JP3359964B2 - Waste asbestos material melting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for melting waste asbestos material for melting waste asbestos material containing asbestos such as waste building material.

[0002]

2. Description of the Related Art Asbestos is made of an extremely fine fibrous substance, has a high tensile strength, and is slightly poor in acid resistance but excellent in alkali resistance. For this reason, asbestos has been widely used in industrial products such as building materials, disc brakes and gaskets because of its high stability.

[0003] When asbestos is discarded, its accumulation property is a problem. Therefore, conventionally, such asbestos treatment, for example, treatment of waste asbestos materials including asbestos such as waste building materials, has the problem that asbestos scatters outside.
They have been treated to prevent spillage and have been buried in landfills as they are, or they have been mixed and solidified with concrete and buried in landfills.

[0004]

However, such a treatment does not make any modification to the characteristics of asbestos, which is a stable and accumulative mineral fiber, and is a temporary measure from the viewpoint of simply preventing scattering and outflow. Therefore, if the condition of the landfill changes, asbestos may be scattered outside.

[0005] That is, the former treatment of simply preventing scattering and outflow while maintaining the characteristics and shape of asbestos and disposing of the asbestos in a landfill site will cause damage to the scattering and outflow prevention treatment in the future, and the disposal will be abolished again. It is conceivable that the asbestos material is exposed, and in such a case, the asbestos may be scattered or spilled from the exposed waste asbestos material.

In the latter treatment of solidifying concrete in a landfill, the solidified concrete may be destroyed or damaged by weathering. In such a case, asbestos may be converted from waste asbestos material. May separate and spill or spill.

Therefore, in order to solve such a problem, recently, as disclosed in Japanese Patent Application Laid-Open No. 5-138147, aluminum oxide is added to waste asbestos material to adjust the components. Is fired at a temperature of 1220 ° C. or higher to produce a ceramic product.

Therefore, it is conceivable to use a product of waste asbestos material produced by the same method as a landfill. However, in this method, it is necessary to procure aluminum oxide to be added, and to add the added material.

In addition, since the amount of the product corresponding to the amount of added aluminum oxide increases, the amount of the landfilled material increases, which is not good. The present invention has been made in view of such circumstances, the purpose is to add asbestos, without adding any additives, and without leaking out of the device, does not occur scattering and outflow, It is another object of the present invention to provide a waste asbestos material melting treatment apparatus that can be processed into a harmless substance excellent in volume reduction.

[0010]

According to a first aspect of the present invention, there is provided an apparatus for melting waste asbestos material, comprising a combination of a furnace body and a furnace lid, wherein the furnace is hermetically sealed. A melting furnace is provided, and a charging shot is provided through the furnace lid along the inside and outside of the furnace, and a plastic housing in which waste asbestos material is hermetically stored at an end of the charging shot facing the outside of the furnace. An input section for guiding the bag to the charging port; a pushing device for pressing the storage bag supplied from the input section into the charging port;
A shut path is provided for guiding the storage bag pushed downward by the pushing device into the furnace while holding the storage bag pushed in by the pushing device. In the furnace.

According to the second aspect of the present invention, in addition to the above object, the apparatus for melting waste asbestos material has a simple structure, and the storage bag in which the waste asbestos material is hermetically closed is lowered in a desired manner. In order to do so,
It is constituted by a passage having a diameter determined to stop the movement of the storage bag by compression.

According to a third aspect of the present invention, in addition to the above object, in order to smoothly dissolve the waste asbestos material stored in the storage bag, an end of the short path is provided with a furnace. In this case, a cooling unit for extending the molten slag that is melted in the vicinity of the molten metal slag to the vicinity of the molten metal slag is provided at an end near the molten metal slag.

[0013] In addition to the above object, the apparatus for melting waste asbestos described in claim 4 is intended to treat extremely fine soot generated in an electric melting furnace without leaking out of the apparatus. In addition to the configuration described in 1 above, a dust collector connected to the electric melting furnace through a gas duct to collect dust and soot contained in the atmosphere in the furnace, and a soot and dust collected by the dust collector are made of plastic. In other words, a storage device for hermetically storing in a storage bag is provided.

According to a fifth aspect of the present invention, there is provided a waste asbestos material melting apparatus for treating a combustible gas generated when the waste asbestos material is melted. Has been established.

According to a sixth aspect of the present invention, there is provided a waste asbestos material melting treatment apparatus for preventing waste asbestos material remaining in the furnace from leaking out of the apparatus when the operation is stopped. Alternatively, in the melting processing apparatus according to claim 4, when the operation of the electric melting furnace is stopped, the pushing device is operated to discharge all the storage bags in the shot path into the furnace; When the operation of the furnace is stopped, a lid for closing the charging port of the charging section is provided.

The waste asbestos material melting apparatus according to a seventh aspect of the present invention is the waste asbestos material melting apparatus according to the first or fourth aspect, wherein the pushing device is operated when the operation of the electric melting furnace is stopped. Means for discharging all the storage bags in the shot path into the furnace, and means for filling the lower part of the shot path with the dummy storage bags containing the heat-resistant fibers when the operation of the electric melting furnace is stopped. And has been provided.

[0017]

According to the first aspect of the present invention, the plastic assembling bag in which the waste asbestos material is hermetically sealed is sequentially charged from the charging section. In addition, since the waste asbestos material is hermetically sealed by the storage bag, it does not scatter outside during the work up to the introduction.

The loaded storage bags are sequentially pushed into a loading shot by a pushing device. Here, since the shut path of the loading short is constituted by a passage for holding the storage bag, the storage bag does not fall naturally but descends while being held in the short path as it is pushed. .

As a result, the storage bags are in a state of being stacked in multiple stages in the short path. On the other hand, the storage bag near the outlet is
The bag itself disappears due to the heat of the electric melting furnace, and becomes a lump of only waste asbestos material.

[0020] This massive waste asbestos material is used as the input shoe.
From the melt outlet into the molten slag. Then, the waste asbestos material is dissolved in the molten slag heated to the melting point or higher in the electric melting furnace.

As a result, the waste asbestos material is melted into a substance which does not cause scattering and outflow. The material thus treated is also excellent in volume reduction because no additives are added.

In addition, during the melting process, the multiply stacked storage bags themselves serve as lids in the charging shot, so that fine dust and soot existing in the furnace does not leak out of the apparatus. As a result,
The harmful asbestos does not leak out of the apparatus at all, is not liable to be scattered or spilled out, and is treated with a substance excellent in volume reduction.

According to the second aspect of the present invention, the storage bag in which the waste asbestos material is hermetically sealed is entirely compressed in accordance with the pushing of the pushing device, and is sequentially placed on the shot path. , Be pushed.

[0024] Thus, the accommodation bag in the stout road is
The waste asbestos material is brought into contact with the wall surface due to its elasticity, and is held in the passage by friction, that is, held so as to keep the movement.

This is because a shroud having a predetermined passage diameter is used.
With the configuration using only the toe path, the storage bag in which the waste asbestos material is hermetically stored can be lowered while overlapping in the charging shot in accordance with the pushing.

According to the apparatus for melting waste asbestos material according to the third aspect, the cooling section provided at the end of the shot path close to the molten slag suppresses the temperature rise due to the molten slag, and the stored waste is stored. The asbestos material is prevented from melting and disappearing until near the outlet.

As a result, the waste asbestos material in the shot path is sunk into the molten metal slag from a position near the molten metal slag surface. As a result, it is possible to dissolve the waste asbestos material with the molten metal slag without forming a bridge.

According to the apparatus for melting waste asbestos material according to the fourth aspect, during the melting processing of the waste asbestos material according to the first aspect, extremely fine soot generated in the electric melting furnace is removed from the gas duct. Through the dust collector to be collected.

The collected dust is hermetically stored in a plastic storage bag in a storage device. By loading the storage bag containing the dust into the loading section again, the dust can be processed.

This makes it possible to carry out the melting treatment of the waste asbestos material without any harmful substances containing asbestos leaking out of the apparatus. According to the apparatus for melting waste asbestos material described in claim 5, flammable hydrocarbons and other flammable gas generated by gasification of the plastic storage bag are burned by the combustion device before reaching the dust collecting device. It becomes harmless carbon dioxide and water vapor.

As a result, not only asbestos and dust, but also combustible gas generated during the melting process is treated. According to the waste asbestos material melting apparatus according to claim 6, when the operation is stopped, the input port of the input section is closed,
By operating the pushing device, all the storage bags in the shot path are discharged into the furnace.

As a result, even if the operation is stopped, the waste asbestos material, dust and gas remaining in the furnace will not leak out of the apparatus. According to the waste asbestos material melting apparatus according to the seventh aspect, when the operation is stopped, all the bags in the shot path are discharged into the furnace by operating the pushing device.

Next, instead of the conventional storage bag containing the waste asbestos material, a dummy storage bag containing the heat-resistant fiber is filled in the lower portion of the shot path. As a result, the shut path is sealed by filling the storage bag with the dummy, so that the waste asbestos material, soot and dust remaining in the furnace even after the operation is stopped, as in the case of claim 6. Gas and the like do not leak out of the apparatus. In addition, the shut path is shielded from the heat from the molten metal slag and the high-temperature atmosphere by the heat shielding by the dummy bag, so that it is protected from heat damage.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to a first embodiment shown in FIGS. FIG. 1 shows the entirety of a waste asbestos material melting apparatus to which the present invention is applied.
Denotes an electric melting furnace, for example, an electric resistance melting furnace (hereinafter simply referred to as a melting furnace), and 2 denotes a furnace body.

As shown in FIG. 2, the furnace body 2 has a furnace wall 4 and a furnace bottom 5 in which a wall is made of a graphite-based refractory, for example, inside a steel furnace shell 3. Further, a cooling jacket 6 is provided on the outer peripheral surface of the furnace shell 3 along the circumferential direction, and is equal to or higher than the melting point temperature of the waste asbestos material A, for example, 1500.
It is designed to withstand high temperatures of ℃.

A furnace lid 7 is provided at the upper opening of the furnace body 2 so as to close the opening, thereby sealing the inside of the furnace.
The furnace lid 7 is provided with an alumina-based amorphous refractory 8 on the inner surface. Further, a cooling jacket 7 a is provided on the outer surface of the furnace lid 7 so as to withstand a high temperature of 1500 ° C. as in the case of the furnace body 2.

The furnace lid 7 is provided with an electrode made of carbon, that is, a graphite electrode 9, penetrating through the furnace lid 7. The graphite electrode 9 is gripped so as to be able to move up and down by an electrode lifting device (not shown) having an electrode gripping device.

Further, the furnace lid 7 is provided with a waste asbestos material charging device 10 (hereinafter simply referred to as a charging device 10). The object to be charged from the charging device 10 is of a required size in which a waste asbestos material A including asbestos such as waste building material is hermetically housed in a double plastic bag B of a predetermined size. Alternatively, the soot and dust generated during the treatment may be of a required size in a double plastic storage bag B of a required size.

The charging device 10 will be described.
Reference numeral 1 denotes a charging shoe provided so as to penetrate the furnace lid 7. The charging shoe 11 has a cylindrical metal upper end having one end supported by the furnace lid 7 via the refractory 12 and the other end extending upward, the upper end being a closed end, and the lower end being an open end. A cooling jacket 13 (corresponding to a cooling portion) is formed on the entire peripheral wall portion, which is connected to the side shout 11a and the lower end of the upper side shout body 11a and extends downward (inside of the furnace) from the lower end. It has a cylindrical lower side shoe 11b.

The shut path 15 is formed by using a passage 15a formed by the inner cavity of the lower part 11a and the lower part 11b arranged in series. The lower end of the shoot path 15 extends to near the molten metal slag surface due to the extension of the lower side shoot 11b. The lower end of the shut path 15 communicates with a discharge port 16 at the lower end of the lower side shut 11b which is open to the molten metal slag surface.

A charging section 17 is provided at an end of the upper side sleeve 11a facing the outside of the furnace. The charging section 17 has a charging duct 18 connected to the peripheral wall of the upper side shoe 11a as shown in FIG. The charging duct 18 protrudes along the horizontal direction, and its end is closed.

An input port 19 having a larger opening than the storage bag B for storing the waste asbestos material A and the storage bag D for storing the dust and dust C is provided in the upper wall portion at the center in the longitudinal direction of the charging duct 18. Have been. Thereby, the storage bag B storing the waste asbestos material A and the storage bag D storing the dust and dust C from the charging port 19 into the charging duct 18.
Can be inserted.

The input port 19 is provided with a rotary lid 20 for opening and closing the input port 19. The lid 20 is used so that it is always open during operation and closed during a stop such as operation stop, and closes the inlet 19 so as not to leak during the stop.

A passage 18a formed by the charging duct 18.
Is composed of an inner cavity having an inner diameter larger than the outer shape of the storage bag B storing the waste asbestos material A and the storage bag D storing the dust and dust C.

At the end of the passage 18, an input pusher 21 which can move back and forth along the passage 18a is accommodated.
The input pusher 21 is connected to a hydraulic cylinder device 23 as a drive source via, for example, an advance / retreat shaft 22 penetrating the end of the duct.

The hydraulic cylinder device 23, the upper side shoe shown by the two-dot chain line in FIG. 2 - and DOO 11a inlet position X _1, the stroke between the standby position X ₂ of the passage ends indicated by the solid line - click functions have.

By the stroke movement of the hydraulic cylinder device 23, the storage bag B or the storage bag D inserted from the input port 19 is passed through the input duct 18 to the short path 1.
5 can be pushed into the entrance.

[0048] The upper end of the upper duct 11a, pushing the pusher -24 a retractable toward the inlet position X ₁ side is accommodated. The pushing pusher 24 is connected to a hydraulic cylinder device 26 as a driving source (which constitutes a pushing device together with the hydraulic cylinder device 26) via, for example, an advance / retreat shaft 25 penetrating the end of the duct.

The hydraulic cylinder device 26 has a push-in position Y ₁ set at the same position as, for example, the lower surface of the passage 18 a shown by a two-dot chain line in FIG. 2, and a standby position Y ₂ at the end of the duct shown by a solid line.
And has a function of performing a stroke between

By the stroke movement of the hydraulic cylinder device 26, the storage bag B or the storage bag D pushed into the entrance of the upper side shoe 11a is pushed into the shot path 15.

Here, the shut path 15 is formed by a passage 15a having an inner diameter considerably smaller than the outer shape of the storage bag B storing the waste asbestos material A and the storage bag D storing the dust and dust C. Specifically, in the passage 15a, the storage bag B and the storage bag D do not naturally fall on the shut path 15 as they are, but are compressed by being pushed by the push-in pusher 24 and proceed to the shut path 15, and the pushing is performed. It has an inside diameter that stays in the closed position.

Each of the hydraulic cylinder devices 23 and 26 is connected via a cylinder drive device 27 to a control unit 28 composed of, for example, a microcomputer. Further, the control unit 28 is connected to an operation unit 28a having, for example, an ON switch and a pause switch (both are not shown).

The control unit 28 is set so that when the input switch is operated, the input pusher 21 and the push-in pusher 24 which have been waiting are sequentially moved to the entrance position X ₁ and the push-in position Y ₁ . .

With this setting, the storage bags B and D input from the input port 19 intermittently overlap each other in the shot path 15 and intermittently at every stroke of the push-in pusher 24. Descend.

The cooling jacket 1 of the charging shoe 11
Numeral 3 is connected to the cooling device 30 via the circulation paths 29a and 29b together with the cooling jackets 6 and 7a of the melting furnace 1. In addition, 31a and 31b are the circulation paths 29, respectively.
a and 29b show a circulating pump interposed.

Thus, the melting furnace 1 withstands the high temperature of 1500 ° C. by supplying the cooling fluid cooled by the cooling device 30 to the cooling jackets 6, 7a. Further, by supplying the cooling fluid cooled by the cooling device 30 to the cooling jacket 13, the waste asbestos material A and the dust C
Until it is sent as close as possible to the outlet 16
It does not melt and disappear.

When the pause switch is operated, the control unit 28 controls the standby push-pusher-21.
And the shoe as shown in FIG. 4 - set to move have been made to preparative path 15 depressed position Y ₃ for pause is set to the end side of the, when at rest, such as to stop the operation, Gerhard -All the storage bags B and D remaining in the port 15 can be put into the furnace.

On the other hand, a gas duct 32 is connected to the furnace lid 7. The end of the gas duct 32 extends out of the furnace as shown in FIG. 1, and guides exhaust gas (atmosphere) in the furnace to the outside of the furnace. This gas duct 32
Is connected to a dust collecting device 33 installed outside the furnace.

The dust collecting device 33 is configured by connecting a coarse particle dust collecting device 33a and a fine particle dust collecting device 33b in series. The outlet of the fine particle dust collector 33b is provided with a suction fan 34.
Are connected to each other, and the exhaust gas in the furnace is guided to each of the coarse particle dust collector 33a and the fine particle dust collector 33b by the suction of the suction fan 34.

That is, in each of the coarse particle dust collector 33a and the fine particle dust collector 33b, the dust C contained in the exhaust gas is discharged.
Is to be removed. Further, in the gas duct 32, a secondary combustion torch 32a is provided as a device for burning the combustible gas flowing in the gas duct 32.

Reference numeral 35 denotes a chimney connected to the discharge section of the suction fan 34. In addition, each dust collector 33a, 33
b, storage devices 36a and 36b for packing the collected dust and dust C into the storage bag D are provided.

Each of the storage devices 36a and 36b has, for example, hoppers 37a and 37b at an outlet formed below the dust collectors 33a and 33b for collecting dust and dust C. The outlets of the hoppers 37a and 37b have, for example, screw feeders 38a and 38b as unloading devices for unloading the dust C. The hopper 37a and the screw feeder 38a provided in the dust collector 33a for coarse particles are for coarse particles, and the hopper 37b and screw feeder 38b provided in the dust collector 33b for fine particles are for fine particles.

The motors 39a and 39b as drive units for driving the screw feeders 38a and 38b for the coarse particles and the fine particles, respectively, have operation units 40a and 39a for turning on and off the motors 39a and 39b, respectively. 40b is provided.

Screws for coarse particles and fine particles
At the outlets of the dies 38a and 38b, mouths 41a and 41b to which the mouth of the storage bag D can be attached are provided. Further, each of the mouths 41a and 41b has a structure in which a plate-like valve body slides between a closed position and an open / close position of the mouths 41a and 41b, for example, a switch which is opened and closed by the operation units 40a and 40b. Sealing valves 42a and 42b are provided.

As a result, the storage devices 36a and 36b
In any case, by attaching the mouth of the storage bag D to the mouths 41a and 41b and turning on the operation units 40a and 40b,
The screw feeders 38a and 38b are operated, and the sealing valve 42 is operated.
The a and b open so that the dust C (coarse and fine particles) in each of the hoppers 37a and 37b can be packed in a bag. By turning off the operation units 40a and 40b, the screw feeders 38a and 38b are stopped, and the sealing valves 42a and 42b are closed, so that the dust C does not leak to the surroundings.

The storage bag C packed with the dust C is also
By being charged into the charging port 19, the dust C is melted together with the waste asbestos material A.

Although not shown, the furnace body 2 of the melting furnace 1 is provided with a tapping slag discharge port for taking out the molten material to the outside. Next, the operation of the melt processing apparatus configured as described above will be described.

First, the melting furnace 1 is operated to generate the molten metal slag 43 in the furnace. For example, carbon powder as a high-temperature heat source and a raw material as a molten metal slag source are charged into the melting furnace 1 and energized to the graphite electrode 9.

Thus, the raw material serving as the molten metal slag source is melted, and a predetermined molten metal slag 43 is generated in the furnace. During operation in this way, around the input section 17,
A waste asbestos material A packed in a double plastic storage bag B for processing is transported from a site (a place where waste asbestos material is generated).

At this time, since the waste asbestos material A is hermetically contained in the storage bag B, the asbestos of the harmful waste asbestos material A does not scatter or flow into the outside air during transportation.

Next, the processing operation for the waste asbestos material A is started. At this time, as shown in FIG. 3A, the lid 20 is opened, the storage bags B are inserted one by one, and the input switch of the operation unit 28 is operated for each input operation.

[0072] Then, first, the working oil pressure cylinder device 23, turned pusher -21 located at the standby position X ₂ as shown in FIG. 3 (b) is straw to the entrance point X ₁ - and click, is turned The storage bag B containing the waste asbestos material A is pushed into the inlet of the upper side seat 11a through the charging duct 18.

Next, the hydraulic cylinder device 26 operates,
Stroke-on pusher -21 from state located at the inlet position X _1, as shown in FIG. 3 (c), until the push pusher -24 is depressed position Y ₁ located on the standby position Y ₂ - click, and the inlet The storage bag B pushed into the section is pushed into the shot path 15 while being compressed.

Here, the passage 15a of the short path 15 is
Since the inner diameter of the containing bag B containing the waste asbestos material A that has been pushed is set so as to stay at that position, the bag stops at the point pushed by the pushing pusher 24.

When the pushing is completed, the pushing pusher 24 and the input pusher 21 are returned to the original standby position X.
_2, return to the Y _2. Such a charging step is repeatedly performed as the storage bags B are charged one by one.

Then, the storage bag B containing the waste asbestos material A compressed as shown in FIG.
Are filled so as to be stacked in multiple stages. As a result, the storage bag B in the short path 15 is pushed into the pusher-2.
4 is intermittently lowered every time the operation 4 is operated, and the lowermost storage bag B gradually approaches the discharge port 16.

Then, the lower plastic storage bag B reaches the high-temperature point of the charging port 11, and the plastic bag itself is softened by the heat of the molten metal slag 43. After melting, it is gasified (decomposed) and disappears.

As a result, only the waste asbestos material A packed in a lump at the lower level is obtained. Here, the cooling jacket 13
The cooled cooling fluid is circulated through the
1 is cooled on the side of the discharge port 16, the lump of waste asbestos material A is not melted and disappears due to the suppression of the temperature rise due to the molten metal slag 43, and the point (lower side shot) 14 lower end).

Next, this massive waste asbestos material A is
In accordance with the lowering by the pushing of the pushing pusher 24, it is extruded into the furnace from the outlet 16 located at a position close to the molten metal slag surface.

By such indentation, waste asbestos material A
Is smoothly pushed into the molten metal slag 43 without forming a bridge. Then, most of the lump waste asbestos material A sinks in the molten metal slag 43 heated to the melting point temperature of the waste asbestos material A or higher.

Here, since the waste asbestos material A sunk has good wettability with the molten metal slag 43, heat exchange is rapidly performed with the molten metal slag 43 and the molten asbestos material A is rapidly melted.
Further, a part of the waste asbestos material A is dispersed on the molten slag surface around the outlet 16. This waste asbestos material A
Is melted from the portion in contact with the molten metal slag 43 while covering the molten metal slag surface over the entire surface of the furnace in accordance with the flow of the molten metal outward from the periphery of the electrode.

Thus, the waste asbestos material A is efficiently dissolved. At the same time, the layer of waste asbestos material A that covers the molten metal slag surface by diffusion blocks the radiant heat from the molten metal slag surface and protects the refractory of the furnace body 2 and the furnace lid 7. Further, the layer of the waste asbestos material A has a function of collecting most of heavy metal oxides and the like volatilized from the molten metal slag surface and returning it to the molten metal slag.

Thus, the waste asbestos material A is melt-processed into a harmless substance that does not scatter or flow. Further, the material thus melt-processed is excellent in volume reduction since no additives are added.

Further, during the melting process, the charging bag 11 containing the waste asbestos material A, which overlaps in multiple stages, forms a lid and seals, so that the fine dust existing in the furnace is removed. It does not leak outside.

That is, by such a melting treatment in the melting furnace 1, harmful asbestos is reduced in volume without adding any additives, leaking to the outside air, and without fear of scattering and outflow. Processed into excellent harmless substances.

Then, the substance may be taken out of the furnace and finally landfilled as a landfill material or reused. On the other hand, in the furnace, gas (combustible hydrocarbons and other combustible gases generated due to the disappearance of the plastic bag) and extremely fine soot C are generated due to the melting treatment of the waste asbestos A.

Here, since the dust C contains a small amount of asbestos, the treatment must be considered. Therefore, the dust C is processed using a dust collection system and a storage system.

That is, the suction fan 34 operates according to the operation of the melting furnace 1. As a result, the gas and the dust C generated in the furnace are sucked from the gas duct 32. While passing through the gas duct 32, the operating secondary combustion torch 32a combusts combustible gas such as combustible hydrocarbons generated due to gasification of the bag.

By this processing, the flammable gas is removed as harmless carbon dioxide gas and water vapor before the dust collectors 33a and 33b. The remaining dust C is the gas duct 32
Through the dust collector 33a for coarse particles.

Then, when the dust collector 33a passes, the coarse particles D are collected by the coarse particle dust collector 33a. Further, the dust C of the fine particles passing through the coarse particle dust collector 33a is led to the subsequent fine particle dust collector 33a,
When passing through the dust collector 33b, particulate dust C is collected by the particulate dust collector 33a.

The dust C collected by the dust collectors 33a and 33b accumulates in hoppers 37a and 37b provided below the dust collectors 33a and 33b, respectively. Then
The dust C in each of these hoppers 37a and 37b is hermetically bagged by an operator.

That is, on the coarse particle side, the mouth of the double plastic storage bag D is inserted into the screw feeder 38.
The user attaches the operation part 40a to the mouth body 41a of FIG. Then, the sealing valve 42a opens to open the mouth 41a. Further, the screw feeder 38a starts the transport operation.

As a result, the dust C of coarse particles accumulated in the hopper 37a is stored in the storage bag D. Then, if a predetermined amount of dust and dust C is stored,
The operation unit 40b is turned off.

Then, the sealing valve 42b is closed, and the mouth 4 is closed.
1b is closed and sealed, and the screw feeder 38b stops the transport operation, and shuts off the dust collection system and the storage system from the outside air.

This prevents the dust C from scattering into the environment. After the dust C of the coarse particles is stored in the storage bag D, the mouth of the storage bag D is closed hermetically, and the dust C is stored in a sealed state.

On the side of the fine particles, the dust C of the fine particles is stored in the double plastic storage bag D in a closed state by the same operation. Each of the soot and dust C of the bagged coarse particles and fine particles is charged together with the bagged waste asbestos material A from the above-mentioned inlet 19, and is melted and rendered harmless as in the case of the waste asbestos material A.

The amount of dust and soot C is determined in accordance with the ratio determined from the amount of melting process in the melting furnace 1 to maintain good operation. That is, it can be understood from experiments and the like that the amount of generated dust C is the percentage of the waste asbestos material A to be melt-processed by combining coarse particles and fine particles. The bulk specific gravity of the dust C is almost the same as that of the waste asbestos material A.

From this, the processing amount of dust C can be known.
In other words, it is possible to know how much the bag containing dust and dust C should be put in with respect to the number of bags containing waste asbestos material A to be melt-processed (the input amount of waste asbestos material A, the amount of collected dust and so on). Ratio that almost matches the ratio).

For example, the number of bags containing waste asbestos material A,
It suffices that 200 bags are filled with the coarse particles and the fine particles D in the bag 19 at a rate of 1 bag.
As a result, the dust C softens, melts and vaporizes while descending along the short path 15, and is sandwiched in the waste asbestos material. A part of the dust C is absorbed or trapped in the waste asbestos material A and melts. Pushed into the slag,
Dissolves without dusting. In addition, dust and dust C which is to be discharged as a fine powder without being adsorbed or trapped in the waste asbestos material A is also used as the waste asbestos material A covering the surface of the molten metal slag.
Gradually dissolves in the state of being confined in the layer.

Thus, the waste asbestos A can be melted without any harmful substances containing asbestos leaking out of the processing apparatus. Needless to say, a plastic sheet for scattering prevention used at the place where the waste asbestos material A is removed (it is wrapped around the site to prevent scattering of asbestos, and asbestos is also attached to this).
May be stored in the storage bag B and subjected to the melting process. in this case,
The size of the plastic sheet may be adjusted, for example, by appropriately folding it, and the plastic sheet may be put into the bag together with the waste asbestos material A.

On the other hand, when the operation of the melting furnace 1 is stopped for periodic inspection or repair, it is not preferable that undissolved waste asbestos material A remains in the furnace. Therefore, at this time, after the charging of the storage bags B and D is stopped and the inside of the charging duct 18 is emptied, the charging port 19 is closed with the lid 20 as shown by the two-dot chain line in FIG. 2 and the solid line in FIG. Then, the pause switch of the operation unit 28 is operated.

[0102] Then, by the operation of the hydraulic cylinder device 26, pushing the pusher -24 as shown in FIG. 4 stroke to a position of the depressed position Y ₃ - and click, shoe - DOO passage 15 all filled in the Waste asbestos material A is molten slag 43
It is thrown into.

As a result, all remaining waste asbestos material A
Is melt processed. At this time, since the inside of the furnace is kept airtight by the lid 20, the waste asbestos material A, the dust C, and the gas remaining in the furnace do not leak to the outside.

As a result, the operation is stopped without the waste asbestos material A, the dust C, and the gas being scattered or flowing out to the external environment. FIG. 5 shows a second embodiment of the present invention.

In the present embodiment, not only the above-mentioned leakage at the time of the stoppage of the operation, but also the molten metal slag surface is exposed (produced by the gradual melting of the waste asbestos material A floating on the surface of the molten metal slag 43). -Means for suppressing the heat damage of the gate 11.

That is, in the present embodiment, a dummy bag is filled in place of the waste asbestos material A filled in the shot path 15. Specifically, in a storage bag E made of heat-resistant fiber, for example, ceramic fiber in advance,
Similarly, a dummy bag is prepared in place of the storage bag B or the storage bag D containing the waste asbestos material A of the first embodiment, which is also filled with the heat resistant fiber F.

A second switch (not shown) is set on the operation unit 28a. When this second switch is operated, the controller 28 controls the closing pusher-2.
Following the operation 1, the pusher is pushed from the standby position Y ₁ to the dummy set position Y ₄ set at the lower part of the shot path 15.
The function to move 24 is set.

[0108] Thus, at the time of shutdown, similar to the case of the first embodiment, stroke and push pusher -24 depressed position Y ₃ - by click (shown in Figure 4), shoe - remaining preparative path 15 All the containing bags C and D containing the waste asbestos material A and the soot and dust C are put into the molten metal slag.

Then, as shown in FIG. 5, the storage bag E (dummy bag) containing the heat-resistant fiber F is immediately inserted into the charging port 19.
And the second switch is operated. Then, the entered bag E (dummy - bags), the motion of the input pusher -21 described above, dummy of push pusher -24 - stroke to the set position Y ₄ - by click motion, as shown in FIG. 5 It is pushed down to the lower part of the short path 15.

Then, the storage bag E containing the heat-resistant fiber is filled in the lower part of the charging shoe 11. As a result, the lower portion of the charging shoe 11 is simultaneously sealed and thermally shielded by the storage bag E containing heat-resistant fibers.

Thus, the residual waste asbestos material A
In addition, damage to the charging shoe 11 during the melting of the material can be prevented. When starting operation again, the filling is heat-resistant fiber,
If the accommodating bag E is melted as it is together with the accommodating bag B containing the waste asbestos A to be charged later, the melting process of the waste asbestos material A is performed as it is, and does not affect the melting process.

Of course, instead of one bag, a plurality of dummy bags may be filled in the lower portion of the shot path 15. In this case, the effect is further increased. However, in the second embodiment, FIG. 2 is diverted and the same reference numerals are given to the same parts as those in the first embodiment and the description of the same parts, and the description is omitted.

The structure of the heat shield described in the second embodiment may be combined with the structure of hermeticity by the lid 20 described in the first embodiment. In this case, after the shot path 15 is thermally shielded by the dummy bag, the charging port 19 is closed by the lid 20.

Further, the present invention may be used for a melting furnace having a plurality of electrodes, or another type of electric melting furnace may be used. Further, a plurality of charging-short structures may be provided in the melting furnace instead of a pair of charging-short structures to efficiently melt a large amount of waste asbestos material A. For example, in a melting furnace having three electrodes, it is conceivable to provide a total of three charging shoot structures, one set between each electrode.

[0115]

As described above, according to the first aspect of the present invention, asbestos can be reduced in volume without adding any additives, without leaking out of the apparatus, without scattering and outflow. Can be processed into excellent harmless substances.

According to the second aspect of the present invention, in addition to the effect of the first aspect, with a simple structure, the inside of the charging shoe is
The storage bag in which the waste asbestos material is hermetically stored can be lowered as expected.

According to the third aspect of the invention, in addition to the effect of the second aspect, the waste asbestos material can be dissolved in the molten metal slag without forming a bridge, and the waste asbestos material can be smoothly removed. Can be dissolved.

According to the fourth aspect of the present invention, in addition to the effect of the first aspect, extremely fine soot generated in the electric melting furnace can be treated without leaking out of the apparatus. In addition, the waste asbestos material can be melted without leaking a substance containing harmful asbestos out of the apparatus.

According to the fifth aspect of the invention, in addition to the effect of the fourth aspect, the combustible gas generated during the melting process can be processed into harmless carbon dioxide gas and water vapor.
According to the invention of claim 6, in addition to the effect of claim 1 or claim 4, it is possible to prevent the waste asbestos material remaining in the furnace from leaking out of the apparatus when the operation is stopped.

According to the seventh aspect of the present invention, in addition to the effects of the first or fourth aspect, when the operation is stopped, the waste asbestos material remaining in the furnace is prevented from leaking out of the apparatus. In addition, the shout path can be protected from the heat from the molten metal slag and the high-temperature atmosphere by heat shielding by the dummy bag.

[Brief description of the drawings]

FIG. 1 is a view showing a waste asbestos material melting apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing an electric melting furnace constituting the melting processing apparatus.

FIG. 3 is a cross-sectional view for explaining a process in which a waste asbestos material is compression-filled into a shot path and charged into a furnace.

FIG. 4 is a cross-sectional view for explaining a process in which all waste asbestos materials filled in a shot path are put into a furnace when operation is stopped.

FIG. 5 is a sectional view showing a main part of a second embodiment of the present invention.

[Explanation of symbols]

1. Electric melting furnace 2. Furnace body
7 Furnace lid 9 Electrode 11 Loading shot 13 Cooling jacket (cooling section)
15: Shut path 16: Discharge port 17: Input section
19 ... Inlet 21 ... Injection pusher 23,26 ... Hydraulic cylinder device 24 ... Push-in pusher 32 ... Gas duct 3
2a: combustion torch 33a: dust collector for coarse particles 33b: dust collector for fine particles 34: suction fans 36a, 36b: storage devices 37a, 37b: hoppers 38a, 38b: screw feeders 41a, 41b: mouth 42a, 42b: Sealing valve A: Waste asbestos C: Soot and dust
E: heat-resistant fiber bag B, D: plastic bag F: heat-resistant fiber

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B09B 3/00-5/00 F23G 5/24 F23G 7/00

Claims (7)

(57) [Claims] 1. An electric melting furnace comprising a combination of a furnace body and a furnace lid, wherein the inside of the furnace is hermetically sealed, and a charging shot provided through the furnace lid along the inside and outside of the furnace. An input section provided at an end of the charging section facing the outside of the furnace, for guiding a plastic storage bag in which waste asbestos material is hermetically stored to the charging section; Put the storage bag in the
A push-in device for pushing the storage bag into the loading shoe, and a passage for holding the storage bag in the loading shot, and holding the storage bag pushed in by the pushing device. And a discharge port provided at an end of the charging stove facing the inside of the furnace and discharging the storage bag from the lower end of the shout path into the furnace. Characteristic melting equipment for waste asbestos material. 2. The apparatus for melting waste asbestos material according to claim 1, wherein said shut path is constituted by a passage having a diameter determined to stop the movement of said storage bag by compression. . 3. The shout path extends to near the surface of the molten slag melted in the furnace, and a cooling portion for cooling the molten slag is provided at an end portion near the molten slag. The apparatus for melting waste asbestos material according to claim 2, wherein: 4. An electric melting furnace comprising a combination of a furnace body and a furnace lid and hermetically sealing the inside of the furnace, a charging shot provided through the furnace lid along the inside and outside of the furnace, An input section provided at an end of the input shot facing the outside of the furnace, for guiding a plastic storage bag in which waste asbestos material is hermetically stored to the input shot; and the input section input from the input section. Put the storage bag in the
And a passage formed in the charging shoe and holding the storage bag in the charging shoe, and holding the storage bag pressed by the pressing device downward. A discharge path for discharging the storage bag from the lower end of the shot path into the furnace; and a gas duct to the electric melting furnace. A dust collecting device for collecting dust and soot contained in the atmosphere in the furnace, and a storage device provided in the dust collecting device and hermetically storing the collected dust in a plastic storage bag. An apparatus for melting waste asbestos material, comprising: 5. The apparatus for melting waste asbestos material according to claim 4, wherein a combustion device for burning combustible gas is provided in the gas duct. 6. The apparatus for melting waste asbestos material according to claim 1 or 4, wherein when the operation of the electric melting furnace is stopped, the pushing device is operated to entirely accommodate the asbestos material. Means for discharging the bag into the furnace, provided in the charging section, when the operation of the electric melting furnace is stopped,
A waste asbestos material melting processing apparatus, comprising: a lid for closing an input port of the input section. 7. The apparatus for melting waste asbestos material according to claim 1 or 4, wherein when the operation of the electric melting furnace is stopped, the pushing device is operated to entirely accommodate the asbestos material. Means for discharging the bags into the furnace, and means for filling the lower part of the shot path with a storage bag of a dummy containing heat-resistant fibers when the operation of the electric melting furnace is stopped. Waste asbestos material melting equipment.