JPS5962383A - Treatment of waste synthetic polymer by compacting and solidifying - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for disposing of (hereinafter referred to as unburnable waste).

As a volume reduction and solidification treatment method for waste containing synthetic polymers (uncombustible waste), granular inorganic substances are added to urban waste containing synthetic polymers, and the temperature is heated to 120°C or higher, preferably 180 to 400°C, in a rotating cylindrical body. The applicant of the present invention has already proposed a method for obtaining a granular solidified material with the above-mentioned powdery inorganic material as a core by heating the rotary cylindrical body to a temperature of Showa 52-13
No. 0591).

Also, as an apparatus used to carry out the above method invention,
'Rei (Japanese Patent Application No. 17963-1983, Japanese Patent Application Laid-Open No. 1983-1989), which also proposes a treatment device for waste containing synthetic polymers.
(See Publication No. 110279).

Furthermore, as an improved version of the above device, the granulation zone with co-rotating cylindrical bodies has a dual-rotating cylindrical structure, and a large number of holes are provided in the inner and outer rotating cylindrical bodies of the granulation zone to form a screen structure.
The diameter of the hole provided in the inner rotating cylindrical body is made larger than the diameter of the hole provided in the outer rotating cylindrical body, so that the unreduced volume, the granular mixed solidified material, and the small particle size substance in the rotating cylindrical body can be separated.翫 (Utility Application No. 105145-1983, Japanese Patent Application Laid-open No. 57-1981) proposes a volume reduction and solidification treatment device for synthetic polymer waste.
(See Publication No. 28738).

We have been using the method proposed above to treat non-combustible waste that is disposed of as household waste (municipal waste).

However, all of these proposed treatment methods and devices are based on land landfill treatment.

The content composition of non-combustible household waste is diverse, and in addition to synthetic polymers, it also contains a large amount of bottles, leather, etc., as well as plastic containers and other non-combustible waste. This includes many papers that can be peeled off from labels, etc., which are in their original form or cut into small pieces, without adhering to synthetic polymers, etc.
The rotary cylindrical body is discharged from the processing device in its raw state.

Table 1 shows an example of the composition of non-combustible waste from tea ceremonies, which is collected separately.

On the other hand, in recent years, it has become extremely difficult to find a land-filling site for unburnable waste, and the situation has become such that there is no choice but to look for a site at sea.

When volume-reduced and solidified material is dumped at sea, the granular mixed solidified material with powdery inorganic materials as the core and metals easily sink into the sea, but lightweight materials such as paper float or flow out onto the sea and become new. There is a possibility that this will develop into a pollution problem.

As shown in Table 1, a larger amount of lightweight waste such as paper is included than expected, and since the labels and the like are not included, the actual amount is even greater.

It is necessary to forcibly separate and remove these lightweight materials such as paper before dumping them into the sea. Generally, wind sorting of waste after volume reduction and solidification treatment is proposed as a method for this purpose, but we have found a more economical and effective method and hereby propose a new method.

That is, the present invention adds powdered inorganic particles to waste containing synthetic polymers, heats and stirs them in a rotating cylindrical body, and forms a granular mixture of synthetic polymers and powdered inorganic substances with the powdered inorganic substances as a core. In a volume reduction solidification treatment method for converting into a solidified product, the waste and caloric gas are introduced from opposite directions, for example, the waste is introduced from the front of the rotating cylindrical body and the heating gas is introduced from the rear of the rotating cylindrical body. A volume reduction and solidification treatment for synthetic polymer waste, characterized by colliding them in a rotating cylindrical body, entraining light waste such as paper into circulating gas, and then separating and collecting the light waste from the heated gas. Regarding the method.

According to the present invention, lightweight waste such as paper is not entangled with synthetic polymer waste in the rotating cylindrical body and is discharged outside the system in a state close to its original form. Light-weight garbage such as barrels of paper can be efficiently taken out.

An embodiment of the method of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional elevational view showing an apparatus for carrying out the method of this embodiment.

In Figure 1, (1) is the first fixed cylinder provided at the front, to which a hopper (2) and a screw feed blade 3) provided below are attached. There is.

(4) is an outlet for paper and other lightweight waste provided at the bottom of the first fixed cylinder, and (5) is a second fixed cylinder provided at the rear on the opposite side of the first fixed cylinder (1). introduction hole (6),
A small particle diameter outlet (7), a granulated material outlet (8), and a non-volume-reduced material outlet (9) are installed.

00 is a rotating cylinder, which is rotatably disposed between the first fixed cylinder (1) and the second fixed cylinder (5).

A plurality of scraping plates (12) are attached to the inner surface of the rotating cylinder αO in the longitudinal axis direction of the rotating cylinder.

(11) is an outer cylinder disposed outside the rotating cylinder OQ, and the rotating cylinder OQ and the outer cylinder (11) form a double cylinder.

The rotating cylinder OQ and the outer cylinder (11) rotate together at the same rotation speed. The outer peripheries of the rotating cylinder OQ and the outer cylinder (II) are connected to the second fixed cylinder (
5) is airtightly connected.

Note that the rotating cylinder α1 is rotated to a predetermined rotational speed by a prime mover and a drive device (not shown).

Heated gas is generated in the furnace (18), introduced into the rotating cylinder OQ through the introduction hole (6), and flows countercurrently with the waste. 1 from the fixed cylindrical body (1) to the furnace (1) via the circulation line [+51
You can return to 8). - Force-quenching gas (17) and air (1
9) is discharged from the branch line (16) to the outside of the yarn.

Next, the effects of this device will be explained.

A mixture of waste containing synthetic polymers and powdery inorganic substances is guided from a hopper (2) into a rotating cylinder αO by a screw feeder (8). The mixture supplied to the rotating cylinder αG is heated by the heating gas while being stirred by the stirring blade (12), and is softened and reduced in volume. This softened and volume-reduced mixture is transferred to the rear while being completely stirred by the stirring blade (12), and is granulated using the powdery inorganic material as a core.

However, among non-thermoplastic materials, paper and other materials are close to their original form.
It remains in the tO form. Bottles that do not reduce volume are used to promote the granulation effect of synthetic polymer substances.

It is preferable to remove these papers together with cans and bags in the granulation zone.

To this end, we proposed a method of performing air separation in the granulation zone A at the rear end of the rotating cylinder aQ. That is, the wind speed of the heated gas in the granulation zone was set at a speed that would not scatter the synthetic polymers but only scatter lightweight waste such as paper. This wind speed is the waste moisture.

Although it varies depending on the composition etc., a wind speed of about 0.5 to 2 m1sec is sufficient. In other words, by flowing heated gas in a countercurrent flow to the mixture, lightweight materials such as paper are blown back to the front (inlet side) of the rotating cylinder, and finally flow from the end of the cylinder OQ into the first fixed cylinder (]). be blown away. If the passing wind speed of the first fixed cylinder (1) is set below the floating speed of paper and other lightweight waste, the paper and other lightweight waste will fall and accumulate at the bottom of the first fixed cylinder (1). Ru. The accumulated dust is discharged to the outside of the yarn by a low refill valve or a double damper (not shown). Note that the method for collecting lightweight waste outside the cylinder body is not limited to the above-mentioned method, and it is also possible to collect it using a cyclone or the like within the circulation system.

It should be noted that the synthetic polymer of the material to be processed that has reached the granulation zone begins to reduce its volume and become granulated using the powdery inorganic material as a core.

Here, those having a smaller diameter than the hole diameter of the screen (13) pass through the screen (13) and fall into the outer cylinder (11).

Items with a large diameter that do not pass through the screen (13) (non-volume reduced items) pass through the screening trommel as they are and are passed through the non-volume reduced item outlet (9).
It will be transferred to.

On the other hand, among the objects to be treated that have fallen into the outer cylinder (11), those smaller than the hole diameter of the screen (14) are removed from the screen (14).
and is transferred to the small particle outlet (7). The volume-reduced material that passes through the screen (I3) but does not pass through the screen (141) is transferred to the inner peripheral surface of the outer cylinder (11), granulated, and then transferred to the granulated material outlet (8).

Next, we will show the results of an experiment in which this device was used to reduce the volume of waste containing plastic.

(10) A rotating cylinder φ with a length of 6 m and a diameter of 2 m has a double rotating body structure starting 2 m from the end, and the hole diameter corresponding to the screen (13) in Fig. 1 is 60 mm, and the screen (14) The diameter of the hole corresponding to 10 mm was set, and the separately collected waste in the base cloth having the composition shown in Table 1 was supplied to this apparatus and subjected to volume reduction and solidification treatment.

(4), (7), (8), (9) in Figure 1
The weight percentages of the products obtained from the portion are shown in Table 2 below.

Table 2 As explained above, the present invention involves adding granular inorganic substances to urban waste containing synthetic polymers, heating them to a temperature of 180 to 400°C in a rotating cylinder, and stirring them. In the volume reduction solidification treatment method of converting the synthetic polymer substance and the added inorganic substance into a granular mixed solidified material by mixing, heating gas is supplied from the direction opposite to the direction of flow of the supplied waste. The hot gas flows countercurrently, and the synthetic polymers overcome the flow of the heated gas and flow into the wake of the rotating cylinder, but lightweight materials such as paper accompany the flow of the heated gas and become part of the waste stream. The waste flows in the opposite direction and is separated into lightweight waste and synthetic polymers, bottles, cans, etc. in the rotating cylindrical body, effectively preventing outflow in the case of landfilling at sea.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an example of an apparatus for carrying out the method of the present invention. 1. First fixed cylinder; 2: Honopa; 3. Screw feeder, 4. Light-weight garbage outlet, 5. Second fixed cylinder, 6: heating gas introduction hole, 7. Fine particle outlet, 8. Granule outlet, 9
: Non-reduced material outlet. 10: rotating cylinder, 11: outer cylinder, 12: scraping plate. 13: Volume reduction screen, 14: Fine particle screen 15
Heated gas circulation line, 16: Circulating gas discharge line,
17: Combustion gas introduction line, 18: Heating gas generation furnace. Procedural amendment (formality) Indication of the case 1982 Patent application No. 1 722/10
Name of the No. Invention Relationship with the Case of Person Who Amends Volume Reduction and Solidification Process for Synthetic Polymer Waste Patent Applicant Address 2-5-1 Marunouchi, Chiyoda-ku, Tokyo Name (620) Mitsubishi Heavy Industries, Ltd. Table 1 Examples of composition of non-combustible waste Table 2

Claims (1)

[Claims] A granular mixture of the synthetic polymer and the powdery inorganic material with the powdery inorganic material as a core by adding a powdery inorganic material to waste containing a synthetic polymer and heating and stirring the mixture in a rotating cylindrical body. In the volume reduction solidification treatment method for converting into a solidified product, waste material and heated gas are supplied inside the rotating cylindrical body in a countercurrent manner so that they collide with each other, and the velocity of the heated gas is adjusted to the floating velocity of lightweight materials such as paper. A volume reduction and solidification treatment method for synthetic polymer waste, characterized by bringing light waste such as paper into contact with the heated gas at a speed slightly exceeding .