JP3050840B2 - Construction mixed waste sorting method and system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a system for sorting construction mixed waste in which combustibles and non-combustibles are mixed for recycling or landfill.

[0002]

2. Description of the Related Art Conventionally, this kind of construction mixed waste is sorted by hand sorting, magnetic force sorting, crushing and the like, and finally a general sieve or a trommel (rotating sieve) having a sieve opening of about 30 mm. The final disposal of the sieved product has been carried out.

[0003]

In the conventional method and system for separating construction mixed waste, the construction mixed waste is piled up in some cases and may be wet, and paper or vinyl contained therein may be wet. In order to prevent clogging of the sieve with sheets, the minimum aperture is about 30 mm. Since such sieved products contain 10% by weight or more of combustibles therein, they can only be landfilled at a controlled final disposal site, and the amount of landfill disposal is increasing. Accordingly, an object of the present invention is to provide a method and a system for sorting construction mixed waste, which can reduce the amount of landfill disposal and increase the amount of recycling.

[0004]

In order to solve the above-mentioned problems, a first method of sorting construction mixed waste according to the present invention is as follows.
30m while transporting construction mixed waste with a particle size range of 0mm or less from the middle part upward while flipping on the inclined sieve surface
sieved product with a particle size range of 100 m or less, 30 mm or less
Drops on a sieve with a particle size range exceeding
After sieving to a sieve product exceeding 30 mm, the sieved product having a particle size range of 5 to 20 mm is transferred while transferring the sieved product having a particle size range of 30 mm or less from the upper side to the lower side in the inclined cylindrical rotating screen. And 30 mm at the discharge end of the rotating sieve surface.
It is characterized by classifying the on-screen product having a size of m or more and 5 mm or more into light and heavy products. Further, the second method for sorting construction mixed waste is the same as the first method, wherein
After classifying the falling objects on the sieve having a particle size range of more than 0 mm into light and heavy materials, and crushing the heavy materials so that the brittle ones in them have a particle size range of 20 mm or less, the crushed products are reduced to 20 mm or less and 100 mm or less. It is characterized in that it is sieved to a particle size range exceeding 20 mm. On the other hand, in the first construction mixed waste sorting system of the present invention, a large number of rotating shafts are attached at equal intervals to a sieve frame arranged at an angle so that the opening of each mesh is 30 mm. A large number of star-shaped impellers made of a flexible material are attached so that the side surfaces of the tips of adjacent rotary shafts are in sliding contact with each other. A screen for sieving the product to be sieved, dropped on the screen, and sieved product while transferring upward from the part, and a large number of through holes are formed on the peripheral wall at the discharge end of the cylindrical cylindrical trommel having a sieve opening of 5 to 20 mm. The sorting cylinder having a screen, a suction nozzle is arranged inside the sorting cylinder so as to face the inner peripheral surface, and a blowing nozzle for blowing air toward the suction nozzle outside the sorting cylinder is arranged. Transfer the sieved product from top to bottom Sieved to undersize product and oversize product, and characterized in that it comprises a trommel with a suction nozzle for classifying the weight thereof and the weight was sieved product at the discharge end. Further, the second construction mixed waste sorting system is the same as the first system, except that a wind separation device for classifying the screen falling material on the screen into a light-weight material and a heavy material, and a classifying heavy material therein. It is characterized by comprising a crusher for crushing a brittle substance so that the particle size is within 20 mm or less, and a sieve having a sieve opening of 20 mm for sifting the broken product.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 are flowcharts showing an example of an embodiment of a method and a system for sorting construction mixed waste according to the present invention. Construction mixed waste A previously crushed or sorted by a twin-screw crusher or the like (not shown) so as to have a particle size range of 100 mm or less.
First, is fed into the feeding hopper 1, is cut out by a required amount from the bottom thereof by the belt feeder 2, and is supplied to the intermediate portion of the screen 4 via the steep conveyor 3. The screen 4 has a rotating shaft 4b (see FIG. 4) which is driven to rotate via a motor or the like (not shown) on a rectangular sieve frame 4a which is disposed so as to be inclined (30 to 45 °) so that the discharge end is raised. 3) are installed at equal intervals, and each rotating shaft 4
b, a large number of star-shaped impellers 4c made of a flexible material such as plastic are attached so that the opening of the sieve is 30 mm, and the adjacent rotating shafts 4b are capable of self-cleaning. Are formed so that the side surfaces of the distal end portions thereof are in sliding contact with each other. The construction mixed waste A supplied to the intermediate portion of the screen 4 is sifted on the sieve surface and is transferred upward while being sifted on the screen, and the sieved product B having a particle size range of 30 mm or less, and rolling of a particle size range exceeding 100 mm or more than 30 mm. It can be sieved into easy-to-be-sieved falling objects C and sieved products D having a particle size range of 100 mm to 30 mm. The sieved product D composed of waste plastic, wood, paper, fiber, etc. is RDF (Refuse Derivative).
d Fuel; waste is stored in the stock yard 5 for recycling as combustibles for use as compression-molded solid fuel). At the time of the above-mentioned sieving, the construction mixed waste A is transported while being lifted up and unraveled, and the sieve opening (30
mm), and sheets such as paper and plastic which cause clogging at the subsequent sieving are effectively sieved.

[0006] Next, the sieved product B of the screen 4 is supplied to a trommel 7 with a suction nozzle via a transport machine such as a belt conveyor 6a and a steeply inclined conveyor 6b. This trommel 7 with a suction nozzle has a large number of through-holes (not shown) at the discharge end of a roller-supported cylindrical trommel 7a that is inclined so that the opening of the sieve is 5 to 20 mm and the discharge end is low. A selection nozzle 7c is provided in series, and a suction nozzle 7c for sucking air is disposed inside the selection cylinder 7b so as to face the inner peripheral surface,
Further, a blowout nozzle 7d for blowing air toward the suction nozzle 7c is provided outside the sorting cylinder 7b, and the suction nozzle 7c is connected to the suction side of the bag filter 9 via the duct 8, and The blow nozzle 7 d is connected to the discharge side of an air blower 10 mounted on the back filter 9 via a duct 11. Then, the sieved product B supplied to the trommel 7 with the suction nozzle is transported from the upper side to the lower side in the rotating sieve surface of the cylindrical trommel 7a by 5 to 20 mm.
The sieved product E having the following particle size range and the sieved product F having a particle size range of 30 mm or less and exceeding 5 mm are sieved, and the sieved product F is classified into the light-weight material G and the heavy-weight material H in the sorting cylinder 7b. The sieved product E is stored in the stock yard 12 as landfill waste or recycled backfill material for construction, and is composed of waste plastic, wood, paper, fiber, and the like. Lightweight G
Is stored in a closed-type stock yard 13 attached to the lower end of the bag filter 9 for recycling as combustible material for RDF and the like, and is 30 m made of crushed stone or sand.
The weight H having a particle size range of not more than m and exceeding 5 mm is stored in the stock yard 14 for recycling as recycled aggregate for construction. At the time of the above-mentioned sieving, sheets which cause clogging of the cylindrical trommel 7a have been removed from the under-sieved product B of the screen 4, and sieving is performed with high efficiency. In addition, waste plastics, trees, etc. are included in the sieved product E.
The particle size is less than about mm, and there are few of them, and the heavy material H excludes dust and light-weight material G, and all have high sorting accuracy.

[0007] The falling object C on the screen of the screen 4 is classified into a light object I and a heavy object J by a wind separation device 15 disposed on the side of the falling path, and is made of waste plastic, wood, paper. , Fibers and the like are stored in the stock yard 5 via a belt conveyor 16 for recycling as combustibles. On the other hand, the heavy material J is supplied to the impact crusher 18 via the belt conveyor 17, and the heavy material J is crushed so that the brittle material therein has a particle size range of 20 mm or less. After being crushed, the crushed product K is a vibrating sieve 1 having a sieve opening of 20 mm.
9 and a sieved product M having a particle size range of 20 mm or less and a sieved product M having a particle size range of 100 mm or less and 20 mm or more.
The sieved product L made of crushed stone and the like is stored in a stock yard 21 via a belt conveyor 20 for recycling as recycled aggregate for construction, and is less likely to have a particle size of 20 mm or less. The sieved product M made of waste plastic, wood, etc. is stored in a stock yard 23 via a belt conveyor 22 for recycling as combustibles. The object C falling on the screen of the screen 4
Classifier into light weight I and heavy weight J
The method is not limited to the case where 5 is used, but a wet sorter (not shown) may be used, or both may be used in combination.

[0008] Here, the construction mixed waste A crushed to a particle size range of 100 mm or less having the composition shown in Table 1 is sieved using a screen 4 having a sieve opening of 30 mm and an inclination angle of 40 °. B is a sieve opening 5 mm, 10 mm,
When sieved using a trommel 7 with a suction nozzle of 20 mm, the quality of the sieved product E and the ratio of the sieved product E to the whole are shown in Table 2 which also shows the conventional one using a vibrating sieve having a mesh opening of 30 mm. It became so. In addition, it is not practical to make the opening of the screen of the trommel 7 with a suction nozzle less than 5 mm, and it is not economical to make the opening of the screen exceeding 20 mm because the product B under sieve is 30 mm. Not practical.

[0009]

[Table 1]

[0010]

[Table 2]

From Tables 1 and 2, the sieved product E was obtained by sieving construction mixed waste having a particle size range of 30 mm or less using a trommel with a suction nozzle having a mesh opening of 5 to 20 mm.
The amount of combustibles therein is 5.5 to 8.2% by weight, which can be used not only as waste for landfill disposal but also as backfill material for construction. /
It can be seen that it can be reduced to about 2. In addition, the appearance of combustibles in the sieved product E is smaller than that of non-combustibles,
The amount was evident at the boundary of 10% by weight, which was much less than that of the vibrating sieve.

In the above-described embodiment, a case has been described in which the fallen material C on the screen 4 of the screen 4 is subjected to classification, crushing, and sieving to be further sorted. However, the present invention is not limited to this. In the case where the amount of the falling object C on the sieve is small, it may be treated as waste for landfill disposal without performing the above sorting. When a metal is mixed, a metal separator such as a magnetic separator or an aluminum separator may be additionally provided for processing.

[0013]

As described above, according to the first method for sorting construction mixed waste and the system therefor according to the first aspect of the present invention, the sheets which cause clogging during the second-stage sieving by the first-stage sieving are used. Can be effectively sieved, so that the subsequent sieving can be performed with high efficiency and the opening of the latter sieving is smaller than the minimum particle size of waste plastic, wood, etc. Therefore, the sorting accuracy of each product can be improved, and the amount of downstream sieved products that are recycled as landfill or construction backfill material is significantly reduced, and the amount of recycling is significantly increased relatively. be able to. Further, according to the second method for sorting construction waste and the system therefor, in addition to the operation and effect of the first method and the system therefor, the material dropped on the previous stage is further sorted out, so that the recycling amount is further increased. can do.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an example of an embodiment of a method for sorting construction mixed waste according to the present invention.

FIG. 2 is a flowchart showing an example of an embodiment of a construction mixed waste sorting system according to the present invention.

FIG. 3 is a side view of a main part of a screen in the sorting system of FIG.

[Explanation of symbols]

 Reference Signs List 4 screen 4a Sieve frame 4b Rotating shaft 4c Impeller 7 Trommel with suction nozzle 7a Cylindrical trommel 7b Sorting cylinder 7c Suction nozzle 7d Blow-out nozzle 15 Wind separator 18 Shock crusher 19 Vibrating sieve A Construction mixed waste B Under sieve product C Drops on the screen D Products on the screen E Products on the screen F Products on the screen G Light weights H Heavy weights I Light weights J Heavy weights K Crushed products L Screened products M Screened products

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kunio Toyomaki 1780 Kamikono, Yachiyo-shi, Chiba Kawasaki Heavy Industries, Ltd. Yachiyo Plant (72) Inventor Shuji Yamamuro 2-4-1 Hamamatsucho, Minato-ku, Tokyo Kawasaki (56) References JP-A-9-234449 (JP, A) JP-A-7-256209 (JP, A) JP-A-56-108512 (JP, A) (58) Fields studied (Int .Cl. ⁷ , DB name) B07B 1/00-15/00

Claims (4)

(57) [Claims] 1. A sieved product having a particle size range of 30 mm or less while transporting construction mixed waste having a particle size range of 100 mm or less upward from an intermediate portion while flipping on an inclined sieve surface.
After sieving the on-screen product having a particle size range of 0 mm or less and a particle size range of more than 30 mm and the sieving product of a particle size range of 100 mm or less and 30 mm or less, the sieved product having a particle size range of 30 mm or less is sieved in the inclined cylindrical rotary sieve. While transferring from top to bottom 5
The sieved product having a particle size range of ２０20 mm or less and the sieved product having a particle size range of 30 mm or less and 5 mm or more are sieved, and the sieved product having a size of 30 mm or less and 5 mm or more at the discharge end of the rotating sieve surface is light and heavy. A method for sorting construction mixed waste, characterized in that the waste is classified into two types. 2. After classifying the falling object on the sieve having a particle size range of 100 mm or less and 30 mm or more into a light material and a heavy material, and crushing the heavy material so that the brittle material therein has a particle size range of 20 mm or less, 2. The method according to claim 1, wherein the crushed product is sieved into a particle size range of 20 mm or less and 100 mm or less and more than 20 mm. 3. A large number of rotating shafts are attached at equal intervals to a sieve frame which is disposed at an angle, and the opening of each mesh is 30 mm.
A large number of star-shaped impellers made of a flexible material are attached so that the side surfaces of the tips of adjacent rotary shafts are in sliding contact with each other, and construction mixed waste having a particle size range of 100 mm or less. A screen for sifting into a sifted product, a sifted product and a sifted product while being transported upward from the middle part while flipping up the sifted product, and a large number of transparent materials are provided at the discharge end of the inclined cylindrical trommel having a mesh opening of 5 to 20 mm. A sorting cylinder having a hole in the peripheral wall is provided in series, a suction nozzle is arranged inside the sorting cylinder so as to face the inner peripheral surface, and a blowing nozzle for blowing air toward the suction nozzle is arranged outside the sorting cylinder. Equipped with a trommel with a suction nozzle for sieving the sieved product and the sieved product while transferring the sieved product of the screen from the top to the bottom, and classifying the sieved product into lightweight and heavy products at the discharge end. Construction mixed characterized by Wastes of the sorting system. 4. A wind separator for classifying the screen-fall material on the screen into a light-weight material and a heavy-weight material, and a crushing device for crushing the classified heavy-weight material so that the fragile material therein has a particle size range of 20 mm or less. Machine and the opening of the sieve for sifting the crushed product is 2
The construction mixed waste sorting system according to claim 3, further comprising a 0 mm sieve.