Harmless treatment method for mixed resin waste

Abstract

The invention relates to a harmless treatment method for mixed resin waste, which belongs to the technical field of resin waste and specifically comprises the following steps: cleaning the mixed resin waste in clear water, and dehydrating in a centrifugal dehydrator after cleaning; the dewatered mixed resin waste is put into a magnetic separator for magnetic separation, and metal in the waste is removed; the mixed resin waste obtained after magnetic separation is added into a grinding machine to be ground, and the mixed resin waste is ground to 1500 meshes through the grinding machine; the ground mixed resin waste is separated through a density method, PC is separated out, and then the separated mixed resin waste is cleaned and dried; the cleaned and dried mixed resin waste is separated through a hot melting method, and PE, EVA and PPR are sequentially separated out; the separated PC, PE, EVA and PPR are subjected to impurity removal and then serve as raw materials for producing pipes and hard plates, the process is simple, the resin waste can be effectively separated, and waste recycling is achieved.

Description

Technical Field

[0001] The present invention relates to a method for harmless treatment of mixed resin waste, belonging to the technical field of resin waste. Background Art

[0002] During the processing of resin materials, a large amount of resin waste is generated. The resin waste mainly includes a mixture of PE, EVA, PPR, PC, and impurities. These resin wastes accumulate in large quantities, forming light and easily dispersible waste, which plagues the treatment and development of the environment. Summary of the Invention

[0003] To solve the technical problems existing in the prior art, the present invention provides a method for harmless treatment of mixed resin waste with a simple process, which can effectively separate resin waste and realize the reuse of waste.

[0004] To achieve the above object, the technical solution adopted by the present invention is a method for harmless treatment of mixed resin waste, which is a mixture of PE, EVA, PPR, PC, and impurities, and is operated according to the following steps: S1. Put the mixed resin waste into clean water for washing, and after washing, put it into a centrifugal dehydrator for dehydration; S2. Put the dehydrated mixed resin waste into a magnetic separator for magnetic separation to remove metals in the waste; S3. Add the magnetically separated mixed resin waste into a grinder for grinding, and grind the mixed resin waste to 1500 meshes by the grinder; S4. Separate the ground mixed resin waste by the density method to separate PC, and then wash and dry the separated mixed resin waste; S5. Separate the washed and dried mixed resin waste by the hot melt method, and sequentially separate PE, EVA, and PPR; S6. After removing impurities from the separated PC, PE, EVA, and PPR, use them as raw materials for producing pipes and rigid plates.

[0005] Preferably, in step S4, add the ground mixed resin waste into an ethanol aqueous solution with a concentration of 50%, the density of the ethanol aqueous solution is 0.98 g / cm³, let it stand for 30 minutes, and separate the bottom precipitate, which is PC.

[0006] Preferably, in step S5, the washed and dried mixed resin waste is laid flat in a separator, and then a plurality of constant temperature heaters are placed on the top of the separator. The temperature of the constant temperature heaters is set at 90°C - 100°C and heated for 30 - 40 minutes to separate the melt. Then the temperature is set at 120°C - 130°C and heated for 30 - 40 minutes to separate the melt again. After the temperature cools down, the unmelted waste in the separator is poured out.

[0007] Preferably, the separator includes a placement groove and a filter screen arranged in the placement groove. The filter screen is used to filter the melt. A material receiving groove is placed at the bottom of the placement groove, and the material receiving groove is used to hold the melt. The pore size of the filter screen is 2000 mesh.

[0008] Compared with the prior art, the present invention has the following technical effects: The process of the present invention is simple and the treatment cost is low. It can effectively preliminarily separate resin waste, realize the recycling of resin waste, not only reduce soil pollution, air pollution and greenhouse gas emissions caused by landfilling or incineration, effectively reduce the damage to the ecological environment, but also relieve the dependence on raw resin materials, reduce the production cost of enterprises, create employment opportunities at the same time, promote the development of circular economy, and help achieve the goals of sustainable utilization of resources and green and low-carbon transformation. Description of the Drawings

[0009] Figure 1 It is a schematic structural diagram of the separator in the present invention. Detailed Embodiments

[0010] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0011] A method for harmless treatment of mixed resin waste, where the mixed resin waste is a mixture of PE, EVA, PPR, PC and impurities, and the operation is carried out according to the following steps. S1. Put the mixed resin waste into clean water for cleaning, and then put it into a centrifugal dehydrator for dehydration after cleaning. S2. Put the dehydrated mixed resin waste into a magnetic separator for magnetic separation to remove metals in the waste. S3. Add the magnetically separated mixed resin waste into a grinder for grinding, and grind the mixed resin waste to 1500 mesh by the grinder. S4. Separate the ground mixed resin waste by density method to separate out PC. Add the ground mixed resin waste into an ethanol aqueous solution with a concentration of 50%, the density of the ethanol aqueous solution is 0.98 g / cm³. After standing for 30 minutes, separate the bottom precipitate, which is PC. Then, clean and dry the separated mixed resin waste. S5. Separate the cleaned and dried mixed resin waste by hot melting method to sequentially separate out PE, EVA, and PPR. Spread the cleaned and dried mixed resin waste evenly in the separator, then place multiple constant temperature heaters on the top of the separator. Set the temperature of the constant temperature heaters at 90°C - 100°C and heat for 30 - 40 minutes to separate the melt. Then set the temperature at 120°C - 130°C and heat for 30 - 40 minutes to separate the melt again. After the temperature cools down, pour out the unmelted waste in the separator.

[0012] S6. After removing impurities from the separated PC, PE, EVA, and PPR, use them as raw materials for producing pipes and rigid plates.

[0013] Among them, as Figure 1 shown, the separator includes a placement groove 1 and a filter screen 2 arranged in the placement groove. The filter screen 2 is used to filter the melt. A receiving trough 3 is placed at the bottom of the placement groove 1, and the receiving trough 3 is used to hold the melt. The aperture size of the filter screen 2 is 2000 mesh. Spread the cleaned and dried mixed resin waste evenly on the filter screen 2, with a spreading thickness of 3 - 5 cm. Then heat it through a constant temperature heater. The bottom receiving trough 3 can receive the melt, and different melts can be received through different receiving troughs.

[0014] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the scope of the present invention.

Claims

1. A method for harmless treatment of mixed resin waste, the mixed resin waste being a mixture of PE, EVA, PPR, PC and impurities, characterized in that : Operate according to the following steps. S1. Put the mixed resin waste into clean water for cleaning, and then put it into a centrifugal dehydrator for dehydration after cleaning. S2. Put the dehydrated mixed resin waste into a magnetic separator for magnetic separation to remove metals in the waste. S3. Add the magnetically separated mixed resin waste into a grinder for grinding, and grind the mixed resin waste to 1500 meshes by the grinder. S4. Separate the ground mixed resin waste by the density method to separate out PC, and then clean and dry the separated mixed resin waste. S5. Separate the cleaned and dried mixed resin waste by the hot-melt method to sequentially separate out PE, EVA, and PPR. S6. After removing impurities from the separated PC, PE, EVA, and PPR, use them as raw materials for producing pipes and rigid plates.

2. The method for harmless treatment of a mixed resin waste according to claim 1, characterized in that : In step S4, add the ground mixed resin waste into an ethanol aqueous solution with a concentration of 50%, the density of the ethanol aqueous solution is 0.98 g / cm³, let it stand for 30 minutes, and separate the bottom precipitate, which is PC.

3. A method for harmless treatment of a mixed resin waste according to claim 1, characterized in that : In step S5, lay the cleaned and dried mixed resin waste flat in a separator, then place a plurality of constant-temperature heaters on the top of the separator, set the temperature of the constant-temperature heaters at 90°C - 100°C, heat for 30 - 40 minutes to separate the melt, then set the temperature at 120°C - 130°C, heat for 30 - 40 minutes to separate the melt again, and after the temperature cools down, pour out the unmelted waste in the separator.

4. The method for harmless treatment of a mixed resin waste according to claim 3, characterized in that : The separator includes a placement groove and a filter screen arranged in the placement groove. The filter screen is used to filter the melt. A material receiving groove is placed at the bottom of the placement groove, and the material receiving groove is used to hold the melt. The pore size of the filter screen is 2000 meshes.

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