JP2005199163A - Collection by filtration apparatus and method utilizing magnetic bead - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means for not only filtering and removing a solid substance, i.e., an impurity existing in a material fluid but also collecting (collecting by filtration) and sorting the desired solid substance existing in the material fluid or a means for separating to the solid substance and the clean fluid in the means in which a filter medium is not made disposal and is repeatedly used (semi-permanently usable). <P>SOLUTION: The collection by filtration apparatus is provided with a fluid to be treated chamber 4 for receiving the material fluid containing the solid substance 7; a filter medium layer 11 provided on a lower part of the fluid to be treated chamber; a fluid permeating member 9 for supporting the filter medium layer; and a clean fluid chamber 5 provided below the fluid permeating member. In the collection by filtration apparatus, the magnetic beads 6 are closely filled in the filter medium layer. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a filtering device, a multi-stage filtering device (that is, a classification device), and a raw material fluid processing method.

In recent years, in various industrial fields such as biotechnology, electronics, and mechanics, various solid substances existing in a raw material fluid, especially submicron to micron grade suspended or floating solid substances (iron rust, foreign matters, other impurities; Nematodes such as yeast, bacteria and viruses; blood cells such as red blood cells, white blood cells and platelets; intracellular organelles such as mitochondria and lysosomes; There is a growing need for sorting and sorting.
As one of filter media except micron-class solid materials, precision filter paper has been known for a long time, but its pore shape is indefinite, easily clogged, and disposable. Also, many types of films (membrane filters) having micron-class pore diameters are provided and are convenient, but they have not yet solved the problem of clogging and are also disposable. Furthermore, an ultrafiltration device using a hollow fiber membrane (hollow fiber) having a large number of submicron-class holes is also used in the water purification field and the like, but if it is clogged, it must be replaced with a new one.

  On the other hand, water purifiers and filters using magnetic powder that can be repeatedly used as a filter medium (that is, not disposable) have been proposed in the following Patent Documents 1 to 4 and the like, and are notable. However, the filter medium used in these water purifiers and filters is magnetic powder, not magnetic beads. In addition, these are devices that remove foreign substances and impurities such as iron rust and turbid components in tap water, bacteria and pollutants in bath water, etc., and devices that collect (filter) or separate desired solid substances Absent.

JP-A-9-253426 JP 2000-93715 A JP 2000-153104 A JP 2000-342914 A

  The object of the present invention is not to make the filter medium disposable, but to use it repeatedly (can be used semi-permanently), simply by filtering out solid substances of impurities present in the raw fluid. Rather, it is to provide a means for collecting (filtering) or separating a target solid substance present in the raw material fluid, or a means for separating the solid substance into a clean fluid.

The present invention has been made on the basis of several important findings and viewpoints as follows.
The first point is that one of the inventors of the present invention has previously developed a method for manufacturing a spherical magnetic beads having a spherical shape and a submicron or micron grade particle size almost uniformly. The spherical shape of the magnetic beads with almost uniform particle size was easily available,
The second point is that the pore diameter of the interparticle void when the almost uniform true sphere (fine particle) is packed as a filter medium is about 1/8 of the particle diameter (D) of the true sphere (fine particle). By using the interparticle voids, it is possible to capture a small solid substance that is about one-eighth of the true sphere that is the filter medium.
The third point is about one order of magnitude (for example, a particle size of 8 μm) rather than uniformly punching micropores of an accurate size (for example, 1 μm) in a film or sheet for a membrane filter. It is easier to produce uniform spheres (magnetic beads).

In order to achieve the above object, the present invention has the following configuration.
That is, as illustrated in FIG. 1, the present invention includes a fluid chamber 4 to receive a raw material fluid containing a solid substance 7, a filter material layer 11 provided in a lower portion (or bottom) of the fluid chamber 4, A filter device comprising a fluid-permeable member (support) 9 that supports the filter medium layer 11 and a clean fluid chamber 5 provided below the fluid-permeable member (support) 9, The filter device 1 is characterized in that the magnetic beads 6 are closely packed.

The present invention also provides a method for treating a raw fluid containing a fine solid substance. That is,
By tightly filling magnetic beads (filter medium) 6 onto a fluid permeable member 9 that allows fluid to pass but not filter medium, the inter-bead gap hole (size of the filtration hole) is reduced to the diameter (D) of the magnetic beads. After forming the filter medium layer 11 having a size of about one-eighth (D / 8) of the above, a raw material fluid containing the solid substance 7 larger than the inter-bead gap hole is passed through the filter medium layer 11, and the filter medium layer 11. The raw material fluid treatment method is characterized by separating the solid material 7 trapped in the filter material into a clean fluid that has passed through the filter medium layer 11.

This processing method can also be said as follows if the view is changed. That is,
In a processing method for separating a raw material fluid containing a solid substance having a minimum particle diameter d desired to be captured into a solid substance and a clean fluid, the particle diameter is placed on the fluid permeable member 9 that passes the fluid but does not pass the filter medium. After forming the filter medium layer 11 closely packed with magnetic beads aligned in the vicinity of about 8d, the raw material fluid containing the solid substance is passed through the filter medium layer 11 and the solid substance trapped by the filter medium and the clean medium that has passed through the filter medium layer are passed. A raw material fluid treatment method, wherein the raw material fluid is separated into different fluids.

In the present specification, a case where the meaning of collection is strong is referred to as “filtering”, and a case where the meaning of removal is strong is referred to as “filtration”, but the two are not necessarily strictly distinguishable.
When the fluid of the raw material fluid containing a minute solid substance is liquid, it is called raw water, raw material liquid, liquid to be processed, and when the fluid is gas, it is called raw material gas, gas to be processed, contaminated air.

<Action>
The interparticle voids in the case of closely packing a large number of true spheres (particle size D) with exactly the same particle size are mathematically calculated as voids having pores with a size of D / 6.45. The By the way, since the particle diameter (average value: D) of the magnetic beads actually used varies somewhat, the inter-particle gap in which these are closely packed is about D / 8. That is, interparticle voids having uniform pores that are approximately an order of magnitude lower than the particle size of the magnetic beads used are obtained. The interparticle voids can be used to filter or filter suspended or floating solid substances present in liquids and exhaust gases.

According to the present invention, it is possible to provide an apparatus or a method in which the filter medium is not disposable but can be used repeatedly (semi-permanent use is possible). Moreover, not only the solid substances of impurities present in the raw material fluid are filtered out, but also the target solid substances existing in the raw material fluid are collected (filtered) or sorted in order of size. An apparatus or method, or an apparatus or method for separating a solid material and a clarified filtrate (or a clean gas, etc.) can be provided.
The apparatus of the present invention can be suitably used for various types of filtration devices or filtration devices for producing ultrapure water, household or industrial water purifiers, air purifiers, air filters, exhaust gas filters, and the like. In addition, since the filter medium can be washed and reused with a simple operation, there is no need for labor and cost for replacement with a new one.

The present invention will be described in more detail.
As described above, the filtering device of the present invention includes a processing fluid chamber 4 that receives a raw material fluid containing a solid substance 7, and a filter material layer 11 provided in a lower portion (or bottom) of the processing fluid chamber 4. A filter device comprising a fluid-permeable member (support) 9 that supports the filter medium layer 11 and a clean fluid chamber 5 provided below the fluid-permeable member (support) 9, Is a filtration device 1 in which magnetic beads 6 are closely packed.

Here, in the filtration device, it is preferable that the fluid chamber 4 to be processed, the filter medium layer 11, the fluid permeable member (support) 9 and the clean fluid chamber 5 are integrated.
Furthermore, it is preferable to attach a magnet (electromagnet) 8 to attract the magnetic beads. However, the magnet (electromagnet) 8 at this time can be integrally assembled to the above-described integrated structure, or can be separated.

  In order to perform uniform filtration or filtration, it is preferable that the magnetic beads have the same particle diameter (D). “Same particle size” means 20% or less, preferably 15% or less, when the variation in the particle size of the magnetic beads is expressed by a coefficient of variation. By using magnetic beads having a uniform particle size, a filter medium layer (filter layer) having uniform inter-particle voids (filter holes) can be made. It becomes about 1/8 of the diameter (D / 8). That is, using a magnetic bead having a predetermined particle diameter, a filter medium layer (filter layer) having a desired hole size can be arbitrarily formed within a range of 0.1 to 40 μm.

  When magnetic beads (filter medium) 6 having a small bead diameter are used, the size of the hole of the fluid permeable member (support) 9 that holds the beads is set so that the magnetic beads 6 do not flow out. Must be small. If it does so, the filtration resistance in the fluid permeable member 9 will become large, and it will become easy to produce clogging here. In order to prevent this, another magnetic material that is larger and heavier than the magnetic beads 6 and has a uniform bead diameter is provided between the filter medium layer 11 filled with the magnetic beads (filter medium) 6 and the fluid-permeable member (support) 9. It is also possible to design the pore size of the fluid permeable member (support) 9 larger by forming the underlay layer 15 in which beads are closely packed (see FIG. 4).

  The present invention is also a multi-stage filtration apparatus in which a plurality of the filtration apparatuses of FIG. 1 are connected, and the particle size of the magnetic beads filled in the filter medium layer 11 at each stage is higher on the upstream side than on the downstream side. A multistage filtration device (classification device) 3 characterized by being large is also provided (see FIG. 5).

As described above, the present invention also provides a method for treating a raw material fluid containing a fine solid substance. That is,
By tightly filling magnetic beads (filter medium) 6 on a fluid permeable member 9 that allows fluid to pass but not filter medium, the inter-bead gap hole (size of the filtration hole) is about 8 times the diameter of the magnetic beads. After the filter medium layer 11 having a size of 1 / (D / 8) is formed, the raw material fluid containing the solid substance 7 larger than the inter-bead gap hole is passed through the filter medium layer 11 and captured by the filter medium layer 11. The raw material fluid treatment method is characterized in that the solid material 7 is separated into a clean fluid that has passed through the filter medium layer 11.

  At this time, in order to perform uniform filtration or filtration, it is preferable that the magnetic beads have the same particle diameter (D). “The particle size is uniform” has the same meaning as described above. By using magnetic beads having a uniform particle diameter, a filter medium layer (filter layer) having uniform interparticle voids (filter holes) can be produced.

This processing method can also be said as follows. That is,
In a processing method for separating a raw material fluid containing a solid substance having a minimum particle diameter d desired to be captured into a solid substance and a clean fluid, the particle diameter is placed on the fluid permeable member 9 that passes the fluid but does not pass the filter medium. After forming the filter medium layer 11 closely packed with magnetic beads aligned in the vicinity of about 8d, the raw material fluid containing the solid substance is passed through the filter medium layer 11 and the solid substance trapped by the filter medium and the clean medium that has passed through the filter medium layer are passed. A raw material fluid treatment method, wherein the raw material fluid is separated into different fluids.

Next, the magnetic beads to be used, the production method thereof, the members to be used, the raw material fluid, the operating pressure, the cleaning method of the filter medium, etc. will be described.
(1) Magnetic beads The magnetic beads used in the present invention are spherical magnetic particles, preferably spherical composite particles in which magnetic powder is wrapped with a polymer. Here, the spherical shape includes a true spherical shape, a shape close to a spherical shape, and a shape somewhat close to a spheroid, and the most preferable one is a true spherical shape. This is because by filling the magnetic beads (particle size: D) with no gap between each other, a filter medium layer (filtration layer) having a uniform inter-bead pore size (size of the filtration hole) can be formed. Moreover, manufacture is also easy.

The magnetic beads to be used must also have a particle size of a certain value (minimum) or more, and the minimum particle size is determined in relation to the minimum particle size of the solid substance to be filtered. Usually, it is about 8 times the minimum particle size of the substance to be filtered (its particle size is d). However, since the shape of the solid substance to be filtered is usually indeterminate, the area in plan view of the solid substance is measured, and the diameter (average value) when this is replaced with a circle of the same area, The particle size of the solid material.
The minimum particle diameter of the magnetic beads can be in a wide range, and is usually 0.1 μm to 300 μm, preferably 1 μm to 100 μm. If the shape of the magnetic bead is not a true sphere but is distorted, measure the area of the magnetic bead in plan view, and use the diameter (average value) when this is replaced with a circle of the same area as the particle size of the magnetic bead. To do.

The magnetic beads used in the present invention may have a coating layer made of a functional material on the surface thereof. The functional material has a property capable of expressing or improving biochemical, mechanical, electrical, magnetic, optical, or thermal properties, and includes at least one organic material, inorganic material, organic-inorganic composite material, and these A mixture of two or more of the same or different materials. Functional materials include biocompatible materials, substances that absorb or scatter ultraviolet rays, pigments, dyes, infrared absorbers, electromagnetic wave or radiation absorbers, and various phosphors. Here, in the present invention, the “biocompatible material” refers to a material that is not toxic to a living body and does not cause a biological reaction.
Examples of preferred biocompatible materials include hydroxyapatite, polysaccharides and derivatives thereof, dextran and derivatives thereof, polymer materials having carboxyl groups and amino groups, and copolymers of polyolefins and polymers having the above functional groups. As mentioned. Examples of inorganic materials that can be used as the coating layer include metal oxides, metal borides, metal silicides, metal carbonates, metal sulfates, metal nitrides, metal carbides, and metal sulfides. Specific examples of inorganic materials include metals such as Ni, Cu, Cr, Al, gold, platinum, silver, titanium oxide (titanium white), zinc oxide, iron oxide (bengala, yellow iron oxide, iron black, ultrafine particle oxidation Iron), lead oxide, aluminum oxide, zirconium oxide, selenium oxide, strontium aluminate, manganese-doped zinc silicate, cerium-doped yttrium silicate, rare earth silicate, etc., aluminum hydroxide, titanium nitride, zirconium nitride, silicon carbide, Examples thereof include silicon nitride, boron carbide, and boron nitride.
The thickness of the coating layer is from the molecular order (about 1 nm) to several microns, but an optimum thickness can be selected depending on the type of functional material, the fine particle diameter, and the application field.

(2) Magnetic powder As a magnetic powder as a raw material for producing magnetic beads, ferromagnetic materials (magnetic materials having spontaneous magnetization such as ferromagnetism and ferrimagnetism) and other magnetic materials (see JP 2001-114901 A) can be used. However, a soft magnetic material is preferable. Soft magnetic materials are materials with small residual magnetization that remain after the application of a magnetic field is removed, and magnetic powders composed of such materials reduce the magnetic aggregation between particles in the process of washing and regenerating. Easy to clean. Of the soft magnetic materials, a material called soft ferrite is particularly preferable. Examples of the soft ferrite include manganese zinc ferrite and nickel zinc ferrite. The amount of magnetic powder used is preferably 1 to 90 parts by weight, more preferably 5 to 50 parts by weight, based on 100 parts by weight of the polymer.

(3) Polymer An organic polymer or an inorganic polymer can be used as the polymer that wraps the magnetic powder. As the organic polymer, a thermosetting resin or the like can be used, but a thermoplastic resin can be preferably used from the viewpoint of production.
Examples of the thermoplastic resin include polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyamides, particularly various nylons such as nylon 6, nylon 66, nylon 610, nylon 612, nylon 11, nylon 12, nylon 46, polyesters such as polyethylene. Terephthalate, polycarbonate, polymethyl methacrylate, polytetrafluoroethylene, polyvinylidene fluoride, polyvinyl acetate, polyacetal, polysulfone, polystyrene, methyl acrylate / methyl methacrylate copolymer, acrylonitrile / styrene copolymer, ethylene / vinyl acetate copolymer ( EVA), ethylene / acrylic acid copolymer, ethylene / propylene copolymer, ABS resin (acrylonitrile / butadiene / styrene copolymer) Rimmer), thermoplastic elastomer, for example, a styrene-butadiene copolymer and the like.

(4) Magnetic Bead Manufacturing Method The magnetic beads used in the present invention are encapsulated in a polymer in accordance with a spherical composite powder manufacturing method (Japanese Patent Laid-Open No. 2001-114901) previously developed by one of the inventors. It can be produced as spherical composite particles. The method is characterized in that a composition comprising a thermoplastic resin and magnetic powder is heated and mixed to a temperature equal to or higher than the melting point of the composition together with a dispersion medium incompatible with the composition, dispersed as fine particles, and then cooled. To do. Thereby, magnetic beads of 0.1 μm or more and 300 μm or less can be easily obtained.

(5) Filter medium layer (filter layer)
Provide a fluid-permeable member (support) that allows fluid to pass but not magnetic beads (filter medium) between the lower (or bottom) of the fluid chamber or between the fluid chamber and the clean fluid chamber. (I.e., on the fluid chamber side), a filter medium layer (filter layer) filled with magnetic beads is formed.
The thickness of the filter medium layer (filter layer) can be appropriately selected. In order to perform uniform filtration, the filter medium layer is 50 to 5000 times, preferably 50 to 500 times the average particle diameter of the magnetic beads.

(6) Fluid permeable member (support)
The material of the fluid permeable member (support) is not particularly limited. Metal fiber meshes, ceramic sintered bodies, glass fibers, polyethylene fibers, polypropylene powder sintered bodies, cellulose fibers, and the like can be used. The size (opening) of the mesh of the support is about 0.1 to 0.8 times the minimum particle diameter of the magnetic beads so that the magnetic beads filled in the filter medium layer do not flow out.

(7) Upper fluid permeable member (baffle plate)
It is preferable to attach an upper fluid permeable member (baffle plate) for preventing the filter medium outflow to the upper part of the fluid chamber so that the filter medium layer is not disturbed when the raw material fluid is introduced into the filtration device. Alternatively, the upper fluid-permeable member (baffle plate) may be disposed immediately above the filter medium layer and fixed so as to press down the entire filter medium layer.

(8) Raw material fluid and solid substance contained in the raw material fluid The raw material fluid (liquid or gas) applicable to the present invention is not particularly limited as long as it does not dissolve or damage the magnetic beads. Moreover, the solid substance contained therein may be inorganic or organic. Examples of the raw material fluid containing such a solid substance include tap water containing submicron to micron grade solid substances (iron rust, foreign matters, other impurities), contaminated water containing gonococci such as yeast, bacteria, and viruses. Cell disruption fluid containing blood cells including blood cells such as erythrocytes, leukocytes, platelets, etc., cell organelles such as nuclei, mitochondria, lysosomes and undisrupted complete cells (primary to secondary treatment) There are later sewage, paint materials containing large particles, domestic wastewater, industrial wastewater, various exhaust gases, and polluted air.
The viscosity of the fluid raw material is not particularly limited, if it is liquid is preferably ^{2.0 × 10 -4 ~1Pa · s,} 2.0 × 10 -4 ~1.0 × 10 -2 Pa · More preferably, it is s.

(9) Operating pressure The operating pressure in the treatment method of the present invention or the pressure applied to the apparatus is a pressure suitable for each method and apparatus. Normal pressure, increased pressure, or reduced pressure can be selected as appropriate. In order to increase the filtration rate, operation under pressure or reduced pressure is preferred.

(10) Washing the filter medium or re-forming the filter medium layer When the filtration / filtration operation is continued, the filter medium layer is clogged with solid substances, and the filtration speed decreases. Therefore, the magnetic beads (filter material layer with a solid substance) of the filter medium layer that has become clogged are suspended in the washing liquid, and the magnetic beads are separated from the magnetic beads as the filter medium by using the magnetic attraction force, and the magnetic beads are washed. The resulting magnetic beads can be reused to form the filter media layer (again) and the filter / filter operation can continue.
Various cleaning methods can be used, such as a method of backwashing with a cleaning solution, a method of stirring in a cleaning solution (stirring with a stirring blade, aeration stirring, overturning stirring, etc.), ultrasonic cleaning, and the like. .

First, an example of manufacturing magnetic beads is shown.
<Production example of magnetic beads>
1 kg of Daiamide 1640 (nylon 12) manufactured by Daicel Chemical Industries, Ltd. and 300 g of manganese zinc ferrite fine powder manufactured by Sakai Chemical Co., Ltd. are weighed, and polyethylene glycol P20,000 as a dispersion medium (manufactured by Sanyo Chemical Industries Co., Ltd.). 1.3 kg was added and mixed well, and further mixed in a biaxial pressure kneader while uniformly heating to 230 ° C. to obtain a mixture containing soft ferrite-encapsulated nylon fine particles in the dispersion medium. Next, after the obtained mixture was cooled to about 150 ° C., it was charged and mixed in 20 liters of water (developing solvent) to obtain a suspension of a soft ferrite-encapsulated nylon composite. Soft ferrite-encapsulated nylon composites (magnetic beads) were separated by centrifugation and filtration, and heated and dried to obtain true spherical magnetic beads with a particle size of 80 ± 10 μm.

Hereinafter, the present invention will be described more specifically with reference to the accompanying drawings.
FIG. 1 is a schematic configuration diagram of a filtering device / filtering device according to a first embodiment of the present invention. As shown in the drawing, the filtration device / filtration device 1 includes a fluid chamber 4 to be treated, a filter material layer 11 provided in a lower portion of the fluid chamber 4 to be treated, and a fluid-permeable member (support) that supports the filter material layer 11. 9, a clean fluid chamber 5 provided below the fluid permeable member 9, and an electromagnet 8. The filter medium layer 11 is densely filled with magnetic beads (filter medium) having a uniform particle diameter. Further, an upper fluid permeable member (baffle plate) 10 is disposed in the upper part of the fluid chamber 4 to be processed, and a solid substance recovery port 14 is provided in a slightly lower wall portion.
The raw material fluid (for example, tap water) including the solid material (for example, foreign matter) 7 that has flowed from the fluid supply port 12 passes through the upper fluid permeable member (baffle plate) 10 as it is, and the solid material 7 of the raw material fluid is filtered. Only the clean fluid is captured by the layer 11 and discharged from the clean fluid discharge port 13 through the clean fluid chamber 5. When the filtration is continued, the filter medium layer 11 is gradually clogged, and the filtration rate gradually decreases.

Therefore, in order to cancel the decrease in the filtration rate, the filter medium layer 11 of the filter / filter is washed. For example, when the treated fluid supply port 12, the clean fluid discharge port 13, and the solid material recovery port 14 are closed and the electromagnet 8 is energized and magnetized, the entire filtering device / filtering device is turned upside down and shaken. The filter media (magnetic beads) 6 that have captured the solid substance 7 are separated, and the magnetic beads 6 are attracted by the electromagnet 8 so that the solid substance 7 is uniformly suspended and dispersed in the medium. If the plug of the solid substance recovery port 14 is taken, the solid substance 7 is obtained (FIG. 2).
Then, if the top of the filter / filter is returned to the original state, the energization of the electromagnet 8 is stopped, and the raw material fluid is supplied from the treated fluid supply port 12, the same state as the beginning (in the case of tap water) Under the water pressure).

Instead of the electromagnet, a separate permanent magnet that is not fixed to the fluid chamber to be treated may be used, and the permanent magnet may be brought close to the fluid chamber to be treated during cleaning to attract the magnetic beads. In addition, instead of overturning the entire filtering device / filtering device, reverse cleaning or the like by switching the fluid flow path may be used.
Further, when the specific gravity of the magnetic beads to be used is smaller than the specific gravity of the raw material fluid, it is possible to perform the filtration with the top of the filter / filter device upside down. In this case, the flow direction of the raw material fluid is It becomes an upward flow.

FIG. 3 is a schematic configuration diagram of a horizontal type suitable for the case where the fluid is a gas such as polluted air or exhaust gas in the filter / filter of the second embodiment according to the present invention. In this case, the filtering device / filtering device can be arranged upright in the vertical direction as shown in FIG. 1, but can also be used in the horizontal direction as shown in FIG. In this case, the flow direction of the raw material fluid (gas) is a horizontal flow.
Furthermore, when the raw material fluid is a gas, it is possible to omit a clean fluid chamber that is clearly partitioned.

FIG. 4 is a schematic configuration diagram of the filter / filter device of the third embodiment according to the present invention. When the solid substance to be filtered (or filtered) is of a very small submicron class, the particle size of the magnetic beads to be used is also reduced, and the opening of the fluid-permeable member (support) that does not allow this to flow out ( Naturally, the size of the hole is also reduced. If it does so, while the filtration resistance of a fluid permeable member will become large, the clogging in a fluid permeable member will also arise. This is a filter / filter device that has been devised to prevent this.
As shown in FIG. 4, between the filter medium layer 11 filled with magnetic beads and the fluid permeable member 9, another magnetic bead that is larger, heavier, and has a uniform particle diameter than the magnetic beads is densely packed. The underlay layer 15 is formed. Since the particle size of the magnetic beads in the underlay layer 15 can be about eight times that of the magnetic beads in the filter medium layer 11, the opening of the fluid permeable member can be made coarser and the filtration resistance can be reduced. .

If a plurality of the filtering devices / filtering devices in FIG. 1 or FIG. 4 are connected, a multi-stage filtering device or a classification device (sieving device) can be obtained. FIG. 5 is a schematic configuration diagram of a multistage filter / classifier (fourth embodiment) in which the filter / filter of FIG. 1 (first embodiment) is connected in series in three stages. However, the particle diameter of the magnetic beads filled in each filter medium layer is larger on the upstream side than on the downstream side.
The fluid chamber to be processed and the clean fluid chamber at the lower stage may be combined to form a common chamber (that is, the clean fluid discharge port is not provided in the middle except for the clean fluid discharge port at the lowermost stage). .

The materials of the fluid chamber 4 and the clean fluid chamber 5 are not particularly limited, but glass, ceramics, stainless steel, plastics, and the like are preferably used from the viewpoint of corrosion resistance and pressure resistance. Moreover, you may provide a viewing window in the to-be-processed fluid chamber 4 and the clean fluid chamber 5 so that the state of filtration can be observed. The installation position of the solid substance recovery port 14 can also be appropriately selected.
In addition, when using an electromagnet as a magnet, you may arrange | position one or two or more electromagnets discontinuously in the outer surface of the to-be-processed fluid chamber 4, and the removable ribbon-shaped electromagnet may be to-be-processed to the to-be-processed chamber 4. You may arrange | position so that it may stick to the inner surface of.

Next, an experimental example using the filter / filter of the present invention is shown.
(Experimental example) Removal of excessive particles in paint The magnetic beads are magnetic beads obtained in the previous production example (spherical particles in which 30 parts by weight of soft ferrite is contained in 100 parts by weight of nylon 12), and the particle size The one with 80 ± 10 μm was used. In addition, as the filtration device / filtration device, a device corresponding to FIG. 1 (first example) (however, the fluid chamber to be treated has a cylindrical shape with a diameter of 30 mm and the thickness of the filter medium layer is 2 mm) was used. As the raw material liquid, a suspension of inorganic pigment fine powder for paints containing oversized particles (10 μm or more) was used.
When the raw material liquid was supplied to the filtration device / filtration device and filtered, it was observed that excessive particles of 10 μm or more were captured by the filter medium layer.

It is a figure explaining the state at the time of raw | natural water processing with the filter / filter apparatus (schematic block diagram) of 1st Example which concerns on this invention. It is a figure explaining the overturn stirring and backwashing in the filtration apparatus / filtration apparatus of 1st Example, and collection | recovery of a solid substance. FIG. 6 is a schematic configuration diagram of a horizontal type suitable for the case where the fluid is a gas in the filter / filter of the second embodiment according to the present invention. It is a schematic block diagram of the filtration apparatus / filtration apparatus of 3rd Example which concerns on this invention. It is a schematic block diagram of the multistage filtration apparatus / classification apparatus (4th Example) which concerns on this invention.

Explanation of symbols

1, 1a, 1b, 1c Filtering device (filtering device)
2 Filtering device (filtering device)
3 Multi-stage filter (classifier)
4 Fluid chamber 5 Clean fluid chamber 6 Magnetic beads (filter medium)
7 Solid substances (suspended or floating solid substances)
8 Magnet (electromagnet)
9 Fluid-permeable member (support plate)
10 Upper fluid permeable member (baffle plate)
11 Filter media layer (filter layer)
12 Processed fluid supply port 13 Clean fluid discharge port 14 Solid material recovery port 15 Underlay layer

Claims (15)

A fluid chamber to receive a raw material fluid containing a solid substance;
A filter medium layer provided in a lower portion of the fluid chamber;
A fluid permeable member that supports the filter media layer;
A filtration device comprising a clean fluid chamber provided below the fluid permeable member,
A filter device in which the filter medium layer is closely packed with magnetic beads.   The filtration device according to claim 1, wherein the fluid chamber to be treated, the filter medium layer, the fluid permeable member, and the clean fluid chamber are integrated.   Furthermore, the filter apparatus of Claim 1 or Claim 2 which attached the magnet.   The filtration device according to any one of claims 1 to 3, wherein magnetic beads having a uniform bead diameter (D) are used.   Between the magnetic beads having the same bead diameter (D) and the fluid permeable member, an underlay layer is formed that is densely filled with another magnetic bead having a larger bead diameter than the magnetic beads. The filter apparatus as described in any one of Claims 1-4.   The filtration device according to any one of claims 1 to 5, wherein an upper fluid-permeable member for preventing magnetic beads from flowing out is attached to an upper portion of the processing fluid chamber. A multi-stage filtration device in which a plurality of the filtration devices according to any one of claims 4 to 6 are connected,
A filtration device in which the bead diameter of the magnetic beads packed in the filter medium layer of each stage is larger on the upstream side than on the downstream side.   The filtration device according to any one of claims 1 to 7, wherein the raw material fluid is a liquid.   The filtration device according to any one of claims 1 to 7, wherein the raw material fluid is a gas. By densely filling magnetic beads on a fluid-permeable member that allows fluid to pass but not magnetic beads, the inter-bead gap is about one-eighth of the diameter (D) of the magnetic beads (D / 8). A filter medium layer forming step of forming a filter medium layer having a size of), and a solid material trapped in the filter medium layer by passing a raw material fluid containing a solid substance larger than the inter-bead gap pores through the filter medium layer, and the filter medium A separation process that separates the clean fluid that has passed through the layers,
A processing method of a raw material fluid characterized by including in this order.   The processing method according to claim 10, wherein magnetic beads having a uniform bead diameter (D) are used. In a processing method for separating a raw material fluid containing a solid substance having a minimum particle size of d to be captured into the solid substance and a clean fluid,
A filter medium layer forming step of forming a filter medium layer by densely filling magnetic beads having a bead diameter of about 8d on a fluid permeable member that allows fluid to pass but does not pass magnetic beads, A separation step of separating the solid material trapped in the filter medium layer and the clean fluid that has passed through the filter medium layer through the filter medium layer,
A method for treating a raw material fluid, which is performed in this order. The filter medium layer that has captured the solid substance is suspended in the cleaning solution, and the magnetic attraction force is used to divide it into magnetic beads and solid substance.
The processing method according to any one of claims 10 to 12, wherein the obtained magnetic beads are reused as a filter medium.   The processing method according to claim 10, wherein the raw material fluid is a liquid.   The processing method according to claim 10, wherein the raw material fluid is a gas.

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