JPH1086155A - Granulating method of waste synthetic resin material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a granulating method of a sheet-like synthetic resin material which has been hard to be granulated properly for blowing the material into a vertical metallurgy furnace such as a blast furnace. SOLUTION: A waste synthetic resin material is fractionated by its shape into a film-like synthetic material, a solid synthetic resin material, and a sheet-like synthetic resin material having an intermediate thickness of both the materials. The film-like synthetic resin material is shredded into small-pieces and, next, a melting/solidification granulation process 5 is applied thereto for forming resin particles (a) through a sieving and separating process 6. The solid synthetic resin material is subjected to shredding process 8, 10 to form synthetic resin particles (b) through a sieving process for separating iron debris or the like. Also, the sheet-like synthetic resin material is formed into sheet-like small pieces Co having the maximum dimension smaller than the maximum dimension of the film small pieces through shredding process 17, 19 followed by a melting and solidification granulation process 23 thereto. Then, synthetic resin particles consisting of the small pieces Co blended with the synthetic resin particles (b) are prepared. In this manner, blowing of the synthetic resim porticles can be done without giving adverse influences to operation of a vertical furnace such as blast furnace. Disposal of all waste synthetic resin bottle containers can also be done while contributing to the reduction of blast furnace costs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a granulation treatment method for pneumatically transporting waste synthetic resin material by piping and blowing it into a vertical metallurgical furnace such as a blast furnace.

[0002]

2. Description of the Related Art In recent years, the amount of waste synthetic resin material among industrial waste and general waste has been rapidly increasing, and its disposal has become a major social problem. Synthetic resin materials have a particularly large calorific value and damage the incinerator at the time of incineration, so that mass processing is difficult. Therefore, most of them are disposed of in landfills, but they are not environmentally friendly and the landfills are tight. Therefore, development of a method for treating a large amount of waste synthetic resin materials is desired.

Under the above circumstances, there has been proposed a method of effectively utilizing waste synthetic resin material as a partial substitute for coke in a blast furnace. For example, EP-A-0 622 465
A1 and JP-B-51-33493 disclose a technique of crushing a synthetic resin material and blowing it as fuel from a tuyere into a blast furnace. The former discloses that the particle size of the crushed synthetic resin material is 1 to 10 mm. And that the bulk density is 0.35 or more.

On the other hand, as a result of repeated studies by the present inventors, it has been clarified that the following problems should be solved when a synthetic resin material is blown into a blast furnace as a part of coke.
That is, when the waste synthetic resin material is crushed for blowing into a blast furnace, synthetic resin particles in various forms are obtained depending on the form of the waste synthetic resin material to be crushed and the crushing method. On the other hand, in order to inject into the blast furnace, the prerequisite is that the combustibility is good, the synthetic resin particles should not be suspended from the shelf in the storage tank, and a fixed amount should be cut out from the tank by a valve. (The above-mentioned, good fluidity) and not to cause clogging of the pipe curved part and the valve part during the pneumatic feeding (good transportability) are essential requirements. It has been clarified that the morphology of the granulated synthetic resin particles greatly affects the essential requirements.

[0005]

At present, there are various forms of waste synthetic resin materials supplied from the market, but according to the above-mentioned studies by the present inventors, the above-mentioned essential for injecting synthetic resin materials is described. It has been concluded that the following matters are important for preparing particles that meet the requirements.

[0006] Particles should be sorted into a film-like synthetic resin material and another synthetic resin material (hereinafter, referred to as "solid synthetic resin material"), and the particles should be prepared in separate granulation treatment steps. This is because the film-like synthetic resin material is extremely inferior in fluidity and transportability when crushed to a predetermined size.

The basic conditions of the granulation treatment are as follows. In the case of treatment of a film-like synthetic resin material, first, a small film piece having a predetermined size is crushed or cut, and then melted and solidified and granulated. In this melting and solidifying granulation process, for example, a small piece of film is treated with a crusher equipped with a high-speed rotary blade or the like for a certain period of time to reduce the particle size to a predetermined value or less. Then, the morphology of the semi-melted or melted rounded film strip is granulated. Thus, in the case of a film-like synthetic resin material, it is possible to prepare particles having excellent fluidity and transportability in the pneumatic step by passing through the melting and solidifying granulation step after the crushing step.

On the other hand, in the case of processing a solid synthetic resin material, small lumps having a predetermined particle size or less can be obtained by first crushing and then secondary crushing. This lumpy particle morphology presents an irregular polyhedron. These small agglomerate particles do not have a thin portion unlike the above-mentioned film small pieces, so that even in the secondary crushing, some of the particles do not semi-melt or melt, and have a slightly angular portion. However, the small lump particles have good fluidity and transportability.

In the above research, the thickness of the film-shaped synthetic resin material is not strictly defined, but it is almost 10
Those having a thickness of 0 μm or less are used as a guide, and those having a thickness of more than 0 μm are categorized as solid synthetic resin materials. The intended purpose has been achieved by sorting the film-shaped synthetic resin material and the solid synthetic resin material as described above.

However, as a result of further tests and studies, the present inventors have crushed a material having a thickness close to the category of a film-shaped synthetic resin material, which has been treated as a solid synthetic resin material so far. The small lump particles obtained in this way were more difficult to pneumatically send by piping than other small lump particles, and it was found that there was a risk of causing clogging of the piping. When the pipe is clogged, the injection of the synthetic resin material into the blast furnace must be interrupted, and the blowing operation becomes unstable, and the productivity of the hot metal is hindered.

However, a synthetic resin material which is a solid synthetic resin material and has a thickness close to that of the film-shaped synthetic resin material (hereinafter referred to as a "sheet-shaped synthetic resin material") is subjected to the same processing as that for the film-shaped synthetic resin material. And, even if it is processed for a certain period of time by a crusher such as a rotary blade so that the particle size becomes equal to or less than a predetermined particle size in the melting and solidifying granulation process, it takes time to process because of the thickness, and the crushed small pieces have relatively large heat capacity Therefore, it was found that semi-melting or melting as in the case of crushing a film-like synthetic resin material did not occur, and the film-like synthetic resin material remained in the form of a sheet-like strip, and was not necessarily granulated. In this case, it was found that pneumatic feeding of the synthetic resin material after the treatment was difficult.

Accordingly, an object of the present invention is to solve the above-mentioned problems, devise an appropriate granulation method for a sheet-like synthetic resin material, and apply an appropriate granulation treatment to all forms of a waste synthetic resin material. Another object of the present invention is to provide a method for granulating a waste synthetic resin material which is excellent in fluidity and transportability, and is suitable for performing a pretreatment suitable for blowing air into a blast furnace.

[0013]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems. First, the sheet-shaped synthetic resin material is simply crushed into a sheet-shaped strip having a predetermined particle size in the same manner as a normal solid synthetic resin material, and when they are pressurized in a tank, they adhere to each other, There is no space between the plate-like strips, and there is no space for gas to blow through, so there is no slippage between the synthetic resin strips, and it is not possible to cut out the synthetic resin from the tank properly,
It was found that clogging occurred in the piping during pneumatic transport.

Therefore, it is necessary to prevent the sheet-like strips from adhering to each other in the tank or during the pneumatic feeding. To do so, the sheet-like strips themselves are rounded, i.e., for example, semi-melted or melted and granulated to form voids between the particles, or, alternatively, separate between the sheet-like strips. By forming a void between the sheet-like strips by interposing a particulate synthetic resin material having the above-mentioned shape, the above-mentioned adhesion can be prevented. Thus, it has been found that voids can be formed between the sheet-like strips so that air can blow through, and the fluidity and transportability are improved.

The present invention has been made on the basis of the above-mentioned findings. According to the first aspect of the present invention, prior to blowing the waste synthetic resin material into a vertical metallurgical furnace, the waste synthetic resin material is granulated as a pre-processing treatment. Method, waste synthetic resin material is separated into a film synthetic resin material, a solid synthetic resin material, and a sheet synthetic resin material as an intermediate form between the film synthetic resin material and the solid synthetic resin material based on the form. (P) and a step (A) of preparing a synthetic resin particle (a) by subjecting the film-shaped synthetic resin material to a crushing treatment to form a film piece and subjecting the obtained film piece to a melting and solidifying granulation treatment. ), A step (B) of preparing a synthetic resin particle (b) by subjecting the solid synthetic resin material to a crushing treatment, and a step of subjecting the sheet-shaped synthetic resin material to a crushing treatment so as to be smaller than the maximum size of the film piece. Seat strip (c ₀₎ with a maximum dimension, characterized in that consisting by performing melting and solidification granulation treatment on the obtained sheet strip and the step of preparing synthetic resin particles (c) (C) Have

According to a second aspect of the present invention, in the above invention, in the step (C), the sheet-like synthetic resin material is subjected to a crushing treatment, and the sheet strip (c ₀ ) having a maximum dimension smaller than the maximum dimension of the film strip. And then a step (D) of preparing synthetic resin particles (d) by mixing the obtained sheet strip (c ₀ ) with the synthetic resin particles (b) obtained in the step (B). It has.

[0017]

Next, an embodiment of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 is a system diagram showing an example of the embodiment of the invention described in claim 1. The waste synthetic resin material generated in the market is separated into a film-like synthetic resin material, a solid synthetic resin material and a sheet-like synthetic resin material in a separation step P. It is sufficient that the separation method is an ordinary method, but the thickness of the sheet-like synthetic resin material is preferably, for example, in the range of 100 μm to 3 mm in order to efficiently granulate in the step C. . After the film-shaped synthetic resin material is cut into a predetermined shape by the crushing device 1, the film-shaped synthetic resin material is pseudo-adhered by cutting frictional heat, and becomes an overlapped film-shaped synthetic resin small piece. The small piece of film from which iron dust has been removed by treatment with the dispersed synthetic resin magnetic separator 3 is appropriately passed through a material discriminator 4 to determine the type of the synthetic resin material.

Next, the small film pieces are charged into a melting and solidifying granulation apparatus 5 and subjected to a predetermined treatment. FIG. 2 is a diagram illustrating the function of the melting and solidifying granulation apparatus. A rotary crusher 33 provided in a crushing chamber 32 through a loading port 31 for a film piece.
And the film pieces are crushed into small pieces and semi-melted or completely melted by frictional heat. The film pieces discharged from the pair of rotary crushers 33 are quenched by a cooling medium (for example, water spray) injected from a nozzle 34, are contracted and solidified into granules, and become synthetic resin particles (a) from an outlet 35. Is discharged.

FIG. 3 is a diagram for explaining the principle that the film pieces are crushed into small pieces by the rotary crusher 33 of the melting and solidifying granulation apparatus shown in FIG. is there. The film piece 41 is cut by a rotating blade 42 rotating at a high speed and crushed to form a film piece, and the film piece 41 is cooled with a cooling fluid to obtain the synthetic resin particles (a). FIG. 2A shows a case where the temperature is increased by frictional heat during crushing, but the film piece hardly melts or is semi-melted. FIG. 2B is a case where the film is melted by frictional heat and cooled by a cooling fluid. In this case, synthetic resin particles (a) are obtained.

As the target particle size of the synthetic resin particles, a predetermined value:
Consider a case where a product having a diameter of D ₀ mm or less is obtained. Rotary crusher 3
As the rotation speed and processing time of 3 increase, the temperature of the film piece increases and melts, while the maximum size of the crushed film piece decreases with increasing rotation speed and processing time. In such a course, the crushing conditions are adjusted so that the maximum dimension reaches the target value D ₀ mm or less and the temperature at that time is the temperature T ₀ lower by a predetermined value than the melting point, and the crushed film piece The crushed film pieces are quenched when both the maximum dimensions and temperature satisfy this condition.

If the temperature of the crushed film piece does not reach T ₀ even though the maximum size of the crushed film piece has reached D ₀ mm or less, the rise in the temperature is suppressed while suppressing the increase in the crushing speed. In the case where the maximum size of the film piece does not reach D ₀ mm or less even though the temperature of the film piece has reached T ₀ , crushing is performed while suppressing the temperature rise. Adjust so that the speed rises faster. In this way, the particle size by the melting / solidification granulation process is adjusted.

In this way, the melting and solidifying granulation is performed, and the obtained synthetic resin is processed by the sieving / separator 6 to obtain the synthetic resin particles (a). This is stored in the storage tank 7 (above, step (A)).

The solid synthetic resin material is roughly crushed by the primary crusher 8 and treated by the primary magnetic separator 9 to remove iron scraps.
After being finely crushed by the secondary crusher 10 and treated by the secondary magnetic separator 11 to remove iron swarf and other foreign substances, the synthetic resin material which is pseudo-adhered by crushing frictional heat is dispersed by the separator 12. The dispersed synthetic resin material is appropriately passed through a material discriminating device 13 to analyze the material of the synthetic resin material. Next, the synthetic resin material is treated by the sieving / separator 14 to obtain the synthetic resin particles (a). This is stored in the storage tank 16 (above, step (B)).

The sheet-like synthetic resin material is first roughly crushed by the primary crusher 17 and treated by the primary magnetic separator 18 to remove iron chips in the same manner as the treatment of the solid synthetic resin material.
After being finely crushed by the secondary crusher 19 and treated by the secondary magnetic separator 20 to remove iron dust and other foreign matters, the separator 21 disperses the synthetic resin material which is pseudo-adhered by crush friction heat. Dispersed to obtain a sheet strip (c ₀ ). Here, the dimension of the sheet strip (c ₀ ) must be smaller than the maximum dimension of the above-mentioned film strip. This is because in the following melting and solidification granulation process, when the temperature is raised by frictional heat to semi-melt or melt and granulate, if the size is too large, the frictional heat will be widely transmitted to the inside of the sheet strip and semi-molten Alternatively, it does not result in melting and is difficult to granulate. Next, the synthetic resin material is appropriately passed through a material discriminating device 22 to analyze the material of the synthetic resin material. Next, the sheet strip is charged into the melting and solidifying granulation apparatus 23 and subjected to a predetermined treatment. In the melting and solidifying granulation process, the sheet strip is granulated by semi-melting or melting, so that the sheet becomes thicker and more round at the same time. Next, the synthetic resin material is treated by a sieving / separator 24 to obtain synthetic resin particles (b). This is stored in the storage tank 25 (above, step (C)).

The on-screen synthetic resin particles after the sieving / separation treatment in the steps (A) to (C) can be returned to the crushing treatment and reused. FIG. 4 shows a pneumatic facility 50 for blowing synthetic resin particles obtained by granulating waste synthetic resin material into a blast furnace as described above.

The synthetic resin particles (a), (b) and (c) obtained as described above are stored in the respective storage tanks (7) and (1).
Cut out from 6) and (25), mix appropriately and pneumatically feed to the service tank 51, pneumatically transported from the service tank 51 and sent to the storage tank 52, sent out from the blowing tank 54 through the equalizing tank 53, and then In the blast furnace equipment 56, the air is blown into the inside of the blast furnace 59 from a blowing pipe 58 installed in the blast furnace tuyere 57.

FIG. 5 is a system diagram showing an example of the embodiment of the invention described in claim 2. The steps (A) and (B) are the same as those in FIG. 1, but the step (D) is different from the step (C). That is, in the step (D), the synthetic resin particles (C ₀ ) prepared in the step (B) are not subjected to the melting and solidifying granulation treatment on the sheet strip (c ₀ ) produced in the middle of the step (C). b) to prepare synthetic resin particles.

[0028]

Next, the present invention will be described in more detail with reference to examples. After mixing and mixing the synthetic resin particles (a), (b) and (c) which have been subjected to granulation based on the pre-processing step of the waste synthetic resin material shown in FIGS. 1 and 2 at a predetermined ratio, Then, it was blown into the blast furnace by the pneumatic equipment shown in FIG. 4 (Example 1). Further, the synthetic resin particles (a), (b) and (d) which have been subjected to granulation based on the pre-processing step of the waste synthetic resin material shown in FIGS.
After mixing, it was blown into the blast furnace with the pneumatic equipment of FIG. 4 (Example 2). On the other hand, for comparison, the sheet-shaped synthetic resin is subjected to the same treatment as in the step (B), and the obtained synthetic resin particles (hereinafter referred to as “synthetic resin particles (e)”) are synthesized with the synthetic resin particles (a) and (b). After mixing and mixing at a predetermined ratio with
A blast furnace was blown in the same manner as in the example (comparative example).

Table 1 shows the specifications of the sheet-shaped synthetic resin material before and after the granulation treatment among the waste synthetic resin materials subjected to each test.

[0030]

[Table 1]

In each of the tests, the sheet-like synthetic resin material used was the same form of the sheet-like PET resin having a thickness of 0.5 mm separated in the step (P). In Example 1, this was crushed into sheet strips (c ₀ ) having a size of 6 mm or less in the step (C), and then prepared into synthetic resin particles (c) having a particle size of 1.5 mm or less by a melting and solidifying granulation treatment. did.

In Example 2, the sheet-like PET resin was crushed into sheet strips (c ₀ ) of 6 mm or less in the step (D), and then the synthetic resin particles prepared from the solid synthetic resin material in the step (B) were used. (B), which was mixed with massive particles having a maximum dimension of 3.2 mm (material: PE resin). The mixing ratio is PE
T resin sheet strip (c ₀ ): 2: 1 mass of 3.2 mm block particles of PE resin. In the comparative example, the maximum dimension was 6 mm.
And synthetic resin particles (e).

Table 1 also shows the time during which the blowing of synthetic resin particles into the blast furnace due to trouble in cutting out from the tank during the two-day continuous operation test period was stopped. In the comparative example, 4.
The blowing into the blast furnace was stopped due to a 2 hr / d cutting trouble, but none of them occurred in the examples. The above results indicate the usefulness of the present invention.

[0034]

The sheet-shaped synthetic resin material is difficult to handle in the pre-processing for blowing the waste synthetic resin material into a vertical metallurgical furnace such as a blast furnace, and there has been no suitable processing method in the past. According to the configuration described above,
It can be blown without adversely affecting the operation of a vertical furnace such as a blast furnace. Further, it is possible to provide a method of granulating the waste synthetic resin material, which can treat the waste synthetic resin bottle container while contributing to a reduction in the cost of the blast furnace, thereby providing an industrially useful effect.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an example of an embodiment of the invention described in claim 1.

FIG. 2 is a diagram illustrating functions of a melting and solidifying granulation apparatus.

FIG. 3 is a diagram illustrating the principle of granulating a synthetic resin strip by the melting and solidifying granulator of FIG. 2;

FIG. 4 is a system diagram of a pneumatic facility for blowing synthetic resin particles subjected to granulation treatment into a blast furnace.

FIG. 5 is a system diagram showing an example of the embodiment of the invention described in claim 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crusher 2 Separator 3 Magnetic separator 4 Material discriminator 5 Melting / solidifying granulator 6 Sieving / separator 7 Storage tank 8 Primary crusher 9 Magnetic separator 10 Secondary crusher 11 Magnetic separator 12 Separator 13 Material discrimination Machine 14 Sieving / separating machine 16 Storage tank 17 Primary crusher 18 Magnetic separator 19 Secondary crusher 20 Magnetic separator 21 Separator 22 Material discriminator 23 Melting / solidifying granulator 24 Sieving / separator 25 Storage tank 31 Inlet 32 Crushing chamber 33 Rotary crusher 34 Nozzle 35 Discharge port 41 Film piece 42 Rotating blade 50 Pneumatic equipment 51 Service tank 52 Storage tank 53 Equilibrium tank 54 Blow tank 55 Accumulator 56 Blast furnace equipment 57 Tuyere 58 Blow pipe 59 Blast furnace

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Minoru Asanuma 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Hiroshi Yamada 1-1-2, Marunouchi, Chiyoda-ku, Tokyo Sun Inside the Kokan Co., Ltd. (72) Inventor Masuhiro Fujii 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Japan Inside the Kokan Co., Ltd. (72) Inventor Kazuma Wakimoto 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Japan Inside Steel Pipe Co., Ltd.

Claims (2)

[Claims] 1. A method of granulating a waste synthetic resin material prior to blowing the waste synthetic resin material into a vertical metallurgical furnace,
The waste synthetic resin material is separated into a film-like synthetic resin material, a solid synthetic resin material, and a sheet-like synthetic resin material as an intermediate form between the film-like synthetic resin material and the solid synthetic resin material based on the form. A step (P) of preparing a synthetic resin particle (a) by subjecting the film-shaped synthetic resin material to a crushing treatment to form a film piece, and then subjecting the obtained film piece to a fusion / solidification granulation treatment; (A), a step (B) of preparing a synthetic resin particle (b) by subjecting the solid synthetic resin material to a crushing treatment, and a step of subjecting the sheet-like synthetic resin material to a crushing treatment to determine a maximum size of the film piece. seat strip (c ₀₎ with a maximum dimension is small, by subjecting a molten and solidified granulation treatment on the sheet strips then obtained it was somethin step of preparing synthetic resin particles (c) (C) Granulation process of the waste synthetic resin material, characterized by comprising. 2. The method according to claim 1, wherein the step (C) comprises:
_{2. The} method for granulating waste synthetic resin material according to claim 1, wherein the step (D) is a step of preparing synthetic resin particles (d) by mixing ( ₀ ) and the synthetic resin particles (b).