JP2009000604A - Asbestos treatment system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an asbestos treatment system which, firstly, reduces the burden of cost of heat energy, secondly, can treat a large volume, thirdly, surely effects the detoxifying treatment, fourthly, further has excellence in safety and, fifthly, discharges as slug utilizable for a recycling material and the like. <P>SOLUTION: In the detoxifying treatment system of an asbestos waste material A including asbestos, it has a pretreatment means 1, a main treatment means 2 and posttreatment means 3. A melting furnace 12 of the pretreatment means 1 crushes the incorporated asbestos waste material A and makes an admixture C by blending a melting point lowering agent B such as borax and the like. The main treatment means 2 pyrolyzes the admixture C of the asbestos waste material A with low temperature and then discharges the same as slug F by conducting the melting, vitrification and non-fiberization. The posttreatment means 3 utilizes the discharged exhaust gas for heating and purifies the same. The system is also possible to mount on automobiles. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an asbestos treatment system. That is, it is related with the system which detoxifies asbestos waste material containing asbestos.

《Technical background》
Asbestos, which is asbestos, is a fibrous natural mineral with a fine acicular crystal structure with a structure containing magnesium and silicon, and has excellent heat resistance, chemical stability, chemical resistance, friction resistance, insulation, etc. For example, slate materials, building materials, spray materials, coating materials, heat insulating materials, heat insulating materials, packing materials, soundproof materials, insulating materials, brake lining materials, and other applications have been widely used.
However, in recent years, carcinogenicity and other health problems due to inhalation of fiber dusts from such asbestos products have been recognized, which has become a major social problem.
Therefore, recently, there is an urgent need to regulate and dispose of asbestos products, and dismantling and removal of asbestos products and the treatment of asbestos waste materials discharged from the disposal site have become major themes. In particular, detoxification treatment of asbestos waste materials used as slate materials and other building materials has become a major theme.

<Conventional technology>
Conventionally, asbestos waste has been landfilled in strict specially managed final disposal sites as specified controlled substances and specified controlled industrial waste, and the processing cost burden has been enormous.
In view of this, various processing systems have been recently proposed that are made harmless while avoiding the risk of dust scattering and ensuring safety. In other words, various technologies have been proposed that enable landfill processing, etc., at a general stable final disposal site, regardless of landfill processing at a strictly specially managed final disposal site.
For example, a processing system that thermally decomposes asbestos waste at a high temperature of 1,000 ° C. or higher, for example, about 1,500 ° C., to be melted, vitrified, or non-fibered has been proposed. More recently, a treatment system has also been proposed in which asbestos waste is thermally decomposed at a relatively low temperature of 1,000 ° C. or lower to be melted, vitrified, or non-fibered.

《Information on prior art documents》
Examples of this type of asbestos treatment system include those disclosed in the following Patent Documents 1, 2, 3, and 4 and Patent Documents 5 and 6.
Patent Documents 1, 2, 3, and 4 relate to the former, that is, an asbestos processing system at a high temperature, and Patent Documents 5 and 6 relate to the latter, that is, an asbestos processing system at a relatively low temperature.
JP 62-237984 A Japanese Patent Publication No. 4-28648 Japanese Patent No. 3120308 Japanese Patent Laid-Open No. 4-226677 Japanese Patent No. 3830492 Japanese Patent No. 3747246

By the way, the following problems have been pointed out with respect to such a conventional example.
<First problem>
First, regarding the asbestos treatment system at a high temperature of 1,000 ° C. or higher, the energy cost burden has been difficult, which has been a major obstacle to practical use.
That is, for example, all of the techniques disclosed in Patent Documents 1, 2, 3, and 4 require high-temperature processing at 1,000 ° C. or higher, for example, about 1,500 ° C., and during processing, It has been pointed out that the heat energy consumption burden is enormous because it is necessary to keep it at a high temperature of about 500 ° C.

<< Second problem >>
Secondly, the asbestos treatment system at a low temperature of 1,000 ° C. or less has solved the problem of the burden of energy cost described above, but has a difficulty in mass treatment, and is currently in a practical application study stage. ing.
For example, in the techniques disclosed in Patent Documents 5 and 6, pressure treatment, pressure reduction treatment, immersion treatment, and the like are essential, and as a result, the treatment process becomes complicated and the treatment cost increases. It has not been fully adopted.

《Third problem》
Thirdly, there are some concerns about the accuracy, certainty, stability, etc. of the detoxification treatment of asbestos waste materials, and this system is still in the practical application study stage.
For example, the techniques disclosed in Patent Documents 4 and 5 can be evaluated as an asbestos treatment system at 1,000 ° C. or lower. However, it has not yet been established as a system for completely detoxifying asbestos waste materials with high accuracy and by melting, vitrifying, and non-fibrosis. It has not been established as a system before ensuring certainty.

<< About the present invention >>
The asbestos treatment system of the present invention has been made in order to solve the above-described problems of the conventional example in view of such a situation.
The present invention is firstly cost-reduced, secondly capable of mass processing, thirdly detoxified, surely realized, fourthly excellent in safety, The purpose is to propose an asbestos treatment system that can be used effectively as a recycled material for waste slag.

<About Claim>
The technical means of the present invention for solving such a problem is as follows. First, claim 1 is as follows.
The asbestos treatment system of claim 1 is a detoxification treatment system for asbestos waste material containing asbestos, and has pretreatment means and main treatment means.
The pretreatment means pulverizes the introduced asbestos waste material and mixes with borax or other melting point depressant to form a mixed material. The main treatment means is characterized in that the mixed material of the asbestos waste material is pyrolyzed at low temperature, and is discharged after being melted, vitrified, or non-fibered.

About Claim 2, it is as follows. The asbestos treatment system according to claim 2, wherein in the pretreatment means, the pretreatment means has a hermetically pulverized portion that dusts the asbestos waste material into a fine powder in an inert gas atmosphere, and its scattering. A sensor capable of detecting a dust concentration, and a mist injector that dusts the dust by mist injection when the sensor detects a high concentration.
About Claim 3, it is as follows. In the asbestos treatment system according to claim 3, in claim 1, the pretreatment means finely pulverizes the asbestos waste material in an inert gas atmosphere, and thereafter packs the mixed material. Features.
About Claim 4, it is as follows. In the asbestos treatment system according to claim 4, in claim 1, the pretreatment means crushes the asbestos waste material, the crushed asbestos waste material, water, lime or blast furnace slag, the borax and the like. And a melting point depressant. Thus, the mixed material is characterized in that it is hardened substantially in a cement form and is divided into sizes that are easy to process.
About Claim 5, it is as follows. The asbestos treatment system according to claim 5 is the asbestos treatment system according to claim 2, 3 or 4, wherein a sensor capable of detecting the scattered dust concentration is provided adjacent to the outside in the vicinity of the pretreatment means. The sensor is capable of detecting when fine powdery dust is generated and scattered in the vicinity from the asbestos waste material before or after charging the pretreatment means. .

About Claim 6, it is as follows. In an asbestos treatment system according to a sixth aspect, in the first aspect, the main treatment means comprises a melting furnace. Then, the asbestos waste material is recycled at low temperature in the low temperature region of the temperature rising stage, and in the middle and high temperature region, iron oxide, vanadium, and other functionality-imparting materials are added, and the slag is recycled. It is characterized by discharging as a material.
About Claim 7, it is as follows. The asbestos treatment system according to claim 7 is characterized in that, in claim 6, the main treatment means uses a reduction furnace as the melting furnace and discharges the reduction slag as the slag.
About Claim 8, it is as follows. The asbestos treatment system of claim 8 is characterized in that, in claim 6, the main treatment means uses an oxidation furnace as the melting furnace, and discharges the oxidation slag made of ceramic ash as the slag. .

About Claim 9, it is as follows. In an asbestos treatment system according to an eighth aspect, in the first aspect, the treatment system is mounted on a vehicle. The asbestos waste material can be dismantled and moved to a discharge site, and the main processing means is an electric furnace.
About Claim 10, it is as follows. An asbestos treatment system according to a tenth aspect of the present invention further includes post-processing means in the first aspect. The post-processing means includes a heat utilization part of the high-temperature exhaust gas generated by the main treatment means, a cooling part for the exhaust gas, an adsorption removal part for harmful components in the exhaust gas, and the exhaust gas. And a dust collector for sucking out and discharging to the outside.

<About the action>
Since the present invention comprises such means, the following is achieved.
(1) Disassembled and discarded asbestos waste material is detoxified by this asbestos treatment system.
(2) First, the asbestos waste material is put into the pretreatment means of the present system, pulverized and mixed with a melting point depressant to become a mixed material.
(3) Typical pretreatment means include a type in which asbestos waste material is finely pulverized, a type in which the asbestos waste is further packed, a type in which the asbestos waste is roughly crushed and solidified into a substantially cemented state, and the like.
(4) Then, the mixed material of the asbestos waste material is subjected to low-temperature pyrolysis in a melting furnace, for example, a reduction furnace or an oxidation furnace, as a main processing means of the present system, and then a function-imparting material is added.
(5) In this way, the asbestos waste material is melted, vitrified, non-fibered, and discharged as slag of the harmless recycled material.
(6) In the post-processing means, the exhaust gas is heat-utilized and cleaned.
(7) Now, according to the asbestos treatment system of the present invention, firstly, the asbestos waste material that has been pulverized and mixed is subjected to low-temperature pyrolysis regardless of high-temperature pyrolysis, so the thermal energy burden is greatly reduced. .
(8) Since this system is not a complicated process, but a simple and easy process is systemized, a large amount of processing is possible. In particular, the process is simplified in the type that is hardened substantially in a cement form.
(9) This system employs a combination of the pulverization process of the pretreatment means, the melting point depressant mixing process, and the low temperature pyrolysis process of the main treatment means, so that the detoxification treatment is highly accurate. Realized reliably and stably. In particular, in the type that finely dusts, these become remarkable.
(10) Moreover, in the pre-processing means of this system, a type that employs a closed type shredder, a dust sensor, a mist injector, etc., a type that packs, a type that has a dust sensor adjacent thereto, and the entire system are mounted on the vehicle. The safety will be further improved if the type is to be used.
(11) Further, this system is expected to be used effectively after the fact. That is, the discharged slag is made of a recycled material with added functionality, and further made of oxidized slag such as reduced slag and ceramic ash. Exhaust gas is also used for heat.
(12) Now, the asbestos treatment system of the present invention exhibits the following effects.

<< First effect >>
First, the cost burden is reduced. That is, in the asbestos treatment system of the present invention, the asbestos waste material is pyrolyzed at a low temperature in a low temperature region in the main treatment means.
Therefore, the running cost is reduced, for example, the burden of heat energy consumption is greatly reduced as compared with the above-described conventional example that requires high-temperature treatment. Asbestos detoxification treatment is realized at low temperature and low cost.

<< Second effect >>
Second, a large amount of processing is possible. That is, in the asbestos treatment system of the present invention, the detoxification treatment is achieved by pulverizing and mixing asbestos waste material in the pretreatment means, and low-temperature thermal decomposition in the main treatment means.
As in the case of this type of conventional example, asbestos waste materials are made harmless by eliminating the need for pressure treatment, decompression treatment, immersion treatment, etc. Processing can be easily realized.
Furthermore, in the pretreatment method, when the method of roughly crushing asbestos waste material and solidifying it in a cement form is adopted, the treatment cost is further reduced compared to the method of finely pulverizing it into powder, and the mass treatment is further improved. It will be advantageous.

《Third effect》
Third, the detoxification process is reliably realized. That is, in the asbestos treatment system of the present invention, the asbestos waste material is detoxified with high accuracy and certainty by pulverization, mixing with a melting point depressant, and thermal decomposition. In particular, when a method for finely dusting asbestos waste material is adopted, thermal decomposition is further smoothed, and processing accuracy, reliability, stability, etc. are further improved.
Compared with the above-described conventional example, the plant conditions and system system for realizing the processing are optimized, specified, and clarified, so that asbestos waste can be made harmless. Of course, it is possible to dispose of landfills and landfills at a general stable landfill instead of a strict specially managed landfill, and it is also possible to use general landfill and offshore dumping at other sites. It is also expected to be reused as roadbed materials, road surface materials, and other various resources.

<< 4th effect >>
Fourth, it is excellent in safety. That is, in the asbestos treatment system of the present invention, when a closed type shredder is used as the pretreatment means, a mist injector that operates with a sensor for detecting the concentration of scattered dust is used in combination, so that an external worker or the like can be used. The risk of asbestos dust scattering is avoided and safe. Furthermore, when the packing method is employed, the risk of asbestos dust scattering to the outside is reduced and the safety is improved, although the asbestos waste material is finely dusted.
In addition, since a sensor for detecting the scattered dust concentration is externally attached in the vicinity of the pretreatment means, it is easy to call attention to the external scattering of asbestos dust from this surface, and the safety is improved. On the other hand, in the case where the asbestos treatment system is mounted on a vehicle, the detoxification treatment can be performed on-site, and the stability is also improved in this respect.

《Fifth effect》
Fifth, the waste slag can be effectively used as a recycled material. In other words, in the asbestos treatment system of the present invention, slag is discharged as a recycled material to which a functionality-imparting material is added in the main treatment means. Further, in the case of a reduction furnace, it is discharged as reducing slag, and in the case of an oxidation furnace, it is discharged as ceramic ash.
Asbestos waste material is melted, vitrified, non-fibrinated, and completely detoxified, and is thus provided with functionality and discharged, and is widely used for various purposes.
For example, when iron oxide and vanadium are attached, it is possible to meet the needs as a road surface material having magnetism. In the case of reduced slag, the adhesion of oxygen is easy, and the growth of algae and seaweeds is promoted when discarded to the ocean. In the case of oxidized slag made of ceramic ash, bactericidal action is added when it is landfilled due to its antibacterial properties. The generated exhaust gas can be effectively used by the post-processing means.
As described above, the effects exerted by the present invention are remarkably large, such as all the problems existing in this type of conventional example are solved.

《About drawing》
Hereinafter, the asbestos treatment system of the present invention will be described in detail based on the best mode for carrying out the invention shown in the drawings.
1, FIG. 2, FIG. 3, and FIG. 4 are explanatory views of the best cross section for explaining the best mode for carrying out the present invention. 1 shows a first example, FIG. 2 shows a second example, FIG. 3 shows a third example, and FIG. 4 shows a fourth example.

<< Outline of the Present Invention >>
The asbestos treatment system of the present invention is a detoxification treatment system for asbestos waste material A containing asbestos, and includes pretreatment means 1, main treatment means 2, and posttreatment means 3.
The pretreatment means 1 pulverizes the asbestos waste A that has been charged, and also mixes borax and other melting point depressants B into a mixed material C. The main processing means 2 pyrolyzes the mixed material C of the asbestos waste material A at low temperature, melts it, vitrifies it, makes it non-fibrous and discharges it. The post-processing means 3 exhausts the exhaust gas D that is incidentally exhausted while using heat and cleaning it.
In addition, asbestos, asbestos products, asbestos waste material A, its problems, etc., conform to the above-mentioned place as the technical background in the background art column.
The asbestos treatment system of the present invention is roughly as described above. These will be described in detail below.

<< About the pretreatment means 1 >>
First, the preprocessing means 1 of this asbestos processing system will be described with reference to each example. In the pretreatment chamber of the pretreatment means 1, the asbestos waste material A is introduced from the outside, and the introduced asbestos waste material A is first pulverized.
Regarding the significance of pulverization, from the stage where the asbestos waste A is generally finely pulverized, the asbestos waste A is generally roughly divided, crushed and crushed (of course, a small amount at the same time) However, it is grasped as a broad concept including various stages in the middle of the process until the dust is also incidentally generated (in this specification, pulverization is used in such a broad sense) To do).
And the asbestos waste material A grind | pulverized in this way is mixed with borax and other melting | fusing point depressants B next, and becomes the mixed material C. The ratio of asbestos waste A to borax is about 1: 5. The melting point depressant B that is a melting aid (melting agent) is typically borax (borax, that is, sodium tetraborate Na ₂ B ₄ O ₇ · 10H ₂ O), but is more widely used as sodium borate. A mixture of borax and sodium carbonate, boric acid, a mixture of boric acid and sodium carbonate, and calcium chloride, calcium carbonate, calcium hydroxide, and other alkaline melting agents can also be used.
The preprocessing means 1 is roughly as described above.

<< Regarding Preprocessing Means 1 of FIG. 1 >>
Next, the preprocessing means 1 in the example of FIG. 1 will be described. The pretreatment means 1 of the asbestos treatment system shown in FIG. 1 includes a hermetic shredder 5 in which the pulverization unit 4 finely pulverizes the asbestos waste material A in an inert gas atmosphere, and its scattered dust. A sensor 6 capable of detecting the concentration, and a mist injector 7 that instantaneously sinks the dust by mist injection when the sensor 6 detects a high concentration are provided.
The preprocessing means 1 of FIG. 1 will be described in further detail. First, the closed type shredder 5 disposed in the pulverization chamber of the pulverization unit 4 finely pulverizes the asbestos waste material A in a nitrogen atmosphere that is sealed after the asbestos waste material A is charged, that is, under dustproof / explosion proof specifications. Grind to form a dust.
Various types of publicly-known and publicly-used systems can be used as the sealed-type shredter 5, but for example, a self-impact pulverization type cross-shreter (manufactured by Sato Kogyo) is used.

The sensor 6 is disposed in the pulverization chamber of the pulverization unit 4 in which such a closed type shredder 5 is disposed, and detects and measures the dust concentration of the asbestos waste material A that is pulverized, scattered, and floated, Always monitor and manage.
As the sensor 6, an automatic measuring instrument that instantaneously detects and counts the number of (fibrous) fine particles in the air is used. For example, a trade name “FNM Fiber Network Monitor” (manufactured by Hattori Industry Co., Ltd.) Note that Japanese Patent Application No. 2006-288118) is used.
The mist injector 7 is attached to the pulverization chamber of the pulverization unit 4 and instantaneously detects the asbestos dust that is scattered and suspended in an emergency when the detected value of the asbestos dust concentration of the sensor 6 exceeds a predetermined value. A fine mist of water or the like is sprayed on the surface to adhere moisture, etc., and drop and sink to the lower part in a very short time. As the mist injector 7, for example, trade name “FIBER SHUT” manufactured by Hattori Industry Co., Ltd. (related to Japanese Patent Application No. 2006-288119) is used.

1 in FIG. 1 is a mixing part with the melting point depressant B. That is, at all times when the mist injector 7 does not operate as described above, the asbestos waste material A dusted in the pulverization chamber of the pulverization unit 4 is then supplied to the mixing unit 8 and mixed with the melting point depressant B. And mixed material C is formed.
On the other hand, a sensor 9 capable of detecting the scattered dust concentration is provided adjacent to the outside in the vicinity of such pretreatment means 1. This sensor 9 can detect when dust of the asbestos waste material A finely pulverized into powder is scattered from the asbestos waste material A before or after being charged into the pretreatment means 1 and scattered in the vicinity. ing.
That is, asbestos waste material A before being charged into the pretreatment means 1 may spontaneously scatter and float asbestos waste material A dust. Further, from the asbestos waste material A that is put into the pretreatment means 1 and pulverized, dust of the asbestos waste material A may leak out from the inside of the pretreatment means 1 and may be scattered and floated in the vicinity.
In such a case, the sensor 9 can detect them. The configuration of the sensor 9 is the same as that described above for the sensor 6.
The preprocessing means 1 in FIG. 1 is as described above.

<< Regarding Preprocessing Means 1 of FIG. 2 >>
Next, the preprocessing unit 1 in the example of FIG. 2 will be described. The pretreatment means 1 of the asbestos treatment system shown in FIG. 2 finely pulverizes the asbestos waste material A in an inert gas atmosphere and packs the mixed material C after the fact. .
Such pre-processing means 1 in FIG. 2 will be described in further detail. In the illustrated example, as in the example of FIG. 1 described above, the pulverizing section 4 includes a hermetic shredder 5, a sensor 6, and a mist injector 7. Similarly, after the pulverizing part 4, a mixing part 8 mixed with the melting point depressant B to form a mixed material C is disposed.
Unlike the example of FIG. 1, a packing unit 10 is disposed next to the mixing unit 8, and the packing unit 10 appropriately mixes and mixes the mixed material C into a bag container such as a resin. Each bag is packed and sealed and packed.
A sensor 9 is also provided adjacent to the outside in the vicinity of the preprocessing means 1 in FIG.
The preprocessing means 1 in the example of FIG. 2 is as described above.

<< Regarding Preprocessing Means 1 of FIG. 3 >>
Next, the preprocessing unit 1 in the example of FIG. 3 will be described. The pretreatment means 1 of the asbestos treatment system shown in FIG. 3 crushes the asbestos waste A, crushed asbestos waste A, water, lime or blast furnace slag, borax and other melting point depressants B. Thus, a mixed material C that is hardened into a substantially cement-like shape and divided into sizes that are easy to process is obtained.
Such pre-processing means 1 in FIG. 3 will be described in further detail. First, the pulverizing unit 4 roughly divides, crushes and crushes the asbestos waste material A as a whole. At that time, asbestos waste material A finely pulverized is also incidentally generated, but the amount is relatively small.
Then, the asbestos waste material A roughly cracked and crushed in this way is first substantially cemented by adding lime H or blast furnace slag while adding water in the mixing unit 8, and then Sand or other melting point depressant B is further added.
In this way, the crushed asbestos waste A is coated with lime H or blast furnace slag, borax, and the like together with the dust that is scattered and floated, and is mixed in a substantially cemented form while being encased. It becomes material C. And the mixed material C hardened in such a substantially cement form is divided | segmented for every magnitude | size suitable for a movement and a process in the distribution part 11. FIG.
A sensor 9 is also provided adjacent to the outside in the vicinity of the preprocessing unit 1 in FIG.
The preprocessing means 1 in FIG. 3 is as described above.

<< About the main processing means 2 >>
Next, the main processing means 2 used in common with each example will be described with reference to each example. The main processing chamber of the main processing means 2 of this asbestos processing system is supplied with the pulverized mixed material C of asbestos waste material A from the preprocessing means 1.
The main processing chamber of the main processing means 2 is typically composed of a melting furnace 12, and the mixed material C of the asbestos waste material A is subjected to low temperature pyrolysis in the low temperature region 13 in the temperature rising stage, and in the middle high temperature region 14. Then, iron oxide, vanadium, and other function-imparting materials E are added and discharged as a recycled material converted into slag F.

Such main processing means 2 will be further described in detail. As the melting furnace 12 of the main processing means 2, in the example of FIGS. 1 and 2, a reducing melting furnace such as a blast furnace is used, for example, coke is supplied together. In the example of FIG. 3, an oxidation melting furnace such as an electric furnace is used. Note that it is possible to freely select and change whether the reductive melting furnace or the oxidation melting furnace is used as the melting furnace 12.
In the melting furnace 12, the pulverized mixed material C of asbestos waste A is first subjected to low temperature pyrolysis in the low temperature region 13 in the temperature rising stage, so that it is melted, solidified, vitrified, and made non-fibrous. The
That is, the chemical formula is structurally decomposed and the shape is granulated. The temperature of the low temperature region 13 may be about 600 ° C. to about 800 ° C., for example, with the melting point depressant B mixed therein and further pulverized. Further, it may be about 500 ° C. or higher, may be about 1,000 ° C. or lower, and does not exceed at least 1,100 ° C.

In the melting furnace 12, after such melting, vitrification, and non-fibrosis, the middle to high temperature region 14 higher than the low temperature region 13, for example, about 1,000 ° C or about 1,100 ° C, Alternatively, the functional material E is added at a slightly higher temperature, for example, about 1,500 ° C.
That is, in the melting furnace 12, first, in the medium / high temperature region 14 after the low temperature region 13, the melting, vitrification, and non-fibrosis of the mixed material C of the asbestos waste material A in the previous low temperature region 13 are insufficient. If there is leakage or the like, it will be completely melted, vitrified, or non-fibrous using the temperature in the middle and high temperature region 14.
At the same time, in the melting furnace 12, the function-imparting material E is added to improve the subsequent utilization by utilizing the temperature of the medium-high temperature region 14. As the functional imparting material E, iron oxide and a magnetic material such as vanadium are representative, but these functional imparting materials E are smoothly added under the temperature of the medium-high temperature region 14.

Now, in the melting furnace 12 of the main processing means 2, the mixed material C of the pulverized asbestos waste material A is melted, vitrified, non-fibered, that is, made harmless by following such steps. And it becomes the granular or powdery slag F which can be used also as a recycled material, and is discharged | emitted from the bottom part of the melting furnace 12 of the main processing means 2. FIG.
In addition, when the melting furnace 12 consists of a reduction furnace, the slag F is discharged | emitted as reduction | restoration slag, and when the melting furnace 12 consists of an oxidation furnace, the slag F is discharged | emitted as oxidation slag consisting of ceramic ash. In FIG. 1, FIG. 2, and FIG. 3, G is air supplied from the bottom of the melting furnace 12 to the inside.
The main processing means 2 is as described above.

<< About post-processing means 3 >>
Next, the post-processing means 3 will be described with reference to the examples of FIGS. The asbestos treatment system further includes a post-processing unit 3, which includes a heat utilization unit 15 for the high-temperature exhaust gas D generated by the main processing unit 2 and a cooling unit for the exhaust gas D. 16, an adsorption removal unit 17 for harmful components in the exhaust gas D, and a dust collector 18 that sucks the exhaust gas D and discharges it to the outside.
Such post-processing means 3 will be further described in detail. First, from the upper part of the main processing means 2, a high-temperature exhaust gas D made of a reducing gas, an oxidizing gas or the like is incidentally generated and discharged. The exhaust gas D is first discharged and supplied to the heat utilization unit 15 of the post-processing means 3. The heat utilization unit 15 is made of, for example, a boiler, and the heat of the high temperature exhaust gas D is effectively utilized.
Since the exhaust gas D discharged from the heat utilization unit 15 is still high in temperature, the exhaust gas D is adsorbed through the cooling unit 16 and, if there is a possibility of containing some components, adsorption of activated carbon or the like to be interposed. The dust is sucked and collected by the dust collector 18 via the removal unit 17.
And from the dust collector 18, it becomes a completely detoxified gas and is diffused into the atmosphere. The dust collected by the dust collector 18 is sent again to the melting furnace 12 of the main processing means 2, where it is re-decomposed, melted, vitrified, and converted into slag F.
The post-processing means 3 is as described above.

<< About the vehicle mounted in Figure 4 >>
Next, vehicle mounting of this asbestos processing system will be described with reference to the example of FIG. The asbestos treatment system of the example of FIG. 4 is mounted on a vehicle 19 and can be moved to a site where the asbestos waste A is disassembled and discharged, and the melting furnace 12 of the main treatment means 2 is an electric furnace.
Such mounting on the vehicle 19 will be further described in detail. In the illustrated example, on a trailer 21 towed by a tractor 20, pre-processing means 1, main processing means 2, post-processing means 3 and the like constituting an asbestos processing system are mounted.
The preprocessing unit 1 has a configuration similar to that described above, and the preprocessing unit 1 shown in FIG. 1 is used in the illustrated example. As the melting furnace 12 of the main processing means 2, an induction heating type electric furnace is adopted, thereby realizing a compact size.
Although the post-processing means 3 has a configuration according to the above-described configuration, in the illustrated example, the heat utilization unit 15 and the adsorption removal unit 17 are not provided, and only the cooling unit 16 and the dust collector 18 are provided. A sensor 9 is attached to the preprocessing means 1 outside. In the figure, 22 is a power supply room.
This asbestos treatment system can be a system mounted on the vehicle 19 as shown in FIG. 4, that is, an asbestos treatment vehicle.

《Action etc.》
The asbestos treatment system of the present invention is configured as described above. Therefore, it becomes as follows.
(1) Asbestos waste A is discharged from the work site where the asbestos product is disassembled, removed, and discarded. And this asbestos waste material A is detoxified using the asbestos processing system of this invention.

  (2) First, the asbestos waste material A is carried in and put into the pretreatment means 1 of the asbestos treatment system. Then, in the pretreatment means 1, the mixture is pulverized and mixed with the melting point depressant B, so that the mixed material C is formed.

  (3) As the preprocessing means 1, various types can be adopted. For example, a type composed of a pulverizing unit 4 and a mixing unit 8, and a type in which the pulverizing unit 4 includes a dusting-type closed shreter 5, a sensor 6, a mist injector 7, etc. In addition, a type in which a pack unit 10 is provided (see the example of FIG. 2), or a type including a pulverization unit 4 for crushing, a mixing unit 8 into a substantially cemented state, and a distribution unit 11 (FIG. (See example 3).

(4) Thus, the mixed material C of the asbestos waste material A pulverized by the pretreatment means 1 is then supplied to the main treatment means 2 of the asbestos treatment system.
The mixed material C is first pyrolyzed at a low temperature in the melting furnace 12 of the main processing means 2, and then the functional material E is added. As the melting furnace 12, a reduction furnace or an oxidation furnace is used.

  (5) By following such steps, the asbestos waste material A is melted, vitrified, non-fibrated, rendered harmless, and recycled as slag F, which is discharged.

  (6) In addition, in the post-processing means 3 attached to the main processing means 2, the exhaust gas D that is incidentally discharged is heat-utilized, cleaned, and discharged (FIGS. 1, 2, and 2). (See example in FIG. 3).

(7) Now, according to the asbestos treatment system of the present invention, the following is obtained.
First, in this asbestos treatment system, the asbestos waste A is pulverized by the pretreatment means 1 and supplied to the main treatment means 2 in a state where the melting point depressant B is mixed. It is almost thermally decomposed.
Thus, the asbestos waste material A is not mainly thermally decomposed in the medium / high temperature region 14, and even if the asbestos waste material A may be thermally decomposed in the medium / high temperature region 14, it is only a complementary function. Therefore, it is not necessary to always maintain the inside of the melting furnace 12 as the middle / high temperature region 14, and the inside of the melting furnace 12 is merely changed to the middle / high temperature region 14 over time, intermittently, and accordingly, the heat energy burden correspondingly. Is greatly reduced.

(8) Further, in this asbestos treatment system, the asbestos waste material A is obtained by combining the pulverization process and the mixed material C conversion process in the pretreatment means 1 and the low temperature pyrolysis process in the main treatment means 2. Is detoxified.
As described above, since the processing is performed while being excellent in terms of cost by combining the simple and easy process systemization and combination without requiring complicated processing, it is possible to perform a large amount of harmless processing of the asbestos waste material A.
If pre-treatment means 1 adopts a method of roughly crushing asbestos waste material A into fine cement without making it finely dusted (see the example in FIG. 3), the processing is simple because it is not finely dusted. It is easy and excellent in processing cost, and is further advantageous for mass detoxification processing.

(9) Further, in this asbestos treatment system, the pulverization process in the pretreatment means 1, the mixing process of the melting point depressant B in the pretreatment means 1, and the low temperature pyrolysis process in the main treatment means 2 are performed. By adopting the system in combination, the detoxification treatment of the asbestos waste material A is reliably realized.
The asbestos waste A which has been pulverized and whose melting point has been lowered is detoxified with high accuracy, reliability and stability by such low-temperature pyrolysis. In particular, when the pretreatment means 1 adopts a method in which the asbestos waste material A is finely pulverized (see the examples of FIGS. 1 and 2), the low temperature pyrolysis in the pretreatment means 1 is further improved. It will be smoothly promoted, and accuracy, certainty, stability, etc. will be further improved.

(10) Moreover, in this asbestos treatment system, in the case where the pulverizing section 4 of the pretreatment means 1 employs the closed type shredder 5 and dusts the asbestos waste material A into a fine powder, its scattered dust concentration A mist injector 7 is used in combination with the high-concentration detection of the detection monitoring sensor 6 for detecting dust that has a high concentration and may be externally leaked. reference).
Further, when the pretreatment means 1 adopts a method in which the mixed material C is packed (see the example in FIG. 2), the asbestos waste material A is finely pulverized in spite of being pulverized. In the process toward the processing means 2, etc., the risk of asbestos dust leaking out and scattering outside is avoided. Further, when the mixed material C is temporarily stored between the pre-processing means 1 and the main processing means 2, the risk of leakage and scattering to the outside is also avoided because it is packed. As a result, the risk of external leakage and scattering of asbestos dust to the outside is surely avoided, and safety is ensured.
Further, a similar sensor 9 is provided adjacent to the outside in the vicinity of the pretreatment means 1, and the external scattering of asbestos dust is constantly monitored, and safety is also secured from this aspect.
Furthermore, in the example in which this asbestos treatment system is installed in the vehicle 19 (see the example in FIG. 4), the asbestos waste material A can be dismantled and discharged on site to be detoxified on-site. Will improve. That is, since the detoxification process is completed at the dismantling and discharging site, the risk that asbestos dust is scattered outside during the transportation from the dismantling and discharging site to the pretreatment means 1 and the final disposal site is reduced.

(11) Furthermore, effective use after the fact is expected. That is, in this asbestos treatment system, iron oxide, vanadium, and other functionality-imparting materials E are added in the main processing means 2, and the slag F is discharged as a recycled material with functionality.
The slag F is discharged as reducing slag when the melting furnace 12 of the main processing means 2 is a reducing furnace, and ceramic ash is discharged as oxidized slag when the melting furnace 12 is an oxidizing furnace.
Asbestos waste A is not only discharged as molten, vitrified, non-fibrous, and detoxified slag F, but in the illustrated example, it becomes slag F or the like to which various functions are provided in this way. And discharged. The incidentally generated exhaust gas D is utilized in the heat utilization section 15 of the post-processing means 3.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front cross-sectional explanatory diagram of a first example for explaining the best mode for carrying out the invention of an asbestos treatment system according to the present invention. It is for explanation of the best mode for carrying out the invention, and is a front sectional explanatory view of a second example. FIG. 5 is a front cross-sectional explanatory diagram of a third example for explaining the best mode for carrying out the invention. FIG. 7 is a front sectional view of a fourth example for explaining the best mode for carrying out the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pre-processing means 2 Main processing means 3 Post-processing means 4 Grinding part 5 Sealed type shredder 6 Sensor 7 Mist injector 8 Mixing part 9 Sensor 10 Packing part 11 Distributing part 12 Melting furnace 13 Low temperature area 14 Medium and high temperature area 15 Heat Utilization part 16 Cooling part 17 Adsorption removal part 18 Dust collector 19 Vehicle 20 Tractor 21 Trailer 22 Power supply room A Asbestos waste B B Melting point depressant C Mixture D Exhaust gas E Functionality imparting substance F Slag G Air H Lime

Claims (10)

It is a detoxification treatment system for asbestos waste materials including asbestos, having pretreatment means and main treatment means,
The pretreatment means pulverizes the charged asbestos waste and mixes it with borax or other melting point depressant,
The main treatment means is an asbestos treatment system characterized in that the mixed material of the asbestos waste material is pyrolyzed at low temperature, and is discharged after being melted, vitrified, or non-fibered. The asbestos treatment system according to claim 1, wherein the pretreatment means includes a pulverization unit,
A closed type shredder that dusts the asbestos waste into a fine powder in an inert gas atmosphere, a sensor that can detect the scattered dust concentration, and when the sensor detects a high concentration, sinks the dust by mist injection. An asbestos treatment system characterized by comprising a mist sprayer for generating dust.   The asbestos treatment system according to claim 1, wherein the pretreatment means finely pulverizes the asbestos waste material in an inert gas atmosphere and packs the mixed material afterwards. Asbestos treatment system. 2. The asbestos treatment system according to claim 1, wherein the pretreatment means crushes the asbestos waste material, the crushed asbestos waste material, water, lime or blast furnace slag, the borax and other melting point depressants. And mix
Thus, the asbestos treatment system is characterized in that the mixed material is hardened into a substantially cement-like shape and divided into sizes that are easy to process. In the asbestos treatment system according to claim 2, 3 or 4, a sensor capable of detecting the scattered dust concentration is provided adjacent to the outside in the vicinity of the pretreatment means,
The sensor is capable of detecting when fine powdery dust is generated and scattered in the vicinity from the asbestos waste material before or after the introduction to the pretreatment means. Processing system.   2. The asbestos treatment system according to claim 1, wherein the main treatment means is a melting furnace, and the mixed material of the asbestos waste material is pyrolyzed at a low temperature in a low temperature region in a temperature rising stage, and further, iron oxide in a medium and high temperature region Asbestos treatment system characterized by adding vanadium and other functional materials and discharging as slag recycling material.   7. The asbestos treatment system according to claim 6, wherein the main treatment means uses a reduction furnace as the melting furnace, and discharges the reduced slag as the slag.   7. The asbestos treatment system according to claim 6, wherein the main treatment means uses an oxidation furnace as the melting furnace, and discharges oxidized slag made of ceramic ash as the slag. .   2. The asbestos treatment system according to claim 1, wherein the treatment system is mounted on a vehicle, and can be moved to a site where the asbestos waste is disassembled and discharged, and the main treatment means comprises an electric furnace. Asbestos treatment system.   The asbestos treatment system according to claim 1, further comprising post-treatment means, wherein the post-treatment means includes a heat utilization part of the high-temperature exhaust gas generated by the main treatment means, and the exhaust gas An asbestos treatment system comprising: a cooling part; an adsorption / removal part for harmful components in the exhaust gas; and a dust collector for sucking the exhaust gas and discharging it to the outside.

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