WO2008001464A1

WO2008001464A1 - Method of asbestos degradation and asbestos degradation apparatus

Info

Publication number: WO2008001464A1
Application number: PCT/JP2006/313116
Authority: WO
Inventors: Hisao Kakegawa; Yoshihiro Suenaga; Yasuhiro Tanaka; Shuzo Kakinuma; Hitoshi Takanashi
Original assignee: Onc Co., Ltd.; E.S.T Japan Co., Ltd.; National University Corporation Kagawa University
Priority date: 2006-06-30
Filing date: 2006-06-30
Publication date: 2008-01-03
Also published as: TW200800328A

Abstract

Untreated asbestos substance and water are placed in reaction vessel (2). Subsequently, hydrofluoric acid is injected, and agitated while pulverizing the asbestos substance to thereby attain degradation of the asbestos by hydrofluoric acid. After the execution of degradation processing, the resultant reaction mixture is loaded with a fluoride ion adsorbent and a metal ion adsorbent. Thereafter, a neutralizing agent is added, and under agitation, neutralization is effected. Further, a coagulant is added, thereby obtaining aggregates. As the asbestos is converted by hydrogen fluoride into hexafluorosilicic acid (salt) and magnesium fluoride, the asbestos is completely eliminated and becomes nonasbestos inorganic substances, thereby attaining detoxification to human health. As the ion adsorption, neutralization and coagulation steps of the reaction mixture resulting from the chemical degradation of asbestos can be performed in hermetically sealed reaction vessel (2), safety can be ensured. As batch operation can be made by the use of the reaction vessel (2), large-volume processing can be realized.

Description

Specification

Asbestos decomposition treatment method and decomposition treatment apparatus

Technical field

The present invention relates to an asbestos decomposition processing method and a decomposition processing apparatus. More specifically, the present invention relates to a practical treatment technology that makes asbestos harmless safely and reliably.

Background art

[0002] Asbestos has been used in many building materials and industrial products because of its excellent heat resistance, acid resistance, and wear resistance. Since this asbestos is very fine and has a jagged surface with a jagged surface, it is known to cause carcinogenesis that is difficult to be excreted when inhaled into the lungs. However, since this asbestos is a naturally occurring mineral crystal, its chemical stability is extremely high, strong and difficult to change, so there is currently a technology that can safely and safely detoxify asbestos in large quantities. Not.

[0003] Patent Document 1 describes a technique for reusing an acetylene gas cylinder containing asbestos.

In this technology, the asbestos-containing material in an acetylene gas cylinder is decomposed with a fluorine-containing organic acid as a decomposition agent, and the decomposed residue is removed from the gas cylinder so that the gas cylinder can be reused. .

For decomposition, hydrofluoric acid is introduced into the gas cylinder, and the remaining suspension is decomposed from the gas cylinder with a pump. The decomposed residue is neutralized with lime milk.

However, since Patent Document 1 is a technology that focuses on the treatment of gas cylinders, it is possible to treat each cylinder one by one, but a large amount of asbestos that has been removed from building materials and industrial products etc. It cannot be processed efficiently.

[0004] Therefore, asbestos waste treatment methods at present are either final disposal sites for industrial waste, either packing or solidification disposal or melting disposal. It is supposed to be transported (Non-Patent Document 1). However, this does not completely eliminate the harm of asbestos. At the present stage, methods for melting and solidifying asbestos are being studied, but the melting point of asbestos is very high at 1540 ° C, and there is a problem that enormous energy is required for complete melting.

Patent Document 1: JP-A-6-15251

Non-Patent Document 1: "Disposal of Asbestos-Containing Products" Hitachi High-Technologies, Quality Assurance Department, issued September 12, 2005

Disclosure of the invention

Problems to be solved by the invention

[0006] The present invention provides a decomposition processing method and a decomposition processing apparatus that do not require any energy for detoxifying asbestos, can completely eliminate asbestos with high safety, and can perform mass processing. Objective.

Means for solving the problem

[0007] The method for decomposing asbestos according to the first aspect of the present invention is to put untreated asbestos substance and water into a reaction tank, then inject hydrofluoric acid, and stir while stirring the asbestos substance to hydrofluoric acid. It is characterized by decomposing asbestos.

The asbestos decomposition treatment apparatus according to the second aspect of the present invention includes a reaction vessel capable of containing water and untreated asbestos material and sealed, a tank for injecting hydrofluoric acid into the reaction vessel, and an asbestos material in the reaction vessel. A stirring powdering machine that stirs and pulverizes the gas and a gas venting gas that discharges the gas generated in the reaction tank.

The asbestos decomposition treatment method according to the third aspect of the invention is that the residue after performing the decomposition treatment method of claim 1 is heated and separated into hydrogen fluoride and water to evaporate, and the evaporated gas is passed through water. Thus, hydrofluoric acid is obtained, and the hydrofluoric acid is recovered.

The asbestos decomposition treatment method according to the fourth aspect of the present invention includes a heating device for heating the reaction tank, and a gas evaporated from the heated reaction tank. And a trap tank that allows the water to pass through underwater.

The asbestos decomposition treatment method according to the fifth aspect of the invention is the addition of a fluoride ion adsorbent and a metal ion adsorbent to the remaining reaction mixture after the decomposition treatment method of claim 1 is performed, and then the neutralizer is added to the reaction mixture. Neutralize with stirring, and add a flocculant to obtain agglomerates. It is a sign.

An asbestos decomposition treatment apparatus according to a sixth aspect of the invention includes a reaction vessel that can be filled with a reaction mixture remaining after the decomposition treatment method of claim 1 is sealed, and a fluoride ion adsorbent and a metal ion adsorbent in the reaction vessel. And a stirrer for stirring the reaction mixture in the reaction tank.

The invention's effect

[0008] According to the first invention, asbestos is converted into hexafluoroacid (salt) and magnesium fluoride by hydrogen fluoride. Detoxified.

According to the second invention, asbestos can be decomposed by hydrogen fluoride in a sealed reaction tank, it is safe, and batch processing can be performed by using the reaction tank, so that mass processing is possible.

According to the third invention, hydrofluoric acid remaining after asbestos decomposition can be recovered by a simple process of evaporation and trapping. For this reason, reuse is also possible.

According to the fourth invention, hydrofluoric acid remaining after asbestos decomposition can be recovered by a simple process of evaporation and trapping. For this reason, reuse is also possible.

According to the fifth invention, fluorine ions and metal ions are adsorbed by the adsorbent from the reaction mixture obtained by chemically decomposing asbestos, neutralized by the neutralizer, and aggregated by the flocculant, so that they are stabilized in a harmless state. Insolubilized. This prevents contamination after chemical decomposition.

According to the sixth aspect of the invention, it is safe because each step of ion adsorption, neutralization, and aggregation of the reaction mixture obtained by chemically decomposing asbestos in a sealed reaction vessel can be performed safely, and batch processing can be performed by using the reaction vessel. Processing is possible.

BEST MODE FOR CARRYING OUT THE INVENTION

Next, embodiments of the present invention will be described with reference to the drawings.

《Asbestos decomposition method 'equipment》

As shown in Fig. 1, the method for decomposing asbestos in the present invention includes (1) chemical decomposition of asbestos with hydrogen fluoride (decomposition step I) and (2) recovery of hydrofluoric acid (recovery step II). )When (3) Includes three steps of stable insolubilization of fluorine ions and metal ions (insolubilization step III). The invention of claim 1 includes only the decomposition step, the invention of claim 3 is an invention including two steps in which the recovery step II is combined with the decomposition step I, and the invention of claim 5 is the above It is an invention comprising two steps in which the insolubilization step ΠΙ is combined with the decomposition step I. The invention of claim 2 is an apparatus for performing the decomposition step I, the invention of claim 4 is an apparatus for performing the recovery step II, and the invention of claim 6 is an apparatus for performing the insolubilization step III It is.

[0010] << Decomposition process I >>

First, the asbestos decomposition process will be described in detail with reference to FIGS. The following numbers (1) to (5) correspond to the symbols (1) to (5) in FIGS.

(1) Enclosed in a storage bag

“Asbestos substances”, that is, asbestos fibers collected from buildings, various building materials, pipe seal materials, wear materials, etc., asbestos contaminants such as paper, rubber, adhesives, glue, and asbestos removal work. Plastic sheets are enclosed in double polyethylene storage bags 1 when asbestos is removed.

[0011] From the following steps, a reaction vessel 2 made of plastic or corrosion-resistant metal is used. The reaction layer 2 is composed of a double container, and a gap between the outer container 3 and the inner container 4 is filled with a heat insulating material. The reaction tank 2 is made of plastic or corrosion-resistant metal in order to avoid corrosion caused by hydrofluoric acid used for decomposition. Insulation is used to absorb the heat during the reaction and ensure safety.

[0012] (2) Immersion in water

Place storage bag 1 containing the asbestos fibers and asbestos contaminants in reaction tank 2 and add water W to the extent that storage bag 1 is immersed. This water W is added for the purpose of preventing the scattering of the aspect during the subsequent treatment and suppressing the extreme reaction.

[0013] (3) Release into water

The storage bag 1 containing asbestos material such as asbestos fiber and asbestos contaminants 1 is cut underwater with any tool such as scissors to release the asbestos material into the water.

(4) Agitation and grinding Next, after the reaction vessel 2 is sealed with a plastic or corrosion-resistant metal lid 5, the asbestos substance is chopped and powdered with a stirring pulverizer 6.

[0014] (5) Chemical decomposition

With reaction tank 2 sealed, hydrofluoric acid (48% HF) is added from tank 7 to reaction tank 2, stirred with agitator-pulverizer 6, and then left for several hours to chemically decompose asbestos. In the above process, asbestos is completely decomposed by the following reaction formula.

3MgO -2SiO · 2Η アス (asbestos) + 18HF (hydrogen fluoride) → 2H SiF (hexafluorosilicate) + 3MgF (magnesium fluoride) + 9H 0

The volume ratio of water and hydrofluoric acid is about 1 ::! ~ 4: 1 (HF concentration: 12-24%), but it may be adjusted to a more appropriate concentration depending on the situation.

[0015] In the chemical decomposition step (5), asbestos is completely decomposed by the above reaction formula, and is converted into hexafluorosilicate (salt) and magnesium fluoride.

At this time, the internal air expands due to heat generated during the chemical reaction, but the expanded air is discharged from the degassing pipe 9 in which the activated charcoal tank 8 is installed. When a large amount of acid gas is discharged, an exhaust gas neutralization tank containing an appropriate concentration of sodium hydroxide solution may be installed.

[6] (6) Confirmation of disassembly

The decomposition state of asbestos can be confirmed with an electron microscope, EDX spectrum, X-ray crystal diffraction, etc. If asbestos is present inside the solid material, create slice slices, then perform a thorough analysis at the nano level using the above analysis method to confirm the degradation inside the solid material. In addition, the presence or absence of asbestos scattering may be determined by sampling the air with a dust collector during processing and then observing with an electron microscope.

[0017] Through the above chemical treatment, single crystal asbestos is polycrystallized. In addition, the crystal structure changes, and the appearance is not a needle-shaped fine fiber. In other words, it changes to an inorganic substance that is not the best. For this reason, even if it is mixed in the human body, it does not stay in the body and is easily discharged outside the body, so that it is completely harmless to the human body.

[0018] << Recovery Process II >>

After the asbestos is decomposed by the decomposition step I, hydrofluoric acid remains. This foot The hydrofluoric acid is dissolved in water, or it remains in the residue after decomposition with water. This hydrofluoric acid can be recovered. This recovery method includes the following two methods. a) After neutralizing with an alkali such as calcium hydroxide or sodium hydroxide, recover as calcium fluoride, sodium fluoride, etc.

b) After evaporation, trap in water to recover hydrofluoric acid itself.

FIG. 4 shows an apparatus for b), 51 is a heating device, 52 is a trap tank, 53 is an alkaline solution tank, and 54 is an activated carbon tank. The heating device 51 is a device that heats the reaction tank 2 shown in FIGS. 2 to 3 and heats it. Electric heating, gas, or any other means is used as the heating means. By heating, hydrofluoric acid separates into hydrogen fluoride and water and evaporates. The evaporated gas is guided to the trap tank 52 through a pipe. Water W is put in the trap tank 52, and the introduced hydrogen fluoride becomes hydrofluoric acid in the water, so that it can be recovered as hydrofluoric acid itself.

[0019] The number of the trap tanks 52 may be one, but two or more may be connected in series to recover hydrofluoric acid more effectively.

Further, an alkaline solution tank 53 may be connected after the trap tank 52 in the final stage. In this case, if hydrogen fluoride gas flows excessively, it is neutralized and rendered harmless, which increases safety. Here, the generated compound is sodium fluoride when calcium hydroxide is used, and sodium fluoride when sodium hydroxide is used.

If the activated carbon tank 54 is installed before exhaust gas is exhausted, the safety of exhaust gas can be ensured.

[0020] << Insolubilization Step III >>

In the decomposition step I in the present invention, since hydrofluoric acid is used as described above, a high concentration of hydrofluoric acid remains after the chemical decomposition reaction of asbestos. This hydrofluoric acid may be insolubilized together with the residue that could not be recovered by the recovery step described above, or the residue that was not recovered step II. Also, asbestos-contaminated waste contains toxic metal ions such as lead, cadmium, and copper. In this case, in particular, fluorine ions and It is necessary to insolubilize toxic metal ions. Hereinafter, the insolubilization step III will be described in detail with reference to FIGS.

The following numbers (1) to (4) correspond to the symbols (1) to (4) in FIG. 5 and FIG.

[0021] (1) Addition of adsorbent 'Neutralization

As shown in FIG. 5, 5-10% of fluorine ion and metal ion adsorbents (volume% with respect to the total reaction mixture) are added from the tank 11 to the reaction mixture containing the acid in the reaction tank 2. As the fluoride ion adsorbent, polyaluminum aluminum, aluminum sulfate, aluminum, aluminum oxide (alumina), iron powder, iron sand and the like can be used alone or in combination. As the metal ion adsorbent, hydroxyapatite, bone charcoal, activated carbon, ion exchange resin and the like can be used. Next, add neutralizing agents such as calcium hydroxide (slaked lime) and sodium hydroxide, and neutralize to pH 7 while stirring.

As the neutralization reaction proceeds, insoluble calcium fluoride is produced by the reaction between hydrogen fluoride and calcium hydroxide. At this time, the viscosity rises, but it is adjusted by adding water according to the situation.

(2) Aggregation

An appropriate amount of an aggregating agent is further added to the reaction mixture, and the solids are aggregated to form flocs (aggregates).

(3) Next, as shown in Fig. 6, it is separated into agglomerates F and waste water w by dehydration. For dehydration, a dehydrator may be used, but it can be easily performed with a hemp bag or the like in consideration of cost reduction.

[0022] (4) Purification of waste water and separation of aggregates

Finally, the waste water w is discharged through a purification container 10 filled with a purification agent. As the purifier, natural hydroxyapatite particles, activated carbon, ion exchange resin, and the like can be used. When natural hydroxyapatite is used, heavy metal ions and the like can be removed, which is suitable for finally purifying waste water.

The agglomerates produced in step (3) include a) building materials, rubber, paper, plastics, etc. b) fluorination power, inorganic, magnesium fluoride, hexafluoro-acid (salt), key acid (salt), etc. Compounds are included, but these are separated and processed in groups a) and b). [0023] After separation, a) group of plastics, rubber, building materials, etc. are finally disposed of as partially recycled power or waste. In addition, harmless inorganic compounds in group b) can be used as a fluorine source to replace hotel stone (main component: calcium fluoride).

[0024] << Other Embodiments >>

In the above embodiment, hydrofluoric acid (5 to 48% hydrogen fluoride) can be used by mixing an acid such as sulfuric acid, hydrochloric acid, nitric acid, or trifluoroacetic acid with hydrofluoric acid. Some can also use these acids for pretreatment.

For example, in the case of asbestos waste containing basic substances such as concrete, the basic substances in concrete may act on hydrofluoric acid to reduce the asbestos decomposition effect. If the basic substance is neutralized with sulfuric acid, hydrochloric acid, etc. as a pre-treatment before treatment, hydrofluoric acid treatment has the advantage that the asbestos decomposition effect is not diminished.

[0025] In addition to hydrofluoric acid, glass processing plant wastewater containing high concentration hydrofluoric acid can be used for asbestosic treatment. In this case, the wastewater treatment capacity of expensive glass processing plant can be implemented simultaneously with asbestos treatment, so it is possible to reduce the total treatment cost.

Example

Next, examples of the present invention will be described.

Example 1 is an example of the decomposition step I, and Example 2 is an example of the insolubilization step III.

[0027] (Example 1)

After placing in a plastic reaction tank and adding 75 ml of water to 10 g of asbestos and immersing it in water, the dispersion was lost, and then 25 ml of hydrofluoric acid (48% hydrogen fluoride) was prepared. After 15 minutes and 24 hours, the precipitate was collected with a filter paper, washed with water and dried, and then the crystalline state of treated and untreated asbestos was compared and observed using an electron microscope.

Fig. 7 (A) shows untreated asbestos dispersed in water, and Fig. 7 (B) shows asbestos after chemical decomposition for 15 minutes. As can be seen by comparing (A) and (B), asbestos dissolves after 15 minutes, and asbestos-specific fibrous crystals completely disappear, It can be confirmed that the fine powdered stone powder is dispersed in water. After the reaction, the weight of the collected solid sediment was measured to be about 8.8 g and 2.4 g after 15 minutes and 24 hours, respectively, as shown in Fig. (B) and (C). After the reaction, it was confirmed that the solid content was further dissolved.

FIG. 8 shows an electron micrograph and a limited-field diffraction pattern obtained from a range of 250 nm. (A) In the untreated asbestos shown in the figure, tough fibers peculiar to asbestos were observed, and the fibers had a diameter of about 50 nm and a length of about 10 μπι. Several single crystal fibers gathered to form a fiber structure unique to asbestos. Although the asbestos fiber bends strongly and supplely, it was observed from the analysis of the limited field diffraction pattern that the two-fold symmetry axis of the fiber axis and the diffraction pattern coincided well, and it was observed that it was a single crystal.

[0029] On the other hand, as shown in Fig. (Iii), after 15 minutes of chemical treatment, the strong and supple long fiber structure unique to asbestos disappeared completely and became fragile due to weakening. It was in a state. Furthermore, the force with which a fragment with a diameter of about lOOnm can be observed upward is 500 ηm or less. The limited field diffraction pattern was completely different from the untreated asbestos, resulting in a concentric ring pattern. As a result of analyzing the limited-field diffraction pattern, a rutile-structured MgF phase was confirmed, and no asbestos single crystal was found at all.

[0030] Then, as shown in Fig. (C), after 24 hours of chemical treatment, the crystals were much more vigorous. As after 15 minutes of chemical treatment, no asbestos-specific fibrous morphology was observed. In addition, the diffraction pattern force of the sample after 24 hours of chemical treatment is exactly the same as that of the sample after 15 minutes of chemical treatment, so it was confirmed that there was no further change in crystal structure. Therefore, it was confirmed that the chemical change of asbestos (the above reaction formula (1)) was almost completely completed after 15 minutes.

FIG. 9 shows an EDX (Energy Dispersive X-ray Spectroscopy) spectrum of the solid precipitate after chemical treatment for 24 hours. As shown in the figure, strong peaks of F and Mg were observed. The peak of Si, which is the main constituent element of asbestos, almost disappeared. This result shows that Si in asbestos (3MgO '2SiO · 2Η〇) was eluted by chemical treatment, and magnesium fluoride was formed by the remaining Mg and F. This is shown in the X-ray diffraction pattern of the sample after 15 minutes of chemical treatment shown in Fig. 10. This can also be explained by the fact that a rutile MgF phase was confirmed. In other words, it was revealed that asbestos was transformed into powdered magnesium fluoride by elution of Si in the composition after 15 minutes of chemical treatment. That is, the disappearance of asbestos crystal molecules and the formation of magnesium magnesium were confirmed.

[0032] As described above, it has been proved that asbestos can be completely eliminated by chemical treatment.

This is a treatment of heavy metal ions generated as a result of the decomposition process. This is an international patent application PCT / JP2004 / 004753 [H16.3.31] (Title of Invention: Treatment Method for Strong Acid Waste Water Containing Hazardous Substances, Application People: Olympus New Century Yuli Co., Ltd., Kagawa University, Inventors: Kakegawa Toshio, Suenaga Yoshihiro, Suganuma Shuzo) can be removed from asbestos-treated wastewater.

[0033] (Example 2)

Adsorbents such as polychlorinated aluminum chloride, aluminum sulfate, aluminum, aluminum oxide (alumina), iron powder, iron sand, etc. as adsorbents in a strongly acidic solution mixed with asbestos and hydrofluoric acid. After adding 10% (volume ratio), slaked lime (calcium hydroxide) was added to neutralize to pH 7-8. Thereafter, an arbitrary flocculant was added to the reaction mixture to form flocs (aggregates), which were dehydrated using a dehydrator or a filter, and separated into solids and treated water.

As a result of measuring the concentration of fluorine ions in the treated water using the lanthanum * alizarin complexone colorimetric method, the concentration was below 10 mg / L (ppm) of the fluorine ion emission standard as shown in the table below. Concentration (!! ¾ /!)

Metal ions

Before processing After processing

Fluorine ions 9 8 0 0 0 1.2 In the above experiment, it was also found that the flocculant can obtain a better fluorine ion removal effect when held in a strongly acidic state.

[0034] The treatment results of the combined contaminated wastewater of high concentration hydrofluoric acid and heavy metal ions by the above treatment method are shown below. Concentration (Z

Metal ions

Before processing After final processing

Fluorine ion

Boron ion

Cadmium ion

Antimony ion

The concentration after zinc ion treatment is sufficiently reduced.

Industrial applicability

[0035] The present invention provides (1) a chemical decomposition process I of asbestos chemical decomposition with hydrogen fluoride, or a combination of the decomposition process I and (2) a recovery process II or an insolubilization process III. Since the materials used are only a reaction tank, hydrofluoric acid and water, it can be processed at low cost, and it is safe because it does not generate high temperature or high pressure, and there is no special restriction on the size of the reaction tank. Mass processing is possible. Therefore, according to the present invention, a practical asbestos chemical decomposition detoxification treatment that is inexpensive and highly safe can be achieved.

In addition, the present invention can be implemented as a movable processing apparatus that can perform on-site processing because the force reaction time suitable for the processing system in the processing plant is short. The final product of the detoxification treatment by is non-hazardous calcium fluoride, magnesium fluoride, silicate, etc., which can be used as a source of fluorine instead of hotel stone.

Brief Description of Drawings

FIG. 1 is an overall process diagram in a decomposition processing method of the present invention.

FIG. 2 is an explanatory diagram of steps (1) to (3) of decomposition step I in the present invention.

FIG. 3 is an explanatory diagram of steps (4) to (5) of decomposition step I in the present invention.

FIG. 4 is an explanatory diagram of an apparatus used for the collection step II in the present invention.

FIG. 5 is an explanatory diagram of steps (1) and (2) of insolubilization step III in the present invention.

FIG. 6 is an explanatory diagram of step (3) of insolubilization step III in the present invention.

[Fig. 7] (A) is an external view of untreated asbestos dispersed in water, (B) is Aspes (C) is an external view of asbestos chemically treated for 24 hours.

[Fig. 8] Electron micrograph and restricted-field diffraction pattern, (A) Figure is untreated asbestos, (B) Figure is asbestos after 15 minutes chemical treatment, (C) Figure is asbestos after 24 hours chemical treatment Indicates.

FIG. 9 is an EDX spectrum diagram after 24 hours of chemical treatment.

Sono]] X-ray diffraction pattern after 15 minutes of chemical treatment.

Explanation of symbols

1 Storage bag

2 Reaction tank

5 lid

6 Stir crusher

7 Tank

8 Activated carbon tank

11 tanks

Claims

The scope of the claims

[1] Put untreated asbestos substance and water into the reaction tank,

Injecting hydrofluoric acid with

A method for decomposing asbestos, comprising decomposing asbestos with hydrofluoric acid while stirring the asbestos substance while stirring.

[2] a reaction vessel that can be sealed with water and untreated asbestos material;

A tank for injecting hydrofluoric acid into the reaction vessel;

An agitation pulverizer for agitating and crushing the asbestos substance in the reaction vessel;

It comprises a degasser for discharging the gas generated in the reaction vessel.

An asbestos decomposition treatment apparatus characterized by that.

[3] The residue after carrying out the decomposition treatment method of claim 1 is heated and separated into hydrogen fluoride and water to evaporate, and the evaporated gas is passed through water to form hydrofluoric acid. Recover hydrofluoric acid

An asbestos decomposition treatment apparatus characterized by that.

[4] A heating apparatus that heats the reaction tank that remains after the decomposition treatment method according to claim 1 is left, and a trap tank that allows the gas evaporated from the heated reaction tank to pass through the water. Have

An asbestos decomposition treatment apparatus characterized by that.

[5] A fluoride ion adsorbent and a metal ion adsorbent are added to the reaction mixture remaining after the decomposition treatment method according to claim 1 is performed,

Next, neutralize with stirring while adding neutralizer.

Furthermore, an aggregating agent is added to obtain an aggregate.

A method for decomposing asbestos, characterized in that

[6] A reaction tank capable of containing a reaction mixture remaining after the decomposition treatment method according to claim 1 is sealed, and

The reaction tank comprises a tank for injecting a fluoride ion adsorbent and a metal ion adsorbent, and a stirrer for stirring the reaction mixture in the reaction tank.

An asbestos decomposition treatment apparatus characterized by that.