JP3899563B2 - FRP waste disposal method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for treating FRP waste.
[0002]
[Prior art]
When FRP products that use glass fiber are no longer needed, glass fiber remains even after incineration, and instead of incineration, the volume increases or the fiber becomes brittle and scatters to the surroundings during work, making it difficult to handle It becomes. Glass fiber is non-flammable and does not rot, so there is no problem even if it is disposed of in landfills. However, since the fiber is long and strong, it is difficult to compress compactly, and there is a problem that it is bulky and processing costs are high.
For this reason, attempts have been made to finely pulverize FRP waste and put the powder into a concrete or reuse it as a filler used in FRP. However, due to various technical and economic problems, a sufficient amount cannot be processed and effectively used.
In order to solve these problems, FRP waste pulverized to an appropriate size is directly put into a glass short glass fiber melting furnace used for heat insulating materials, sound absorbing materials, etc. Japanese Patent Application Laid-Open No. 6-40735 discloses a method for producing a short glass fiber by melting a glass fiber part as a part of a raw material while using the above resin component as a heating fuel.
[0003]
However, the resin content of FRP products varies depending on the molding method. For example, the resin content is about 70% by weight in the hand lay-up method and about 30% by weight in the filament winding method. There is a big difference in the resin content depending on whether it is done. Also, those using flame retardants are mixed and the burning speed of the resin is different. Because of these differences, optimal combustion conditions are different, and in order to use these various raw materials in the same furnace, it is difficult to control the oxidation conditions in the furnace, and there is a risk that carbon components remain on the surface of the waste glass fiber. there were. When carbon components are entrained in the molten material, problems such as bubbles are generated and fibers are likely to break, so oxygen or air can be introduced into the furnace depending on the conditions in the furnace in order to further enhance resin combustion. It requires advanced furnace operation technology.
Moreover, since the inside of the melting furnace is in a red hot state at a high temperature, it is very difficult to grasp the state of the carbon component in the molten raw material.
[0004]
[Problems to be solved by the invention]
As described above, although the FRP waste is generated in a large amount, there is no decisive factor in its processing. The present invention prevents the carbon component from entering the melt when the FRP waste is directly put into the melting furnace, and a part of the raw material of the short glass fiber or rock wool produced in a large amount is contained in the FRP waste. The glass fiber and filler are to be replaced.
[0005]
[Means for Solving the Problems]
In the present invention, when glass fiber in FRP waste is introduced into a melting furnace as a raw material for short glass fiber or rock wool, FRP waste and short glass fiber raw material or rock wool raw material are mixed, and organic matter is pre-combusted and oxidized. And remove. Then, the heat of the material heated in the removal process is put into the melting furnace before it escapes from the waste, and the FRP waste is effectively used by making the best use of the effect of preheating.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, FRP waste refers to FRP products using glass fibers, injection molded products or scraps, shards, defective products or FRP bathtubs, leisure boats, fishing boats, structures produced in these manufacturing processes. It means that glass fiber remains even if it is incinerated with a product using resin, such as a crushed product that is no longer needed after its useful life has elapsed.
As FRP waste is used from a raw material storage hopper, it is supplied to the incinerator using a known removal method and transportation method, so that a bridging phenomenon occurs in the hopper by a known FRP product crushing and pulverization method. It is preferable to use a form that can be easily removed. The equipment designer considers the hopper shape depending on the raw materials used. For example, if it is FRP, the length of one side can be set to 5 cm or less, preferably 1 cm or less. You can also
These FRP wastes can be incinerated with FRP wastes alone or mixed with short glass fibers or rock wool raw materials for incineration.
[0007]
Since the combustion heat of FRP waste can be used effectively for preheating the raw material, it is desirable to mix and incinerate short glass fiber or rock wool raw material and FRP waste, but only FRP waste It can also be fired. In that case, the fired product can be put into a melting furnace separately from the short glass fiber or rock wool material, or can be added after mixing with the raw material.
Various well-known industrial waste incinerators that are usually used can be used as incineration means for heating these FRP wastes to remove organic substances. For example, an incinerator such as a moving floor type or a rotary kiln type can be used for a large type, and a direct fire type or a dry distillation type can be used for a small type. These furnaces are preferably equipped with an auxiliary heating device such as a gas burner.
The incineration means is not particularly limited as long as it has a function of efficiently burning a material containing an organic substance and easily taking out the heated material without cooling. However, as a means for continuously incinerating a large amount of raw materials containing FRP waste, a continuous firing type heating furnace is preferable, and after injecting the organic material of the input raw materials, it is possible to supply the molten material to the melting furnace. is there.
[0008]
During the process of oxidizing and removing organic matter by heating FRP waste in an incinerator, it is desirable that the carbon content be 0.5% by weight or less in a short time, and the raw material for short glass fibers should be further reduced. Is desirable.
The higher the oxidation temperature, the better for the removal of organic matter, but when the heating temperature increases, the FRP wastes fuse together, confine solid carbon, foam in the molten raw material, and the strength of the manufactured fiber decreases, platinum It tends to cause nozzles and compounds to break down the nozzles. In order to prevent such a situation, the temperature of the portion of the baking furnace until the combustion of organic matter proceeds and the amount of residual carbon decreases is kept below the melting temperature of the glass fiber, or the glass short fiber, or the rock wool raw material and the FRP It is effective to mix calcium carbonate and dolomite powder with 1-5 wt% FRP waste raw material and heat-treat so that it does not mix with waste or adhere to the wall of the furnace.
When the heat generation amount of the FRP waste to be used is insufficient, it is possible to increase the preheating temperature of the raw material by blending granular coal, coke and the like.
[0009]
The heating temperature is about 450.degree. C., preferably 600.degree. C. or higher, at which oxidation takes place rapidly. The higher temperature can be processed at a temperature up to about 1200.degree. C. when mixed and heated with the rock wool raw material. . The heating temperature is appropriately determined in consideration of the amount of FRP waste, the amount of organic matter contained, and the ratio of other raw materials blended into the FRP waste.
The major factors that determine the conditions are the heating temperature at which the oxidation can be carried out completely as much as possible, and the amount of raw material supplied.
[0010]
The fired high-temperature material is immediately put into a rock wall or a short glass fiber raw material melting furnace before being cooled. Depending on the firing conditions, the raw material may melt into large lumps, and after calcination, such lumps need to be finely crushed by a crushing means such as a known roll crusher.
In the present invention, after oxidizing and removing organic substances in an incinerator, immediately putting it into a short glass fiber or rock wool raw material melting furnace means that the change in the liquid level of the melting furnace is minimized. A small hopper that is directly insulated from the opening of the FRP waste heating furnace through the opening provided in the upper part of the melting furnace or insulates the surroundings in order to adjust fluctuations in the amount of the baked raw material that comes out of the incineration. In the melting furnace, the heat of the calcined material can be used so that the FRP waste is temporarily retained and cooled before being put into the melting furnace by a known raw material transportation method such as a screw feeder. It means to throw in.
[0011]
【Example】
EXAMPLES The present invention will be described below with reference to examples, but it is a specific illustration of the idea of the invention and is not limited to this application and this method.
[0012]
As raw materials, 20% by weight of FRP scraps having an average length of 1 cm on one side cut and crushed by a boat for lager manufactured by the hand lay-up method and rock wool shot scraps (generated in the production of rock wool) Non-fiber) and 80% by weight of pebble-like rock wool material were used.
The mixture was supplied to the moving bed incinerator 1 at a rate of 1 ton for 1 hour, and a gas burner was used as an auxiliary heating device and the furnace was operated at a maximum temperature of 800 ° C. to remove organic substances.
[0013]
The raw material having an organic content of 0.3% by weight or less is supplied to an electric furnace 3 equipped with three graphite electrodes for dissolving a rock wool raw material by means of a heat-resistant metal transportation means 2 installed at the incinerator outlet. Supplied. The supply amount is controlled by a measuring instrument (not shown) provided in a part of the feeder.
The heated raw material melted in the electric furnace 3 is supplied to a rock wool fiberizer 4 having a heat-resistant metal spinner which is rotated at high speed by a feeder in a molten state at a temperature of 1450 ° C. Rock wool fiber was formed by force.
[0014]
【The invention's effect】
According to the present invention, conventionally discarded FRP waste can be used as a raw material for short glass fiber or rock wool, and not only industrial waste is reduced,
This is an effective resource recycling method that combines the economic effect of energy saving that the energy of FRP waste generated in large quantities in the future can be used to preheat short glass fiber or rock wool raw material.
In addition, since the incinerator that burns organic matter and the melting furnace that melts the raw material to be fiberized are separated without directly putting the FRP waste into the melting furnace, the resin content and blending amount of the FRP waste fluctuate. However, it is easy to control the amount of carbon remaining in the waste by operating the incinerator under appropriate conditions according to the conditions. Regardless of the temperature conditions of the melting furnace, conditions such as the firing temperature can be changed, so there is an advantage that the melting state of the melting furnace is not affected.
If a preheated raw material supply hopper insulated between the incinerator and the melting furnace is provided, the raw material supply can be adjusted according to the conditions of the incinerator and the melting furnace without cooling the preheated raw material.
[Brief description of the drawings]
FIG. 1 shows an embodiment of the present invention.
[Explanation of symbols]
1, moving bed incinerator 2, transportation means 3 for supplying FRP waste fired material to the furnace, electric melting furnace 4 using a graphite electrode for producing rock wool, fiberizing apparatus

Claims (1)

And the FRP waste, mixed with glass short維繊material or rock wool material, after heating to remove oxidized organics incinerator, the FRP waste immediately charged into the glass wool material melting furnace or a rock wool material melting furnace Processing method.

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