Method of treating demolished building material

Abstract

To effectively detect a situation in which a coating film is scattered resulting from a fractured coating film.SOLUTION: A method of treating a demolished building material with a harmful substance sticking thereto, comprises a paint coating step of coating resin-based paint mixed with a luminous or fluorescent marker on the surface of the demolished building material in a specified space adjusted to a negative pressure. When the coating film coated on the surface of the demolished building material is damaged and scattered to the surroundings, the scattering of the coating film can be detected by recovering dust in the surroundings and irradiating the dust with black light, since the marker mixed in the coating film emits light when the scattered coating film is included in the dust.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a method for treating dismantled building materials, and more particularly to a method for treating dismantled building materials to which harmful substances have been attached. [Background technology]

[0002] Conventionally, as a method for treating this type of demolished building material, a method has been proposed in which a coating film having a laminated structure of two or more layers is formed on the surface of the PCB-contaminated material (see, for example, Patent Document 1). In this treatment method, the first layer that comes into contact with the PCB-contaminated material is formed by a coating method in which a coating member is brought into contact with the surface of the contaminated material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-157244 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned processing method, the coating film may be damaged during removal or transportation, and the coating film may scatter, resulting in contamination of the environment with harmful substances. In this case, it is desirable to detect whether such a situation has occurred, but it is difficult to effectively detect this with the above-mentioned processing method.

[0005] The main object of the method for processing demolished building materials of the present invention is to effectively detect a situation in which the paint film has been damaged and the paint film has been scattered. [Means for solving the problem]

[0006] The method for processing dismantled building materials of the present invention employs the following means in order to achieve the above-mentioned main object.

[0007] The method for processing dismantled building materials of the present invention comprises the steps of: A method for treating demolished building materials to which harmful substances have been attached, comprising the steps of: A paint application process for applying a resin-based paint containing a luminous or fluorescent marker agent to the surface of the dismantled building material in a predetermined space adjusted to a negative pressure; The present invention is characterized by having the following.

[0008] In the method for treating dismantled building materials of the present invention, a resin-based paint containing a luminous or fluorescent marker agent is applied to the surface of a dismantled building material to which harmful substances are attached in a predetermined space adjusted to negative pressure. When dismantled building materials are removed or transported, the coating film applied to the surface of the dismantled building material may be damaged due to collisions or friction between the dismantled building materials and other objects, causing the coating film to scatter around. In this case, when the surrounding dust is collected and a black light is irradiated on the dust, if the dust contains the scattered coating film, the marker agent mixed in the coating film will emit light, so that the scattering of the coating film can be detected. In this way, by applying a resin-based paint containing a luminous or fluorescent marker agent to the surface of the dismantled building material, a situation in which the coating film is damaged and the coating film is scattered can be effectively detected.

[0009] In the method for treating dismantled building materials according to the present invention, the resin-based paint is preferably one in which the marker agent is mixed at 0.007% by weight or more. It is more preferable that the resin-based paint is one in which the marker agent is mixed at 0.01% by weight or more. In this case, the dismantled building materials are steel materials, the harmful substances are polychlorinated biphenyls, the resin-based paint is a water-based vinyl resin paint, and the marker agent is a luminescent agent or a fluorescent agent. As the resin-based paint, a water-based vinyl resin paint (ALARA 1146 CAVITY DECON) developed by Carboline Corporation of the United States for decontamination inside nuclear reactors and Carbocrylic 3346 (a water-soluble acrylic resin paint) by Japan Carboline Corporation are preferable, but phenolic resin paint, alkyd resin paint, melamine resin paint, epoxy resin paint, urethane resin paint, silicon resin paint, polyvinyl chloride resin paint, vinyl acetate resin paint, fluororesin paint, cellulose paint, etc. are also suitable.

[0010] The method for treating dismantled building materials of the present invention may include a blasting process for subjecting the dismantled building materials to a blasting process in a predetermined space adjusted to a negative pressure before the paint application process. By subjecting the dismantled building materials to a blasting process, the concentration of harmful substances on the surface of the dismantled building materials after treatment can be extremely reduced. The method may also include a melting process for melting the dismantled building materials to which the resin-based paint has been applied. When the dismantled building materials are melted, even traces of harmful substances trapped in the resin-based paint are decomposed, allowing the molten steel to be reused. [Brief description of the drawings]

[0011] [Figure 1] 1 is a block diagram showing steps of an example of a method for processing dismantled building materials according to an embodiment of the present invention. FIG. [Diagram 2] FIG. 2 is a process diagram showing the process of an example of a method for processing dismantled building materials according to an embodiment. [Diagram 3] 1 is a test result table showing a list of test results. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Next, an embodiment of the present invention will be described. Fig. 1 is a block diagram showing the steps of an example of a method for processing dismantled building materials as an embodiment of the present invention, and Fig. 2 is a process diagram showing the steps of an example of a method for processing dismantled building materials according to the embodiment.

[0013] The dismantled building materials in the embodiment are building materials to which harmful substances, etc., generated by the dismantling of large-scale facilities such as PCB processing facilities and waste incineration facilities are attached, and correspond to reusable steel materials, discarded concrete waste materials, etc. In the following, the dismantled building materials will be mainly described using reusable steel materials as an example.

[0014] In the embodiment of the method for processing dismantled building materials, first, the dismantled building materials are carried into a first processing chamber adjusted to a negative pressure (step S100). When there is an outer peripheral structure constructed to completely cover the building to be dismantled in order to prevent scattering of dust and harmful substances and groundwater contamination by rainwater, the first processing chamber may be the outer peripheral structure itself, or may be installed inside the outer peripheral structure. When the outer peripheral structure itself is used as the first processing chamber, carrying the dismantled building materials into the first processing chamber is an unnecessary step. As shown in FIG. 1, the first processing chamber is adjusted to a negative pressure by collecting dust with a dust collector.

[0015] Next, the surface of the demolished building material is ground by blasting in the first treatment chamber (step S110). The blasting is a process in which small particles or powder are sprayed and collided with the object to grind the surface of the object. In this embodiment, for example, a circulation blasting method using steel grit as an abrasive is used as the blasting. The blasting is performed in the first treatment chamber adjusted to a negative pressure in order to prevent dust and the like with harmful substances attached thereto from scattering outside the first predetermined space due to the blasting.

[0016] Next, the demolished building materials that have been subjected to the blasting process are transported to a second treatment chamber that is adjusted to a negative pressure (step S120). The second treatment chamber may be installed separately from the first treatment chamber, or may be installed in a section of the first treatment chamber. The second treatment chamber is adjusted to a negative pressure by collecting dust with a dust collector, just like the first treatment chamber.

[0017] In the second processing chamber, first, the surface of the demolished building material that has been subjected to the blasting process is washed (step S130). For washing, water or a well-known washing liquid can be used. By such washing, dust (including harmful substances) that has adhered to the surface of the demolished building material by the blasting process can be washed off.

[0018] In the second treatment chamber, next, a resin-based paint mixed with a marker agent is applied to the surface of the dismantled building material whose surface has been cleaned (step S140). As the resin-based paint, a phenolic resin-based paint, an alkyd resin-based paint, a melamine resin-based paint, an epoxy resin-based paint, a urethane resin-based paint, a silicon resin-based paint, a polyvinyl chloride resin-based paint, a polyvinyl acetate resin-based paint, a fluororesin-based paint, a cellulose-based paint, etc. can be used, and a water-based vinyl resin paint is preferable. For example, a water-based vinyl resin paint (ALARA 1146 CAVITY DECON) developed by Carboline Corporation of the United States for decontamination inside nuclear reactors and Carbocrylic 3346 (a water-soluble acrylic resin paint) by Japan Carboline Corporation can be used. When this water-based vinyl resin paint is applied to a surface contaminated with radioactive materials, the paint penetrates into the minute spaces of the surface to adsorb and bind to the contaminants, trapping them in the coating film. In this embodiment, Carbocrylic 3346 (water-soluble acrylic resin paint: hereinafter referred to as "agent C") manufactured by Japan Carboline Co., Ltd. was used. The marker agent is mixed with the resin paint to detect whether the coating film of the resin paint applied to the surface of the demolished building material is scattered around due to damage or the like when the demolished building material is carried out or transported. For example, a commercially available phosphorescent agent (such as N phosphorescent G-300M (PS-2) manufactured by Nemoto Specialty Chemical Co., Ltd.) or a fluorescent agent (such as 300g fluorescent pink for chalk line manufactured by Shinwa Sokutei Co., Ltd.) having phosphorescence or fluorescence can be used. The marker agent is mixed with the resin paint at 0.007 weight percent or more, preferably 0.01 weight percent or more, and more preferably 0.1 weight percent or more. In this embodiment, the agent C mixed with the marker agent was applied using a paint roller. The cleaning of demolished building materials and the application of resin-based paint are carried out in the second treatment chamber, which is adjusted to negative pressure, in order to prevent dust (including harmful substances) that is slightly attached to the surface of the demolished building materials from scattering outside the second treatment chamber during cleaning or application of resin-based paint.

[0019] The dismantled building materials coated with the resin-based paint are carried out of the second treatment chamber (step S150), and if the dismantled building materials are steel, they are melted by melting treatment and reused as steel, while materials that can only be discarded (such as concrete) are disposed of as industrial waste by landfill treatment or the like. When dismantled building materials are melted, the resin-based paint and the very small amount of harmful substances trapped in this resin-based paint are melted together with the steel, and are rendered harmless by thermal decomposition or the like. When dismantled building materials are discarded, the very small amount of harmful substances are trapped in the resin-based paint, so that environmental pollution can be prevented during transportation and even after disposal.

[0020] Next, we will explain the test that shows that the paint film of the resin-based paint mixed with the marker agent can be effectively detected when the paint film is damaged and the paint film is scattered. For the test, 8 test pieces of paint, each of which was made by mixing 0.007g, 0.009g, 0.01g, 0.1g, 0.5g, 1g, 5g, and 40g of N phosphorescence as a marker agent with 100g of agent C, were applied to metal plates, and the following visual evaluation was performed using black light tests (1) to (5).

[0021] Test (1): Paint is applied to the surface of a metal body, and then a black light is shone on the surface. Test (2): Paint is applied to the surface of a metal body, the surface is polished with sandpaper, and then a black light is shone on the polished surface of the metal plate. Test (3): Paint was applied to the surface of a metal body, and the surface was polished with sandpaper. The polished powder was blended with 1g of dust (iron, plastics, cement, dust) collected from the demolition of a recycling plant, and the blended dust was exposed to a black light. Test (4): Paint is applied to the surface of a metal body, the surface is polished with sandpaper, the polishing powder is sucked up with a dust collector, and then a black light is shone on the outside of the dust collector cover. Test (5): Paint is applied to the surface of a metal body, the surface is polished with sandpaper, the polishing dust is sucked up with a dust collector, and then the dust adhering to the filter inside the dust collector is exposed to a black light.

[0022] The test results are shown in Figure 3. The evaluations of tests (1) to (5) in the table are as follows: Double circle: Clear detection by phosphorescence is possible on the entire surface illuminated by black light. Circle: Clear detection is possible by phosphorescence on a part of the surface illuminated by black light Triangle: It is possible to detect the substance by phosphorescence on a part of the surface illuminated by a black light, but it is difficult to detect due to the influence of dust, etc. X: Undetectable

[0023] As shown in FIG. 3, according to the test (5) as a practical detection method, by mixing 0.007 weight percent or more, preferably 0.01 weight percent or more, and more preferably 0.1 weight percent or more of N phosphorescence as a marker agent into the resin-based paint, it is possible to effectively detect the situation where the paint film is damaged and the paint film is scattered.

[0024] In the above-described embodiment of the method for treating dismantled building materials, a resin-based paint containing a luminous or fluorescent marker agent is applied to building materials (dismantled building materials) to which harmful substances, etc., generated by the dismantling of large-scale facilities such as PCB processing facilities and waste incineration facilities, are attached. When dismantled building materials are carried out or transported, the coating film applied to the surface of the dismantled building materials may be damaged due to collisions or friction between the dismantled building materials and other objects, causing the coating film to scatter around. In this case, by collecting dust in the vicinity and irradiating the dust with a black light, if the dust contains the coating film, the marker agent mixed in the coating film will emit light, so that the coating film can be detected as having been scattered. In this way, by applying a resin-based paint containing a luminous or fluorescent marker agent to the surface of the dismantled building materials, a situation in which the coating film is damaged and the coating film is scattered can be effectively detected. Of course, by applying resin-based paint to demolished building materials, harmful substances can be trapped. As a result, even if the coating of the resin-based paint applied to the demolished building materials is damaged, pollution of the environment by harmful substances can be suppressed.

[0025] In the embodiment of the method for treating dismantled building materials, the dismantled building materials are subjected to a blast treatment before being coated with a resin-based paint containing a marker agent. This allows the concentration of harmful substances on the surface of the treated dismantled building materials to be extremely low. In addition, in the embodiment of the method for treating dismantled building materials, the dismantled building materials after the blast treatment are washed before the resin-based paint is applied to the surface of the dismantled building materials after the blast treatment. This allows the dust (including harmful substances) that adheres to the surface of the dismantled building materials during the blast treatment to be washed off.

[0026] In the embodiment of the method for treating dismantled building materials, the dismantled building materials after the blasting process are washed before applying the resin-based paint to the surface of the dismantled building materials after the blasting process. However, the resin-based paint may be applied to the surface of the dismantled building materials after the blasting process without washing the surface.

[0027] In the embodiment of the method for treating the dismantled building materials, the dismantled building materials are subjected to a blasting treatment before the resin-based paint is applied to the surfaces of the dismantled building materials. However, such a blasting treatment may not be performed.

[0028] The correspondence between the main elements of the embodiment and the main elements of the invention described in the section on means for solving the problem will be described. In the embodiment, the second treatment chamber corresponds to the "predetermined space", and the step S140 of applying a resin-based paint mixed with a marker agent to the demolished building materials corresponds to the "paint application step".

[0029] Note that the correspondence between the main elements of the embodiment and the main elements of the invention described in the Means for Solving the Problem column does not limit the elements of the invention described in the Means for Solving the Problem column, since the embodiment is an example for specifically explaining the form for implementing the invention described in the Means for Solving the Problem column. In other words, the interpretation of the invention described in the Means for Solving the Problem column should be made based on the description in that column, and the embodiment is merely a specific example of the invention described in the Means for Solving the Problem column.

[0030] Although the above describes the form for carrying out the present invention, the present invention is not limited to such an embodiment, and it is of course possible to carry out the present invention in various forms without departing from the spirit of the present invention. [Industrial Applicability]

[0031] The present invention can be used in industries such as the reuse and disposal of dismantled building materials.

Claims

1. A method for treating demolished building materials to which harmful substances have been attached, comprising the steps of: A paint application process for applying a resin-based paint containing a luminous or fluorescent marker agent to the surface of the dismantled building material in a predetermined space adjusted to a negative pressure; A method for processing demolished building materials, comprising:

2. The method for treating dismantled building materials according to claim 1, The resin-based paint contains the marker agent in an amount of 0.007% by weight or more. How to dispose of demolished building materials.

3. The method for treating dismantled building materials according to claim 2, The demolished building material is a steel material, the harmful substance is polychlorinated biphenyl; The resin-based paint is a water-based vinyl resin paint, The marker agent is a phosphorescent agent or a fluorescent agent. How to dispose of demolished building materials.

4. The method for treating dismantled building materials according to claim 3, a blasting process for performing a blasting process on the dismantled building materials in a predetermined space adjusted to a negative pressure before the paint application process; A method for processing demolished building materials comprising the steps of:

5. The method for treating dismantled building materials according to claim 3 or 4, A melting step of melting the dismantled building material to which the resin-based paint is applied; A method for processing demolished building materials.

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