JP2001062333A - Method and apparatus for separating and recovering polyethylene resin and vinyl chloride resin from nugget refuse - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and effectively separate and recover a polyethylene resin and a vinyl chloride resin from a mixture of both resins called as nugget refuse. SOLUTION: Water is stored in a cylindrical rotary body 2 like a kiln and nugget refuse 100 is fed in this water. The polyethylene resin crushed matter 101 floating on the surface of the water is allowed to flow out of the cylindrical rotary body along with water from the inlet side of the cylindrical rotary body to be recovered. The polyvinyl chloride crushed matter 102 sedimented on the bottom part of the cylindrical rotary body is allowed to flow out of the cylindrical rotary body along with water from the outlet side of the cylindrical rotary body by the spiral means 20 provided to the inner wall surface of the cylindrical rotary body to be recovered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for separating and recovering polyethylene resin and vinyl chloride resin from a mixture of polyethylene resin and vinyl chloride resin, which is called nugget waste.

[0002]

2. Description of the Related Art After being used, a copper wire used for wiring of a switchboard or the like is crushed and separated into a core and a jacket by specific gravity sorting, and the core is reused as a copper material. The jacket is pulverized after being separated from the core, turned into nugget waste, which is a mixture of polyethylene resin and vinyl chloride resin, and discarded or incinerated.

[0003]

However, disposal or incineration of nugget waste, which is a mixture of a polyethylene resin and a vinyl chloride resin, has environmental problems. It is desirable that such polyethylene resin and vinyl chloride resin be collected and reused.

Accordingly, it is an object of the present invention to provide a method for separating and recovering polyethylene resin and vinyl chloride resin easily and effectively from a mixture of polyethylene resin and vinyl chloride resin called nugget waste. And an apparatus.

[0005]

The above object is achieved by a method and apparatus for separating and recovering polyethylene resin and vinyl chloride resin from nugget waste according to the present invention. In summary, according to one embodiment of the present invention, (a) a cylindrical rotating body having an inlet and an outlet at both ends in the longitudinal axis direction and having a spiral means formed on an inner wall surface is inclined so that the inlet side is lowered. (B) rotating around the longitudinal axis and providing a weir on the inlet side so that water can be stored in the cylindrical rotating body.
Nugget waste consisting of a mixture of the crushed polyethylene resin and the crushed vinyl chloride resin is charged into the cylindrical rotator from the inlet side of the cylindrical rotating body, and the polyethylene resin crushed material floats on the water surface, and The crushed polyvinyl chloride resin is allowed to settle, and (c) water is sprayed from the outlet side of the cylindrical rotator into the cylindrical rotator, and the crushed polyethylene resin material floating on the water surface is moved toward the inlet of the cylindrical rotator. From the cylindrical rotary body through the weir together with the water to collect the crushed polyethylene resin, and (d) the crushed polyvinyl chloride resin settled at the bottom of the cylindrical rotary body is removed by the helical means. By separating the polyethylene resin and the vinyl chloride resin from the nugget waste, which is collected by flowing out of the cylindrical rotary body with water from the outlet side of the cylindrical rotary body to the outside and recovering the same, How to yield is provided. According to one embodiment of the present invention, the spiral means is a spiral blade provided on an inner wall surface of the cylindrical rotating body, or a spiral groove formed on an inner surface of the cylindrical rotating body.

According to another aspect of the present invention, there is provided (a) a kiln having an inlet and an outlet, a spiral means provided on an inner wall surface, a weir at the inlet, and capable of storing water therein. (B) support means for holding the kiln rotatably in the longitudinal axis direction such that the kiln inlet side is lower than the outlet side, and (c) means for rotationally driving the kiln;
(D) a chute means for charging nugget waste comprising a mixture of crushed polyethylene resin and crushed vinyl chloride resin into the kiln from the kiln inlet side;
(E) water jetting means for spraying water from the kiln outlet side into the kiln, wherein the polyethylene resin crushed material floating on the water surface passes through the weir together with the water from the kiln inlet side to the outside of the kiln. While the crushed vinyl chloride resin settled at the bottom of the kiln flows out of the kiln outlet along with the water by the spiral means rotating together with the kiln and is collected outside the kiln. An apparatus for separating and collecting polyethylene resin and vinyl chloride resin from nugget waste is provided. According to one embodiment of the present invention, the spiral means is a spiral blade disposed on an inner wall surface of the kiln, or a spiral groove formed on an inner wall surface of the kiln. According to another embodiment of the present invention, an external dewatering device is provided near the kiln inlet. Preferably, a mesh screen is installed on the upper surface of the dehydrator, and more preferably, the mesh screen of the dehydrator can be vibrated.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method and an apparatus for separating and recovering a polyethylene resin and a vinyl chloride resin from nugget waste according to the present invention will be described in more detail with reference to the drawings.

Embodiment 1 FIGS. 1 and 2 show an embodiment of a separation and recovery apparatus according to the present invention. In the present embodiment, the separation / recovery device 1 has a kiln 2 which is a rotating body having a substantially cylindrical shape, one end of which is an inlet 3 and the other end of which is an outlet 4. The kiln 2 is provided with bearing means 5 such that it can rotate about a longitudinal axis (O).
And supported by the support means 6. Also kiln 2
Are supported such that the inlet 3 side is lower than the outlet 4 side. Further, the kiln 2 is rotated by the driving means 10 at a predetermined rotation speed. As the driving means 10, for example,
As shown, the driven gear 1 disposed on the body of the kiln
1 and a motor 13 having a driving gear 12 meshed with the driven gear 11.

In this embodiment, the kiln 2 has an inner diameter (D) of 700 mm, a length (L) of 4 m, and a longitudinal rotation axis (O) inclined by an angle (α) 4 ° with respect to the horizontal. Was placed. The kiln 2 is normally rotated at 1 to 10 rpm.

According to the present invention, the spiral means 20 is formed on the kiln inner wall surface 2A. In this embodiment, the spiral means 20 is a spiral blade 20 that rotates together with the kiln 2.

The shape and dimensions of the spiral blade 20 can be arbitrarily designed as desired, but the thickness (t) is such that the height (h) from the inner wall of the kiln is 50 to 300 mm.
Is 3-5mm steel plate pitch (p) 100-400mm
And formed on the inner wall of the kiln. In this embodiment, the thickness (t) is 3.2 mm.
Good results could be obtained by attaching the spiral blade 20 having a height (h) of 100 mm and a pitch (P) of 300 mm to the kiln inner wall surface 2A using the steel plate of No. 1 above.

At the entrance 3 of the kiln 2, there is provided a weir 7 for retaining water inside the inclined kiln. In this embodiment, the weir 7 is formed by providing an end wall having a center hole 8 at the entrance 3. In this embodiment, the height (H) of the weir 7 was set to 200 mm. In the kiln entrance 3, nugget waste 1 conveyed by conveying means 30 such as a conveyor belt is provided.
A chute means 31 for charging 00 into the kiln 2 is disposed through the center hole 8 of the end wall, and a dewatering device 32 is disposed below the outer side adjacent to the kiln inlet 3.

The dehydrator 32 has a container 33. The container 33 has, for example, a funnel shape, a drain port 34 is formed at the bottom, and a mesh screen 35 is provided at the upper opening. The container upper opening, that is, the screen 35 is provided so as to be inclined in one direction, and in this embodiment, to the left side in FIG. The screen 35 has a mesh (mesh) of an appropriate size, and in this embodiment, the nugget waste 100
Was about 2 to 3 mm, so a 1 m / m screen 35 was used.

On the other hand, according to the present invention, a water injection (spray) means 36 is provided at the kiln outlet 4 for injecting water to the kiln inner wall surface. As the spraying means 36,
For example, EX2 type (product name) manufactured by Niikura Co., Ltd.
Etc. can be used effectively.

Next, the operation of the separation / recovery device 1 having the above-described structure according to the present invention will be described.

The kiln 2 is rotated by the driving means 10 at a predetermined rotational speed, in this embodiment at 4 rpm. On the other hand, water is sprayed from the spray means 36 arranged at the kiln outlet 4 to the inner wall of the kiln at 8000 L (liter) / hr. Therefore, water accumulates inside the kiln, and excess water flows out of the kiln through the weir 7 at the inlet 3 and further from the outlet 4.

The nugget scrap 100 made of a mixture of the polyethylene resin 101 and the vinyl chloride resin 102 which has been pulverized into a crushed product having a diameter of 2 to 3 mm is introduced into the kiln by the conveying means 30 and the chute means 31, for example, 150 mm.
kg / hr. In this embodiment, the chute means 31 supplies the nugget debris 100 to the inside of the kiln 2 at a distance (L1) of 0.5 to 1.0 m from the weir 7. The position is appropriately determined by adjusting the length.

Nugget waste 10 charged into kiln 2
When 0 is fed into the water stored in the kiln, the crushed polyethylene resin material 101 floats on the water surface, and the crushed vinyl chloride resin material 102 sinks. Therefore, the crushed polyethylene resin material 101 floating on the water surface flows over the weir 7 to the outside of the kiln together with the water flowing inside the kiln, and flows out to the dewatering device 32.

On the upper surface of the dehydrator 32, a screen 35 is provided.
Is arranged, only water flows into the container 33,
It is discharged through the outlet 34 at the bottom. On the other hand, the crushed polyethylene resin material 101 remaining on the screen 35 is
It flows down along the inclined surface of the screen 35 and is stored in a mesh basket 37 which is an appropriate mesh. A vibrating sieve can be provided to facilitate dewatering and movement of the crushed polyethylene resin 101 along the inclined surface of the screen 35.
As the vibrating sieve, for example, a ripple flow type (trade name) manufactured by Furukawa Metal Machine Co., Ltd. can be effectively used.

According to the experiments of the present inventors, the crushed polyethylene resin 101 collected in the net basket 37 did not contain the crushed vinyl chloride resin 102 at all. The water content in the crushed polyethylene resin material 101 collected in the net basket 37 was 22.6%. The collected crushed polyethylene resin 101 can be further dehydrated by a dehydrator (not shown) to a water content of about 4.4%. Recovered crushed polyethylene resin 101
Is usually used as fuel.

The crushed vinyl chloride resin 102 settled to the bottom of the kiln is guided toward the kiln outlet 4 by the spiral blades 20 formed on the inner wall of the rotating kiln 2, and a part of the water is discharged from the kiln outlet 4. Along with this, it flows out of the kiln and is stored in a mesh basket 38 which is an appropriate mesh. At this time, the crushed polyethylene resin material 101 adhered to the kiln inner wall or the spiral blade 20 and conveyed to the kiln outlet 4.
Are washed by the spray means 36 and flow toward the kiln inlet 3 together with water. Therefore, the content of the crushed polyethylene resin 101 in the crushed vinyl chloride resin 102 recovered in the net basket 38 is very small, and according to the results of the experiments of the present inventors, 0.5% (weight). Met. or,
The water content in the recovered crushed vinyl chloride resin 102 was 35.0%. The collected crushed vinyl chloride resin 102 can be further dehydrated to a water content of about 24.0% by a dehydrator (not shown). The collected crushed vinyl chloride resin 102 is usually reused as an industrial raw material.

Second Embodiment In the first embodiment, the spiral means provided on the inner wall of the kiln 2 has been described as the spiral blade 20 attached to the inner wall surface 2A of the kiln, but in this embodiment, it is shown in FIG. like,
The spiral means 20 can be a groove formed in the kiln inner wall surface 2A. Other configurations of the separation / collection apparatus 1 are the same as those of the first embodiment, and therefore, members having the same configuration and function are denoted by the same reference numerals, and detailed description is omitted.

The shape and dimensions of the spiral groove 20 can be arbitrarily designed as desired, but when the same kiln as the kiln 2 described in the first embodiment is used, the groove width (W) becomes 50.
１００100 mm, depth (T) is 100-200 mm, and pitch (P) is 100-400 mm. In this embodiment,
By setting the groove width (W) to 70 mm, the depth (T) to 150 mm, and the pitch (P) to 300 mm, good results could be obtained, and the same function and effect as in Example 1 could be achieved. .

[0024]

As described above, according to the present invention, water is stored in a cylindrical rotating body such as a kiln, nugget debris is fed into the water, and the polyethylene resin crushed material floating on the water surface is removed. Collected crushed polyethylene resin by flowing out of the cylindrical rotary body with water from the cylindrical rotary body inlet side,
Then, the crushed vinyl chloride resin settled at the bottom of the cylindrical rotating body is recovered by flowing out of the cylindrical rotating body together with water from the outlet side of the cylindrical rotating body to the outside by the spiral means provided on the inner wall of the cylindrical rotating body. So, from nugget waste consisting of a mixture of polyethylene resin and vinyl chloride resin,
Polyethylene resin and vinyl chloride resin can be easily and effectively separated and recovered.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of an apparatus for separating and collecting polyethylene resin and vinyl chloride resin from nugget waste according to the present invention.

FIG. 2 is a schematic explanatory view illustrating a shape of an embodiment of a spiral blade installed on an inner wall surface of a kiln.

FIG. 3 is a schematic configuration diagram of another embodiment of an apparatus for separating and collecting polyethylene resin and vinyl chloride resin from nugget waste according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Separation and collection apparatus 2 Cylindrical rotating body (kiln) 3 Kiln inlet 4 Kiln outlet 5 Bearing means 6 Support means 7 Weir 10 Kiln drive means 20 Spiral means (spiral blade, spiral groove) 30 Transport means 31 Chute means 32 Dehydrator 35 mesh screen 36 water injection means 100 nugget waste 101 crushed polyethylene resin 102 crushed vinyl chloride resin

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kenji Higashikawa 152 Yufutsu, Tomakomai City, Hokkaido Tomakomai Chemical Co., Ltd. F-term (reference) 4D071 AA02 AA06 AA65 AB03 AB14 AB43 CA03 DA15 4F301 AA13 AA17 BA10 BA13 BA15 BA17 BA21 BE32 BF02 BF03 BF09 BF12 BF26 BF27

Claims (7)

[Claims] (A) A cylindrical rotary body having an inlet and an outlet at both ends in a longitudinal axis direction and having spiral means formed on an inner wall surface is rotated around the longitudinal axis by being inclined so that the inlet side is lowered. And a weir is provided on the inlet side so that water can be stored in the cylindrical rotating body, and (b) a mixture of the crushed polyethylene resin and the crushed vinyl chloride resin from the inlet side of the cylindrical rotating body. Nugget waste is charged into the cylindrical rotating body, the polyethylene resin crushed material floats on the water surface, and the vinyl chloride resin crushed material is settled,
(C) water is sprayed from the outlet side of the cylindrical rotating body into the cylindrical rotating body, and the crushed polyethylene resin floating on the water surface passes through the weir together with the water from the cylindrical rotating body inlet side to the cylindrical body. (D) the crushed polyvinyl chloride resin settled at the bottom of the cylindrical rotator is drained from the outlet of the cylindrical rotator by the spiral means. And separating and collecting the polyethylene resin and the vinyl chloride resin from the nugget waste. 2. The apparatus according to claim 1, wherein said spiral means is a spiral blade provided on an inner wall surface of said cylindrical rotating body or a spiral groove formed on an inner surface of said cylindrical rotating body. 1. A method for separating and collecting polyethylene resin and vinyl chloride resin from nugget waste. 3. A kiln having an inlet and an outlet, a spiral means provided on an inner wall surface, a weir at the inlet, and capable of storing water therein, and (b) the kiln. Support means for holding the kiln at an inlet side lower than the outlet side so as to be rotatable about a longitudinal axis; (c) means for rotating and driving the kiln; and (d) crushed polyethylene resin from the kiln inlet side. A chute means for charging nugget waste consisting of a mixture of crushed vinyl chloride resin into the kiln; and (e) a water injection means for spraying water from the kiln outlet side into the kiln; The crushed polyethylene resin floating on the water surface flows out of the kiln through the weir from the kiln inlet side together with the water to the outside of the kiln, while the crushed polyvinyl chloride resin settled at the bottom of the kiln is the kiln An apparatus for separating and collecting polyethylene resin and vinyl chloride resin from nugget waste, wherein the spiral means rotates together with the water and flows out of the kiln from the kiln outlet to the outside of the kiln. 4. The nugget waste according to claim 3, wherein said spiral means is a spiral blade disposed on an inner wall surface of said kiln or a spiral groove formed on an inner wall surface of said kiln. For separating and recovering polyethylene resin and vinyl chloride resin from wastewater. 5. The apparatus for separating and recovering polyethylene resin and vinyl chloride resin from nugget waste according to claim 3 or 4, wherein a dewatering device is provided outside near the inlet of the kiln. 6. An apparatus for separating and collecting polyethylene resin and vinyl chloride resin from nugget waste according to claim 5, wherein a mesh screen is provided on an upper surface of said dehydrating apparatus. 7. The apparatus for separating and collecting polyethylene resin and vinyl chloride resin from nugget waste according to claim 6, wherein the mesh screen of the dehydrating apparatus is vibrated.