JP2961293B2 - Plastic separation and recovery equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for separating and recovering plastic used for recovering only plastic suitable for oiling from waste plastic.

[0002]

2. Description of the Related Art For example, in order to reuse waste plastic in municipal waste, it is necessary to remove vinyl chloride that is not suitable for oiling and recover waste plastic suitable for oiling. A plastic separation and recovery device is used.

Conventionally, as this kind of plastic separation and recovery apparatus, as shown in FIG. 2, a separation tank (21) for separating a mixture of plastics into a low specific gravity substance and a high specific gravity substance, and a stirrer (23) And a charging tank (22) in which the bottom of the separating tank (21) is communicated with the bottom of the charging tank (22).

In this apparatus, appropriately pulverized plastic is charged from the opening of a charging tank (22) and a stirrer (2) is used.
A circulation flow is created in the charging tank (22) by 3), and plastic is placed on the circulation flow and moved to the separation tank (21) where there is almost no flow. In the separation tank (21), low-density substances (28) such as polyethylene suitable for oiling float up, and high-gravity substances (29) such as vinyl chloride unsuitable for oiling settle down and only the floating amount is collected. By doing so, only those suitable for oiling can be obtained.

[0005]

In the above-mentioned conventional apparatus for separating and recovering plastic, in the charging tank (22), a substance having a particularly low specific gravity, such as styrene foam, in the plastic floats on the water surface and obstructs the plastic that is subsequently charged. There was a problem of becoming.

Further, in the case of a hydrophobic plastic such as vinyl chloride, bubbles formed by stirring tend to adhere to the surface of the plastic, so that a part of the high specific gravity vinyl chloride, which should originally settle, floats in the separation tank. However, there is a problem that a low specific gravity material suitable for oiling contains a large amount of vinyl chloride unsuitable for oiling and is recovered.

[0007] An object of the present invention is to prevent low-density substances suitable for oiling and vinyl chloride not suitable for oiling, without styrofoam or the like floating in the charging path and obstructing plastics to be charged thereafter. An object of the present invention is to provide an apparatus for separating and collecting plastics which can be separated and collected with extremely high accuracy.

[0008]

Means for Solving the Problems] separation and recovery device of a plastic according to the invention, the separation tank for separating a mixture of plastic and low density material and high specific gravity equivalent to (1), leads to the separation tank (1) bottom droop Jo turned path and (2), the separation tank (1) et provided on the outer
A slurry adjusting tank (4) having a stirrer (7) for adjusting the plastic pulverized material to a slurry state; and a slurry adjusting tank.
(4) or lath projecting an extracted slurry-like plastic pulverized product
Pump (6) feeding downward into the inlet (2) and separation tank (1)
High specific gravity material (9) settled to the bottom is circulated out of the system by circulation (3).
And a high-specific-gravity substance recovery device to be extracted .

[0009]

According to the apparatus for separating and recovering plastics of the present invention, the pulverized plastics are fed into the charging path in the form of slurry by the pump. At this time, even a material having a small specific gravity, such as styrene foam, is forcibly moved to the bottom of the separation tank by the pump pressure and does not float and stay in the charging path. In addition, there is no need to create a circulating flow to send the plastic to the separation tank using a stirrer, so that the foam created by the stirring does not adhere to the plastic surface, and some of the high specific gravity vinyl chloride, which should originally settle, is eliminated. It does not float in the separation tank due to attached bubbles.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an apparatus for separating and recovering plastic according to the present invention. The apparatus comprises a separation tank (1) for separating a mixture of plastics into a low specific gravity substance and a high specific gravity substance, and a separation tank (1). ) A charging path (2) leading to the bottom, a slurry adjusting tank (4) for adjusting the plastic pulverized material into a slurry, and a pump () for feeding the pulverized slurry plastic from the slurry adjusting tank (4) to the charging path (2). 6) For example, in recycling waste plastic in municipal waste,
It separates vinyl chloride that is not suitable for oiling from waste plastic and recovers plastic that is suitable for oiling.
Water is contained in the separation tank (1), and vinyl chloride having a specific gravity of more than 1 sinks, and plastics suitable for oiling such as polyethylene and polypropylene having a specific gravity of less than 1 float.

The slurry adjusting tank (4) is for mixing the pulverized plastic with water to make the plastic into a slurry. The slurry adjusting tank (4) contains a stirrer (7).
Is arranged.

The charging path (2) has an inlet at the same height as the opening of the separation tank (1), and the pulverized slurry-like plastic sent by the pipe (5) is injected from the inlet. It has been made like that. The inlet may not be at the same height as the opening of the separation tank (1).

The pulverized slurry-like plastic material sent into the charging path is forcibly moved to the bottom of the separation tank (1) by a pump pressure. At this time, materials with low specific gravity, such as styrofoam, are also moved together,
(2) Styrofoam etc. do not float and stay inside.

In the separation tank (1), the flow of water is small, and each plastic exhibits characteristics according to its specific gravity. A low specific gravity material (8) such as polyethylene floats, and The sedimentation of the specific gravity (9) separates the plastic. When the low specific gravity (8) that has floated is recovered, a plastic that is very suitable for oiling without containing vinyl chloride unsuitable for oiling can be obtained. Settled high specific gravity (9)
Is collected on a circulating flow (3) created by an air lift, a pump or a screw.

In the above-mentioned plastic separation and recovery apparatus,
Since the styrofoam and the like do not float and stay in the charging path (2), the processing time can be shortened without obstructing the plastic to be charged thereafter. In addition, there is no need to dispose a stirrer in the charging tank as in the conventional device, so there is little chance that bubbles will adhere to the surface of hydrophobic vinyl chloride and float, and the device can be downsized. is there.

Table 1 shows that the conventional plastic separation and recovery apparatus shown in FIG. 2 and the plastic separation and recovery apparatus according to the present invention shown in FIG.
The result of performing a plastic separation and recovery experiment using waste plastic containing 0% is shown.

[0018]

[Table 1] As can be seen from this table, the waste plastic floating and staying in the charging path (2) (the charging tank (22) in the conventional equipment), the amount of hydrogen chloride (vinyl chloride) in the floating recovered material, and the recovery rate were all The apparatus for separating and recovering plastic of the present invention is excellent. The amount of waste plastic floating in the charging tank (22) of the conventional apparatus was an amount that obstructed the next charging plastic and needed to be removed.

[0019]

According to the apparatus for separating and recovering plastics of the present invention, styrene foam and the like do not float and stay in the charging path, so that they do not hinder the plastics to be charged later, and they do not originally sink. Very high-density vinyl chloride, which is not suitable for oiling, is separated from vinyl chloride, which is not suitable for oiling, because it does not float in the separation tank due to foam to which part of high-density vinyl chloride to be attached has adhered. And can be collected. In addition, plastic crushed
Dirt accumulates in the tank after being cleaned in the rally adjustment tank.
The separation tank is installed outside this slurry adjustment tank.
Dirt is difficult to transfer to the separation tank.
Separation due to dirt sticking to plastic
A decrease in efficiency can be prevented. Furthermore, it is settled at the bottom of the separation tank.
High specific gravity dropped out of the system by circulating flow
Float and sediment mix in the separation tank
Does not fit, thus increasing the separation efficiency
However, the sediment can be completely extracted.

[Brief description of the drawings]

FIG. 1 is a front view schematically showing a plastic separation and recovery apparatus according to the present invention.

FIG. 2 is a front view schematically showing a conventional plastic separation and recovery device.

[Explanation of symbols]

 (1) Separation tank (2) Input path (4) Slurry adjustment tank (6) Pump

Continuation of the front page (56) References JP-A-48-100760 (JP, A) JP-A-6-63944 (JP, A) JP-A-6-114839 (JP, A) Jpn. , U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B03B 1/00-13/06 B29B 17/00

Claims (1)

(57) [Claims] 1. A separation tank (1) for separating a mixture of plastics into a low specific gravity substance and a high specific gravity substance, a hanging charging path (2) leading to the bottom of the separation tank (1), and an outside of the separation tank (1). Provided and stirred
Slurry adjusting tank for adjusting the plastic pulverized slurried have agitator (7) and (4), the slurry adjusting tank (4) or Las <br/> turned path extracted slurry-like plastic pulverized product (2 )
Pump (6) feeding downward and sinking at the bottom of the separation tank (1)
High-density material (9) drawn out of the system by circulating flow (3).
A separation and recovery device for plastics, comprising a specific gravity recovery device.