JP2002317071A - Method for recycling hybrid-type plastic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for recycling hybrid-type plastics by which the recycling rate of a material of nonindustrial waste-based plastics disposed from a household is heightened, the plastics can be reused as a reclaimed material having a high additional value, the amount of a residue discharged to the outside of the system can be reduced, and the amount of the recovered formed oil can be increased. SOLUTION: This method for recycling the hybrid-type plastics comprises manually selecting the waste plastics to recycling raw materials of each separated polyethylene, polypropylene, polystyrene and polyethylene terephthalate, and oil-forming raw materials comprising other mixed plastics in a step for sorting mixed various kinds of the waste plastics received in an installation, removing foreign matters from the product at a wet gravity selecting step 8 after crushing each material of the recycling raw materials at a crushing step 7, granulating each crushed material at a granulating step 11 after removing the foreign matters to provide material-recycling products, crushing the oil-forming raw materials 4 at the crushing step 7, removing iron materials and aluminum materials from the crushed product at a magnetic selecting step 13 and an aluminum-selecting step 14, subjecting the iron materials and aluminum materials-removed product to a vinyl chloride-removing treatment at the wet gravity selecting step 8, and forming the product obtained at the foregoing step 8 into the oil at a thermal cracking and oil-forming step 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hybrid plastic recycling method, and more particularly to a technique for recycling plastic waste.

[0002]

2. Description of the Related Art Conventionally, general waste plastics discharged from homes are subjected to various processes such as bag breaking, crushing, and wind separation to remove foreign substances. It has gained. This oil technology is disclosed in Japanese Patent Application Laid-Open No. 3-867.
No. 91 discloses this. This is to pulverize a polyolefin plastic, then soften or melt it by heating with an extruder, introduce it into a melting and mixing tank, make the raw material uniform in the melting and mixing tank, and decompose the melt in a pyrolysis tank. In the pyrolysis tank, the melt is heated to a predetermined temperature in a heating furnace and circulated, and the vaporous product generated in the pyrolysis tank is catalytically decomposed in a zeolite catalyst tank after removing mist in a separator.

[0003]

By the way, in the above-mentioned conventional configuration, all the received materials are crushed and passed through a wind separator, but plastics suitable for material recycling among general waste plastics are used. When they are crushed and passed through a wind separator, they are sorted to the residue side as a considerable amount of foreign matter.

[0004] As a solution to this problem, the use of an automatic sorter is conceivable. However, the types of general waste plastics are very large, and some of them have only a small amount.
Increasing the sorting accuracy makes it harder to make profits in cost-effectiveness, and even more so when sorting crushed materials.

[0005] Waste plastics containing 0.5 WT% or more of chlorine and the like have problems such as generation of dioxin and corrosion of equipment, and are not suitable for use as fuel or blast furnace reduction material, and require landfill treatment. . Thus, the amount of miscellaneous plastic discarded without recycling is 50% of the amount received.
They reach up to 60% and are landfilled as industrial waste. However, the cost and landfill space are serious problems.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and increases the material recycling rate of general waste plastics discharged from homes, makes it a recycled material with high added value, and reduces the amount of residues discharged outside the system. Another object of the present invention is to provide a hybrid plastic recycling method capable of increasing the amount of generated oil to be recovered.

[0007]

In order to solve the above-mentioned problems, a hybrid plastic recycling method according to the present invention is a method of recycling a mixed plastic waste received in a facility for each material of polyethylene / polypropylene / polystyrene / polyethylene terephthalate. Material is manually separated into raw materials made from recycled materials and oiled raw materials made of other mixed plastics.The material recycled materials are crushed for each material, then wet-specific gravity sorted to remove foreign substances, and then granulated. Recycled material is crushed, and the liquefied raw material is crushed, then magnetically separated, and then aluminum is separated to remove irons and aluminums. It turns into oil.

[0008] With the above-mentioned configuration, by securing waste plastics of each material of polyethylene / polypropylene / polystyrene / polyethylene terephthalate by manual selection, it is possible to recover material recycled materials with high precision and at low cost, and to obtain a mixture that cannot be selected. By removing vinyl chloride, which is incompatible with oil, the plastic can be converted to oil without the generation of dioxin and corrosion of equipment and equipment, reducing the amount of landfill waste.
By providing both a waste plastic material recycling line and an oil treatment line, energy consumption required for waste plastic processing can be reduced, and the yield of waste plastic recycling can be improved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, general waste plastics discharged from homes include a plurality of types of plastics and are in a bag.

[0010] The mixed plastic waste received in the facility breaks the bag in the crushing step 1 and then removes foreign matter.
It is supplied to the sorting step 2. In the foreign matter removal / sorting step 2, waste plastics are manually sorted to recycle raw materials 3 for each material of polyethylene / polypropylene / polystyrene / polyethylene terephthalate, oily raw materials 4 made of other mixed plastics, metals 5, foreign substances・ Sorting to unsuitable 6

The material recycled material 3 is crushed in a crushing (fine crushing) step 7 for each material, and thereafter, a foreign substance is removed and coarsely cleaned in a wet specific gravity sorting / rough cleaning step 8, followed by a secondary cleaning step 9. It is dried in a drying step 10, and then granulated to a predetermined particle size in a granulation step 11, or is made into flakes as they are, and recycled materials (pellets, flakes)
Make 12

The liquefied raw material 4 is crushed in a crushing (fine crushing) step 7, after which irons 15 and aluminums 16 are removed in a magnetic separation step 13 and an aluminum selection step 14, and then in a wet specific gravity separation step 8. Remove vinyl chloride (flakes) 17,
Further, after being dried in the drying step 10, it is treated and oiled in the thermal decomposition / oiling step 18 to obtain the product oil 19 and the product gas 20, and the residue is used as the solid fuel 21. The crushing (fine crushing) step 7, the wet-type specific gravity sorting step 8, and the drying step 10 are shared by the waste plastic material recycling line and the oil treatment line.

The operation of the above configuration will be described below. Since the manual sorting in the foreign matter removal / sorting process 2 is performed by human work, waste plastics of each material of polyethylene / polypropylene / polystyrene / polyethylene terephthalate can be collected with high precision at low cost as a raw material for material recycling, and wet specific gravity sorting.・ Rough cleaning process 8
In addition, by removing foreign matter in each step of the secondary washing step 9, a recycled material having high added value can be obtained.

The mixed plastic of materials other than polyethylene / polypropylene / polystyrene / polyethylene terephthalate removes vinyl chloride which is incompatible with oil in a wet specific gravity sorting / rough washing step 8 and then oils it, thereby generating dioxin and equipment. The oil can be turned into oil without causing corrosion of the equipment, and the amount of residues to be landfilled can be reduced. As a result, the yield of waste plastic recycling can be improved.

FIG. 2 shows a material balance in the present invention, and FIG. 3 shows a material balance in a conventional configuration. As is clear from the comparison between the two, 4
Since about 0% of pellets / flakes can be recovered, the rate of material recycling is increased.

[0016]

As described above, according to the present invention, polyethylene / polypropylene / polystyrene /
By removing waste plastics of each material of polyethylene terephthalate, material recycling raw materials can be recovered with high precision and at low cost. Mixed plastics that could not be sorted are turned into oil after removing vinyl chloride, which is an incompatible oil. In this way, oil can be turned into oil without the generation of dioxins and corrosion of equipment, etc., the amount of residues to be landfilled can be reduced, and by combining a waste plastic material recycling line with an oil treatment line, waste plastic Energy consumption required for processing can be reduced, and the yield of waste plastic recycling is improved.

[Brief description of the drawings]

FIG. 1 is a flow sheet showing a recycling method according to an embodiment of the present invention.

FIG. 2 is a diagram showing a material balance in the present embodiment.

FIG. 3 is a diagram showing a material balance in a conventional configuration.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 Crushing process 2 Foreign material removal / sorting process 3 Material recycling raw material 4 Oiling raw material 5 Metals 6 Foreign material / unsuitable material 7 Crushing (fine crushing) process 8 Wet specific gravity sorting / rough cleaning process 9 Secondary washing process 10 Drying process 11 Granulation process 12 Material recycling products (pellets, flakes) 13 Magnetic sorting process 14 Aluminum sorting process 15 Irons 16 Aluminums 17 Vinyl chloride (flakes) 18 Thermal decomposition / oiling process 19 Generated oil 20 Generated gas 21 Solid fuel

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Claims (1)

[Claims] 1. A multi-mixed waste plastic received in a facility is manually and manually separated into a material recycling raw material for each material of polyethylene / polypropylene / polystyrene / polyethylene terephthalate and an oiling raw material composed of other mixed plastics, Material recycling raw materials are crushed for each material, and then wet specific gravity sorting is performed to remove foreign substances,
After that, it is granulated and made into a material recycled product, and the liquefied raw material is crushed, then magnetically separated, aluminum is separated to remove irons and aluminums, and then wet-gravity separated and dechlorinated. A hybrid plastic recycling method characterized in that it is thermally decomposed and converted to oil.