Plastic waste treatment system

Abstract

The invention discloses a plastic waste treatment system, including a crusher, a first separation sedimentation tank, an electrostatic sorting system and a second separation sedimentation tank, wherein the crusher is used to crush the plastic waste, the output end of the crusher is connected to the first separation sedimentation tank, and the crushed plastic waste is transported to the first separation sedimentation tank; the first separation sedimentation tank performs water sorting on the crushed plastic waste through the liquid stored therein, the first separation sedimentation tank is provided with a first floating material output end and a first bottom material output end, the main component of the material outputted from the first floating material output end is PE and / or PP, the first bottom material output end is connected to the electrostatic sorting system; the electrostatic sorting system is provided with an ABS output end and a PS output end, the main component of the material outputted from the ABS output end is ABS, the main component of the material outputted from the PS output end is PS, and the PS output end is connected to the second separation sedimentation tank. It can classify the plastic waste with PE / PP, ABS, environmentally friendly PS and non-environmentally friendly PS as the main components.

Description

Technical Field

[0001] The invention relates to a plastic waste processing system. Background Art

[0002] The main raw materials of plastic waste are the shells of white appliances, black appliances, etc., which contain components such as PS and ABS. The existing plastic waste treatment system can only perform basic level separation on the plastic waste mixture, that is, it is limited to separating the plastic waste into two or three main components, namely PS and ABS.

[0003] For example, Chinese patent 201420632798.7, which relates to a waste household appliance plastic recycling and processing system, in particular, a waste household appliance plastic shell processing system that integrates crushing, sorting, cleaning and drying. It includes a crushing system, a cleaning system and a drying system, and is characterized in that: the crushing system includes a tearing machine and a fine crushing machine, the cleaning system includes a friction cleaning machine, a primary rinsing machine, a hot cleaning machine and a secondary rinsing machine, and the drying system includes a dehydrator and a dryer. The present invention first crushes the plastic shell of large parts such as waste household appliances into small pieces by a primary tearing machine, and crushes the irregular shell plastic into small pieces, uniform-sized flakes or granular plastics by a fine crusher, and then passes through the fine crusher and is transferred to the primary rinsing machine, the hot cleaning machine, and the secondary rinsing machine for cleaning, impurity removal and sorting. Finally, the separated plastic passes through a dehydrator and a dryer for dehydration, drying and dust removal. The entire recycling system effectively reduces the manual recycling cost of waste household appliance plastics, increases the utilization rate of plastic raw materials, and is environmentally friendly and energy-saving. The patented solution is used to separate plastic waste into PS, ABS, PVC, etc.

[0004] As the materials used for the shells of white and black appliances become more diverse, the types of components contained in the crushed plastic waste are also increasing, such as PE, PP, ABS, PS, etc., among which PS is divided into environmentally friendly PS and non-environmentally friendly PS. At present, how to efficiently and continuously classify plastic waste into PE / PP, ABS, environmentally friendly PS and non-environmentally friendly PS as the main components has become an urgent problem to be solved in the industry. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, an object of the present invention is to provide a plastic waste processing system, which can classify plastic waste into PE / PP, ABS, environmentally friendly PS and non-environmentally friendly PS as main components.

[0006] The purpose of the present invention is achieved by the following technical solutions:

[0007] A plastic waste treatment system, comprising a crusher, a first separation sedimentation tank, an electrostatic separation system and a second separation sedimentation tank, wherein:

[0008] The crusher is used to crush the plastic waste, the output end of the crusher is connected to the first separation sedimentation tank, and the crushed plastic waste is transported to the first separation sedimentation tank;

[0009] The first separation sedimentation tank performs water separation on the crushed plastic waste through the liquid stored therein, and the first separation sedimentation tank is provided with a first floating material output end and a first bottom material output end, the main components of the material outputted from the first floating material output end are PE and / or PP, and the first bottom material output end is connected to the electrostatic separation system;

[0010] The electrostatic separation system is provided with an ABS output end and a PS output end, the main component of the material outputted by the ABS output end is ABS, the main component of the material outputted by the PS output end is PS, and the PS output end is connected to the second separation sedimentation tank;

[0011] The second separation sedimentation tank uses the liquid stored therein to water-select the material input from the PS output end. The second separation sedimentation tank is provided with a second floating material output end and a second bottom material output end. The main component of the material output from the second floating material output end is environmentally friendly PS, and the main component of the material output from the second bottom material output end is non-environmentally friendly PS.

[0012] Specifically, a first friction cleaning machine and a first vertical dehydrator are connected between the crusher and the first separation sedimentation tank, wherein:

[0013] The input end of the first friction cleaning machine is connected to the output end of the crusher, the first friction cleaning machine is used to clean materials, the solid output end of the first friction cleaning machine is connected to the input end of the first vertical dehydrator, the first vertical dehydrator is used to dehydrate materials, and the solid output end of the first vertical dehydrator is connected to the input end of the first separation sedimentation tank.

[0014] Specifically, a first screw conveyor is provided at the input end of the crusher, and a second screw conveyor is provided between the first vertical dehydrator and the first separation sedimentation tank.

[0015] Specifically, the output end of the first floating water material is sequentially connected to a third screw conveyor and a second vertical dehydrator, and the second vertical dehydrator is used to dehydrate the first floating water material.

[0016] Specifically, the output end of the first bottom sediment material is sequentially connected to a fourth screw conveyor and a third vertical dehydrator, and the third vertical dehydrator is used to dehydrate the first bottom sediment material.

[0017] Specifically, a first heating and stirring machine is connected between the output end of the third vertical dehydrator and the electrostatic separation system, and the first heating and stirring machine is used to heat the first bottom sediment material to dry the first bottom sediment material.

[0018] Specifically, a first silica gel remover is connected between the output end of the third vertical dehydrator and the first heating and stirring machine, and the first silica gel remover is used to remove silica gel impurities in the first bottom sediment.

[0019] Specifically, the electrostatic sorting system includes a first Class A sorting machine and a second Class A sorting machine. The input ends of the first Class A sorting machine and the second Class A sorting machine are respectively connected to the output end of the first heating mixer. The first Class A sorting machine and the second Class A sorting machine are both provided with a PP / PE primary sorting trough, an ABS primary sorting trough and a PS primary sorting trough. The PP / PE primary sorting trough is used to collect plastic waste whose main components are PP and / or PE, the ABS primary sorting trough is used to collect plastic waste whose main components are ABS, and the PS primary sorting trough is used to collect plastic waste whose main components are PS.

[0020] Specifically, the electrostatic sorting system includes a first Class B sorter, the ABS primary sorting trough is connected to the input end of the first Class B sorter through a conveying mechanism, the first Class B sorter is provided with a PA sorting trough, an ABS secondary sorting trough and a first circulation sorting trough, the PA sorting trough is used to collect plastic waste whose main component is PA, the ABS secondary sorting trough is used to collect plastic waste whose main component is ABS, the first circulation sorting trough is used to collect the remaining plastic waste output from the first Class B sorter, the plastic waste treatment system is provided with a first circulation conveying mechanism, the first circulation sorting trough is connected to the first circulation conveying mechanism, and the output end of the first circulation conveying mechanism is connected to the input end of the first Class A sorter and the second Class A sorter respectively.

[0021] Specifically, the electrostatic sorting system includes a second Class B sorter, the PS primary sorting trough is connected to the input end of the second Class B sorter through a conveying mechanism, the second Class B sorter is provided with a PP / PE secondary sorting trough, a PS secondary sorting trough and a second circulation sorting trough, the PP / PE secondary sorting trough is used to collect plastic waste whose main components are PE and / or PP, the PS secondary sorting trough is used to collect plastic waste whose main components are PS, and the second circulation sorting trough is used to collect the remaining plastic waste output from the second Class B sorter, the plastic waste treatment system is provided with a first circulation conveying mechanism, the second circulation sorting trough is connected to the first circulation conveying mechanism, and the output end of the first circulation conveying mechanism is connected to the input end of the first Class A sorter and the second Class A sorter respectively.

[0022] Specifically, the electrostatic sorting system includes a first Class C sorter, the PS secondary sorting trough is connected to the input end of the first Class C sorter through a conveying mechanism, the first Class C sorter is provided with a PS terminal sorting trough, a third circulation sorting trough and a fourth circulation sorting trough, the PS terminal sorting trough is used to collect plastic waste whose main component is PS, the third circulation sorting trough is connected to the first circulation conveying mechanism through a conveying mechanism, the electrostatic sorting system includes a second circulation conveying mechanism, the output end of the second circulation conveying mechanism is connected to the input ends of the first Class A sorter and the second Class A sorter respectively, and the fourth circulation sorting trough is connected to the second circulation conveying mechanism through a conveying mechanism.

[0023] Specifically, the PS terminal material distribution trough is connected to the second separation sedimentation tank through a conveying mechanism, and the second floating water material output end is sequentially connected to the fourth vertical dehydrator, the first clear water tank and the sixth vertical dehydrator.

[0024] Specifically, the PS terminal material distribution trough is connected to the second separation sedimentation tank through a conveying mechanism, and the second bottom material output end is sequentially connected to the fifth vertical dehydrator, the second clear water tank and the seventh dehydrator.

[0025] Specifically, the liquid stored in the first separation sedimentation tank is clean water.

[0026] Specifically, the liquid stored in the second separation sedimentation tank is brine, and the salinity of the brine is 5%-9%.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The main components of the material output from the first floating material output end are PE and / or PP, so that PE and / or PP are preliminarily separated.

[0029] The electrostatic separation system is provided with an ABS output terminal and a PS output terminal, wherein the main component of the material outputted from the ABS output terminal is ABS, so as to separate ABS. The main component of the material outputted from the PS output terminal is PS, so as to preliminarily separate PS.

[0030] The PS output end is connected to the second separation sedimentation tank, and the second separation sedimentation tank selects the material input from the PS output end through the liquid stored therein. The second separation sedimentation tank is provided with a second floating water material output end and a second bottom material output end. The main component of the material output from the second floating water material output end is environmentally friendly PS, and the main component of the material output from the second bottom material output end is non-environmentally friendly PS, thereby further separating the PS into environmentally friendly PS and non-environmentally friendly PS. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a general schematic diagram of the plastic waste treatment system;

[0032] Figure 2 is a partial view of part A of the plastic waste treatment system;

[0033] Figure 3 is a partial view of part B of the plastic waste treatment system;

[0034] Figure 4 is a partial view of part C of the plastic waste treatment system;

[0035] Figure 5 is a partial view of part D of the plastic waste treatment system;

[0036] Figure 6 is a top view of a plastic waste treatment system;

[0037] Figure 7 Schematic diagram of the electrostatic separation system in the plastic waste treatment system.

[0038] In the figure: 1, crusher; 21, first separation sedimentation tank; 22, second separation sedimentation tank; 31, first friction cleaning machine; 41, first vertical dehydrator; 42, second vertical dehydrator; 43, third vertical dehydrator; 44, fourth vertical dehydrator; 45, fifth vertical dehydrator; 46, sixth vertical dehydrator; 47, seventh vertical dehydrator; 51, first silica gel remover; 52, second silica gel remover; 53, third silica gel remover; 61, first heating mixer; 62, second heating mixer; 71, first class A sorter; 72, second class A sorter; 701, PP / PE primary sorting trough; 702, ABS primary sorting trough; 703, PS primary sorting trough; 73, first class B sorter; 731, PA sorting trough; 732, ABS secondary sorting trough; 733, first Circulation dividing trough; 74, first circulation conveying mechanism; 75, second class B separator; 751, PP / PE secondary dividing trough; 752, PS secondary dividing trough; 753, second circulation dividing trough; 76, first class C separator; 761, PS terminal dividing trough; 762, third circulation dividing trough; 763, fourth circulation dividing trough; 77, second circulation conveying mechanism; 81, third screw conveyor; 82, fourth screw conveyor; 83, seventh screw conveyor; 84, eighth screw conveyor; 85, second screw conveyor; 86, sixth screw conveyor; 87, first screw conveyor; 88, fifth screw conveyor; 91, second Z-type air separator; 92, first Z-type air separator; 101, first clear water tank; 102, second clear water tank; 111, first storage bin; 112, second storage bin. DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0040] See Figures 1 to 5 , a plastic waste treatment system, comprising a crusher 1, a first separation sedimentation tank 21, an electrostatic separation system and a second separation sedimentation tank 22, wherein:

[0041] The crusher 1 is used to crush plastic waste. Specifically, the plastic waste to be sorted comes from the plastic shells of white appliances, black appliances and other electrical appliances, such as computer monitor plastic shells, washing machine plastic shells, and the components of the plastic waste to be sorted mainly include PA, ABS, PS, PP and PE. The crusher 1 is used to crush the plastic shell to form plastic particles, small pieces or sheets with a size of 15mm-25mm. The output end of the crusher 1 is connected to the first separation sedimentation tank 21, and the crushed plastic waste is transported to the first separation sedimentation tank 21.

[0042] The first separation sedimentation tank 21 uses the liquid stored therein to select the crushed plastic waste. Specifically, the liquid stored in the first separation sedimentation tank 21 is clean water. In this application, "clean water" specifically refers to the water density of 1 or close to 1, rather than the "clarity and cleanliness" of the water. The first separation sedimentation tank 21 is provided with a first floating material output end and a first bottom material output end. Under the buoyancy of the clean water stored in the first separation sedimentation tank 21, the main components of PE (density of 0.95) and / or PP (density of 0.92) float on the water surface of the first separation sedimentation tank 21, and the remaining plastic particles sink. Therefore, the main components of the material output from the first floating material output end are PE and / or PP. The first bottom material output end is connected to the electrostatic sorting system. Since the first separation sedimentation tank 21 does not float out all the materials containing PE and / or PP in the material during the sorting process, the first bottom material is a mixture of plastics containing components such as PA, ABS, PS, PP and PE.

[0043] The electrostatic sorting system is provided with an ABS output terminal and a PS output terminal. The main component of the material outputted from the ABS output terminal is ABS, and the main component of the material outputted from the PS output terminal is PS. The PS output terminal is connected to the second separation sedimentation tank 22, and the second separation sedimentation tank 22 further sorts the received material, that is, the second separation sedimentation tank 22 uses the liquid stored therein to sort the material inputted through the PS output terminal. Specifically, the liquid stored in the second separation sedimentation tank 22 is salt water, and the salinity of the salt water is 5%-9%. In this embodiment, the salinity of the salt water is 7%. The second separation sedimentation tank 22 is provided with a second floating water material output terminal and a second bottom sinking material output terminal. The density of environmentally friendly PS is lower than that of the salt water, and the density of non-environmentally friendly PS is higher than that of the salt water. Therefore, the main component of the material outputted from the second floating water material output terminal is environmentally friendly PS, and the main component of the material outputted from the second bottom sinking material output terminal is non-environmentally friendly PS.

[0044] Specifically, a first friction cleaning machine 31 and a first vertical dehydrator 41 are connected between the crusher 1 and the first separation sedimentation tank 21, wherein:

[0045] The input end of the first friction cleaning machine 31 is connected to the output end of the crusher 1. The friction cleaning machine is used to clean materials. The principle is as follows: the friction cleaning machine relies on the stirring blades installed on the rotating shaft inside the machine to strongly stir the materials during the rotation process to generate friction between the stirring blades and the materials, and between the materials, thereby playing the role of cleaning the materials.

[0046] The solid output end of the first friction cleaning machine 31 is connected to the input end of the first vertical dehydrator 41. The vertical dehydrator is used to dehydrate the material. The principle is as follows: after the material enters the vertical dehydrator, it is pushed and stirred by the main shaft spiral blades, and the material is rubbed inside the screen, so that some impurities and stolen goods (such as small sand and fine materials) are separated by friction, and then thrown out through the screen holes under the action of water and centrifugal force. The remaining materials to be processed are discharged at the discharge port, and the dehydration efficiency of the remaining materials to be processed is not less than 98%. The solid output end of the first vertical dehydrator 41 is connected to the input end of the first separation sedimentation tank 21. Specifically, the input end of the crusher 1 is provided with a first screw conveyor 87. A second screw conveyor 85 is provided between the first vertical dehydrator 41 and the first separation sedimentation tank 21.

[0047] Specifically, the output end of the first floating water material is connected in sequence to the third screw conveyor 81 and the second vertical dehydrator 42, and the second vertical dehydrator 42 is used to dehydrate the first floating water material. Preferably, the output end of the second vertical dehydrator 42 is connected to the first Z-type air separator 92, and the first Z-type air separator 92 is used to remove impurities such as dust and labels in the first floating water material.

[0048] Specifically, the output end of the first bottom material is connected to the fourth screw conveyor 82 and the third vertical dehydrator 43 in sequence. The third vertical dehydrator 43 is used to dehydrate the first bottom material. A first heating mixer 61 is connected between the output end of the third vertical dehydrator 43 and the electrostatic sorting system. The first heating mixer 61 is used to heat the first bottom material to dry the first bottom material so that the first bottom material can be better triboelectrically charged in the subsequent electrostatic sorting process. Preferably, a first silica gel remover 51 is connected between the output end of the third vertical dehydrator 43 and the first heating mixer 61, and the first silica gel remover 51 is used to remove silica gel impurities in the first bottom material. As a further preferred embodiment, a second Z-type air separator 91 is connected between the first silica gel remover 51 and the third vertical dehydrator 43, and the second Z-type air separator 91 is used to remove impurities such as dust and labels in the first bottom material. As a further preferred embodiment, the output end of the first heating mixer 61 is connected to a second heating mixer 62, and the second heating mixer 62 is used in conjunction with the first heating mixer 61, that is, the first heating mixer 61 preheats the material first, and the second heating mixer 62 further heats the material, so that the material is dried more fully and thoroughly, so as to generate electric charge by friction in the separator in the subsequent electrostatic separation system (in Figure 6 In the embodiment, since the first heating and stirring machine 61 and the second heating and stirring machine 62 are arranged in the vertical direction, Figure 6 Only one heating mixer is shown). The output end of the second heating mixer 62 is connected to the fifth screw conveyor 88, and the output end of the fifth screw conveyor 88 is connected to the input end of the electrostatic separation system. In this embodiment, a first storage bin 111 is connected between the second Z-type air separator 91 and the first silica gel remover 51. The first storage bin 111 is used to temporarily store materials. After the first storage bin 111 temporarily stores a sufficient amount of materials, the materials are then transported to the first silica gel remover 51 connected thereto, so that the subsequent electrostatic separation process can be carried out continuously and effectively.

[0049] Combination Figure 4 , Figure 6 , Figure 7 The electrostatic separation system includes a first A-class separator 71 and a second A-class separator 72. The input ends of the first A-class separator 71 and the second A-class separator 72 are connected to the output end of the fifth screw conveyor 88. It should be noted that the specific parameters such as "electrode polarity" and "electric field strength" of each separator in the electrostatic separation system are different, and can be set according to the plastic components that the separator expects to separate. Of course, the plastic component that is expected to be separated refers to "the enrichment of the component", rather than being absolutely 100% composed of the component.

[0050] The first A-class separator 71 and the second A-class separator 72 are both provided with three separators, namely, the PP / PE primary separator 701, the ABS primary separator 702 and the PS primary separator 703. The PP / PE primary separator 701 is used to collect plastic waste whose main components are PP and / or PE. The PP / PE primary separator 701 outputs the collected materials to the electrostatic separation system (along the discharge conveying mechanism) through the discharge conveying mechanism (the discharge conveying mechanism is an external device, independent of the separator, the same below). Figure 7 The ABS primary material distribution trough 702 is used to collect plastic waste whose main component is ABS. The PS primary material distribution trough 703 is used to collect plastic waste whose main component is PS.

[0051] Specifically, the electrostatic separation system includes a first B-class separator 73, and the ABS primary separation trough 702 is connected to the input end of the first B-class separator 73 through a discharge conveying mechanism. The ABS primary separation troughs 702 of the first A-class separator 71 and the second A-class separator 72 respectively convey the plastic waste mainly composed of ABS to the first B-class separator 73 (along the discharge conveying mechanism). Figure 7 center direction A2).

[0052] The first B-class sorting machine 73 is provided with a PA sorting trough 731, an ABS secondary sorting trough 732 and a first circulation sorting trough 733. The PA sorting trough 731 is used to collect plastic waste whose main component is PA. The PA sorting trough 731 outputs the collected materials to the electrostatic sorting system through the material discharging conveying mechanism and collects them at the PA collection point 782 (along the Figure 7 Center direction B1).

[0053] The ABS secondary material trough 732 is used to collect plastic waste whose main component is ABS. The ABS secondary material trough 732 outputs the collected materials to the electrostatic separation system through the material discharging conveying mechanism, and further conveys them to the second silicone removal machine 52 (along the Figure 7 The second silicone remover 52 is used to remove silicone impurities from the plastic waste whose main component is ABS. The first circulating material separation trough 733 is used to collect the remaining plastic waste output from the first B-class sorting machine 73.

[0054] The electrostatic separation system is provided with a first circulation conveying mechanism 74, and the first circulation material distribution trough 733 is connected to the first circulation conveying mechanism 74 through a discharging conveying mechanism (the material discharged from the first circulation material distribution trough 733 flows along the Figure 7 The output end of the first circulating conveying mechanism 74 ( Figure 7The output end of the first circulating conveying mechanism 74 and the input end of the first class A sorting machine 71 and the second class A sorting machine 72 are connected. It should be noted that the figure is only a schematic diagram, and the connection state between the output end of the first circulating conveying mechanism 74 and the input end of the first class A sorting machine 71 and the second class A sorting machine 72 is not actually shown.

[0055] Specifically, the electrostatic separation system includes a second B-class separator 75 and a first C-class separator 76. The PS primary separation trough 703 is connected to the input end of the second B-class separator 75 through a discharge conveying mechanism (along the Figure 7 The second B-class separator 75 is provided with a PP / PE secondary separator 751, a PS secondary separator 752 and a second circulation separator 753. The PP / PE secondary separator 751 is used to collect plastic waste whose main components are PE and / or PP. The PP / PE secondary separator 751 outputs the collected materials to the electrostatic separation system through the discharge conveying mechanism and collects them at the PP / PE second collection place 783 (the materials discharged from the PP / PE secondary separator 751 flow in the direction shown in FIG. Figure 7 The PS secondary material trough 752 is used to collect plastic waste whose main component is PS. The PS secondary material trough 752 outputs the collected materials to the first C-class sorting machine 76 through the material discharging conveying mechanism (the flow direction of the materials discharged from the PS secondary material trough 752 is as shown in FIG. Figure 7 The second circulating feed trough 753 is used to collect the remaining plastic waste output from the second B-class sorting machine 75. The second circulating feed trough 753 is connected to the first circulating conveying mechanism 74 through a discharge conveying mechanism (the flow direction of the material discharged from the second circulating feed trough 753 is as shown in FIG. Figure 7 Center direction C3).

[0056] The first Class C sorting machine 76 is provided with a PS terminal sorting trough 761, a third circulation sorting trough 762 and a fourth circulation sorting trough 763. The PS terminal sorting trough 761 is used to collect plastic waste whose main component is PS. The PS terminal sorting trough 761 outputs the collected materials to the electrostatic sorting system through the material discharging conveying mechanism and inputs them into the third silica gel removal machine 53 (the flow direction of the materials discharged from the PS terminal sorting trough 761 is as shown in FIG. Figure 7 The third circulating material distribution trough 762 is connected to the first circulating conveying mechanism 74 through the material discharging conveying mechanism (the flow direction of the material discharged by the third circulating material distribution trough 762 is as follows: Figure 7 middle direction D2).

[0057] The electrostatic separation system includes a second circulating conveying mechanism 77, the output end of the second circulating conveying mechanism 77 ( Figure 7The fourth circulating feed trough 763 is connected to the second circulating feed trough 763 through the discharge conveying mechanism (the flow direction of the material discharged by the fourth circulating feed trough 763 is as shown in FIG. Figure 7 Center direction D3).

[0058] The electrostatic sorting system has a Class A sorter, a Class B sorter, and a Class C sorter. The Class A sorter is used for preliminary sorting, discharging some of the impurities (PP / PE) with higher enrichment, and the remaining impurities enter the first Class B sorter 73 and the second Class B sorter 75 for further sorting. Then, the first Class B sorter 73 discharges some of the impurities (PA) with higher enrichment, and the second Class B sorter 75 discharges some of the impurities (PP / PE) with higher enrichment. Then, the second Class B sorter 75 inputs some of the remaining impurities into the first Class C sorter 76, and the first Class C sorter 76 discharges some of the impurities (PS) with higher enrichment.

[0059] After three-stage sorting, the materials can be more specifically sorted out in the corresponding sorting machine.

[0060] In addition, the electrostatic sorting system includes a first circulating conveying mechanism 74 and a second circulating conveying mechanism 77. The first circulating material trough 733 and the second circulating material trough 753 are both connected to the first circulating conveying mechanism 74 through a discharging and outputting mechanism. The fourth circulating material trough 763 is connected to the second circulating conveying mechanism 77 through a discharging and conveying mechanism. Therefore, the materials that are not screened out by specific materials in the first B-class sorting machine 73 and the second B-class sorting machine 75 can be transported to the A-class sorting machine again through the first circulating conveying mechanism 74. Similarly, the materials that are not screened out by specific materials in the first C-class sorting machine 76 can be transported to the A-class sorting machine again through the second circulating conveying mechanism 77 for further sorting. By cyclic sorting, the sorting accuracy is improved.

[0061] It should be noted that the first Class A sorter 71, the second Class A sorter 72, the first Class B sorter 73, the second Class B sorter 75 and the first Class C sorter 76 are all provided with friction channels, conveyor belts and sorting electrodes. A rotating shaft is provided in the friction channel, and the rotating shaft is provided with a plurality of stirring blades. The stirring blades are used to stir the materials so that the materials rub against each other and become charged. The materials output through the friction channel fall onto the conveyor belt, and the sorting electrodes are provided at the output of the conveyor belt.

[0062] It should be noted that the above-mentioned discharge conveying mechanism is a vibrating conveyor. The first circulating conveying mechanism 74 is a vibrating conveyor. The second circulating conveying mechanism 77 is a vibrating conveyor.

[0063] The output end of the third silica gel remover 53 (the input material is plastic waste whose main component is PS) is connected to the second storage bin 112, and the second storage bin 112 collects plastic waste whose main component is PS (including environmentally friendly PS and non-environmentally friendly PS). The output end of the second storage bin 112 is connected to the sixth screw conveyor 86, and the output end of the sixth screw conveyor 86 is connected to the second separation sedimentation tank 22.

[0064] The plastic waste treatment system includes a first plastic waste treatment water circulation system, which includes a crusher 1, a first friction cleaning machine 31, a first vertical dewatering machine 41, and a first separation sedimentation tank 21. The solid output end of the crusher 1 is connected to the first friction cleaning machine 31, the solid output end of the first friction cleaning machine 31 is connected to the first vertical dewatering machine 41, the solid output end of the first vertical dewatering machine 41 is connected to the first separation sedimentation tank 21, and the first separation sedimentation tank 21 is provided with a first floating material output end and a first bottom material output end, the first floating material output end is sequentially connected to the third screw conveyor 81 and the second vertical dewatering machine 42, and the first bottom material output end is sequentially connected to the fourth screw conveyor 82 and the third vertical dewatering machine 43. The first plastic waste treatment water circulation system includes a first vibrating screen, a reaction device, a water treatment sedimentation tank, and an air flotation tank. The liquid output end of the first vibrating screen is connected to the reaction device, and the liquid output end of the reaction device is connected to the water treatment sedimentation tank. The liquid output end of the water treatment sedimentation tank is connected to the air flotation tank, and the liquid output end of the air flotation tank is connected to the second water storage tank. The liquid circulation structure of the first plastic waste treatment water circulation system is as follows:

[0065] The liquid output ends of the first friction cleaning machine 31 and the first vertical dehydrating machine 41 are connected to the input end of the first vibrating screen;

[0066] The output end of the second water storage tank is connected to the liquid input end of the first separation sedimentation tank 21;

[0067] The liquid output ends of the third screw conveyor 81 , the fourth screw conveyor 82 , the second vertical dehydrator 42 and the third vertical dehydrator 43 are connected to the liquid input ends of the crusher 1 , the first friction cleaning machine 31 and the first vertical dehydrator 41 .

[0068] Specifically, the input end of the first vibrating screen is connected to the first belt cutting submersible pump, and the output ends of the first friction cleaning machine 31 and the first vertical dehydrating machine 41 are respectively connected to the first belt cutting submersible pump.

[0069] Specifically, the output end of the first vibrating screen is connected to the first water storage tank, and the first vertical submersible sewage pump is connected between the first water storage tank and the reaction device. Specifically, the first plastic waste treatment water circulation system includes a PAC dosing device and a PAM dosing device, and the output ends of the PAC dosing device and the PAM dosing device are connected to the reaction device. Both PAM and PAC are flocculants. In the water treatment sedimentation tank, the flocs formed by PAM and PAC make the colloids, insoluble particles and other impurities in the sewage adhere to them, so as to agglomerate the colloids and insoluble particles.

[0070] Specifically, the first plastic waste treatment water circulation system includes a sludge storage tank, and the output ends of the water treatment sedimentation tank and the flotation tank are connected to the sludge storage tank. After the liquid in the water treatment sedimentation tank is transported to the flotation tank, tiny bubbles are released from the bottom of the flotation tank, and the bubbles are attached to the above-mentioned flocs (the flocs are adhered with colloids and insoluble particles), so that the buoyancy of the flocs increases and floats to the surface of the flotation tank. Subsequently, the flocs that float to the surface of the flotation tank can be transferred to the sludge storage tank to complete the removal of colloids and insoluble particles in the sewage. The remaining liquid in the flotation tank is relatively clean and can be transported to the first separation sedimentation tank 21 for sorting.

[0071] Specifically, the output end of the mud storage tank is connected to a diaphragm pump, the output end of the diaphragm pump is connected to a plate-frame filter press, and the liquid output end of the plate-frame filter press is connected to the second water storage tank.

[0072] Specifically, the first plastic waste treatment water circulation system includes a second vertical submersible sewage pump, the input end of the second vertical submersible sewage pump is connected to the second water storage tank, and the output end of the second vertical submersible sewage pump is connected to the first separation sedimentation tank 21.

[0073] Specifically, the first plastic waste treatment water circulation system includes a second screw conveyor 85 , the solid input end of the second screw conveyor 85 is connected to the solid output end of the first vertical dehydrator 41 , and the solid output end of the second screw conveyor 85 is connected to the solid input end of the first separation sedimentation tank 21 .

[0074] Specifically, the first plastic waste treatment water circulation system includes a second belt cutting submersible pump, and the liquid output ends of the third screw conveyor 81, the fourth screw conveyor 82, the second vertical dehydrator 42 and the third vertical dehydrator 43 are connected to the input end of the second belt cutting submersible pump. The liquid input ends of the crusher 1, the first friction cleaning machine 31, the first vertical dehydrator 41 and the second screw conveyor 85 are connected to the second belt cutting submersible pump.

[0075] Specifically, the first plastic waste treatment water circulation system includes a first screw conveyor 87, the input end of the first belt cutting submersible pump is connected to the liquid output end of the first screw conveyor 87, the solid output end of the first screw conveyor 87 is connected to the crusher 1, and the input end of the first screw conveyor 87 is used to receive materials.

[0076] Specifically, the first vibrating screen is a first circular vibrating screen.

[0077] Specifically, the water treatment sedimentation tank is an inclined plate sedimentation tank.

[0078] The liquid discharged after the first friction cleaning machine 31 frictionally cleans the material, and the liquid discharged after the first vertical dehydrator 41 dehydrates the material are both transported to the first vibrating screen. After the first vibrating screen filters and removes impurities from the liquid, the liquid is input to the reaction device for further processing, so that the impurities in the liquid are further precipitated and separated to form clean water, which enters the second water storage tank for storage. The output end of the second water storage tank is connected to the liquid input end of the first separation sedimentation tank 21, and is used to replenish the liquid stored in the first separation sedimentation tank 21.

[0079] The liquid discharged by the third screw conveyor 81, the fourth screw conveyor 82, the second vertical dewatering machine 42 and the third vertical dewatering machine 43 is derived from the liquid discharged simultaneously when the material is discharged from the first separation sedimentation tank 21. The liquid discharged by the above four is transported to the crusher 1, the first friction cleaning machine 31 and the first vertical dewatering machine 41 to perform preliminary cleaning on the materials that first enter the plastic waste treatment system.

[0080] In this way, the wastewater after the materials are washed by the crusher 1, the first friction washer 31 and the first vertical dehydrator 41 is filtered, impurities are removed, separated and precipitated to form clean water, which is then transported to the first separation sedimentation tank 21 for material sorting. After the materials are discharged from the first separation sedimentation tank 21, the liquid discharged by the third screw conveyor 81, the fourth screw conveyor 82, the second vertical dehydrator 42 and the third vertical dehydrator 43 is re-input into the crusher 1, the first friction washer 31 and the first vertical dehydrator 41 to wash the materials.

[0081] The sewage discharged by the crusher 1, the first friction cleaning machine 31 and the first vertical dewatering machine 41 is transported to the first vibrating screen, the reaction device, etc. for impurity removal and purification to form clean water. Then, the clean water is transported to the first separation sedimentation tank 21 for material sorting. After sorting, the first separation sedimentation tank 21 discharges the materials to the third screw conveyor 81, the fourth screw conveyor 82, the second vertical dewatering machine 42 and the third vertical dewatering machine 43. The liquid discharged by the third screw conveyor 81, the fourth screw conveyor 82, the second vertical dewatering machine 42 and the third vertical dewatering machine 43 when working is "secondary clean water". The cleanliness of "secondary clean water" is lower than that of the clean water in the first separation sedimentation tank 21, so the "secondary clean water" is transported to the crusher 1, the first friction cleaning machine 31 and the first vertical dewatering machine 41 to clean the materials that first enter the plastic waste treatment system. The plastic waste treatment water circulation system of the present invention realizes the circulation of three water clean states, namely sewage, clean water and "sub-clean water", so that the water application of the water circulation system forms a self-circulation, thereby reducing the discharge of sewage and achieving environmental protection and energy saving.

[0082] The plastic waste treatment system includes a second plastic waste treatment water circulation system, which includes a second separation sedimentation tank 22, and the second separation sedimentation tank 22 is provided with a second floating material output end and a second bottom material output end. The second floating material output end is sequentially connected to the seventh screw conveyor 83 and the fourth vertical dehydrator 44. The second bottom material output end is sequentially connected to the eighth screw conveyor 84 and the fifth vertical dehydrator 45. The second plastic waste treatment water circulation system includes a second vibrating screen and a third water storage tank, and the liquid output end of the second vibrating screen is connected to the third water storage tank. The liquid circulation structure of the second plastic waste treatment water circulation system is as follows:

[0083] The liquid output ends of the seventh screw conveyor 83, the fourth vertical dehydrator 44, the eighth screw conveyor 84 and the fifth vertical dehydrator 45 are connected to the second vibrating screen;

[0084] The third water storage tank is connected to the liquid input end of the second separation sedimentation tank 22 .

[0085] Specifically, the second plastic waste treatment water circulation system includes a third belt cutting submersible pump, the output end of which is connected to the second vibrating screen. The liquid output ends of the seventh screw conveyor 83, the fourth vertical dehydrator 44, the eighth screw conveyor 84 and the fifth vertical dehydrator 45 are all connected to the third belt cutting submersible pump.

[0086] Specifically, the second plastic waste treatment water circulation system includes a third vertical submersible sewage pump, the output end of the third water storage tank is connected to the third vertical submersible sewage pump, and the output end of the third vertical submersible sewage pump is connected to the liquid input end of the second separation sedimentation tank 22.

[0087] Specifically, the second plastic waste treatment water circulation system includes a first clean water tank 101 and a sixth vertical dehydrator 46 . The solid output end of the fourth vertical dehydrator 44 is connected to the first clean water tank 101 , and the solid output end of the first clean water tank 101 is connected to the sixth vertical dehydrator 46 .

[0088] Specifically, the second plastic waste treatment water circulation system includes a third vibrating screen, and the liquid output ends of the first clean water tank 101 and the sixth vertical dehydrator 46 are connected to the third vibrating screen.

[0089] Specifically, the second plastic waste treatment water circulation system includes a fourth submersible pump with a cutting belt, and the liquid output ends of the first clean water tank 101 and the sixth vertical dehydrator 46 are respectively connected to the fourth submersible pump with a cutting belt, and the output end of the fourth submersible pump with a cutting belt is connected to the third vibrating screen.

[0090] Specifically, the second plastic waste treatment water circulation system includes a fourth water storage tank, the input end of the fourth water storage tank is connected to the liquid output end of the third vibrating screen, and the output end of the fourth water storage tank is connected to the first clean water tank 101.

[0091] Specifically, the second plastic waste treatment water circulation system includes a fourth vertical submersible sewage pump, the output end of the fourth water storage tank is connected to the fourth vertical submersible sewage pump, and the output end of the fourth vertical submersible sewage pump is connected to the first clean water tank 101.

[0092] Specifically, the second plastic waste treatment water circulation system includes a second clean water tank 102 and a seventh vertical dehydrator 47. The solid output end of the fifth vertical dehydrator 45 is connected to the second clean water tank 102, and the solid output end of the second clean water tank 102 is connected to the seventh vertical dehydrator 47.

[0093] Specifically, the liquid output ends of the second clear water tank 102 and the seventh vertical dehydrator 47 are connected to the third vibrating screen.

[0094] Specifically, the second plastic waste treatment water circulation system includes a fifth submersible pump with a cutting belt, and the liquid output ends of the second clean water tank 102 and the seventh vertical dehydrator 47 are respectively connected to the fifth submersible pump with a cutting belt, and the output end of the fifth submersible pump with a cutting belt is connected to the third vibrating screen.

[0095] Specifically, the input end of the fourth water storage tank is connected to the liquid output end of the third vibrating screen, and the output end of the fourth water storage tank is connected to the second clear water tank 102 .

[0096] Specifically, the output end of the fourth water storage tank is connected to the fourth vertical submersible sewage pump, and the output end of the fourth vertical submersible sewage pump is connected to the second clean water tank 102 .

[0097] Specifically, the second vibrating screen is a second circular vibrating screen.

[0098] Working principle of the second plastic waste treatment water circulation system: The liquid output ends of the seventh screw conveyor 83, the fourth vertical dewatering machine 44, the eighth screw conveyor 84 and the fifth vertical dewatering machine 45 are connected to the second vibrating screen. The third water storage tank is connected to the liquid input end of the second separation sedimentation tank 22. The second separation sedimentation tank 22 discharges materials after sorting: the second floating water material is transported to the fourth vertical dewatering machine 44 through the seventh screw conveyor 83, and the second bottom sinking material is transported to the fifth vertical dewatering machine 45 through the eighth screw conveyor 84. In the process of the second floating water material being input to the seventh screw conveyor 83 and the second bottom sinking material being input to the eighth screw conveyor 84, part of the liquid stored in the second separation sedimentation tank 22 will enter the seventh screw conveyor 83 and the eighth screw conveyor 84, so the seventh screw conveyor 83 and the eighth screw conveyor 84 will discharge liquid in the process of conveying materials. The fourth vertical dewatering machine 44 and the fifth vertical dewatering machine 45 also discharge liquid in the process of shaking and dehydrating the materials. The liquid discharged by the seventh screw conveyor 83 and the eighth screw conveyor 84 and the liquid discharged by the fourth vertical dehydrator 44 and the fifth vertical dehydrator 45 are all transported to the second vibrating screen for impurity removal and then transported to the third water storage tank for storage. The liquid stored in the third water storage tank is supplemented with a reagent to form a liquid that can be used in the second separation sedimentation tank 22, that is, salt water. The liquid stored in the third water storage tank is transported to the second separation sedimentation tank 22 for material sorting.

[0099] In the plastic waste treatment water circulation system, the liquid produced by the seventh screw conveyor 83, the fourth vertical dehydrator 44, the eighth screw conveyor 84 and the fifth vertical dehydrator 45 during operation is transported to the second vibrating screen for impurity removal, and then transported to the third water storage tank for storage. In this way, the liquid produced by the seventh screw conveyor 83, the fourth vertical dehydrator 44, the eighth screw conveyor 84 and the fifth vertical dehydrator 45 during operation can be recycled to avoid direct discharge, thereby reducing water resource waste. After adding the reagent to the third water storage tank, the liquid stored in the third water storage tank can be used by the second separation sedimentation tank 22, thereby realizing the recycling of water, reducing the demand for new municipal water, thereby reducing water resource consumption, and thus being beneficial to environmental protection and energy saving.

[0100] The functions or working principles of the above crushers can be found in patent documents 201610641070.4, CN104971811B, CN206296027U, CN206296028U, and CN106423466A;

[0101] The functions or working principles of the above-mentioned friction cleaning machine can be referred to patent documents CN108357021A, CN103418570A, CN205650554U;

[0102] The functions or working principles of the above separation sedimentation tanks can be referred to in patent documents CN207841832U, CN107718367A, CN207240602U, and CN207240599U;

[0103] The function or working principle of the above vertical dehydrator can be referred to patent document CN207065999U;

[0104] The function or working principle of the above-mentioned silicone removal machine can be referred to patent document CN201621262376;

[0105] The function or working principle of the above-mentioned heating mixer can be referred to patent documents CN205980650U, CN204320143U, CN106288705A;

[0106] The functions or working principles of the above-mentioned Class A sorting machine, Class B sorting machine, and Class C sorting machine can refer to patent documents CN208004155U, CN1326381A, and CN202498038U;

[0107] The functions or working principles of the above-mentioned Z-type air separator can be referred to patent documents CN203494791U, CN208466512U, CN106423865A, CN205914396U, CN203061434U;

[0108] The function or working principle of the above-mentioned screw conveyor can be referred to patent documents CN207312679U, CN208070688U, and CN207450942U.

[0109] The patent documents disclose the parts, elements, components or devices related to the invention. Therefore, the structural relationship, positional relationship, force relationship, motion relationship, energy relationship, momentum relationship, etc. between the parts, elements and components not mentioned in this article can be understood by referring to the above-mentioned cited patent documents. The technical content of the patent documents cited in this article thus becomes part of the present patent application documents. If necessary, all published patent documents in the technical field involved in the invention can provide prior art references for this patent application.

[0110] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A plastic waste treatment system, characterized in that: It includes a crusher, a first separation sedimentation tank, an electrostatic separation system and a second separation sedimentation tank, wherein: The crusher is used to crush the plastic waste, the output end of the crusher is connected to the first separation sedimentation tank, and the crushed plastic waste is transported to the first separation sedimentation tank; The first separation sedimentation tank performs water separation on the crushed plastic waste through the liquid stored therein, and the first separation sedimentation tank is provided with a first floating material output end and a first bottom material output end, the main components of the material outputted from the first floating material output end are PE and / or PP, and the first bottom material output end is connected to the electrostatic separation system; The electrostatic separation system is provided with an ABS output end and a PS output end, the main component of the material outputted by the ABS output end is ABS, the main component of the material outputted by the PS output end is PS, and the PS output end is connected to the second separation sedimentation tank; The second separation sedimentation tank uses the liquid stored therein to water-select the material input from the PS output end. The second separation sedimentation tank is provided with a second floating material output end and a second bottom material output end. The main component of the material output from the second floating material output end is environmentally friendly PS, and the main component of the material output from the second bottom material output end is non-environmentally friendly PS. The output end of the first bottom sediment material is sequentially connected to a fourth screw conveyor and a third vertical dehydrator, and the third vertical dehydrator is used to dehydrate the first bottom sediment material; A first heating and stirring machine is connected between the output end of the third vertical dehydrator and the electrostatic separation system, and the first heating and stirring machine is used to heat the first bottom sediment material to dry the first bottom sediment material; The electrostatic separation system comprises a first Class A separator and a second Class A separator, wherein the input ends of the first Class A separator and the second Class A separator are connected to the output end of the first heating mixer, and the first Class A separator and the second Class A separator are both provided with a PP / PE primary separation trough, an ABS primary separation trough and a PS primary separation trough, wherein the PP / PE primary separation trough is used to collect plastic waste whose main components are PP and / or PE, the ABS primary separation trough is used to collect plastic waste whose main components are ABS, and the PS primary separation trough is used to collect plastic waste whose main components are PS; The electrostatic sorting system comprises a first Class B sorter, the ABS primary sorting trough is connected to the input end of the first Class B sorter through a conveying mechanism, the first Class B sorter is provided with a PA sorting trough, an ABS secondary sorting trough and a first circulating sorting trough, the PA sorting trough is used to collect plastic waste whose main component is PA, the ABS secondary sorting trough is used to collect plastic waste whose main component is ABS, the first circulating sorting trough is used to collect the remaining plastic waste output from the first Class B sorter, the plastic waste treatment system is provided with a first circulating conveying mechanism, the first circulating sorting trough is connected to the first circulating conveying mechanism, and the output end of the first circulating conveying mechanism is connected to the input end of each of the first Class A sorter and the second Class A sorter; The electrostatic separation system comprises a second Class B separator, the PS primary trough is connected to the input end of the second Class B separator through a conveying mechanism, the second Class B separator is provided with a PP / PE secondary trough, a PS secondary trough and a second circulating trough, the PP / PE secondary trough is used to collect plastic waste whose main components are PE and / or PP, the PS secondary trough is used to collect plastic waste whose main components are PS, the second circulating trough is used to collect the remaining plastic waste output from the second Class B separator, the plastic waste treatment system is provided with a first circulating conveying mechanism, the second circulating trough is connected to the first circulating conveying mechanism, and the output end of the first circulating conveying mechanism is connected to the input ends of the first Class A separator and the second Class A separator respectively; The electrostatic separation system comprises a first Class C separator, the PS secondary feed trough is connected to the input end of the first Class C separator through a conveying mechanism, the first Class C separator is provided with a PS terminal feed trough, a third circulation feed trough and a fourth circulation feed trough, the PS terminal feed trough is used to collect plastic waste whose main component is PS, the third circulation feed trough is connected to the first circulation conveying mechanism through a conveying mechanism, the electrostatic separation system comprises a second circulation conveying mechanism, the output end of the second circulation conveying mechanism is connected to the input end of the first Class A separator and the second Class A separator respectively, and the fourth circulation feed trough is connected to the second circulation conveying mechanism through a conveying mechanism; The first Class A sorting machine, the second Class A sorting machine, the first Class B sorting machine, the second Class B sorting machine and the first Class C sorting machine are all provided with friction channels, conveyor belts and sorting electrodes. A rotating shaft is provided in the friction channel, and the rotating shaft is provided with a plurality of stirring blades. The stirring blades are used to stir the materials so that the materials rub against each other and become charged. The materials output through the friction channel fall onto the conveyor belt, and the sorting electrodes are provided at the output of the conveyor belt.

2. The plastic waste treatment system according to claim 1, characterized in that: A first friction cleaning machine and a first vertical dehydrator are connected between the crusher and the first separation sedimentation tank, wherein: The input end of the first friction cleaning machine is connected to the output end of the crusher, the first friction cleaning machine is used to clean materials, the solid output end of the first friction cleaning machine is connected to the input end of the first vertical dehydrator, the first vertical dehydrator is used to dehydrate materials, and the solid output end of the first vertical dehydrator is connected to the input end of the first separation sedimentation tank.

3. The plastic waste treatment system according to claim 2, characterized in that: A first screw conveyor is provided at the input end of the crusher, and a second screw conveyor is provided between the first vertical dehydrator and the first separation sedimentation tank.

4. The plastic waste treatment system according to claim 1, characterized in that: The output end of the first floating water material is sequentially connected to a third screw conveyor and a second vertical dehydrator, and the second vertical dehydrator is used to dehydrate the first floating water material.

5. The plastic waste treatment system according to claim 1, characterized in that: A first silica gel remover is connected between the output end of the third vertical dehydrator and the first heating and stirring machine, and the first silica gel remover is used to remove silica gel impurities in the first bottom sediment.

6. The plastic waste treatment system according to claim 1, characterized in that: The PS terminal material distribution trough is connected to the second separation sedimentation tank through a conveying mechanism, and the second floating water material output end is sequentially connected to the fourth vertical dehydrator, the first clear water tank and the sixth vertical dehydrator.

7. The plastic waste treatment system according to claim 1, characterized in that: The PS terminal material distribution trough is connected to the second separation sedimentation tank through a conveying mechanism, and the second bottom material output end is sequentially connected to the fifth vertical dehydrator, the second clear water tank and the seventh dehydrator.

8. The plastic waste treatment system according to claim 1, characterized in that: The liquid stored in the first separation sedimentation tank is clean water.

9. The plastic waste treatment system according to claim 1, characterized in that: The liquid stored in the second separation sedimentation tank is brine, and the salinity of the brine is 5%-9%.

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