JP2016147437A - Method for treating resin waste, and system for treating resin waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for treating a resin waste capable of efficiently treating a resin waste without blocking an operation of a cement facility even when using a resin waste containing a carbon fiber as a fuel.SOLUTION: A method for treating a resin waste containing a carbon fiber includes: a heating and separation step of heating a resin portion of the resin waste and separating a carbon fiber; and a collection step of subjecting a scattering substance containing the carbon fiber generated in the heating and separation step to filter treatment, and collecting the scattering substance.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for treating resin waste containing carbon fibers and a system for treating resin waste containing carbon fibers.

  In recent years, cement production facilities have been using them as raw fuel in order to effectively use wastes such as construction generated soil, sludge, dust, food waste, and plastic waste. In particular, scrapped automobile shredder dust (ASR: Automobile Shredder Residue) is generated in large quantities year by year, and the need for efficient treatment is increasing.

  Waste car shredder dust is a residue obtained by cutting and scrapping a used car at a recycling plant with a large cutter, and separating and recovering valuable materials such as iron through a magnetic separator, etc., mainly organic synthetic polymer materials such as plastic, rubber, and sponge. Combustible materials and inorganic materials such as glass. In recent years, carbon fiber reinforced plastics (CFRP: Carbon Reinforced Plastics), carbon fiber reinforced plastics (FRP: Fiber Reinforced Plastics), carbon containing carbon fiber as a component, carbon Fiber reinforced thermosetting resins (CFRTS: Carbon Fiber Reinforced Thermosets) and carbon fiber reinforced thermoplastic resins (CFRTP: Carbon Fiber Reinforced Thermoplastics) have come to be used (for example, see Patent Document 1).

In general, when waste car shredder dust is processed in a cement manufacturing facility, in general, as with other industrial wastes, these combustible wastes are used as fuels such as calcining furnaces and kiln bottoms at about 700 to 1300 ° C. It is thrown into the combustion field. Conventionally, detailed examination of the charging position (for example, see Patent Document 2) and examination of the combustion atmosphere (for example, see Patent Document 3) have been performed.
However, in recent years, when processing resin members using carbon fibers to these scrapped car shredder dust, discharges caused by carbon fibers in the electrostatic precipitator of the exhaust gas treatment facility have caused obstacles to the operation of cement production, such as the electric precipitator stopping. Turned out to cause. Although a general resin member is heat-treated in a combustion field, some carbon fibers do not burn in the above temperature range, and carbon fibers that do not burn pass through the preheater together with exhaust gas. Since carbon fibers are fibrous, they can be entangled in various devices and pipes and can cause problems that impede the operation of cement equipment. In particular, stopping the electrostatic precipitator leads to a serious accident.

JP 2013-212730 A Japanese Patent No. 5121141 Japanese Patent No. 4948429

  Therefore, in the present invention, even when resin waste containing carbon fiber is used as a fuel, a resin waste treatment method and resin waste that can efficiently treat the resin waste without hindering the operation of the cement facility. The object is to provide a material processing system.

  As a result of earnest research to solve the above problems, the present inventors have found that the problems can be solved by filtering the scattered matters containing carbon fibers generated after the heat treatment and collecting the scattered matters. The headline and the present invention were completed. That is, the present invention is as follows.

[1] A method for treating resin waste containing carbon fiber, the heating / separation step of separating the carbon fiber by heating the resin portion of the resin waste, and the heating / separation step A method for treating resin waste, comprising: a step of filtering the scattered matter containing carbon fiber to collect the scattered matter.
[2] The method for treating resin waste according to [1], wherein the heating in the heating / separation step is at least one of a preheater, a calciner, a kiln bottom, and a rotary kiln of a cement manufacturing apparatus.
[3] The resin waste processing method according to [1] or [2], wherein the filter process in the collecting step is a process using a bag filter.
[4] The resin waste treatment method according to any one of [1] to [3], wherein an electrostatic dust collection treatment is performed after the filter treatment.
[5] The method for treating resin waste according to any one of [1] to [4], wherein the resin waste containing carbon fibers is automobile shredder dust.
[6] A treatment system for treating resin waste containing carbon fiber, the heating means for heating the resin portion of the resin waste by heating, and filtering the scattered matter containing the carbon fiber generated after the heating And a recovery means for recovering the scattered matter.
[7] The resin waste treatment system according to [6], wherein the collection unit is a bag filter.
[8] The resin waste treatment system according to [6] or [7], further including an exhaust chimney and an electric dust collector, wherein the electric dust collector is between the exhaust chimney and the collecting means.

  ADVANTAGE OF THE INVENTION According to this invention, even if it uses the resin waste containing carbon fiber as a fuel, the processing method of the resin waste which can process the said resin waste efficiently, without inhibiting the operation of cement equipment, and resin disposal An object processing system can be provided.

It is the schematic which shows one form of the processing system of the resin waste containing carbon fiber.

[1. Treatment method of resin waste containing carbon fiber]
First, composite materials using carbon fibers include carbon fiber reinforced plastics and carbon fiber reinforced carbon composite materials. Carbon fiber is rarely used as a single material, and is mainly used as a composite material combined with a base material such as a synthetic resin.
The method for treating resin waste containing carbon fiber of the present invention includes a heating step of heating and melting or burning the resin portion, specifically, a preheater, a calcining furnace, a kiln bottom of a cement manufacturing apparatus, and The carbon fiber is separated by melting or burning the resin component of the resin waste containing carbon fiber by charging at least one of the heating field and the combustion field of the rotary kiln.

  As the conditions for the combustion treatment, conditions performed in a cement manufacturing facility are applied. For example, the processing temperature is about 750 to 1050 ° C. (preferably 850 to 950 ° C.) in the calciner, and about 950 to 1250 ° C. (preferably 1000 to 1200 ° C., more preferably 1000 to 100 ° C.) at the kiln bottom. It is.

  In addition, it is preferable to divide the resin waste containing carbon fiber for every predetermined size beforehand. In the treatment method according to the present invention, when the resin component is heated, the resin component melts or burns, and the carbon fiber portion is separated from the resin component without burning. The carbon fiber separated from the resin portion rides on the gas flow and flows to the preheater. And the processing method which concerns on this invention includes the collection | recovery process which filters the scattered material containing carbon fiber, and collect | recovers this scattered material. This step is specifically a step of collecting the carbon fibers scattered by the preheater with a filter.

By such a process, the resin component which is combustible among the resin waste containing carbon fiber will burn as a part of fuel. That is, the resin component is provided as a fuel. There are various types of carbon fibers. Depending on the type, there are those that burn at 600 ° C. or lower, and those that do not burn even at 1450 ° C. However, almost all carbon fibers do not melt at about 1450 ° C. There are PAN type (Polyacrylonitrile) made by carbonizing acrylic fiber at high temperature, and Pitch type (PITCH) using pitch (by-products such as petroleum, coal, coal tar) as raw materials.・ Some decomposition points are 2000-3500 ° C.
Therefore, scattered matter containing carbon fibers is generated after the combustion treatment. This scattered matter is scattered with the exhaust gas. For example, if it is mixed in an electric dust collector, there arises a problem that electricity is passed through the carbon fiber, and it may become impossible to stop the operation. Moreover, when the scattered matter is scattered in a large amount, it may stay in other equipment or piping, resulting in various problems.
The present invention is particularly effective for resin waste containing PAN-based or pitch-based carbon fibers.

  In the present invention, the scattered matter collecting process for filtering the scattered matter containing the carbon fiber generated after the combustion treatment and collecting the scattered matter is performed. Thereby, since the scattered matter can be removed from the exhaust gas, the subsequent exhaust gas treatment process is not inhibited or the efficiency is not lowered without inhibiting the operation of the cement facility.

  As the scattered matter recovery process, there are a process using a bag filter, a washing process of exhaust gas using a scrubber, a process using a large sedimentation chamber, and the like.

Here, the materials used for the filter cloth of the bag filter are polypropylene, nylon, acrylic, polyester, cotton, wool, heat resistant nylon, polyamide / polyimide, PPS (polyphenylene sulfide), glass fiber, PTFE (polytetrafluoroethylene). And the like, and examples of the filter cloth with a function include a catalyst-carrying filter and an electrostatic filter. Among them, heat resistant nylon, polyamide / polyimide, PPS (polyphenylene sulfide), glass fiber, PTFE (polytetrafluoroethylene) are preferable, and heat resistant nylon, PPS (polyphenylene sulfide), PTFE (polytetrasulfide) are more preferable. Fluoroethylene).
Moreover, examples of the wiping-off method include a pulsation back pressure method, a pulse jet method, and the like. Among these, a suitable wiping-out method is a pulse jet method.

After the filter treatment, it is preferable to perform an electrostatic dust collection treatment. By performing the electric dust collection treatment, the fine dust can be recovered from the treated exhaust gas, and the diffusion of the fine dust from the smoke exhaust facility can be prevented.
The electric dust collection process is performed after the carbon fiber is separated and recovered by the filter process, and therefore no failure due to the carbon fiber occurs.

Resin waste containing carbon fiber includes waste such as scrap car shredder dust, boats, floats, fishing rods, golf clubs, formwork, washstands, bathtubs, indoor members, etc., but resin components as fuel In view of the large-scale processability, waste automobile shredder dust is preferable.
In addition, the carbon fiber in the scrap car shredder waste remains without being burned by heating applied to cement production, but in the present invention, in such a case, the carbon fiber is removed while preventing problems caused by the carbon fiber. Can be separated and recovered. Considering this point of view, waste automobile shredder dust is preferable.

  Here, after scrapping recyclable parts and parts from scrapped automobiles, scrapped car dust is shredded to a size of about 100 mm with a large shredder and shredded into valuable metals by magnetic sorting or hand sorting. It is crushed waste that remains after recovery.

  When throwing away the used vehicle shredder dust into at least one of the preheater and the rotary kiln, it is preferable to adjust the particle size of the used vehicle shredder dust according to the respective input locations.

When put into a preheater (especially a calcining furnace), the particle size (maximum particle size) of the scrapped automobile shredder dust is preferably 15 mm or less, and more preferably 10 mm or less. When putting into the rotary kiln, it is preferable to put into the kiln bottom, and the particle size (maximum particle size) of the scrapped car shredder dust at that time is preferably 40 mm or less, more preferably 30 mm or less.
As a method for dividing each particle size, a known method such as using a sieve can be applied.

Waste automobile shredder dust often contains chlorine-containing resin components such as chlorine-containing plastics such as polyvinyl chloride; chloroprene rubber used as automobile window frames (weather strips). Therefore, if this is directly burned, dioxins may be generated, and corrosion of equipment by hydrogen chloride may become a problem. In addition, since the chlorine content of the cement as a product increases, in the present invention, it is preferable to appropriately perform a desalting treatment.
Examples of the desalting process include a process of washing chlorine-containing waste with water. Or the desalination process which discharge | releases chlorine containing dust and chlorine gas out of the system from cement equipment by extracting high temperature gas between the kiln bottom of a cement equipment and the lowermost cyclone of a preheater is mentioned. By adopting these desalting treatments, it is possible to increase the amount of waste car shredder dust.

According to the resin waste processing method of the present invention, the cement facility can be stably operated even when the resin waste containing carbon fibers that can hinder the operation of the cement facility is used as a fuel.
Moreover, since the scattered matter separated and collected by filtering the scattered matter contains carbon fiber, it can be reused as a reinforcing fiber used for fiber-reinforced concrete or the like. Alternatively, the recovered fiber can be mixed with cement and used as a fiber premix cement used for fiber reinforced concrete or the like.

[2. Resin waste treatment system containing carbon fiber]
FIG. 1 shows an outline of an embodiment of a treatment system for resin waste containing carbon fibers of the present invention. This system is suitable for carrying out the resin waste processing method of the present invention described above. Therefore, the various conditions described below are also applicable to the resin waste processing method of the present invention.

The resin waste treatment system 10 shown in FIG. 1 is charged with resin waste containing carbon fiber in at least one of the preheater 12, the rotary kiln 14, the preheater 12, the calcining furnace 12A, the kiln bottom 13, and the rotary kiln 14. And resin waste charging means 16. In FIG. 1, the resin waste is input to the kiln bottom 13 of the rotary kiln by the resin waste input means 16, but this is an example, and the present invention is not limited to this aspect.
Hereinafter, an example of a processing outline of the resin waste processing system of the present invention will be described with reference to the drawings. In FIG. 1, the solid arrow indicates the flow of the raw material, and the dotted arrow indicates the flow of the exhaust gas.

First, the cement raw material stored in the cement raw material storage 18 is dried and pulverized by a raw material mill (cement raw material drying and grinding machine) 20, passed through a cyclone (cement raw material powder separator) 22, and then stored in the raw material silo 23. The preheater (suspension preheater) 12 is charged. While being heated by the preheater (suspension preheater) 12, the preheater 12 passes through and is sent to the calcining furnace 12A.
In the preheater 12, the raw material is heated at about 300 to 900 ° C., and the raw material is heated at about 800 to 1300 ° C. in the subsequent calcining furnace 12A. The raw material heated in the calcining furnace 12 </ b> A is further subjected to heat treatment in the rotary kiln 14. The clinker thus generated is conveyed to the clinker cooler 26, and then crushed and subjected to a known cement manufacturing process.

  Here, the resin waste containing means 16 is charged with resin waste containing carbon fiber in at least one of the preheater 12, the calcining furnace 12A, the kiln bottom 13, and the rotary kiln 14 by the resin waste charging means 16. The resin component is heated and melted, and a part or all of it is burned and consumed as fuel. Further, since the resin component is melted or burned by heating, the carbon fiber and the resin component are separated.

  When the resin waste is introduced into the calcining furnace 12A by the resin waste throwing means 16, the resin waste having a maximum particle size of 15 mm or less in the range from the ceiling to the bottom of the calcining furnace 12A up to 40%. It is preferable to throw in a thing. In addition, it is preferable to introduce resin waste having a maximum particle size of 40 mm or less in the range from the top of the calciner 12A to the bottom of 40% or more.

  Carbon fiber in resin waste is nonflammable and is not used as fuel, and because it is light, it is scattered in the direction opposite to the raw material supply direction on the flow of exhaust gas generated during combustion (dotted line in the figure) See arrow).

  For example, when the scattered matter containing carbon fibers generated after the combustion treatment is mixed in an electrostatic precipitator, there is a problem that electricity is passed through the carbon fibers, and it may become impossible to stop the operation. Moreover, when the scattered matter is scattered in large quantities, it may adhere or stay in other equipment or piping, which may cause various problems.

Therefore, in FIG. 1, in the flow direction of the exhaust gas, the scattered matter collecting means 28 is provided upstream of the electrostatic precipitator 30, and the scattered matter containing carbon fibers generated after the combustion treatment is filtered to collect the scattered matter. ing.
As a result, only the exhaust gas not containing carbon fiber is sent to the electric dust collector 30, where further dust is collected and finally exhaust gas is discharged from the exhaust chimney 32.

As the scattered matter collecting means 28, a bag filter is preferably used, and a filter made of a heat resistant material is particularly preferable. If it is a bag filter, it is possible to remove not only carbon fiber but also unburned carbon that has not been burned out with coal as fuel, without any obstacles, and an electric dust collector suppresses the operation hindrance due to unburned carbon. be able to. If the dust collection performance of the bag filter is good, the electric dust collector 30 can be stopped or removed.
Here, as the electric dust collector 30, a type in which the rectification method is a silicon type and the number of dust collecting chambers is three can be used. The flow rate of gas passing through the dust collection chamber of this electric dust collector can be operated at about 0.5 to 1.5 m / s.

  A fan (not shown) is provided between the electrostatic precipitator 30 and the exhaust chimney 32, and a function for maintaining the flow rate and flow velocity of the exhaust gas passing through the electrostatic precipitator 30 and the bag filter 28 at a constant value by a control device is provided. May be.

Examples of the cement raw material that can be used in this resin waste treatment system include limestone, clay raw material, siliceous raw material such as silica, iron oxide, and the like obtained by excavating and collecting naturally occurring ores. In addition to finely pulverized and mixed cement raw materials, one or more of wastes including inorganic waste, organic waste, inorganic waste, and organic waste can be used.
As the inorganic waste, coal ash containing residual carbon, blast furnace slag, blast furnace dust, unburned ash, and the like are used, and these inorganic wastes are suitable as substitutes for clay-based raw materials.

  On the other hand, as the organic waste, for example, waste containing organic matter such as waste plastic, waste tire, waste oil and the like is used. These wastes are relatively easy to process among the wastes processed in cement manufacturing facilities. For example, waste plastics, waste tires, etc. are cut or crushed and then used as part of the fuel. Directly charged into the rotary kiln 14 or the calcining furnace 12A and melted and burned.

  According to the resin waste processing system including carbon fibers as described above, cement can be produced while effectively using the resin waste including carbon fibers as fuel. Moreover, the operation of the cement equipment resulting from the carbon fibers is not hindered, and the resin waste can be treated efficiently.

DESCRIPTION OF SYMBOLS 10 ... Processing system 12 ... Preheater 12A ... Calciner 13 ... Kiln bottom 14 ... Rotary kiln 16 ... Resin waste input means 18 ... Cement raw material storage 23 ... Raw material Silo 28 ... Scatter collection means 32 ... Chimney

Claims (8)

  A method for treating resin waste containing carbon fiber, comprising: heating / separating step for separating the carbon fiber by heating a resin portion of the resin waste; and the carbon fiber generated through the heating / separating step. And a recovery step of collecting the scattered matter by filtering the contained scattered matter.   The method for treating resin waste according to claim 1, wherein the heating in the heating / separating step is at least one of a preheater, a calciner, a kiln bottom, and a rotary kiln of a cement manufacturing apparatus.   The resin waste processing method according to claim 1, wherein the filtering process in the collecting step is a bag filter process.   The method for treating resin waste according to any one of claims 1 to 3, wherein an electrostatic dust collection treatment is performed after the filter treatment.   The resin waste treatment method according to any one of claims 1 to 4, wherein the resin waste containing the carbon fiber is automobile shredder dust. A treatment system for treating resin waste containing carbon fiber,
Heating means for heating the resin part of the resin waste by heating;
A collection means for collecting the scattered matter by filtering the scattered matter containing the carbon fiber generated after the heating;
Including resin waste treatment system.   The resin waste treatment system according to claim 6, wherein the collecting means is a bag filter. It has an exhaust chimney and an electric dust collector,
The resin waste treatment system according to claim 6 or 7, wherein the electric dust collector is located between the exhaust chimney and the recovery means.

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