JPH068247A - Processing method for fiber reinforced plastics - Google Patents

Abstract

PURPOSE:To effectively utilize used fiber reinforced plastic by achieving the recovery of heat by burning the used fiber reinforced plastic treated by land filling treatment or the like in a cement baking process as auxiliary fuel. CONSTITUTION:Used fiber reinforced plastic is ground into a ground product with a particle size of 50mm or less, a roughly ground product with a particle size of 3mm or less and a finely ground product with a particle size of 90mum and respective products are supplied from the introducing port 13 of a preheater, the fuel supply device 21 of a calcination furnace 20 and the burner 32 of a rotary kiln 30 of a baking process to be effectively utilized as heat sources.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a used fiber reinforced plastic (hereinafter, the used fiber reinforced plastic is a waste FR
P)).

[0002]

2. Description of the Related Art Fiber reinforced plastics are plastic products containing reinforced fibers such as glass fibers and are useful as small vessels, water tanks, unit baths (bath troughs), other light and strong structures, and various containers. Produced in large quantities. Many of these products have passed their useful lives and become waste FRP and become large trash, and the treatment thereof has become a problem these days.

Waste FRP is conventionally treated as waste such as landfill, and since it does not decay, it is a problem that it is difficult to dispose of it. Conventionally, it is known that the waste FRP is destroyed using a construction machine or a large shredder and further crushed to a size of about 50 mm by a secondary crushing shredder or the like. But,
It is not known to effectively use this crushed product.

Further, it is recognized that the fine pulverization of waste FRP is extremely difficult. For example, Japanese Patent Laid-Open No. 63-39684 has developed the only pulverizer capable of finely pulverizing waste FRP. Is emphasized.

[0005]

SUMMARY OF THE INVENTION The present inventors have studied the recovery of waste FRP as a fuel in view of such circumstances, and can sufficiently use it as an appropriate auxiliary energy at each stage of the cement manufacturing process. It was confirmed.
The present invention aims to provide such a new technique.

[0006]

The present invention provides a method for treating waste FRP. Specifically, (a) waste FRP is crushed into lumps of 50 mm or less, and the crushed lumps are Put it in a preheater in the cement manufacturing process and use it as an auxiliary fuel. (B) Crush waste FRP to a particle size of 3 mm or less, and put this crushed material into a calcination furnace in the cement manufacturing process and use it as an auxiliary fuel. (C) Waste FRP is finely pulverized to a particle size of 90 μm or less, supplied to a pulverized coal burner in a cement manufacturing process, and co-firing with pulverized coal (d) Waste FRP having a particle size of 3 mm or less is turbo milled or vibrated milled. A method for treating fiber-reinforced plastics, characterized by finely pulverizing to a particle size of 90 μm or less. .

[0007]

The present inventor has noticed that in the cement firing process, by supplying various auxiliary fuels to appropriate positions in a large number of processes, solid fuel in a lump or powder form can be effectively used. . FIG. 2 is a schematic process diagram showing a simplified cement clinker firing process.

The cement raw material 1 is supplied to an inlet pipe 11 of a suspension preheater (which is actually composed of a large number of solid-gas heat exchange devices) 10 and is heated by gas-solid heat exchange with high-temperature waste gas to raise the temperature of the outlet pipe 12. Is supplied to the calciner 20. The exhaust gas is discharged through the discharge pipe 14. Calcination furnace 2
The fuel 2 is supplied to the fuel supply device 21 at 0. Calcination furnace 2
At 0, the cement raw material is calcined to accelerate the decarboxylation reaction.
The calcined cement raw material is supplied from the outlet pipe 22 to the rotary kiln 30. In the rotary kiln 30, the fine powder fuel 3 is supplied to the burner 32 to form the flame 33, and the cement raw material is fired to form the clinker 4. The clinker 4 is cooled by the cooler 40 and discharged.

Aggregate waste FR crushed to a particle size of 50 mm or less
P can be supplied to the inlet 13 at an appropriate position of the preheater 10 and burned, whereby the heat can be effectively used as a heat source for heating the cement raw material. In the process of this preheater, the waste FRP is gradually burned in a static state and therefore may be in the form of lumps, and its particle size is 50 mm or less from the viewpoint of handling.

The coarsely crushed powder having a particle size of 3 mm or less can be supplied into the calcining furnace 20 together with, for example, the calcining fuel 2.
The particle size of 3 mm or less must be set to a size suitable for completing combustion with other fuel within the time of staying in the calcining furnace, and is defined as described above. The finely pulverized product having a particle size of 90 μm or less can be mixed with the fine powder fuel 3 and supplied into the burner 32 of the rotary kiln 30. The size of 90 μm or less is a size limit for forming the flame 33 as the fine powder fuel and completely burning it.

Regarding the method of adjusting the particle size of the waste FRP, the crushing to a particle size of 50 mm or less may be carried out by the above-mentioned conventionally known means. The crushed material of 50 mm or less can be roughly crushed to 3 mm or less by a jaw crusher. Three
Various pulverizing means were studied for pulverizing waste FRP of mm or less to 90 μm or less. As a result, it was found that the turbo mill disclosed in Japanese Examined Patent Publication (Kokoku) No. 42-27021 can be used for fine pulverization. Although this turbo mill is originally intended for crushing plastics, it is not intended to finely crush waste FRP such as 20 μm or less, and the present invention has developed the technique. A vibrating mill can be used for fine pulverization.

[0012]

【Example】

[Example 1] Fig. 1 shows a crushing process of waste FRP. Figure 1
As shown in (1), a large shredder was used as a secondary crusher, and the waste FRP was crushed into crushed products having a particle size of 50 mm or less.
This crushed product, that is, the lump waste FRP, was directly introduced into the first conduit of the suspension preheater shown in FIG. As a result, we were able to reduce the amount of coal used as the main fuel. Further, since the ash generated by the combustion of the waste FRP is taken into the clinker as a raw material for cement, no waste is generated by using the waste FRP. As a result, it was also possible to obtain the effect of reducing the amount of waste FRP waste that required treatment such as landfill.

Example 2 The crushed product after the secondary crushing with the shredder shown in the process diagram of FIG. 1 was crushed into a crushed product of 3 mm or less using a jaw crusher as a crusher. This coarsely crushed product was put into the calcining furnace 20 shown in FIG. As a result,
It was possible to reduce the amount of fuel used in the calciner 20. Ash produced by combustion of waste FRP is taken into the clinker as a raw material for cement.

[Example 3] In the fine pulverization step shown in the pulverization step of FIG. 1, a coarsely crushed waste FRP product having a particle size of 3 mm or less was finely pulverized by a turbo mill to 90 μm or less. This 90μ
Finely pulverized products having a size of m or less were blown into the rotary kiln 30 from the burner 32 of the rotary kiln 30 shown in FIG. As a result, we were able to reduce the amount of coal used as the main fuel. Moreover, since the ash generated by the combustion of the waste FRP is taken into the clinker as a raw material for cement, no waste is generated by using the waste FRP. As a result, it was possible to obtain the effect of reducing the amount of waste that required landfill processing.

[0015]

EFFECTS OF THE INVENTION According to the present invention, waste FRP treated by landfill treatment or the like can be burned as an auxiliary fuel in the cement burning step to recover heat and effectively utilize it. Moreover, since the ash generated by the combustion of the waste FRP is taken into the clinker as a raw material for cement, no waste is generated by using the waste FRP.

[Brief description of drawings]

FIG. 1 is a crushing process diagram of waste FRP.

FIG. 2 is a process drawing of cement firing.

[Explanation of symbols]

1 Cement raw material 2 Calcining fuel 3 Fine powder fuel 4 Clinker 10 Preheater 11 Inlet pipe 12 Outlet pipe 13 Inlet port 14 Discharge pipe 20 Calciner 21 Fuel supply device 22 Outlet pipe 30 Rotary kiln 31 Shell 33 Flame 40 Cooler

Claims (4)

[Claims] 1. Waste crushed FRP into lumps of 50 mm or less,
A method for treating fiber reinforced plastics, wherein the crushed crushed material is put into a preheater in a cement manufacturing process and used as an auxiliary fuel. 2. A method for treating fiber reinforced plastic, which comprises crushing waste FRP into particles having a particle size of 3 mm or less and introducing the crushed material into a calcination furnace in a cement manufacturing process for use as an auxiliary fuel. 3. A method for treating a fiber-reinforced plastic, which comprises pulverizing waste FRP to a particle size of 90 μm or less, supplying it to a pulverized coal burner in a cement manufacturing process, and cofiring with pulverized coal. 4. A method for treating a fiber-reinforced plastic, which comprises pulverizing waste FRP having a particle size of 3 mm or less to a particle size of 90 μm or less using a turbo mill or a vibration mill.