CN111978593B - Waste foamed polystyrene recovery device and recovery method - Google Patents

Abstract

The invention discloses a waste foam polystyrene recovery device and a recovery method, comprising a floating disc treatment device, a precipitation tank and an extraction tank; the recovery process comprises cutting polystyrene foam using a high pressure ethyl acetate stream; steps of dissolving polystyrene foam using ethyl acetate and recovering ethyl acetate. The invention can complete the segmentation and the dissolution of the waste bleaching plate or the polystyrene foam board under the completely closed condition, is safe and clean, does not generate dust and toxic gas when the waste bleaching plate or the polystyrene foam board is treated, and only needs to treat the bleaching plate cleanly in advance. The polystyrene obtained by precipitation after dissolution has a volume of only 1/40 of that of the polystyrene foam.

Description

Waste foamed polystyrene recovery device and recovery method

Technical Field

The invention belongs to the field of renewable resource treatment equipment, and relates to float plate treatment equipment.

Background

The flue-cured tobacco bleaching trays are usually disposable, basically discarded after seedling and transplanting, and no good treatment mode is available for piling in a storehouse.

The material of the flue-cured tobacco bleaching tray is polystyrene, and the polystyrene foam plastic is non-degradable white pollution, the density of the flue-cured tobacco bleaching tray is only about 20kg per cubic meter, the density is small, the weight is light, and the flue-cured tobacco bleaching tray cannot be treated in a landfill mode.

The prior art includes various patent technologies of waste plastics, such as waste plastic recycling machines, mostly thermoplastic screw extrusion, and the waste plastics are formed by shearing extrusion after being heated and melted in a machine. The main disadvantages are as follows: 1. the foam plastic waste has small apparent density, low heat conductivity coefficient, high transportation cost during recycling, high energy consumption and poor benefit; 2. high temperature melting in the machine causes plastic aging and poor quality.

The prior art also discloses a waste polystyrene foam plastic recovery process, which adopts (toluene): v (dichloroethane) = (0.8 to 0.9) as a solvent to dissolve the waste polystyrene foam, the solvent is toxic, and toluene is a 3-class carcinogen.

The prior art also discloses a crushing device for polystyrene foam, which uses a crushing knife to crush. Because polystyrene is light in weight, the polystyrene is easy to fly after pelleting, and the air quality of workshops is very poor.

Disclosure of Invention

In view of the above, the invention aims to provide a waste foamed polystyrene recovery device, which is used for treating waste agricultural floating trays, has no pollution and is safe for people.

The invention further aims to provide a waste foam polystyrene recovery method, which uses nontoxic ethyl acetate as a dissolution liquid, and the consumption of ethyl acetate is only 3% by recycling ethyl acetate, so that the method is energy-saving and environment-friendly.

The inventor continuously reforms and innovates through long-term exploration and trial and repeated experiments and efforts, and in order to solve the technical problems, the technical scheme provided by the invention is that a waste foam polystyrene recovery device is provided, wherein the polystyrene foam is an agricultural floating disc and comprises a floating disc treatment device, a precipitation tank and an extraction tank;

the bleaching disc treatment device comprises a bleaching disc support for supporting bleaching discs, a second box body for containing ethyl acetate, and a solvent cutting device for cutting the bleaching discs, wherein the solvent cutting device comprises a high-pressure spray head for spraying the solvent, and a first box body for receiving the cut bleaching disc fragments and the solvent;

the first box passes through the pipeline connection precipitation tank, the precipitation tank passes through the pipeline connection extraction tank, the extraction tank passes through the pipeline connection second box.

According to one embodiment of the waste foamed polystyrene recovery device of the invention, the device further comprises a spraying device for spraying the solvent to the waste agricultural bleaching plate.

According to one embodiment of the waste foamed polystyrene recovery device, the first box body and the second box body are integrally arranged, and the first box body is communicated with the second box body through a filter screen, a filter membrane or a filter plate.

According to one embodiment of the waste foamed polystyrene recovery device, the solvent cutting device comprises a first liquid inlet pipe, a first pump, a first liquid outlet pipe and a high-pressure spray head which are connected in sequence; the free end of the first liquid inlet pipe is positioned in the second box body.

According to one embodiment of the waste foamed polystyrene recovery device, the spraying device comprises a second liquid inlet pipe, a second pump and a second liquid outlet pipe which are connected in sequence, and the free end of the second liquid inlet pipe is positioned in the second box body.

According to one embodiment of the apparatus for recycling waste styrofoam according to the present invention, a heating means for heating the solvent is further included.

According to one embodiment of the waste foamed polystyrene recovery device, a tray inlet is formed in the first box body, and a tray inlet rail is arranged on the tray inlet; the floating disc support comprises a disc feeding rail, a clamping groove is formed in the disc feeding rail, one end of the disc feeding rail is arranged outside the first box body, and the other end of the disc feeding rail is arranged in the first box body; the high-pressure spray head is arranged in the first box body; the high-pressure spray head is positioned right above the tail end of the disc feeding rail; a reflow hole is arranged in the first box body of the tray inlet rail near the tray inlet end; the high-pressure spray head is a rotary spray head or a sliding spray head.

According to one embodiment of the waste foamed polystyrene recovery device, a ceramic filter core plate is horizontally arranged in a pipe body of the precipitation tank, a precipitation tank is arranged above the ceramic filter core plate, and a suction filtration tank is arranged below the ceramic filter core plate; the sedimentation tank is provided with a dissolution liquid inlet and an ethanol adding port, and the suction filtration tank is provided with a sedimentation outlet and a suction filtration port; a scraper is arranged on the ceramic filter core plate; the dissolving liquid inlet of the precipitation tank is communicated with the first tank body through a pipeline; and a suction port of the suction box is communicated with the extraction tank through a pipeline.

According to one embodiment of the waste foamed polystyrene recovery device, the extraction tank is provided with a mixed liquor inlet, an extraction liquor adding port, a liquid discharge port and a recovery port; the mixed liquid inlet is communicated with the suction filtration port through a pipeline; the recycling port is communicated with the second box body through a pipeline.

The invention also provides a waste foam polystyrene recycling method based on the device, which comprises the following steps:

s1: the waste polyethylene foam is cleaned up and the waste polyethylene foam is removed,

s2: cutting the polystyrene foam using a high pressure ethyl acetate stream;

s3: dissolving polystyrene foam by using ethyl acetate to obtain a dissolving solution; the dissolution temperature is set to be 45-50 ℃;

s4: adding ethanol into the dissolution solution to obtain polystyrene precipitate, and carrying out solid-liquid separation to obtain polystyrene and a mixed solution of ethyl acetate and ethanol;

s5: adding saturated sodium carbonate into the mixed solution of ethyl acetate and ethanol for extraction, and separating to obtain ethyl acetate and ethanol sodium carbonate aqueous solution;

s6: the ethyl acetate obtained in step 5 was recycled for cutting and dissolving polystyrene foam.

Compared with the prior art, one of the technical schemes has the following advantages:

a) According to the invention, the technology of cutting and dissolving the floating disc is combined by using the solvent capable of dissolving the polystyrene, so that flying particles are not generated when the floating disc is cut, the floating disc can be cut into thin slices or fine particles, and the floating disc can be dissolved in the solvent more quickly.

b) In one embodiment of the invention, the polystyrene is dissolved by using ethyl acetate, so that the polystyrene is safe and nontoxic, and the polystyrene is separated and extracted after the polystyrene is completely dissolved by using ethyl acetate.

c) In one embodiment of the invention, the cutting device is arranged in the box body, and the whole process of decomposing and dissolving the floating disc can be completed in a completely closed environment, so that the device is safe and clean.

d) In one embodiment of the invention, the solvent may be heated by providing a heating device. The ethyl acetate is heated to about 50 ℃ so as to be beneficial to improving the dissolution rate of the polystyrene.

e) In one embodiment of the invention, the floating disc is sprayed in the first box body through the solvent spraying device and then cut through the cutting device, namely, the floating disc is initially dissolved before cutting, which is beneficial to shortening the dissolution time.

f) In one embodiment of the invention, the polystyrene is recovered simply, conveniently and quickly, and all solvents can be recycled, so that the method is environment-friendly, energy-saving and environment-friendly.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic top view of a waste polystyrene foam recycling device of the present invention.

Fig. 2 is a schematic perspective view of fig. 1.

Fig. 3 is a schematic perspective view of another view of fig. 1.

FIG. 4 is a schematic front view of a preferred embodiment of a float plate treatment device in a waste polystyrene foam recovery device of the present invention.

Fig. 5 is a left side schematic view of fig. 4.

Fig. 6 is a right side view schematic of fig. 4.

Fig. 7 is a schematic top view of fig. 4.

Fig. 8 is a schematic perspective view of fig. 4.

Fig. 9 is a schematic cross-sectional view of A-A in fig. 5.

FIG. 10 is a schematic cross-sectional view of B-B in FIG. 4.

Fig. 11 is a perspective schematic view of the stereoscopic mechanism of fig. 4.

FIG. 12 is a schematic top view of the extraction tank of the waste polystyrene foam recovery device of the present invention.

FIG. 13 is a schematic cross-sectional view of C-C in FIG. 12.

FIG. 14 is a schematic cross-sectional view of D-D in FIG. 12.

The marks in the figure are respectively: 100 the floating disc treatment device,

110. the first box body is provided with a first box body,

111. a disc inlet is arranged on the disc inlet,

112. a disc feeding rail is arranged on the disc feeding rail,

113. the clamping groove is provided with a clamping groove,

114. the sliding rail is provided with a plurality of sliding rails,

115. a discharging hole is arranged on the inner side of the shell,

116. the backflow hole is provided with a plurality of holes,

120. a second box body is arranged on the upper surface of the first box body,

121. the liquid adding hole is arranged on the bottom of the liquid adding pipe,

130. a filter plate,

2. a floating disc is arranged on the upper surface of the floating disc,

310. the first liquid outlet pipe is provided with a liquid outlet pipe,

311. the first liquid inlet pipe is provided with a first liquid inlet pipe,

312. the first pump is used for pumping the liquid,

313. a high-pressure spray head is arranged on the upper surface of the shell,

320. a second liquid outlet pipe is arranged on the upper surface of the first liquid outlet pipe,

321. a second liquid inlet pipe is arranged on the second liquid inlet pipe,

322. a second pump;

400. a settling tank, a sedimentation tank,

401. a dissolving liquid inlet,

402. an ethanol adding port, a water inlet and a water outlet,

403. a sediment discharge port,

404. a suction filtration port is arranged on the bottom of the filter,

410. a rotating shaft is arranged on the upper part of the rotating shaft,

411. a scraper blade, which is provided with a scraper,

420. a ceramic filter core plate,

421. a precipitation collecting tank is arranged on the bottom of the sedimentation collecting tank,

430. the motor is arranged on the side of the motor,

500. an extraction tank is arranged on the bottom of the extraction tank,

501. a mixed liquid inlet is arranged on the inner side of the mixing tank,

502. an extraction liquid adding port is arranged on the bottom of the extraction liquid container,

503. a liquid discharge port is arranged on the bottom of the liquid tank,

504. and recovering the mouth.

Detailed Description

The following description is of one embodiment with reference to the accompanying drawings.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without creative efforts, are within the scope of the protection of the present invention. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

It should be noted that: like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it may not be further defined and explained in the following figures.

The method for recycling the waste foamed polystyrene mainly comprises the following steps:

s1: cleaning the waste polyethylene foam. And cleaning off the culture medium such as soil on the flue-cured tobacco bleaching tray and organic matters such as roots, leaves, weeds and the like on the bleaching tray.

S2: the polystyrene foam is cut using a stream of ethyl acetate sprayed from a high pressure spray head, allowing the polyethylene foam to be broken into particles or flakes that are more easily dissolved quickly and completely.

S3: dissolving polystyrene foam by using ethyl acetate to obtain a dissolving solution; the dissolution temperature is set to be 45-50 ℃;

s4: adding ethanol into the dissolution solution to obtain polystyrene precipitate, and carrying out solid-liquid separation to obtain polystyrene and a mixed solution of ethyl acetate and ethanol;

s5: adding saturated sodium carbonate into the mixed solution of ethyl acetate and ethanol for extraction, and separating to obtain ethyl acetate and ethanol sodium carbonate aqueous solution;

s6: the ethyl acetate obtained in step 5 was recycled for cutting and dissolving polystyrene foam. Ethanol and sodium carbonate can be recycled for recycling waste foamed polystyrene. The invention uses the similar compatibility principle of the compound, the whole process has no chemical reaction, and all solvents used in the method can be recycled, so that the method is harmless to the environment and people.

The recovery method is realized based on the following waste foamed polystyrene recovery device. See fig. 1-14. The waste foamed polystyrene recycling device described in this embodiment includes a waste agricultural bleaching plate treatment device 100, a precipitation tank 400 and an extraction tank 500. The waste agricultural floating disc can be understood as a polystyrene plate and a polystyrene foam package, and can also be cut into foam plates in advance, so that the device is used for treatment. In this embodiment, the waste agricultural floating disc treatment device and the floating disc treatment device are the same concept.

Specifically, the float tray treatment apparatus 100 includes a float tray holder for supporting a waste agricultural float tray, a second tank 120 for holding a solvent capable of dissolving a polystyrene, a solvent cutting apparatus for cutting the float tray, and a high pressure spray head 313 for spraying the solvent, the solvent cutting apparatus including a first tank 110 for receiving the cut float tray pieces and the solvent. In this embodiment, the first case 110 and the second case 120 are connected to form a large case. That is, the first tank 110 and the second tank 120 are communicated with each other through a filter screen or a filter membrane or a filter plate 130, or the tank may be divided into the first tank 110 and the second tank 120 through the filter plate 130. The solvent for dissolving polystyrene is nontoxic ethyl acetate, polystyrene is dissolved in the first box 110, and the ethyl acetate of the first box 110 is filtered into the second box 120 through the filter plate 130. The first case 110 is provided with a discharge hole 115, and the second case 120 is provided with a filling hole 121. The discharge hole 115 is used for discharging the dissolution liquid in the first tank 110. The filling hole 121 is used to add a solvent for dissolving polystyrene, i.e., ethyl acetate as described in this embodiment, to the second casing 120.

The solvent cutting device comprises a first liquid inlet pipe 311, a first pump 312, a first liquid outlet pipe 310 and a high-pressure spray nozzle 313 which are sequentially connected. The free end of the first liquid inlet pipe 311 is located in the second box 120, and is used for sucking ethyl acetate in the second box 120, the ethyl acetate passes through the first liquid inlet pipe 311, the first pump 312 and the first liquid outlet pipe 310, and finally, high-pressure ethyl acetate flows are sprayed out through the high-pressure collision head 313, so that the floating disc 2 is cut into thin slices, and the thinner the slices are, the more favorable the dissolution time of polystyrene foam is shortened. The thickness of the sheet may be set to 0.1-2mm. One end of the first liquid inlet pipe 311 is connected with the first pump 312, and the other end is a free end.

In order to shorten the dissolution time of the polystyrene, the waste agricultural bleaching plate treatment device further comprises a spraying device for spraying ethyl acetate to the waste agricultural bleaching plate 2. The spraying device comprises a second liquid inlet pipe 321, a second pump 322 and a second liquid outlet pipe 320 which are sequentially connected, and the free end of the second liquid inlet pipe 321 is positioned in the second box body and is used for sucking ethyl acetate. One end of the second liquid inlet pipe 321 is connected with the second pump 322, and the other end is a free end. The liquid outlet end of the second liquid outlet pipe 320 is positioned above the bleaching disc 2, ethyl acetate is sprayed to the bleaching disc 2, the planting holes on the bleaching disc can contain ethyl acetate, and before the bleaching disc is cut, part of polystyrene can be pre-dissolved. A spray head can be arranged at the liquid outlet end of the second liquid outlet pipe 320 to spray ethyl acetate to the floating disc, so that the final planting hole of the floating disc is filled with ethyl acetate, and polystyrene outside the floating disc is dissolved; the high-pressure spray head can be arranged to spray the floating disc 2, and ethyl acetate is sprayed into the floating disc to dissolve part of polystyrene in the floating disc. By dissolving, the polystyrene sheet cut by the solvent cutting device can be reduced.

The first box 110 is provided with a disc inlet 111, and a disc inlet rail 112 is installed on the disc inlet 111. The cross section of the tray feeding rail 112 is in a groove shape, the width is equal to the width of the floating tray 2, the height is equal to the width of the floating tray 2, and the length is several times the length of the floating tray 2. The float tray support comprises a tray feeding rail 112, wherein a clamping groove 113 is formed in the tray feeding rail 112, the clamping groove 113 is formed in the upper edge of the tray feeding rail 112 and is used for placing a float tray to float or tilt and positioning the float tray 2, that is, the float tray 2 can only slide along the length direction of the tray feeding rail 112. One end of the tray feeding rail 112 is arranged outside the first box 110, the other end of the tray feeding rail 112 is arranged in the first box 110, and the houses of the floating tray 2 are arranged on the tray feeding rail 112 outside the first box 110 to push the floating tray 112 into the first box 110.

The high-pressure nozzle 213 is disposed in the first housing 110 and located directly above the end of the feeding rail 112, and the ticket tray 2 is pushed to the end of the feeding rail 112 and is cut by the high-pressure nozzle 213 mounted just above. The high-pressure nozzle 213 may be a rotary nozzle or a sliding nozzle. The sliding type spray head is horizontally provided with a sliding rail 114 in the first box body 110, the sliding type spray head is in sliding fit with the sliding rail 114, and the sliding direction of the sliding type spray head is perpendicular to the advancing direction of the floating disc.

A row of reflux holes 116 are arranged in the first box body of the tray inlet rail near the tray inlet end, so that ethyl acetate is prevented from flowing out from the tray inlet 111.

In order to accelerate the dissolution rate of polystyrene, the waste agricultural floating disc treatment device can be provided with a heating device (not shown in the drawing) for heating ethyl acetate, so that the temperature of the dissolution liquid in the first box body is maintained to be about 50 ℃. The heating device can be arranged in the first box body, or the bottom and the side wall of the first box body, or can be arranged in the second box body, or the bottom and the side wall of the second box body, or can be arranged in the first liquid inlet pipe, the first liquid outlet pipe, the second liquid inlet pipe and the second liquid outlet pipe.

In this embodiment, a ceramic filter core plate 420 is horizontally disposed in the tank body of the precipitation tank 400, a precipitation tank is disposed above the ceramic filter core plate 420, and a suction filtration tank is disposed below the ceramic filter core plate 420. The precipitation tank 420 is provided with a dissolution liquid inlet 401 and an ethanol adding port 402, and the suction filtration tank is provided with a precipitation outlet 403 and a suction filtration port 404; the ceramic filter core 420 is provided with a scraper 411, and the scraper 411 is in transmission connection with the motor 430 through a rotating shaft 410. The dissolving liquid inlet 401 of the settling tank is communicated with the discharge hole 115 of the first tank body through a pipeline, and a valve or a pump can be arranged on the pipeline according to requirements. The suction port 404 of the suction box is communicated with the mixed liquor inlet 501 of the extraction tank 500 through a pipeline, and a valve and a vacuum pump are arranged on the pipeline. A precipitation collection tank 421 is provided on the ceramic filter element 420, and the precipitation collection tank 421 communicates with the precipitation discharge outlet 403. After the ethyl acetate solution in which the polystyrene is dissolved is transferred from the first box 110 to the extraction tank 400, standing for 3 minutes until the solution is clear, adding 95% ethanol for precipitation, and performing vacuum filtration after the precipitation is completed to obtain the polystyrene. The secondary precipitation is performed by adding absolute ethyl alcohol again, after the complete precipitation, vacuum filtration is performed, solid polystyrene is left on the ceramic filter core plate 420, the polystyrene is pushed into the precipitation collection tank 421 using the scraper 411, and the solid polystyrene is removed from the precipitation discharge port 403.

The ethyl acetate ethanol solution filtered by suction is transferred to the extraction tank 500 for extraction of ethyl acetate. The extraction tank 500 is provided with a mixed liquid inlet 501, an extraction liquid addition port 502, a liquid discharge port 503, and a recovery port 504. The recovery port 504 is communicated with the liquid adding hole 121 of the second box body through a pipeline. Recovery port 504 is a channel for recovering ethyl acetate. In the embodiment, the extraction liquid is saturated sodium carbonate, the mixture is uniformly mixed, the mixture is kept stand for 3 to 5 minutes, the ethyl acetate is obtained through separation, and the recovery rate of the ethyl acetate reaches 97 percent through the recovery amount measurement. The aqueous sodium carbonate ethoxide solution was discharged from the drain port 503, and ethanol and the aqueous sodium carbonate solution were separated by distillation under reduced pressure, whereby the recovery rate of ethanol was 98.2%.

The waste agricultural floating disc treatment device can complete the cutting and dissolving of the waste floating disc or the polystyrene foam board under the completely closed condition, is safe and clean, does not generate dust and toxic gas when the waste floating disc or the polystyrene foam board is treated, and only needs to treat the floating disc cleanly in advance. The polystyrene obtained by precipitation after dissolution has a volume of only 1/40 of that of the polystyrene foam.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The foregoing is merely a preferred embodiment of the present invention, and it should be noted that the above-mentioned preferred embodiment should not be construed as limiting the invention, and the scope of the invention should be defined by the appended claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.

Claims (10)

1. The waste foam polystyrene recovery device is characterized by comprising a floating disc treatment device, a precipitation tank and an extraction tank;

the float plate processing device comprises:

a float tray support for supporting a float tray;

a second box for holding ethyl acetate;

the solvent cutting device is used for cutting the floating disc and comprises a high-pressure spray head for spraying the solvent, and the high-pressure spray head is arranged in the first box body and is used for cutting the floating disc into thin slices with the thickness of 0.1-2 mm; the solvent is ethyl acetate;

a first tank for receiving the divided float sheet and solvent;

the first box passes through the pipeline connection precipitation tank, the precipitation tank passes through the pipeline connection extraction tank, the extraction tank passes through the pipeline connection second box.

2. The waste foamed polystyrene recovery device of claim 1, further comprising a spray device for spraying the solvent to a waste agricultural drift plate.

3. The waste foamed polystyrene recycling device according to claim 1 or 2, wherein the first box body and the second box body are integrally arranged, and the first box body is communicated with the second box body through a filter screen, a filter membrane or a filter plate.

4. The waste foamed polystyrene recycling device according to claim 1 or 2, wherein the solvent cutting device comprises a first liquid inlet pipe, a first pump, a first liquid outlet pipe and a high-pressure spray head which are connected in sequence; the free end of the first liquid inlet pipe is positioned in the second box body.

5. The waste foamed polystyrene recycling device according to claim 2, wherein the spraying device comprises a second liquid inlet pipe, a second pump and a second liquid outlet pipe which are sequentially connected, and the free end of the second liquid inlet pipe is positioned in the second box body.

6. The apparatus for recycling waste styrofoam according to claim 1 or 2, further comprising a heating means for heating the solvent.

7. The waste foamed polystyrene recycling device according to claim 1, wherein a tray inlet is formed in the first box body, and a tray inlet rail is arranged on the tray inlet; the floating disc support comprises a disc feeding rail, a clamping groove is formed in the disc feeding rail, one end of the disc feeding rail is arranged outside the first box body, and the other end of the disc feeding rail is arranged in the first box body; the high-pressure spray head is positioned right above the tail end of the disc feeding rail; a reflow hole is arranged in the first box body of the tray inlet rail near the tray inlet end; the high-pressure spray head is a rotary spray head or a sliding spray head.

8. The waste foamed polystyrene recycling device according to claim 1, wherein a ceramic filter core plate is horizontally arranged in the tank body of the precipitation tank, a precipitation tank is arranged above the ceramic filter core plate, and a suction filtration tank is arranged below the ceramic filter core plate; the precipitation tank is provided with a dissolving liquid inlet and an ethanol adding port, and the suction filtration tank is provided with a precipitation outlet and a suction filtration port; a scraper is arranged on the ceramic filter core plate; the dissolving liquid inlet of the precipitation tank is communicated with the first tank body through a pipeline; and a suction port of the suction box is communicated with the extraction tank through a pipeline.

9. The apparatus according to claim 8, wherein the extraction tank is provided with a mixed liquor inlet, an extract liquor addition port, a liquid discharge port and a recovery port; the mixed liquid inlet is communicated with the suction filtration port through a pipeline; the recycling port is communicated with the second box body through a pipeline.

10. A method for recycling waste foamed polystyrene based on the device of any one of claims 1 to 9, characterized by comprising the following steps:

s1: the waste polyethylene foam is cleaned up and the waste polyethylene foam is removed,

s2: cutting the polystyrene foam using a high pressure ethyl acetate stream;

s3: dissolving polystyrene foam by using ethyl acetate to obtain a dissolving solution; the dissolution temperature is set to be 45-50 ℃;

s4: adding ethanol into the dissolution solution to obtain polystyrene precipitate, and carrying out solid-liquid separation to obtain polystyrene and a mixed solution of ethyl acetate and ethanol;

s5: adding saturated sodium carbonate into the mixed solution of ethyl acetate and ethanol for extraction, and separating to obtain ethyl acetate and ethanol sodium carbonate aqueous solution;

s6: the ethyl acetate obtained in step 5 was recycled for cutting and dissolving polystyrene foam.