CN112476849B - Multistage salt washing system for regenerating plastic particles - Google Patents
Multistage salt washing system for regenerating plastic particles Download PDFInfo
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- CN112476849B CN112476849B CN202011238420.5A CN202011238420A CN112476849B CN 112476849 B CN112476849 B CN 112476849B CN 202011238420 A CN202011238420 A CN 202011238420A CN 112476849 B CN112476849 B CN 112476849B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
- B01J19/1862—Stationary reactors having moving elements inside placed in series
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/04—Disintegrating plastics, e.g. by milling
- B29B17/0412—Disintegrating plastics, e.g. by milling to large particles, e.g. beads, granules, flakes, slices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B2017/001—Pretreating the materials before recovery
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
- B29B2017/0203—Separating plastics from plastics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
- B29B2017/0213—Specific separating techniques
- B29B2017/0217—Mechanical separating techniques; devices therefor
- B29B2017/0237—Mechanical separating techniques; devices therefor using density difference
- B29B2017/0244—Mechanical separating techniques; devices therefor using density difference in liquids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
The invention discloses a multistage brine wash system for regenerating plastic particles, which comprises a heavy brine wash tank, a first light brine wash tank and a second light brine wash tank; the heavy brine washing tank is an upper brine washing tank and comprises a tank body, a stirring device and a detachable filtering cage are arranged in the tank body, the filtering cage is an annular filtering cage which is arranged at the outer side of the tank body corresponding to the stirring device, filtering holes for distinguishing the particle sizes of plastic particles subjected to brine washing in the heavy brine washing tank are formed in the side wall and the top surface of the filtering cage, and the bottom surface of the filtering cage is a closed inclined surface; the discharge port of the heavy brine washing tank is sequentially connected with a solid-liquid separation device and plastic crushing equipment, and the rear part of the plastic crushing equipment is connected with a first light brine washing tank; and a bracket matched with the filter cage is arranged in the second light brine washing tank. The invention can effectively improve the recovery rate of the small-particle-size recovered plastic particles in the salt washing process, reduce loss and improve the overall recovery rate of the plastic particles.
Description
Technical Field
The invention relates to related equipment in a plastic recycling technology, in particular to a multistage salt washing system for regenerating plastic particles.
Background
The plastic has the advantages of convenience, availability, wide application, low cost and the like, and with the development of the plastic industry, the plastic with different properties is widely applied to various fields as an important raw material; however, various plastic products bring great convenience to the production and living of human beings, but at the same time, a large amount of plastic wastes are generated, and the waste plastic contains high-end plastics and a large amount of production raw materials of common plastics, so that the waste plastic has great potential economic value, and also forms an environmental problem, so that the plastic products are usually recycled and reprocessed in order to realize the recycling of resources and relieve the environmental pressure.
The recovery process of the old plastic mainly comprises four steps of cleaning, crushing, granulating and reprocessing and utilizing, but as a plurality of plastic products are adhered with adhesive layers, the adhesive layers comprise a paint layer and an ink layer, and meanwhile, the adhesive layers also comprise structural layers with complex components such as a metal foil layer, an adhesive layer and a protective film layer, the components of the adhesive layers are mainly animal and vegetable oil, mineral oil stains, printing ink, chemical residues and sizing materials, and the adhesive layers are relatively complex; therefore, before granulation, the adhesion layer needs to be removed for recycling, otherwise, the straightness of the finished regenerated plastic product can be reduced, the added value of the product is low, and the development of the waste plastic recycling industry is not facilitated.
The common cleaning method used for recycling the old plastics is salt washing, namely, the cleaning salt reagent is used for removing the adhesive layer, the cleaning salt reagent is various in types, and the adhesive layer is removed by chemical reaction between the cleaning salt reagent and the adhesive layer or dissolution of the adhesive layer, so that the cleaning salt reagent can be selected according to different types of waste plastics. In order to ensure the salt washing efficiency and quality, the salt washing process is mainly carried out after the crushing process, when the crushed recovered plastic particles are subjected to salt washing, but when the small-particle recovered plastic particles are subjected to salt washing, the salt washing agent has certain corrosiveness to the plastic base material, and the recovered plastic particles can be damaged even due to denaturation caused by long-time salt washing, so that the salt washing time and the salt washing concentration are required to be strictly controlled, and the salt washing agent is ensured to be fully contacted with the recovered plastic particles, so that the corrosiveness of the salt washing agent to the plastic base material is avoided, but the conventional salt washing structure is too simple, and the effect and quality of the recovered plastic particles and the salt washing are directly influenced.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a multistage salt washing system for regenerating plastic particles, so as to solve the drawbacks in the background art.
The technical problems solved by the invention are realized by adopting the following technical scheme:
a multistage brine wash system for regenerating plastic particles, comprising three brine wash tanks including as heavy brine wash tanks, a first light brine wash tank, and a second light brine wash tank;
the heavy brine washing tank is an upper-level brine washing tank and comprises a tank body, a feeding port and a discharging port are respectively arranged on the tank body, the feeding port is arranged at the top of the tank body, and the discharging port is arranged at the bottom of the tank body; the tank body is provided with a hollow cavity, a stirring device is arranged in the hollow cavity, the upper part of the stirring device extends out of the tank body, and the tank body is connected with a stirring motor; the middle position of the heavy brine washing tank is provided with a detachable filtering cage, the filtering cage is an annular filtering cage, the filtering cage is arranged on the outer side of the tank body corresponding to the stirring device, the side wall and the top surface of the filtering cage are provided with filtering holes for distinguishing the particle sizes of plastic particles washed by brine in the heavy brine washing tank, and the bottom surface of the filtering cage is a closed inclined surface;
the discharge port of the heavy brine washing tank is sequentially connected with a solid-liquid separation device and plastic crushing equipment, the rear part of the plastic crushing equipment is connected with a first light brine washing tank, and secondary brine washing is performed through the first light brine washing tank;
the second light brine washing tank is internally provided with a bracket matched with the filter cage, the filter cage is directly assembled on the bracket after being taken out from the heavy brine washing tank, and secondary brine washing is carried out through the second light brine washing tank.
As a further limitation, the upper part of the heavy brine washing tank is provided with an opening, the opening is closed by a sealing cover, and the sealing cover is provided with a feeding port and a heavy brine supplementing port.
As a further limitation, the first and second light brine wash tanks are each provided with a stirring device therein.
As a further limitation, the material transportation device is arranged between the heavy brine wash tank and the solid-liquid separation device and between the plastic crushing equipment and the first light brine wash tank through a packing auger.
As a further limitation, brine concentration sensors are provided in each of the heavy brine wash tank, the first light brine wash tank, and the second light brine wash tank to monitor brine concentrations in the heavy brine wash tank and the light brine wash tank in real time.
By further limiting, transparent observation windows are arranged on the side walls of the heavy brine wash tank, the first light brine wash tank and the second light brine wash tank, so that the reaction state condition of materials in the brine wash tank can be observed conveniently.
The beneficial effects are that: the multistage salt washing system for regenerating plastic particles has simple structure and reasonable design, the recycled plastic particles subjected to heavy salt washing in the heavy salt washing tank are classified according to particle size by utilizing the filter cage, large-particle plastic is directly discharged from a discharge port of the heavy salt washing tank and enters a light salt washing stage after solid-liquid separation and crushing equipment, and the recycled plastic particles with small particle size which are directly screened in the heavy salt washing tank are directly pumped out in the filter cage and are filled into a second light salt washing tank together with the filter cage after being filtered out; therefore, the recycled plastic particles can be subjected to corresponding salt washing treatment according to specific particle size, the problem that the small-particle-size recycled plastic particles are damaged in the salt washing process is avoided, the utilization rate of raw materials is improved, the waste of the raw materials is reduced, and the salt washing efficiency and the salt washing effect of the recycled plastic particles are improved.
Drawings
FIG. 1 is a schematic diagram of a preferred embodiment of the present invention.
In the figure: 1. a heavy salt water washing tank; 2. a second light brine wash tank; 3. a first light brine wash tank; 4. a stirring motor; 5. a first feed port; 6. sealing cover; 7. a heavy brine circulating reflux pipeline; 8. a heavy brine supplementing port; 9. a first stirring device; 10. a first filter cage; 11. a second filter cage; 12. a discharge port; 13. a pump; 14. a first auger; 15. a solid-liquid separation device; 16. a second auger; 17. a plastic crushing device; 18. a third auger; 19. a second stirring device; 20. a third stirring device; 21. a bracket; 22. a second feed port; 23. and a third feeding port.
Description of the embodiments
The invention is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the implementation of the invention easy to understand.
Referring to a preferred embodiment of a multistage brine wash system for regenerating plastic particles of fig. 1, in this embodiment, the multistage brine wash system comprises a heavy brine wash tank 1, a first light brine wash tank 3, and a second light brine wash tank 2. Wherein, heavy brine wash tank 1 includes the jar body, its jar body upper portion opening and pass through sealed lid 6 in the open position, be provided with heavy brine on the sealed lid 6 and supply mouthful 8 and first feed inlet 5, and still be provided with first agitating unit 9 in the jar body of heavy brine wash tank 1, this first agitating unit 9 includes two stirring paddles, and connect stirring shaft upper portion of stirring paddle and fix on sealed lid 6, and link to each other with agitator motor 4 at sealed lid 6 upper portion, first agitating unit 9 drives through agitator motor 4, thereby stir the material in heavy brine wash tank 1 and improve the salt washing effect in the heavy brine wash tank 1.
The heavy brine wash tank 1 is respectively provided with a first filter cage 10 and a second filter cage 11 corresponding to the space between the two stirring paddles and the lower part of the lower stirring paddle, and the first filter cage 10 and the second filter cage 11 are fixed on the side wall of the heavy brine wash tank 1 through hanging frames. The first filter cage 10 and the second filter cage 11 have the same structure and are both filter cages with annular structures, and filter screens of the filter cages are arranged on the side wall and the top surface of the filter cage 10 and are used for carrying out differential screening on large particles and small particles on the particle sizes of plastic particles washed by salt in a heavy brine washing tank; and closed inclined surfaces are provided on the lower surfaces of the first and second filter cages 10 and 11.
The bottom of the heavy brine washing tank 1 is provided with a discharge hole 12, the discharge hole 12 is connected with a solid-liquid separation device 15 through a first auger 14, the liquid outlet end of the solid-liquid separation device 15 is connected with a heavy brine supplementing hole 8 on the heavy brine washing tank 1 through a heavy brine circulating reflux pipeline 7, the solid outlet of the solid-liquid separation device 15 is connected with a feed inlet of a plastic crushing device 17 through a second auger 16, and the discharge hole of the plastic crushing device 17 is connected with a corresponding second feed inlet 22 on the first light brine washing tank 3 through a third auger 18. The second light brine washing tank 2 is independently arranged beside the heavy brine washing tank 1, a third feeding port 23 is arranged at the upper part of the second light brine washing tank 2, and a bracket 21 capable of assembling and fixing the first filter cage 10 or the second filter cage 11 is arranged in the second light brine washing tank 2; the second and first brine tanks 2 and 3 are further provided with a second stirring device 19 and a third stirring device 20, respectively, to which an independent driving motor is connected.
When the method is used, firstly, the recovered old plastic particles subjected to preliminary crushing are put into the heavy brine washing tank 1 from the first feed port 5, the heavy brine is added into the corresponding heavy brine agent through the heavy brine supplementing port to carry out heavy brine washing, the stirring operation is carried out through the first stirring device 9 in the washing process to promote the reaction, in the reaction process, the small particles in the recovered old plastic particles move in the heavy brine washing tank 1 through the stirring of the first stirring device 9, enter the filter cage through the side walls of the first filter cage 10 and the second filter cage 11 and the filter holes on the upper surface filter screen, and settle at the closed inclined plane position of the filter cage, so that the disturbance influence of the small-particle old plastic at the settling position of the first stirring device 9 is reduced and cannot return to the tank body space of the heavy brine washing tank 1 again, meanwhile, the contact surface between the small-particle old plastic settled at the closed inclined plane position and the heavy brine is less, the reaction is slow, and the influence of the heavy brine agent on the corrosion of the base material of the small-particle old plastic can be reduced; and the large-particle old plastic is not carried into the filter cage, so that the heavy brine is continuously and rapidly reacted with the heavy brine reagent in the heavy brine washing tank 1 outside the filter cage through the stirring of the first stirring device 9, and the heavy brine washing operation is completed.
After the heavy brine washing operation in the heavy brine washing tank 1 is finished, the discharge opening 12 is opened, then the large-particle old plastic and the heavy brine reagent are sent into the solid-liquid separation device 15 through the first auger 14 for separation, the liquid part of the large-particle old plastic and the heavy brine reagent are returned to the heavy brine washing tank 1 again through the heavy brine supplementing opening 8 through the combination of the pump 13 and the heavy brine circulating reflux pipeline 7, and the concentration of the heavy brine reagent can be adjusted in a mode of properly adjusting and supplementing the heavy brine reagent stock solution, so that the waste of the heavy brine reagent is reduced. And the large-particle old plastic at the solid outlet of the solid-liquid separation device 15 is lifted into the plastic crushing equipment 17 through the second auger 16, and enters the first light brine wash tank 3 after being crushed for the second time through the plastic crushing equipment 17, the light brine reagent is added into the first light brine wash tank 3 according to the operation specification of light brine wash, the light brine wash operation is carried out, and the second stirring device 19 is used for stirring to assist in improving the reaction rate in the operation process.
After the large-particle old plastic and the heavy-salt reagent in the heavy-salt water washing tank 1 are emptied, the sealing cover 6 is opened, the first filtering cage 10 and the second filtering cage 11 are taken down from the corresponding hanging frames and are sequentially installed on the support 21 in the second light-salt water washing tank 2 to carry out light-salt water washing operation, the light-salt reagent is added according to the operation specification of light-salt water washing during the light-salt water washing operation, the first filtering cage 10 or the second filtering cage 11 is reversely fixed on the support 21, namely, the corresponding sealing inclined plane of the first filtering cage 10 or the second filtering cage 11 faces upwards, so that the corresponding small-particle old plastic in the first filtering cage 10 or the second filtering cage 11 falls into the tank body of the second light-salt water washing tank 2, and the reaction is assisted by the third stirring device 20.
After the light brine washing operation in the second light brine washing tank 2 and/or the first light brine washing tank 3 is finished, the corresponding second stirring device 19 and the third stirring device 20 are closed, and then the discharging operation after the light brine washing is finished can be carried out by opening the corresponding discharging holes on the second light brine washing tank 2 and/or the first light brine washing tank 3, so that the small-particle regenerated plastic raw material which is subjected to the heavy brine washing and the light brine washing in sequence is obtained.
In the present embodiment, in order to improve the convenience of use of the heavy brine wash tank 1, the first light brine wash tank 2, and the second light brine wash tank 3, brine concentration sensors are provided in each of the heavy brine wash tank 1, the first light brine wash tank 2, and the second light brine wash tank 3 to monitor brine concentrations in the heavy brine wash tank and the light brine wash tank in real time; and transparent observation windows are also arranged on the side walls of the heavy brine wash tank 1, the first light brine wash tank 2 and the second light brine wash tank 3 corresponding to the tank bodies, so that the reaction state conditions of materials in the brine wash tanks can be observed conveniently.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A multistage brine wash system for regenerating plastic particles, comprising three brine wash tanks including a first light brine wash tank and a second light brine wash tank as heavy brine wash tanks;
the heavy brine washing tank is an upper-level brine washing tank and comprises a tank body, a feeding port and a discharging port are respectively arranged on the tank body, the feeding port is arranged at the top of the tank body, and the discharging port is arranged at the bottom of the tank body; the tank body is provided with a hollow cavity, a stirring device is arranged in the hollow cavity, the upper part of the stirring device extends out of the tank body, and the tank body is connected with a stirring motor; the middle position of the heavy brine washing tank is provided with a detachable filtering cage, the filtering cage is an annular filtering cage, the filtering cage is arranged on the outer side of the tank body corresponding to the stirring device, the side wall and the top surface of the filtering cage are provided with filtering holes for distinguishing the particle sizes of plastic particles washed by brine in the heavy brine washing tank, and the bottom surface of the filtering cage is a closed inclined surface;
the discharge port of the heavy brine washing tank is sequentially connected with a solid-liquid separation device and plastic crushing equipment, the rear part of the plastic crushing equipment is connected with a first light brine washing tank, and secondary brine washing is performed through the first light brine washing tank;
the second light brine washing tank is internally provided with a bracket matched with the filter cage, the filter cage is directly assembled on the bracket after being taken out from the heavy brine washing tank, and secondary brine washing is carried out through the second light brine washing tank.
2. The multistage brine wash system for regenerating plastic granules according to claim 1, wherein the heavy brine wash tank is provided with an opening at an upper portion thereof and is closed at an opening position by a sealing cap provided with a feed port and a heavy brine replenishment port.
3. The multistage brine wash system for regenerating plastic granules according to claim 1, wherein stirring means are provided in both the first and second light brine wash tanks.
4. The multistage brine wash system for regenerating plastic granules according to claim 1, wherein a material transporting means is provided between the heavy brine wash tank and the solid-liquid separation means, and between the plastic crushing apparatus and the first light brine wash tank.
5. The multistage brine wash system for regenerating plastic granules according to claim 1, wherein brine concentration sensors are provided in each of the heavy brine wash tank, the first light brine wash tank, and the second light brine wash tank.
6. The multistage brine wash system for regenerating plastic particles of claim 1, wherein transparent viewing windows are provided on sidewalls of each of the heavy brine wash tank, the first light brine wash tank, and the second light brine wash tank.
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| CN202011238420.5A CN112476849B (en) | 2020-11-09 | 2020-11-09 | Multistage salt washing system for regenerating plastic particles |
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| CN202011238420.5A CN112476849B (en) | 2020-11-09 | 2020-11-09 | Multistage salt washing system for regenerating plastic particles |
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| CN112476849B true CN112476849B (en) | 2023-06-02 |
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