CN115666802A

CN115666802A - Separation and recovery method and separation and recovery device

Info

Publication number: CN115666802A
Application number: CN202180035641.9A
Authority: CN
Inventors: 时宗章; 青木秀尚; 小川秀道
Original assignee: Fujimori Kogyo Co Ltd
Current assignee: Fujimori Kogyo Co Ltd
Priority date: 2020-05-20
Filing date: 2021-05-19
Publication date: 2023-01-31
Also published as: JP2021181075A; WO2021235488A1; TW202206524A; JP7565708B2

Abstract

One embodiment of the separation and collection method of the embodiment includes a peeling step of heating and stirring a treatment liquid containing a crushed product of a composite material in which a plurality of materials are laminated and a monoethanolamine aqueous solution to obtain a crushed mixture in which layers of the materials contained in the crushed product are peeled.

Description

Separation and recovery method and separation and recovery device

Technical Field

The present invention relates to a separation and recovery method and a separation and recovery apparatus.

Background

Conventionally, a technique for separating a specific material from a composite material in which a plurality of materials are laminated is known.

For example, patent document 1 discloses a technique of using triethylene glycol as a separation solvent, charging various materials to be treated into the separation solvent heated to a temperature near the boiling point, and stirring the mixture to separate and recover the components from the composite plastic. Patent document 2 discloses a technique of recycling a recyclable resin material contained in mixed waste plastics and subjecting a non-recyclable resin material to thermal decomposition and oiling treatment to recover the resin as decomposed oil. Patent document 3 discloses a technique for peeling an organic coating from a substrate using a solvent containing a high-boiling alcohol as a main component.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2013-6948

Patent document 2: japanese laid-open patent publication No. 2008-95024

Patent document 3: japanese Kokai publication 2019-516004

Disclosure of Invention

Problems to be solved by the invention

However, the techniques disclosed in patent documents 1 and 2 require heating to a high temperature, and therefore consume a large amount of energy, and are also concerned about safety. In addition, in the technique disclosed in patent document 3, since a flammable higher alcohol having a large number of carbon atoms is used as the main solvent, there is a problem that the running cost increases. Therefore, a technique capable of efficiently separating and recovering a material from a composite material is required.

The present invention has been 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 a material from a composite material in which a plurality of materials are laminated.

Means for solving the problems

One embodiment of the separation and recovery method of the present invention includes a separation step of heating and stirring a treatment liquid containing a crushed product of a composite material in which a plurality of materials are laminated and a monoethanolamine aqueous solution to obtain a crushed mixture in which layers of the materials contained in the crushed product are separated.

The separation and recovery method further includes a separation and recovery step of separating and recovering the crushed mixture into the plurality of materials according to a difference in specific gravity.

The monoethanolamine aqueous solution contains monoethanolamine in an amount of 2 to 100 wt%.

The monoethanolamine aqueous solution may contain at least one of an alkaline earth metal and an alkali metal.

In the peeling step, microbubbles are generated in the treatment liquid and the treatment liquid is stirred, thereby promoting peeling between layers of the material.

In the peeling step, ultrasonic waves are propagated in the treatment liquid to generate the microbubbles.

The separation and recovery process includes: a centrifugation step of centrifuging the treatment liquid containing the crushed mixture; a separation step of separating the materials by type 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 step; and a drying step of drying each of the materials separated in the separation step.

In addition, one aspect of the separation and recovery apparatus of the present invention includes: a peeling section that heats and stirs a treatment liquid containing a composite material crushed product in which a plurality of materials are laminated and a monoethanolamine aqueous solution to obtain a crushed mixture in which layers of the materials contained in the crushed product are peeled; a centrifugal separation unit that centrifugally separates the treatment liquid containing the crushed mixture; a separation section that separates the materials by type 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 unit that dries each of the materials separated by the separation unit.

ADVANTAGEOUS EFFECTS OF INVENTION

According to one aspect of the present invention, a material can be efficiently separated from a composite material in which a plurality of materials are laminated.

Drawings

Fig. 1 is a schematic diagram showing an example of the structure of a separation and recovery apparatus according to an embodiment.

Fig. 2 is a flowchart showing an example of the procedure of the separation and recovery method according to the embodiment.

Fig. 3 is a diagram for explaining the separation and recovery method according to the embodiment.

Fig. 4 is a diagram for explaining the separation and recovery method according to the embodiment.

Fig. 5 is a diagram for explaining the separation and recovery method according to the embodiment.

Detailed Description

Hereinafter, an embodiment of a separation and collection method and a separation and collection apparatus will be described with reference to the drawings. In the present specification, the same reference numerals are given to the same members and the same functions, and the description thereof may be omitted.

Fig. 1 is a schematic diagram showing an example of the structure of a separation and recovery apparatus 1 according to the present embodiment. The separation and recovery apparatus 1 is an apparatus for separating and recovering the material constituting the composite material CM1 from the composite material CM 1.

Here, the composite material CM1 to be processed in the separation and collection apparatus 1 is not particularly limited in shape or structure as long as it is a material obtained by laminating a plurality of materials with an adhesive.

For example, the composite material CM1 may be a laminate of two or more kinds of film materials selected from various film materials such as a synthetic resin film, a synthetic resin sheet, and a metal foil, laminated with an adhesive. An example of such a composite material CM1 is a laminated film.

For example, the composite material CM1 may be a structure made of wood, metal, synthetic resin, or the like, to which the above-described film material is attached with an adhesive. In this case, the film material is also referred to as a coating film. The film material is not particularly limited in terms of its structural material, number, combination, and the like.

Typical examples of synthetic resins used for film materials include polyethylene resins (PE), polypropylene resins (PP), polyamide resins, polyethylene terephthalate resins (PET), polymethacrylic resins (PMMA), cellophane, polystyrene resins (PS), ethylene-vinyl acetate copolymers (EVA), and polyvinyl chloride resins (PVC). Examples of the metal foil used as the film material include aluminum foil (AL). In addition, various materials other than the synthetic resin film and the metal foil can be used as the film material. For example, paper, thermosetting resin films, paints, and the like are given as other kinds of materials. Examples of the adhesive used for bonding the film material include an ether adhesive, an epoxy adhesive, and an ester adhesive.

In the present embodiment, the composite material CM1 is composed of the 1 st material M1 and the 2 nd material M2 of different kinds, and the specific gravity of the 2 nd material M2 is higher than that of the 1 st material M1. As an example, the 1 st material M1 is PE (specific gravity 0.9-0.9 g/cm) ³ ) The 2 nd material M2 is PET (specific gravity 1.29-1.40 g/cm) ³ )。

As shown in fig. 1, the separation and collection apparatus 1 includes a crushing unit 10, a peeling unit 20, a centrifugal separation washing unit 30, and a drying unit 40. The following describes the structure of each part of the separation and collection apparatus 1.

[ Structure of the peeled portion ]

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

The crusher 11 is, for example, a roll mill, and crushes the composite material CM1 into a plurality of small pieces. Specifically, the crusher 11 crushes the composite material CM1 into small pieces of about 1 to 60mm, and more preferably into small pieces of about 5 to 10 mm. Since the area of the end portion can be increased by finely crushing the composite material CM1 in this manner, the interlayer peeling of the material contained in the small pieces can be promoted in the peeling section 20 (peeling step) described later. Hereinafter, the small pieces of the composite material CM1 crushed by the crushing section 10 are also referred to as "crushed material CM2".

When the crusher 11 crushes the composite material CM1, a plurality of notches and small holes may be provided in the small pieces. By providing the small piece with the notch or the small hole in advance in this manner, the contact area of the peripheral end portion of the small piece with the peeling liquid 21a described later can be increased.

The crushed material CM2 crushed by the crushing unit 10 is sent 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 attached to the discharge port portion of the hopper 13. By opening the valve V1, the crushed material CM2 stored in the hopper 13 is thrown into the separation tank 21 described later.

The crushing unit 10 is not limited to the above configuration. For example, the crushing unit 10 may be configured to remove the blower 12 and the hopper 13. Instead of the blower 12, a conveyor such as a conveyor belt may be used.

[ Structure of the peeled portion ]

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 put, thereby obtaining a crushed mixture obtained by interlaminar peeling of the material contained in the crushed material CM2. The stripping liquid 21a is an example of a treatment liquid.

Specifically, the peeling section 20 includes a peeling tank 21, a heating section 22, and a stirring section 23.

The stripping tank 21 is a container for holding a stripping liquid 21a supplied from a stripping liquid tank 51 described later. The stripping liquid 21a contains an aqueous solution of monoethanolamine (hereinafter, referred to as MEA). The content of MEA in the stripping liquid 21a is, for example, 2 wt% to 100 wt%, preferably 5 wt% to 80 wt%. Further, the content of MEA in the stripping liquid 21a is particularly preferably 10 wt% to 20 wt%. The water used for the solvent does not need to have a particular purity, and general industrial water, tap water, well water, and the like can be used as it is.

The stripping liquid 21a may contain either or both of an alkaline earth metal and an alkali metal as an additive. Examples of the additive include sodium hydroxide, calcium hydroxide, and potassium hydroxide. The additive can function as an active agent (surfactant) and can promote the delamination of layers of the material contained in the crushed material CM2. The content of the additive in the stripping liquid 21a is preferably 5 wt% or less. The pH (hydrogen ion concentration index) of the stripping liquid 21a is preferably in the range of 8 to 13.

The crushed material CM2 put into the release solution 21a is released between layers of the material contained in the crushed material CM2, that is, the adhesive is released, by the action of the MEA aqueous solution. Thereby, the 1 st material M1 and the 2 nd material M2 bonded by the adhesive are separated, and the 1 st material M1 and the 2 nd material M2 are mixed. Hereinafter, the mixture of the 1 st material M1 and the 2 nd material M2 is also referred to as a "crushed mixture".

In this manner, by using the stripping liquid 21a containing relatively inexpensive MEA in the stripping section 20, running cost can be reduced. Further, by setting the MEA content in the stripping liquid 21a to 10 wt% or more and 20 wt% or less, etc., and using water as a main component, the risk and toxicity of the MEA can be reduced, and thus the safety can be improved.

The stripping liquid 21a in the stripping tank 21 functions as a specific gravity separation liquid for separating the 1 st material M1 and the 2 nd material M2 contained in the crushed mixture by specific gravity difference separation. Specifically, the 1 st material M1 and the 2 nd material M2 stay at different positions (heights) of the peeling groove 21 due to the difference in specific gravity between the 1 st material M1 and the 2 nd material M2 with respect to 21a.

For example, the specific gravity of the MEA is 1.02g/cm ³ On the other hand, the water dissolves in an arbitrary ratio to water. Therefore, the specific gravity of the stripping liquid 21a can be 1.0 to 1.02g/cm ³ The specific gravity separation liquid of (4) is used. The material peeled in the peeling liquid 21a stays at a position (height) corresponding to the specific gravity thereof. For example, when the 1 st material M1 is PE and the 2 nd material M2 is PET, as shown in fig. 1, the 1 st material M1 is retained above the peeling tank 21 (peeling liquid 21 a), and the 2 nd material M2 is retained below the peeling tank 21 (peeling liquid 21 a).

In the peeling tank 21, drain ports (not shown) are provided at different positions in the height direction, and the centrifugal separation washing section 30 (the 1 st centrifugal separation section 31 and the 2 nd centrifugal separation section 32 described later) are connected to the drain ports by pipes. Fig. 1 shows an example in which water discharge ports are provided at two positions, i.e., above and below the peeling groove 21, and a pipe T1 and a pipe T2 are connected to the water discharge ports, respectively. Here, the position of the drain opening corresponds to the position where the 1 st material M1 and the 2 nd material M2 are retained after being peeled (separated). That is, the stripping liquid 21a containing a large amount of the 1 st material M1 is discharged from the pipe T1. Further, the stripping liquid 21a containing a large amount of the 2 nd material M2 is discharged from the pipe T2.

The pipe T1 and the pipe T2 are provided with valves V2 and V3 for adjusting the flow rate of the liquid flowing in the pipe by opening and closing, respectively. The pipe T1 and the pipe T2 are provided with pumps P1 and P2, respectively, for feeding the liquid flowing through the pipes to a 1 st centrifugal separation unit 31 and a 2 nd centrifugal separation unit 32, which will be described later.

The stripping tank 21 is connected to the stripping solution tank 51 via a pipe T3. The pipe T3 is provided with a valve V4 for adjusting the flow rate of the liquid flowing through the pipe T3 by opening and closing. The pipe T3 is provided with a pump P3 for feeding the liquid flowing through the pipe to the peeling tank 21.

The heating unit 22 has a heat source such as a boiler or electricity, and heats the stripping solution 21a accumulated in the stripping tank 21. The temperature of the stripping solution 21a is, for example, 25 ℃ to 95 ℃, and more preferably 60 ℃ to 95 ℃. In this manner, in the peeling section 20, the peeling liquid 21a is heated in a range of 25 ℃ to 95 ℃ at a relatively low temperature, so that it is possible to improve safety and suppress the amount of energy consumption.

The stirring section 23 stirs the stripping solution 21a into which the crushed material CM2 is introduced. The method of stirring the stripping liquid 21a is not particularly limited, and various methods can be used. For example, the stirring section 23 may be a stirring device that performs stirring by ultrasonic waves. In this case, the stirring section 23 propagates ultrasonic waves of 25kHz or more to the stripping liquid 21a through the stripping tank 21 and the like, thereby stirring the stripping liquid 21a by microbubbles and sonic flow generated in the stripping liquid 21a, and promoting the delamination of the layers of the material contained in the crushed material CM2.

For example, the stirring section 23 may be a stirring device that discharges air into the stripping liquid 21a to generate microbubbles. In this case, the stirring section 23 discharges air from below the peeling tank 21, thereby stirring the peeling liquid 21a by the microbubbles generated in the peeling liquid 21a, and promoting the interlayer peeling of the material contained in the crushed material CM2. For example, the stirring section 23 may be a stirring device that performs stirring by physically rotating a stirrer such as a propeller. In this case, the stirring section 23 rotates a stirrer provided in the stripping liquid 21a to stir the stripping liquid. The stirring section 23 may be a combination of the above-described stirring methods.

Here, the heating of the stripping liquid 21a by the heating unit 22 and the stirring of the stripping liquid 21a by the stirring unit 23 are for promoting the interlayer separation of the materials contained in the crushed material CM2. Specifically, the peeling liquid 21a is activated by heating the peeling liquid 21a, and the peeling liquid easily penetrates into the crushed material CM2, and thus the peeling between the materials can be promoted. Further, by stirring the peeling liquid 21a, the adhesion between the materials loosened by the peeling liquid 21a can be efficiently peeled.

In addition, when microbubbles are generated in the peeling liquid 21a by ultrasonic waves or bubbling, the microbubbles adhere to the peripheral edge portion of the crushed material CM2, and separation of the 1 st material M1 and the 2 nd material M2 and separation of the adhesive can be promoted by buoyancy or shaking. Therefore, by generating microbubbles in the stripping liquid 21a, the 1 st material M1 and the 2 nd material M2 can be efficiently stripped (separated). Furthermore, since the temperature of the peeling liquid 21a can be increased by the configuration in which microbubbles are generated using ultrasonic waves, the amount of heat applied by the heating unit 22 can be reduced, and the peeling liquid 21a can be heated with a small amount of energy.

The peeling section 20 is not limited to the above configuration. For example, the separation section 20 may include a separation liquid tank 51. The peeling unit 20 may include the hopper 13 described above.

[ Structure of centrifugal separation washing part ]

The centrifugal separation washing unit 30 further performs separation and collection (specific gravity difference separation) due to a specific gravity difference while washing the 1 st material M1 and the 2 nd material M2 separated by the peeling unit 20.

Specifically, the centrifugal separation washing section 30 includes a 1 st centrifugal separation section 31, a 2 nd centrifugal separation section 32, a 1 st washing tank 33, and a 2 nd washing tank 34. Here, the 1 st centrifugal separation unit 31 and the 2 nd centrifugal separation unit 32 are examples of centrifugal separation units. The 1 st rinsing bath 33 and the 2 nd rinsing bath 34 are examples of the separation section.

The 1 st centrifugal separation unit 31 is connected to a pipe T1. In the 1 st centrifugal separation section 31, the liquid flowing through the pipe T1 is supplied by the pump P1. The 2 nd centrifugal separation part 32 is connected to a pipe T2. In the 2 nd centrifugal separation part 32, the liquid flowing through the pipe T2 is supplied by the pump P2.

For example, when the valve V2 is opened and the valve V14 described later is closed, the peeling liquid 21a discharged from the peeling tank 21 is supplied to the 1 st centrifugal separation section 31. For example, when the valve V2 is closed and the valve V14 described later is opened, the washing water discharged from the 1 st and 2

nd wash tanks

33 and 34 is supplied to the 1 st centrifugal separation unit 31.

For example, when 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 2 nd centrifugal separation part 32. For example, when the valve V3 is closed and the valve V15 described later is opened, the washing water discharged from the 1 st and 2

nd wash tanks

33 and 34 is supplied to the 2 nd centrifugal separation unit 32.

The 1 st centrifugal separation section 31 is a centrifugal separator provided with a motor 31 a. The 1 st centrifugal separation section 31 extracts a crushed mixture contained in a liquid by centrifugally separating the liquid supplied through the pipe T1 using a motor 31a as a drive source. The 2 nd centrifugal separation section 32 is a centrifugal separator including a motor 32a, similarly to the 1 st centrifugal separation section 31. The 2 nd centrifugal separation section 32 takes a motor 32a as a drive source, and centrifugally separates the liquid supplied through the pipe T2, thereby extracting a crushed mixture contained in the liquid.

Further, the specific gravity difference separation by the peeling unit 20 and the specific gravity difference separation by the centrifugal separation/washing unit 30 described later contain a large amount of the 1 st material M1 in the liquid supplied to the 1 st centrifugal separation unit 31. In addition, the liquid supplied to the 2 nd centrifugal separation part 32 contains a large amount of the 2 nd material M2 by the same specific gravity difference separation. Therefore, hereinafter, the crushed mixture processed in the 1 st centrifugal separation section 31 (and the 1 st rinsing tank 33) is also referred to as a 1 st material M1, and the crushed mixture processed in the 2 nd centrifugal separation section 32 (and the 2 nd rinsing tank 34) is also referred to as a 2 nd material M2.

The 1 st centrifugal separation unit 31 and the 2 nd centrifugal separation unit 32 are connected to the separation liquid tank 51 through pipes T4, respectively. The pipe T4 is provided with a valve V5. When the valve V5 is in the open state, the liquid (the stripping liquid 21 a) centrifuged by the 1 st centrifugal separation unit 31 and the 2 nd centrifugal separation unit 32 is discharged to the stripping liquid tank 51 through the pipe T4.

The stripping liquid tank 51 is a container for storing the stripping liquid 21a. The stripping liquid 21a stored in the stripping liquid tank 51 can be supplied to the stripping tank 21 through the pipe T3.

The stripping liquid tank 51 is provided with a component concentration meter 51a for measuring the component concentration of the stripping liquid 21a. Further, a pipe T6 through which cleaning water flows via a valve V6 is connected to the stripping liquid tank 51. In the separation and collection apparatus 1, the stripping liquid 21a stored in the stripping liquid tank 51 can be adjusted to a desired component concentration by opening and closing the valve V6 based on the component concentration measured by the component concentration meter 51a, for example.

The 1 st centrifugal separation section 31 and the 2 nd centrifugal separation section 32 are connected to the 2 nd washing tank 62 via a pipe T5, respectively. The pipe T5 is provided with a valve V7. When the valve V7 is in the open state, the liquid (washing water) centrifuged by the 1 st centrifugal separation unit 31 and the 2 nd centrifugal separation unit 32 is discharged to the 2 nd washing water tank 62 through the pipe T5.

The 1 st centrifugal separation section 31 is connected to the 1 st rinsing tank 33 via a valve V8. The 2 nd centrifugal separation unit 32 is connected to the 2 nd wash tank 34 via a valve V9. When the valves V8 and V9 are opened, the crushed mixture separated by the 1 st centrifugal separation unit 31 and the 2 nd centrifugal separation unit 32 is discharged to the corresponding 1 st rinsing tank 33 and 2 nd rinsing tank 34, respectively.

The 1 st rinsing bath 33 and the 2 nd rinsing bath 34 are connected to the 1 st rinsing bath 61 and the 2 nd rinsing bath 62 via a pipe T6. A valve V10 is provided in a path connecting the 1 st rinsing tank 33 and the pipe T6. Further, a valve V11 is provided in a path connecting the 2 nd rinse tank 34 and the pipe T6.

Here, the 1 st and 2 nd

washing water tanks

61 and 62 are containers for storing washing water for washing the centrifugally separated material. Specifically, the 1 st washing water tank 61 stores washing water 61a supplied from an external water supply facility (not shown). The cleaning water 61a does not need to have a particular purity, and general industrial water, tap water, well water, or the like can be used as it is.

The 2 nd washing water tank 62 stores used washing water 61a used for washing as washing water 62 a. In addition, a component concentration meter 62b for measuring the component concentration of the cleaning water 62a is provided in the 2 nd cleaning water tank 62. Hereinafter, the washing water 61a and the washing water 62a are simply referred to as washing water without distinction.

A valve V12 is provided in a path connecting the 1 st cleaning water tank 61 and the pipe T6. A valve V13 is provided in a path connecting the 2 nd cleaning water tank 62 and the pipe T6. Further, a pump P4 for supplying the washing water stored in the 1 st washing water tank 61 and the 2 nd washing water tank 62 to the 1 st rinsing tank 33 and the 2 nd rinsing tank 34 is provided on the path of the pipe T6.

When the valve V12 is in the open state and the valve V13 is in the closed state, the pump P4 supplies the washing water 61a accumulated in the 1 st washing water tank 61 to the 1 st rinsing tank 33 and the 2 nd rinsing tank 34. When the valve V12 is closed and the valve V13 is open, the pump P4 supplies the washing water 62a stored in the 2 nd washing water tank 62 to the 1 st washing water tank 33 and the 2 nd washing water tank 34.

The 1 st rinsing tank 33 rinses the 1 st material M1 centrifugally separated by the 1 st centrifugal separation unit 31 with washing water supplied through the pipe T6. The 2 nd rinsing tank 34 rinses the 2 nd material M2 centrifugally separated by the 2 nd centrifugal separation unit 32 with rinsing water supplied through the pipe T6. The cleaning method is not particularly limited, and various cleaning methods can be employed.

For example, as shown in fig. 1, the 1 st rinsing tank 33 may be configured to include a motor 33a, and to wash (agitate) by rotating an agitator 33b such as a propeller provided in the washing water using the motor 33a as a drive source. Similarly, the 2 nd rinsing bath 34 may be configured to include a motor 34a, and to wash (agitate) by rotating an agitator 34b provided in the washing water using the motor 34a as a drive source. The washing methods may be different between the 1 st washing bath 33 and the 2 nd washing bath 34. The 1 st rinsing bath 33 and the 2 nd rinsing bath 34 may be cleaned by ultrasonic waves or the like.

The washing water in the 1 st rinsing bath 33 and the 2 nd rinsing bath 34 functions as a specific gravity separation liquid for separating the 1 st material M1 and the 2 nd material M2 by specific gravity difference separation, similarly to the above-described stripping liquid 21a. Specifically, the 1 st material M1 and the 2 nd material M2 stay at different positions (heights) in the 1 st rinsing bath 33 and the 2 nd rinsing bath 34 due to the difference in specific gravity between the 1 st material M1 and the 2 nd material M2 with respect to the washing water. For example, when water is used as the washing water, the 1 st material M1 remains above the washing water and the 2 nd material M2 remains below the washing water, as in the case of the MEA aqueous solution described above.

The 1 st and 2

nd rinsing tanks

33 and 34 are provided with drain ports (not shown) for returning the washing water to the 1 st and 2 nd

centrifugal separation units

31 and 32, respectively. The drain port is provided at a position (height) corresponding to the retention position of each of the 1 st and 2 nd materials M1 and M2. Specifically, in the 1 st rinsing bath 33 and the 2 nd rinsing bath 34, a pipe T7 connected to the pipe T1 is connected to an upper discharge port corresponding to the retention position of the 1 st material M1. In the 1 st rinsing bath 33 and the 2 nd rinsing bath 34, a pipe T8 connected to the pipe T2 is connected to a lower discharge port corresponding to the retention position of the 2 nd material M2. Thereby, the cleaning water containing a large amount of the 1 st material M1 is discharged from the pipe T7. In the pipe T8, the washing water containing a large amount of the 2 nd material M2 is discharged.

The pipe T7 is connected between the pump P1 and the valve V2 on the path of the pipe T1. Further, a valve V14 is provided near a connection portion of the pipe T7 with the pipe T1. Further, the pipe T8 is connected between the pump P2 and the valve V3 on the path of the pipe T2. Further, a valve V15 is provided near a connection portion of the pipe T7 with the pipe T2.

Here, by performing exclusive control so that one of the valves is opened in each of the groups of the valves V2 and V14, and the valves V3 and V15, the liquid supplied to the 1 st centrifugal separation unit 31 and the 2 nd centrifugal separation unit 32 can be switched to the stripping liquid 21a or the cleaning water.

As will be described later, the 1 st material M1 and the 2 nd material M2 separated from the washing water in the 1 st centrifugal separation unit 31 and the 2 nd centrifugal separation unit 32 are again put into the 1 st rinsing tank 33 and the 2 nd rinsing tank 34, whereby the centrifugation and the washing (specific gravity difference sorting) can be repeatedly performed. Thereby, the 1 st material M1 is collected in the 1 st rinsing bath 33, and the 2 nd material M2 is collected in the 2 nd rinsing bath 34.

The 1 st rinsing bath 33 is provided with a discharge port (not shown) for discharging the 1 st material M1 subjected to the cleaning and the specific gravity difference sorting to the drying section 40. The discharge port is connected to a pipe T9 connected to the drying unit 40. A valve V16 and a pump P5 are provided in the path of the pipe T9. When the valve V16 is opened, the pump P5 pumps up the washing water containing the 1 st material M1 from the 1 st washing-water tank 33 and supplies the washing water to the drying unit 40 (the 1 st drying unit 41).

The 2 nd rinsing bath 34 is also provided with a discharge port (not shown) for discharging the 2 nd material M2 after completion of the cleaning and the specific gravity difference sorting. The discharge port is connected to a pipe T10 connected to the drying unit 40. A valve V17 and a pump P6 are provided in the path of the pipe T10. When the valve V17 is in the open state, the pump P6 pumps up the washing water containing the 2 nd material M2 from the 2 nd rinsing tank 34 and supplies the washing water to the drying unit 40 (the 2 nd drying unit 42).

The centrifugal separation washing section 30 is not limited to the above-described configuration. For example, the centrifugal separation washing unit 30 may include the stripping liquid tank 51, the 1 st washing water tank 61, the 2 nd washing water tank 62, and the like.

The configuration of fig. 1 is not limited to the configuration in which the material washed and sorted by the centrifugal washing section 30 with a difference in specific gravity is supplied from the 1 st washing tank 33 and the 2 nd washing tank 34 to the drying section 40. For example, the material separated by each of the 1 st centrifugal separation unit 31 and the 2 nd centrifugal separation unit 32 may be supplied to the drying unit 40 by using a conveying device such as a conveyor belt.

In the configuration of fig. 1, the 1 st centrifugal separation unit 31 and the 2 nd centrifugal separation unit 32 are connected to the 2 nd washing water tank 62, but the 1 st rinsing tank 33 and the 2 nd rinsing tank 34 may be connected to the 2 nd washing water tank 62. This makes it possible to supply the washing water used in washing-

water tanks

1, 33 and 34 to washing-water tank 2 62.

[ Structure of drying part ]

The drying section 40 is an example of a drying section. The drying unit 40 performs a process of drying the 1 st material M1 and the 2 nd material M2 cleaned and specific gravity separated by the centrifugal separation and water washing unit 30, respectively.

Specifically, the drying unit 40 includes a 1 st drying unit 41 and a 2 nd drying unit 42.

The 1 st drying unit 41 dries the 1 st material M1 supplied from the centrifugal separation/washing unit 30 (the 1 st centrifugal separation unit 31) through the pipe T9. The 2 nd drying unit 42 dries the 2 nd material M2 supplied from the centrifugal washing unit 30 (the 2 nd centrifugal unit 32) through the pipe T10. The 1 st material M1 and the 2 nd material M2 dried by the drying unit 40 are collected according to the material type.

The drying method in the 1 st drying unit 41 and the 2 nd drying unit 42 is not particularly limited, and various drying methods can be used. For example, the 1 st drying unit 41 and the 2 nd drying unit 42 may be drying devices that perform drying by blowing warm air at about 90 ℃. The 1 st drying unit 41 and the 2 nd drying unit 42 may be drying devices that perform reduced-pressure drying by performing reduced-pressure exhaust on a closed container in which the 1 st material M1 or the 2 nd material M2 is stored.

Next, a separation and collection method performed by the separation and collection device 1 of the present embodiment will be described.

Fig. 2 is a flowchart showing an example of the process of the separation and collection method. As shown in fig. 2, the separation and collection method includes a crushing step S1, a peeling step S2, a centrifugal separation step S3, a water washing step S4, and a drying step S5. Here, the peeling step S2 is an example of the peeling step. The centrifugal separation step S3, the water washing step S4, and the drying step S5 are examples of the separation and collection step. The specific gravity difference sorting process performed in the separation step S2 may be configured to be included in the separation and collection step.

The respective steps of the separation and collection method described above are executed by a control device (not shown) having a computer structure, for example. The control device includes a computer structure such as a processor, a main storage device, and an auxiliary storage device, and executes each step of the above-described separation and collection method 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 open/close control of valves provided in each part of the separation and recovery device 1, the drive control of pumps, and the like, and also based on the sensing result of a sensor device, not shown, and the like.

The control device may be a single-configuration control device that collectively controls the operation of the separation and collection device 1, or may be a plurality of configurations that individually control the operation of each of the crushing unit 10, the peeling unit 20, the centrifugal separation and water washing unit 30, and the drying unit 40. In the present embodiment, the respective steps of the separation and collection method are described as being executed under the control of the control device, but the present invention is not limited thereto, and the respective steps may be executed by a human hand.

Hereinafter, the respective steps in fig. 2 will be described with reference to fig. 1 and fig. 3 to 5.

[ crushing step ]

The crushing step S1 is mainly performed by the crushing unit 10. In the crushing step S1, the composite material CM1 to be processed is crushed into a crushed material CM2, which is a small piece, by the crusher 11. The crushed material CM2 is conveyed to the hopper 13 by a conveying means such as a blower 12.

[ peeling Process ]

The peeling step S2 is mainly performed by the peeling section 20. In the peeling step S2, first, the control device closes the valves V2 and V3 and opens the valve V4, and drives the pump P3, so that the peeling liquid 21a stored in the peeling liquid tank 51 is supplied to the peeling 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 closes the valve V4. Next, the control device operates the heating unit 22 to heat (warm) the stripping solution 21a in the stripping tank 21 to a predetermined temperature.

Next, the control device puts the crushed material CM2 stored in the hopper 13 into the stripping liquid 21a in the stripping tank 21 by opening the valve V1. In the present embodiment, the mode is adopted in which the crushed material CM2 is introduced after the supply of the peeling liquid 21a, but the present invention is not limited to this, and the peeling liquid 21a may be supplied after the introduction of the crushed material CM2, for example.

When the supply of the crushed material CM2 to the peeling liquid 21a is completed, the control device drives the stirring unit 23 to stir the peeling liquid 21a. The frequency and area of contact between the layer of the adhesive contained in the crushed material CM2 and the peeling liquid 21a increase due to the stirring of the peeling liquid 21a. Further, by heating the peeling liquid 21a by the heating unit 22, the peeling liquid 21a easily penetrates into the layer of the adhesive contained in the crushed material CM2.

Accordingly, in the peeling section 20 (peeling step S2), the adhesive can be efficiently peeled from the crushed material CM2, and thus the 1 st material M1 and the 2 nd material M2 can be efficiently separated. In addition, since the adhesive can be removed from the crushed material CM2, the quality of the 1 st material M1 and the 2 nd material M2 separated and recovered can be improved.

Subsequently, the control device stops the heating unit 22 and the stirring unit 23 and allows the stripping liquid 21a to stand for a predetermined time. By the standing of the peeling liquid 21a, the 1 st material M1 and the 2 nd material M2 peeled off are separated to a position (height) corresponding to their specific gravities. Specifically, the 1 st material M1 having a low specific gravity is retained above the peeling groove 21, and the 2 nd material M2 having a high specific gravity is retained below the peeling groove 21. Here, the standing time for standing the peeling liquid 21a is not particularly limited. For example, the control device may adjust the standing time in accordance with the size of the crushed material CM2, the viscosity of the peeling liquid 21a, or the like.

Next, the control device opens the valve V2 (closes the valve V14), and drives the pump P1 to supply the stripping liquid 21a above the stripping tank 21 to the 1 st centrifugal separation unit 31. Further, the control device opens the valve V3 (closes the valve V15), and drives the pump P2 to supply the stripping liquid 21a below the stripping tank 21 to the 2 nd centrifugal separation part 32. Specifically, the 1 st centrifugal separation unit 31 mainly supplies the stripping liquid 21a containing the 1 st material M1, and the 2 nd centrifugal separation unit 32 mainly supplies the stripping liquid 21a containing the 2 nd material M2.

In the separation step S2, there is a possibility that the separation liquid 21a may be supplied to the 1 st centrifugal separation unit 31 and the 2 nd centrifugal separation unit 32 in a state where the other material is mixed due to the reason that the other material is mixed into the main group of the one material. Therefore, in the separation and collection method of the present embodiment, the separation treatment of the 1 st material M1 and the 2 nd material M2 is further performed in the centrifugal separation step and the water washing step, which will be described later.

[ centrifugal separation step and washing step ]

The centrifugal separation step S3 and the water washing step S4 are mainly performed by the centrifugal separation water washing unit 30. Hereinafter, the centrifugal separation step S3 and the water washing step S4 will be described with reference to fig. 3 to 5.

Fig. 3 to 5 are views for explaining the centrifugal separation step S3 and the water washing step S4. Arrows indicated by solid lines indicate the movement of the 1 st material M1 and the 2 nd material M2 to be collected. The arrows indicated by broken lines indicate the movement of the stripping liquid 21a. In addition, an arrow indicated by a one-dot chain line indicates the movement of the washing water. In fig. 3 to 5, the pipe in the opened state is indicated by a solid line, and the pipe in the unopened state is indicated by a broken line.

First, in the centrifugal separation step S3, as shown in fig. 3, the valves V2 and V3 are opened, and the valves V14 and V15 are closed. Then, the control device drives the pumps P1 and P2 to supply the stripping liquid 21a to the 1 st centrifugal separation unit 31 and the 2 nd centrifugal separation unit 32.

The motor 31a and the motor 32a are driven in the 1 st centrifugal separation section 31 and the 2 nd centrifugal separation section 32, respectively, to centrifugally separate the supplied stripping liquid 21a into a liquid (stripping liquid 21 a) and a solid (crushed mixture). At this time, the control device opens the valve V5 to discharge the stripping liquid 21a separated by each of the 1 st centrifugal separation unit 31 and the 2 nd centrifugal separation unit 32 to the stripping liquid tank 51. This enables reuse of the stripping liquid 21a used in the 1 st centrifugal separation unit 31 and the 2 nd centrifugal separation unit 32, thereby reducing running costs.

When the centrifugal separation by the 1 st centrifugal separation part 31 and the 2 nd centrifugal separation part 32 is completed, the control device opens the valves V8 and V9, and the separated crushed mixture is discharged to the 1 st and 2

nd wash tanks

33 and 34.

In the next water washing step S4, as shown in fig. 4 or 5, the controller washes the crushed mixture in the 1 st washing water tank 33 and the 2 nd washing water tank 34 using the washing water supplied from the 1 st washing water tank 61 or the 2 nd washing water tank 62. Subsequently, the controller causes the washing water in the 1 st washing-with-water tank 33 and the 2 nd washing-with-water tank 34 to stand, thereby performing the specific gravity difference sorting of the 1 st material M1 and the 2 nd material M2 in the same manner as in the peeling unit 20 described above.

Next, the control device opens the valve V14 with the valve V2 closed, and supplies the 1 st centrifugal separation unit 31 with the 1 st washing water containing the 1 st material M1 from the 1 st washing water tank 33 and the 2 nd washing water tank 34, respectively. The control device also supplies the washing water containing the 2 nd material M2 from the 1 st and 2

nd washing tanks

33 and 34 to the 2 nd centrifugal separation unit 32 by closing the valve V3 and opening the valve V15. The control device repeatedly performs the separation of the 1 st material M1 and the 2 nd material M2 by performing the centrifugation step S3 and the water washing step S4 using the washing water a predetermined number of times.

In addition, when the centrifugal separation step S3 is performed using the washing water, the control device controls the valve V5 to be closed and the valve V7 to be opened so that the washing water centrifugally separated is discharged to the 2 nd washing water tank 62. This allows the washing water used in the 1 st centrifugal separation unit 31 and the 2 nd centrifugal separation unit 32 to be reused as the washing water 62a, thereby reducing the amount of water used for washing and reducing the running cost.

It is preferable that the washing process S4 at the beginning (or the first few times) is performed using the washing water 62a stored in the 2 nd washing water tank 62, and the washing process S4 at the ending stage is performed using the washing water 61a stored in the 1 st washing water tank 61. In this case, the control device may execute the centrifugal separation step S3 and the water washing step S4, for example, in accordance with the following procedure.

First, as shown in fig. 4, by opening the valve V10, the valve V11, and the valve V13 and closing the valve V12, the washing water 62a stored in the 2 nd washing water tank 62 is supplied to the 1 st washing water tank 33 and the 2 nd washing water tank 34 by the pump P4. Further, at this time, the valves V14 and V15 are in the closed state.

When the supply amount of the washing water 62a reaches a predetermined amount, the control device closes the valves V10, V11, and V13, and stops the pump P4. Subsequently, the controller operates the 1 st rinsing bath 33 and the 2 nd rinsing bath 34, and starts the washing with the supplied washing water 62 a.

When washing is performed for a predetermined time, the control device stops the operations of the 1 st rinsing bath 33 and the 2 nd rinsing bath 34 and allows the washing water 62a to stand for a predetermined time.

Next, the controller opens the valve V14 and drives the pump P1 to supply the washing water 62a above the 1 st and 2

nd wash tanks

33 and 34 to the 1 st centrifugal separation unit 31. Further, the control device opens the valve V15 and drives the pump P2 to supply the washing water 62a under the 1 st and 2

nd wash tanks

33 and 34 to the 2 nd centrifugal separation unit 32.

Next, in the 1 st centrifugal separation section 31 and the 2 nd centrifugal separation section 32, a centrifugal separation step S3 of separating the liquid (the washing water 62 a) and the solid (the 1 st material M1, the 2 nd material M2) is performed in the same manner as described above. Here, the centrifugally separated washing water 62a may be discarded or may be discharged to the 2 nd washing water tank 62. Further, the solids separated by centrifugation are again put into the 1 st and 2

nd rinsing tanks

33 and 34. The water washing step S4 using the washing water 62a may be performed one or more times.

When the water washing step S4 using the washing water 62a is performed a predetermined number of times, the water washing step S4 using the washing water 61a of the 1 st washing water tank 61 is performed one or more times as the final washing.

Specifically, as shown in fig. 5, the valve V10, the valve V11, and the valve V12 are opened, and the valve V13 is closed, so that the washing water 61a stored in the 1 st washing water tank 61 is supplied to the 1 st rinsing tank 33 and the 2 nd rinsing tank 34 by the pump P4. At this time, the valves V14 and V15 are in the closed state.

When the supply amount of the washing water 61a reaches a predetermined amount, the control device closes the valves V10, V11, and V12, and stops the pump P4. Subsequently, the controller operates the 1 st rinsing bath 33 and the 2 nd rinsing bath 34, and starts the washing with the supplied washing water 61a.

Here, the control device may be configured as follows: after the washing for a predetermined time, the 1 st and 2 nd materials M1 and M2 selected by specific gravity separation are returned to the 1 st and 2 nd

centrifugal separation units

31 and 32 again in the same manner as described above. In this case, in the centrifugal separation step S3, the control device closes the valve V5 and opens the valve V7, thereby discharging the centrifugally separated washing water 61a as the washing water 62a to the 2 nd washing water tank.

The control device may transfer the 1 st material M1 and the 2 nd material M2, which have been subjected to the cleaning and the specific gravity separation selection, to the drying step S5. In this case, the controller opens the valve V16 and drives the pump P5 to supply the 1 st material M1 deposited in the 1 st rinsing tank 33 to the 1 st drying unit 41 together with the washing water 61a. Similarly, the controller drives the pump P6 with the valve V17 opened, so that the 2 nd material M2 deposited in the 2 nd rinsing tank 34 is supplied to the 2 nd drying unit 42 together with the washing water 61a.

As described above, in the separation and collection method according to the present embodiment, the centrifugal separation step S3 and the water washing step S4 are performed a plurality of times, and thereby the washing and the specific gravity difference sorting of the 1 st material M1 and the 2 nd material M2 are repeatedly performed. Thus, in the separation and collection method of the present embodiment, the degree of cleaning of the 1 st material M1 and the 2 nd material M2 can be improved, and the separation accuracy of the 1 st material M1 and the 2 nd material M2 can be improved. Therefore, in the separation and collection method of the present embodiment, the 1 st material M1 and the 2 nd material M2 can be separated and collected efficiently, and the quality of the 1 st material M1 and the 2 nd material M2 separated and collected can be improved.

In the separation and collection method according to the present embodiment, the separation liquid 21a used for the separation of the material can be reused, and the cleaning water 61a used for cleaning the material can be reused as the cleaning water 62 a. Therefore, in the separation and collection method of the present embodiment, the amount of water of the stripping liquid 21a used for stripping the material and the amount of water used for cleaning the material can be reduced, and therefore the material can be efficiently separated and collected.

[ drying Process ]

The drying step S5 is mainly performed by the drying section 40. In the drying step S5, the 1 st material M1 and the 2 nd material M2 cleaned in the water cleaning step S4 and sorted out by the difference in specific gravity are dried. The drying step S5 will be described below with reference to fig. 5.

The control device drives the 1 st drying unit 41 to dry the 1 st material M1 supplied from the centrifugal separation washing unit 30, thereby collecting the 1 st material M1. The control device drives the 2 nd drying unit 42 to dry the 2 nd material M2 supplied from the centrifugal separation washing unit 30, thereby recovering the 2 nd material M2.

As described above, in the separation and collection apparatus 1 of the present embodiment, the following separation step is performed: a separation liquid 21a containing a composite material crushed material CM2 obtained by laminating a plurality of materials with an adhesive and an MEA aqueous solution is heated and stirred to obtain a crushed mixture obtained by separating the adhesive from the crushed material. Thus, in the separation and collection device 1, the adhesive can be easily peeled from the crushed material CM2, and thus, the separation of a plurality of materials can be efficiently performed.

In the separation and collection device 1 of the present embodiment, the crushed mixture is separated into a plurality of materials by specific gravity difference separation in the separation step or the water washing step. Thus, in the separation and recovery apparatus 1, the plurality of materials dispersed by the peeling of the adhesive can be separated based on the specific gravity thereof.

In the separation and collection apparatus 1 of the present embodiment, the adhesive is separated from the crushed material CM2 using an MEA aqueous solution (separation liquid 21 a) having an MEA content of 2 wt% or more and 100 wt% or less. Thus, in the separation and collection apparatus 1, since the risk and toxicity of the MEA can be reduced, safety can be improved.

In the separation and collection apparatus 1 of the present embodiment, the MEA aqueous solution (the separation liquid 21 a) containing at least one of the alkaline earth metal and the alkali metal is used to separate the adhesive from the crushed material CM2. Thus, in the separation and collection device 1, since the separation of the adhesive from the crushed material CM2 can be promoted, the separation of the plurality of materials can be efficiently performed.

In the separation and recovery apparatus 1 of the present embodiment, microbubbles are generated in the stripping liquid 21a and the stripping liquid 21a is stirred. Thus, in the separation and collection device 1, since the separation of the adhesive from the crushed material CM2 can be promoted, the separation of the plurality of materials can be efficiently performed.

(modification 1)

In the above embodiment, the two types of materials to be collected (the 1 st material M1 and the 2 nd material M2) are used, and thus a configuration is provided in which a set of two centrifugal separation units and a water washing unit is prepared.

For example, when 3 types of materials to be collected (however, different specific gravities) are used, 3 sets of a centrifugal separation unit and a water washing unit are prepared. Further, in the peeling tank 21, discharge ports are provided at positions (heights) corresponding to specific gravities of the respective materials, and pipes for connecting the discharge ports to the centrifugal separation portions of the respective groups are provided. In addition, in the washing sections of the respective groups, discharge ports are provided at positions (heights) corresponding to specific gravities of the respective materials, and pipes connected to the centrifugal separation sections of the groups in charge of the sorting of the specific gravities are provided. Thus, the respective materials peeled (separated) in the peeling tank 21 can be separated and collected by the drying section 40 connected to the centrifugal separation sections of the respective groups.

(modification 2)

In the above-described embodiment, the separation and recovery apparatus 1 (separation and recovery method) including the crushing unit 10 (crushing step S1) has been described, but for example, when the crushed composite material CM1 is prepared in advance, the crushing unit 10 (crushing step S1) may be eliminated. In this case, the same effect as that of the above-described embodiment can be obtained by treating the composite material CM1 (crushed material CM 2) that has been crushed in advance in the peeling section 20 (peeling step S2).

(modification 3)

In the above embodiment, the stripping liquid 21a contains at least one of an alkaline earth metal and an alkali metal as an additive, but may not contain either of an alkaline earth metal and an alkali metal. In this case, the function of the additive (activator) is lacking as compared with the above embodiment, but the following advantages can be obtained.

First, when the stripping liquid 21a contains an alkaline earth metal or an alkali metal, the synthetic resin (PET or the like) or the metal (AL or the like) to be recovered may be damaged. Specifically, since the alkaline earth metal or the alkali metal has an action of decomposing the synthetic resin, there is a possibility that the synthetic resin is deteriorated in the peeling step S2. Further, AL is changed to aluminum hydroxide or alumina by the reaction of alkaline earth metal or alkali metal with AL, and the risk of explosion or the like due to hydrogen generation increases. Therefore, by adopting a structure that does not use alkaline earth metals or alkali metals, the quality and safety of the recovered material can be improved.

In the case where the drying under reduced pressure is performed in the drying step S5, since the alkaline earth metal and the alkali metal of the inorganic substance do not volatilize and remain, the alkaline earth metal and the alkali metal are mixedly present in the material to be recovered. Therefore, by adopting a structure that does not use alkaline earth metals or alkali metals, it is possible to reduce the residue other than the material to be recovered, and therefore it is possible to improve the quality of the recovered material.

Further, if the stripping liquid 21a contains an alkaline earth metal or an alkali metal, the treatment at the time of final disposal of the stripping liquid 21a becomes complicated. On the other hand, when the release liquid 21a does not contain an alkaline earth metal or an alkali metal, the MEA as a main component can be burned, and thus can be mixed with another fuel to be subjected to a combustion treatment. Therefore, the configuration without using an alkaline earth metal or an alkali metal can reduce the burden of disposing the stripping liquid 21a.

Although the embodiment and the modifications of the present invention have been described above, these embodiments and modifications are provided as examples and are not intended to limit the scope of the present invention. These novel embodiments and modifications can be implemented in other various forms, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

Description of the reference numerals

1. A separation and recovery device; 10. a crushing section; 11. a crusher; 12. a blower; 13. a hopper; 20. a peeling section; 21. a stripping groove; 22. a heating part; 23. a stirring section; 30. a centrifugal separation water washing part; 31. the 1 st centrifugal separation part; 32. a 2 nd centrifugal separation part; 33. a 1 st rinsing bath; 34. a 2 nd rinsing bath; 40. a drying section; 41. a 1 st drying part; 42. a 2 nd drying part; 51. a stripping liquid tank; 61. 1, cleaning a water tank; 62. and 2, cleaning the water tank.

Claims

1. A separation and recovery method, wherein the separation and recovery method comprises:

and a stripping step in which a treatment liquid containing a composite material crushed product formed by laminating a plurality of materials and a monoethanolamine aqueous solution is heated and stirred to obtain a crushed mixture obtained by stripping the layers of the materials contained in the crushed product.

2. The separation and recovery method according to claim 1,

3. The separation and recovery method according to claim 1 or 2, wherein,

4. The separation and recovery method according to any one of claims 1 to 3, 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,

6. The separation and recovery method according to claim 5,

7. The separation and recovery method according to claim 2,

the separation and recovery process includes:

a centrifugation step of centrifuging the treatment liquid containing the crushed mixture;

a separation step of separating the materials by type 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 step; and

a drying step of drying each of the materials separated in the separation step.

8. A separation and recovery device, comprising:

a peeling unit that heats and stirs a treatment liquid containing a composite material crushed product formed by laminating a plurality of materials and a monoethanolamine aqueous solution to obtain a crushed mixture formed by peeling layers of the materials contained in the crushed product;

a centrifugal separation section that centrifugally separates the treatment liquid containing the disrupted mixture;

a separation section that separates the materials by type 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 separating section.