JP2010046635A - Agitation separation device and agitation separation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an agitation separation device and an agitation separation method that can easily separate by agitation a plurality of solid materials that have each a different buoyancy while coming up to the liquid surface. <P>SOLUTION: The agitation separation device that separates a plurality of solid materials that have each a different buoyancy while coming up to the liquid surface is characterized by being equipped with a holding tank for holding a liquid mixture of a plurality of solid materials and a liquid, a rotating shaft installed vertically and driven by a motor, a rotary vane attached to the lower end of the rotating shaft, a cylindrical casing arranged around the rotary vane so as to encircle the rotary vane and an outlet arranged at the surface of the liquid mixture in the holding tank for discharging a solid material with a large buoyancy. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a stirring separation device and a stirring separation method. In particular, the present invention relates to a stirring separation device and a stirring separation method for separating a plurality of solid objects having different buoyancy in accordance with buoyancy.

  2. Description of the Related Art Conventionally, it has been practiced to collect recyclable plastic from a mixture of household waste including plastic waste and use it as a raw material for recycled molded products. When recovering plastic waste materials used as raw materials for this recycled molded product, the waste mixture is finely cut for the purpose of removing vinyl chloride, etc. that generates harmful gases, and then separated and recovered using the difference in specific gravity. It is generally done.

  For example, after immersing a plurality of types of plastic waste in a wetting agent solution in a wetting treatment tank and then introducing it into a stirring and separation tank and stirring in the liquid, the bubbles attached to the plastic waste are separated. In this way, an upward flow in a substantially vertical direction is generated to separate into high specific gravity plastic and low specific gravity plastic, and then the separated low specific gravity plastic is introduced into the floating separation tank to perform the floating separation treatment, resulting in a difference in water repellency. A method and apparatus for separating resinous waste that separates low specific gravity plastics by using a method is disclosed (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-58382 (Claims, FIG. 7, etc.)

Here, in the case of forming a recycled molded product using plastic waste material, first, the plastic waste material is heated and melted to form a slurry, which is then poured into a mold and solidified. At this time, if bubbles are mixed in the slurry, the density of the slurry is lowered, which may cause a decrease in strength and appearance of the molded product.
On the other hand, plastic waste contained in household waste often contains foamable plastic such as foamed styrene. This foamable plastic is made of a material having a property of foaming when heated. Therefore, if this foamable plastic is mixed in the material of the recycle molded product, the foamable plastic foams when the plastic waste is heated and melted, and bubbles are easily mixed in the slurry. For this reason, it is desired to remove foamable plastic as much as possible when recovering recyclable plastic waste.

  However, the separation method of Patent Document 1 is intended to separate oily suitable materials (PE, PP, PS) and oily unsuitable materials (ABS, PET, PVC) from plastic waste materials. The removal is not considered. If foamable plastic is mixed, it will float on the liquid surface in both steps of the agitation fractionation process and the floatation fractionation process, so that it will eventually be recovered. Therefore, there is a possibility that the foamable plastic may be used as a raw material of a recycled molded product without being separated and removed from the foamable plastic while being mixed in the plastic waste material.

  Accordingly, the inventors of the present invention have made diligent efforts and floated on the liquid together. On the other hand, when separating a plurality of solid objects having different buoyancy in accordance with the buoyancy, the liquid mixed with the plurality of solid objects has a high buoyancy The present invention has been completed by finding that such a problem can be solved by taking out a solid object having a large buoyancy while stirring the liquid so that only the solid object floats on the liquid surface. Is. That is, an object of the present invention is to provide a stirring / separating apparatus and a stirring / separating method capable of easily stirring and separating a plurality of solid materials having different buoyancy while both float on a liquid.

  According to the present invention, a stirring and separating device that separates a plurality of solid objects having different buoyancy while both float on the liquid, a storage tank that stores a mixed liquid of the plurality of solid objects and the liquid, A rotating shaft that extends in the vertical direction and is rotationally driven by a motor, a stirring blade attached to the lower end of the rotating shaft, and a cylindrical casing that is disposed so as to surround the stirring blade in the circumferential direction of rotation of the stirring blade; An agitation / separation device is provided, wherein the agitation / separation device is provided with an outlet disposed at the liquid level of the mixed liquid in the storage tank and taking out a solid matter having a large buoyancy, and can solve the above-described problem. .

  In configuring the stirring and separating apparatus of the present invention, it is preferable to provide an outlet height adjusting mechanism that makes the height of the outlet variable.

  In configuring the agitation / separation apparatus of the present invention, the motor is mounted on the mounting plate, the rotating shaft extends to the lower side of the motor, and the mounting plate has a variable height. It is preferable to provide a plate height adjusting mechanism.

  In configuring the stirring and separating apparatus of the present invention, it is preferable that the axial width of the cylindrical casing and the width of the stirring blade in the rotational axis direction are equal.

  Another aspect of the present invention is a stirring separation method for separating a plurality of solid substances having different buoyancy while both float on the liquid, and the mixture is put into the liquid and the buoyancy of the mixture is reduced. A stirring and separating method is characterized in that a solid material having a large buoyancy is taken out while stirring the liquid so that only a large solid material floats on the surface of the liquid.

  Moreover, when implementing the stirring separation method of this invention, it is preferable that a some solid thing is a plastic waste material containing a foamable plastic.

According to the stirring / separating device of the present invention, the cylindrical casing disposed so as to surround the stirring blade is provided in the rotation peripheral direction of the stirring blade, so that the mixed liquid can flow from the upper side to the bottom surface inside the cylindrical casing. On the other hand, a circulating flow is generated in which the liquid mixture flows from the bottom side toward the upper side along the side wall of the storage tank outside the cylindrical casing. That is, not only a swirling flow according to the rotation of the stirring blades but also a vertical circulating flow is generated. Therefore, while the stirring effect of the mixed liquid is remarkably improved, the size of the gas phase portion formed in the rotating central portion of the swirling flow on the liquid surface side is reduced.
Therefore, when the liquid mixture was stirred so that only the solid matter having a large buoyancy floated on the liquid surface, the solid matter that floated was collected at the center of the liquid surface, and the outlet was disposed on the liquid surface. The discharged solid matter can be easily recovered by the discharging means.

  Further, in the stirring / separating device of the present invention, since the outlet height adjusting mechanism is provided, the height of the outlet can be changed corresponding to the liquid level of the mixed liquid in the storage tank. The solid matter that has floated to the center of the surface is easily recovered. Further, if the height of the take-out port is adjusted accurately, it is possible to take out only the solid matter that has floated so as not to involve liquid as much as possible.

  Further, in the stirring / separating device of the present invention, the height position of the stirring blade and the cylindrical casing can be adjusted by providing a mechanism for adjusting the height of the mounting plate on which the motor to which the rotating shaft is connected is mounted. It is controlled and the flow state of the liquid mixture can be adjusted.

  Further, in the stirring / separating device of the present invention, by matching the axial width of the cylindrical casing with the axial width of the stirring blade, the upper opening of the cylindrical casing can be opened even when the remaining amount of the mixed liquid is small. It can be immersed in the liquid mixture and a circulating flow can be generated. Therefore, even when the remaining amount of the mixed liquid is small, the stirring / separating device can be used.

  Further, according to the stirring and separating method of the present invention, by removing the solid matter that has floated while stirring the liquid mixture so that only the solid matter having a large buoyancy floats on the liquid surface, bubbles are formed on the surface of the solid matter. The solid matter with relatively small buoyancy does not rise due to the adhering, and the solid matter with relatively large buoyancy can be easily and reliably recovered.

  Further, in the stirring separation method of the present invention, the solid material is a plastic waste material containing a foamable plastic, so that the foamable plastic mixed in the plastic waste material can be easily separated and recovered, and the plastic is suitable for recycle molding. Only waste materials can be separated.

Hereinafter, embodiments according to the stirring and separating apparatus and the stirring and separating method of the present invention will be specifically described with reference to the drawings as appropriate. However, the following embodiment shows one aspect of the present invention, and does not limit the present invention, and can be arbitrarily changed within the scope of the present invention.
In addition, in each figure, what has attached | subjected the same code | symbol has shown the same member, and description is abbreviate | omitted suitably.

1. Stirrer / Separator First, the configuration of the stirrer / separator used in this embodiment will be described.
1 and 2 are diagrams for explaining the overall configuration of the stirring and separating apparatus 10 according to the present embodiment. FIG. 1 shows a side view of the stirring / separating device 10 of the present embodiment, and FIG. 2 shows a front view of the stirring / separating device 10 of FIG.

The agitation / separation apparatus 10 according to the present embodiment includes a support 11 constituted by a frame such as iron, a rotary shaft 15 that is rotationally driven by a motor 13, a stirring blade 17 that is fixed to the lower end of the rotary shaft 15, The height of the cylindrical casing 43 disposed so as to surround the stirring blade 17, the storage tank 23 in which the mixed liquid stirred by the stirring blade 17 is stored, and the mounting table 19 on which the motor 13 is mounted are variable. The mounting plate height adjusting mechanism 30 and the suction / discharge device 52 as a discharge means for taking out the solid matter floating on the liquid surface are mainly configured.
Among these, the storage tank 23 has a discharge pipe 22 on the side surface through which the liquid mixture is discharged during the stirring and separation operation, and a discharge port 24 for emptying the storage tank 23 at the time of maintenance or the like. ing. A discharge pipe 26 is connected to the discharge port 24, and the discharge pipe 26 is provided with a valve 25 that opens and closes the discharge port 24.

In addition, an introduction opening (not shown) for introducing the waste plastic mixed liquid into the storage tank 23 is provided in the peripheral portion of the mounting table 19 on which the motor 13 is placed. For example, an introduction pipe (not shown) connected to the outlet of the separation device used in the step of separating plastic waste having a high specific gravity such as vinyl chloride as a step before the step in which the stirring / separation device is used is connected. Has been.
An opening 19a is provided at the center of the mounting table 19, and a cylindrical motor fixing jig 27 is attached to the opening 19a. The motor 13 is mounted and fixed on the upper part of the motor fixing jig 27 so that the drive shaft (not shown) faces the inside of the motor fixing jig 27. A rotating shaft 15 inserted from below is connected to the drive shaft of the motor 13 through the inside of the motor fixing jig 27. The rotating shaft 15 extends downward, and a stirring blade 17 is fixed to the lower end portion.

Further, a rectifying casing 40 is attached to a portion of the motor fixing jig 27 that is located below the mounting table 19. FIG. 3 is a perspective view showing the rectifying casing 40 used in the stirring and separating apparatus 10 of the present embodiment.
The rectifying casing 40 includes a lower cylindrical casing 43 and a rotation shaft stopper 47 disposed in the middle thereof, and is welded and fixed to the three connecting members 45. Further, the upper end portion of the connecting member 45 is fixed to the mounting table 19 on which the motor 13 and the like are mounted with bolts or the like, so that the rectifying casing 40 is fixed.

  Among these, the cylindrical casing 43 is a cylindrical member having an inner hole 43a having a diameter larger than the diameter of the stirring blade 17, and by rotating the stirring blade 17, as shown in FIG. The downward flow S1 of the liquid from the inside 43 toward the bottom side can be strengthened. The downward flow S <b> 1 strengthened by the cylindrical casing 43 flows along the side wall from the bottom surface, and when it reaches the vicinity of the liquid level, it is led into the cylindrical casing 43 from the upper opening of the cylindrical casing 43. That is, with respect to the liquid mixture in the storage tank 23, not only the swirl flow T around the rotation shaft 15 due to the rotation of the stirring blade 17, but also the inside of the cylindrical casing 43 is lowered, while the outside of the cylindrical casing 43 Then, the rising circulating flow S can be generated.

As described above, in the stirring and separating apparatus 10 of the present embodiment, not only the swirling flow T but also the circulating flow S can be generated in the mixed liquid in the storage tank 23, so that the stirring effect of the mixed liquid is remarkably improved. Can do.
Further, the circulation flow S flows from the wall surface side around the storage tank 23 toward the central gas phase portion A in the vicinity of the liquid surface, and therefore the size of the gas phase portion A formed at the center of rotation. Has been made smaller. Further, the circulating flow S flows from the wall surface around the storage tank 23 toward the central gas phase portion A near the liquid level, and then descends toward the cylindrical casing 43 on the lower side. Therefore, the solid matter that floats on the liquid surface gathers in the gas phase portion A.

  In order to generate the circulating flow S by the cylindrical casing 43, the liquid level of the mixed liquid needs to be positioned above the upper end portion of the cylindrical casing 43. Therefore, when the amount of liquid mixture in the storage tank 23 is small, the upper end portion of the cylindrical casing 43 is preferably located at a position close to the bottom surface of the storage tank 23, and thus the axial width of the cylindrical casing 43. Is preferably as small as possible. However, when the width of the stirring blade 17 in the axial direction is larger than that of the cylindrical casing 43 and the stirring blade 17 protrudes from the cylindrical casing 43, the swirl flow T of the mixed liquid becomes strong, and the circulation described above. There is a possibility that the flow S becomes weak and cannot be sufficiently stirred.

  In the example of the stirring / separating device 10 of the present embodiment shown in FIGS. 1 and 2, the axial width of the cylindrical casing 43 and the axial width of the stirring blade 17 are equal. Therefore, even when the amount of the mixture stored in the storage tank 23 is small, the stirring effect of the mixture is enhanced.

Further, the rotation shaft anti-shake 47 in the rectifying casing 40 shown in FIG. 3 is fixed to the anti-blur portion 47b having the rotation shaft insertion hole 47a at the center and the three connecting members 45. The anti-blur support plate 47c is arranged on the upper portion of the cylindrical casing 43. The rotating shaft 15 is inserted into the insertion hole 47a of the anti-blur portion 47b, and is supported so as not to cause rotational shaking when the rotating shaft 15 is rotationally driven, so that stable rotational driving is performed.
Further, since the upper space of the cylindrical casing 43 is divided into three regions by the three anti-blur support plates 47c that fix the anti-blur portion 47b to the connecting member 45, the above-described circulation flow S is cylindrical. The flow is rectified when flowing into the casing 43, and a downward flow is more likely to occur in the cylindrical casing 43.

  Returning to FIG. 1 and FIG. 2, the stirrer / separator 10 of this embodiment is provided with a mounting plate height adjusting mechanism 30 that can change the height of the mounting table 19 on which the motor 13 is mounted. The mounting plate height adjusting mechanism 30 provided in the stirring / separating device 10 of the present embodiment is configured using a hoist crane 31 and a chain wire 33. A hook 35 is provided at the tip of the chain wire 33, and the hook 35 is connected to the mounting table 19. The hoist crane 31 raises or lowers the mounting table 19 by hoisting or lowering the chain wire 33. Can be lowered. The mounting table support jig 37 that supports the mounting table 19 is guided by the support 11 assembled in the vertical direction so as to be movable in the vertical direction.

However, the configuration of the mounting plate height adjusting mechanism 30 is not particularly limited, and may be configured using a rack and a pinion gear, or configured using a motor, an air cylinder, or the like.
Since the mounting plate height adjustment mechanism 30 of the mounting table 19 is provided, the height positions of the stirring blade 17 and the rectifying casing 40 can be adjusted. It becomes possible to control according to the capacity. Moreover, since the mounting table 19 can be raised when cleaning the inside of the storage tank 23, the inside of the storage tank 23 becomes easy to clean.

Further, the agitation / separation device 10 of the present embodiment is provided with a suction / discharge device 52, and an outlet 53 a at the tip of the suction pipe 53 connected to the suction / discharge device 52 is used for the liquid mixture in the storage tank 23. It is arranged near the liquid level. The suction / discharge device 52 sucks a solid material having a high buoyancy among a plurality of solid materials that floats when the mixed liquid is agitated and takes it out of the storage tank 23. The suction / discharge device 52 is connected to a cyclone device (not shown), and the sucked solid material and the liquid sucked at the same time are separated and collected.
Specifically, when the motor 13 of the stirring / separating device 10 is driven to stir the liquid mixture in the storage tank 23 to generate a swirl flow and a circulation flow, the rotation speed of the motor 13 is a certain rotation speed. Then, among the plurality of solid objects that float on the liquid, the solid object with the smaller buoyancy swirls and circulates with the liquid, while the solid object with the larger buoyancy floats on the liquid surface. . As described above, in the case of the agitation / separation device 10 of the present embodiment, not only a swirl flow but also a circulation flow is generated in the storage tank 23, so that the gas phase portion at the swivel center becomes small and the floating solid matter It gathers in the gas phase part of the turning center. The agitation / separation device 10 operates the suction / discharge device 52 after placing the outlet 53a of the suction pipe 53 close to the gas phase portion where the solid matter having a large buoyancy is gathered, so that the solid matter having a high buoyancy is removed. Can be sucked out.
As the suction / discharge device 52, for example, a suction pump is used.

Further, the shape of the outlet 53a of the suction pipe 53 does not obstruct at least the flow of the liquid in the storage tank 23, and can suck the solid matter that has floated by the suction force of the suction / discharge device 52. If it is, it will not be restrict | limited in particular. As an example, the outlet can be configured as shown in FIGS.
Among these, FIGS. 5A to 5B show the outlets 53aA and 53aB configured such that the opening surface of the tip portion of the suction tube 53 is merely a horizontal surface or an inclined surface, and the opening surface is an inclined surface. In the case of the take-out port 53aB configured as described above, the portion close to the liquid surface is disposed so as to be located downstream in the swirl direction of the liquid in the storage tank.
5C and 5D show the outlets 53aC and 53aD configured to open the upstream side in the swirling direction of the liquid in the storage tank at the distal end portion of the suction pipe 53, and the outlet 53aC is on the downstream side. The outlet 53aD has a flat tip at the tip of the suction pipe 53, and the downstream portion of the liquid in the tank in the swirling direction is formed in an arc shape with both ends protruding. Is.

  The suction pipe 53 is fixed to the motor fixing jig 27 by a ring-shaped fixing portion 55 that is tightened by a bolt (not shown). The fixing portion 55 can adjust the height of the leading outlet 53a by loosening the bolt and changing the fixing portion of the suction pipe 53. Therefore, the height of the outlet 53a can be adjusted according to the height position of the liquid level when the mixed liquid put into the storage tank 23 is being stirred, and the liquid or solid matter with small buoyancy can be removed. In a state where it is not contained as much as possible, the floating solid matter can be sucked and discharged.

  Of the components provided in the stirring and separating apparatus 10 of the present embodiment, the motor 13, the rotating shaft 15, the stirring blade 17, the rectifying casing 40, the suction / discharge device 52, the suction pipe 53, etc. are all coated with a fluororesin. Has been made. Therefore, it is excellent in releasability, the attached liquid can be easily washed away, and the cleaning operation can be performed efficiently.

2. Stirring and Separation Method Next, regarding the stirring and separation method performed using the stirring and separating apparatus 10 shown in FIG. 1, foaming is performed in a recyclable material plastic P1 (polypropylene (PP) or polyethylene (PE) having a specific gravity smaller than water). A method for taking out the foamable plastic P2 from the plastic waste P mixed with the expandable plastic P2 will be described.

  First, as shown in FIG. 6 (a), a waste plastic mixture obtained by mixing recyclable plastic P1 and foamable plastic P2 in water is put into the storage tank 23 through the introduction opening of the mounting table 19. In this state, both the recyclable material plastic P1 and the foamable plastic P2 float on the water surface. At this time, the waste plastic mixed liquid is not discharged from the discharge pipe 22 of the storage tank 23.

Next, the motor is driven to stir the waste plastic mixture, and as shown in FIG. 6 (b), the recyclable plastic material P1 having a relatively small buoyancy swirls and circulates in the storage tank 23 together with water. Thus, only the foamable plastic P2 having a large buoyancy is lifted.
In order to achieve such a state, the rotational speed of the motor may be adjusted while confirming the state in the storage tank 23, or the rotational speed of the motor that will be in such a state may be adjusted in advance. You may make it set.

Next, as shown in FIG. 7 (a), the height of the outlet 53a of the suction pipe 53 is adjusted, and the outlet is formed in the gas phase portion A formed in the waste plastic mixed liquid in which the foamable plastic P2 is collected. 53a is brought close to each other.
In addition, while making the quantity of the waste plastic mixed solution thrown into the storage tank 23 into a specified amount, the position of the liquid surface of the gas phase portion A in a state where the waste plastic mixed liquid is stirred is confirmed in advance, and the outlet 53a The height of may be set in advance.

Next, as shown in FIG. 7B, the suction / discharge device 52 is operated to suck the foamable plastic P <b> 2 floating on the water surface of the gas phase portion A and discharge it from the storage tank 23.
Once the swirling flow and the circulating flow are generated in the storage tank 23 and the recovery of the foamable plastic P2 that has floated is started, the waste plastics are mixed from the discharge pipe 22 of the storage tank 23 as shown in FIG. By continuously introducing the waste plastic mixed liquid according to the discharge amount of the waste plastic mixed liquid while discharging the liquid, the foamable plastic P2 having a large buoyancy is continuously collected. The waste plastic mixture that has flowed to the discharge pipe 22 is conveyed to the next step.

  According to the agitation and separation method of plastic waste material thus performed, only the foamable plastic can be easily removed from the plastic waste material in which both the recycle suitable plastic and the foamable plastic that float on the water are mixed. In addition, when molding recycled molded products using plastics that are suitable for recycling, there is a process of mixing and stirring the plastic crushed material with water for the purpose of removing bubbles and foreign substances adhering to the surface of the plastic crushed material. Although it may be performed, an excellent stirring effect can be obtained while removing the foamable plastic by performing such a process using the stirring and separating apparatus of the present embodiment, and bubbles attached to the surface of the crushed plastic material Foreign matter can be efficiently removed.

  In addition, about the introduction port and discharge port of a waste plastic liquid mixture, it can provide in an appropriate location. In addition, the stirring / separation work performed using the stirring / separation apparatus is not only continuously performed as in the above-described embodiment, but also the introduction of the waste plastic mixed liquid into the storage tank, the stirring separation, and the waste plastic mixed liquid You may make it perform each process of discharge | emission repeatedly.

  As described above, according to the stirring separation device and the stirring separation method of the present invention, the liquid mixture in the storage tank is provided by providing the cylindrical casing disposed so as to surround the stirring blade in the circumferential direction of the stirring blade. Thus, a swirl flow and a circulation flow can be generated, and a solid matter having a relatively large buoyancy can be levitated to the center of the liquid surface. Moreover, by providing the discharge means provided with the outlet at the center of the liquid level, the solid matter floating on the liquid level can be easily discharged. Therefore, even when a plurality of solid objects having different buoyancy that floats on the liquid are included, they can be easily separated according to the difference in buoyancy.

  In the above-described embodiment, the plastic waste material in which the plastic suitable for recycling and the foamable plastic are mixed has been described as an example. However, it goes without saying that a plurality of solid materials are not limited to this, and both are liquid. It can be applied as long as it includes a plurality of solid objects having different buoyancy.

It is a side view which shows the structural example of the stirring separation apparatus concerning embodiment of this invention. It is a front view which shows the structural example of the stirring separation apparatus concerning embodiment of this invention. It is a perspective view which shows the baffle casing with which the stirring separation apparatus was equipped. It is a figure for demonstrating the swirl flow and circulating flow which arise in a storage tank. It is a figure for demonstrating the structural example of the outlet of a suction tube. It is a figure for demonstrating the stirring separation method concerning embodiment of this invention. It is a figure for demonstrating the stirring separation method concerning embodiment of this invention. It is a figure for demonstrating the stirring separation method concerning embodiment of this invention.

Explanation of symbols

S: Circulating flow, S1: Downflow, T: Swirl flow, A: Gas phase portion, P1: Recyclable plastic, P2: Foamable plastic, 10: Stirrer, 11: Support, 13: Motor, 15: Rotation Axis, 17: stirring blade, 19: mounting table, 19a: opening, 22: discharge pipe, 23: storage tank, 24: discharge port, 25: valve, 26: discharge pipe, 27: jig for fixing motor, 40 : Straightening casing, 43: cylindrical casing, 43a: internal hole, 45: connecting member, 47: rotation shaft blur prevention, 47a: insertion hole, 47b: blur prevention part, 47c: support plate, 52: suction / discharge device

Claims (6)

In a stirring and separating device that separates a plurality of solid objects having different buoyancy while both float on the liquid,
A storage tank in which a mixed liquid of the plurality of solid objects and the liquid is stored;
A rotating shaft extending in the vertical direction and driven to rotate by a motor;
A stirring blade attached to the lower end of the rotating shaft;
A cylindrical casing disposed so as to surround the stirring blade in the circumferential direction of rotation of the stirring blade;
A discharge port is disposed at the liquid level of the mixed liquid in the storage tank, and the discharging means for taking out the solid matter having a large buoyancy;
A stirring and separating apparatus comprising:   The stirrer / separator according to claim 1, further comprising an outlet height adjusting mechanism that makes the height of the outlet variable.   The motor is mounted on a mounting plate, the rotating shaft extends below the motor, and includes a mounting plate height adjusting mechanism that makes the height of the mounting plate variable. The stirring and separating apparatus according to claim 1 or 2, characterized in that   4. The agitation / separation device according to claim 1, wherein a width of the cylindrical casing in the axial direction is equal to a width of the agitation blade in the rotation axis direction. In the stirring separation method for separating a plurality of solid objects having different buoyancy while both float on the liquid,
The mixture is poured into the liquid, and the solid matter having a high buoyancy is taken out while stirring the liquid so that only the solid matter having a high buoyancy in the mixture is floated on the liquid surface. The stirring separation method characterized by the above-mentioned.   6. The stirring and separating method according to claim 5, wherein the plurality of solid materials are plastic waste materials containing foamable plastic.

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