Separation recovery method and separation recovery apparatus

Abstract

One embodiment of the separation and recovery method includes a peeling step in which a treatment liquid of a crushed product of a composite material in which a plurality of materials are laminated and a monoethanolamine aqueous solution is heated and stirred to obtain a crushed mixture in which the materials contained in the crushed product are peeled between layers.

Description

TECHNICAL FIELD

[0001] The present application relates to a separation and recovery method and a separation and recovery apparatus. BACKGROUND

[0002] In the past, a technique of separating a specific material from a composite material in which a plurality of materials are laminated has been known.

[0003] For example, in Patent Literature 1, as a method of separating and recovering components from a composite plastic, a technique of using triethylene glycol as a separation solvent, and stirring various treated substances in the separation solvent heated to the vicinity of the boiling point, thereby recovering each component separately is disclosed. In addition, in Patent Literature 2, a technique of recycling resin materials of recyclable materials in mixed waste plastics, and thermally decomposing and oilizing resin of non-recyclable materials to recover as decomposition oil is disclosed. In addition, in Patent Literature 3, a technique of using a solvent in which a high-boiling alcohol is a main component to peel an organic coating film from a base material is disclosed.

[0004] Prior art documents

[0005] Patent documents

[0006] Patent Literature 1: Japanese Patent Application Publication No. 2013-6948

[0007] Patent Literature 2: Japanese Patent Application Publication No. 2008-95024

[0008] Patent Literature 3: Japanese Patent Application Laid-Open No. 2019-516004 SUMMARY

[0009] Problem to be solved by the invention

[0010] However, in the techniques disclosed in Patent Literatures 1 and 2, since heating to a high temperature is required, a large amount of energy is consumed, and there are concerns about safety. In addition, in the technique disclosed in Patent Literature 3, since the main solvent uses a flammable and high-carbon alcohol, there is a problem that the operating cost increases. Therefore, a technique capable of efficiently separating and recovering materials from a composite material is required.

[0011] The present application was made in view of the above circumstances, and an object thereof is to provide a separation and recovery method and a separation and recovery apparatus capable of efficiently separating materials from a composite material in which a plurality of materials are laminated.

[0012] Solution to the problem

[0013] One aspect of the separation and recovery method of the present application includes a peeling process in which a treatment liquid of a crushed product of a composite material in which a plurality of materials are layered and a monoethanolamine aqueous solution is heated and stirred to obtain a crushed mixture in which the materials contained in the crushed product are peeled from between the layers.

[0014] The separation and recovery method further includes a separation and recovery process in which the crushed mixture is separated and recovered as the plurality of materials by specific separation according to specific gravity difference.

[0015] The monoethanolamine aqueous solution contains monoethanolamine in an amount of 2% by weight or more and 100% by weight or less.

[0016] The monoethanolamine aqueous solution sometimes contains at least one of an alkaline earth metal and an alkali metal.

[0017] In the peeling process, microbubbles are generated in the treatment liquid and the treatment liquid is stirred to promote peeling between the layers of the materials.

[0018] In the peeling process, ultrasonic waves are propagated in the treatment liquid to generate the microbubbles.

[0019] The separation and recovery process includes a centrifugal separation process in which the treatment liquid containing the crushed mixture is centrifugally separated, a separation process in which the materials are separated by specific gravity separation using a specific gravity separation liquid having a specific gravity different from the plurality of materials contained in the crushed mixture in the treatment liquid centrifugally separated in the centrifugal separation process, and a drying process in which each of the materials separated in the separation process is dried.

[0020] In addition, one aspect of the separation and recovery apparatus of the present application includes a peeling section that heats and stirs a treatment liquid of a crushed product of a composite material in which a plurality of materials are layered and a monoethanolamine aqueous solution to obtain a crushed mixture in which the materials contained in the crushed product are peeled from between the layers, a centrifugal separation section that centrifugally separates the treatment liquid containing the crushed mixture, a separation section that separates the materials by specific gravity separation using a specific gravity separation liquid having a specific gravity different from the plurality of materials contained in the crushed mixture in the treatment liquid centrifugally separated by the centrifugal separation section, and a drying section that dries each of the materials separated by the separation section.

[0021] Effects of the invention

[0022] According to one aspect of the present application, materials can be efficiently separated from a composite material in which a plurality of materials are layered. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is a schematic view showing one example of the structure of the separation and recovery apparatus of the embodiment.

[0024] Fig. 2 is a flowchart showing one example of the process of the separation and recovery method of the embodiment.

[0025] Fig. 3 is a view for explaining the separation and recovery method of the embodiment.

[0026] Fig. 4 is a view for explaining the separation and recovery method of the embodiment.

[0027] Fig. 5 is a view for explaining the separation and recovery method of the embodiment. DETAILED DESCRIPTION

[0028] Hereinafter, one embodiment of the separation and recovery method and the separation and recovery apparatus will be described with reference to the drawings. Furthermore, in the present specification, portions that represent the same members or the same functions are denoted by the same reference numerals, and the description is sometimes omitted.

[0029] Fig. 1 is a schematic view showing one example of the structure of the separation and recovery apparatus 1 of the embodiment. The separation and recovery apparatus 1 is an apparatus that separates and recovers materials that constitute a composite material CM1 from the composite material CM1.

[0030] Here, the composite material CM1 that is the processing target of the separation and recovery apparatus 1 is a material in which a plurality of materials are layered by means of an adhesive, and the shape and the structure thereof are not particularly limited.

[0031] For example, the composite material CM1 can also be a material in which two or more thin film materials selected from various synthetic resin films, synthetic resin sheets, and metal foils and the like are layered by means of an adhesive. As one example of such a composite material CM1, a laminated film is cited.

[0032] In addition, for example, the composite material CM1 can also be a material in which a structural object formed of a material such as wood, metal, synthetic resin, and the like has the above-described thin film material attached thereto by means of an adhesive. In this case, the thin film material is also referred to as a coating film. Furthermore, the structural material, the number, the combination, and the like of the thin film material are not particularly limited.

[0033] Examples of synthetic resins used in film materials include polyethylene (PE), polypropylene (PP), polyamide, polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), cellophane, polystyrene (PS), ethylene-vinyl acetate copolymer (EVA), and polyvinyl chloride (PVC). Examples of metal foils used in film materials include aluminum foil (AL). In addition to synthetic resin films and metal foils, various other materials can be used for film materials. Examples of other materials include paper, thermosetting resin films, and coatings. Examples of adhesives used for bonding film materials include ether-based adhesives, epoxy-based adhesives, and ester-based adhesives.

[0034] Furthermore, in this embodiment, the composite material CM1 is composed of a first material M1 and a second material M2 of different types, with the second material M2 having a higher specific gravity than the first material M1. As an example, the first material M1 is PE (specific gravity 0.9–0.9 g / cm³). 3 The second material, M2, is PET (specific gravity 1.29~1.40g / cm³). 3 ).

[0035] like Fig. 1 As shown, the separation and recovery device 1 includes a crushing section 10, a stripping section 20, a centrifugal separation and washing section 30, and a drying section 40. The structure of each part of the separation and recovery device 1 will be described below.

[0036] [Structure of the fractured part]

[0037] The crushing section 10 crushes the composite material CM1 to be processed into small pieces. Specifically, the crushing section 10 includes a crusher 11, a blower 12, and a hopper 13.

[0038] The crusher 11, for example, is a roller mill, which crushes the composite material CM1 into multiple small pieces. Specifically, the crusher 11 crushes the composite material CM1 into small pieces of about 1 to 60 mm, more preferably into small pieces of about 5 to 10 mm. By finely crushing the composite material CM1 in this way, the surface area at the ends can be increased, thus promoting the interlayer separation of the material contained in the small pieces in the peeling section 20 (peeling process) described later. Hereinafter, the small pieces of composite material CM1 crushed by the crushing section 10 will also be referred to as "crushed material CM2".

[0039] Furthermore, when the crusher 11 crushes the composite material CM1, multiple cuts and holes can be made on the small pieces. In this way, by pre-setting cuts and holes on the small pieces, the contact area of ​​the peripheral ends of the small pieces that come into contact with the stripping liquid 21a described later can be increased.

[0040] The crushed material CM2 crushed by the crushing section 10 is transported to the hopper 13 by the blower 12. A valve V1 for adjusting the discharge of the crushed material CM2 by opening and closing is installed at the discharge portion of the hopper 13. By setting the valve V1 to an open state, the crushed material CM2 accommodated in the hopper 13 is fed to the peeling tank 21 described later.

[0041] Further, the crushing section 10 is not limited to the above-described structure. For example, the crushing section 10 can be configured to omit the blower 12 and the hopper 13. Alternatively, a conveyance device such as a conveyer belt can be used instead of the blower 12.

[0042] [Structure of peeling section]

[0043] The peeling section 20 is an example of a peeling section. The peeling section 20 is a device for heating and stirring the peeling liquid 21a into which the crushed material CM2 is fed, thereby obtaining a crushed mixture in which the materials contained in the crushed material CM2 are peeled from each other. Further, the peeling liquid 21a is an example of a treatment liquid.

[0044] Specifically, the peeling section 20 has a peeling tank 21, a heating section 22, and a stirring section 23.

[0045] The peeling tank 21 is a container for holding the peeling liquid 21a supplied from the peeling liquid tank 51 described later. The peeling liquid 21a contains a monoethanolamine (hereinafter referred to as MEA) aqueous solution. The content of the MEA in the peeling liquid 21a is, for example, 2% by weight or more and 100% by weight or less, and is preferably 5% by weight or more and 80% by weight or less. Further, the content of the MEA in the peeling liquid 21a is particularly preferably 10% by weight or more and 20% by weight or less. Further, the water used as a solvent does not necessarily have to be of a particular purity, and general-purpose industrial water, tap water, well water, or the like can be used directly.

[0046] Further, the peeling liquid 21a can contain either or both of an alkaline earth metal and an alkali metal as an additive. As the additive, for example, sodium hydroxide, calcium hydroxide, potassium hydroxide, or the like can be given. The additive can function as an active agent (surfactant) and can promote the peeling of the materials contained in the crushed material CM2 from each other. Further, the content of the additive in the peeling liquid 21a is preferably 5% by weight or less. Further, the pH (hydrogen ion concentration index) of the peeling liquid 21a is preferably in the range of 8 to 13.

[0047] The crushed material CM2 fed to the peeling liquid 21a is peeled from each other, that is, the adhesive is peeled, by the action of the MEA aqueous solution. Thus, the first material M1 and the second material M2 bonded by the adhesive are separated and become a state in which the first material M1 and the second material M2 are mixed. Hereinafter, the mixture of the first material M1 and the second material M2 is also referred to as a "crushed mixture".

[0048] In this way, by using a stripping fluid 21a containing relatively inexpensive MEA in the stripping section 20, operating costs can be reduced. In addition, by setting the MEA content in the stripping fluid 21a to 10% by weight or more and 20% by weight or less, and by using water as the main component, the hazards and toxicity of MEA can be reduced, thereby improving safety.

[0049] Furthermore, the stripping fluid 21a within the stripping tank 21 functions as a gravity separation fluid for separating the first material M1 and the second material M2 contained in the crushed mixture by gravity difference separation. Specifically, utilizing the gravity difference between the first material M1 and the second material M2 relative to the stripping fluid 21a, the first material M1 and the second material M2 remain at different positions (heights) in the stripping tank 21.

[0050] For example, the specific gravity of MEA is 1.02 g / cm³. 3 It dissolves in water in any proportion. Therefore, stripping solution 21a can be used as a solution with a specific gravity of 1.0 to 1.02 g / cm³. 3 It is used for gravity-separated sorting. The material stripped in the stripping liquid 21a remains at a position (height) corresponding to its specific gravity. For example, in the case where the first material M1 is PE and the second material M2 is PET, such as... Fig. 1 As shown, the first material M1 is retained above the stripping tank 21 (stripping liquid 21a), and the second material M2 is retained below the stripping tank 21 (stripping liquid 21a).

[0051] In the stripping tank 21, discharge outlets (not shown) are provided at different positions in the height direction, and each discharge outlet is connected to the centrifugal separation washing section 30 (the first centrifugal separation section 31 and the second centrifugal separation section 32 described later) by piping. Fig. 1 The diagram shows an example where outlets are provided above and below the stripping tank 21, with pipes T1 and T2 connected to each outlet. Here, the locations of the outlets correspond to the retention locations of the stripped (separated) first material M1 and second material M2. That is, stripping fluid 21a containing a greater amount of the first material M1 is discharged from pipe T1. Conversely, stripping fluid 21a containing a greater amount of the second material M2 is discharged from pipe T2.

[0052] Pipeline T1 and pipeline T2 are respectively equipped with valves V2 and V3 for adjusting the flow rate of the liquid flowing in the pipe by opening and closing. In addition, pipeline T1 and pipeline T2 are respectively equipped with pumps P1 and P2 for discharging the liquid flowing in the pipe to the first centrifugal separation unit 31 and the second centrifugal separation unit 32, which will be described later.

[0053] Further, the peeling tank 21 is connected to the peeling liquid tank 51 via a pipe T3. A valve V4 for adjusting the flow rate of the liquid flowing in the pipe T3 by opening and closing is provided in the pipe T3. Further, a pump P3 for sending the liquid flowing in the pipe to the peeling tank 21 is provided in the pipe T3.

[0054] The heating section 22 has a heat source formed of a boiler or an electric heater, and warms the peeling liquid 21a accumulated in the peeling tank 21. The temperature of the peeling liquid 21a is, for example, 25°C or higher and 95°C or lower, and more preferably 60°C or higher and 95°C or lower. As such, in the peeling section 20, since the peeling liquid 21a is warmed in the range of 25°C or higher and 95°C or lower which is relatively low, the improvement in safety can be achieved, and the amount of energy consumption can be suppressed.

[0055] The stirring section 23 stirs the peeling liquid 21a into which the crushed material CM2 is put. The method of stirring the peeling liquid 21a is not particularly limited, and various methods can be used. For example, the stirring section 23 can also be a stirring device that stirs using ultrasonic waves. In this case, the stirring section 23 transmits ultrasonic waves of 25 kHz or higher to the peeling liquid 21a via the peeling tank 21 or the like, thereby stirring the peeling liquid 21a using microbubbles and acoustic streaming generated in the peeling liquid 21a, and promoting peeling between the layers of the material contained in the crushed material CM2.

[0056] Further, for example, the stirring section 23 can also be a stirring device that discharges air into the peeling liquid 21a to generate microbubbles. In this case, the stirring section 23 discharges air from the lower portion of the peeling tank 21, thereby stirring the peeling liquid 21a using the microbubbles generated in the peeling liquid 21a, and promoting peeling between the layers of the material contained in the crushed material CM2. Further, for example, the stirring section 23 can also be a stirring device that stirs by physically rotating a stirrer such as a propeller. In this case, the stirring section 23 stirs by rotating the stirrer provided in the peeling liquid 21a. Furthermore, the stirring section 23 can also be a stirring section that combines the above-described stirring methods.

[0057] Here, the warming of the peeling liquid 21a by the heating section 22 and the stirring of the peeling liquid 21a by the stirring section 23 are for promoting peeling between the layers of the material contained in the crushed material CM2. Specifically, by heating the peeling liquid 21a, the peeling liquid 21a is activated and becomes easy to penetrate into the crushed material CM2, and thus peeling between the materials can be promoted. Further, by stirring the peeling liquid 21a, the adhesion between the materials relaxed by the peeling liquid 21a can be peeled efficiently.

[0058] In addition, in a case where microbubbles are generated in the stripping liquid 21a by ultrasonic waves or bubbling, the separation of the first material Ml from the second material M2 and the separation from the adhesive are promoted by the microbubbles adhering to the peripheral end portion of the crushed product CM2 using buoyancy and shaking. Therefore, by generating microbubbles in the stripping liquid 21a, the stripping (separation) of the first material Ml from the second material M2 can be efficiently performed. Furthermore, by configuring to generate microbubbles using ultrasonic waves, the temperature increase of the stripping liquid 21a can also be achieved, and thus the heat applied by the heating section 22 can be reduced, and the stripping liquid 21a can be heated with less energy.

[0059] Further, the stripping section 20 is not limited to the above-described configuration. For example, the stripping section 20 can also be configured to include the stripping liquid tank 51. In addition, the stripping section 20 can also be configured to include the above-described hopper 13 or the like.

[0060] [Structure of centrifugal separation and washing section]

[0061] The centrifugal separation and washing section 30 further performs separation and recovery (differential specific gravity separation) due to a difference in specific gravity while washing the first material Ml and the second material M2 separated by the stripping section 20.

[0062] Specifically, the centrifugal separation and washing section 30 has a first centrifugal separation section 31, a second centrifugal separation section 32, a first water washing tank 33, and a second water washing tank 34. Here, the first centrifugal separation section 31 and the second centrifugal separation section 32 are one example of a centrifugal separation section. The first water washing tank 33 and the second water washing tank 34 are one example of a separation section.

[0063] The first centrifugal separation section 31 is connected to the pipe Tl. In the first centrifugal separation section 31, the liquid flowing in the pipe Tl is supplied from the pump Pl. In addition, the second centrifugal separation section 32 is connected to the pipe T2. In the second centrifugal separation section 32, the liquid flowing in the pipe T2 is supplied from the pump P2.

[0064] For example, in a case where the valve V2 is in an open state and the valve V14 described later is in a closed state, the stripping liquid 21a discharged from the stripping tank 21 is supplied to the first centrifugal separation section 31. In addition, for example, in a case where the valve V2 is in a closed state and the valve V14 described later is in an open state, the washing water discharged from the first water washing tank 33 and the second water washing tank 34 is supplied to the first centrifugal separation section 31.

[0065] For example, in a case where the valve V3 is in an open state and the valve V15 described later is in a closed state, the stripping liquid 21a discharged from the stripping tank 21 is supplied to the second centrifugal separation section 32. In addition, for example, in a case where the valve V3 is in a closed state and the valve V15 described later is in an open state, the washing water discharged from the first water washing tank 33 and the second water washing tank 34 is supplied to the second centrifugal separation section 32.

[0066] The first centrifugal separation section 31 is a centrifugal separator provided with a motor 31a. The first centrifugal separation section 31 centrifugally separates the liquid supplied via the pipe T1 using the motor 31a as a driving source, thereby extracting the crushed mixture contained in the liquid. Also, the second centrifugal separation section 32, like the first centrifugal separation section 31, is a centrifugal separator provided with a motor 32a. The second centrifugal separation section 32 centrifugally separates the liquid supplied via the pipe T2 using the motor 32a as a driving source, thereby extracting the crushed mixture contained in the liquid.

[0067] Further, by the specific gravity differential separation by the peeling section 20 described above and the specific gravity differential separation in the centrifugal separation water washing section 30 described later, the liquid supplied to the first centrifugal separation section 31 contains a larger amount of the first material Ml. Also, by the same specific gravity differential separation, the liquid supplied to the second centrifugal separation section 32 contains a larger amount of the second material M2. Therefore, hereinafter, the crushed mixture processed in the first centrifugal separation section 31 (and the first water washing tank 33) will be referred to as the first material Ml, and the crushed mixture processed in the second centrifugal separation section 32 (and the second water washing tank 34) will be referred to as the second material M2.

[0068] Also, the first centrifugal separation section 31 and the second centrifugal separation section 32 are connected to the peeling liquid tank 51 via the pipe T4. A valve V5 is provided in the pipe T4. When the valve V5 is in an open state, the liquid (peeling liquid 21a) centrifugally separated by the first centrifugal separation section 31 and the second centrifugal separation section 32 is discharged to the peeling liquid tank 51 via the pipe T4.

[0069] The peeling liquid tank 51 is a container for storing the peeling liquid 21a. The peeling liquid 21a stored in the peeling liquid tank 51 can be supplied to the peeling tank 21 via the pipe T3.

[0070] A component concentration meter 51a for measuring the component concentration of the peeling liquid 21a is provided in the peeling liquid tank 51. Also, in the peeling liquid tank 51, a pipe T6 through which cleaning water flows via a valve V6 is connected. In the separation and recovery apparatus 1, for example, the valve V6 is controlled to be opened and closed based on the component concentration measured by the component concentration meter 51a, whereby the peeling liquid 21a stored in the peeling liquid tank 51 can be adjusted to a desired component concentration.

[0071] The first centrifugal separation section 31 and the second centrifugal separation section 32 are connected to the second cleaning water tank 62 via the pipe T5. A valve V7 is provided in the pipe T5. When the valve V7 is in an open state, the liquid (cleaning water) centrifugally separated by the first centrifugal separation section 31 and the second centrifugal separation section 32 is discharged to the second cleaning water tank 62 via the pipe T5.

[0072] The first centrifugal separation section 31 is connected to the first water washing tank 33 via a valve V8. Also, the second centrifugal separation section 32 is connected to the second water washing tank 34 via a valve V9. In the case where the valves V8 and V9 are in the open state, the crushed mixture separated by the first centrifugal separation section 31 and the second centrifugal separation section 32, respectively, is discharged to the corresponding first water washing tank 33 and second water washing tank 34.

[0073] The first water washing tank 33 and the second water washing tank 34 are connected to the first washing water tank 61 and the second washing water tank 62 via a pipe T6. A valve V10 is provided on the path connecting the first water washing tank 33 and the pipe T6. Also, a valve V11 is provided on the path connecting the second water washing tank 34 and the pipe T6.

[0074] Here, the first washing water tank 61 and the second washing water tank 62 are containers that store washing water used for washing the materials centrifugally separated. Specifically, the first washing water tank 61 stores washing water 61a supplied from an external water supply facility (not shown). The washing water 61a does not necessarily have a particular purity, and general industrial water, tap water, well water, or the like can be used directly.

[0075] The second washing water tank 62 stores the used washing water 61a used for washing as washing water 62a. Also, a component concentration meter 62b for measuring the component concentration of the washing water 62a is provided in the second washing water tank 62. Hereinafter, the washing water 61a and the washing water 62a are simply referred to as washing water without distinction.

[0076] A valve V12 is provided on the path connecting the first washing water tank 61 and the pipe T6. A valve V13 is provided on the path connecting the second washing water tank 62 and the pipe T6. Also, on the path of the pipe T6, a pump P4 for supplying the washing water stored in the first washing water tank 61 and the second washing water tank 62 to the first water washing tank 33 and the second water washing tank 34 is provided.

[0077] The pump P4 supplies the washing water 61a accumulated in the first washing water tank 61 to the first water washing tank 33 and the second water washing tank 34 in the case where the valve V12 is in the open state and the valve V13 is in the closed state. Also, the pump P4 supplies the washing water 62a accumulated in the second washing water tank 62 to the first water washing tank 33 and the second water washing tank 34 in the case where the valve V12 is in the closed state and the valve V13 is in the open state.

[0078] The first water washing tank 33 uses the washing water supplied via the pipe T6 to wash the first material M1 centrifugally separated by the first centrifugal separation section 31. Also, the second water washing tank 34 uses the washing water supplied via the pipe T6 to wash the second material M2 centrifugally separated by the second centrifugal separation section 32. The washing method is not particularly limited, and various washing methods can be adopted.

[0079] For example, as shown in FIG. 1, the first water washing tank 33 can be provided with a motor 33a as a driving source, and can be configured to wash (stir) by rotating a stirrer 33b provided in the washing water. Similarly, the second water washing tank 34 can be provided with a motor 34a as a driving source, and can be configured to wash (stir) by rotating a stirrer 34b provided in the washing water. Further, the first water washing tank 33 and the second water washing tank 34 can be configured to use ultrasonic waves or the like for washing. Fig. 1

[0080] Further, the washing water in the first water washing tank 33 and the second water washing tank 34 functions as a specific gravity separation liquid for separating the first material Ml and the second material M2 by specific gravity difference. Specifically, due to the specific gravity difference of the first material Ml and the second material M2 with respect to the washing water, the first material Ml and the second material M2 are retained at different positions (heights) in the first water washing tank 33 and the second water washing tank 34. For example, in the case where water is used as the washing water, as in the case of the MEA aqueous solution described above, the first material Ml is retained above the washing water, and the second material M2 is retained below the washing water.

[0081] The first water washing tank 33 and the second water washing tank 34 are each provided with a discharge port (not shown) for returning the washing water to the first centrifugal separation section 31 and the second centrifugal separation section 32. The discharge port is provided at a position (height) corresponding to the respective retention positions of the first material Ml and the second material M2. Specifically, in the first water washing tank 33 and the second water washing tank 34, a pipe T7 connected to the pipe Tl is connected to a discharge port above the retention position of the first material Ml. Further, in the first water washing tank 33 and the second water washing tank 34, a pipe T8 connected to the pipe T2 is connected to a discharge port below the retention position of the second material M2. Thus, in the pipe T7, washing water containing a large amount of the first material Ml is discharged. Further, in the pipe T8, washing water containing a large amount of the second material M2 is discharged.

[0082] The valve V2 is provided between the pipe T7 and the pump PI on the path of the pipe Tl. Further, the valve V14 is provided near the connection portion of the pipe T7 and the pipe Tl. Further, the valve V3 is provided between the pipe T8 and the pump P2 on the path of the pipe T2. Further, the valve V15 is provided near the connection portion of the pipe T7 and the pipe T2.

[0083] ​Here, in each group of valves V2 and V14, and valves V3 and V15, exclusive control is performed by having one of the valves in the open state, thereby enabling the liquid supplied to the first centrifugal separation unit 31 and the second centrifugal separation unit 32 to be either stripping liquid 21a or cleaning water.

[0084] Furthermore, as described later, in the first centrifugal separation section 31 and the second centrifugal separation section 32, by re-introducing the first material M1 and the second material M2 separated from the washing water into the first washing tank 33 and the second washing tank 34, centrifugal separation and washing (gravity difference separation) can be repeatedly performed. Thus, the first material M1 is collected in the first washing tank 33 and the second material M2 is collected in the second washing tank 34.

[0085] Additionally, the first washing tank 33 is provided with an outlet (not shown) for discharging the first material M1, which has undergone cleaning and gravity difference sorting, to the drying section 40. This outlet is connected to a pipe T9 connected to the drying section 40. A valve V16 and a pump P5 are provided along the path of the pipe T9. When the valve V16 is open, the pump P5 draws cleaning water containing the first material M1 from the first washing tank 33 and supplies it to the drying section 40 (first drying section 41).

[0086] Additionally, the second washing tank 34 is also provided with a discharge port (not shown) for discharging the second material M2, which has undergone cleaning and gravity difference sorting. This discharge port is connected to a piping T10 connected to the drying unit 40. A valve V17 and a pump P6 are provided along the path of the piping T10. When the valve V17 is open, the pump P6 draws cleaning water containing the second material M2 from the second washing tank 34 and supplies it to the drying unit 40 (second drying unit 42).

[0087] Furthermore, the centrifugal separation washing unit 30 is not limited to the structure described above. For example, the centrifugal separation washing unit 30 may also be configured to include a stripping liquid tank 51, a first washing water tank 61, and a second washing water tank 62.

[0088] In addition, Fig. 1 The structure is not limited to supplying materials that have been cleaned and sorted by gravity difference by the centrifugal separation washing section 30 from the first washing tank 33 and the second washing tank 34 to the drying section 40. For example, it may be configured to use a conveying device such as a conveyor belt to supply materials separated by the first centrifugal separation section 31 and the second centrifugal separation section 32 to the drying section 40.

[0089] In addition, Fig. 1In the structure of FIG. 6, although the structure in which the first centrifugal separation section 31 and the second centrifugal separation section 32 are connected to the second cleaning water tank 62 is provided, the structure in which the first water washing tank 33 and the second water washing tank 34 are connected to the second cleaning water tank 62 can also be provided. Thereby, the cleaning water used in the first water washing tank 33 and the second water washing tank 34 can be supplied to the second cleaning water tank 62.

[0090] [Structure of drying section]

[0091] The drying section 40 is one example of a drying section. The drying section 40 performs a process of drying the first material Ml and the second material M2 cleaned and separated by the centrifugal water washing section 30, respectively.

[0092] Specifically, the drying section 40 has a first drying section 41 and a second drying section 42.

[0093] The first drying section 41 dries the first material Ml supplied from the centrifugal water washing section 30 (the first centrifugal separation section 31) via the pipe T9. In addition, the second drying section 42 dries the second material M2 supplied from the centrifugal water washing section 30 (the second centrifugal separation section 32) via the pipe T10. Furthermore, the first material Ml and the second material M2 dried by the drying section 40 are recovered according to the material kind thereof.

[0094] In addition, the drying method of the first drying section 41 and the second drying section 42 is not particularly limited, and various drying methods can be used. For example, the first drying section 41 and the second drying section 42 can also be drying devices that perform drying by blowing warm air of about 90°C. In addition, the first drying section 41 and the second drying section 42 can also be drying devices that perform reduced-pressure drying by performing reduced-pressure exhaust on a sealed container in which the first material Ml or the second material M2 is accommodated.

[0095] Next, a separation and recovery method performed by the separation and recovery device 1 of the present embodiment will be described.

[0096] Fig. 2 is a flowchart indicating one example of a process of the separation and recovery method. As shown in Fig. 2 , the separation and recovery method includes a crushing process S1, a peeling process S2, a centrifugal separation process S3, a water washing process S4, and a drying process S5. Here, the peeling process S2 is one example of a peeling process. In addition, the centrifugal separation process S3, the water washing process S4, and the drying process S5 are one example of a separation and recovery process. Furthermore, the specific gravity difference separation process performed in the peeling process S2 can also be provided in a structure in which the process is included in the separation and recovery process.

[0097] The processes of the separation and recovery method described above are executed, for example, by a control device (not shown) of a computer structure. The control device has a computer structure including a processor, a main storage device, an auxiliary storage device, and the like, and executes the processes of the separation and recovery method described above in cooperation with a program or the like stored in the auxiliary storage device. In this case, the control device controls the operation of the separation and recovery device 1 based on the opening and closing control of the valves, the drive control of the pumps, and the like provided in each part of the separation and recovery device 1, and based on the sensing results of the sensor device (not shown) and the like.

[0098] The control device can be a control device of a single structure that uniformly controls the operation of the separation and recovery device 1, or can be a control device of a plurality of structures that controls the operation of each part of the crushing part 10, the stripping part 20, the centrifugal separation and water washing part 30, and the drying part 40, respectively. Furthermore, in the present embodiment, although the processes of the separation and recovery method executed by the control of the control device are described, the processes can also be executed by hand.

[0099] Hereinafter, the processes of the separation and recovery method will be described with reference to Fig. 1 and Figs. 3-5 . Fig. 2

[0100] [Crushing Process]

[0101] The crushing process S1 is mainly executed by the crushing part 10. In the crushing process S1, the composite material CM1 as the processing object is crushed into small pieces, i.e., the crushed material CM2, by the crusher 11. The crushed material CM2 is transported to the hopper 13 by means of a conveying member such as an air blower 12.

[0102] [Stripping Process]

[0103] The stripping process S2 is mainly executed by the stripping part 20. In the stripping process S2, first, the control device sets the valve V2 and the valve V3 to the closed state, sets the valve V4 to the open state, and drives the pump P3, and the stripping liquid 21a stored in the stripping liquid tank 51 is supplied to the stripping tank 21. When the stripping liquid 21a supplied to the stripping tank 21 reaches a predetermined amount, the control device stops the pump P3 and sets the valve V4 to the closed state. Next, the control device operates the warming part 22 and heats (warms) the stripping liquid 21a of the stripping tank 21 to a predetermined temperature.

[0104] Next, the control device pours the crushed material CM2 stored in the hopper 13 into the stripping liquid 21a of the stripping tank 21 by setting the valve V1 to the open state. Furthermore, in the present embodiment, the crushed material CM2 is poured after the stripping liquid 21a is supplied, but the present application is not limited thereto, and the stripping liquid 21a can be supplied after the crushed material CM2 is poured, for example.

[0105] ​When the feeding of the crushed matter CM2 into the stripping liquid 21a is completed, the control device agitates the stripping liquid 21a by driving the agitating section 23. By the agitation of the stripping liquid 21a, the frequency and area of the contact of the layer of the adhesive contained in the crushed matter CM2 with the stripping liquid 21a increase. In addition, by the warming of the stripping liquid 21a by the warming section 22, the stripping liquid 21a becomes easy to penetrate into the layer of the adhesive contained in the crushed matter CM2.

[0106] Thus, in the stripping section 20 (stripping process S2), the stripping of the adhesive from the crushed matter CM2 can be efficiently performed, and thus the separation of the first material Ml and the second material M2 can be efficiently performed. In addition, the adhesive can be removed from the crushed matter CM2, and thus the quality of the first material Ml and the second material M2 separated and recovered can be improved.

[0107] Next, the control device stops the warming section 22 and the agitating section 23, and allows the stripping liquid 21a to stand for a predetermined time. By the standing of the stripping liquid 21a, the first material Ml and the second material M2 stripped are separated to positions (heights) corresponding to their specific gravities. Specifically, the first material Ml having a smaller specific gravity is retained in the upper portion of the stripping tank 21, and the second material M2 having a larger specific gravity is retained in the lower portion of the stripping tank 21. Here, the standing time of the stripping liquid 21a is not particularly limited. For example, the control device can be configured to adjust the standing time in accordance with the size of the crushed matter CM2, the viscosity of the stripping liquid 21a, and the like.

[0108] Next, the control device sets the valve V2 to the open state (sets the valve V14 to the closed state), and drives the pump PI to supply the stripping liquid 21a in the upper portion of the stripping tank 21 to the first centrifugal separation section 31. In addition, the control device sets the valve V3 to the open state (sets the valve V15 to the closed state), and drives the pump P2 to supply the stripping liquid 21a in the lower portion of the stripping tank 21 to the second centrifugal separation section 32. Specifically, in the first centrifugal separation section 31, the stripping liquid 21a containing the first material Ml is mainly supplied, and in the second centrifugal separation section 32, the stripping liquid 21a containing the second material M2 is mainly supplied.

[0109] Further, in the stripping process S2, it is possible that the stripping liquid 21a is supplied to the first centrifugal separation section 31 and the second centrifugal separation section 32 in a state in which the other material is mixed in the main one material group for some reason. Thus, in the separation and recovery method of the present embodiment, the separation processing of the first material Ml and the second material M2 is further performed in the centrifugal separation process and the water washing process described later.

[0110] [Centrifugal Separation Process, Water Washing Process]

[0111] The centrifugal separation process S3 and the water washing process S4 are mainly executed by the centrifugal separation water washing section 30. Hereinafter, the centrifugal separation process S3 and the water washing process S4 will be described with reference to Figs. 3-5 to the centrifugal separation process S3 and the water washing process S4.

[0112] Figs. 3-5 is a view for explaining the centrifugal separation process S3 and the water washing process S4. The arrows indicated by solid lines show the movement of the 1st material Ml, the 2nd material M2, which are the objects of recovery. In addition, the arrows indicated by dotted lines show the movement of the stripping liquid 21a. In addition, the arrows indicated by single-dot chain lines show the movement of the washing water. In addition, in Figs. 3-5 , the pipes in the open state are indicated by solid lines, and the pipes in the unopened state are indicated by dotted lines.

[0113] First, in the centrifugal separation process S3, as shown in Fig. 3 , the valves V2 and V3 are in the open state, and the valves V14 and V15 are in the closed state. Also, the control device drives the pumps Pl and P2 to supply the stripping liquid 21a to the 1st centrifugal separation section 31 and the 2nd centrifugal separation section 32.

[0114] The supplied stripping liquid 21a is centrifugally separated into a liquid (the stripping liquid 21a) and a solid (the crushed mixture) by driving the motors 31a and 32a in the 1st centrifugal separation section 31 and the 2nd centrifugal separation section 32, respectively. At this time, the control device controls so as to discharge the stripping liquid 21a separated by the 1st centrifugal separation section 31 and the 2nd centrifugal separation section 32 to the stripping liquid tank 51 by setting the valve V5 to the open state. Thus, the stripping liquid 21a used in the 1st centrifugal separation section 31 and the 2nd centrifugal separation section 32 can be reused, and thus reduction of the running cost can be achieved.

[0115] When the centrifugal separation by the 1st centrifugal separation section 31 and the 2nd centrifugal separation section 32 is completed, the control device sets the valves V8 and V9 to the open state, and the separated crushed mixture is discharged to the 1st water washing tank 33 and the 2nd water washing tank 34.

[0116] In the following water washing process S4, as shown in Fig. 4 or Fig. 5 , the control device washes the crushed mixture in the 1st water washing tank 33 and the 2nd water washing tank 34 using the washing water supplied from the 1st washing water tank 61 or the 2nd washing water tank 62. Next, the control device allows the washing water in the 1st water washing tank 33 and the 2nd water washing tank 34 to stand, and, as with the stripping section 20 described above, the 1st material Ml and the 2nd material M2 are subjected to the specific gravity differential separation.

[0117] Next, the control device supplies cleaning water containing the first material M1 from the first washing tank 33 and the second washing tank 34 to the first centrifugal separation unit 31 by setting valve V2 to the closed state and valve V14 to the open state. Additionally, the control device supplies cleaning water containing the second material M2 from the first washing tank 33 and the second washing tank 34 to the second centrifugal separation unit 32 by setting valve V3 to the closed state and valve V15 to the open state. Furthermore, the control device repeatedly performs the separation of the first material M1 and the second material M2 by executing the centrifugal separation process S3 and the washing process S4 using cleaning water a predetermined number of times.

[0118] Furthermore, when the control device uses cleaning water for the centrifugal separation process S3, it controls the discharge of the centrifuged cleaning water into the second cleaning water tank 62 by setting valve V5 to the closed state and valve V7 to the open state. This allows the cleaning water used in the first centrifugal separation section 31 and the second centrifugal separation section 32 to be reused as cleaning water 62a, thus reducing the amount of water used for cleaning and lowering operating costs.

[0119] Furthermore, in the initial (or initial few) washing steps S4, it is preferable to use the washing water 62a accumulated in the second washing tank 62 for washing, and in the final washing step S4, to use the washing water 61a accumulated in the first washing tank 61 for washing. In this case, the control device may, for example, execute the centrifugation step S3 and the washing step S4 according to the following steps.

[0120] First, such as Fig. 4 As shown, by setting valves V10, V11, and V13 to the open state and valve V12 to the closed state, the cleaning water 62a accumulated in the second cleaning water tank 62 is supplied by pump P4 to the first washing tank 33 and the second washing tank 34. Furthermore, at this time, valves V14 and V15 are in the closed state.

[0121] When the supply of cleaning water 62a reaches the predetermined amount, the control device closes valves V10, V11, and V13 and stops pump P4. Then, the control device activates the first washing tank 33 and the second washing tank 34 to begin cleaning using the supplied cleaning water 62a.

[0122] When cleaning is performed for a predetermined time, the control device stops the operation of the first water washing tank 33 and the second water washing tank 34, allowing the cleaning water 62a to stand still for the predetermined time.

[0123] Next, the control device opens valve V14 and drives pump P1 to supply cleaning water 62a from above the first washing tank 33 and the second washing tank 34 to the first centrifugal separator 31. Additionally, the control device opens valve V15 and drives pump P2 to supply cleaning water 62a from below the first washing tank 33 and the second washing tank 34 to the second centrifugal separator 32.

[0124] Next, in the first centrifugal separation unit 31 and the second centrifugal separation unit 32, the centrifugal separation process S3, which separates the liquid (washing water 62a) from the solid (first material M1, second material M2), is performed in the same manner as described above. Here, the centrifuged washing water 62a can be disposed of or discharged into the second washing water tank 62. In addition, the centrifuged solid is fed back into the first washing tank 33 and the second washing tank 34. Furthermore, the washing process S4 using washing water 62a can be performed once or multiple times.

[0125] Furthermore, when the water washing process S4 using cleaning water 62a is performed a predetermined number of times, as a final cleaning step, the water washing process S4 using cleaning water 61a from the first cleaning water tank 61 is performed once or multiple times.

[0126] Specifically, such as Fig. 5 As shown, by setting valves V10, V11, and V12 to the open state and valve V13 to the closed state, the cleaning water 61a accumulated in the first cleaning water tank 61 is supplied by pump P4 to the first washing tank 33 and the second washing tank 34. At this time, valves V14 and V15 are in the closed state.

[0127] When the supply of cleaning water 61a reaches the predetermined amount, the control device closes valves V10, V11, and V12 and stops pump P4. Then, the control device activates the first washing tank 33 and the second washing tank 34 to begin cleaning using the supplied cleaning water 61a.

[0128] Here, the control device can also be configured such that, after cleaning for a predetermined time, the first material M1 and the second material M2, which have undergone specific gravity separation selection, are returned to the first centrifugal separation section 31 and the second centrifugal separation section 32 in the same order as described above. In this case, during the centrifugal separation process S3, the control device sets valve V5 to the closed state and valve V7 to the open state, causing the centrifuged cleaning water 61a to be discharged as cleaning water 62a into the second cleaning water tank.

[0129] Further, the control device can also cause the first material Ml and the second material M2, which have been subjected to the cleaning and the specific gravity separation selection, to be transferred to the drying process S5. In this case, the control device supplies the first material Ml accumulated in the first water washing tank 33 to the first drying section 41 together with the cleaning water 61a by setting the valve V16 to an open state and driving the pump P5. Further, likewise, the control device supplies the second material M2 accumulated in the second water washing tank 34 to the second drying section 42 together with the cleaning water 61a by setting the valve V17 to an open state and driving the pump P6.

[0130] As such, in the separation and recovery method of the present embodiment, the cleaning and the specific gravity separation of the first material Ml and the second material M2 are repeatedly performed by repeatedly performing the centrifugal separation process S3 and the water washing process S4. Thus, in the separation and recovery method of the present embodiment, the degree of cleaning of the first material Ml and the second material M2 can be improved, and the separation precision of the first material Ml and the second material M2 can be improved. Therefore, in the separation and recovery method of the present embodiment, the separation and recovery of the first material Ml and the second material M2 can be efficiently performed, and the quality of the first material Ml and the second material M2, which are separated and recovered, can be improved.

[0131] Further, in the separation and recovery method of the present embodiment, the stripping liquid 21a used for stripping of the materials can be reused, and the cleaning water 61a used in the cleaning of the materials can be reused as the cleaning water 62a. Therefore, in the separation and recovery method of the present embodiment, the amount of water used for stripping of the materials and the amount of water used for cleaning of the materials can be reduced, and thus the separation and recovery of the materials can be efficiently performed.

[0132] [Drying Process]

[0133] The drying process S5 is mainly performed by the drying section 40. In the drying process S5, the first material Ml and the second material M2, which have been cleaned and subjected to the specific gravity separation in the water washing process S4, are dried, respectively. Hereinafter, the drying process S5 will be described with reference to FIG. 6. Fig. 5 The drying process S5 will be described.

[0134] The control device recovers the first material Ml by drying the first material Ml supplied from the centrifugal separation and water washing section 30 by driving the first drying section 41. Further, the control device recovers the second material M2 by drying the second material M2 supplied from the centrifugal separation and water washing section 30 by driving the second drying section 42.

[0135] As explained above, in the separation and recovery apparatus 1 of the present embodiment, the following peeling process is performed: the peeling liquid 21a in which the crushed product CM2 containing a composite material in which a plurality of materials are stacked by an adhesive and an MEA aqueous solution are heated and stirred, thereby obtaining a crushed mixture from which the adhesive is peeled from the crushed product. Thus, in the separation and recovery apparatus 1, peeling of the adhesive from the crushed product CM2 can be easily performed, and thus separation of the plurality of materials can be efficiently performed.

[0136] Further, in the separation and recovery apparatus 1 of the present embodiment, in the peeling process or the water washing process, the crushed mixture is separated into the plurality of materials by specific gravity difference sorting. Thus, in the separation and recovery apparatus 1, the plurality of materials dispersed due to peeling of the adhesive can be separated based on the specific gravity thereof.

[0137] Further, in the separation and recovery apparatus 1 of the present embodiment, the MEA aqueous solution (peeling liquid 21a) in which the content of MEA is 2% by weight or more and 100% by weight or less is used to peel the adhesive from the crushed product CM2. Thus, in the separation and recovery apparatus 1, the risk / toxicity of MEA can be reduced, and thus improvement of safety can be achieved.

[0138] Further, in the separation and recovery apparatus 1 of the present embodiment, the MEA aqueous solution (peeling liquid 21a) containing at least one of an alkaline earth metal and an alkali metal is used to peel the adhesive from the crushed product CM2. Thus, in the separation and recovery apparatus 1, peeling of the adhesive from the crushed product CM2 can be promoted, and thus separation of the plurality of materials can be efficiently performed.

[0139] Further, in the separation and recovery apparatus 1 of the present embodiment, microbubbles are generated in the peeling liquid 21a and the peeling liquid 21a is stirred. Thus, in the separation and recovery apparatus 1, peeling of the adhesive from the crushed product CM2 can be promoted, and thus separation of the plurality of materials can be efficiently performed.

[0140] (Modified Example 1)

[0141] In the above-described embodiment, since the materials to be recovered are two (the first material M1 and the second material M2), the structure in which two sets of the centrifugal separation section and the water washing section are prepared is provided, but the present application is not limited thereto, and the structure of the separation and recovery apparatus 1 can be changed according to the number of materials to be recovered.

[0142] For example, in a case where the materials to be recovered are three kinds (however, different in specific gravity), three sets of the centrifugal separation sections and the water washing sections are prepared. In addition, in the peeling tank 21, discharge ports are provided at positions (heights) corresponding to the specific gravities of the respective materials, and pipes connecting the discharge ports to the centrifugal separation sections of the respective sets are provided. In addition, in the water washing sections of the respective sets, discharge ports are also provided at positions (heights) corresponding to the specific gravities of the respective materials, and pipes connecting the discharge ports to the centrifugal separation sections of the sets responsible for the specific gravity difference sorting are provided. Thus, it is possible to separate and recover the respective materials peeled (separated) in the peeling tank 21 by using the drying section 40 connected to the centrifugal separation sections of the respective sets.

[0143] (Modified Example 2)

[0144] In the above-described embodiment, the separation and recovery device 1 (separation and recovery method) including the crushing section 10 (crushing process S1) is described, but for example, in a case where a crushed composite material CM1 is prepared in advance, a structure in which the crushing section 10 (crushing process S1) is removed can be provided. In this case, in the peeling section 20 (peeling process S2), by processing using the composite material CM1 (crushed material CM2) crushed in advance, the same effects as those of the above-described embodiment can be obtained.

[0145] (Modified Example 3)

[0146] In the above-described embodiment, the peeling liquid 21a is provided as a structure containing at least one of alkaline earth metal and alkali metal as an additive, but a structure containing neither of the alkaline earth metal and the alkali metal can be provided. In this case, although the function of the additive (activator) is lacking compared to the above-described embodiment, the advantages listed below can be obtained.

[0147] First, in a case where the peeling liquid 21a contains alkaline earth metal and alkali metal, it is possible to cause damage to the synthetic resin (PET or the like) and metal (AL or the like) as the materials to be recovered. Specifically, the alkaline earth metal and the alkali metal have a function of decomposing the synthetic resin, and thus it is possible to cause the synthetic resin to deteriorate at the peeling process S2. In addition, the AL is changed to aluminum hydroxide or aluminum oxide by the reaction of the alkaline earth metal and the alkali metal with the AL, and the risk of explosion or the like due to hydrogen generation increases. Thus, by providing a structure in which the alkaline earth metal and the alkali metal are not used, it is possible to achieve an improvement in the quality and safety of the materials to be recovered.

[0148] In addition, in a case where reduced-pressure drying is performed in the drying process S5, the alkaline earth metal and the alkali metal of the inorganic substance do not volatilize but remain, and thus the alkaline earth metal and the alkali metal can be mixed in the materials to be recovered. Thus, by providing a structure in which the alkaline earth metal and the alkali metal are not used, it is possible to reduce the residues other than the materials to be recovered, and thus it is possible to achieve an improvement in the quality of the materials to be recovered.

[0149] Further, if the stripping liquid 21a contains alkaline earth metals, alkali metals, the treatment at the time of final disposal of the stripping liquid 21a becomes complicated. On the other hand, in the case where the stripping liquid 21a does not contain alkaline earth metals, alkali metals, the MEA as a main component can be combusted, so it can be mixed in other fuels and subjected to combustion treatment. Therefore, by providing a structure that does not use alkaline earth metals, alkali metals, it is possible to achieve a reduction in the burden of disposal of the stripping liquid 21a.

[0150] Although the embodiments and modifications of the present application have been described above, these embodiments and modifications are presented as examples, and are not intended to limit the scope of the application. These novel embodiments and modifications can be implemented in other various ways, and various omissions, substitutions, and changes can be made within the scope of the gist of the application. These embodiments and modifications are included in the scope, gist of the application, and are included in the scope of the application and equivalents thereof recited in the claims.

[0151] Explanation of reference numerals

[0152] 1, separation and recovery device; 10, crushing section; 11, crusher; 12, blower; 13, hopper; 20, stripping section; 21, stripping tank; 22, warming section; 23, stirring section; 30, centrifugal separation and water washing section; 31, first centrifugal separation section; 32, second centrifugal separation section; 33, first water washing tank; 34, second water washing tank; 40, drying section; 41, first drying section; 42, second drying section; 51, stripping liquid tank; 61, first cleaning water tank; 62, second cleaning water tank.

Claims

1. A separation and recovery method, wherein, The separation and recovery method includes: In the stripping process, a crushed composite material containing multiple materials of different specific gravities is added to a stripping tank and heated and stirred to obtain a crushed mixture by stripping the interlayers of the materials contained in the crushed material. The first separation and recovery process involves separating and recovering the crushed mixture based on its specific gravity difference; and The second separation and recycling process involves separating and recycling the crushed mixture recovered in the first separation and recycling process into the various materials based on the difference in specific gravity. In the first separation and recovery step, after stirring, the crushed mixture is separated and recovered at the retention position in the stripping tank corresponding to the specific gravity of each material. The second separation and recovery process includes: A centrifugal separation process, in which the treatment liquid containing the broken mixture is separated by centrifugal force; and The separation process follows the centrifugal separation process, in which the crushed mixture is washed with a gravity separation liquid and the materials are separated by gravity separation according to their type. The gravity of the gravity separation liquid is different from that of the various materials contained in the crushed mixture in the treatment liquid separated by centrifugation in the centrifugal separation process.

2. The separation and recovery method according to claim 1, wherein, In the second separation and recovery process, the various materials are separated and recovered from the crushed mixture at each of the retention locations in parallel.

3. The separation and recovery method according to claim 1 or 2, wherein, The monoethanolamine aqueous solution contains monoethanolamine at a concentration of 2% by weight or more and 100% by weight or less.

4. The separation and recovery method according to claim 1 or 2, wherein, The monoethanolamine aqueous solution contains at least one of an alkaline earth metal and an alkali metal.

5. The separation and recovery method according to claim 1, wherein, In the peeling process, microbubbles are generated in the treatment solution and the treatment solution is stirred to promote the peeling of the material between layers.

6. The separation and recovery method according to claim 5, wherein, In the stripping process, ultrasonic waves are propagated in the treatment liquid to generate the microbubbles.

7. The separation and recovery method according to claim 2, wherein, The second separation and recovery process includes: A drying process in which the individual materials separated in the separation process are dried.

8. A separation and recovery device, wherein, The separation and recovery device has the following features: The stripping section introduces a composite material containing multiple materials of different specific gravities, along with a treatment solution of monoethanolamine aqueous solution, into a stripping tank and heats and stirs the mixture to obtain a broken mixture obtained by stripping the interlayers of the materials contained in the broken material. A centrifugal separation unit that uses centrifugal force to separate the treatment liquid containing the broken mixture; The separation section uses a gravity separation liquid to wash the crushed mixture and separates the materials by type through gravity separation. The specific gravity of the gravity separation liquid is different from that of the various materials contained in the crushed mixture in the treatment liquid centrifuged and separated by the centrifugal separation section. as well as The drying section dries the individual materials separated by the separation section. The stripping section separates and recovers the crushed mixture at the retention position in the stripping tank corresponding to the specific gravity of each material after stirring. The centrifugal separation unit centrifuges the processing liquid containing the crushed mixture recovered from the stripping section.

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