WO2019008685A1

WO2019008685A1 - Method for processing carbon fiber-reinforced plastic

Info

Publication number: WO2019008685A1
Application number: PCT/JP2017/024549
Authority: WO
Inventors: 雄哉佐野; 香奈宮武
Original assignee: 太平洋セメント株式会社
Priority date: 2017-07-04
Filing date: 2017-07-04
Publication date: 2019-01-10
Also published as: JPWO2019008685A1; CN110719930A; JP6892509B2

Abstract

Provided is a method for processing carbon fiber-reinforced plastic whereby carbon fiber-reinforced plastic can be sufficiently burned using less effort. Carbon fiber-reinforced plastic is placed in contact with a surfactant and an acid solution, then incinerated.

Description

Method of treating carbon fiber reinforced plastic

The present invention relates to a method of burning and treating waste plastic containing carbon fiber.

In recent years, as a lightweight and high-strength structural material, the demand for a composite material formed of a matrix material such as a resin or metal and a carbon compound has dramatically increased. In particular, the increase in demand for carbon fiber reinforced plastics (CFRP) in which a matrix material made of a thermosetting resin or a thermoplastic resin and a carbon fiber are composited is remarkable. On the other hand, with the increase in demand, the amount of waste containing carbon fiber reinforced plastic is also increasing.

As a method of treating such carbon fiber reinforced plastic, there is a method of incinerating and treating it in a cement manufacturing process while being effectively used as an alternative fuel.

However, when the carbon fiber reinforced plastic is incinerated and treated, carbon fibers contained in the plastic may be burned off and the burned carbon fibers may be mixed in the exhaust gas. As a result, there has been a problem that there may be a failure (electric short circuit accident, damage to the filter, etc.) caused by carbon fibers adhering to exhaust gas dust collection equipment (electrostatic dust collector, bag filter, etc.).

As a method to avoid such problems, there is a method of removing carbon fiber from carbon fiber reinforced plastic before performing treatment by cement manufacturing process, but it is very complicated to perform pretreatment in advance. Met.

Therefore, as a treatment method capable of omitting the process of removing carbon fibers in advance, the crushed carbon fiber reinforced plastic is crushed so that the average particle diameter of the carbon fiber reinforced plastic is 3 mm or less, and the crushed carbon fiber reinforced plastic is cement kiln The method of supplying to the position whose internal temperature of is 1200 degreeC or more is proposed (for example, refer patent document 1).

Unexamined-Japanese-Patent No. 2007-131463

However, in the method described in Patent Document 1, it is necessary to finely grind a high-strength carbon fiber reinforced plastic into extremely small particles having an average particle diameter of 3 mm or less, which requires a large amount of labor for the pulverization. There was a problem of becoming

The present invention has been made in view of the above points, and an object of the present invention is to provide a method of treating carbon fiber reinforced plastic which can burn the carbon fiber reinforced plastic sufficiently with little effort.

In order to achieve the above object, the method of treating carbon fiber reinforced plastic of the present invention is a method of treating carbon fiber reinforced plastic which burns carbon fiber reinforced plastic, which comprises the carbon fiber reinforced plastic, surfactant, and acid. After contacting with a solution, the carbon fiber reinforced plastic is incinerated.

In the method of treating carbon fiber reinforced plastic of the present invention, the surfactant improves the wettability of the carbon fiber reinforced plastic, and the acid solution is in sufficient contact with the carbon fiber reinforced plastic. And, at the time of incineration, the acid solution and the carbon fiber reinforced plastic react efficiently, and the thermal deterioration accompanied by the oxidative deterioration is promoted, so the flammability of the carbon fiber reinforced plastic is sufficiently enhanced.

Therefore, according to the method for treating a carbon fiber reinforced plastic of the present invention, it is not necessary to remove the carbon fiber in advance, and the average particle diameter of the carbon fiber reinforced plastic is not reduced to an extremely small size such as 3 mm or less. As it may be, the carbon fibers contained in the carbon fiber reinforced plastic can be sufficiently burned with less labor.

In the method for treating a carbon fiber reinforced plastic of the present invention, the carbon fiber reinforced plastic is brought into contact with the surfactant to reduce its diameter, and the acid solution is further brought into contact with it, and then the carbon fiber reinforced plastic is incinerated. Is preferred. In this embodiment, the carbon fiber reinforced plastic is brought into contact with a surfactant to reduce its diameter, and therefore, when the carbon fiber reinforced plastic is made smaller in diameter or dust is generated after the carbon fiber reinforced plastic is made smaller by the surfactant. It can be suppressed.

In the method for treating carbon fiber reinforced plastic of the present invention, the amount of the acid solution is 10 parts by mass or more and 200 parts by mass or less, based on 100 parts by mass of the carbon fiber reinforced plastic. preferable. When the amount of the carbon fiber reinforced plastic is 100 parts by mass and the amount of the acid solution is less than 10 parts by mass, the effect of improving the flammability of the carbon fiber reinforced plastic may not be obtained sufficiently. On the other hand, in the case where the amount of the acid solution is more than 200 parts by mass, even if the amount of the acid solution is increased, the effect of improving the flammability of the carbon fiber reinforced plastic becomes insufficient.

In the method for treating a carbon fiber reinforced plastic of the present invention, the amount of the surfactant is 0.5 parts by mass or more and 10 parts by mass or less when the amount of the acid solution is 100 parts by mass. Is preferred. When the amount of the acid solution is 100 parts by mass and the amount of the surfactant is less than 0.5 parts by mass, the effect of improving the combustibility of the carbon fiber reinforced plastic may not be obtained sufficiently. On the other hand, the upper limit of the amount of surfactant is not limited from the viewpoint of improving the flammability of the carbon fiber reinforced plastic. However, from the viewpoint of drug cost and the like, when the amount of the surfactant solution is 10 parts by mass when the amount of the acid solution is 100 parts by mass, the cost is undesirably increased.

Moreover, in the processing method of the carbon fiber reinforced plastic of this invention, it is preferable that the average particle diameter of the said carbon fiber reinforced plastic is 10 mm or less. The effect of improving the flammability can be obtained without extremely reducing the average particle size of the carbon fiber reinforced plastic, but if the average particle size is reduced to about 10 mm, the effect is particularly enhanced.

Further, in the method for treating a carbon fiber reinforced plastic of the present invention, after the carbon fiber reinforced plastic is brought into contact with a surfactant and an acid solution, the carbon fiber reinforced plastic is incinerated in a cement manufacturing facility. It is also good.

It is a graph which shows the result of the thermal weight curve of Example 1-2 in Comparative Example 1 and Comparative example 1-2, a vertical axis shows a weight loss rate (mass%) of a sample, a horizontal axis shows heating temperature (° C) Indicates

The present invention relates to a method of treating carbon fiber reinforced plastic by burning the carbon fiber reinforced plastic for treatment.

In the treatment method of the present invention, a carbon fiber reinforced plastic is brought into contact with a surfactant and an acid solution.

The surfactant may be one or more selected from various anionic, nonionic and cationic surfactants, and in particular, anionic or nonionic surfactants are preferably used.

Examples of anionic surfactants include sodium alkyl ether sulfate, sodium alkyl sulfate, sodium linear alkyl benzene sulfonate (LAS), sodium fatty acid, potassium fatty acid, sodium alpha sulfo fatty acid ester, sodium alpha olefin sulfonate, Examples include sodium alkyl sulfonate and the like.

Examples of nonionic surfactants include sucrose fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, fatty acid alkanolamide, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether and the like.

The amount of the surfactant is 0.05 to 20 parts by mass, preferably 0.5 to 10 parts by mass, and more preferably 0 when the amount of the carbon fiber reinforced plastic is 100 parts by mass. .5 to 5 parts by mass.

The amount of surfactant is 0.5 to 10 parts by mass, preferably 0.5 to 5 parts by mass, and more preferably 0 when the amount of the acid solution is 100 parts by mass. .5 parts by mass or more and 3 parts by mass or less.

If the amount of surfactant is not within the above range, the effect of improving the flammability of the carbon fiber reinforced plastic may not be obtained sufficiently.

The pH of the acid solution used in the present invention is preferably 4 or less, more preferably 2 or less, particularly preferably less than 1, and the purity and the like are not particularly limited, and those generally available can be used. It may be used. Therefore, for example, waste acids having a pH of 4 or less can also be used effectively.

The amount of the acid solution is 10 parts by mass to 200 parts by mass, preferably 10 parts by mass to 100 parts by mass, more preferably 10 parts by mass to 50 parts by mass, based on 100 parts by mass of the carbon fiber reinforced plastic. Part or less.

Regarding the lower limit of the amount of the acid solution, when the amount of carbon fiber reinforced plastic is 100 parts by mass, the effect of improving the flammability of the carbon fiber reinforced plastic is sufficiently obtained when the amount of the acid solution is less than 10 parts by mass. I can not do it.

There is no limitation on the upper limit of the amount of the acid solution from the viewpoint of improving the flammability of the carbon fiber reinforced plastic. However, when the amount of the carbon fiber reinforced plastic is 100 parts by mass from the viewpoint of drug cost etc., if the amount of the acid solution exceeds 200 parts by mass, the cost increases, which is not preferable.

In the treatment method of the present invention, the method of bringing the carbon fiber reinforced plastic into contact with the surfactant and the acid solution is not particularly limited. That is, the carbon fiber reinforced plastic may be allowed to act on the surfactant and the acid solution. Specifically, for example, a surfactant and / or an acid solution may be dropped, sprayed, applied, etc. to a carbon fiber reinforced plastic, and operations such as mixing, stirring etc. are performed along with it if necessary. May be Alternatively, the carbon fiber reinforced plastic may be impregnated with a solution containing a surfactant and / or an acid solution, and if necessary, the carbon fiber reinforced plastic may be shaken while being shaken. Alternatively, the carbon fiber reinforced plastic may be allowed to stand still under the atmosphere in which the surfactant and / or the acid solution is vaporized, or the carbon fiber reinforced plastic may be exposed under the atmosphere while being shaken. You may More typically, it may be, for example, a method of configuring an environment where thermal decomposition of the acid solution occurs around the carbon fiber reinforced plastic inside the incinerator.

The surfactant and the acid solution may be used in a mixed state or in different forms. When both are used in a mixed state, the mixing method is not particularly limited, and any common method may be used as a liquid mixing method. For example, after adding a predetermined amount of surfactant to an acid solution having a large mixing ratio, mixing may be performed by stirring. Also, an aqueous solution containing both of them may be prepared and used. On the other hand, even when the surfactant and the acid solution are used in different forms, the form of the aqueous solution can be separately prepared and used. However, when preparing an aqueous solution containing a surfactant, it is prepared by adding 0.1 part by mass to 30 parts by mass of the surfactant to 100 parts by mass of water from the viewpoint of not increasing the viscosity of the aqueous solution. It is preferable that it is prepared by adding 1 part by mass to 10 parts by mass.

Moreover, there is no restriction | limiting in particular about the timing which contacts surfactant and an acid solution with a carbon fiber reinforced plastic. That is, for example, the carbon fiber reinforced plastic may be put into the facility for incineration, may be at the same time as the put in, or may be put in after the put in place. In addition, even when the surfactant and the acid solution are used in different forms, there is no particular limitation on the timing of contacting them with the carbon fiber reinforced plastic. That is, the surfactant may be brought into contact with the carbon fiber reinforced plastic prior to the acid solution, or may be brought into contact simultaneously, or the surfactant may be brought into contact with the carbon fiber reinforced plastic after the acid solution. However, from the viewpoint of imparting sufficient wettability to the carbon fiber reinforced plastic, it is preferable to contact the surfactant with the carbon fiber reinforced plastic prior to the acid solution.

On the other hand, in another embodiment of the present invention, a carbon fiber reinforced plastic is brought into contact with a surfactant to reduce its diameter, and this is further brought into contact with an acid solution. According to this, the combustion improvement effect is further enhanced by the reduction in diameter. In addition, when the carbon fiber reinforced plastic is made smaller in diameter, or dust generation after the carbon fiber reinforced plastic is made smaller is suppressed by the surfactant.

Also in the above embodiment, there is no particular limitation on the timing of contacting the surfactant and the acid solution with the carbon fiber reinforced plastic. That is, for example, the carbon fiber reinforced plastic may be put into the facility for incineration, may be at the same time as the put in, or may be put in after the put in place. More specifically, for example, after dropping a surfactant and an acid solution onto a carbon fiber reinforced plastic with reduced diameter, or after impregnating the carbon fiber reinforced plastic with a solution containing a surfactant and an acid solution Alternatively, after the acid solution is dropped onto the carbon fiber reinforced plastic made small by dripping the surfactant, or after the carbon fiber reinforced plastic made small by impregnating the surfactant into the acid solution, it is incinerated It may be a method of charging them into the equipment, or when charging the carbon fiber reinforced plastic reduced in diameter into the incineration equipment or after injecting it, spray the surfactant and the acid solution inside the incineration equipment. After contacting the carbon fiber reinforced plastic in contact with them in the inside of the incinerator or dropping the surfactant and introducing the carbon fiber reinforced plastic into the incinerator, the acid solution is put in the inside of the incinerator. And fog, may be a method of contacting them within the incinerator.

Hereinafter, regarding the method for treating carbon fiber reinforced plastic of the present invention, waste of carbon fiber reinforced plastic (hereinafter referred to as “waste CFRP”) is described in more detail by taking thermal recycling treatment in a cement kiln as an example. explain.

First, waste CFRP, which is an object to be treated, will be described. Carbon fiber reinforced plastics (CFRP) is a structural material which is light in weight but is very excellent in mechanical properties and corrosion resistance. The carbon fiber content is generally about 30% by mass to 80% by mass. In addition, the content rate of the carbon fiber of CFRP can be calculated | required by the test method based on JISK 7075 "The fiber content rate and the void rate test method of a carbon fiber reinforced plastic."

As carbon fibers used in CFRP, fibers formed from graphitic carbon and having excellent mechanical properties such as rigidity are used. Specifically, as carbon fibers, for example, polyacrylonitrile-based, pitch-based or cellulose-based fibers and the like are heated to 150 ° C. to 400 ° C. in an oxidizing atmosphere to perform a flameproofing treatment, and then in an inert atmosphere. In addition to those obtained by carbonization or graphitization at 300 ° C. to 2500 ° C., activated carbon fibers activated in a semi-active atmosphere such as water vapor and the like can be mentioned.

As a matrix material used for CFRP, a thermoplastic resin or a thermosetting resin is used. Specifically, examples of the thermoplastic resin include polyamide resin, or polypropylene resin, nylon resin, and the like. Moreover, as a thermosetting resin, an epoxy resin, unsaturated polyester resin, a polyimide resin, bismaleimide resin, a phenol resin etc. are mentioned, for example.

In the present embodiment, first, waste CFRP, which is a waste of CFRP comprising the above-mentioned components, is crushed to 50 mm or less by a crushing apparatus such as a rotary cutter shear crusher, and then a jaw crusher and a roll mill. The diameter is reduced to a predetermined size by crushing equipment such as a roller mill and a crusher. In addition, in order to efficiently carry out the grinding operation of the hard CFRP, it is preferable to attach a classification device such as a separator to the grinding equipment at the latter stage.

Here, the average particle size of the waste CFRP after the treatment for reducing the diameter is obtained by drying those after the treatment for reducing the diameter and using the sieve specified in JIS Z 8801 "Sieve for test-Part 1: Metal mesh sieve" It can be determined by sifting and calculating the diameter corresponding to 50% by mass of the sample remaining on the sieve.

In the treatment method of the present invention, it is not always necessary to make the diameter reduction that requires excessive labor, but in order to perform the treatment efficiently, it is preferable to reduce the waste CFRP to a certain extent. Specifically, it may be 10 mm or less, preferably 7 mm or less.

Next, the waste CFRP reduced in diameter is brought into contact with the surfactant and the acid solution. As the method of this contact, as described above, it is sufficient that the environment in which the thermal decomposition of the acid solution occurs around the waste CFRP is configured in the inside of the cement kiln. Furthermore, in reducing the size of waste CFRP, the size of waste CFRP to which a surfactant is dropped is reduced to obtain waste CFRP containing a surfactant, and the waste CFRP containing the surfactant is then brought into contact with an acid solution. Good.

Specifically, for example, after the surfactant and the acid solution are dropped to the waste CFRP having a reduced diameter, or after the waste CFRP having a reduced diameter is impregnated into the surfactant and the acid solution, or a surfactant is added, for example Alternatively, the acid solution may be dropped to the waste CFRP having a reduced diameter, or the waste CFRP having a reduced diameter may be impregnated with the acid solution after the surfactant is dropped, and then these may be added to the cement kiln. After charging the waste CFRP into a cement kiln, spray the surfactant and acid solution inside the cement kiln to bring them into contact with the inside of the cement kiln, or drip the surfactant The waste CFRP having a reduced diameter may be introduced into the incinerator, and then the acid solution may be sprayed into the inside of the incinerator to bring them into contact with the inside of the incinerator. There is no particular limitation on the position of the waste CFRP to be introduced into the cement kiln, and it may be from the weir front side (kiln burner side), from the weir end side, or from the calciner.

However, since the acid solution thermally decomposes immediately when it is put into the cement kiln, waste CFRP and waste CFRP should be used when using a method of contacting the inside of the cement kiln in order to efficiently utilize the effect of improving the flammability by the acid solution. It is preferable to introduce the surfactant and the acid solution into the cement kiln simultaneously or substantially simultaneously from a common or very near location.

Specifically, for example, while installing a first blowing port for waste CFRP in a kiln burner etc., only a surfactant and an acid solution, or an acid solution so as to be adjacent to the first blowing port The second blowing port may be installed.

Finally, waste CFRP is heated inside the cement kiln with the surfactant and acid solution in contact with it. The heating temperature is preferably set to a temperature exceeding the combustion temperature range (500 ° C. to 800 ° C.) of fixed carbon. Here, fixed carbon refers to a carbon compound present in a form that does not volatilize in a carbon fiber reinforced plastic, and includes carbon fibers and the like contained in waste CFRP.

In the present embodiment, an example of a cement kiln which is a cement production facility is described as an incineration facility for carbon fiber reinforced plastic, but in the treatment method of the present invention, an incineration facility other than a cement kiln may be used. Of course.

Next, test results according to the treatment method of the present invention (that is, an embodiment of the treatment method of the present invention) will be described.

[Test Example 1]
The effect of surfactant and acid solution on the flammability of carbon fiber reinforced plastic by making the size of carbon fiber reinforced plastic constant and conducting tests by changing the amount of surfactant and pH and amount of acid solution Was evaluated.

Specifically, the test levels shown below were set.
Carbon fiber reinforced plastic: Waste CFRP (carbon fiber content: 58% by mass)
Waste CFRP sample size: average particle size 1 mm
Acid solution a: HNO ₃ solution of pH 0.6 (69% HNO ₃ solution)
Acid solution b: pH 2 HNO ₃ solution (adjusted by diluting acid solution 1)
Acid solution c: HNO ₃ solution of pH 4 (adjusted by diluting acid solution 1)
Acid solution d: HNO ₃ solution of pH 6 (adjusted by diluting acid solution 1)
Surfactant: Linear alkyl benzene sulfonate sodium, linear alkyl benzene sulfonic acid, and alkyl ether sulfate sodium mixture (manufactured by Lion Corporation: Mama Lemon (trade name))
Method of using surfactant and acid solution: Tests were conducted at ten test levels of Examples 1 to 8 and Comparative Examples 1 and 2 shown below.
Example 1: Assuming a condition in which a carbon fiber reinforced plastic is exposed in an atmosphere in which a surfactant and an acid solution are vaporized, the waste CFRP (100 parts by mass) without impregnating the waste CFRP in advance with the acid solution Mixed solution a consisting of surfactant (0.08 parts by mass) and acid solution a (12.5 parts by mass) (0.64 parts by mass of surfactant per 100 parts by mass of acid solution a) 12.58 parts by mass of the mixed solution a obtained above was dropped and simultaneously heated.
Example 2: Assuming that the carbon fiber reinforced plastic is impregnated with a surfactant and an acid solution and then burned, waste CFRP is added in advance with 0.64 parts by weight of surfactant per 100 parts by weight of acid solution a. After impregnating the resulting mixture solution a, the drained waste CFRP was heated. (The mixed solution a attached to the waste CFRP during heating was 13.5 parts by mass with respect to 100 parts by mass of the waste CFRP.)
Example 3 Example 1 was repeated except that the acid solution a was changed to the acid solution b.
Example 4 Example 2 was repeated except that the acid solution a was changed to the acid solution b.
Example 5 Example 1 was repeated except that the acid solution a was changed to the acid solution c.
Example 6: The same procedure as in Example 2 was performed except that the acid solution a was changed to the acid solution c.
Example 7 The same procedure as in Example 1 was performed except that the acid solution a was changed to the acid solution d.
Example 8 The procedure of Example 2 was repeated except that the acid solution a was changed to the acid solution d.
Comparative Example 1: Only waste CFRP was heated without using a surfactant and an acid solution.
Comparative Example 2: Assuming that the carbon fiber reinforced plastic is exposed in an atmosphere in which only the acid solution is vaporized, the waste CFRP (100 parts by mass) is surrounded without being impregnated with the acid solution in advance. Acid solution a (12.5 parts by mass) was dropped and heated at the same time.

The samples were heated at a heating rate of 10 ° C./min at all test levels, and the weight loss was measured in the temperature range of 150 to 1000 ° C. The weight reduction rate was measured using a thermogravimetric / differential heat measurement apparatus (manufactured by Netti Japan Co., Ltd .: TG-DTA 2020SR (trade name)).

Regarding the thermogravimetric curve obtained at each test level, the weight of fixed carbon (the mass at the start point of the slow gradient in the thermogravimetric curve at 500 ° C. to 600 ° C., and the point at which the weight loss near 800 ° C. does not occur In the difference with weight), the weight reduction rate (mass%) at a predetermined temperature was calculated, where the weight of the fixed carbon was 100%. The results are shown in Table 1.

As a result, as shown in Table 1, it was revealed that the flammability is improved by performing the treatment of bringing the carbon fiber reinforced plastic into contact by combining the surfactant and the acid solution. In particular, when treated with an acid solution of pH 4 together with a surfactant (Examples 5 and 6), in the case of no treatment (Comparative Example 1) or in the case of only treatment of an acid solution of pH 0.6 (Comparative Example 2). In comparison, at 650 ° C., there was approximately twice the flammability, and at 700 ° C., approximately 1.4 times the flammability was obtained. Furthermore, as shown in the results of Examples 1 to 4, it was revealed that the lower the pH of the acid solution used, the better the flammability can be obtained.

In addition, the result of the thermogravimetric curve of Example 1, 2 and Comparative Example 1, 2 is shown in FIG. 1 for reference. Of the three regions where weight loss occurs in the weight loss curve in FIG. 1, two regions on the low temperature side (regions corresponding to 300 to 400 ° C. and regions corresponding to 450 to 550 ° C.) are mainly resin Weight loss due to combustion of volatile carbon, etc., and the weight loss region on the highest temperature side (region of 550 ° C. or more) is weight loss mainly due to combustion of fixed carbon such as carbon fiber. Therefore, it can be seen from FIG. 1 that the method of the present invention (Examples 1 and 2) also promotes the flammability of fixed carbon thereafter by promoting the flammability of the resin.

[Test Example 2]
Next, the burning rate was evaluated when the average particle size of the carbon fiber reinforced plastic was changed.

Using the same waste CFRP as in Test Example 1 above, five types of samples having an average particle diameter of 16 mm, 9.5 mm, 6.7 mm, 4.75 mm, and 2.8 mm were prepared as the samples of this test.

The method of using the surfactant and the acid solution for waste CFRP was the same as Example 2 of Test Example 1 above. That is, after impregnating the waste CFRP into the mixed solution a obtained by adding 0.64 parts by mass of the surfactant to 100 parts by mass of the acid solution a in advance, the drained waste CFRP was used.

The sample impregnated with the above mixed solution a is heated for 3 minutes in an electric furnace in an air atmosphere set at a temperature of 1400 ° C., and fixed carbon (carbon fiber) remaining without burning in the sample after heating We evaluated the residual rate of This heating condition is a condition that simulates the case where combustion treatment is performed by introducing it into the front of the cement kiln.

The evaluation of the burning rate is that all samples after electric furnace heating are regarded as fixed carbon, and the weight of fixed carbon contained in unheated waste CFRP from the measured value of the amount of remaining sample after heating (carbon fiber content: 58 The mass residual rate (%) at the time of mass% being 100% was calculated. The results are shown in Table 2.

As a result, as shown in Table 2, when the average particle diameter is 10 mm or less, preferably 7 mm or less, it is clear that the effect of improving the flammability is greater.

Claims

A method of treating carbon fiber reinforced plastic by burning carbon fiber reinforced plastic,
A method of treating a carbon fiber reinforced plastic, comprising contacting the carbon fiber reinforced plastic with a surfactant and an acid solution having a pH of 4 or less and then incinerating the carbon fiber reinforced plastic.
In the method for treating a carbon fiber reinforced plastic according to claim 1,
A method of treating a carbon fiber reinforced plastic comprising contacting the surfactant with the carbon fiber reinforced plastic to reduce the diameter thereof, and further bringing the carbon fiber reinforced plastic into contact with the acid solution, after which the carbon fiber reinforced plastic is incinerated.
In the method for treating a carbon fiber reinforced plastic according to claim 1 or 2,
The amount of the acid solution having a pH of 4 or less is 10 parts by mass or more and 200 parts by mass or less when the amount of the carbon fiber reinforced plastic is 100 parts by mass. Processing method.
The method for treating a carbon fiber reinforced plastic according to any one of claims 1 to 3.
The carbon fiber reinforced plastic is characterized in that the amount of the surfactant is 0.5 parts by mass or more and 10 parts by mass or less when the amount of the acid solution having a pH of 4 or less is 100 parts by mass. How to handle
In the processing method of the carbon fiber reinforced plastic according to any one of claims 1 to 4,
The average particle diameter of said carbon fiber reinforced plastic is 10 mm or less, The processing method of the carbon fiber reinforced plastic characterized by the above-mentioned.
In the processing method of the carbon fiber reinforced plastic according to any one of claims 1 to 5,
A method of treating a carbon fiber reinforced plastic, comprising contacting the carbon fiber reinforced plastic with the surfactant and the acid solution, and then burning the carbon fiber reinforced plastic in a cement manufacturing facility.