KR101067584B1 - System to regenerate waste plastics and method to recycle water used there - Google Patents

Abstract

The present invention allows to reuse the water used to recycle waste plastics to reduce the amount of water used, as well as to reduce the cost of recycling, and to reduce the cost of equipment by smoothly recycling waste plastics without a separate water tank. The present invention relates to a waste plastic recycling system and a recycling method of water applied thereto.

The present invention is a pulverizer to remove the foreign matter on the waste plastic by injecting water while crushing the waste plastic to a predetermined standard; When the mixture of plastic pulverized and water from the pulverizer flows in, the sediment, water and plastic pulverized are layered according to the difference in specific gravity. A treatment tank for discharging water and sediment into a different line than the dewatering line; Dehydrator for dewatering the plastic pulverized product and the water discharged from the dewatering line when the water is introduced: an air blower for drying the dehydrated plastic pulverized and discharged to the discharge line; When a mixture of water and foreign substances from the treatment tank and the dehydrator flows in, it separates the foreign substances with a certain particle diameter and the water containing the foreign substances with smaller particle size by vibration and discharges the foreign substances having a relatively large particle diameter to the waste line. Vibration separator; And a sedimentation tank that causes precipitation due to the difference in specific gravity when water containing foreign substances having a relatively small particle diameter is introduced, and only the upper water is fed back into the grinder. In this way, the water is not immediately introduced into the underground water storage tank. It can be re-introduced into the grinder, which can increase the recyclability of water, and can significantly reduce the replenishment of water supply, and it does not require a separate storage tank, thereby reducing the equipment cost required for the construction of the storage tank.

Waste Plastic, Recycling, Water, Recycling

Description

System to regenerate waste plastics and method to recycle water used there}

The present invention relates to a waste plastic recycling system and a recycling method of water applied thereto, and more particularly, to reuse water used in recycling waste plastics, thereby reducing water consumption and reducing recycling costs. Waste plastics can be recycled smoothly without the need for a water tank.

In general, plastic is mainly made of unsaturated polyester (PET) such as PET bottles used for beverage bottles containing cola, cider, etc., PE, PP, HDPE containers which are non-edible household goods, and PE, PP, HDPE, etc. In other words, a large amount of waste plastic is collected through various paths and recycled through a recycling plant due to the establishment of a resource recycling policy.

Among plastics, those having a specific gravity lower than water are mainly collected and recycled through a separation process by specific gravity after crushing, which will be briefly described below with reference to FIG. 1.

First, in the process of crushing the collected plastic through the crusher 10 is a mechanical pulverization is made using a rotary blade, water to improve the grinding efficiency while cleaning the foreign matter, such as sand, cement, soil, etc. It is injected as such.

Accordingly, the waste plastic pulverized product leaving the crusher 10 is transferred to the treatment tank 20 through the transfer conveyor 11 together with the water.

In the treatment tank 20, materials such as sludge having a higher specific gravity than water, water, and plastic pulverized materials having a lower specific gravity than water form a sequential layer according to the difference in specific gravity.

A plurality of rotary blades 21 are installed at equal intervals so as to be rotated by the rotational force of a motor (not shown) across the treatment tank 20, and a dehydrator (opposite side of the plastic crushed product input position of the treatment tank 20) is provided. Transfer screw 22 communicating with the 30 is disposed to be inclined so that the plurality of rotary blades 21 is rotated to push the uppermost plastic pulverized to the feed screw 22 side of the processing tank 20, the transfer screw ( 22) the plastic pulverized product and some water are transferred to the dehydrator 30 together, and the plastic pulverized product dehydrated through the dehydrator 20 falls to the lower side of the dehydrator 30 to be dried by the air blower 40. At the same time, it is transported to the discharge position and discharged, and these plastic pieces are collected and recycled.

In addition, the lower surface of the treatment tank 20, sludge discharge screw 23 is formed in the opposite direction with respect to the center, the motor is connected to one end of the sludge discharge screw 23, the treatment tank 20 The sludge can be collected at the center of the lower surface, and the transfer screw 24 is inclined at the center of the outer lower surface of the treatment tank 20. , Other foreign matters can be discharged to the outside through the transfer screw 24 together with the water, the bottom of the transfer screw 24 by placing a bag made by weaving a synthetic resin film to pass water through the underground reservoir tank (50) ), And the large particles are put in a bag (25) to collect them and discard them, and water from the dehydrator (30) is also collected in the underground reservoir tank (50).

The water from the treatment tank 20 and the water passed through the bag 25 or the water discharged from the dehydrator 30 must be mixed with plastic, sand, soil, cement, and other foreign substances having a fine particle size, so that the underground storage tank 50 According to the difference in specific gravity in the state where water is stored in the water, the material having a higher specific gravity than the water, water, and the material having a lighter specific gravity than water must form three layers, of which the pump 60 is connected to the intermediate layer of water to form an intermediate layer. Only water is reloaded into the grinder (10).

If sediment accumulates continuously in these reservoir tanks, it is inevitable that the water capacity will be gradually reduced. To solve this problem, the sediment should be removed from time to time. Since the reservoir tank is located underground and its storage capacity is very large, the sediment is collected by manpower. It was not possible to remove it, so the waste handler is collecting it by machine and landfilling it as landfill.

However, the sediments tend to harden in the form of 도 even after a short period of time in the precipitated state due to the very small particles. Therefore, when removing the sediment, air is blown into the bottom of the reservoir tank to form a sediment like 뻘. Since it is collected by suction after mixing with water, sediment treatment is very cumbersome and expensive. Due to the three-layer structure inside the water tank, the water located in the middle is blocked and its oxygen supply is impossible, which causes water This stagnation caused corruption and easily caused odors, as well as corresponding amounts of water had to be covered by the tap water, so they could not afford the water price and gave up their business.

In addition, in order to secure a low capacity, because a large number of large storage tanks are provided at the bottom of the plastic recycling plant, there is a disadvantage in that a lot of equipment costs are required.

The present invention has been proposed in view of such a point, and it is possible to reuse the water used when recycling waste plastics, thereby reducing the water consumption and reducing the cost of recycling, and it is possible to smoothly recycle waste plastics without a separate water tank. It is to provide a waste plastic recycling system and a method of recycling the water applied to reduce the equipment cost.

In order to solve this problem, the present invention is a pulverizer to remove the foreign matter on the waste plastic by injecting water while grinding the waste plastic to a predetermined standard; When the mixture of plastic pulverized and water from the crusher is introduced, the sediment, water and plastic pulverized are layered according to the difference in specific gravity, and the plastic pulverized and some water are discharged to the dehydration line through a plurality of rotary vanes. A treatment tank for discharging water and sediment into a different line than the dewatering line; Dehydrator for dewatering the plastic pulverized product and the water discharged from the dewatering line when the water is introduced: an air blower for drying the dehydrated plastic pulverized and discharged to the discharge line; When a mixture of water and foreign substances from the treatment tank and the dehydrator flows in, it separates the foreign substances with a certain particle diameter and the water containing the foreign substances with smaller particle size by vibration and discharges the foreign substances having a relatively large particle diameter to the waste line. Vibration separator; And when the water containing the foreign matter having a relatively small particle diameter is introduced into the waste plastic regeneration system including a sedimentation tank so that precipitation occurs by the difference in specific gravity and only the upper water is fed back to the crusher.

Optionally, the sedimentation tank is equipped with a step to settle without discharging material having a specific gravity greater than water at the discharging end of the channel configured to be inclined to gradually increase toward the discharge side, and collects the water discharged from the sedimentation tank in succession. An intermediate reservoir and a pump for pumping the water collected in the intermediate reservoir into the grinder may be further provided.

In addition, the present invention to recycle the water applied to the waste plastic recycling system is a step of removing the foreign matter on the waste plastic by injecting water together when crushing the waste plastic through the crusher; Injecting the mixture of the pulverized plastic pulverized product and water into a treatment tank and separating the pulverized plastic pulverized product into water, water, and material with heavier specific gravity than the water according to the difference in specific gravity; Dehydrating the plastic pulverized product and some water having a specific gravity smaller than water through a dehydrator to recycle the plastic pulverized product; Separating the mixture of foreign matter and water from the dehydrator through a vibration separator to discard the foreign matter having a relatively large particle size and discharging the mixture of foreign matter and water of the remaining fine particle to the precipitation tank; Separating the material and the water having a specific gravity discharged from the treatment tank through water through a vibration separator to discard foreign substances having a relatively large particle diameter and discharging the foreign substances and water of the remaining fine particle to the precipitation tank; And in the process of moving the water through the settling tank is characterized in that the heavy gravity contained in the water is precipitated, and the method comprising the step of re-supplying only the upper water back to the grinder.

According to the present invention, most of the foreign matter having a certain particle size can be separated and disposed of through the vibration separator of the wastewater including the foreign matter generated in the waste plastic recycling process, and the foreign matter in the process of moving the water containing the fine foreign matter through the treatment tank. Most of the precipitate is separated from the water and can be reused by putting the water back into the grinder to increase the recyclability of the water, as well as to reduce the production cost of the tap water.

In addition, the water continues to fall through the crusher, treatment tank, dehydrator, vibration separator, sedimentation tank and aeration occurs, so the water is not easily decayed and can extend the service life of the water. Waste plastics can be recycled smoothly without any significant cost savings.

In addition, the material precipitated in the sedimentation tank may be floated and disposed of periodically, so that there is no additional cost for waste disposal.

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the attached drawings.

2 is a block diagram of a waste plastic recycling system according to the present invention, Figure 3 is a schematic configuration diagram of a waste plastic recycling system according to the present invention, Figure 4 is a detailed configuration of the sedimentation tank according to the present invention.

Below, the same code | symbol is attached | subjected about the component same as a prior art, and the description may be abbreviate | omitted.

Waste plastic recycling system according to the present invention is composed of a pulverizer (10), treatment tank 20, dehydrator (30), vibration separator (70), sedimentation tank (80), vibration separator (70) in the general waste plastic recycling system And sedimentation tank 80 is added more.

That is, the waste plastic is collected and crushed finely according to a predetermined standard through a general crusher 10 of the blade rotating method. Since waste plastic is provided with sand, cement, soil, and other foreign matters, the waste plastic is crushed. Water is added together to remove debris.

Therefore, when the waste plastic is pulverized out, the plastic pulverized product comes out in a mixed state with water, and the mixture of the plastic pulverized product and water is transferred to the treatment tank 20 by the transfer conveyor 11.

The treatment tank 20 is formed in the shape of a rectangular container having a constant volume, so that the mixture of the plastic pulverized powder and water introduced into the treatment tank 20 is gradually lighter in weight than the plastic pulverized powder, water and a substance having a heavier specific gravity than the water. The upper part of the treatment tank 20 is provided with a plurality of rotary blades 21 rotated by the motor at equal intervals, so that the plastic crushed powder and some water dehydrator are lighter than the water located at the uppermost part. It may be introduced into the dehydrator 30 through the transfer screw 22 connected to the (30).

The dehydrator 30 uses a general centrifugal dehydrator. The dehydrator 30 has a dehydration hole (not shown) in the dehydration tank, so that a plastic pulverized product smaller than the standard falls through the dehydration hole together with water. Dewatering is made out, the dehydrated plastic pulverized is dried by the air blower (40) and transferred to the discharge line can be recycled in the manufacturing process of the plastic product.

In addition, the sludge of the lower surface of the treatment tank 20 is collected in the center through the sludge discharge screw 23, and the specific gravity is higher than that of the water and water except the plastic pulverized through the transfer screw 24 connected to the center of the outer lower surface of the treatment tank. Heavy sand, cement, soil, and other foreign matter are released to the outside with water.

The dehydrator 30 and the treatment tank 20 and the vibration separator 70 are arranged in succession, respectively, so that the specific gravity is higher than the water including the foreign matters that are discharged through the dehydrator 30 and the water and the water discharged from the treatment tank 20. Heavy material flows into the vibration separator 70, respectively.

At this time, the vibration separator 70 may use a general vibration screen, may be developed separately for more detailed screening may be applied to a new device, such that when a mixture of foreign matter and water flows into the top of the vibration separator 70 The foreign matter having a large particle size in the mixture is separated and discharged to the outside, and at the same time, the mixture of fine foreign matter and water is respectively transferred to the settling tank 80 through a transfer hose 71 connected to the vibration separator 70. Of course, foreign substances discharged to the outside are collected separately and disposed of.

The settling tank 80 is provided with a step 82 so as to settle without discharging a substance having a specific gravity greater than water at the discharging end of the waterway 81 configured to be inclined so as to gradually increase toward the discharge side, and to the settling tank 80. Subsequently, the intermediate reservoir 90 for collecting the water discharged from the settling tank 80 and the pump 60 for pumping the water collected in the intermediate reservoir 80 to the grinder 10 are further provided. When it is introduced into the 80, the sedimentation occurs naturally due to the difference in specific gravity while moving along the inclined waterway 81 forming the sedimentation tank 80, and at the end of the sedimentation tank 80, only the clean water of the upper layer exceeds the step 82. Discharged into the intermediate reservoir (90), the water is introduced into the grinder 10 by the pump 60 connected to the intermediate reservoir (90).

In FIG. 3, the plastic pulverized object to be recycled is represented by a solid line, a foreign substance by a dashed line, and a water by a silver line.

As described above, according to the present invention, since the water including the foreign matter from all the processes is recycled by recirculation, the amount of water used can be significantly reduced, and a separate water storage tank is not required, thereby reducing equipment costs. Of course, it is apparent that one or more storage tanks may be provided in the basement so that water splashing or flowing out during the recycling of waste plastic may flow back into the storage tank of the underground.

In addition, each of the components applied to the present invention may be provided with a system by applying a generally known device individually, and in some cases it is possible to develop and apply a new device suitable for the waste plastic recycling process In particular, the settling tank 80 is to implement a long length settling tank in a narrow space by connecting a plurality of channels 81 in a zigzag form.

1 is a block diagram of a conventional waste plastic recycling system.

Figure 2 is a block diagram of a waste plastic recycling system according to the present invention.

3 is a schematic configuration diagram of a waste plastic recycling system according to the present invention;

Figure 4 is a detailed configuration of the sedimentation tank according to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

10: Grinder 11: Transfer Conveyor

20: treatment tank 21: rotary blade

22,24: transfer screw 23: sludge discharge screw

25: bag 30: dehydrator

40: air blower 50: water storage tank

60: pump 70: vibration separator

71: transfer hose 80: sedimentation tank

81: channel 82: step

90: intermediate reservoir

Claims (3)

A pulverizer for removing foreign matters on waste plastic by injecting water while crushing waste plastic to a predetermined standard; When the mixture of plastic pulverized and water from the pulverizer is introduced, precipitates, water, and plastic pulverized are layered according to the difference in specific gravity, and the plastic pulverized and some water are discharged to the dehydration line through a plurality of rotary blades. A treatment tank for discharging the remaining water and sediment into a different line from the dehydration line; Dehydrator for dehydrating water from the plastic pulverized product and water discharged through the dewatering line flows in: An air blower for drying the dehydrated plastic powder and discharging it to a discharge line; When a mixture of water and foreign substances from the treatment tank and the dehydrator is introduced, foreign substances having a constant particle diameter and water containing foreign substances having a smaller particle size are separated from each other by vibration, and foreign substances having a relatively large particle diameter are discharged to a waste line. Two sets of vibration separators; And Waste water recycling system comprising a sedimentation tank so that when the water containing the foreign matter having a relatively small particle diameter is introduced, precipitation occurs due to the difference in specific gravity and only the upper water is fed back into the grinder. The method of claim 1, The settling tank is provided with a step so that the material is heavier than the specific gravity is discharged to the discharge end of the waterway configured to be inclined to gradually increase toward the discharge side without being discharged, And an intermediate reservoir for collecting water discharged from the sedimentation tank subsequent to the sedimentation tank, and a pump for pumping the water collected in the intermediate reservoir to the grinder. When the waste plastic is crushed through the crusher to add water together to remove the foreign matter on the waste plastic; Injecting the mixture of the pulverized plastic pulverized product and water into a treatment tank and separating the pulverized plastic pulverized product into water, water, and material with heavier specific gravity than the water according to the difference in specific gravity; Dewatering the plastic pulverized product and some water having a specific gravity smaller than water through a dehydrator to recycle the plastic pulverized product; Separating the mixture of foreign matter and water from the dehydrator through a vibration separator to discard the foreign matter having a relatively large particle size, and discharging the mixture of foreign matter and water of the remaining fine particle to a precipitation tank; Separating the substance and water having a specific gravity discharged from the treatment tank from water through a vibration separator to discard foreign substances having a relatively large particle size, and discharging the foreign substances and water having a remaining fine particle diameter to the precipitation tank; And In the process of moving the water through the sedimentation tank, the heavy specific gravity contained in the water is precipitated, and only the upper water is re-introduced to the grinder, comprising the step of recycling the water applied to the recycled plastics, characterized in that it comprises. .

Images