System for preparing recycled plastic particles by sorting stale garbage

Abstract

The utility model relates to a system for preparing and recycling plastic particles by sorting stale garbage, which comprises a feeding unit, a screening unit, a crushing unit, a humus recycling unit, a small aggregate recycling unit, a large aggregate recycling unit and a plastic particle preparation unit. And efficient recycling of light materials is achieved, and the purposes of resource recycling and environment protection are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sorting and treating stale waste, and particularly relates to a system for sorting stale waste to prepare and recycle plastic particles. Background Art

[0002] The waste formed by the stockpiled waste in the landfill after a certain period of stacking and decomposition is called stale waste. At present, the treatment process of stale waste in landfills is changing to "screening + resource utilization". Screening is an important process method to realize the reduction, resource utilization and harmless treatment of stale waste. The waste is sorted according to the utilization categories of materials, and then the sorted different materials are used for resource utilization. The screening products are mainly divided into three categories: inorganic aggregates, humus soil and light substances. Among them, the main disposal method of light substances is to send them to an incineration power plant for incineration and power generation. The humus soil can be reused, and the inorganic aggregates can be reused through the resource utilization of construction waste. However, the direct incineration treatment of light substances has a low resource utilization rate, and at the same time, the incineration treatment causes secondary pollution to the surrounding environment. Content of the Utility Model

[0003] In view of various deficiencies of the prior art, a system for sorting stale waste to prepare and recycle plastic particles is proposed to solve the problem of the disposal of light substances in the sorting of stale waste, realize the efficient recovery of light substances, and achieve the purpose of resource recycling and environmental protection.

[0004] To achieve the above object, the utility model provides the following technical solutions:

[0005] A system for sorting stale waste to prepare and recycle plastic particles includes a feeding unit, a screening unit, a crushing unit, a humus soil recovery unit, a small aggregate recovery unit, a large aggregate recovery unit and a plastic particle preparation unit. The screening unit includes a primary screening element and a secondary screening element. The crushing unit includes a first crushing element and a second crushing element;

[0006] The undersize outlet of the primary screening element is connected to the inlet of the secondary screening element. The undersize outlet of the secondary screening element is respectively connected to the inlet of the humus soil recovery unit and the inlet of the second crushing element. The oversize outlet of the secondary screening element is respectively connected to the inlet of the small aggregate recovery unit and the inlet of the second crushing element. The oversize outlet of the primary screening element is connected to the inlet of the first crushing element. The outlet of the first crushing element is respectively connected to the inlet of the large aggregate recovery unit and the inlet of the second crushing element. The outlet of the second crushing element is connected to the inlet of the plastic particle preparation unit.

[0007] This technical solution is further configured such that a first air separation element is provided at the outlet of the first crushing element, and the outlets of the first air separation element are respectively connected to the inlet of the large aggregate recovery unit and the inlet of the second crushing element.

[0008] This technical solution is further configured such that the large aggregate recovery unit includes a first magnetic separator and a first eddy current separator connected in sequence. The inlet of the first magnetic separator is connected to the outlet of the first air separation element, and a first manual sorting table is provided at the outlet of the first eddy current separator.

[0009] This technical solution is further configured such that the under-screen material outlet of the secondary screening element is connected to the inlet of the second air separation element, and the outlets of the second air separation element are respectively connected to the inlet of the humus soil recovery unit and the inlet of the second crushing element.

[0010] This technical solution is further configured such that the humus soil recovery unit includes a second magnetic separator and a second eddy current separator connected in sequence. The inlet of the second magnetic separator is connected to the outlet of the second air separation element.

[0011] This technical solution is further configured such that the over-screen material outlet of the secondary screening element is connected to the inlet of the third air separation element, and the outlets of the third air separation element are respectively connected to the inlet of the small aggregate recovery unit and the inlet of the second crushing element.

[0012] This technical solution is further configured such that the small aggregate recovery unit includes a third magnetic separator and a third eddy current separator connected in sequence. The inlet of the third magnetic separator is connected to the outlet of the third air separation element.

[0013] This technical solution is further configured such that the plastic particle preparation unit includes a relaxation screen, a water washing assembly, and a drying and granulating assembly connected in sequence, and a vibration separator is provided at the outlet of the drying and granulating assembly.

[0014] This technical solution is further configured such that the water washing assembly includes a spiral water washer and a flotation machine connected in sequence, and the water inlet, water outlet of the spiral water washer and the water inlet, water outlet of the flotation machine are all connected to the sedimentation tank.

[0015] This technical solution is further configured such that a plurality of spiral water washers are arranged, and the plurality of spiral water washers are connected in sequence.

[0016] The beneficial effects of the present utility model are:

[0017] By sorting the stale garbage, humus soil, small pieces of aggregate, large pieces of aggregate and light materials therein are recovered for secondary utilization. The sorted light materials can be made into recycled plastic particles to become high-value commodities, thus solving the problem of disposing of the light materials separated from the stale garbage, realizing the efficient recovery of the light materials, and achieving the purpose of resource recycling and environmental protection. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the system for sorting stale garbage to prepare recycled plastic particles in the embodiment of the present utility model.

[0019] In the drawings: 1. Feeding machine; 2. Material leveling device; 3. First screening element; 4. First crushing element; 5. First air separation element; 6. First magnetic separator; 7. First eddy current separator; 8. Second crushing element; 9. Relaxation screen; 10. Second screening element; 11. Second air separation element; 12. Second magnetic separator; 13. Second eddy current separator; 14. Third air separation element; 15. Third magnetic separator; 16. Third eddy current separator; 17. Screw washing machine; 18. Flotation machine; 19. Sedimentation tank; 20. Screw dryer; 21. First dryer; 22. Second dryer; 23. Granulating machine; 24. Vibration separator; 25. First manual sorting table; 26. Second manual sorting table; 27. Mixing machine. Detailed Embodiments

[0020] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the drawings of the present utility model. Based on the embodiments in this application, other similar embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application. In addition, the directional terms mentioned in the following embodiments, such as "upper", "lower", "left", "right", etc., are only references to the directions of the drawings. Therefore, the directional terms used are for illustration rather than to limit the present invention.

[0021] The present utility model will be further described below in conjunction with the drawings and preferred embodiments.

[0022] According to an embodiment of the present utility model, a system for sorting stale garbage to prepare recycled plastic particles is provided. Please refer to Figure 1 , which includes a feeding unit, a screening unit, a crushing unit, a humus soil recovery unit, a small piece of aggregate recovery unit, a large piece of aggregate recovery unit and a plastic particle preparation unit. The screening unit includes a first screening element 3 and a second screening element 10, and the crushing unit includes a first crushing element 4 and a second crushing element 8;

[0023] The undersize outlet of the primary screening element 3 is connected to the inlet of the secondary screening element 10. The undersize outlet of the secondary screening element 10 is respectively connected to the inlet of the humus soil recovery unit and the inlet of the second crushing element 8. The oversize outlet of the secondary screening element 10 is respectively connected to the inlet of the small aggregate recovery unit and the inlet of the second crushing element 8. The oversize outlet of the primary screening element 3 is connected to the inlet of the first crushing element 4. The outlet of the first crushing element 4 is respectively connected to the inlet of the large aggregate recovery unit and the inlet of the second crushing element 8. The outlet of the second crushing element 8 is connected to the inlet of the plastic pellet preparation unit.

[0024] It should be noted that by sorting the stale garbage, humus soil, small aggregates, large aggregates and light materials therein are recovered for secondary utilization. Moreover, the sorted light materials can be made into recycled plastic pellets to become high-value commodities, thus solving the problem of disposing of the light materials separated from the stale garbage, realizing the efficient recovery of the light materials, and achieving the purpose of resource recycling and environmental protection.

[0025] Specifically, the feeding unit includes a feeder 1 and a material leveling device 2. The stale garbage is fed by the feeder 1 and thinned by the material leveling device 2 to enable the screening unit to feed evenly and continuously. Meanwhile, a second manual sorting table 26 is arranged between the material leveling device 2 and the screening unit to manually pick out large objects with a particle size greater than 200 mm. The large objects enter the first crushing element 4 for coarse crushing, and the materials from which the large objects are picked out enter the primary screening element 3 for coarse screening.

[0026] Preferably, the feeder 1 adopts a step feeder, the primary screening element 3 adopts a drum screen, the secondary screening element 10 adopts a star plate screen, the first crushing element 4 adopts a coarse crusher, and the second crushing element 8 adopts a fine crusher.

[0027] Specifically, an aerobic aeration device is used to pretreat the garbage heap. Through the processes of injecting gas into and extracting gas from the heap, the oxygen content in the garbage heap is increased to accelerate the degradation of the heap. And through exhaust gas extraction, the water vapor and harmful gases in the heap are extracted and discharged after being treated by the odor treatment system for organized emission. The pretreated stale garbage is excavated, transported to the screening site by vehicle, and then enters the feeding unit.

[0028] In the stale garbage sorting and recycling plastic pellet preparation system of this embodiment, please refer to Figure 1 , a first air separation element 5 is arranged at the outlet of the first crushing element 4. The outlet of the first air separation element 5 is respectively connected to the inlet of the large aggregate recovery unit and the inlet of the second crushing element 8.

[0029] It should be noted that the oversize material of the primary screening element 3 enters the first crushing element 4 for coarse crushing until the particle size is less than 150 mm, reducing the particle size of the material. The material after coarse crushing enters the first air separation element 5 to separate the large aggregates from the light materials. The large aggregates enter the large aggregate recovery unit, and the light materials enter the second crushing element 8 for fine crushing. Among them, the first air separation element 5 is preferably an inclined air separator.

[0030] In the system for sorting and preparing recycled plastic particles from stale garbage of this embodiment, please refer to Figure 1 , the large aggregate recovery unit includes a first magnetic separator 6 and a first eddy current separator 7 connected in sequence. The inlet of the first magnetic separator 6 is connected to the outlet of the first air separation element 5, and a first manual sorting table 25 is arranged at the outlet of the first eddy current separator 7.

[0031] It should be noted that through the first magnetic separator 6 and the first eddy current separator 7, ferromagnetic substances and non-ferrous metals in the separated large aggregates are sorted. The remaining large aggregates after sorting pass through the first manual sorting table 25 to manually pick out the plastics mixed in the large aggregates to obtain pure large aggregates. The light materials picked out enter the second crushing element 8 for fine crushing.

[0032] In the system for sorting and preparing recycled plastic particles from stale garbage of this embodiment, please refer to Figure 1 , the undersize outlet of the secondary screening element 10 is connected to the inlet of the second air separation element 11, and the outlet of the second air separation element 11 is respectively connected to the inlet of the humus soil recovery unit and the inlet of the second crushing element 8.

[0033] It should be noted that the undersize material of the primary screening element 3 enters the secondary screening element 10. The undersize material of the secondary screening element 10 is humus soil, and the oversize material is small aggregates and small light materials. The humus soil contains small plastic blocks. The second air separation element 11 is used to sort the undersize material of the fine star screen to separate relatively pure humus soil and small light materials. The humus soil enters the humus soil recovery unit, and the small light materials enter the second crushing element 8 for fine crushing. The second air separation element 11 is preferably a cyclone air separator.

[0034] In the system for sorting and preparing recycled plastic particles from stale garbage of this embodiment, please refer to Figure 1 , the humus soil recovery unit includes a second magnetic separator 12 and a second eddy current separator 13 connected in sequence. The inlet of the second magnetic separator 12 is connected to the outlet of the second air separation element 11.

[0035] It should be noted that the relatively pure humus soil separated by the second air separation element 11 is separated from ferromagnetic substances and non-ferrous metals through the second magnetic separator 12 and the second eddy current separator 13 to obtain pure humus soil.

[0036] In the system for sorting and preparing recycled plastic particles from old waste in this embodiment, please refer to Figure 1 , the oversize outlet of the secondary screening element 10 is connected to the inlet of the third air separation element 14, and the outlet of the third air separation element 14 is respectively connected to the inlet of the small aggregate recovery unit and the inlet of the second crushing element 8.

[0037] It should be noted that the oversize of the secondary screening element 10 enters the third air separation element 14 for sorting, and relatively pure small aggregates and small light substances are separated. The small light substances enter the second crushing element 8 for fine crushing, and the relatively pure small aggregates enter the small aggregate recovery unit.

[0038] In the system for sorting and preparing recycled plastic particles from old waste in this embodiment, please refer to Figure 1 , the small aggregate recovery unit includes a third magnetic separator 15 and a third eddy current separator 16 connected in sequence, and the inlet of the third magnetic separator 15 is connected to the outlet of the third air separation element 14.

[0039] It should be noted that the relatively pure small aggregates are separated from ferromagnetic substances and non-ferrous metals through the third magnetic separator 15 and the third eddy current separator 16 to obtain pure small aggregates. The third air separation element 14 is preferably a cyclone air separator.

[0040] In the system for sorting and preparing recycled plastic particles from old waste in this embodiment, please refer to Figure 1 , the plastic particle preparation unit includes a relaxation screen 9, a water washing assembly, and a drying and granulating assembly connected in sequence, and a vibration separator 24 is arranged at the outlet of the drying and granulating assembly.

[0041] It should be noted that the plastic crushed by the second crushing element 8 is sent to the relaxation screen 9 to screen out impurities in the plastic to obtain relatively pure light substances. The relatively pure light substances obtained through the relaxation screen 9 pass through the water washing assembly, and the heavier substances in the light substances are separated as precipitates, and the floating ones are pure light substances.

[0042] Specifically, the drying and granulating assembly includes a spiral dryer 20, a first dryer 21, a mixer 27, a second dryer 22, and a granulator 23. The pure light substances first enter the spiral dryer 20 for preliminary drying to reduce the moisture content of the materials, and then enter the first dryer 21 for heat drying. The dried materials enter the mixer 27, where stabilizers, flame retardants, colorants, etc. are added for mixing. The mixed materials enter the second dryer 22 for drying again to make the moisture content of the materials lower than 1%. The dried materials enter the granulator 23 for processes such as melting, extrusion, granulation, and cutting. The cut recycled plastic particles are transported to the vibrating separator 24 for grading by size to improve the consistency and stability of plastic products, and finally qualified recycled plastic particles are obtained.

[0043] In the system for sorting and preparing recycled plastic particles from aged garbage in this embodiment, please refer to Figure 1 , the water washing assembly includes a spiral water washer 17 and a flotation machine 18 connected in sequence. The water inlet, water outlet of the spiral water washer 17, and the water inlet, water outlet of the flotation machine 18 are all connected to the sedimentation tank 19.

[0044] It should be noted that the wastewater after the spiral water washer 17 and the flotation machine 18 flows into the sedimentation tank 19. After sedimentation treatment, the clear water is used for the spiral water washer 17 and the flotation machine 18.

[0045] In the system for sorting and preparing recycled plastic particles from aged garbage in this embodiment, please refer to Figure 1 , a plurality of spiral water washers 17 are arranged, and the plurality of spiral water washers 17 are connected in sequence.

[0046] In this embodiment, there are 2 spiral water washers 17, namely the first spiral water washer and the second spiral water washer. After passing through the first spiral water washer, the second spiral water washer, and the flotation machine 18, pure light substances are obtained.

[0047] The above has made a detailed description of the present utility model. The above is only the preferred embodiment of the present utility model, and it cannot limit the scope of implementation of the present utility model. That is, all equal changes and modifications made according to the scope of this application should still fall within the scope covered by the present utility model.

Claims

1. A system for sorting and preparing recycled plastic particles from stale garbage, characterized in that, It includes a feeding unit, a screening unit, a crushing unit, a humus soil recovery unit, a small aggregate recovery unit, a large aggregate recovery unit and a plastic pellet preparation unit. The screening unit includes a primary screening element and a secondary screening element. The crushing unit includes a first crushing element and a second crushing element; The under-screen material outlet of the primary screening element is connected to the inlet of the secondary screening element. The under-screen material outlet of the secondary screening element is respectively connected to the inlet of the humus soil recovery unit and the inlet of the second crushing element. The over-screen material outlet of the secondary screening element is respectively connected to the inlet of the small aggregate recovery unit and the inlet of the second crushing element. The over-screen material outlet of the primary screening element is connected to the inlet of the first crushing element. The outlet of the first crushing element is respectively connected to the inlet of the large aggregate recovery unit and the inlet of the second crushing element. The outlet of the second crushing element is connected to the inlet of the plastic pellet preparation unit.

2. The stale waste sorting and recycling plastic particle preparation system according to claim 1, characterized in that, A first air separation element is arranged at the outlet of the first crushing element. The outlet of the first air separation element is respectively connected to the inlet of the large aggregate recovery unit and the inlet of the second crushing element.

3. The stale waste sorting and recycling plastic pellet preparation system according to claim 2, characterized in that, The large aggregate recovery unit includes a first magnetic separator and a first eddy current separator connected in sequence. The inlet of the first magnetic separator is connected to the outlet of the first air separation element. A first manual sorting table is arranged at the outlet of the first eddy current separator.

4. The stale waste sorting and recycling plastic pellet preparation system according to claim 1, characterized in that, The under-screen material outlet of the secondary screening element is connected to the inlet of the second air separation element. The outlet of the second air separation element is respectively connected to the inlet of the humus soil recovery unit and the inlet of the second crushing element.

5. The stale waste sorting and recycling plastic pellet preparation system according to claim 4, characterized in that, The humus soil recovery unit includes a second magnetic separator and a second eddy current separator connected in sequence. The inlet of the second magnetic separator is connected to the outlet of the second air separation element.

6. The stale waste sorting and recycling plastic particle preparation system according to claim 1, characterized in that, The over-screen material outlet of the secondary screening element is connected to the inlet of the third air separation element. The outlet of the third air separation element is respectively connected to the inlet of the small aggregate recovery unit and the inlet of the second crushing element.

7. The stale waste sorting and recycling plastic particle preparation system according to claim 6, characterized in that, The small aggregate recovery unit includes a third magnetic separator and a third eddy current separator connected in sequence. The inlet of the third magnetic separator is connected to the outlet of the third air separation element.

8. The stale waste sorting and recycling plastic pellet preparation system according to claim 1, characterized in that, The plastic pellet preparation unit includes a relaxation screen, a water washing assembly and a drying and granulating assembly connected in sequence. A vibration separator is arranged at the outlet of the drying and granulating assembly.

9. The stale waste sorting and recycling plastic pellet preparation system according to claim 8, characterized in that, The water washing assembly includes a spiral water washer and a flotation machine connected in sequence. The water inlet, water outlet of the spiral water washer and the water inlet, water outlet of the flotation machine are all connected to a sedimentation tank.

10. The stale waste sorting and recycling plastic pellet preparation system according to claim 9, characterized in that, There are multiple spiral water washers arranged, and the multiple spiral water washers are connected in sequence.

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