JP2010036113A - Device for recovering magnetic body and jetting and stirring system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for recovering magnetic bodies which can efficiently recover the magnetic bodies from a mixture while reducing its cost and scale, and to provide a jetting and stirring system using the same. <P>SOLUTION: The device for recovering the magnetic bodies 6 includes a magnetic field generating part 9 for generating a magnetic field, a rotary belt 16 for attracting iron powder by being magnetized in the magnetic field generated by the magnetic field generating part 9, water jets 17a, 17b for eliminating soil and the like other than the iron powder attracted to the belt 16 by jetting water to the belt 16, and a blower 18 recovering the iron powder by sucking it from the belt 16 to which water is jetted by the water jets 17a, 17b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a magnetic body recovery apparatus that recovers a magnetic body from a mixture, and a jet stirring system using the same.

  Conventionally, a jet agitation method is known as a method for purifying contaminated ground. In the jet stirring method, the contaminated groundwater and the purifying material are stirred and mixed by injecting the purifying material containing iron powder (magnetic material) into the contaminated groundwater (soil) with a water jet, and the groundwater is contaminated by the reducing action of the iron powder. Is purified (see, for example, Patent Document 1). In this jet stirring method, a part of the iron powder sprayed into the contaminated ground is not mixed with the contaminated groundwater but discharged to the ground side as a mixture (slurry) containing soil, mud water, and the like.

Here, it is desirable that the iron powder contained in the mixture is reused from the viewpoint of environmental considerations and cost reduction. Then, what is described in patent document 2, for example is known as a technique which collects iron powder from soil. In the apparatus described in Patent Document 2, a mixture of contaminated soil and iron powder is carried to an iron powder collecting device by a belt conveyor, and iron powder to which harmful chemical substances contained in the soil are collected is collected by an electromagnet. .
JP 2004-16865 A JP 2003-275734 A

  However, when recovering iron powder from the mixture discharged by the jet stirring method using the above-mentioned apparatus, it is necessary to eliminate muddy water contained in the mixture, which is not efficient because the work process increases. Absent. Further, in the conventional iron powder recovery technology, it is necessary to secure an installation space for a belt conveyor and the like, and there is a problem in that the cost increases because large-scale equipment is required.

  The present invention aims to solve the above-described problems, and can reduce the cost and reduce the size of the magnetic material, and can efficiently recover the magnetic material from the mixture. It aims at providing the used jet stirring system.

  A magnetic body recovery apparatus according to the present invention is a magnetic body recovery apparatus that recovers a magnetic body from a mixture containing a magnetic body, and is under the influence of a magnetic field generation means that generates a magnetic field and a magnetic field generated by the magnetic field generation means. Rotating belt provided in a mesh shape that is provided and magnetized by a magnetic field, and fluid ejection that ejects fluid to the belt and removes the mixture other than the magnetic material adhered to the belt And a recovery means for recovering the belt by removing the magnetic material from the belt from which the mixture other than the magnetic material has been removed by the fluid ejecting means.

  In this magnetic body recovery apparatus, the magnetic body contained in the mixture is attached to a rotating belt formed in a mesh shape that is magnetized by the magnetic field generated by the magnetic field generating means. And after removing excess mixture other than the magnetic body adhering to a belt with a fluid injection means, a magnetic body is collect | recovered from a belt with a collection | recovery means. Thereby, since a magnetic body can be directly recovered from a mixture containing soil, muddy water, etc., the magnetic body can be efficiently recovered without taking the trouble of eliminating muddy water. In addition, since a series of processes from the discharged mixture to recovering the magnetic material can be performed by one apparatus, it is not necessary to arrange an apparatus such as a belt conveyor. Therefore, cost reduction and device downsizing can be achieved.

In addition, it is preferable to further include a discharge port that is provided below the belt and discharges a mixture other than the magnetic material. For example, soil particles (soil) of 0.3 to 1.3 t / m ³ are mixed in the mixture. Therefore, by providing a discharge port below the belt, it is possible to discharge without depositing soil particles in the apparatus. Thereby, even if it is a case where soil etc. are included in a mixture, a magnetic body can be collect | recovered suitably.

  In addition, it is preferable that the surface of the belt facing the inflow port into which the mixture flows is inclined in the direction away from the inflow port with respect to the vertical direction on the upper end side. With such a configuration, the contact area between the mixture and the belt becomes larger than when the surface facing the inflow port is not inclined, so that the magnetic material is easily attached to the belt. In addition, impurities such as soil other than the magnetic substance easily pass through the mesh belt. As a result, only the magnetic material can be recovered with high efficiency.

  Moreover, it is preferable that the fluid ejecting means is disposed so as to sandwich the belt so that the fluid is ejected to a surface facing the inlet of the belt and a back surface of the surface. With such a configuration, impurities such as soil particles other than the magnetic material adhering to the belt by about 30 wt% to 50 wt% can be more effectively removed (washed). As a result, only the magnetic material can be recovered with high efficiency.

  The jet stirring system according to the present invention includes a magnetic body recovery device according to claims 1 to 4, a jet pipe that jets a purification material containing a magnetic body into the contaminated soil ground, and guides the jet pipe into the contaminated soil ground. And a guide pipe that discharges the mixture containing the magnetic material discharged from the ground to the ground, and a transport line that transports the mixture discharged from the guide pipe to the magnetic material recovery device.

  In this jet agitation system, a purification material is jetted into the contaminated soil ground by an injection pipe, and the contaminated groundwater and soil are purified by the reducing action of the magnetic substance. At this time, only the magnetic material is recovered from the mixture including the magnetic material discharged to the ground side through the guide pipe and transferred by the transfer line by the magnetic material recovery device. With such a configuration, the contaminated soil ground can be purified, the cost can be reduced, the size of the magnetic body recovery device can be reduced, and the magnetic body can be efficiently recovered from the mixture. As a result, the reuse of the magnetic material is simplified, and the cost in the jet stirring system can be reduced.

  In addition, it is preferable to further include a tank that is provided on a conveyance line between the guide pipe and the magnetic body recovery device and temporarily stores the mixture discharged from the guide pipe. With such a configuration, the discharge amount of the mixture can be adjusted according to the processing capacity of the magnetic body recovery apparatus. In addition, the mixture discharged from the guide pipe may contain a volatile organic compound (VOC). Therefore, by temporarily storing the mixture in the tank before discharging it to the magnetic substance recovery device, the VOC can be adsorbed and discharged by, for example, activated carbon provided in the tank.

  According to the present invention, the cost can be reduced and the size can be reduced, and the magnetic material can be efficiently recovered from the mixture.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a magnetic body recovery device and a jet stirring system using the magnetic material recovery device according to the invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing an outline of a jet stirring system including a magnetic body recovery device. FIG. 2 is a diagram schematically showing a part of the jet stirring system. As shown in FIGS. 1 and 2, the jet agitating system 1 injects the purification material while cutting the ground in the contaminated ground, and mixes the contaminated ground and the purification material in-situ so that the contaminated portion (ground water, soil ) For the soil remediation (ENVIRO JET) method for detoxification and detoxification. The jet stirring system 1 includes a purifying material storage tank 2, a jet pipe 3, a guide pipe 4, a discharge slurry tank (tank) 5, and a magnetic body recovery device 6. The guide pipe 4 and the discharge slurry tank 5, and the discharge slurry tank 5 and the magnetic body recovery device 6 are connected by a transfer line L, respectively.

  The purification material storage tank 2 is a tank that delivers the purification material to the injection pipe 3. The purification material is a mixture of iron powder (magnetic material), thickening material (polysaccharide), and tap water. The iron powder has an ionic valence of 0 and a diameter of about 0.07 to 0.1 mm (maximum 0.5 mm), and acts as a reducing agent (reduced iron powder) for purifying contaminated groundwater.

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

  The guide pipe 4 is inserted into a hole cut toward the groundwater flow W in the contaminated ground, and guides the injection pipe 3 into the contaminated ground by passing it through the pipe. Moreover, the guide pipe 4 discharges the slurry which became surplus in the ground by the cutting of the soil by the injection pipe 3 and the injection of the purification material from the ground to the ground side. The slurry contains cut soil, a part of the purification material containing iron powder, muddy water, air, and the like.

The discharged slurry tank 5 temporarily stores the slurry discharged from the guide pipe 4. About 1 m ³ of slurry per minute is discharged from the guide pipe 4 to the discharge slurry tank 5 through the conveyance line L. The discharged slurry tank 5 includes a VOC (Volatile Organic Compound) removing device 7. The VOC removal device 7 adsorbs and removes exhaust gas such as VOC contained in the slurry by activated carbon, and releases the air after the removal treatment to the atmosphere.

The magnetic body recovery device 6 recovers iron powder from the slurry. In the magnetic body recovery device 6, a valve V <b> 1 (see FIG. 2) provided on the transfer line L that connects the magnetic body recovery device 6 and the discharged slurry tank 5 is adjusted, so that 0.3˜ About 0.5 m ³ of slurry is conveyed from the discharge slurry tank 5. In the magnetic body recovery device 6, 99% or more of the iron powder contained in the slurry is recovered. This is made clear by the inventors' tests and experiments.

  In addition, a gas-liquid separator 8 is connected to the magnetic body recovery device 6. The gas-liquid separator 8 is a device that separates the air sucked together with the iron powder collected by the magnetic material collecting device 6 and collects the iron powder. The iron powder recovered by the gas-liquid separator 8 is then reused as a purification material.

  Then, the structure of the magnetic body collection | recovery apparatus 6 is demonstrated in detail, referring FIG.3 and FIG.4. FIG. 3 is a side sectional view schematically showing the configuration of the magnetic body recovery device 6. 4 is a cross-sectional view taken along line IV-IV in FIG. In FIG. 4, illustration of the belt 16 is omitted for convenience of explanation.

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

  The magnetic field generator 9 is a part that generates a magnetic field (magnetic field). The magnetic field generator 9 is disposed in contact with the main body 10 and has a superconducting electromagnet. The magnetic field generated from the magnetic field generator 9 is set to be strong at the lower side of the main body 10 and weaker as it goes upward. The strength of the magnetic field can be appropriately changed by a control device (not shown).

  The main body 10 includes a housing 11 and a motor 12. The housing 11 includes an inlet 13, an outlet 14, an outlet 15, a belt 16, water jets (fluid ejecting means) 17a and 17b, and a blower (collecting means) 18.

  The inlet 13 is provided in the housing 11 so as to be inclined with respect to the horizontal direction so that the inflow direction of the slurry is obliquely downward. The inflow port 13 is connected to the transfer line L and allows the slurry to flow into the housing 11.

  The outlet 14 is provided on the opposite side of the inlet 13 and discharges muddy water and the like. The outlet 14 is provided above the inlet 13. As a result, water is prevented from entering the upper side of the outlet 14 inside the housing 11.

  The discharge port 15 is provided below the belt 16 (the bottom of the casing 11), and discharges the soil particles and the like contained in the slurry so as not to accumulate in the casing 11. The discharge port 15 is provided with a valve V2 (see FIG. 2), and the discharge amount can be adjusted by the valve V2. Note that the discharge amount of the discharge port 15 is set to be less than the discharge amount of the outflow port 14.

  FIG. 5 is a diagram illustrating the configuration of the belt 16. As shown in the figure, the belt 16 is formed in a mesh shape by a magnetic wire Y having a diameter of about 2 mm that is magnetized by a magnetic field generated from the magnetic field generator 9. The mesh interval D is set to about 6 mm. With such a configuration, the belt 16 has a strength capable of allowing the soil particles to pass through when in contact with the slurry flowing in from the inlet 13 and withstanding the water pressure of the slurry. The mesh of the belt 16 is not limited to the shape shown in FIG. 5 but may be a shape having a hole (gap). Specifically, for example, a structure in which the magnetic wires Y intersect in a lattice shape may be used.

  Returning to FIG. 3 and FIG. 4, the belt 16 is stretched between a roller-like drive rotating body 19 provided at the upper portion of the housing 11 and a roller-like driven rotating body 20 provided at the lower portion of the housing 11. ing. The drive rotator 19 and the driven rotator 20 are arranged and fixed extending in the horizontal direction in the same straight line along the vertical direction. The drive rotator 19 is connected to the motor 12 and rotates according to the rotation of the motor 12. The direction of rotation is clockwise in FIG. The driven rotator 20 is rotatably provided. The belt 16 rotates with the rotation of the drive rotator 19.

  Further, the belt 16 is in contact with a roller-like rotator 21 that is disposed and fixed on a substantially central portion between the drive rotator 19 and the driven rotator 20 and on the surface F side facing the inflow port 13. The rotating body 21 is provided closer to the inlet 13 than the driving rotating body 19 and the driven rotating body 20. As a result, the belt 16 is inclined by about 15 °, for example, in the direction away from the inlet 13 with respect to the vertical direction in the portion of the belt 16 facing the inlet 13 from the driven rotor 20 to the rotor 21. . Moreover, in the part from the rotary body 21 to the drive rotary body 19, it inclines about 20 degrees, for example in the direction approaching the inflow port 13 with respect to a perpendicular direction. Accordingly, the belt 16 has a V-shaped surface F, G on the inflow port 13 side with the rotating body 21 as a substantial center. Due to the above arrangement of the belt 16, the surface F of the belt 16 facing the inlet 13 is at an angle substantially orthogonal to the inflow direction of the slurry flowing in from the inlet 13.

  The water jets 17 a and 17 b eject water (fluid) onto the belt 16. Water is supplied to the water jets 17a and 17b from the pump 22 (see FIG. 2), and the pressure of the water jetted from the water jets 17a and 17b is about 0.3 Mpa. The water jets 17a and 17b sandwich the belt 16 so that water is jetted onto the surface G facing the inflow port 13 and the back surface of the surface G at a portion directly above the position where the outflow port 14 of the belt 16 is disposed. Are arranged as follows. As shown in FIG. 4, the water jets 17 a and 17 b have a plurality of nozzles 23 and 24 that are arranged at regular intervals along the horizontal direction. Inject water toward The water jets 17a and 17b may inject water at different injection positions such that the water jet 17a is injected above the injection position P and the water jet 17b is injected above the injection position P.

  The blower 18 collects the iron powder by sucking it from the belt 16. The blower 18 is provided with a contact piece 18a that contacts the belt 16 along the upper portion of the suction port. The blower 18 sucks and collects iron powder while peeling from the belt 16 by the contact piece 18a. The suction force of the blower 18 is about 20 kpa.

  Next, the operation of the magnetic body recovery device 6 (magnetic body recovery method) will be described with reference to FIG. The magnetic body recovery device 6 is operated by a control device (not shown) such as power ON / OFF.

  First, when the magnetic body recovery device 6 is turned on, generation of a magnetic field by the magnetic field generator 9, rotation of the belt 16 by the motor 12, injection of water by the water jets 17a and 17b, and suction by the blower 18 are started. The At this time, the magnetic field generated by the magnetic field generator 9 is, for example, 2100 G (Gauss) in the vicinity where the slurry flowing in from the inlet 13 contacts the belt 16, and near the injection position P of the water jets 17 a and 17 b. In the vicinity of the suction port of the blower 18, for example, 750 G is strong enough to prevent the iron powder from being peeled off from the belt 16 by jetting. .

  Next, when the slurry flows into the housing 11 from the inlet 13, iron powder adheres to the magnetized belt 16. Then, when the belt 16 rotates and passes through the injection position P, soil particles other than iron powder are removed (washed) by the water jets 17a and 17b. The soil particles removed from the belt 16 by the water jets 17 a and 17 b and settled when flowing in from the inlet 13 are discharged from the outlet 14 or the outlet 15.

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

  As described above, according to the magnetic body recovery device 6 of the jet stirring system 1, the iron powder contained in the slurry is attached to the rotating belt 16 formed in a mesh shape that is magnetized by the magnetic field generated by the magnetic field generator 9. And after removing excess soil particles other than the iron powder adhering to the belt 16 by the water jets 17 a and 17 b, the blower 18 collects the iron powder from the belt 16. Thereby, since iron powder can be directly recovered from the slurry containing soil, muddy water, etc., iron powder can be efficiently recovered without taking the trouble of eliminating muddy water. In addition, since a series of processing until the iron powder is recovered from the discharged slurry can be performed by one apparatus, it is not necessary to arrange an apparatus such as a belt conveyor. Therefore, cost reduction and device downsizing can be achieved.

Moreover, the magnetic body collection | recovery apparatus 6 is provided with the discharge port 15 which discharge | emits soil particles (sand) other than iron powder etc. below the belt 16 (lower part of the housing 11). In the slurry, soil particles (soil) of 0.3 to 1.3 t / m ³ are mixed. Therefore, by providing the discharge port 15 below the belt 16, the discharge can be performed without accumulating soil particles in the apparatus. Thereby, even if it is a case where soil etc. contain soil etc., iron powder can be collected suitably. Moreover, since soil particles can generally be used as soil (valuable materials), and most of the iron powder is recovered, the reuse of the soil can be promoted.

  Further, the surface 16 of the belt 16 facing the inlet 13 into which the slurry flows is inclined at the upper end side in a direction away from the inlet 13 with respect to the vertical direction. With such a configuration, the contact area between the slurry and the belt 16 becomes larger than when the surface F facing the inflow port 13 is not inclined, so that the iron powder easily adheres to the belt 16. Further, impurities such as soil other than the iron powder easily pass through the mesh belt 16. As a result, only iron powder can be recovered with high efficiency.

  Further, the water jets 17 a and 17 b are arranged so as to sandwich the belt 16 so that fluid is ejected to the surface G facing the inlet 13 of the belt 16 and the back surface of the surface G. With such a configuration, impurities such as soil particles other than iron powder adhering to the belt 16 can be more effectively removed (washed). As a result, only iron powder can be recovered with high efficiency.

  As mentioned above, although this invention was demonstrated based on each embodiment, this invention is not limited only to these embodiment. For example, in the said embodiment, although the magnetic body was iron powder (Fe), as long as it is a magnetic body which has a reduction effect, things other than iron powder may be sufficient.

  Moreover, in the said embodiment, although water jet 17a, 17b is arrange | positioned so that the belt 16 may be pinched | interposed, it is good also as a structure which injects water from one direction. In addition to the water jets 17a and 17b, a water jet may be further arranged. Further, instead of the water jets 17a and 17b, air may be ejected as fluid ejecting means.

  Moreover, in the said embodiment, although the blower 18 was provided in the side by which the inflow port 13 of the housing | casing 11 is arrange | positioned, the blower 18 should just be in the back | latter stage of the water jets 17a and 17b and above the outflow port 14. For example, you may arrange | position at the outflow port 14 side.

  In the above embodiment, the water jets 17 a and 17 b are arranged above the outlet 14, but may be arranged below the outlet 14. In this case, the water jets 17a and 17b inject a fluid (water, air, etc.) onto the belt 16 in water and remove soil and the like by the pressure.

  Moreover, in the said embodiment, although the collection | recovery means was made into the blower 18, you may collect | recover iron powder from the belt 16 by another means. Specifically, for example, the iron powder may be collected from the belt 16 by a magnet having magnetism stronger than that of the belt 16 at the iron powder collection position.

It is a figure which shows the outline | summary of the jet stirring system containing a magnetic body collection | recovery apparatus. It is a figure which shows a part of jet-stirring system typically. It is side surface sectional drawing which shows the structure of a magnetic body collection | recovery apparatus roughly. It is the IV-IV sectional view taken on the line in FIG. It is a figure which shows the structure of a belt.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Injection stirring system, 3 ... Injection pipe, 4 ... Guide pipe, 5 ... Discharge slurry storage tank (tank), 6 ... Magnetic body collection | recovery apparatus, 9 ... Magnetic field generation part (magnetic field generation means), 13 ... Inlet, 15 ... discharge port, 16 ... belt, 17a, 17b ... water jet (fluid ejecting means), 18 ... blower (collecting means), F, G ... surface, L ... transport line.

Claims (6)

A magnetic material recovery device for recovering the magnetic material from a mixture containing the magnetic material,
Magnetic field generating means for generating a magnetic field;
A rotary belt provided in the influence of the magnetic field generated by the magnetic field generating means and formed in a mesh shape to which the magnetic material is adhered by being magnetized by the magnetic field;
Fluid ejecting means for ejecting fluid to the belt and removing the mixture other than the magnetic material attached to the belt;
Recovery means for recovering the magnetic body by suction from the belt from which the mixture other than the magnetic body has been removed by the fluid ejecting means;
A magnetic material recovery apparatus comprising:   The magnetic body recovery apparatus according to claim 1, further comprising a discharge port provided below the belt and configured to discharge the mixture other than the magnetic body.   The magnetic surface according to claim 1 or 2, wherein a surface of the belt facing the inlet into which the mixture flows is inclined in a direction away from the inlet with respect to a vertical direction on an upper end side thereof. Body recovery device.   The fluid ejecting means is disposed so as to sandwich the belt so that the fluid is ejected to a surface of the belt facing the inlet and a back surface of the surface. The magnetic body collection | recovery apparatus as described in any one of 1-3. The magnetic body recovery device according to claim 1,
An injection pipe for injecting a purification material containing a magnetic material into the contaminated soil ground;
A guide pipe for guiding the spray pipe into the contaminated soil ground and discharging the mixture containing the magnetic material discharged from the ground to the ground;
A transport line for transporting the mixture discharged from the guide pipe to the magnetic body recovery device;
A jet agitation system comprising:   The tank according to claim 5, further comprising a tank provided on the transfer line between the guide pipe and the magnetic body recovery device, and temporarily storing the mixture discharged from the guide pipe. Jet agitation system.

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