magnetized, and the magnetic particles not adhered to the nonmagnetic material are magnetized on the magnetized magnetic filter. At this time, since the magnetic particles are sequentially magnetized from the magnetic filter on the upstream end side, the most magnetic particles are magnetized on the magnetic filter on the most upstream end side.

Next, after a predetermined amount of magnetic particles adheres to the magnetic filter on the most upstream end side (or after a predetermined time has elapsed), a magnetic filter extraction section provided between the magnetic bearing flow path section and the magnetic filter mounting section Take out the magnetic filter on the most upstream side of the upper opening.
When the taken out magnetic filter is transported and reinserted into the magnetic particle remixing section upstream of the magnetism flow passage space by the transport means, the magnetic filter is disposed at a position away from the magnet in the magnetic filter mounting section. As a result, the non-magnetic substance and magnetic particles that are magnetically attached to the magnetic filter are released from the magnetic filter, and are mixed again in the treatment liquid to reuse the magnetic particles. At this time, the remaining magnetic filters arranged in parallel in the magnetic filter mounting section are moved to the upstream side by the moving means, and the nonmagnetic substance and magnetic particles released by these remaining magnetic filters are again magnetized and captured. .

The magnetic filter from which the magnetic particles are released as described above is conveyed to the magnetic filter mounting section on the downstream side by the conveying means, reinserted at the most downstream position, moved to the magnetic filter mounting section by the moving means, and again Used for magnetic deposition of magnetic particles.
After the above operation is repeated and most of the magnetic particles adhere to the non-magnetic substance, the magnetic filter is washed outside the magnetic separation device, and the magnetic particles magnetically attached to the magnetic filter are discarded without being reused.

It is preferable that a superconducting coil is mounted as a magnet disposed on the outer periphery of the piping in the magnetism flow passage section and the magnetic filter mounting section.
The superconducting wire forming the superconducting coil is preferably a high-temperature superconducting coil using a high-temperature superconducting wire (Bi-2223-based silver sheath wire, Re-based thin film wire).
The cooling of the high-temperature superconducting coil may be a refrigerator-cooled system that does not use a refrigerant (refrigerant-free), a liquid nitrogen cooling that uses liquid nitrogen, or a liquid nitrogen supercooling system.

As described above, when magnetic separation is performed using a superconducting coil, a strong magnetic field can be formed around a fine wire of a magnetic filter made of a magnetic material such as stainless steel disposed in a strong magnetic field generated by the superconducting coil. By using this strong magnetic field, the non-magnetic substance to which the magnetic particles dispersed in the treatment liquid are attached and magnetized can be separated by being magnetized around a thin line.
In addition, when an oxide superconducting wire is used as a superconducting wire, the critical temperature is higher than that of a metal superconducting wire. Is stable.
Further, since liquid nitrogen can be used as the refrigerant, particularly when used as a ballast water treatment apparatus, even if it is mounted on a ship and used, it is extremely stable against fluctuations of the ship. In addition, an electromagnet using an oxide superconducting wire can be configured to be lighter and more compact than an electromagnet using a metal-based superconducting wire, and is installed in a place where the installation area and weight of a ship are large. Is advantageous in some cases.

In addition, the magnetic filter forms holes by knitting fine wires made of a magnetic material mainly composed of stainless steel, iron, nickel, cobalt, etc. into a mesh shape, and the average area of the holes is 0.5 mm ^2. It is preferable to be set to ˜100 mm ² .
When the magnetic filter is formed of a stainless steel wire, rust is less likely to occur and a durable magnetic filter can be obtained.
Further, a magnetic filter formed by the mesh of the wire of stainless steel wire or the like, 90 of the average area of the holes formed by the mesh and 1 mm ² 25 mm ^2, especially-be-removed substance more magnetic 5μm was granted % Or more can be separated.

The magnetic separation device of the present invention is suitably used for water treatment of ballast water stored in a ship such as an oil tanker because a large amount of processing liquid can be efficiently processed.
When used in a ballast water treatment apparatus, the treatment liquid is ballast water stored in a ballast tank of a ship, and the non-magnetic substance is composed of plant microorganisms or animal microorganisms containing algae floating and precipitated in the ballast water, and And a magnetic particle supply unit that drops and stirs the magnetic substance into ballast water, and the magnetic particle supply unit includes the non-magnetic substance to which the magnetic particles are adhered and the ballast water containing the floating magnetic particles. Is fed to the pipe.

  As described above, according to the method for adhering magnetic particles to the non-magnetic substance of the first aspect of the present invention, the magnetic particles are made faster than the flow velocity of the processing liquid by the magnetic field generated in the magnetic bearing flow path by the magnet. Alternatively, since the speed is reduced, a speed difference is generated between the non-magnetic substance flowing at the flow rate of the processing liquid. Thereby, the probability that the magnetic particles come into contact with the nonmagnetic substance is increased, and the capture probability that the magnetic particles adhere to the nonmagnetic substance can be increased.

  According to the magnetic separation apparatus for a non-magnetic substance of the second aspect of the present invention, magnetic particles attached and magnetized non-magnetic substance and magnetic particles not attached to the non-magnetic substance are magnetically attached to the magnetic filter and captured. After that, the magnetic filter is inserted into the upstream magnetic particle remixing section, and the magnetic particles magnetically attached to the magnetic filter are released again into the treatment liquid, so that the magnetic particles can be reused. As a result, the magnetic particles magnetically attached to the magnetic filter without adhering to the non-magnetic substance are not immediately discarded, but are mixed with the treatment liquid again on the upstream side and reused, thereby reducing the amount of magnetic particles used. The cost can be reduced.

Embodiments of the present invention will be described with reference to the drawings.
1 to 6 show a magnetic separation apparatus 10 for nonmagnetic substances according to an embodiment (hereinafter abbreviated as a magnetic separation apparatus).
The magnetic separation apparatus 10 of this embodiment separates and purifies nonmagnetic substances from the treatment liquid L containing nonmagnetic substances such as factory wastewater and domestic wastewater.

  The magnetic separation device 10 includes a processing liquid storage tank (not shown) that stores the processing liquid L, and a pipe 11 that is connected to the processing liquid storage tank and serves as a flow path for the processing liquid L. A separation processing unit 20 is provided. The processing liquid L introduced at the upstream end of the pipe 11 passes through the magnetic separation processing unit 20 to separate and purify the non-magnetic substance 30, and drains from the downstream end of the pipe 11 as the purification processing liquid L ′. Is done.

The processing liquid storage tank is provided with magnetic particle supply means (not shown) for adding the powdered magnetic particles 31 to the stored processing liquid L and stirring and mixing the processing liquid L and the magnetic particles 31. . Iron oxide particles made of magnetite having a hydroxyl group on the surface are used as the magnetic particles 31, and magnetic particles are added to some nonmagnetic substances 30 contained in the treatment liquid L by stirring the treatment liquid L and the magnetic particles 31. 31 is attached to impart magnetism.
The magnetic particles 31 have an average particle size of 0.1 μm to 50 μm, the nonmagnetic substance 30 is made of a living organism having a size of 0.1 μm to 100 μm. % Is added.

  The pipe 11 is made of nonmagnetic stainless steel, or a magnetically permeable material made of FRP, plastic, or the like. The magnetic separation processing unit 20 provided in the pipe 11 includes a magnetic particle remixing section 21, a magnetic bearing passage section 22, a magnetic filter extraction section 23, a magnetic filter mounting section 24, and a magnetic filter mounting section 25 in order from the upstream side. .

The configuration of the magnetic separation processing unit 20 will be described in order from the upstream side.
The magnetic particle remixing section 21 is a section from the upstream end of the magnetic separation processing section 20 to a downstream section that is a predetermined distance away from the magnetic separation reprocessing section 20. An opening 11 a for insertion is provided in the upper part of the pipe 11. By reinserting the magnetic filter 12 magnetized with the nonmagnetic substance 30 and the magnetic particles 31 into the pipe 11 from the opening 11a, the nonmagnetic substance 30 and the magnetic particles 31 magnetized on the magnetic filter 12 are released and processed. Remixed in liquid L.

  As shown in FIG. 2, the magnetized flow passage section 22 provided in a predetermined section downstream of the magnetic particle remixing section 21 surrounds the pipe 11 with the superconducting magnet 13 to form a required magnetic field in the pipe 11. is doing. The superconducting magnet 13 is formed of a coil 13a around which an oxide superconducting wire is wound, and is accommodated in a cooling vessel 13b that maintains the coil 13a at a superconducting temperature. In the present embodiment, a double pancake coil of a bismuth 2223-based oxide superconducting wire is composed of a laminated coil laminated in the axial direction.

Since the magnetic particles 31 tend to approach the center in the axial direction where the magnetic field of the superconducting magnet 13 (magnetic-magnetic channel section 22) is strong, the magnetic particles 31 extend from the upstream end to the center of the magnetic-magnetic channel section 22. While being accelerated, the flow rate becomes higher than the flow rate of the processing liquid L, and from the center to the downstream end, the magnetic particles 31 are decelerated and become lower than the flow rate of the processing liquid L. On the other hand, the nonmagnetic substance 30 to which the magnetic particles 31 are not attached flows at the same speed as the flow rate of the processing liquid L regardless of the magnetic field.
Therefore, as shown in FIG. 2, a difference occurs in the migration speed between the nonmagnetic substance 30 to which the magnetic particles 31 are not attached and the magnetic particles 31 in the magnetism flow passage section 22. The speed difference between the flow rate of the processing liquid L and the migration speed of the magnetic particles 31 in the magnetism flow path section 22 is set to 0.1 to 50 mm / sec. In FIG. 2, the length of the arrow indicates the migration speed, and the longer the arrow, the faster the speed.

Specifically, on the upstream side (the left side in FIG. 2) of the magnetism flow passage section 22, the magnetic particles 31 are faster than the nonmagnetic material 30, and the magnetic particles 31 catch up with the nonmagnetic material 30 flowing downstream. On the other hand, on the downstream side (the right side in FIG. 2), the magnetic particles 31 are slower than the nonmagnetic substance 30, and the magnetic particles 31 can be caught up and attached to the nonmagnetic substance 30 flowing upstream. .
As described above, in the magnetic-bearing flow path section 22, the magnetic particles 31 are efficiently attached to the nonmagnetic material 30 by giving a speed difference between the nonmagnetic material 30 and the magnetic particles 31.
The magnetic particles 31 adhere to most of the non-magnetic substances 30 by the stirring in the treatment liquid storage tank and the method of attaching the magnetic particles 31 to the non-magnetic substances 30 in the magnetism-passage section 22.

The flow velocity of the processing liquid L, that is, the velocity difference between the velocity of the non-magnetic substance 30 and the migration velocity of the magnetic particles 31 in the magnetized flow passage section 22 is v (μm / sec), the radius of the magnetic particles 31 is r (μm), If the migration time of the magnetic particles 31 is t (sec), the migration volume of the magnetic particles 31 relative to the nonmagnetic material 30 is πr ² vt (μm ³ ) as shown in FIG. Therefore, when the concentration of the magnetic particles 31 is Cm (ppm), the migration volume of the entire magnetic particles 31 is πr ² vt · Cm (μm ³ ).
When the concentration of the non-magnetic substance 30 is C (ppm), πr ² vt · Cm · C (number) of non-magnetic substances in the migration volume πr ² vt · Cm (μm ³ ) of the entire magnetic particle 31. 30 will be present. The larger the value of πr ² vt · Cm · C, the higher the adhesion rate of the magnetic particles 31 to the nonmagnetic material 30.

Further, the adhesion rate of the magnetic particles 31 to the nonmagnetic substance 30 also depends on the radius of the nonmagnetic substance 30. When the radius of the nonmagnetic material 30 is rc (μm), the magnetic particles 31 adhere to the nonmagnetic material 30 when the distance between the center of the magnetic particles 31 and the center of the nonmagnetic material 30 is equal to or less than r + rc (μm). Therefore, as shown in FIG. 3B, the larger the π (r + rc) ² vt (μm ³ ), the higher the adhesion rate of the magnetic particles 31 to the nonmagnetic material 30.

Further, if the concentration of the nonmagnetic substance 30 to which the magnetic particles 31 are not attached is C1, and the probability that the magnetic particles 31 adhere to the nonmagnetic substance 30 is α, the magnetic particles 31 adhere to the nonmagnetic substance 30. The change of C1 by doing
dC1 / dt = −απ (r + rc) ² · v · Cm · C1
Assuming that the number of magnetic particles 31 is larger than the number of nonmagnetic substances 30 to which magnetic particles 31 are not attached, and assuming that Cm is constant,
C1 = C1 (t = 0) · exp (− [απ (r + rc) ² · v · Cm] · t)
The half-life Th is Th = απ (r + rc) ² · v · Cm. Based on this equation, the optimum value of the speed difference v from the migration speed of the magnetic particles 31 and the concentration Cm of the magnetic particles 31 are set.

  A magnetic filter extraction section 23 provided in a predetermined section on the downstream side of the magnetism passage section 22 includes a magnetic filter 12A on the most upstream end of the magnetic filters 12 arranged in parallel with the magnetic filter mounting section 24 on the downstream side. An opening 11 b for taking out is provided in the upper part of the pipe 11.

A magnetic filter mounting section 24 provided in a predetermined section on the downstream side of the magnetic filter take-out section 23 surrounds the pipe 11 with the superconducting magnet 14 and has a plurality of magnetic filters 12 arranged in parallel at intervals in the axial direction. A moving means 15 is provided for intermittently or continuously moving the magnetic filters 12 arranged side by side from the downstream side to the upstream side.
These magnetic filters 12 are magnetized by the magnetic field generated by the superconducting magnet 14, and when the processing liquid L passes through the magnetized magnetic filter 12, the magnetic particles 31 contained in the processing liquid L adhere and become magnetized. The nonmagnetic substance 30 and the magnetic particles 31 not attached to the nonmagnetic substance are magnetically attached to the magnetic filter 12. As a result, the treatment liquid L that has passed through the magnetic filter 12 becomes a purification treatment liquid L ′ that does not contain the nonmagnetic substance 30 and the magnetic particles 31.
The uppermost magnetic filter 12A of the magnetic filters 12 arranged in parallel is arranged in the magnetic filter extraction section 23 upstream of the upstream end of the superconducting magnet 14, but the magnetic filter extraction section 23 is also superconductive. By setting within the range affected by the magnetic field of the magnet 14, the magnetic filter 12A on the most upstream side remains magnetized.

The superconducting magnet 14 is formed of a coil 14a around which an oxide superconducting wire is wound, and is accommodated in a cooling container 14b that maintains the coil 14a at a superconducting temperature. In this embodiment, a double pancake coil of a bismuth 2223-based oxide superconducting wire is constituted by a laminated coil laminated in the axial direction.
Each of the magnetic filters 12 is made of a metal wire mesh made of a magnetic material. In this embodiment, it is formed from a stainless steel net having a wire diameter of 2 mm, the diameter of the hole 21a surrounded by the mesh is 30 mm, the length of one side is about 4 mm, and the hole is 16 mm ^2. So that it can be captured. Further, about 20 magnetic filters 12 made of stainless steel are arranged in parallel in the pipe 11 at a constant pitch.

The moving means 15 includes a ball screw that passes through the center of the magnetic filter 12 and a motor (not shown) that rotates the ball screw. When the ball screw is rotated by the motor, the magnetic filter 12 that cannot rotate in the pipe 11 is used. Is configured to move from the downstream side to the upstream side.
As described above, the magnetic filter 12A on the most upstream side of the magnetic filters 12 arranged in parallel is disposed in the magnetic filter extraction section 23. When the magnetic filter 12A is taken out from the opening 11b of the pipe 11, In this case, the entire magnetic filter 12 is moved to the upstream side by the moving means 15 so that the magnetic filter 12 </ b> B that is now at the most upstream end is disposed in the magnetic filter extraction section 23.

  A magnetic filter mounting section 25 provided in a predetermined section downstream of the magnetic filter mounting section 24 has an opening 11 c for inserting the magnetic filter 12 taken out from the upstream magnetic particle remixing section 21 into the pipe 11. It is provided in the upper part of the pipe 11.

  Further, the magnetic separation device 10 takes out the magnetic filter 12A on the most upstream side in the magnetic filter take-out section 23, reinserts it into the magnetic particle remixing section section 21, and takes out the magnetic filter 12A after a predetermined time and magnetically Conveying means 16 for reinsertion is provided at the most downstream position of the filter mounting section 25. As shown in FIG. 4, the transport means 16 includes a transport pipe 16a communicating with the openings 11a, 11b, 11c of the pipe 11, and transports the magnetic filter 12 through the transport pipe 16a. In this conveyance, the magnetic filter 12 is conveyed by air pressure or a motor.

Next, a treatment liquid purification process performed in the separation apparatus 10 will be described.
First, the powdery magnetic particles 31 are added to the processing liquid L stored in the processing liquid storage tank by the magnetic particle supply means, and the processing liquid L and the magnetic particles 31 are mixed by stirring and included in the processing liquid L. Magnetic particles 31 are attached to some nonmagnetic materials 30 to impart magnetism.
Next, the processing liquid L to which the magnetic particles 31 have been added is introduced into the pipe 11, and the magnetic particles 31 are faster than the flow velocity of the processing liquid L in the magnetic-bearing flow path section 22 of the magnetic separation processing unit 20 provided in the pipe 11. Alternatively, at low speed, the magnetic particles 31 are efficiently attached to the remaining non-magnetic substance 30 to which the magnetic particles 31 have not been attached in the treatment liquid storage tank.

Next, the magnetic particles 31 that are magnetized by the magnetic particles 31 and the magnetic particles 31 that are not attached to the nonmagnetic materials 30 are magnetized by the superconducting magnet 14 in the magnetic filter mounting section 24. Magnetized and captured.
The treatment liquid L that has passed through the magnetic filter 12 in this manner is drained from the downstream end of the pipe 11 as a purification treatment liquid L ′ from which the nonmagnetic substance 30 and the magnetic particles 31 have been removed.

  If the purification treatment of the treatment liquid L is continued, the nonmagnetic substance 30 and the magnetic particles 31 magnetized by the magnetic particles 31 are sequentially magnetized from the magnetic filter 12 on the upstream end side. The most non-magnetic substance 30 and magnetic particles 31 are magnetically attached to 12A. At this time, the magnetic particles 31 magnetically attached to the magnetic filter 12 </ b> A contain a large number of magnetic particles 31 that are not attached to the nonmagnetic substance 30.

Therefore, the purification process of the treatment liquid L is performed by reusing the magnetic particles 31 that are not attached to the nonmagnetic substance 30 in the following steps.
First, as shown in FIG. 5, the magnetic filter 12A on the most upstream end side where a large number of nonmagnetic substances 30 and magnetic particles 31 are magnetized is taken out from the opening 11b of the magnetic filter extraction section 23 by the conveying means 16, It is conveyed to the magnetic particle remixing section 21 and reinserted into the pipe 11 through the opening 11a.
Since the re-inserted magnetic filter 12A is not magnetized by being moved away from the superconducting magnet 14 in the magnetic filter mounting section 24, the nonmagnetic substance 30 and the magnetic particles 31 that are magnetically attached to the magnetic filter 12A are magnetized. Free from the filter 12A, the magnetic particles 31 are mixed again in the processing liquid L and reused. At this time, the remaining magnetic filters 12 juxtaposed in the magnetic filter mounting section 24 are moved upstream by the moving means 15, and the nonmagnetic substance 30 and the magnetic particles 31 released by these remaining magnetic filters 12 are again removed. Capture by magnetizing.

As described above, the magnetic filter 12A from which the nonmagnetic substance 30 and the magnetic particles 31 are released is taken out again from the opening 11a of the magnetic particle remixing section 21 by the conveying means 16 as shown in FIG. It is conveyed to the attachment section 25 and reinserted into the pipe 11 through the opening 11c. The magnetic filter 12A inserted in the magnetic filter mounting section 25 is juxtaposed on the most downstream end side of the magnetic filter 12 juxtaposed in the magnetic filter mounting section 24, and is moved to the magnetic filter mounting section 24 by the moving means 15. After moving to the upstream side, the nonmagnetic substance 30 and the magnetic particles 31 are again used for trapping the magnetic adhesion.
After the above operation is repeated and most of the magnetic particles 31 adhere to the non-magnetic substance 30, the magnetic filter 12 on which the non-magnetic substance 30 and the magnetic particles 31 are magnetized is washed outside the magnetic separation device 10 to obtain a magnetic filter. The magnetic particles 31 magnetically attached to 12 are discarded without being reused.

According to the above-described configuration, the magnetic filter in which the magnetic particles 31 are attached and magnetized, and the magnetic particles 31 not attached to the nonmagnetic material 30 are magnetized by the superconducting magnet 14 in the magnetic filter mounting section 24. After the magnetic filter 12 is magnetized and captured, the magnetic filter 12 is taken out from the upstream magnetic filter extraction section 23, inserted into the upstream magnetic particle remixing section 21, and magnetically magnetized on the magnetic filter 12. By releasing 31 again into the treatment liquid L, the magnetic particles 31 can be reused.
As a result, the magnetic particles 31 magnetically attached to the magnetic filter 12 without adhering to the non-magnetic substance 30 are not immediately discarded, but are mixed with the treatment liquid again on the upstream side and reused, whereby the magnetic particles 31 are reused. Can be used and the cost can be reduced.

  Further, in the magnetism-bearing channel section 22 of the magnetic separation processing unit 20, the magnetic particles 31 are made faster or slower than the flow velocity of the treatment liquid L by the magnetic field generated in the magnetism-bearing channel by the superconducting magnet 13. A speed difference is generated between the liquid L and the nonmagnetic substance 30 flowing at the flow rate. As a result, the probability that the magnetic particles 31 come into contact with the nonmagnetic substance 30 is increased, the probability of capturing the magnetic particles 31 attached to the nonmagnetic substance 30 can be increased, and the magnetic particles 31 are efficiently attached to the nonmagnetic substance 30. Can be made.

In the magnetic separation device 10 of the present embodiment, the treatment liquid L, which is factory wastewater or domestic wastewater, is purified, but the treatment liquid composed of ballast water stored in a ship's ballast tank is used for purification treatment. Also good.
In this case, as shown in FIG. 7, the magnetic separation device 10 is mounted on a large vessel 100 such as an oil tanker, and is composed of plant microorganisms or animal microorganisms containing algae that float and settle in the treatment liquid L made of loaded ballast water. Remove non-magnetic substances during navigation.
Specifically, the processing liquid L stored in the ballast tank 101 is supplied to the processing liquid storage tank of the magnetic separation device 10 via the pipe 102, and the purification processing liquid L ′ purified by the magnetic separation processing unit 20 is piped. It is fed to an empty ballast tank 101 via 103.

Seawater 1000 m ³ of radius 10μm or more non-magnetic material is included 8 × 10 ⁷ cells / ^{m 3} and purification treatment by using a magnetic separation apparatus 10 of the embodiment. The treatment liquid storage tank was a 2t magnetism holding tank, and the magnetic particles were continuously added to the seawater so that the concentration of the magnetic particles was always 100 ppm. The treatment speed of the purification treatment was 100 t per hour, and the superconducting magnetic field in the magnetic filter mounting section 24 was 2T.
When 1000 m ³ of seawater was purified under the above conditions, the number of non-magnetic substances after purification was 3 × 10 ⁵ / m ³ . The magnetic particles used were 124 kg.

(Comparative Example 1)
The seawater purification process was performed using a magnetic separation device that does not have the magnetically conducting flow path section 22 as in the above embodiment and does not reuse the magnetic particles attached to the magnetic filter.
Other conditions were the same as in the previous example.
When 1000 m ³ of seawater was purified under the above conditions, the number of nonmagnetic substances after the purification was 3 × 10 ⁷ / m ³ . The used magnetic particles were 103 kg.
In Comparative Example 1, the purification treatment ability was much inferior despite using approximately the same amount of magnetic particles as in the example.

(Comparative Example 2)
The seawater purification process was performed using a magnetic separation device that does not have the magnetically conducting flow path section 22 as in the above embodiment and does not reuse the magnetic particles attached to the magnetic filter.
Magnetic particles were continuously added to seawater so that the concentration of magnetic particles was always 1000 ppm.
Other conditions were the same as in the previous example.
When 1000 m ³ of seawater was purified under the above conditions, the number of nonmagnetic substances after the purification was 6 × 10 ⁵ / m ³ . The magnetic particles used were 950 kg.
In Comparative Example 2, despite the use of a larger amount of magnetic particles than in the Example, the purification treatment ability was inferior, and about twice as much nonmagnetic material as in the Example remained in the purification treatment liquid.

  The above-described embodiments are exemplifications in all points, and are not limited to these embodiments. The scope of the present invention is indicated by the scope of claims, and all modifications within the scope equivalent to the scope of claims are made. Is included.

  The method of attaching magnetic particles to a non-magnetic substance and the magnetic separation apparatus for non-magnetic substance of the present invention are for ballast water, paper wastewater treatment, factory wastewater treatment (semiconductor, steel, food treatment, etc.), hospital It can be widely used as a purification device for industrial wastewater containing a large amount of solid matter such as wastewater treatment. Furthermore, it is also effective as a pretreatment device for a desalination process of a seawater desalination apparatus.

It is the schematic which shows the magnetic separation apparatus of embodiment of this invention. It is drawing which shows the adhesion method of the magnetic particle to the nonmagnetic substance in a magnetic-bearing flow path area. It is drawing regarding the migration volume of a magnetic particle. It is sectional drawing of a magnetic separation apparatus. It is drawing which shows the process of conveying a magnetic filter from a magnetic filter extraction area to a magnetic particle remixing area. It is drawing which shows the process of conveying a magnetic filter from a magnetic particle remixing area to a magnetic filter attachment area. It is drawing which shows the modification which applied the magnetic separation apparatus of embodiment to the process of ballast water.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Magnetic separator 11 of nonmagnetic substance Pipe 12 Magnetic filter 13, 14 Superconducting magnet 13a, 14a Superconducting coil 13b, 14b Cooling vessel 15 Moving means 16 Conveying means 20 Magnetic separation processing part 21 Magnetic particle remixing section 22 Section 23 Magnetic filter extraction section 24 Magnetic filter mounting section 25 Magnetic filter mounting section 30 Non-magnetic substance 31 Magnetic particle 100 Ship 101 Ballast tank L Processing liquid L ′ Purification processing liquid

Claims (5)

A method of adding magnetic particles to a treatment solution containing a non-magnetic substance, and attaching the magnetic particles to the non-magnetic substance,
A magnetic-bearing flow path surrounded by a magnet is provided in the flow path of the treatment liquid to which the magnetic particles have been added, and the migration speed of the magnetic particles in the magnetic support flow path is set to be higher or lower than the flow speed of the treatment liquid. A method for attaching magnetic particles to a non-magnetic material, characterized by increasing a probability of capturing the magnetic particles to the non-magnetic material by providing a difference in speed. The magnetic particles are stirred at the time of charging into the treatment liquid, and are circulated in the magnetized flow path in a stirred state, and
The average particle size of the magnetic particles is 0.1 μm to 50 μm, the non-magnetic substance is a living organism of 0.1 μm to 100 μm, and when the amount of the treatment liquid is 100% by mass, the magnetic particles are added in an amount of 0.05 to 5% by mass. The method for adhering magnetic particles to a non-magnetic substance according to claim 1, wherein a speed difference between the flow rate of the treatment liquid and the migration speed of the magnetic particles in the magnetic flow path is 0.1 to 50 mm / sec. Magnetic separation of a non-magnetic substance by adding magnetic particles to a treatment liquid containing a non-magnetic substance, attaching the magnetic particles to the non-magnetic substance, and magnetizing and separating the magnetic non-magnetic substance with a magnetic filter A device,
A magnetic separation processing section is provided in the pipe of the processing liquid to which the magnetic particles are added, the pipe of the magnetic separation processing section is formed from a magnetically permeable material, and the magnetic particle remixing section extends from the upstream end to a downstream section that is spaced apart from the upstream end. A magnetic passage section in which a predetermined section is surrounded by a magnet downstream from the magnetic particle remixing section, a magnetic filter extraction section in which an upper portion of the pipe is opened from the magnetic bearing section to the downstream side, A magnetic filter mounting section in which a predetermined section from the magnetic filter take-out section to the downstream side is surrounded by a magnet and a plurality of magnetic filters are arranged in parallel in the pipe, and the upper part of the pipe is opened from the magnetic filter mounting section to the downstream end. A filter mounting section, and
Moving means for intermittently or continuously moving the plurality of magnetic filters arranged in parallel in the magnetic filter extraction section from the magnetic filter mounting section, from the downstream side toward the upstream side;
The magnetic filter on the most upstream end side is taken out in the magnetic filter take-out section, re-inserted into the magnetic particle remixing section section, and after a predetermined time, the magnetic filter is taken out and re-inserted into the most downstream position in the magnetic filter mounting section. Conveying means for
A magnetic separation apparatus for non-magnetic substances, comprising:   The nonmagnetic substance magnetic separation device according to claim 3, wherein a superconducting coil is used as the magnet disposed on the outer periphery of the piping of the magnetism flow passage section and the magnetic filter mounting section.   The treatment liquid is ballast water stored in a ballast tank of a ship, and the non-magnetic substance is composed of plant microorganisms or animal microorganisms including algae that float and settle in the ballast water, and the magnetic substance is dropped into the ballast water. A magnetic particle supply means for stirring, and from the magnetic particle supply means, the non-magnetic substance to which the magnetic particles are adhered and the ballast water containing the floating magnetic particles are supplied to the pipe. The magnetic separation apparatus of the nonmagnetic substance according to claim 3 or 4.

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