JP2008200550A - Detoxification method of peeled material of asbestos-containing coating layer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To treat an asbestos-containing blown coating layer to be peeled or being peeled already, while preventing the scattering of asbestos, not only to efficiently perform the volume reduction and detoxification of the coating layer but also to easily perform the final disposal and effective utilization of the coating layer. <P>SOLUTION: Before or after the asbestos-containing blown coating layer is peeled, an emulsion of a silicone resin and a powder containing iron oxide or calcium bonded to oxygen is added to obtain a volume reduced molded article under pressure. This molded article is heated by a microwave and asbestos fibers are efficiently detoxified to facilitate final disposal. Further, this is crushed to be mixed with cement and solidified to be effectively utilized as a block or the like. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a processing method for detoxifying a spray coating layer containing asbestos and making it easy to be disposed of or reused.

Asbestos has excellent industrial characteristics such as heat insulation and sound absorption, and has been widely used as a spraying material for heat insulation and sound absorption in construction. Recently, however, the number of lung cancer and mesothelioma patients that are thought to be caused by asbestos has increased and has become a major social problem.
The asbestos-containing sprays used so far are about 70% asbestos for sound absorption and condensation prevention, about 60% asbestos for fireproof coating, and asbestos 30 for other asbestos-containing sprays. % Or less or 5% or less. Asbestos other than asbestos is mainly composed of SiO ₂ and MgO, as in asbestos, but vermiculite, rock wool and the like having a fiber diameter larger than that of asbestos, and its toxicity is small.
Currently, those with an asbestos content of 0.1% or more are prohibited. However, it is desired to completely prevent the asbestos from scattering or to remove the asbestos-containing material and stabilize it for those already constructed. In the latter case, the asbestos pieces are moistened with water and stripped while preventing the asbestos pieces from scattering and packed in bags, etc., but how to transport them and how to dispose them finally Challenges remain. For example, the former Ordinance of the Ministry of Health and Welfare stipulates that double packaging with water-resistant sheets and burying in a controlled disposal site that prevents outflow into the soil or water, but there is little room for a managed disposal site. It's getting harder to do that too. Accordingly, there is a need for a method that can safely and efficiently treat a stripped layer containing asbestos and final disposal site.

Patent Document 1 discloses a method of utilizing microwaves for cement-based slate as a method of heating and detoxifying asbestos fibers. However, this method has a limited object that can be processed, and even if it is applied to a stripped object of the coating layer, sufficient heating with microwaves cannot be performed.
JP 2005-279589 A

The present invention provides a method for facilitating the final disposal or reuse as a resource by efficiently applying the microwave heating method to the treatment of the stripped material of the coating layer containing asbestos, thereby making the asbestos harmless. It is.

The first specific means for solving the above-mentioned problems is the treatment of a coating layer containing asbestos (1). A step of supplying a liquid emulsified with a silicone resin by spraying, etc., infiltrating a coating layer containing asbestos and then peeling it off (2). (3) A step of applying pressure and volume reduction by adding iron or the like to the product obtained in (1). When the product obtained in (2) is performed in the process of microwave heating, the amount of iron oxide added in (1) and (2) is combined, and the iron content is 5 with respect to the weight 100 of the object to be treated. A method of detoxifying the stripped material of the coating layer containing asbestos, characterized by being 5 or more.

The second of the means is the step (1) of 0006,
(1-2) To replace the layer containing asbestos already stripped with a step of adding a liquid emulsified with a silicone resin.

In the third means, the amount of iron oxide added in (1) and (2), or (1-2) and (2) in the step 0006 or 0007 is calculated based on the weight 100 of the object to be treated. The iron content is 1.5 or more, and the weight B as the calcium content of the compound containing calcium combined with oxygen added in (2) satisfies the relationship of 3 × A + B ≧ 12. .

The fourth means is to add the following (4-1) after the step (3) of 0006, 0007 or 0008.
(4-1) Step of coating the molded product after microwave heating with silicone resin

The fifth means is to add the following step (4-2) after the method 0006, 0007 or 0008.
(4-2) A step of crushing the product after microwave heating and mixing and molding and solidifying the cement

By the method described in 0006 and 0008, the process from stripping to final disposal can be safely and efficiently performed on the coating layer containing asbestos. Further, by adding the process described in 0009 or 0010, it can be reused as a resource.

By the method described in 0007 and 0008, the process up to final disposal can be performed safely and efficiently on the coating layer containing asbestos that has already been peeled off. Further, by adding the process described in 0009 or 0010, it can be reused as a resource.

The overall system of the method of the present invention is shown in FIG. The present invention applies a spray coating layer containing asbestos, or a state where it has already been peeled off, to efficiently detoxify asbestos fibers by applying microwave heating and facilitate final disposal. This is a method for making effective use as a resource (for example, enabling landfill to a stable disposal site) or detoxification treatment.

Asbestos fibers are in the form of fine needles, which is a cause of adverse effects on the human body. If this shape changes from a needle shape to a granular shape, it can be rendered harmless even if the whole does not melt. For this purpose, sufficient heating may be performed, but the conditions depend on the components and the temperature. In the method in which heating is performed using gas combustion or another heating element, the object to be heated is heated from the outside, and the object to be treated originally having a heat insulating function is efficiently heated. This is disadvantageous. On the other hand, since microwave heating generates heat to the object to be heated, it may be possible to efficiently heat even those having heat insulation properties. However, the exothermic characteristics vary greatly depending on the substance. In the spray coating layer as the object of the present invention, the main components are silicon oxide and magnesia oxide, and it is difficult to generate heat by microwaves. Even if a substance is added and the portion generates heat, it is difficult to transfer heat to the object to be treated, so that heating that can detoxify asbestos cannot be performed. If the microwave frequency is increased, it is not impossible to promote heating for any substance, but there are other problems with respect to electrical efficiency and the influence of radio waves, which can be used industrially. It is desirable that the requirements for detoxifying asbestos can be satisfied at about 45 GHz. On the other hand, in the present invention, a combination of adding iron oxide or calcium in a form associated with oxidation (CaCO ₃ or CaO) to the object to be treated and increasing the apparent specific gravity of the whole object to be treated. Is adopted.

First, iron oxide has high heat generation due to microwaves, and can react with silicon oxide and magnesium oxide to lower the melting point at high temperatures, promoting the detoxification of asbestos fibers, that is, the granulation of the fiber structure can do. FIG. 2 shows the relationship between the amount of iron oxide added and the harmless achievement rate of asbestos fibers when iron oxide is added to the object to be processed and the molded product has an apparent specific gravity of 1.5 or more. The detoxification achievement rate of asbestos fiber here refers to the proportion of fibers that have a diameter of 1 micron or more observed in the field of view by observing the treated one with a microscope. (The number of fiber structures observed) is expressed as (100-p). Such a change from a fibrous structure to a granular structure is more likely to proceed as the fiber structure having a smaller diameter has a larger surface energy. Therefore, the fact that the fiber structure of 1 micron does not remain means that the material having a diameter smaller than that does not remain, and the human body is not adversely affected. As can be seen from FIG. 2, when the weight of the coating layer is set to 100, asbestos fibers can be rendered harmless when the added amount is 5.5 or more as the iron content in iron oxide.
There are the following two methods for adding iron oxide.
(1) A silicone resin emulsion added as a colorant is used to prevent asbestos fibers from being scattered when the coating layer is peeled off. Examples of the iron oxide include bengara (Fe ₂ O ₃ ) and iron black (Fe ₃ O ₄ ). By adding a colorant, it becomes possible to visually grasp the wet state of the coating layer with the silicone resin emulsion, and there is also an effect that the work of preventing asbestos scattering is performed reliably. In that case, since it is necessary to move the gap between the asbestos fibers constituting the asbestos-containing coating layer, the particle diameter is preferably small, for example, those having a diameter of 0.5 microns or less can be exemplified.
(2) Add after stripping off the coating layer.
In this case, it need not be finely pulverized like a colorant, and may be accompanied by components other than iron oxide.
It is also possible to use (1) and (2) in combination.

In addition, a part of iron oxide is replaced with calcium content combined with oxygen, for example, pulverized powder such as calcium carbonate ore or shells, or lime mixed with silicon oxide, etc. The same effect can be obtained even if the calcium content is expressed as CaO. As shown in FIG. 3, the amount of iron oxide is set to 1.5 or more as the iron content with respect to the weight 100 of the object to be processed, and the iron content A and the calcium content of the compound containing calcium combined with oxygen. When the weight B satisfies 3.0 × A + B ≧ 16.5, detoxification of the asbestos fiber can be achieved. Note that, as with 0015, this result was obtained with an apparent specific gravity of 1.5 or more, as with the molded product.

In order to make asbestos fiber harmless, it is necessary to satisfy the component conditions described in 0015 and 0016 and to reduce the distance between the fibers, that is, the apparent specific gravity of the molded product is a certain value or more. One example is shown in FIG. If the apparent specific gravity is 1.2 or more, that is, if the apparent specific gravity of the peeled material is 0.25, it is necessary to reduce the volume to 1/5 or less by compression.

In order to prevent scattering of asbestos fibers when stripping the coating layer containing asbestos, and to compress a stripped material having a small apparent specific gravity to obtain a molded product having an apparent specific gravity such as 0017, FIG. In A and B, an emulsion of silicone resin is used. In FIG. 1F, the silicone resin used in the present invention in which an emulsion of a silicone resin is used as a coating material for eliminating the roughness of the surface of the molded product after firing is a hydrolysis of organochlorosilanes. It is a polymer having a three-dimensional network structure obtained by polymerization and can be represented as R _n SiO _4-n as a general formula. Usually, it is preferably composed of a combination of units selected from R ₃ SiO _1/2 units, SiO ₂ units, R ₂ SiO units, and RSiO _3/2 units. Here, as R, one type selected from alkyl groups (methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group), cycloalkyl groups such as cyclohexyl group, or phenyl groups. Or 2 or more types of C1-C6 monovalent hydrocarbon groups can be mentioned. Although not limited, a silicone resin in which 80% by mole or more of the whole is a methyl group can be suitably used.
Silicone resins usually include oil type, oil compound type, solution type, emulsion type, and self-emulsifying type. Although not limited, the silicone resin used in the present invention is preferably an emulsion type (O / W type emulsion) and a self-emulsifying type that can be used in combination with water. Particularly preferred is an emulsion type, and among them, a reactive emulsion type silicone resin that cures by a crosslinking reaction and forms a silicone film can be suitably used.
Here, the reactive silicone resin (emulsion type) is obtained by adding a catalyst or an emulsifier to a base polymer and a crosslinked polymer of a silicone resin and emulsifying and dispersing the polymer in water or the like. In the emulsion, the base polymer and the cross-linked polymer are present in the form of microcapsules, respectively, exhibiting good wettability to asbestos-containing materials such as an asbestos-containing coating layer, and rapidly permeate and infiltrate. When the water is evaporated and the microcapsules are broken, a crosslinking reaction occurs, solidification proceeds, and a film is formed on the fiber surface. Commercially available reactive silicone resins (emulsion type) include, but are not limited to, Shin-Etsu Chemical Co., Ltd. Polon MF-20 (trade name), Polon MF-23 (trade name), Polon MF-56 ( Examples include trade name), Polon MK-206 (trade name), Polon MWS (trade name), KM2002T (trade name), and KM2002L-1 (trade name).
Based on the properties of the silicone resin, the asbestos treatment liquid of the present invention containing a silicone resin as a main component quickly penetrates and infiltrates the asbestos-containing coating layer or the asbestos-containing material, and within the coating layer or the asbestos-containing material. Asbestos fibers can be combined with other fibers by exhibiting the properties as an adhesive. When water evaporates and dries (or heats as necessary), as described above, the microcapsule breaks to cause a crosslinking reaction and harden, and asbestos fibers are stably wrapped and held in the silicone resin. be able to. In addition, the silicone resin has an advantage that the stable section is long even when the temperature is raised and the silica finally becomes silica, so that the silicone resin is familiar with the asbestos-containing coating layer.
Silicone resin should be selected in consideration of penetration and infiltration into asbestos-containing coating layers or asbestos-containing materials, film formation on asbestos fibers, and the state of gas generation when heated (including firing or melting). Can do. Here, the penetration and infiltration properties and film-forming properties of the silicone resin are factors that provide the asbestos scattering prevention effect required for asbestos treatment. In addition, the asbestos scattering prevention effect is that asbestos fragments are generated when the asbestos-containing coating layer is peeled and removed by uniformly wetting the surface of the asbestos fibers, wrapping the fibers, and tying them with other fibers. There is an inhibitory effect. In addition, after the silicone resin is solidified, there is an effect of preventing the generation of asbestos fragments due to the flexibility of the silicone resin. These effects are considered in the selection of the silicone resin.
In addition, a modified silicone resin may be used as long as it is a silicone resin that has an effect of preventing asbestos scattering and does not generate a gas that causes a problem during heating. Examples of the modified silicone resin include alkyd-modified silicone resin, polyester-modified silicone resin, acrylic-modified silicone resin, epoxy-modified silicone resin, and phenol-modified silicone resin.
Preferred silicone resins from the viewpoint of the asbestos scattering prevention effect include tosseal, silicone type, modified silicone type, polysulfide type and polyurethane type. However, a chlorobrene-based or vinyl chloride-based silicone resin is not preferable because it may generate a problem gas during heating.
For the treatment of the asbestos-containing coating layer or the asbestos-containing material, the above-mentioned silicone resin, preferably an emulsion-type silicone resin, more preferably a reactive emulsion-type silicone resin, is used as an asbestos-treatment liquid, and water and it is necessary. Accordingly, chemical components are added to emulsify the silicone resin, and the concentration and viscosity of the treatment liquid are adjusted. If the viscosity of the treatment liquid is too low, it tends to penetrate and infiltrate when supplied to an asbestos-containing coating layer or an asbestos-containing material, but the yield tends to drop and tends to sag. Conversely, if the viscosity is too high, the asbestos-containing coating layer Or there exists a problem of being hard to osmose | permeate and infiltrate when it supplies to an asbestos containing material.
The blending ratio of the silicone resin content and the emulsifier such as water in the treatment liquid is determined based on the asbestos-containing coating layer and the asbestos-containing material curing acceleration effect and curing strength, asbestos-containing coating layer and the asbestos-containing material penetration and It can set suitably from both sides of an infiltration effect. Specifically, for example, when the water blending ratio is increased, the asbestos-containing coating layer rapidly penetrates and infiltrates, while when the water blending ratio increases, the solidification time of the asbestos-containing coating layer is delayed and the solidification strength is increased. Tend to decrease.
The viscosity of the treatment liquid is in the range of 2 to 10 mPa · s, preferably 2 to 8 mPa · s, more preferably 3 to 6 mPa · s, and still more preferably 3.5 to 5 mPa · s. : Temperature 25 ° C., B-type viscometer (manufactured by Tokyo Keiki Co., Ltd., measured at 30 rpm for 1 minute)], it is preferable to set and adjust appropriately.

In FIG. 1A, an emulsion of silicone resin is sprayed onto the surface of the coating layer containing asbestos to be removed. The proportion of the silicone resin content in the emulsified liquid is between 10 and 50% by weight, and the remainder is an emulsifier such as water. The amount of the silicone resin emulsion to be used depends on the thickness of the coating layer, but when the coating layer is 30 mm, ^{2 to} 7 liters per 1 m ^{2 of} the asbestos spray layer is appropriate. As a result, the fibers of the layer containing asbestos can be wetted, and scattering during peeling can be prevented. The addition of a colorant composed of iron oxide and the effect thereof are as described in 0015. Since the wetting of the emulsion of the silicone resin proceeds in about 10 minutes after the spraying, the stripping operation is performed thereafter using human power or a machine.
In FIG. 1D, powdered iron oxide, calcium carbonate, or so that the content of calcium combined with iron oxide and oxygen satisfies the conditions described in 0015 and 0016, A fired product containing calcium oxide is added. This operation can be performed in the hopper 1 shown in FIG.

When the coating layer containing asbestos has already been peeled off by a method that does not use a silicone resin, and the asbestos fibers are in a bag so that they do not scatter, emulsification of the silicone resin as shown in E of FIG. The liquid and the calcium content combined with iron oxide and oxygen are added so as to satisfy the conditions described in 0015 and 0016. The addition of the emulsion of the silicone resin is preferably performed in a bag containing the object to be processed from the viewpoint of preventing scattering of asbestos fibers during handling. On the other hand, addition and mixing of calcium components combined with iron oxide and oxygen can be performed in a bag or in a hopper shown in FIG.

1 is subjected to pressurization and volume reduction using the apparatus shown in FIG. 5 in FIG. 1B. The processing object 2 stored in the hopper 1 is sent to the compression device 4 through the supply device 3 and compressed and molded. The supply device 3 has a rotary blade 5 and can adjust the cutout amount by the rotation thereof. The compression device 4 includes a mold 6 and a compression tool 7. The size of the molded product obtained by this is, for example, 100 mm × 100 mm × (25 to 55) mm. The processing object 2 is put into a mold 6 made of metal, and is compression-molded by a compression tool 7 such as a press. In the case of the above molded product, when a force of 2 t is applied, the apparent specific gravity required for the present invention can be 1.2 or more. If possible, it is desirable to apply a force of about 5 t so that the apparent specific gravity is 1.5 or more. When the compressed and molded product is naturally dried or forcedly dried by blowing hot air or the like, solidification of the silicone resin proceeds. As a result, it is possible to prevent asbestos from being scattered during handling and transportation.
In the compression molding, the squeezed liquid is stored in the reservoir 9. This is re-used in the system, for example, back to E in FIG. Alternatively, the silicone resin can be cured by drying, and can be buried in the final disposal site as solid matter without scattering of asbestos fibers.

In C of FIG. 1, the molded product is heated by microwaves, and the asbestos fibers are changed into a granular structure and rendered harmless. FIG. 6 shows a microwave heating apparatus. The compression molded product 8 is pushed into the microwave heating space 10 using the pusher 11, the microwave blocking door 12 is closed, and the microwave is applied by the microwave oscillator 13 and the microwave agitator 14 to heat the charged material. The microwave heating wave should just be 2.45 GHz or more. heating. The temperature of the processed material is detected by the optical pyrometer 15, and when the value reaches 1100 ° C., preferably 1200 ° C., heating is performed for 30 minutes or more. If this condition is satisfied, the microwave oscillation is stopped, the microwave blocking door 11 is opened, and the fired product 16 is taken out.

There are the following methods for disposing or using the fired product obtained by microwave heating.
(1) The fired product is transported and disposed of in landfills. Whether the management type must be used as the final disposal site or whether the stable type can be used legally depends on the interpretation of the law at that time, but technically the fiber structure of 1 micron or less disappears. Therefore, the stable type can be used.
(2) When the surface of the baked product is rough, a silicone resin film can be formed on the surface. Even if this treatment is performed, there is no effective use destination, and when landfilling in the final disposal site, there is an effect that it is possible to prevent the generation of powder by rubbing the surface during handling such as transportation, making it a stable disposal site. Increased possibility of being landfilled. On the other hand, as a molded product, it can be used as a foundation material for civil engineering that does not require dimensional accuracy. When the silicone resin is selected from those described in 0017, it is stable without being deteriorated by ultraviolet rays as is the case with ordinary resins, and peeling can be prevented by forming this film.
(3) When dimensional accuracy is required, such as in various blocks, a method of re-crushing the microwave heat-treated product, adding cement, kneading, and curing to a predetermined shape is used. It is done. In this case, if necessary, other ceramic components (such as ceramics) can be kneaded and hardened by adding crushed waste. The amount of cement added may be 5 to 20% by weight.

The present invention includes the following aspects.
(1) Asbestos scattering prevention, characterized in that, with respect to the apparent volume 100 of the layer containing asbestos, a volume of 20 or more is supplied by spraying a liquid emulsified with a silicone resin, and the layer containing asbestos is infiltrated with the silicone resin. Method.
(2) Asbestos is injected by injecting a liquid obtained by emulsifying silicone resin using a tubular device having a reduced tip diameter at one or more locations per 400 cm ² of horizontal cross section of the layer containing asbestos into the layer containing asbestos. A method for preventing asbestos scattering, which comprises infiltrating a layer containing silicon with a silicone resin.
(3) A method for preventing asbestos scattering, comprising: infiltrating a layer containing asbestos with a silicone resin by the method of (1) or (2);
(4) A method for preventing asbestos scattering, comprising heating and stabilizing a layer containing asbestos peeled off by the method of (3) to 1450 ° C. or higher.
(5) A method for preventing asbestos scattering, comprising infiltrating a layer containing asbestos with a silicone resin by the method of (1) or (2) and then heating to 80 ° C. or higher.
(6) In (5), asbestos is characterized in that hot air is blown into the inside of the layer containing asbestos through a tube having holes at the tip and side surfaces and having a diameter reduced toward the tip. Splash prevention method.
(7) In the method of (1) or (2), a liquid obtained by mixing 1 to 30% by weight of cement with a liquid obtained by emulsifying a silicone resin is used (4) or (5) The asbestos scattering prevention method described.
(8) For the apparent volume 100 of the layer containing asbestos after injecting the silicone resin liquid into the layer containing asbestos using a tubular instrument having a reduced tip diameter. A method for preventing asbestos scattering, comprising supplying a liquid emulsified with a silicone resin in a volume of 20 or more by spraying or the like, and infiltrating a layer containing asbestos with the silicone resin.
(9) When a liquid is supplied to a layer containing asbestos by spraying or the like and infiltrated to prevent asbestos scattering, a colorant is mixed in the liquid so that the state of infiltration can be visually observed. Detoxification treatment method for those containing asbestos.
(10) A detoxification method for asbestos-containing material, wherein the liquid is an emulsion of a silicone resin in (9).
(11) A liquid used for carrying out the method of (9), wherein the weight required for the emulsification is 50 to 500 and a colorant is further added to the silicone resin weight 100. A detoxification product for asbestos-containing materials.
(12) The method for detoxifying a thing containing asbestos according to (9) or (10), wherein the colorant is carbon, a metal compound, or an organic compound.
(13) The asbestos-containing product for detoxifying treatment according to (7), wherein the colorant is carbon, a metal compound, or an organic compound.
(14) When stripping a layer containing asbestos, a liquid obtained by emulsifying a silicone resin with a colorant added is supplied by spraying, etc., and the state of infiltration is visually observed to ensure infiltration. A method for detoxifying a thing containing asbestos, characterized in that, after grasping the conditions, the subsequent infiltration work is performed on the condition that the liquid to which the colorant is added is used.
(15) When stripping a layer containing asbestos, a liquid obtained by emulsifying a silicone resin with a colorant added is supplied by spraying, etc., and the state of infiltration is visually observed to ensure infiltration. A method for detoxifying a thing containing asbestos, characterized in that after the conditions are grasped, the subsequent infiltration work is performed under the same conditions without using a colorant.
(16) Supply a liquid containing emulsified silicone resin to the layer containing asbestos by spraying, infiltrate the layer containing asbestos, and press the peeled material using a press or the like at a temperature of 60 ° C. or lower. Next, a method for reducing the volume and detoxifying those containing asbestos, which comprises curing by heating to a temperature of 80 ° C. or higher and 350 ° C. or lower.
(17) A layer containing asbestos that has been stripped is wetted with a liquid emulsified with a silicone resin, and then pressed using a press or the like at a temperature of 60 ° C. or lower, and then at a temperature of 80 ° C. or higher and 350 ° C. or lower. A method of reducing and detoxifying those containing asbestos, which is characterized by being heated and cured.
(18) Supplying the liquid containing emulsified silicone resin to the layer containing asbestos by spraying, etc., infiltrating the layer containing asbestos, and then pressing the peeled material using a press or the like at a temperature of 60 ° C. or less, Next, a method for reducing the volume and detoxifying a material containing asbestos, characterized by heating to 400 ° C. to 1200 ° C. and firing.
(19) A liquid emulsified with a silicone resin is added to and wetted after the layer containing asbestos has been peeled off, and then pressurized at a temperature of 60 ° C. or lower, and then heated to a temperature of 400 ° C. or higher and 1200 ° C. or lower. A method for reducing the volume and detoxifying a material containing asbestos, characterized by firing.
(20) Supplying the liquid containing emulsified silicone resin to the layer containing asbestos by spraying, etc., infiltrating the layer containing asbestos, and then pressing the peeled off using a press or the like at a temperature of 60 ° C. or less, Next, volume reduction of those containing asbestos, characterized by melting by heating to 1250 ° C. or higher. Detoxification method.
(21) It is characterized by adding a liquid emulsified with a silicone resin to a stripped layer containing asbestos, moistening it, pressurizing it at a temperature of 60 ° C. or lower, and then heating it to 1250 ° C. or higher to melt it. To reduce the volume and detoxify those containing asbestos.
(22) In (16) to (21), what is separated as a liquid at the time of pressurization using a press or the like is used to wet a layer containing asbestos or a layer that has been peeled off. Volume reduction / detoxification method for asbestos-containing materials (23) Supply, infiltrate, and infiltrate a liquid containing an emulsified silicone resin into the layer containing asbestos or its fragments, A method of detoxifying a thing containing asbestos, characterized by forming a liquid or solid film.
(24) The asbestos characterized in that the liquid supplied to the layer containing asbestos or its fragments in (23) is a mixture of an emulsion of silicone resin and a liquid obtained by adding a viscosity modifier to water. Detoxification treatment method of things including.
(25) The liquid supplied to the layer containing asbestos or a fragment thereof in (23) is a mixture of an emulsion of a silicone resin and a liquid obtained by adding a viscosity modifier and a colorant to water. Detoxification treatment method for those containing asbestos.
(26) A layer containing asbestos, which is a liquid used for carrying out (24) or (25) and contains water and a viscosity modifier, or water, a viscosity modifier and a colorant. Supplies for detoxification.
(27) In (23) to (26), in order to equalize the penetration of the liquid containing the emulsified silicone resin into the layer containing asbestos, the liquid is supplied by spraying twice or three times or more. A method for detoxifying a thing containing asbestos characterized by being divided into two.
(28) In (23) to (25), in order to equalize the penetration of the liquid containing the emulsified silicone resin into the layer containing asbestos, the liquid is divided into two having different viscosities. A method for detoxifying a thing containing asbestos, characterized by supplying a material having a high viscosity and then supplying a material having a lower viscosity.
(29) In (23) to (24), after hardening of the silicone resin, a layer containing asbestos is peeled off, and the detoxification treatment method for asbestos-containing material.
(30) In (23) to (25), before the curing of the silicone resin occurs, the layer containing asbestos is peeled off, then it is mechanically compressed, and then the silicone resin is cured. A detoxifying method for containing asbestos, characterized in that
(31) Supplying, penetrating, and moistening a liquid obtained by mixing the emulsion of the silicone resin and the liquid of (26) into asbestos debris that has been peeled off without using the silicone resin, and curing the silicone resin A method of detoxifying a thing containing asbestos, characterized in that the silicone resin is cured after being mechanically compressed before the occurrence of the above.
(32) For carrying out (30) or (31), a stripped piece is stored, a supply unit for cutting out a required amount therefrom, the piece is compression molded and molded An apparatus used for detoxifying a thing containing asbestos, characterized by comprising a compression / molding / removal part for taking out an object and a liquid recovery part for collecting a liquid that has oozed out by compression.
(33) Used for carrying out (30) or (31), storing the peeled debris, a supply part for cutting out the required amount therefrom, compression molding the debris A compression / molding / removal part for taking out the waste and a liquid recovery part for collecting the liquid that has oozed out by the compression, and the compression / molding / removal part is heated to 60 ° C. or higher and 300 ° C. or lower. A device used for detoxifying things containing asbestos.
(34) The material separated as a liquid when compressed mechanically in (30) or (31) is supplied / penetrated into a layer containing asbestos or a stripped piece in (23) or (31).・ A method for detoxifying a thing containing asbestos, characterized by being reused for wetting

Regarding the rock wool spray layer (coating layer containing asbestos) having a thickness of 30 mm containing 30% by weight of asbestos that had been sprayed on the steel frame of the parking lot, first, the volume (100% by volume) was applied to the coating layer containing asbestos. ) Was sprayed with an emulsion of polyurethane silicone resin (trade name: Polo MF-56, manufactured by Shin-Etsu Chemical Co., Ltd.) in an amount corresponding to 50% by volume. The ratio of the silicone resin in the silicone resin emulsion was 25% by weight. Further, 3.5% by weight of Bengala was mixed in the emulsion as a colorant, which was used for visual judgment of the wet state by spraying. After this spraying, the peeling operation was performed manually 60 to 185 minutes later. When the content of asbestos fibers in the air collected from the vicinity of the worker during the peeling operation was measured, the number of asbestos fibers of 5 microns or more contained in 1 liter of air was 2 or less.
When the weight of the coating layer containing asbestos in the hopper 1 shown in FIG. 5 is 100, the iron ore pulverized fine powder is 6.0% in terms of iron content. In addition, it was compressed to obtain a molded product of 100 mm × 100 mm × (25-50) mm. Its apparent specific gravity was 1.7. After this molded product is naturally dried, it is placed in a microwave heating chamber as shown in FIG. 6, a 2.45 GHz microwave is applied, and the surface is measured with an optical thermometer to reach 1200 ° C. After holding for 35 minutes, it was taken out. After cooling, it was reclaimed in a managed final disposal site. A sample of the fired product was observed with a microscope and it was confirmed that a fibrous structure having a diameter of 1 micron or less was not observed.

For the 35 mm thick vermiculite spray layer (coating layer containing asbestos) containing 40% by weight of asbestos sprayed on the walls and ceiling of the boiler room, first, the volume (100% by volume) of 35% by volume An equivalent amount of polyurethane-based silicone resin (trade name Polo MF-56, manufactured by Shin-Etsu Chemical Co., Ltd.) was sprayed. The ratio of the silicone resin in the silicone resin emulsion was 15% by weight. Further, 2.5% by weight of Bengala was mixed as a colorant in the emulsion, and was used for visual judgment of the wet state by spraying. After this spraying, the peeling work was performed manually 120 to 220 minutes later. When the content of asbestos fibers in the air collected from the vicinity of the worker during the peeling operation was measured, the number of asbestos fibers of 5 microns or more contained per liter of air was 1 or less.
When the weight of the coating layer containing asbestos is 100 in the hopper shown in FIG. 5, the fine powder obtained by pulverizing iron ore is added as an iron component and compressed to the peeled material (apparent specific gravity 0.31). As a result, a molded product of 100 mm × 100 mm × (25-50) mm was obtained (apparent specific gravity was 1.8). This was put into a microwave heating chamber as shown in FIG. 6, microwaves of 2.45 GHz were applied, the surface was measured with an optical thermometer, held for 40 minutes after reaching 1200 ° C., and then taken out. . After cooling this, it is applied to an emulsion of polyurethane-based silicone resin (trade name: Polo MF-56, manufactured by Shin-Etsu Chemical Co., Ltd.) (the ratio of silicone resin in the silicone resin emulsion is 46% by weight) to a depth of 2 m. The film was pulled up and then naturally dried to form a film. This molded product has water repellency. This was experimentally used for the reclamation of civil engineering foundations, and those that were buried in civil engineering foundations were checked every six months and confirmed that there was no change even after three years. The rest was used for landfill of the final disposal site.

The rock wool spray layer (cover layer containing asbestos) having a thickness of 45 mm containing 20% by weight of asbestos sprayed on the walls and ceiling of the boiler room corresponds to 45% by volume of the volume (100% by volume). An amount of polyurethane-based silicone resin (trade name Polo MF-56, manufactured by Shin-Etsu Chemical Co., Ltd.) was sprayed. The ratio of the silicone resin in this silicone resin emulsion was 20% by weight. Further, 3.2% by weight of Bengala was mixed in the emulsion as a colorant, and this was used for visual judgment of the wet condition by spraying. After this spraying, the peeling work was performed manually 120 to 220 minutes later. When the content of asbestos fibers in the air collected from the vicinity of the worker during the peeling operation was measured, the number of asbestos fibers of 5 microns or more contained per liter of air was 1 or less.
When the weight of the coating layer containing asbestos in the hopper shown in FIG. 5 is 100, the fine powder obtained by pulverizing iron ore is 2.5, carbonic acid as iron content. A finely pulverized calcium ore was added at a rate of 11.5 and compressed to obtain a molded product of 100 mm × 100 mm × (25-50) mm (apparent specific gravity 1.6-1.7). This was put into a microwave heating chamber as shown in FIG. 6, microwaves of 2.45 GHz were applied, the surface was measured with an optical thermometer, and after 1150 ° C. was held for 50 minutes, it was taken out. . After cooling, this was pulverized, and Portland cement was added at a ratio of 8 to the weight of 100 to make a 120 mm × 230 mm × 45 mm block, which was used for partitioning the flower bed.

Silicone resin at a ratio of 35 to 100 in weight in the cover layer containing asbestos that has been peeled off and temporarily stored in a plastic bag (mainly rock wool containing 45% by weight of asbestos) Of emulsion was added. The emulsion of the silicone resin contains 25% by weight of a polyurethane-based silicone resin (trade name: Polo MF-56, manufactured by Shin-Etsu Chemical Co., Ltd.). When the weight of the coating layer containing asbestos in the hopper 1 shown in FIG. 5 is 100, fine powder obtained by pulverizing iron ore is added at a rate of 7.5 as iron content and compressed, and 100 mm × 100 mm × ( A molded product of 25-50) mm was obtained. Its apparent specific gravity was 1.5 to 1.6.
This was put into a microwave heating chamber as shown in FIG. 6, microwaves of 2.45 GHz were applied, the surface was measured with an optical thermometer, held at 35 ° C. for 35 minutes, and then taken out. . After cooling, it was reclaimed in a managed final disposal site. A sample was collected and observed with a microscope, and it was confirmed that a fibrous structure having a diameter of 1 micron or less was not observed.

A coating layer containing asbestos that has already been peeled off and temporarily stored in a plastic bag (mainly vermiculite containing 30% by weight of asbestos), and a ratio of 25 to 100 in the bag. The silicone resin emulsion was added. The emulsion of the silicone resin contains 21% by weight of polyurethane-based silicone resin (trade name Polo MF-56, manufactured by Shin-Etsu Chemical Co., Ltd.). When the weight of the coating layer containing asbestos in the hopper shown in FIG. 5 is 100, the fine powder obtained by pulverizing iron ore is 2.1, the fine pulverized product of the shell is 14 calcium, .1 was added and compressed to obtain a molded product of 100 cm × 100 cm × (25-50) mm (apparent specific gravity was 1.8). This was put into a microwave heating chamber as shown in FIG. 6, microwaves of 2.45 GHz were applied, the surface was measured with an optical thermometer, held at 35 ° C. for 35 minutes, and then taken out. . A sample was collected from the fired product and observed under a microscope to confirm that a fibrous structure having a diameter of 1 micron or less was not observed. The fired product was pulverized, and Portland cement was added at a ratio of 11 to its weight of 100 to make a block, which was used as a paving stone for a garden passage.

The method of the present invention is a volume reduction and detoxification method that can be applied to a layer containing asbestos to be peeled off, and also to a layer containing asbestos that has already been peeled off.

Shows the system of the present invention The influence which the addition amount (weight as iron content) of iron oxide has on the harmless achievement rate of asbestos fiber is shown. The effects of the amount of iron oxide added (weight as iron) and the amount of calcium combined with oxygen (weight as calcium) on the harmless achievement of asbestos fibers are shown. The influence of the apparent specific gravity of the molded product on the harmless achievement rate of asbestos fiber is shown. An example of a pressurizing and volume reducing device for a stripped coating layer is shown. An example of the apparatus which microwaves the reduced-size molding is shown.

Explanation of symbols

1. Hopper 2. 2. Object to be processed 3. Supply device 4. Compression device Rotating blades6. Formwork 7. Compression tool8. 8. Compression molding 10. Squeezed liquid reservoir Microwave heating chamber 11. Movable microwave barrier 12. Pusher 13. Microwave oscillator 14. Microwave agitator 15. Optical pyrometer 16. Baked product 17. Thermal insulation, microwave barrier

Claims (5)

Next processing of the coating layer containing asbestos;
(1). A step of supplying a liquid emulsified with a silicone resin by spraying, etc., infiltrating a coating layer containing asbestos and then peeling it off (2). (3) A step of applying pressure and volume reduction by adding iron or the like to the product obtained in (1). When the product obtained in (2) is performed in the step of microwave heating, the amount of iron oxide added in (1) and (2) is combined, and the iron content is 5.5 with respect to 100 weight of the object to be treated. The method of detoxifying the stripped material of the coating layer containing asbestos characterized by the above. The method (1) of claim 1 is replaced with the step (1-2) below.
(1-2) The process of adding the liquid which emulsified the silicone resin to the layer containing asbestos already stripped. In the process of claim 1 or claim 2, the amount of iron oxide added in (1) and (2) or (1-2) and (2) is 1 as iron content with respect to 100 weight of the object to be treated. And the weight B as the calcium content of the compound containing calcium combined with the oxygen added in (2) satisfies the relationship of 3.0 × A + B ≧ 16.5. A method for detoxifying a stripped covering layer containing a characteristic sbestos. A method for detoxifying a stripped material of a coating layer containing asbestos, wherein the following step (4-1) is added after claim 1, 2 or 3.
(4-1) Step of coating the molded product after microwave heating with silicone resin The method of detoxifying a stripped material of a coating layer containing asbestos, wherein the following (4-2) is added after claim 1, 2 or 3.
(4-2) A step of crushing the product after microwave heating and mixing and molding and solidifying the cement

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