JP2007222698A - Melting method and apparatus for mineral fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a treatment method for a mineral fiber capable of performing a detoxification/stabilization with an extremely high efficiency in a short time by suppressing an amount of energy consumed without making a facility for detoxification treatment of the mineral fiber to a large scale, and a treatment apparatus. <P>SOLUTION: An oxidation aqueous solution is added to the mineral fiber or a substance containing the mineral fiber and the mixture is crushed and stirred. The obtained compound is temperature-elevated and is irradiated with an electro-magnetic wave. When the mineral fiber is asbestos containing magnesium and silica or a substance containing asbestos, an oxidation aqueous solution is added to this and while the heated mixture is crushed and stirred, it is irradiated with an electro-magnetic wave to detoxify it in a short time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a treatment technique for detoxifying mineral fibers, mainly asbestos, which is a natural mineral fiber.

Among mineral fibers, serpentine (chrysotile) and hornblende (crocidolite, amosite) asbestos are lightweight and have excellent heat resistance, chemical resistance, insulation, soundproofing, etc. Since then, it has been used for various industrial products including building materials and heat insulation materials.
In recent years, it has been pointed out that especially asbestos has an adverse effect on the human body. Under normal environmental conditions, asbestos does not degrade or change semipermanently, but remains in the general environment for a long time. is there. For this reason, there is a strong demand for measures such as prohibiting widespread use as in the past, and quickly removing materials containing existing mineral fibers. Although most of the waste asbestos material has been buried, it is difficult to secure a new location.

  On the other hand, several methods for detoxifying asbestos have been proposed so far. For example, the thing of patent document 1 is adding the byproduct refined ash at the time of aluminum refining to waste asbestos material, and the processing method of the waste asbestos material baked at the temperature of 800 degreeC or more is disclosed. In Patent Document 2, a substance containing Si, Ca and / or Al is added to a material to be treated containing asbestos so as to satisfy a predetermined condition, and the obtained mixture is mixed at 400 ° C. to 1200 ° C. A method of heat treatment is described.

JP-A-6-134438 JP2003-94006

Asbestos is a fibrous form with high tensile strength and flexibility, it is a very stable substance and difficult to decompose. In order to decompose this, it is necessary to treat the stable substance (silicon oxide SiO2, magnesium oxide MgO, iron oxide FeO), which is a characteristic of asbestos, by heating it at a high temperature and melting it. I must. For this reason, it is not easy to newly establish or add a waste treatment facility containing asbestos, which is expected to increase rapidly in the future. In addition, the decomposition requires a large amount of energy, and as a result, it is inevitable that a large amount of CO ₂ is emitted.

  In addition, when collecting waste materials containing asbestos and transporting them to a treatment facility, there is a problem of asbestos scattering and loss. From the viewpoint of worker health management and to avoid secondary environmental degradation, as much as possible. This must be suppressed.

  The present invention has been made in view of such circumstances, and suppresses energy consumption without increasing the size of facilities for detoxifying mineral fibers, making it extremely harmless in a short time. A technical problem is to provide a mineral fiber treatment method and treatment apparatus that can be stabilized.

As a result of various studies, the present inventor added mineral aqueous fibers or materials containing mineral fibers to which an oxidizing aqueous solution was added and crushed and mixed, and when such workpieces were irradiated with electromagnetic waves, It has been found that melting is greatly accelerated, and the present invention has been completed.
In this case, it is presumed that detoxification treatment is performed by decomposing silicon oxide SiO ₂ , magnesium oxide MgO, iron oxide FeO, etc., which are stable substances contained in mineral fibers typified by asbestos. .

  The treatment method of the present invention is characterized in that an aqueous oxidizing solution is added to a mineral fiber or a substance containing mineral fiber, and the mixture is crushed and stirred, and the resulting mixture is heated, and then irradiated with electromagnetic waves. ,

  The mineral fiber to be melt-processed by the treatment method of the present invention contains magnesium and silica, and asbestos is a mineral fiber derived from the nature of serpentinite (chrysotile) and hornblende (crocidolite, amosite, etc.). However, it can be widely applied to other mineral fibers and artificial mineral fibers. ,

As the oxidizing aqueous solution, oxalic acid, hydrochloric acid or the like can be used. In this case, the acid concentration is increased or decreased depending on the amounts of silicon oxide: SiO ₂ and magnesium oxide: MgO in the material to be treated. The pH of the mixture is preferably adjusted to about 1 to 4.
When a fluoride is added to the object to be treated together with an oxidizing aqueous solution, melting is further promoted. For example, hydrofluoric acid (hydrogen fluoride) can be used as the fluoride.

  In addition, by irradiating electromagnetic waves while continuously moving the mixture, it becomes possible to detoxify the substance to be treated continuously, for example, effectively detoxify a large amount of asbestos or a substance containing the same. it can. Substances containing asbestos are various products mainly using asbestos, including building materials such as slate, vinyl tiles, outer wall materials, interior materials, chemical plant piping and equipment gaskets and packing, heat-resistant electrical insulation plates, brakes Lining etc. can be illustrated.

  In the present invention, when irradiating electromagnetic waves, the object to be treated to which the oxidizing aqueous solution has been added is moved while being rotated so that the direction of irradiation is changed. Can be irradiated without any problems. Such a process can be realized by installing a rotary kneading blade in a melting container for storing the object to be processed, thereby moving the object to be processed while crushing and kneading the object to be processed.

  When the electromagnetic wave is irradiated as described above, the electromagnetic wave is irradiated over a wide range to the object to be processed, and the melting is further promoted.

  When the object to be processed is crushed and stirred while being heated in the melting container, the mineral fiber or a substance containing the mineral fiber and the oxidizing aqueous solution are uniformly mixed. Then, the acid penetrates into the fiber of the mineral fiber, and heat is generated from the inside of the mineral fiber by the electromagnetic wave irradiation, so that the magnesium contained in the mineral fiber is dissolved in a short time. Then, for example, in the chrysotile that occupies most of asbestos (about 85%), the decomposition of magnesium progresses, the aspect ratio of the fibers changes, and the number of fibers and the fiber length decrease. As a result, when about 80% of magnesium is decomposed, the fiber itself is melted.

In chrysotile, when the decomposition of magnesium, which is its basic component, proceeds to 45%, the carcinogenic rate decreases rapidly. If it progresses to 65%, the carcinogenic rate becomes the same as that of the glass fiber, and if the melting of 80% or more proceeds, the carcinogenicity is hardly exhibited.
As described above, by adding a fluoride to the oxidizing aqueous solution and irradiating it with electromagnetic waves, the melting of the fibers is further promoted and the decomposition of the chrysotile is accelerated.

Only the mineral fiber or a mixture of the oxidizing solution and the oxidizing aqueous solution generates heat by the electromagnetic wave irradiation, and the peripheral devices and the like hardly raise the temperature. Therefore, also in this respect, the thermal efficiency is high and the energy consumption can be reduced.

  In this case, for example, for asbestos, the heating temperature is preferably in the range of 80 to 150 ° C, more preferably about 100 ° C, and the mixture heated to this temperature is crushed and stirred. On the other hand, if it is irradiated with electromagnetic waves, the detoxification process is completed in a short time.

  Here, as for the frequency of the electromagnetic wave irradiated to the mixture of asbestos or the thing containing this, and oxidation aqueous solution, the range of 300 MHz-30 GHz is suitable. By irradiating electromagnetic waves of this frequency, the water molecules contained in the mixture vibrate vigorously at a frequency of several hundreds of millions to billions of times / second, the asbestos heats up to a high temperature, and melting by the acid progresses instantly. To do.

  Further, by kneading the mixture in the melting container, the stirred kneaded material continues to cover the inner wall surface of the melting container, the surface of the stirring member, and the like. Even if the surface of the stirring member is a metal material, it will not be irregularly reflected, and almost all of the irradiated electromagnetic wave will be absorbed by the kneaded material. Therefore, the kneaded material generates heat efficiently, and melting is greatly promoted.

  In this way, if the mixture is continuously stirred in the melting container, the absorption efficiency of the irradiated electromagnetic wave increases, and the melting of magnesium, silica, and the like proceeds rapidly, so that asbestos is rendered harmless in a short time. be able to. In the method of the present invention, for example, asbestos or a substance containing the same and an oxidizing aqueous solution are uniformly mixed, and asbestos is mainly converted to calcium carbonate after the treatment. Therefore, no harmful substances remain or are generated, and even if they are discarded, there is no problem of environmental pollution.

  Next, the mineral fiber melting apparatus according to the present invention includes a melting container containing a mineral fiber or a mixture of mineral fiber and an object to be treated and an aqueous oxidizing solution added thereto, and the temperature of the mixture contained in the melting container is increased. Heating means for stirring, stirring means for stirring the mixture to form a kneaded product, and electromagnetic wave irradiation means for irradiating the kneaded product with electromagnetic waves.

  By adopting such a configuration, a kneaded material formed by heating and stirring a mineral fiber or a mixture of a mineral-containing material to be treated and an oxidizing aqueous solution in a melting vessel is kneaded continuously or intermittently. It becomes possible to irradiate with electromagnetic waves. Therefore, it is possible to greatly promote the decomposition of the mineral fibers, the melting process can be performed in a short time, and the amount of energy required for the process can be reduced.

  By arranging the electromagnetic wave irradiation means at a plurality of locations of the melting container, it becomes possible to irradiate electromagnetic waves evenly to the mixed object to be processed in the melting container. Can be promoted.

A twin-screw kneader, for example, a pair of screw sets including a kneading segment equipped with kneading blades can be disposed in the melting container.
Further, the biaxial kneader may be one in which the two rotating blades rotate so as to rotate and revolve (planetary movement), respectively.

If a melting container having the above-described kneading apparatus installed therein is used, the object to be processed is sufficiently kneaded, so that the electromagnetic wave absorption efficiency is increased and the melting can be further promoted.
Further, according to the mineral fiber melting apparatus provided with the melting container, since the heating process, the crushing / mixing process and the electromagnetic wave irradiation process for the object to be processed are integrated, the processing equipment can be simplified. Since there is no heat loss generated between processes, energy efficiency can be increased. According to the treatment method and treatment equipment of the present invention, the amount of CO ₂ emission is greatly reduced.

  Furthermore, the melting device can be configured to be easily transportable. Therefore, if the transportable melting container is transported to the processing site for the waste material containing asbestos and subjected to the detoxification process, there is an advantage that it is possible to suppress the scattering and loss of asbestos that occurs when collecting and transporting the waste material.

According to the present invention, mineral fiber, particularly asbestos, is easily harmless by adding an oxidizing aqueous solution to mineral fiber or a substance containing mineral fiber, heating, crushing, stirring, and directly irradiating the mixture with electromagnetic waves. It is possible to
Moreover, the scale can be simplified compared with the conventional melting processing equipment, and it can also be reduced in size so that the whole equipment can be conveyed.
Furthermore, in the processing of waste materials containing asbestos, which will increase rapidly in the future, it is possible to reduce the processing cost and to realize a large amount of processing in a short time.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is an overall schematic view of the melting processing apparatus of the present invention, FIG. 2 is a side view showing details of an electromagnetic wave irradiation processing unit, and FIG. 3 is a diagram showing the structure of an electromagnetic wave generator.

  As shown in FIG. 1, an asbestos-containing material that has been carried by a transport vehicle or the like, for example, a building material such as a slate plate, is stored in a receiving tank 71 and then reserved by a high concentration continuous quantitative transfer pump (not shown). It is sent to the heater 72. Then, an oxalic acid aqueous solution is supplied from the oxidizing aqueous solution storage tank 73. Here, an oxidizing aqueous solution having an oxalic acid concentration of 5 to 20% by weight is added to the preheater 2 at a rate of 5 to 30% by weight, heated to 90 to 95 ° C., and then fed into the kneader 74. . The preheater 2 is heated to a predetermined temperature by the steam 77.

A screw conveyor that is rotationally driven by a motor 18 is installed in the kneader 4 having a hopper-shaped inlet at one end and an outlet at the other end, and is sent from the preheater 2 to the inside from the inlet of the kneader 4. The kneaded material 19 thus discharged is sequentially discharged from the outlet.
The kneaded material 19 is placed on the conveyor 20 and conveyed to the electromagnetic wave irradiation processing unit 21. In the electromagnetic wave irradiation processing unit 21, a plurality of electromagnetic wave irradiation machines 75 are arranged above the conveyor 20 along the conveying direction of the conveyor 20.

  As shown in FIG. 2, in the electromagnetic wave irradiation unit 21, the supply adjuster 22 for the kneaded material 19 is disposed near the start end of the conveyor 20, and a plurality of electromagnetic wave irradiation devices 75 are disposed above the conveyor 20. A curing floor 25 is disposed near the end of the conveyor 20, and a microwave guide 26 is disposed in the conveyor 20.

  The kneaded product 19 is irradiated with electromagnetic waves of 2450 MHz for 1 to 15 minutes during its conveyance. At this time, in the kneaded material 19, it is considered that the melting of magnesium mainly proceeds rapidly. The electromagnetic wave irradiation conditions can be adjusted within a frequency range of 300 MHz to 30 GHz (wavelength 1 cm to 1 m) and an irradiation time of 1 to 30 minutes.

  As shown in FIG. 3, the electromagnetic wave irradiator 75 includes a microwave oscillator 23, an isolator 24 for preventing leakage of generated electromagnetic waves, a directional coupler 27 for transmitting electromagnetic waves, from above to below. A power monitor 29, a matching unit 30 and a fixed distributor 31, an irradiation unit 32 for irradiating an object to be processed with electromagnetic waves, and the like are sequentially arranged.

  Since the kneaded material 19 placed on the conveyor 20 through the supply adjusting device 22 is irradiated with electromagnetic waves generated by the microwave oscillator 23, melting progresses rapidly during its conveyance. The melting process is completed within a short time until it reaches.

The object 19 to which the electromagnetic wave irradiation has been completed is sent to an external storage container 78.
In the melting treatment as described above, only the kneaded material 19 generates heat due to the electromagnetic wave irradiation, and the peripheral devices and the atmospheric gas are hardly heated, so that the thermal efficiency is high and the energy consumption can be reduced. Further, by heating the kneaded material 19 to about 80 to 95 ° C. and then irradiating it with electromagnetic waves, the heat conversion efficiency can be increased to about 70%.

  Further, for example, by irradiating an electromagnetic wave having a frequency of 2,450 MHz, the dipole moment of water molecules contained in the kneaded material 19 vibrates violently (several hundred million to several billion times / second), and fiber particles constituting asbestos. Since the inside heats up to a high temperature and the melting proceeds instantaneously, the melting process that conventionally required several hours to several tens of hours can be completed in a few minutes.

  If the kneaded material 19 is kneaded to form a slurry, heat can be efficiently generated by electromagnetic wave irradiation. Moreover, since it can adjust to the amount of oxidizing aqueous solution minimum required for decomposition | disassembly, waste liquid discharge | emission amount can be reduced.

  The present invention is not limited to this embodiment. Depending on the type, component, and property of the substance containing asbestos, etc., the component, concentration, and addition amount of the oxidizing aqueous solution to be added may be changed. Efficient processing can be performed by appropriately changing the amount of moisture, the properties, the frequency of the electromagnetic wave to be irradiated, the irradiation time, and the like.

  In addition, by arranging electromagnetic wave irradiation means at multiple locations in the melting container, it becomes possible to irradiate the kneaded material in the melting container uniformly with electromagnetic waves, so that the electromagnetic wave absorption efficiency is increased and melting is promoted. Can be made.

(Embodiment 2)
As shown in FIGS. 4 to 7, the melting processing apparatus 1 of this embodiment includes a melting container 2 that contains a mixture obtained by adding an oxidizing aqueous solution to a substance containing asbestos, and a mixture contained in the melting container 2. Heating means for raising the temperature (gap 7, inlet 8, drain 9, etc.), kneading means (rotating shaft 5, stirring member 6, etc.) for stirring the mixture to produce a slurry-like or mud-like kneaded product, Electromagnetic wave irradiation means for irradiating the kneaded material with electromagnetic waves (electromagnetic wave irradiation port 13, oscillation device 15, waveguide 17 and the like) is provided.

  If the structure provided with the melting container 2 as described above, the mixture can be irradiated with electromagnetic waves while kneading the mixture formed by heating and stirring the mixture continuously or intermittently. Asbestos melting can be greatly promoted.

  In the melt processing apparatus 1 of the present embodiment, a rotating shaft 5 driven by a motor 4 is arranged coaxially with a central axis in a cylindrical melting vessel 2 arranged so that its central axis is horizontal. Has been. On the rotating shaft 5, four stirring members 6 that are curved in directions different by 90 degrees from the base to the tip are arranged at equal intervals. The wall surface of the melting container 2 has a double structure provided with a gap 7 for circulating the heating steam. In addition, a plurality of inlets 8 for feeding warming high-pressure steam into the gap 7 are provided at the side of the melting vessel 2, and the steam fed into the gap 7 is provided at the bottom of the melting vessel 2. A plurality of drains 9 for discharging are installed. It is possible to keep the temperature in the melting container 2 at about 80 ° C. to 120 ° C. by sending high-pressure steam for heating into the gap 7 from the inlet 8 and circulating in the gap 7.

  On the upper part of the melting container 2, a charging port 11 with a slide-type opening / closing lid 10 for feeding a workpiece into the melting container 2 and an inspection manhole 12 are provided. A plurality of electromagnetic wave irradiation ports 13 are attached toward the inside. On the front surface of the melting container 2, a discharge port 14 for taking out a melted object to be processed from the melting container 2 is provided.

  On the rack 16 provided on the side of the melting container 2, one oscillating device 15 for supplying an electromagnetic wave to the electromagnetic wave irradiation port 13 is disposed for each electromagnetic wave irradiation port 13. Each of the electromagnetic wave irradiation ports 13 is connected by a waveguide 17.

  In the case where a predetermined treatment is performed using the melting apparatus 1, a mixture formed by adding an aqueous solution to the composition is introduced into the melting container 2 from the inlet 11 by opening the opening / closing lid 10, The mixture contained in the container is heated with water vapor introduced from the introduction port 8, the motor 4 is driven to rotate the stirring member 6, and the mixture is stirred to form a kneaded product. While the kneaded product is continuously stirred by the stirring member 6, the kneaded product is directly irradiated with electromagnetic waves from the plurality of electromagnetic wave irradiation ports 13.

  In such a process, the kneaded material that is continuously stirred while being heated in the melting vessel 2 is uniformly mixed with, for example, an oxalic acid aqueous solution, so that the acid necessary for melting penetrates. Then, melting proceeds due to heat generated from the inside of the particles due to electromagnetic wave irradiation from the plurality of electromagnetic wave irradiation ports 13. The object to be processed melted in the melting container 2 is taken out from the discharge port 14.

(Embodiment 3)
FIGS. 8A and 8B are diagrams showing another embodiment of the melting container. As in the second embodiment, the melting container is provided with a heating means and an electromagnetic wave irradiation means for irradiating the kneaded material with an electromagnetic wave.
In the melting vessel 50, the first shaft 55a and the second shaft 55b are rotatably arranged in parallel so that a pair of stirring screws used in a biaxial kneading mixer and the like are arranged and rotated. Support this freely. Such a stirring screw is well known, and its outline will be described next.

An outer mixing paddle 56a and an inner mixing paddle 57a that form the stirring and conveying unit I are attached to the first shaft 55a, respectively, and an outer mixing paddle for forming the stirring turning portion II on one end side (rotation driving unit 59 side). 56b and an inner mixing paddle 57b are provided.
Similarly, an outer mixing paddle 56a and an inner mixing paddle 57a for forming the agitating and conveying portion I are respectively attached to the second shaft 55b, and an outer mixing paddle 56b for forming the agitating turning portion II on the other end side. And an inner mixing paddle 57b.

The outer mixing paddle 56a includes a radially extending arm 62 of each shaft 55a or 55b and a blade 63a attached to the tip of the arm 62 so as to be inclined with respect to the rotation direction.
On the other hand, the outer mixing paddle 56b is also provided with a blade 63b inclined at the tip of the radially extending arm 62 of each shaft 55a, 55b in the direction opposite to the blade 13a of the outer mixing paddle 56a of the agitating and conveying unit I with respect to the rotational direction. I have.

The shafts 55 a and 55 b rotate in the direction indicated by the arrow X by the rotation of the motor 100 in the rotation drive unit 59.
When the workpiece 67 is introduced into the mixing pan 51 through the introduction port 52 provided in the upper part of the melting container 50, the mixing paddles on the outer side and the inner side of the agitating and conveying unit I attached to both rotating shafts 55a or 55b. The workpieces are kneaded while being turned up and down by the mixing paddles 56b and 57b on the outside and inside of the stirring turning section II. At this time, the kneaded material located in the stirring turning portion II is pushed out to the stirring and conveying portion I side along the respective shaft 55a or 55b by the inclination of the blade 63b of the outer mixing paddle 56b and the blade 64b of the inner mixing paddle 57b. be able to.

On the other hand, as shown in FIG. 8B, in the agitating and conveying unit I of the first shaft 55a and the second shaft 55b, the workpieces positioned in the agitating and conveying unit I by the outer and inner mixing paddles 56a and 57a. Are moved along the respective shafts 55a or 55b in the direction of the stirring turning section II. When the object to be processed reaches the stirring turning portion II at one end of the shaft 55a or the other end of the shaft 55b, the stirring feeding portion I is mixed with the mixing paddles 56b and 57b on the outside and inside. Since the movement in the opposite direction is imparted to the object to be conveyed from the position, the object to be treated that has lost its destination is displaced in the direction of movement and moved to the stirring and conveying part I of the adjacent shaft 55a or 55b. To do.
In this way, by repeatedly transporting the shafts 55a and 55b by the stirring transport unit I and the stirring turning unit II, the object to be processed is circulated in the horizontal direction (arrow 66 direction) in the mixing pan 51, It can also be kneaded with stirring in the horizontal direction.

  In this embodiment, the kneading part having the structure as described above is provided, and the object to be treated is stirred and is in a kneaded state while being circulated and moved in the horizontal direction in the melting container. Irradiated. Therefore, asbestos and the like can be reliably melted in a short time.

1. Treatment Method Asbestos was melt-treated under the following conditions using the apparatus shown in FIG.
An appropriate amount of slate material containing asbestos was immersed in an oxidizing aqueous solution having an oxalic acid concentration of 10% by weight and heated to 92 ° C. Then, the electromagnetic wave of 2,450 MHz was irradiated for 3 minutes to the mixture obtained by mixing this.

2. Analysis of final processed material The sample which is the final processed material obtained by the above method was subjected to X-ray diffraction using an X-ray diffractometer (manufactured by JEOL Ltd., JXD-3500K). The results are shown in FIG.
Examining this diffraction pattern, it is quite different from the chrysotile X-ray diffraction pattern a shown in FIG. In the diffraction pattern of this sample (FIG. 9), there is a peak at 3.030, but as shown in FIG. 10, the first diffraction line (002) and the second diffraction line (004) seen in the chrysotile Since no peak exists at such a position, it can be determined that chrysotile is not contained in the sample.

The X-ray diffraction pattern (FIG. 9) of this sample is different from the X-ray diffraction pattern b of amosite, which is another asbestos shown in FIG. 10, and the X-ray diffraction pattern c of crocidolite. Amosite and crocidolite have two peaks (110, 310), but there is one large peak (3.030) in this sample. Therefore, other asbestos is not contained in the sample.
Note that the sample is determined to be calcium carbonate based on the X-ray diffraction pattern of FIG.
From the above results, it can be seen that the chrysotile treated by the method of the present invention was melted and altered to be harmless.

1 is an overall schematic view of a melt processing apparatus of the present invention. It is a figure which shows the detail of an electromagnetic wave irradiation process part. It is a figure which shows the structure of an electromagnetic wave irradiation machine. It is a front view of the fusion treatment apparatus in other embodiments. It is a front view which shows the structure of a melting container. It is a top view of the melting processing apparatus in other embodiments. It is a side view which shows the structure of a melting container. It is a figure which shows the structure of the melting container in other embodiment. (A) is a top view which shows the internal structure, (b) is the sectional view on the AA line in (a). It is a figure which shows the result of the X-ray diffraction of a sample. It is a figure which shows the result of having carried out X-ray diffraction about 3 types of asbestos.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 50 Melting apparatus 2 Melting container 4, 18 Motor 6 Stirring member 13 Electromagnetic wave irradiation port 15 Rotating shaft 19 Kneaded material 20 Conveyor 21 Electromagnetic wave irradiation part 75 Electromagnetic wave irradiation machine

Claims (9)

  A method for melting mineral fibers, comprising adding an aqueous oxidizing solution to a mineral fiber or a substance containing mineral fibers, crushing and stirring the mixture, raising the temperature of the resulting mixture, and irradiating the mixture with electromagnetic waves.   The said mineral fiber contains magnesium and a silica, The melt processing method of the mineral fiber of Claim 1 characterized by the above-mentioned.   The mineral fiber melting method according to claim 1 or 2, wherein the mineral fiber is asbestos.   The method for melting mineral fibers according to any one of claims 1 to 3, wherein a fluoride is added to the object to be treated together with an oxidizing aqueous solution.   5. The method for melting mineral fibers according to claim 1, wherein the mixture is irradiated with electromagnetic waves while continuously moving.   The method for melt treatment of mineral fibers according to any one of claims 1 to 5, wherein the mixture is continuously crushed and stirred while being accommodated in a melting container containing a mixer.   A melting container that contains the mineral fiber or a mixture of mineral fibers added with an oxidizing aqueous solution, a heating means that raises the temperature of the mixture contained in the melting container, and a kneaded product obtained by stirring the mixture An apparatus for melting mineral fibers, comprising: stirring means for forming; and electromagnetic wave irradiation means for irradiating the kneaded material with electromagnetic waves.   The mineral fiber melting process according to claim 7, wherein the melting container has a built-in mixer for crushing and mixing the mineral fiber or the object to be processed containing the mineral fiber, and the electromagnetic wave irradiation means is installed. apparatus   The mineral fiber melting apparatus according to claim 7 or 8, wherein a pair of screw sets including a kneading segment including a kneading blade is disposed in the melting container.

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