JP5513714B2 - Detoxification liquid for substances containing asbestos or rock wool - Google Patents

Description

  The present invention relates to a treatment liquid for chemically detoxifying various building materials and structures manufactured using asbestos (asbestos) and rock wool.

  Efforts are being made worldwide to avoid the risk of illness caused by asbestos and rock wool-containing materials produced in the past. Rock wool is said to be less dangerous than asbestos, but the idea has recently been revised. In the present specification, these dangerous substances are collectively referred to as “asbestos-containing materials”.

  Technology development for detoxifying these asbestos-containing materials has been extensively carried out, but the detoxification techniques are mainly high heat application methods and chemical methods. The high heat application method is a treatment in which a material containing asbestos or the like is heated to thermally change its shape, and the chemical method is a treatment in which a chemical is applied to chemically change asbestos or rock wool into another substance. In either case, the fiber form regarded as harmful can be changed into a harmless form, or can be changed to another substance. These methods are usually applied to materials containing asbestos that have been removed from use. It is also known to prevent the scattering of asbestos by covering the surface with a coating material or masking material as it is in use, but this method is mainly used to prevent scattering. It does not change the asbestos inside to a harmless form. Therefore, this method eventually requires a detoxification process when the building material has passed its endurance year and is disposed of. However, the method can also be included in the chemical detoxification treatment as long as the coating agent or the like can be immersed therein to completely modify the asbestos to a detoxification state.

  Since the high heat application method requires a high temperature treatment, a typical method is typically a heat treatment of a material containing asbestos removed from the use site in a furnace. However, this method is not economical in that it requires a furnace for that purpose and requires a great deal of cost for safety management during furnace operation. In particular, the dust collection treatment of the high-temperature exhaust gas generated during furnace operation must be complete, and the gas ejected from the inlet to the atmosphere at the time of material input is likely to be accompanied by fine asbestos, so avoid it Countermeasures are also necessary. And even if such countermeasures are completely taken, the treatment in the furnace is a waste material with a large capacity containing a large amount of cement-based cement and aggregate components, so that the transportation and storage of the waste material, Asbestos dust is likely to be scattered in the atmosphere during work processes such as sorting, and it is extremely difficult to completely suppress the secondary contamination.

  On the other hand, the chemical treatment method is advantageous in that it can avoid the above-mentioned problems in the furnace operation of the high heat application method. There are various chemical detoxification treatments for materials containing asbestos and the like that have been proposed so far. Examples of using a "fluorine-based compound" as a treating agent include those described in Patent Documents 1 to 4. .

  Patent Document 1 discloses an invention in which an aqueous solution containing an organic acid and a fluoride ion source acts on a material containing asbestos. Examples of the fluoride ion source include ammonium fluoride, alkali metal fluoride, and hydrofluoric acid, and examples of the organic acid include acetic acid, trifluoroacetic acid, lactic acid, and formic acid. However, the liquid of Patent Document 1 cannot reduce chrysotile crystals unless it is reacted for a long time. For example, as shown in the Examples, in order to detoxify the asbestos-containing material, normal temperature treatment usually requires 2 to 3 days, and actually requires a treatment period of several cycles. Heating can reduce the processing time, but it still requires several hours. Further, as in Patent Document 1, when an acid is added to a solution of hydrofluoric acid salt such as an ammonium salt or an alkali metal salt of hydrofluoric acid, the salt reacts with the acid and is a fluorinated substance that is a dangerous substance. Risk of generating hydrogen fluoride gas. Therefore, it is not practical as a method for quickly and safely realizing the detoxification treatment of asbestos-containing materials generated in large quantities, and there are no reports of successful implementation in fact.

  Patent Document 2 describes an invention in which an aqueous solution in which hexafluorosilicate and an inorganic acid are dissolved is allowed to act on a material containing asbestos. Examples of the hexafluorosilicate include alkali metal, alkaline earth metal or ammonia hexafluorosilicate. However, even with this treatment liquid, there is a risk of hydrogen fluoride generation, but it may be safer than that of Patent Document 1. However, since the treatment time is long and at least several tens of hours of immersion are required, and hexafluorosilicate is a toxic substance as used in fungicides and insecticides, there is a risk in the treatment operation. Therefore, it cannot be denied that there is a problem in workability and safety of the processing operation.

  Patent Document 3 describes a detoxification treatment method in which asbestos is added to water and mechanical energy such as friction is applied in the presence of metal, metal oxide or metal fluoride to cause mechano-reaction. . Examples of the metal fluoride include calcium fluoride powder and sodium fluoride powder. In this method, mechanical energy such as oxidation, reduction, decomposition and synthesis in water is performed by applying mechanical energy. Therefore, it is necessary to finely pulverize the asbestos-containing material in which a cement-based solidified material or the like is present, and a large amount of mechanical energy is required because the reaction is governed by mechanical energy. In addition, since the reaction rate depends on the mechanical energy, the processing time is inevitably long, and there is a problem that it is difficult to manage the end point of whether or not it can be completely rendered harmless.

Patent Document 4 discloses an aqueous solution of phosphoric acid or acidic phosphoric acid, an aqueous inorganic polymer compound, specifically, a polymer compound having a Si—O, Ti—O or Al—O bond in the molecule, and in some cases. Further, an asbestos treating agent comprising a water-soluble fluorine compound is described. Examples of aqueous inorganic polymer compounds include water glass, alkyl silicate partial hydrolyzate aqueous solution, colloidal silica, alkyl titanate partial hydrolyzed aqueous solution, titania sol, alumina sol, etc., and water-soluble fluorine compounds include hydrofluoric acid and silicofluorination. Illustrative are hydroacid, titanium hydrofluoric acid, or their salts of ammonium, sodium, potassium, strontium, rubidium. When these water-soluble hydrogen fluoride compounds are used, since the hydrogen fluoride component is involved in the reaction, as explained by dissolving the SiO ₂ or SiO ₂ · Fe ₂ O ₃ component by the hydrogen fluoride component, If so, there will still be a safety problem, and, as seen in the example, it takes several days of processing at room temperature (7 days in Example 2). Therefore, similarly to Patent Documents 1 and 2, there are difficulties in terms of safety and workability.

Japanese Patent Publication No. Hei 4-506165 (International Publication WO90 / 1562) Japanese translation of PCT publication No. 2000-514397 (International publication WO98 / 13314) JP 2007-301423 A Japanese Patent Laid-Open No. 2-51453

  The present invention has been made to solve the problems of the prior art as described above, and has been made for the purpose of developing a technique capable of detoxifying asbestos and other containing materials with good workability by a chemical treatment method. Is.

According to the present invention, a detoxification treatment liquid containing asbestos or rock wool containing water, aluminum fluoride, and an inorganic acid, the aluminum fluoride does not exceed 5% by mass in terms of AlF ₃ Harmless to materials containing asbestos, etc., which are dissolved in the liquid in an amount and the concentration of inorganic acid is 6 mol / L or less, preferably 0.3 to 6 mol / L, more preferably 0.5 to 6 mol / L A chemical treatment solution is provided. The inorganic acid used is preferably one or two of sulfuric acid and phosphoric acid.

  The treatment liquid according to the present invention can be modified into a harmless product by reacting with asbestos or rock wool. In addition, the reaction rate with asbestos and rock wool is much faster than conventional processing solutions, and toxic hydrogen fluoride is not substantially generated even during or after the reaction. Therefore, the detoxification treatment of the asbestos-containing material can be performed safely and reliably with good workability.

  In order to achieve the above object, the present inventor has conducted research and development of detoxification technology for materials containing asbestos, etc. for many years from the time when asbestos pollution began to be screamed, both for high temperature application methods and chemical methods. However, this time, we have found that an acidic solution in which an appropriate amount of aluminum fluoride, among many chemical substances, is dissolved exhibits a specific reaction with asbestos and rock wool. Moreover, this reaction has a characteristic not seen in other chemical methods in that it can proceed to a harmless reaction product at a high reaction rate without generation of hydrogen fluoride. For this reason, the detoxification process of a large amount of materials such as asbestos can be easily and securely performed.

  It is desirable in practical operation that the detoxification treatment of the asbestos-containing material using the fluorine compound does not involve generation of toxic hydrogen fluoride. However, when asbestos-containing materials are detoxified with a fluorine ion-containing solution, if the detoxification efficiency is increased to such an extent that actual operation is possible, the reaction conditions can completely suppress the generation of hydrogen fluoride. It is very difficult to set. Even in the case of Patent Document 1 and Patent Document 2 described above, it is substantially impossible to detoxify asbestos under the condition that hydrogen fluoride is not generated. However, when an inorganic acid aqueous solution in which an appropriate amount of aluminum fluoride is dissolved is allowed to act on asbestos, the reaction that produces a harmless product proceeds rapidly, and hydrogen fluoride is not generated. It became clear that the reaction could proceed, and the present invention could be completed. The present invention is described in detail below.

  The asbestos-containing materials to be treated by the present invention are various building materials and structures manufactured using asbestos (asbestos) and rock wool, and the asbestos-containing materials that are targeted for the prevention of contamination related to asbestos. Substantially all of the above. According to the experiments of the present inventor, the liquid composition of the present invention is not only for white asbestos (chrysotile) but also for asbestos and rock wool such as tea asbestos (amosite) and blue asbestos (crocidolite). This is because it has been found that it can be safely modified into a harmless substance. Therefore, the liquid composition of the present invention can treat any asbestos or rock wool-containing material produced in the past.

  For example, asbestos-containing products include “building materials” such as asbestos slate and various boards with cement as a binder, various asbestos-containing cement boards in which gypsum and slag coexist, asbestos-containing rock wool materials ( Sound absorption board, etc.) and tile products and floor materials that use resin as a binder: “seal and heat insulating materials” containing asbestos, such as asbestos textiles, gland packing, joint sheets, gaskets or insulation, asbestos-containing fireproof coated boards Asbestos-containing calcium silicate board, roof folding back and back asbestos insulation, chimney asbestos insulation, etc .: “friction material” containing asbestos, for example, brake parts for vehicles and industrial mold products, etc .: “heat insulating material” containing asbestos, for example asbestos Insulating materials such as heat insulating materials, diatomaceous earth, pearlite, calcium silicate, etc. coexisting with asbestos can be mentioned. Only asbestos "," asbestos sprayed rock wool "or" wet asbestos-containing spraying material "such as spraying construction walls with the ceiling, the beams also include interior and exterior materials of the pillars and the like.

  These asbestos-containing materials are rarely present in a simple state of asbestos or rock wool, and in most cases are dispersed and fixed in the material with a binder such as cement or resin. The liquid composition of the present invention can react with asbestos or rock wool dispersed and fixed with various binders to modify them into harmless products. In addition, the liquid composition of the present invention can allow the asbestos-containing material to act in its use state (the operation will be described later as “current position treatment”), It is also possible to remove or collect from the position, collect the waste materials such as asbestos, and allow the liquid composition of the present invention to act on these waste materials (described later as “scrap material treatment”).

The liquid composition of the present invention comprises water, aluminum fluoride and an inorganic acid, and these three components are essential. Aluminum fluoride in the liquid is dissolved in an amount not exceeding 5% by mass in terms of AlF ₃ , and the inorganic acid is 6 mol / L or less, preferably 0.3 to 6 mol / L, more preferably 0.5 to 0.5%. It should be contained at 6 mol / L.

As a raw material of aluminum fluoride used for producing this liquid composition, aluminum fluoride (AlF ₃ ) or aluminum fluoride hydrate may be used. It is said that 0.55 g of aluminum fluoride (AlF ₃ ) is dissolved in 100 g of water at room temperature. The main use of aluminum fluoride so far is an additive in the electrolytic smelting of aluminum, which has been used to lower the melting point of the alumina in the bath and to increase the conductivity. This aluminum fluoride can also be used as a raw material for producing the liquid composition of the present invention. As the aluminum fluoride hydrate, those having a value of x of 0.5, 1.0, 1.5, 3.0, 3.5, 9.0 of the general formula AlF ₃ .xH ₂ O are known. ing. Even these hydrates can be used as long as they can produce the liquid composition of the present invention in which the dissolved concentration of aluminum fluoride is 5% by mass or less in terms of AlF ₃ . For those with x values of 3.0 and 3.5, the crystal structures of α type and β type are known. However, when x = 3.0, the α type is used, and x = 3.5. The β type is more convenient to use because it is more soluble in water. If the concentration of aluminum fluoride dissolved in the liquid composition of the present invention exceeds 5% by mass, hydrogen fluoride may be generated when it reacts with asbestos or rock wool. The dissolved concentration of aluminum is 5% by mass or less in terms of AlF ₃ .

  As the inorganic acid for producing the liquid composition of the present invention, sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, succinic acid and the like can be used, and among these, use of sulfuric acid or phosphoric acid is preferable. It may be advantageous to use a mixed acid of sulfuric acid and phosphoric acid. In any case, the acid concentration in the liquid composition is preferably 6 mol / L or less. If the acid concentration exceeds 6 mol / L, the reaction with asbestos or rock wool does not proceed, or even if it proceeds, the reaction rate becomes slow, which is not practical. Although the reaction proceeds even when the acid concentration in the liquid composition is relatively low, the reaction rate with asbestos or rock wool is actually slow at less than 0.3 mol / L, and a long processing time is required. Not right. The preferred acid concentration is 0.3 to 6 mol / L, and more preferably 0.5 to 6 mol / L.

  When the acidic aqueous solution in which 5% by mass or less of aluminum fluoride dissolved in this way is contacted with asbestos or rock wool, an unexpectedly fast reaction rate as compared with a conventional chemical treatment method for materials containing asbestos or the like. The reaction proceeds and the fibrous asbestos or rock wool is transformed into another substance. Actually, fine particles are generated as a solid, and a suspension in which these particles are suspended is obtained. According to the inventor's experience, when a batch of reaction is performed with asbestos or rock wool using a fixed amount of the liquid composition, the pH of the liquid rises from the acidic range toward the neutral zone as the reaction proceeds. As long as the pH of the liquid is on the acidic side, the reaction with asbestos or rock wool proceeds, and when it reaches a neutral range, the reaction becomes very slow and eventually the reaction hardly occurs. Surprisingly, however, the aluminum fluoride in the liquid does not chemically change into another substance even when the reaction proceeds, except in special circumstances. For this reason, although not yet theoretically clarified, the aluminum fluoride dissolved in the liquid may act as a catalyst that promotes the chemical reaction between the inorganic acid and asbestos or rock wool. The inventor thinks. This means that the chemical reaction between an inorganic acid and asbestos or rock wool hardly proceeds at room temperature, but if an appropriate amount of aluminum fluoride is dissolved in the inorganic acid solution, the chemical reaction with asbestos or rock wool The reaction is accelerated rapidly even at room temperature, and the aluminum fluoride is not exhausted until the pH is close to 7. This is supported by the progress of the reaction, and the generation of hydrogen fluoride does not occur. Can also be supported.

  The case where the material containing asbestos and the like is “currently processed” and the case of “waste material processing” will be described with the liquid composition of the present invention.

In-situ treatment is to detoxify the asbestos-containing material currently used in the building or structure. In this case, the liquid composition of the present invention is applied to the asbestos-containing material or Just spray. In this operation, if the acid concentration is too high, there may be a problem in terms of safety of workers. Therefore, it is preferable to use a weak acid such as phosphoric acid. When the example of the liquid composition for application | coating is given, when the acid to be used is a sulfuric acid, phosphoric acid, or the mixed acid of a sulfuric acid + phosphoric acid, it is as follows.
B) Sulfuric acid concentration: 0.5-1.5 mol / L
B) Phosphoric acid concentration: 0.5-2.5 mol / L
C) Concentration of mixed acid: 0.5 to 2.0 mol / L
In any case, a liquid composition in which 0.1 to 5% by mass of aluminum fluoride is dissolved is applied, and this is applied with a brush or the like from the surface of the asbestos-containing material in use.

When processing the current position by spray,
D) Phosphoric acid concentration: 0.5-2.5 mol / L
And a liquid composition in which 0.1 to 5% by mass of aluminum fluoride is dissolved, and this is sprayed onto the surface of the containing material such as asbestos using a spray gun.

  When the liquid composition of the present invention is impregnated into a material containing asbestos or the like at the current position by application or spraying, the liquid penetrates into the material and the reaction with the asbestos or rock wool contained in a dispersion immediately starts. As long as is present and as long as the pH of the liquid remains in the acidic range, the reaction with the asbestos or rock wool remaining in the material proceeds. According to the experience of the present invention, a phenomenon is observed in which the reaction product of white or brownish color covers the surface of the material near the end point of the reaction. That is, the reaction product has a self-curing ability. The treated material usually has an uneven surface because of the reduced volume of asbestos or rock wool inside, and the reaction product formed on the uneven surface usually also has unevenness. .

  In this way, the material that has been processed at the current position normally has the cured reaction product not fixed and scattered, and the reaction product itself is harmless. Asbestos and rock wool no longer scatter in the air.

  The most complete treatment at the site is to make all asbestos or rock wool in the asbestos-containing material into a harmless reaction product at the site, but this is possible with the liquid composition of the present invention. It is. In the liquid composition of the present invention, aluminum fluoride is not substantially consumed even when the reaction proceeds and the acid concentration is lowered. Aluminum fluoride probably functions as a catalyst that promotes the reaction between acid and asbestos, and the reaction with asbestos or rock wool existing inside proceeds. Thus, as long as the acid is present, the remaining asbestos or rock wool can be converted into a harmless reaction product. Therefore, a liquid composition in an amount commensurate with the completion of the reaction with the amount of asbestos or rock wool present in the material may be applied to the material. If the excessively used liquid remains on the surface of the material or in the vicinity thereof, it can be neutralized using a neutralizing material, or it may be washed with water.

  The material thus processed at the current position can be used as a non-polluting material as it is, but if the surface is uneven or unsightly as described above, various plaster materials are used on the surface. Or paint can be applied. As a result of various experimental studies, the present inventor found that the kneaded material prepared by mixing slaked lime with gypsum, both in terms of adhesion strength and durability, with respect to the material surface that has been treated with the composition of the present invention. It has been found that it can be a very suitable surface treatment agent.

Therefore, according to the present invention, an asbestos or rock wool-containing substance made of water, aluminum fluoride and an inorganic acid is made harmless, and the aluminum fluoride is contained in the liquid in an amount not exceeding 5% by mass in terms of AlF _3. The asbestos or rock wool-containing material is treated with the detoxifying solution having an inorganic acid concentration of 0.5 to 1.5 mol / L, and gypsum and Provided is an in-situ detoxification treatment method for asbestos-containing materials comprising applying a plaster made of a slaked lime kneaded material.

  Next, a treatment (waste material treatment) in which the liquid composition of the present invention is applied to a material containing asbestos or the like that has been used or removed from its current position and collected as waste of the asbestos-containing material Will be described. Up to now, with regard to such asbestos-containing waste materials, apart from the application of the high heat application method, there has not been established a method that can be safely and reliably rendered harmless by the chemical treatment method. In a state where it is contained, the waste material is disposed of in a landfill at a waste disposal site. According to the present invention, the liquid composition of the present invention can be safely and reliably rendered harmless simply by applying the asbestos-containing material waste material, and the treated material can be reused as a resource material. Is also possible.

  The waste material treatment with the liquid composition of the present invention is preferably a method in which the waste material is charged into a container such as a tank or a tank and brought into contact with the liquid composition of the present invention. In this case, there are typically a method of processing at a site where waste materials are generated and a method of processing waste materials collected from various places. In the former case, a mobile or assembly type processing device can be disposed at the waste generation site, and in the latter case, it can be processed in an installed plant. Contact between the liquid composition and the waste material in the container may be either continuous or batch. The contact is preferably performed under stirring. Unlike in-situ processing such as spraying and coating, waste material processing is mainly performed in a container, so use a liquid composition that contains a relatively high concentration of acid. can do. In consideration of the actual cost, it is preferable to use sulfuric acid as the acid.

Examples of the liquid composition in the case of waste material treatment are as follows.
E) Sulfuric acid concentration: 1.5-3 mol / L
F) Mixed acid concentration: sulfuric acid 1-2 mol / L + phosphoric acid 0.5-1 mol / L
G) Sulfuric acid concentration: 3-6 mol / L
In any case, a liquid composition in which 0.1 to 5% by mass of aluminum fluoride is dissolved is used, and these liquid compositions are placed in a container while taking into account the type and amount of waste materials and the situation at the processing site. React with waste materials.

  Although the mechanism of the reaction between the liquid composition of the present invention and asbestos or rock wool has not yet been fully elucidated, the chemical change when the liquid composition of the present invention is applied to white asbestos (chrysotile) is a typical example. The following are the results of various test results.

Test 1
5 g of asbestos mineral (white asbestos: chrysotile) was added and stirred in 200 mL of an AlF ₃ acidic aqueous solution having a phosphoric acid concentration of 1.5 mol / L and an AlF ₃ concentration of approximately 0.5% by mass. The asbestos mineral changed its form after a few seconds and became a white precipitate. When this precipitate was separated by filtration and allowed to stand, it became a powder. This powder and the asbestos mineral before the treatment were subjected to SEM observation and XRD (X-ray diffraction) measurement. These measurement results are shown in FIGS.

  FIG. 1 shows an SEM image (× 200 magnification) of the asbestos mineral before treatment, and FIG. 2 shows an SEM image (× 2000 magnification) of the powder after treatment. While fibrous white asbestos is dispersed in FIG. 1, the powder of FIG. 2 is an aggregate of fine particles, and each fine particle is often a plate-like crystal.

  FIG. 3 is a diffraction peak obtained by X-ray diffraction measurement of the asbestos mineral before the treatment, and FIG. 4 is a diffraction peak of the powder after the treatment. The peaks in FIG. 4 are all different from those in FIG. 3, and it can be seen that the asbestos mineral before treatment does not exist in the powder after treatment.

Note that the symbols A, B, and C attached to each peak in FIG. 3 correspond to peaks that appear in the following compounds, respectively.
A: CaCO ₃ (Calcite)
B: Ca ₅₄ MgAl ₂ Si ₁₆ O ₉₀ (Alit)
C: Mg ₃ Si ₂ O ₅ (OH) ₄ (Chrysotile)
Moreover, the symbol D attached to the peak in FIG. 4 corresponds to a peak appearing in the following compound.
D: Ca (H ₂ PO ₄ ) ₂ .H ₂ O (calcium dihydrogen phosphate monohydrate)

From these results, it is clear that the mineral in the asbestos before the treatment is chemically changed to a completely different substance. The reaction product was a crystal of calcium dihydrogen phosphate monohydrate in this test. Neither Al component nor fluorine component of AlF ₃ used in the reaction is present in the crystals in the product.

  Hereinafter, representative examples of the liquid composition of the present invention will be given to show the effects thereof.

Example 1
5 g of anhydrous aluminum fluoride (AlF ₃ ) was dissolved in 1 L (liter) of an aqueous phosphoric acid solution having a phosphoric acid concentration of 1.0 mol / L. The AlF ₃ concentration of the liquid is 0.5% by mass. 10 mL of the obtained liquid was sprayed at room temperature to 5 g of a mixture of 50% by mass of white asbestos (chrysotile) and 50% by mass of rock wool in a beaker. The reaction was completed within a few seconds after spraying. When left as it was, curing started after about 3 hours. Furthermore, when the aggregated substance obtained by leaving it to stand at room temperature for 2 days was analyzed by dispersive dyeing phase contrast microscopy according to JIS A1481, no dyed fiber consistent with asbestos was found, and the remaining chrysotile and rock wool were less than 0.1 wt%. It was confirmed that.

  The above example was repeated except that the type or concentration of acid was changed as follows. Table 1 shows the liquid composition of each example (Nos. 2 to 5) and the processing results thereof, with the above example being No. 1.

Comparative Example 1
The example of “No. 1” in Example 1 was repeated except that the type or concentration of the acid was changed as follows. Their liquid compositions and treatment results are shown in Table 2.

Example 2
5 g of anhydrous aluminum fluoride (AlF ₃ ) was dissolved in 1 L (liter) of an aqueous sulfuric acid solution having a sulfuric acid concentration of 3.0 mol / L. The AlF ₃ concentration of the liquid is 0.5% by mass. 200 mL of the obtained liquid was put into a beaker, and 5 g of a mixture of 50% by weight of white asbestos (chrysotile) and 50% by weight of rock wool was put into the beaker and stirred at room temperature. The reaction was completed within a few seconds after stirring. After standing for 1 hour, the solid content in the treatment solution was filtered off, and the substance obtained by allowing the solid content to stand at room temperature for 2 days was analyzed by dispersive staining phase contrast microscopy in accordance with JIS A1481, and was consistent with asbestos. No dyed fiber was found, and the remaining chrysotile and rock wool were confirmed to be less than 0.1 wt%. This example is referred to as “No. 8”.

  The example of “No. 8” was repeated except that the type or concentration of the acid was changed as shown in Table 3. Their liquid compositions and treatment results are also shown in Table 3.

Comparative Example 2
The example of “No. 8” in Example 2 was repeated except that the type or concentration of the acid was changed as follows. The liquid composition and treatment results are shown in Table 4.

It is a scanning electron microscope (SEM) image of asbestos mineral before processing with the liquid composition of the present invention. It is a scanning electron microscope (SEM) image of the product after processing with the liquid composition of the present invention. It is a chart of the X-ray diffraction peak obtained by carrying out X-ray diffraction measurement of the asbestos mineral before processing with the liquid composition of the present invention. It is a chart of the X-ray diffraction peak obtained by carrying out X-ray diffraction measurement of the product after processing with the liquid composition of the present invention.

Claims (2)

A detoxification treatment liquid containing asbestos or rock wool containing water, aluminum fluoride, and inorganic acid, and aluminum fluoride dissolves in the liquid in an amount not exceeding 5% by mass in terms of AlF ₃ The detoxifying solution having an inorganic acid concentration of 0.3 mol / L or more and 6 mol / L or less. The inorganic acid is one or two kinds of sulfuric acid or phosphoric acid. The asbestos- or rock-wool-containing substance detoxifying treatment liquid according to claim 1.