JP2005074371A - Adsorbent continuous supply/discharge type high-gradient magnetic separation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-gradient magnetic separation apparatus and a method therefor which are suitable for continuous treatment. <P>SOLUTION: This high-gradient magnetic separation apparatus is constituted so that a cylindrical magnet 12 is arranged to surround the periphery of a cylindrical separation tank 11 coaxially, a magnetic material particle is supplied as an adsorbent from a weak magnetic force position at the upper end of the separation tank, the supplied magnetic material particle is attracted to a ferromagnetic force position at the lower end of the separation tank and the attracted magnetic material particle is withdrawn from the lower end of the separation tank to the outside of an uneven magnetic field being the outside of the separation tank by a screw conveyer 13. The magnetic material particle is brought into countercurrent contact with a fluid to be treated in the uneven magnetic field in the separation tank 11 so that an object which is to be separated and is contained in the fluid to be treated is stuck to the magnetic material particle. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an adsorbent continuous supply / discharge type high gradient magnetic apparatus that separates an object to be separated from a fluid to be processed using a non-uniform magnetic field having a high magnetic field gradient portion and a low magnetic field gradient portion.

  Collecting and removing separated objects in fluids using magnetism has long been performed. For example, the wastewater or circulating water of an ironworks is brought into contact with a powerful magnet, and an object to be separated such as iron powder contained therein is recovered.

  Conventional high-gradient magnetic separation methods mainly consist of a fine network made of magnetic metal rolled into a sachet as an adsorbent for attaching an object to be separated, or a multi-layered disk-shaped network. It was used for. Patent Document 1 (Japanese Patent Application Laid-Open No. 11-300120) also proposes a technique using a porous ball as an adsorbent for adhering an object to be separated.

  However, as a result of intensive studies based on experiments by the present inventors, it has been found that the following problems remain in high gradient magnetic separation.

  That is, in high gradient magnetic separation, it is necessary to use a non-uniform magnetic field of Tesla order. For this reason, the adsorbent is firmly restrained in the magnetic field, and the adsorbent cannot be removed from the magnetic field and washed without demagnetization. Moreover, as a device for generating a Tesla order magnetic field, there is currently only a superconducting magnet that requires a certain amount of time for excitation and demagnetization.

Therefore, the conventional high gradient magnetic separation technology requires excitation and demagnetization of the magnetic field when the adsorbent is taken out from the magnetic field, and continuous processing that can be used as an actual application is impossible. This problem also applies to the technique described in Patent Document 1 that appears to be capable of continuous processing at first glance.
JP-A-11-300120

  Accordingly, a main object of the present invention is to provide an adsorbent continuous supply / discharge type high gradient magnetic separation apparatus and method which can continuously supply and discharge adsorbents and is suitable for continuous processing.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An adsorbent having magnetism;
Magnetic field generating means for generating a non-uniform magnetic field having a high magnetic field gradient portion and a low magnetic field gradient portion;
Means for supplying the adsorbent into the non-uniform magnetic field without weakening the non-uniform magnetic field;
Means for bringing the adsorbent and the fluid to be processed into contact with each other in the non-uniform magnetic field, and attaching an object to be separated contained in the fluid to be processed to the adsorbent;
A means for extracting the adsorbent to which the separation object is attached to the outside of the non-uniform magnetic field without weakening the non-uniform magnetic field;
A high-gradient magnetic separator characterized by that.

(Function and effect)
According to the present invention, it is possible to supply an adsorbent to which an object to be separated is attached into the non-uniform magnetic field and to extract the supplied adsorbent without weakening the non-uniform magnetic field (including demagnetization). Accordingly, it is possible to continuously extract the adsorbent to which the separation object is attached from the inside of the non-uniform magnetic field and continuously return it to the non-uniform magnetic field while maintaining the separation effect by the high gradient magnetic field. .

  The “separated object” as used in the present invention includes not only those that are inherently magnetic, but also those in which the magnetism of a weak magnetic material is increased or those that are magnetized by a non-magnetic material.

<Invention of Claim 2>
The adsorbent continuous supply according to claim 1, wherein the adsorbent is supplied to a weak magnetic force site with respect to the non-uniform magnetic field, and the contact is performed in a process in which the supplied particles move to the strong magnetic force site. Exhaust type high gradient magnetic separator.

(Function and effect)
Within a non-uniform magnetic field, there is a relative strength of the magnetic force. Accordingly, when the adsorbent is supplied to the weak magnetic force site, the adsorbent automatically moves to the strong magnetic force site by the magnetic force. The invention described in claim 2 makes use of this to make contact with the fluid to be treated in the process of moving the adsorbent particles. By adopting such a configuration, a moving bed of adsorbent particles is formed, and moving bed type separation becomes possible. It is also possible to move the adsorbent particles toward the discharge position to the outside of the magnetic field, for example, by simply feeding the adsorbent particles to the weak magnetic force site. It should be noted that this advantage can be obtained without weakening the inhomogeneous magnetic field required for magnetic separation.

<Invention of Claim 3>
The adsorbent continuous supply according to claim 1 or 2, wherein the adsorbent in the strong magnetic force portion is guided to the weak magnetic force portion by mechanical force, moved through the weak magnetic force portion, and extracted out of the non-uniform magnetic field. Exhaust type high gradient magnetic separator.

(Function and effect)
Since the adsorbent at the strong magnetic force site is firmly restrained at the position, it is very difficult to extract it from the non-uniform magnetic field. However, according to the invention described in claim 3, the attracting body is guided to the weak magnetic force site by the mechanical force and moved through the weak magnetic force site (position where the attracting body is not substantially affected by the nonuniform magnetic field). By pulling out, the adsorbent can be extracted from the non-uniform magnetic field with less mechanical force.

<Invention of Claim 4>
The adsorbent continuous supply / discharge high gradient magnetic separation device according to claim 3, configured to prevent the moving adsorbent from going backward in a direction opposite to a moving direction for the extraction.

(Function and effect)
When the adsorbent is extracted from the magnetic field to the outside of the magnetic field, a force attracted to the magnetic field is exerted on the adsorbent. For this reason, it is difficult to efficiently extract the adsorbent in the magnetic field out of the magnetic field with an extraction machine having a structure such as a screw conveyor. For this reason, as described in this claim, it is desirable that the adsorbent be prevented from going backward in the direction opposite to the moving direction for extraction.

<Invention of Claim 5>
The continuous supply / discharge high gradient magnetic separation apparatus according to claim 3 or 4, further comprising means for breaking the aggregate of the adsorbent prior to or in the process of extracting the adsorbent by mechanical force.

(Function and effect)
It is known that when an adsorbent having a large number of magnetisms is placed in a strong magnetic field, the adsorbents are magnetized to each other and behave as a large aggregate (cluster). As a result of this assembly, the flexible movement of the adsorbent is suppressed, making extraction difficult. For this reason, it is very effective to provide a mechanism that breaks (or unravels) the aggregated adsorbent prior to or in the process of extraction when performing extraction by mechanical force as described above. is there.

<Invention of Claim 6>
The adsorbent continuous supply / discharge high-gradient magnetism according to any one of claims 1 to 5, wherein the adsorbent is a spherical non-porous magnetic particle having an average particle diameter of 0.3 to 3.0 mm. Separation device.

(Function and effect)
When non-porous magnetic particles are used as the adsorbent, many of the magnetic particles in a non-uniform magnetic field form an aggregate (there may be a single aggregate or a plurality of such aggregates). As a result of this aggregate becoming a densely packed adsorbent, the contact efficiency with the fluid to be processed becomes high, and the processing efficiency becomes very high.

  Moreover, this aggregate is not indissociable outside the magnetic field. Therefore, it is possible to return to the state in which the original particles are dissociated again by demagnetization, or the particle surface inside the aggregate can be cleaned by mechanical cleaning. Therefore, unlike conventional nets and porous balls, magnetized objects to be separated Removal can be significantly facilitated.

  Since the size of the magnetic particles is determined by the size of the separation target and the relationship with the outer shape of the magnetic particles, it cannot be said unconditionally, but in the case of spherical particles, if the average particle size is larger than 3.0 mm, the porosity is As a result, the pressure loss of the fluid passing through the particle gap is reduced, so that drift is likely to occur and the adsorption state becomes non-uniform. In addition, high gradient magnetic separation is capable of high-speed water passage due to its characteristics, and high-efficiency processing is possible, but in such a case, if the porosity is high, the contact efficiency between the particles and the fluid to be treated decreases. It is preferable that the average particle size is 3.0 mm or less and the porosity is as low as possible. On the other hand, if the particle diameter is larger than 3.0 mm, the specific surface area becomes small and the adsorption efficiency is lowered.

  On the other hand, if the average particle size of the magnetic particles is smaller than 0.3 mm, not only does the fluid passing pressure loss in the particle gap increase, but the magnetic particle aggregate becomes too dense and the contact between the fluid and the particles is reduced. It becomes uneven.

  Therefore, in the present invention, it is preferable to use magnetic spherical particles having an average particle diameter of 0.3 to 3.0 mm. When the magnetic particles in such a range are aggregated, they have a specific surface area comparable to that of a porous material or the like, and the effects of the above-described aggregation of magnetic particles are more reliably exhibited.

<Invention of Claim 7>
The adsorbent continuous supply / discharge high gradient magnetic separator according to any one of claims 1 to 6, wherein the adsorbent is made of ferritic stainless steel or martensitic stainless steel.

(Function and effect)
An adsorbent made of such a material can be easily used in the present invention because it easily generates a magnetic gradient due to convergence of magnetic flux lines and has high mechanical and chemical durability.

<Invention of Claim 8>
The adsorbent continuous supply / discharge high gradient magnetic separator according to any one of claims 1 to 7, wherein the magnetic field generating means applies a magnetic field of 1 Tesla or more.

(Function and effect)
In the high gradient magnetic separation of the present invention, it is desirable to apply such a magnetic field.

<Invention of Claim 9>
A separation tank is provided, and after the adsorbent and the fluid to be treated are brought into contact with each other in the separation tank, the adsorbent to which the object to be separated is attached is extracted out of the separation tank and washed, and the adsorbent is covered with the adsorbent. The adsorbent continuous supply / discharge high gradient magnetic separation apparatus according to any one of claims 1 to 8, wherein the separation object is removed and then returned to the separation tank.

(Function and effect)
As described above, the present invention is suitable for the case where the adsorbent is circulated through the cleaning process because of high processing efficiency and good separation of the object to be separated from the adsorbent, and in this case, substantially continuous. High gradient magnetic separation is also possible. In addition, “substantially continuous high gradient magnetic separation” means that the contact process between the adsorbent and the fluid to be processed is not interrupted by a delay in the cleaning process, and a part of the cleaning process, etc. Includes cases where processing is intermittent. Needless to say, it is preferable to perform all of the series of processes continuously or at a pace similar to this in terms of efficiency.

<Invention of Claim 10>
The to-be-separated object high gradient magnetic separation apparatus of any one of Claims 1-9 comprised so that a contact with the said adsorption body and to-be-processed fluid might be performed by countercurrent contact.

(Function and effect)
In the present invention, a so-called countercurrent contact system is suitable as a contact form between the adsorbent and the fluid to be processed. However, since the object to be separated is adsorbed on the surface of the adsorbent, it can be used sufficiently even in cocurrent contact.

  As described above, according to the present invention, a high gradient magnetic separation apparatus and method suitable for continuous processing are provided.

Hereinafter, the embodiment of the present invention will be described in detail by taking as an example the case of using magnetic particles as an adsorbent.
<Overview>
FIG. 1 shows a basic flow of a preferred embodiment of the present invention. In the example of the figure, first, a minute amount of non-magnetic or weak magnetic component in the fluid to be treated is pretreated, and magnetism is given to a level that can be separated in the subsequent high gradient magnetic separation to obtain a material to be separated. This pretreatment is not essential in the present invention (details will be described later). When the separation target has sufficient magnetism, the fluid to be treated can be supplied to the high gradient magnetic separation device 1 without performing pretreatment.

  An adsorbent continuous supply / discharge type high gradient magnetic separation device (hereinafter simply referred to as a high gradient magnetic separation device) 1 includes a high gradient magnetic separation unit 1A and a cleaning device 1B. In the high gradient magnetic separation unit 1A, a non-uniform magnetic field having a high magnetic field gradient portion and a low magnetic field gradient portion is formed, and magnetic particles (corresponding to an adsorbent) are supplied into the magnetic field, and the supplied magnetic material The fluid to be treated is brought into contact with the particles, and in the process, the separation object to be separated adheres to the magnetic particles. The magnetic particles are extracted from the non-uniform magnetic field and supplied to the cleaning device 1B when the amount of the adhered object increases to some extent. On the other hand, the separation target separation object is gradually removed according to the contact time with the magnetic particles, and after being removed to some extent, the fluid to be treated is taken out of the system as a treated fluid.

  The magnetic particles supplied to the cleaning apparatus 1B are subjected to an appropriate cleaning process such as ultrasonic cleaning, and the attached separation object is washed away. Although depending on the adhesion of the object to be separated, it is usually desirable to carry out an appropriate demagnetization treatment prior to or during the cleaning. The magnetic particles that have been cleaned are returned to the high gradient magnetic separation unit 1A again. On the other hand, the objects to be separated that have been washed off are discharged out of the system from the washing apparatus 1B.

  Characteristically, in the present invention, the supply and discharge of the magnetic particles with respect to the inhomogeneous magnetic field is performed without weakening the inhomogeneous magnetic field. Therefore, continuous high gradient magnetic separation can be achieved in combination with recycling of the magnetic particles.

<First Embodiment of Magnetic Separation Unit>
FIG. 2 shows a separator unit example 10 corresponding to the magnetic separator 1 in the basic flow. The separation device 10 includes a cylindrical magnet 12 and a substantially cylindrical separation tank 11 arranged so as to extend coaxially from an appropriate position above the magnet 12 to a central portion in the longitudinal direction of the inner space. .

  The cylindrical magnet 12 as the magnetic field generating means can be used regardless of the type, such as a permanent magnet, an electromagnet, or a superconducting magnet, but as described above, the one that can apply a magnetic field of 1 Tesla or more is preferably used.

  The separation tank 11 has a funnel-shaped particle aggregate portion 11b at the lower end portion and a cylindrical shaft portion 11c that occupies a radial center portion from an appropriate position on the upper side to the upper end. The upper end opening of the separation tank 11 is a supply / discharge port 11a communicating between the outer surface of the shaft portion and the inner wall surface of the separation tank 11, and this supply / discharge port 11a is not shown via the particle supply pump p1. In addition to communicating with the particle exit side of the aforementioned cleaning device, it communicates with the treated fluid discharge path r1. On the other hand, a fluid supply unit (not shown) is provided on the side surface of the particle assembly portion 11b, and the lower end opening of the particle assembly portion 11b is a particle discharge port. The introduction port of the screw conveyor 13 communicates with the particle discharge port. It is connected. The screw conveyor 13 extends coaxially along the central axis of the cylindrical magnet 12 from the longitudinal center of the cylindrical magnet 12 to an appropriate position below the cylindrical magnet 12, and the lower end discharge port is It is connected in communication with the particle entrance side of the above-described cleaning device via the discharge pump p2.

  The particle discharge pump p2 is for extracting the magnetic particles in the separation tank 11 and feeding them to the cleaning apparatus, and the supply pump p1 is for returning the cleaned particles sent from the cleaning apparatus to the separation tank 11 Is. As these pumps, a snake type pump can be suitably used, and a diaphragm type pump can also be used depending on conditions.

  On the other hand, in the present invention, the separation tank 11, the shaft portion 11 c, the screw conveyor 13, various pipes for conveying particles and fluid, etc. may be made of a magnetic metal, but the magnetization of glass or synthetic resin, etc. The one with the lower rate is preferable.

  The magnetic particles can be used regardless of the particle diameter, material, etc., but non-porous spherical particles having an average particle diameter of 0.3 to 3.0 mm are suitable as described above. The material is ferromagnetic and has high mechanical durability such as wear and deformation, and high chemical resistance such as corrosion. Specifically, ferritic stainless steel represented by SUS430 and martensitic stainless steel. Is preferred.

  In the separation device 10 thus configured, a non-uniform magnetic field is formed in the separation tank 11 by the cylindrical magnet 12. In the longitudinal direction of the cylindrical magnet 12, this non-uniform magnetic field has a relatively strong magnetic force at the central portion and a weak magnetic force at both ends compared to this. In the radial direction, the closer to the center, the weaker the magnetic force.

  Therefore, the particles sent to the upper end portion of the separation tank 11 by the particle supply pump p1 hit the weak magnetic force site in the longitudinal direction of the cylindrical magnet 12, so that they are magnetic toward the lower end portion of the separation tank 11 corresponding to the strong magnetic force site. Moved by force. Therefore, in the present embodiment, the magnetic particles supplied into the separation tank 11 constitute a moving layer from the upper end to the lower end of the separation tank 11. In this embodiment, the moving layer is composed of an aggregate in which many magnetic particles are aggregated.

  At the lower end of the separation tank 11, the inner wall surface side of the separation tank 11 is a strong magnetic force site. For this reason, in this embodiment, by making the lower end part of the separation tank 11 into a funnel shape, the particles can be gathered at the central portion that has a relatively weak magnetic force in the radial direction. The particles that have reached the particle assembly portion 11b are extracted by the screw conveyor 13 to a position that is not substantially affected by the cylindrical magnet 12 only through the weak magnetic force portion (the central portion in the radial direction).

  On the other hand, a non-processing fluid is supplied to the lower end portion of the separation tank 11 and flows in the direction opposite to the moving direction of the moving bed. As a result, the separation object contained in the fluid to be treated is sequentially attached to the surface of the magnetic particles. That is, the magnetic substance particles constituting the moving layer have a larger amount of separation object as the particles are at the lower end, and the content of the separation object as the treatment fluid is at the lower side. As a result, the fluid to be treated is sequentially passed and contacted from the layer made of magnetic particles having a high degree of contamination to the layer made of magnetic particles having a low degree of contamination, thereby enabling efficient separation. The fluid to be processed that has passed through the moving bed is separated from the supply particles by an overflow or the like from the supply / discharge port 11a at the upper end of the separation tank 11, and is taken out of the system as a processed fluid.

  On the other hand, the magnetic particles extracted out of the separation tank 11 by the screw conveyor 13 are supplied to a cleaning device (not shown) by the discharge pump p2. In the cleaning process, the demagnetization process can return the particle aggregate to a state separated from the individual particles, and the entire particle surface can be easily cleaned. Even without demagnetization treatment, the particle aggregate is an aggregate of particles due to magnetic force, and can be said to be a fluid, so it can be washed with an appropriate cleaning brush or the like. The entire surface of the particles can be cleaned. The particles after the cleaning process are circulated and supplied to the supply / discharge port 11a at the upper part of the separation tank 11 intermittently or continuously.

  As is clear from the above description, in the apparatus 10 of this embodiment, the characteristics of the non-uniform magnetic field are effectively used, that is, the movement of the magnetic particles in the separation tank 11 using the strength of the magnetic force, and the weakness Since the discharge through the magnetic force site is performed, the magnetic particles can be supplied and discharged without weakening the cylindrical magnet 12. Then, continuous magnetic separation is achieved by combining the supply and discharge of the magnetic particles that do not weaken the magnetic field and the recycling of the magnetic particles through the cleaning device.

<Second Embodiment of Magnetic Separation Unit>
FIG. 3 shows a second embodiment of the magnetic separation device. In the apparatus 20 of the second embodiment, the lower end portion of the separation tank 21 is an inverted conical particle assembly bottom portion 21b, and is appropriately placed above the separation tank 21 from a position slightly spaced from the bottom portion 21b. The screw conveyor 23 extends coaxially so as to occupy the central portion in the radial direction up to the position. Therefore, this screw conveyor 23 has not only the function of extracting particles, but also the function of the cylindrical shaft portion 11c in the first embodiment.

  Other configurations are basically the same as those in the first embodiment. That is, the particles sent to the upper end of the separation tank 21 by the particle supply pump p1 are moved by the magnetic force toward the particle assembly bottom 21b below the separation tank 21 corresponding to the strong magnetic force site. On the other hand, a non-processing fluid is supplied to the lower end portion of the separation tank 11, and this is circulated in the direction opposite to the moving direction of the moving bed, and in this process, is in countercurrent contact with the magnetic particles in the moving bed. As a result, the separation object contained in the fluid to be treated is sequentially attached to the surface of the magnetic particles.

  The fluid to be treated that has passed through the moving bed is taken out of the system as a treated fluid from the supply / discharge port 11a at the upper end of the separation tank 21. The particles that have reached the particle assembly bottom 21b are taken into the screw conveyor 23 and are not substantially affected by the cylindrical magnet 12 only through the central portion in the radial direction of the separation tank 21 by the screw conveyor 23, that is, only through the weak magnetic force portion. It is extracted above the separation tank 21 and supplied to a cleaning device (not shown) by the discharge pump p2 for cleaning. The particles for which the cleaning process has been completed are circulated and supplied to the supply / discharge port 11a above the separation tank 21 intermittently or continuously.

  In the second embodiment, there is an advantage that the portion composed of the separation tank 11 and the screw conveyor 23 can be made compact and simplified as compared with the first embodiment.

<Third Embodiment of Magnetic Separation Unit>
In the first and second embodiments, only the upper half of the longitudinal direction of the cylindrical magnet 12 substantially contributes to the high gradient magnetic separation, and the lower half is not effectively used.

  Therefore, taking advantage of the second embodiment, separation tanks 11 and 11 and screw conveyors 23 and 23 are provided on one side and the other side with respect to the longitudinal center of one cylindrical magnet 12 as shown in FIG. Propose to provide each. In the illustrated example, the separation tanks 11 and 11 and the screw conveyors 23 and 23 are vertically symmetric with respect to the center in the longitudinal direction of the cylindrical magnet 12, but it is not necessary to be completely symmetric. In this case, a supply / discharge system for the fluid to be treated and a cleaning / circulation system for particles may be provided for each separation tank 21 or may be common as shown in the figure. Thus, the entire longitudinal direction of the cylindrical magnet 12 can be used effectively, and the processing capacity can be doubled.

<Fourth Embodiment>
At present, it is impossible to separate the non-magnetic material and the weak magnetic material as they are by the high gradient magnetic separator 1. Therefore, the present invention also proposes a facility combined with pretreatment for enabling magnetic separation of such a non-magnetic material and a weak magnetic material. Specifically, this pretreatment can be achieved by adding a predetermined ion or aggregating material to the fluid to be treated and complexing, colloiding or aggregating the components to be separated.

  FIG. 5 shows an example of pretreatment in the treatment of the liquid to be treated such as waste water. The fluid to be treated is introduced into the electrolytic layer 100 in which a plurality of pairs of iron electrodes 101 are disposed. In the first electrolysis tank 100, a predetermined voltage is applied to the iron electrode 101, and iron hydroxide is supplied into the waste water in the tank 100 through the electrolytic reaction generated thereby, and the non-magnetic in the fluid to be treated. Separation objects (such as organic substances and phosphorus in the waste water) physically adsorb with iron hydroxide. Thus, even if the object to be separated is a non-magnetic material or a weak magnetic material, the object to be separated can be magnetically separated by a later magnetic separation device by being integrated with the ferromagnetic iron hydroxide. Can do.

<Others>
(A) The fluid to be processed that is the subject of the present invention is not limited to a liquid, and may be a gas or a fluid. Further, as a separation target, not only a ferromagnetic material but also a weak magnetic material or a non-magnetic material may be used as long as it can be separated by the present invention by a pretreatment as described above. Basically, it is not affected by the size of the object to be separated or the content in the fluid to be treated.
However, the magnetic separation apparatus of the present invention is particularly suitable for separating what has conventionally been difficult to disassemble, such as trace components contained in liquid.

(B) That is, the present invention is not only for the separation of magnetic materials such as iron powder contained in industrial effluents of power plants and the like that have been subject to magnetic separation, but also for the pretreatment as described above. Can also be applied to the separation of organic substances, plants, heavy metals, etc. contained in the liquid. More specifically, it can be suitably applied to separation of trace components in food production such as separation of environmental hormones, heavy metals and algae in drainage, rivers, lakes, etc., treatment of land price advancement water in landfills, and purification of sucrose solution.

(C) When magnetic particles are recycled as in the above embodiment, the particles are continuously recycled, that is, the supply and discharge of the magnetic particles to and from the separation tank and the washing thereof are always performed continuously. The particles can be recycled as needed or intermittently at predetermined intervals.

(D) Each internal device or external device (valve / pump / pipe / motor) is spaced apart, made of non-magnetic material, or has a magnetic shielding means so as not to be adversely affected by the magnetic field of the magnet. Or a mechanism for scraping off the adhesion of magnetic particles or the like can be provided.

(E) Although the present invention is based on magnetic separation, other separation methods may be appropriately combined as pre-processing or post-processing of magnetic separation of the present invention to prevent magnetic separation or magnetic separation. What is possible can be separated. For example, in the above-mentioned magnetic separation equipment, the liquid to be treated after pretreatment is subjected to sedimentation separation treatment as necessary, and then supplied to the magnetic separation device, or the liquid treated by the magnetic separation device is subjected to oxidation reduction treatment Can do.

(F) The adsorbent in the present invention is particularly limited in size, material, etc., as long as it can be supplied and discharged into a non-uniform magnetic field and can be magnetically attracted by magnetic separation. is not. Therefore, for example, an adsorbent that combines a non-magnetic material and a magnetic material, such as containing (embedding) magnetic material particles in non-magnetic material particles, is also included in the present invention.

  Applicable to a wide range of uses such as wastewater purification.

It is a general | schematic flowchart of embodiment of this invention. It is a general | schematic longitudinal cross-sectional view of 1st Embodiment. It is a general | schematic longitudinal cross-sectional view of 2nd Embodiment. It is a general | schematic longitudinal cross-sectional view of 3rd Embodiment. It is a general | schematic longitudinal cross-sectional view of 4th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... High gradient magnetic separation apparatus, 1A, 10 ... High gradient magnetic separation part, 1B ... Cleaning apparatus, 12 ... Magnet, B ... Moving layer.

Claims (10)

An adsorbent having magnetism;
Magnetic field generating means for generating a non-uniform magnetic field having a high magnetic field gradient portion and a low magnetic field gradient portion;
Supply means for supplying the adsorbent into the non-uniform magnetic field without weakening the non-uniform magnetic field;
Means for bringing the adsorbent and the fluid to be processed into contact with each other in the non-uniform magnetic field, and attaching an object to be separated contained in the fluid to be processed to the adsorbent;
An extraction means for extracting the adsorbent to which the object to be separated is attached to the outside of the non-uniform magnetic field without weakening the non-uniform magnetic field;
An adsorbent continuous supply / discharge type high gradient magnetic separation device. The adsorbent continuous supply according to claim 1, wherein the adsorbent is supplied to a weak magnetic force site with respect to the non-uniform magnetic field, and the contact is performed in a process in which the supplied particles move to the strong magnetic force site. Exhaust type high gradient magnetic separator. The adsorbent continuous supply according to claim 1 or 2, wherein an adsorbent in a non-uniform magnetic field is guided to a weak magnetic force site by mechanical force, moved through the weak magnetic force site, and extracted outside the non-uniform magnetic field. Exhaust type high gradient magnetic separator. The adsorbent continuous supply / discharge high gradient magnetic separation device according to claim 3, configured to prevent the moving adsorbent from going backward in a direction opposite to a moving direction for the extraction. The continuous supply / discharge high gradient magnetic separation apparatus according to claim 3 or 4, further comprising means for breaking the aggregate of the adsorbent prior to or in the process of extracting the adsorbent by mechanical force. The adsorbent continuous supply / discharge high-gradient magnetism according to any one of claims 1 to 5, wherein the adsorbent is a spherical non-porous magnetic particle having an average particle diameter of 0.3 to 3.0 mm. Separation device. The adsorbent continuous supply / discharge high gradient magnetic separator according to any one of claims 1 to 6, wherein the adsorbent is made of ferritic stainless steel or martensitic stainless steel. The adsorbent continuous supply / discharge high gradient magnetic separator according to any one of claims 1 to 7, wherein the magnetic field generating means applies a magnetic field of 1 Tesla or more. A separation tank is provided, and after the adsorbent and the fluid to be treated are brought into contact with each other in the separation tank, the adsorbent to which the object to be separated is attached is extracted out of the separation tank and washed, and the adsorbent is covered with the adsorbent. The adsorbent continuous supply / discharge high gradient magnetic separation apparatus according to any one of claims 1 to 8, wherein the separation object is removed and then returned to the separation tank. The adsorbent continuous supply / discharge high gradient magnetic separation apparatus according to claim 1, wherein the adsorbent and the fluid to be treated are contacted by countercurrent contact.

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