JP3088664B2 - Extruder solidification equipment for shredder dust containing plastics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to shredder dust containing plastics, which are bulky waste products such as waste automobiles and waste home appliances, which are crushed, kneaded, compressed and pulverized to reduce heat generation and drying. The present invention relates to an apparatus for extruding and solidifying shredder dust containing plastics which solidifies.

[0002]

2. Description of the Related Art Shredder dust from discarded vehicles, which emits 1.2 million tons per year, has been landfilled as stable waste in the past. The ordinance was promulgated on April 26, April 1, 1996
It will be fully implemented on the day. Shredder dust from end-of-life vehicles often contains paint, solder, oil, and lead mixed in from remaining batteries, etc., and lead is particularly abundant in organic lightweight materials such as urethane, rubber, sponge, cloth, and textile waste. It adhered in the form of a single dust, and when water such as rainwater entered, it was easily eluted as lead ions, so it was treated as a managed waste.

[0003]

In a managed landfill, a water-collecting / water treatment device is provided so that contaminated water is waterproofed so as not to penetrate into the ground and to escape to the outside. And the disposal of collected sewage, the landfill cost of managed waste, such as shredder dust from discarded vehicles, will jump about three times. However, if lead is stabilized so that it does not elute as lead ions (target value: less than 0.3 ppm) into rainwater, etc., it will be landfilled inexpensively at a new landfill site in the Phoenix project offshore Amagasaki and Osaka. Will be able to do it.

The present invention has been devised in view of the above, and is intended to reduce the volume of solidified shredder dust from waste automobiles and the like, and to reduce the amount of lead contained in urethane, rubber, sponge, cloth, fiber waste, etc. in shredder dust. Even if it adheres in dust, etc., the aqueous solution of the chelating agent is evenly mixed to stabilize lead as a water-insoluble chelating compound so that it does not elute as lead ions in rainwater, etc. Even if the water content increases, the operating speed is not reduced and the steam generated by the heat generation of the intermediate on the downstream side is exhausted sufficiently efficiently before solidification of the molten plastic to obtain a hard solid. With the aim of providing an apparatus for extruding and solidifying shredder dust containing plastics, which can further minimize the amount of chelating agent used. That.

[0005]

According to a first aspect of the present invention, there is provided an apparatus for extruding and solidifying shredder dust containing plastics, wherein the plastics introduced from an input port at one end of an elongated casing is provided. Shredding, kneading, compressing and pulverizing while conveying the shredder dust including the shredder dust in the longitudinal direction from the input port to the outlet at the other end, to reduce the volume by solidification due to heat generation and drying action of friction and compression, A rotating shaft provided in a longitudinal direction in the elongated casing, a spiral body attached to the rotating shaft, and a solidifying means provided in the outlet, and are combined with lead ions. An aqueous solution of a chelating agent is introduced into the casing via introduction means connected to a side wall near the introduction port or the introduction port of the elongated casing, and crushed by the spiral, In an apparatus for extruding and solidifying shredder dust containing plastics so as to be uniformly mixed into shredder dust undergoing kneading, compression and pulverization, the elongated casing has an exhaust means in a downstream portion, It is characterized in that it is connected to a negative pressure generating source such as a suction blower so that the water content of the aqueous solution is discharged from the exhaust means.

In the apparatus for extruding and solidifying shredder dust containing plastics according to the first aspect of the present invention, the shredder dust containing plastics introduced from an inlet at one end rotates inside the elongated casing. It is subjected to crushing, kneading, compression and pulverization by a spiral body around the axis, and is uniformly mixed and kneaded with an aqueous solution of a chelating agent introduced into the elongate casing through an introduction means connected to a side wall of the elongate casing or an inlet thereof. Even if lead is mixed in the shredder dust, the chelating agent can be combined with lead ions eluted in the aqueous solution and stabilized as a chelate compound that is not eluted in water. The shredder dust is mixed very well with the aqueous solution of the chelating agent by kneading with the spiral and pulverizing with the pressing body, so that the amount of the chelating agent used can be kept to a minimum. In addition, the elongated casing,
An exhaust means is provided on the downstream side, and the aqueous solution of the chelating agent is supplied and connected to a negative pressure generating source such as a suction blower so that the water of the aqueous solution is discharged from the exhaust means. Even if the number increases, the water is sufficiently removed without lowering the operation speed. In addition, the water contained from the beginning,
Along with the water content of the chelating agent aqueous solution, water is efficiently discharged and removed from the exhaust means attached to the downstream casing as steam generated by the heat generated by the intermediate on the downstream side.

As described above, the lead is stabilized, and the plastics in the shredder dust are melted by frictional heat and compression heat at the time of kneading, and moisture that inhibits solidification of the molten plastics is removed by evaporation. The molten plastics take in other crushed wastes and dusts and are extruded into hard solids of various shapes by solidification means provided at an outlet to be reduced in volume and solidified. The thus obtained solid material having good shape retention can prevent the elution of lead even when put into water for landfill, and can be handled almost as well as the stable type.

[0008] In the apparatus for extruding and solidifying shredder dust containing plastics according to the second aspect, the aqueous solution of the chelating agent contains a sodium dithiocarbamate as a main component at a weight ratio of about 1.0 to the shredder dust.
When 0% or more is blended and the pH is adjusted to an alkaline of 8.8 to 9.8, 0.3 p
pm.

[0009]

[0010]

[0011]

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a horizontal sectional view of a main part of an apparatus for extruding and solidifying shredder dust containing plastics according to a typical embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the apparatus for extruding and solidifying the same. 3 is a sectional view taken along the line III-III in FIG. 2, FIG. 4 is a flowchart of a shredder dust sorting process, FIG. 5 is a side view of a rotary roller separator as a pretreatment device of the extrusion solidifying device, and FIG. 6 is a plan view for explaining the intricate arrangement of the rotating rollers, FIG. 7 is a perspective view of a vibrating screen / wind separator of the succeeding apparatus of the rotating roller separator, and FIG. 8 is a side view for explaining the vibrating screen section.

Referring to FIGS. 1 to 3, an extruder for solidifying a shredder dust containing plastics according to a representative embodiment is substantially the same as an apparatus for solidifying a waste containing a polymer of Utility Model Registration No. 1761752. It has a structure, and a shredder dust lightweight material W containing plastics from a waste car which is supplied quantitatively from an input port 11a at one end of the elongated casing 11 to a longitudinal direction reaching an outlet 11c at the other end. Crushing, kneading, compressing and pulverizing while transporting to reduce the volume by solidification due to the heat generated by friction and compression and the drying action, and chelate the lead mixed into the light weight shredder dust material W so that the chelating agent does not elute the lead into water. It stabilizes as a compound. The concentration of the chelating agent aqueous solution is set so that the mixing ratio of the chelating agent to the shredder dust lightweight material W is about 1.0% or more by weight, and the pH is 8.8 to 8.8.
It is adjusted to 9.8 alkalinity so that the lead ion eluted in water is less than 0.3 ppm. Of course, the extruder solidifying device 10 can be configured not only to use the shredder dust lightweight material W alone but also to supply the entire shredder dust, and can also handle shredder dust from waste household appliances and the like. I can do it.

The extruding solidifying device 10 is mounted on a pair of rotating shafts 12 and 13 which are arranged in the elongated casing 11 in the longitudinal direction and are driven to rotate in opposite directions. Spirals 14, 14 ', 17, 1
7 ′ and pressed bodies 16, 16 ′, and pressed bodies 16, 16 ′
Exhaust means Q attached to the upper part of the casing 11 in the vicinity of the downstream side, a wear-resistant lining member 30 provided in the casing 11 with a predetermined gap from the spiral body and the compressed body, and the inlet 11a And a perforated plate 20 of a solidifying means attached to the outlet 11c. The introduction means 50 may be provided on a peripheral wall of the casing 11 near the inlet 11a. The means for introducing an aqueous solution of a chelating agent 50 is connected to a main pipe 51 to which an aqueous solution of a chelating agent is supplied from a tank by a pump, and
1a and a plurality of nozzles 53 projecting into the inlet 11a from the loop pipe 52, and a chelating agent aqueous solution is discharged from the nozzle 53 into the shredder dust lightweight material W. It can be spray-mixed uniformly.

A pair of adjacent sides juxtaposed via bearings A and B in the longitudinal direction of the elongated casing 11 installed in the horizontal direction and having a substantially elliptical cross-section so as to bite from top to bottom. In FIG. 1, each of the rotating shafts 12 and 13 which are driven to rotate in opposite directions (from the front surface to the back surface in FIG. 1) has a polygonal shape such as a regular hexagon or a spectacle shape from the inlet to the outlet. The first helical body 14 14 ′ and the first sloping blades 15, 15 ′ (which can be appropriately removed in accordance with the fluidity of the intermediate) in a driven state by an engagement means having an engagement surface having a cross section of And the first pressed body 16 16 ′ and the second pressed body 16 16 ′
The spirals 17 17 ′ are sequentially provided. The first spiral body 14 14 ′ is about twice as long as the second spiral body 17 17 ′ in order to sufficiently perform crushing and kneading at first. Each of the spirals 14, 14 ', 17, 17' is
A cylindrical body 14a17a engaged with the cylindrical bodies 2 and 13;
spiral blades 1 of the opposed spiral bodies 14, 14 ', 17, 17' including right-handed and left-handed spiral blades 14b, 14b ', 17b, 17b' formed on the outer peripheral surfaces of the a and 17a.
4b, 14b ', 17b, 17b' are arranged so as to mesh with each other.

The first sloping blades 15, 15 'are string-shaped,
The right bevel blade 15 which is selectively attached as appropriate when there are many fibrous lightweight objects and has the same shape on each of the rotating shafts 12 and 13 and meshes with the rotating direction.
a and the left sloping blade 15a 'are circumferentially provided at equal intervals in a plurality (for example, four). Pressed bodies 16, 16 '
Each of the rotating shafts 12 and 13 has substantially the same shape and is composed of upstream frustoconical portions 16a and 16a 'and downstream cylindrical portions 16b and 16b'. On the outer peripheral surface of the truncated cone-shaped portion and the cylindrical portion, a plurality of (for example, four) inclined grooves 16c and a left inclined groove 16c 'are engraved on the outer peripheral surface thereof at equal intervals in each circumferential direction. ing.

The spiral blades 14b, 14b ', 17b, 17
The gap c between the b ', the beveled blades 15a, 15a' and the squeezing body 16 16 'and the lining 30 attached to the inner surface of the casing 11 is such that the shredder dust lightweight material W can be crushed, compressed and crushed. The light-weight material W is uniformly mixed with the aqueous solution of the chelating agent, is pressurized and generates heat, whereby the plastics is melted and water is evaporated. This gap c is formed by the cassette type lining 3 of various thicknesses.
By appropriately replacing 0, it can be changed arbitrarily, whereby appropriate adjustment of compression, pressurization and the like can be performed in accordance with the composition change of shredder dust, and a hard solid can be obtained. As shown in FIG. 3, the cassette type lining 30 is divided into a plurality of parts, and is fixedly mounted on the casing 11 so as to be replaceable by wedges 31.

The casing 11 includes a first spiral body 141.
The first block 1B containing the 4 'and the first pressed body 16
A second block 2B accommodating the second spiral 16
And a third block 3B accommodating 17 '. The first block 1B is connected to a front wall 110 via a front flange and a third block 3B. 3B is connected to the guide plate 20a via a rear flange by bolts and nuts. Each block 1B, 2B, 3B is
Further, the casing 11 is formed of an upper section and a lower section which are joined to each other by a bolt and a nut via a horizontal flange so that the casing 11 can be vertically divided into two parts at the center, but the configuration of the casing 11 is not limited to this. Not something.

The upper section of the first block has an inlet 11
a is also the front top of the upper section of the third block (first
A steam exhaust pipe Q is provided in the compressed body 16 16 ′ (position near the downstream side). On the other hand, in the solid material taking-out portion, the guide plate 20a has a large number of circular, cross-shaped, and other various shapes such as a triangular shape and a quadrangular shape as required in a surface area corresponding to the outer peripheral portion of the cylindrical body 17a. The holes 22a are arranged. The through holes 22... Of the perforated plate 20 attached to the outside of the guide plate 20a by co-tightening are formed in a shape corresponding to the through holes 22a and are tapered with a narrowing diameter in the forward direction. May be something. The steam exhaust pipe Q may be of the open-to-atmosphere type, but may be configured to be connected to a negative pressure source such as a suction blower to actively remove moisture.

One rotating shaft 12 is driven to rotate counterclockwise (indicated by an arrow a) as viewed from the upstream side with a large torque through a speed reducer by a motor (not shown). The other rotating shaft 13 is driven to rotate clockwise (indicated by an arrow b) at a constant speed in the gear box GB via the gears 19a and 19b fixed to the ends. A thrust bearing which receives a conveying force or a reaction force of a press input is also provided as appropriate. Each rotating shaft is supported in a cantilever manner by a bearing A of the gear box GB and a bearing B at the upstream end of the casing 11. In order to facilitate replacement of a spiral, a beveled wheel and a squeezed body which are subject to high load and severe wear, these components are provided with a rotating shaft 12,
13 are sequentially inserted from the small-diameter downstream side to the large-diameter collar portions 12a and 13a on the upstream side so that the 13 can be pulled out to the upstream side. As the extruding solidifying device, it is natural that various extruding solidifying devices such as those having a uniaxial tapered spiral body are used in addition to the above-described representative embodiment.

Since lead, which is easily dissolved in water, adheres to lightweight objects including dusts such as urethane, rubber, sponge, cloth, and fiber waste in the form of fine metal dust, the amount of chelating agent used is small. It is necessary to extrude as much as possible and to extrude only the light-weight material W into the solidifying device 10 in order to suppress the minimum amount of water. In order to perform this sorting, a rotary roller type separator 60 and a vibrating sieve / wind separator 70 are provided as a pretreatment device of the extrusion solidifying device 10 according to a flowchart shown in FIG.

The rotary roller type separator 60 sorts the shredder dust W0 into three types: a sieve-passing object W1, a light-weight object W2 conveyed to the upper end, and a falling heavy object W3 to the lower end. And as shown in FIG.
A and a plurality of rotating rollers 61 in which the small-diameter annular bodies 61B are alternately arranged in the axial direction are formed on the inclined frame 60A by separating the large-diameter annular bodies 61A and the small-diameter annular bodies 61B of the adjacent rotors with a sieve mesh space G therebetween. Are arranged. Each rotor 61 is rotated by a rotation drive device (not shown) so as to feed the shredder dust W0 of the processing object supplied from above the intermediate portion upward so that the non-repulsive lightweight material W2 is moved upward. , The repulsive heavy object W3 is dropped down, and the mixed small workpiece W1 is moved to the large-diameter ring 61A and the small-diameter ring 61 of the roller 61.
It is dropped from the sieve G between B and sorted. Lightweight object W2
Is sent to the extrusion solidifying device 10 by a conveyor or the like,
The passed-through sieve W1 is further sorted by the next vibrating sieve / wind sorter 70.

The separator 60 is opened at the bottom, and a supply opening 63A for the shredder dust W0 is formed on the upper surface of the middle part.
A housing 6 having an opening 63B for taking out the lightweight article W2 at the upper end and an opening 63C for taking out the heavy article W3 at the lower end.
3 and dust and soundproofing are taken. Air ejecting means 63D for supplying the rising air flow A1 on the upper surface of the rotor is provided above the vicinity of the heavy object take-out opening 63C of the housing 63, and the rising air flow A1 blowing from the lower end of the housing 63 is provided. Thereby, the release of the lump of the mixed shredder dust W0 is promoted, and the upward transport of the lightweight article W2 is promoted.

The roller 61 has a large-diameter annular body 61A and a small-diameter annular body 61B of a spacing piece alternately fitted and arranged in an axial direction on a hexagonal shaft to which a gear forming a rotary driving device is fixed at one end. The large-diameter annular body 61A has a projection 61a formed on a side surface, and has an uneven outer peripheral surface so as to generate an airflow that is floated and conveyed to prevent winding of a tape or a string. The large-diameter wheel 61A and the small-diameter wheel 61B may be formed as an integral body,
The small-diameter ring body 61B can be substituted with a rotating shaft. The rotation drive device is configured to interpose an idle gear between gears with a roller shaft and to rotate the gear so as to apply a feed in an obliquely upward direction. The rotation drive device can adopt a chain type instead of a gear type. Further, the shape of the large-diameter ring body 31A can take various shapes other than the above. The inclination angle of the separator 60 is adjusted by the expansion / contraction means 65 for each frame 60A.

As shown in FIG. 7 and FIG. 8, the vibrating sieve / wind separator 70 for sorting the passing-through material W1 from the rotary roller separator 60 has different sizes and weights mixed. The small sieve passing material W1 is supplied from above, and the vibrating sieve part 7 includes three types of sieves G1 to G3 in order from the small sieve.
1 and the sieve passing products W71 to W
73 is a duct rising part 81, 8 of the wind separation part 80
Send to 2,83. Duct rising portions 81, 82, 83
Each of the ducts 85 has a vertical lower end 86 so as to receive the supply of the sieve passing substances W71 to W73 and drop the heavy substances H1 to H3.
Is open, and the upper end is connected to a cyclone separator 88 of a lightweight separator by a connecting pipe 87. Although only one set is shown in FIG. 7 and other illustrations are omitted, the lightweight objects L1 to L3 are taken out from each lightweight object separator 88 via a seal valve 88A. The upper end 89 of the light-weight separator 88 on the suction side is connected to an air inhaler (not shown). The rising duct 85 can be installed not only vertically but also in an inclined state.

The jumping screen 71 of the vibrating sieve
3 types of sieve G made by HEIN, LEHMANN, Germany
A plurality of tough special synthetic rubber nets 71A having moderate elasticity and having a large number of holes 1 to G3 are sectioned in the longitudinal direction.
Side plates 72A, 73A (each supporting spring 7) which reciprocate in the opposite direction with every other cross beam 72, 73 fixed to
2B, 73B), and the section where the cross beams 72, 73 are close to each other is deformed downward to receive the workpiece W1, and then the cross beams 72, 73 are separated from each other. The sieve sorting is performed while repeating the operation of flipping the object to be processed which has been pulled and received, and does not cause clogging of the sieve even if the object to be processed W1 is wet. The reciprocating motion of the side plates 72A, 73A is performed by shifting the phase of the motor output shaft 74 by 180 degrees to connect the coupling springs 72C, 73C.
It is obtained by connecting with. Since the object to be processed is periodically jumped, the screening efficiency is high, the structure is simple, maintenance and inspection are easy, and the power consumption is small.

The vibratory feeder 79 of the conveying means uses a vibrator which can easily and widely adjust the conveying amount by an inverter control, and continuously passes through the sieve passing materials W71 to W73 by a fixed amount at the duct rising portion. Send to 81-83. Using a roots blower or the like having a large air volume as an air inhaler, a constant lightweight negative pressure for separating materials is generated in the duct rising portions 81 to 83, and this constant constant negative pressure is maintained by a constant supply. The air inhaler exhausts through the back filter.

Thus, the heavy objects H1 to H3 fall through the respective sieves depending on the flow velocity of the air flow sucked from the open lower end 86 thereof, whether vertical or inclined in the rising duct 85, The light objects L1 to L3 are conveyed to the light object separator 88 by the air flow. Here, the workpiece W
No. 1 is classified into lightweight materials L1 to L3, which are overwhelmingly flammable organic materials, and heavy materials H1 to H3, which are overwhelmingly incombustible inorganic materials. It goes without saying that changing the air flow rate can change the branch point between the light and heavy objects. By frequent sorting in this way, it is possible to reduce the amount of chelating agent used by sorting out heavy objects. In the above embodiment, the light weight shredder dust material W supplied to the extrusion solidifying device 10 includes the light weight material W2 from the rotating roller separator 60 and the light weight materials L1 to L3 from the vibrating screen / wind separator 70.

[0029]

【Example】

<Results of sorting waste car shredder dust using a rotating roller separator> (1) Input amount of mix W0 without engine: 277K
g, lightweight material W2: 125Kg, sieve passing material W1: 11
3Kg, heavy weight W3: 19Kg, spill: 20K
g (2) Input amount of mix W0 with engine: 224K
g, lightweight material W2: 120 Kg, sieve passing material W1: 68
Kg, heavy material W3: 12 Kg, spill: 24 Kg <Results of screening of sieved product W1 by vibrating sieve / wind separator> (1) Input amount of sieved product W1 of mix removed from engine:
113Kg, 15 mesh or more lightweight L1: 21Kg
And heavy material H1: 4.5 kg, 15 to 6 mesh lightweight material L2: 12 kg and heavy material H2: 13.5 kg, 6 mesh or less lightweight material L3: 14 kg and heavy material H3: 34.4
Kg, spills: 13.6 kg (2) Input amount of W1 that has passed through the sieve of the engine-equipped mix:
68Kg, 15 mesh or more lightweight material L1: 11.5K
g and weight H1: 6 kg, 15-6 mesh lightweight L
2: 7.5 Kg and heavy substance H2: 10 Kg, 6 mesh or less lightweight L3: 7 Kg and heavy substance H3: 16.5 Kg,
Scattering spill: 9.6 Kg * Weight saving ratio of light weight materials input to the extrusion solidification device (1) Light weight material of the mix removed from the engine W = W2 + L1
L3 = 172 Kg Saving rate = W / W0 = 172/277 = 62% (2) Light weight mix with engine W = W2 + L1
L3 = 146Kg Saving rate = W / W0 = 146/224 = 65.2%

<Results of Treatment of Waste Automobile Shredder Dust with Chelating Agent> Test after shredder dust was solidified by an extrusion solidification device Solid (Pb: 590 mg / kg contained) Elution amount without addition of chelating agent: 2 1.6 mg / l (ppm) | Pb of sample 1 | | Weight blending ratio of Sumitomo Chemical AC-20N | Elution amount mg / l | pH | 1%: 1.9 7.3 2%: 0.95 8.3 2.5%: 0.23 8.8 | Pb of sample 2 | | Weight blending ratio of Sumitomo Chemical AC-20N | Elution amount mg / l | pH | 1%: 1.3 8.6 2%: 49 9.0 2.5%: 0.03 9.3 * Pb elution amount is 0.23-0. Reduced to 03mg / l (ppm)

<Results of Treatment of Lightweight Waste Shredder Dust with Chelating Agent> Test Shredder Dust Light after Sorting by Lightweight Roller Type Separator (Pb content not measured) | Pb elution amount mg / l Sampling difference of lightweight material: Sample 1, Sample 2, Sample 3 When no chelating agent is added: 7.8 3.2 4.9 pH: 7.3 7.4 7.4 AC-20N blending ratio 1%: 1. 9 2.1 1.4 pH: 7.6 7.8 7.8 AC-20N blending ratio 2%: 1.2 1.7 3.5 pH: 8.0 8.5 7.9 AC-11 blending Ratio 1%: 2.1 3.1 5.8 pH: 9.6 9.2 10.3 AC-11 Compounding ratio 2%: 0.22 0.91 0.12 pH: 9.8 10.29 .2 * AC-11 is 2% compounding ratio Also, when the pH was adjusted to 9.2 to 9.8, the elution amount of Pb could be reduced to 0.12 to 0.22 mg / l (ppm). Good results are not obtained when the pH exceeds 10.

[0032]

As is apparent from the above description, according to the apparatus for extruding and solidifying shredder dust containing plastics according to the first aspect of the present invention, the apparatus includes plastics introduced from the inlet at one end. The shredder dust undergoes crushing, kneading, compression and crushing by a spiral body around the rotation axis in the lining inside the elongated casing, and the inside of the elongated casing is introduced through an introduction pipe connected to a side wall of the elongated casing or an inlet thereof. The chelating agent is uniformly mixed with the aqueous solution of the chelating agent introduced into the shredder dust, and even if lead is mixed in the shredder dust, the chelating agent can be combined with lead ions eluted in the aqueous solution and stabilized. it can. Further, the shredder dust can be mixed very well with the aqueous solution of the chelating agent by kneading and pulverizing with a spiral, so that the amount of the chelating agent used can be kept to a minimum. In addition, the elongated casing has an exhaust means on the downstream side, and is connected to a negative pressure generating source such as a suction blower so that the water of the aqueous solution is discharged from the exhaust means. Even if the aqueous solution is supplied and the amount of water increases, the water is sufficiently removed without reducing the operation speed. Further, the moisture contained from the beginning is also efficiently discharged and removed together with the moisture of the chelating agent aqueous solution from the exhaust means attached to the downstream casing as steam generated by the heat generated by the intermediate on the downstream side.

As described above, while stabilizing the lead, the plastics in the shredder dust are melted by the frictional heat and the compression heat of the kneading, and the moisture is removed by evaporation. The molten plastics takes in other crushed waste and dust, and is reduced in volume and solidified into hard solids of various shapes by solidifying means provided in an outlet. The thus obtained solid material having good shape retention can prevent the elution of lead even when put into water for landfill, and can be handled almost as well as the stable type.

According to the apparatus for extruding and solidifying shredder dust containing plastics according to the second aspect, the aqueous solution of the chelating agent contains the chelating agent containing sodium dicarbamate as a main component in a weight ratio to the shredder dust. It contains 1.0% or more and has been adjusted to an alkaline pH of 8.8 to 9.8. Therefore, even if there is some variation in the content of lead, water-leached lead ions can be reduced to 0.3 ppm or less. Can be reduced.

[0035]

[0036]

[0037]

[Brief description of the drawings]

FIG. 1 is a main part horizontal sectional view of an apparatus for extruding and solidifying shredder dust containing plastics according to a representative embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the extrusion solidifying apparatus.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a flowchart of a shredder dust sorting process.

FIG. 5 is a side view of a rotating roller separator as a pretreatment device of the extrusion solidification device.

FIG. 6 is a plan view for explaining an intricate arrangement of rotating rollers.

FIG. 7 is a perspective view of a vibrating sieve / wind sorting device of a succeeding device of the rotary roller sorting device.

FIG. 8 is an explanatory side view of a vibrating sieve section of the vibrating sieve / wind separation device.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 10 Extruding and solidifying device for shredder dust containing plastics 11 Slender casing 11a Input port 11c take-out port 12, 13 Rotating shaft 14, 14 'Spiral 17, 17' Spiral 20 Solidifying means 50 Introducing means 60 Rotating roller separator 70 Vibrating sieve / wind separator 71 Vibrating sieve 80 Wind separator Q Exhaust means W Shredder dust (light) W1 Small and medium passing material W2 Light material L1-L3 Light material

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-141548 (JP, A) JP-A-62-221484 (JP, A) JP-A-8-10743 (JP, A) JP-A-6-221484 63530 (JP, A) JP-A-4-73108 (JP, A) JP-A-8-117730 (JP, A) JP-A 8-155422 (JP, A) JP-A-63-12389 (JP, A) JP-A-9-234593 (JP, A) JP-A-10-58451 (JP, A) JP-A-7-60219 (JP, A) JP-A-7-60220 (JP, A) JP-A-8-1138 (JP, A) JP 5-76896 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B09B 3/00-5/00 B29B 17/00-17/02 C08J 11 / 00-11/02

Claims (2)

(57) [Claims] 1. Shredding, kneading, compressing and pulverizing while shredder dust containing plastics supplied from an input port at one end of an elongated casing is transported in a longitudinal direction from the input port to an output port at the other end. And a rotating shaft provided in the longitudinal direction in the elongated casing, wherein the volume is reduced and solidified by the heat generated by the friction and compression and the drying action.
A helical body attached to the rotating shaft, and a solidifying means provided in the outlet, wherein an aqueous solution of a chelating agent that combines with lead ions is supplied to the inlet or the inlet of the elongated casing. Extrusion of shredder dust containing plastics that is introduced into the casing via the introduction means connected to the near side wall and is uniformly mixed with the shredder dust that has been subjected to crushing, kneading, compression and pulverization by the spiral body. In the solidifying device, the elongated casing has an exhaust unit in a downstream portion, and is connected to a negative pressure generating source such as a suction blower so that the water of the aqueous solution is discharged from the exhaust unit. A device for extruding and solidifying shredder dust containing plastics. 2. The aqueous solution of the chelating agent contains a chelating agent containing sodium dithiocarbamate as a main component at a weight ratio of about 1.0% or more based on the shredder dust, and has a pH of 8.8 to 9.8. An apparatus for extruding and solidifying shredder dust containing the plastics according to claim 1, which is prepared to be alkaline.