JPH06174895A - Melting facility for processing radioactive metal waste - Google Patents

Abstract

PURPOSE:To reduce the waiting time of an electroslag melting device so as to enhance the capacity of the device by providing cross rails which can be connected to rails on a turn table, and providing at least two stool traveling tracks on the cross rails. CONSTITUTION:A turn table 4 is turned and rails 9B-9C are connected to rails 9B-9A and a stool traveling track 3A in a waiting position 6 is put in an electroslag melting device 2. A predetermined amount of molten slag is formed and radioactive metal wastes are melted and solidified. A lump of metal is conveyed to a track 33 in a lump takeout position 5 and cleaning, etc., is carried out and then the table 4 is turned and the rails 9B-9C are connected together and the track 3B is moved to the position 6. After the melting process the track 3A is moved to the position 5 along the rails 9A-9B with the slag put thereon. After the track 3A is moved, the waiting track 33 is put in the device 2 and the melting process is repeated. Thus the tracks 3A, 3B are alternately taken in and out of the device 2 for the melting process, so as to reduce the waiting time of the device 2 to enhance the efficiency of the melting process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facility for melting and processing radioactive metal waste generated in nuclear facilities, scrap of contaminated facilities, and the like, and particularly the processing capacity when an electroslag melting device is used as a melting device. It is about improvement for improvement.

[0002]

2. Description of the Related Art The present applicant has conducted research on melting treatment of radioactive metal waste generated in nuclear facilities and scrap of polluted facilities using an electroslag melting apparatus, and applied for an invention developed by this research. (See Japanese Patent Publication No. 63-57147 and Japanese Patent Publication No. 17790).

The basic construction of a conventional melting treatment facility for radioactive metal waste using an electroslag melting apparatus is shown in FIG.
As shown in FIG. 3, a melting treatment position 1 equipped with an electroslag melting device 2 and a water cooling platen 7 of the electroslag melting device 2 are placed to mount the electroslag melting device 2 and an ingot of radioactive metal waste after the melting treatment. It is composed of a surface plate carrier 3 that travels back and forth between the take-out position 5.

Also, the electroslag melting apparatus 2 is used.
Is a melting furnace body 11 including a water-cooled mold 10 and a water-cooled surface plate 7,
It basically comprises a waste supply system 13 for supplying metal waste into the melting furnace body, and an electrode rod 12 for supplying energy for melting and processing the metal waste.

The melting treatment of the radioactive metal waste by the melting treatment facility for the radioactive metal waste having the above-mentioned structure is performed as follows. That is, first, the surface plate carrier 3 is moved from the ingot take-out position 5 to just below the electroslag melting apparatus 2, and the water cooling surface plate 7 on the surface plate carrier 3 is used as the water cooling mold 10 of the electroslag melting apparatus 2. Set and melt furnace body 11
Make up. In the process of assembling the mold, a required amount of slag-forming flux or residual slag used during the pre-melting is charged into the mold. Next, the electrode rod 12 is moved down to perform electroslag melting to form a predetermined amount of molten slag. When a predetermined amount of molten slag is formed, a radioactive metal waste is repeatedly supplied into the melting furnace main body 11 by a predetermined amount from the waste supply system 13. As a result, the radioactive metal waste is melted by the sensible heat retained by the molten slag, and the molten metal settles in the molten slag to form a molten metal pool in the lower part of the furnace, but like ordinary electroslag melting, it is cooled by water. It is solidified by being cooled by the mold 10 and the water cooling platen 7.

After the solidification, the water-cooled mold 10 and the water-cooled surface plate 7 of the electroslag melting apparatus 2 are separated, and the slag mass, the metal ingot, and the surface plate carrier 3 carrying the water-cooled surface plate 7 are moved to the ingot extraction position 5. Moving. At this position, the work of removing the slag skin adhering to the metal ingot, carrying out the slag lump and the metal ingot, and further cleaning the water-cooled surface plate 7 and the surface plate carrier 3 is carried out. Then, the next melting process is repeated.

[0007]

In the melting treatment of radioactive metal waste by the above-mentioned melting treatment facility for radioactive metal waste, one of the platen carrier trucks 3 is set to the melting treatment position 1 provided with the electroslag melting device 2. Since melting processing is performed by traveling back and forth between the ingot take-out position 5, the molten ingot is moved to the ingot take-out position 5 to remove the slag skin adhering to the metal ingot, and carry out the slag nodule and the metal ingot. Further, the water cooling platen 7 cannot be set in the electroslag melting apparatus 2 while the work such as cleaning of the water cooling platen 7 and the platen carrier 3 is being performed. For this reason, the melting process has a long waiting time, which limits the amount of radioactive metal waste to be processed, and at the same time, the operating rate of the equipment is low.

The present invention has been made in view of the above circumstances, and an object thereof is to reduce the waiting time of the electroslag melting apparatus and improve the treatment capacity of the radioactive metal waste. It is to provide melt processing equipment.

[0009]

In order to achieve the above object, one of the melting treatment equipments for radioactive metal waste according to the present invention is a surface plate carrier truck equipped with a water cooling surface plate in an electroslag melting device. In the melting treatment equipment that melts and solidifies radioactive metal waste by putting in and out, a rotary table with a rail laid on the upper surface is arranged in the middle of the traveling rail of the surface plate carrier, and the rail laid on this rotary table A traveling rail that intersects with the connectable traveling rails is laid, and at least two surface plate carrier vehicles are provided on these traveling rails.

In the above equipment, the traveling rails may be laid so as to be in an annular state by the rails laid on the rotary table, except for the traveling rails on the electroslag melting device side.

The other is a melting treatment facility for melting and solidifying radioactive metal waste by loading and unloading a platen carrier carrying a water-cooled platen into an electroslag melting apparatus. Is laid in an annular shape including under the electroslag melting device, and at least two surface plate transport carriages are provided on the rails.

[0012]

In the present invention, since the melting treatment of radioactive metal waste can be performed while sequentially moving the two or more platen carrier carts to the ingot take-out position, the standby position and the electroslag melting treatment position, The waiting time of the slag melting device is shortened, and the melting processing efficiency of radioactive metal waste can be improved.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the same components as those of the above-described conventional technique are designated by the same reference numerals and the description of the components will be omitted.

(Embodiment 1) FIG. 1 is a schematic view of a melting treatment facility for radioactive metal waste according to the present invention, in which 1 is a melting treatment position provided with an electroslag melting apparatus 2 and 3 is a fixed position. A board carrier 4 is a rotary table, 5 is an ingot take-out position equipped with a device (not shown) for taking out ingots, and 6 is a standby position where the platen carrier 3 having completed cleaning and the like stands by. Shown respectively.

At the melting treatment position 1, in addition to the electroslag melting device 2, a connector 8 for supplying / draining water to / from a water-cooled platen 7 mounted on a platen carrier 3 is mounted via a flexible pipe. There is.

The turntable 4 is rotatably provided approximately in the middle of a rail 9A laid between the melt processing position 1 and the ingot take-out position 5, and has a rail 9B connectable to the rail 9A on its upper surface. Has been laid.

The standby position 6 is arranged on a rail 9C laid at a position where the rotary table 4 is rotated by approximately 90 degrees.

The melting treatment of the radioactive metal waste by the melting treatment facility for the radioactive metal waste having the above-mentioned configuration is performed as follows. First, the rotary table 4 is rotated to connect the rails 9B and 9C to move the first surface plate carrier 3A waiting at the standby position 6 onto the rotary table 4. Next, the rotary table 4 is rotated to connect the rails 9B and 9A to move the platen carrier 3A to directly below the electroslag melting device 2, and the water-cooled platen 7 on the platen carrier 3A is attached to the electroslag melting device 2. It is set in the water-cooled mold 10 to configure the melting furnace body 11. In the process of assembling the mold, a required amount of slag-forming flux or the like is charged into the mold, and at the same time, the connector 8 for supplying / draining water to / from the surface plate carrier 3A is mounted. Then, the electrode rod 12 is lowered and electroslag melting is performed in the same manner as in the prior art to form a predetermined amount of molten slag. When a predetermined amount of molten slag is formed, a radioactive metal waste is repeatedly supplied into the melting furnace main body 11 by a predetermined amount from the waste supply system 13. As a result, the radioactive metal waste is melted by the sensible heat held by the molten slag, and the molten metal settles in the molten slag to form a molten metal pool in the lower part of the furnace and is cooled by the water-cooled mold 10 and the water-cooled surface plate 7. To solidify.

While performing the above electroslag melting treatment, the electroslag melting treatment is first performed, and the slag skin attached to the metal ingot is attached to the second platen carrier 3B which has moved to the ingot removal position 5. , Removal of slag lumps and metal ingots, and cleaning of the water-cooled surface plate 7 and surface plate carrier 3B. And after cleaning, turntable 4
The rail 9B and the rail 9C are connected to each other by moving the rotary table 4 to the upper position and moving to the standby position 6 to prepare for the next melting process.

On the other hand, in the platen carrier 3A that has been subjected to the electroslag melting treatment, the connector 8 is removed, and the water-cooled mold 10 and the water-cooled platen 7 of the electroslag melting device 2 are separated to form a slag mass, a metal ingot, and With the water-cooled surface plate 7 placed, the rail 9A and the rail 9B are moved to the ingot removal position 5. After the movement of the surface plate carrier 3A, the second surface plate carrier 3B which has been waiting at the standby position 6 is set in the same manner as the first surface plate carrier 3A is set in the electroslag melting apparatus 2. . After that, the next melting process, cleaning and the like are repeated in the above manner.

As described above, since the two platen carriers 3A and 3B are alternately put into and taken out of the electroslag melting device 2 to carry out the melting process, the waiting time of the electroslag melting device 2 is shortened and the radioactive metal waste is removed. Melt processing efficiency can be improved.

In the figure, reference numeral 3C is a spare platen carrier truck, which is used by replacing it when either of the platen carrier trucks 3A, 3B becomes unusable.

The rail 9A on the ingot take-out position 5 side and the rail 9C on the standby position 6 in the above embodiment are shown in FIG.
It may be laid in an annular shape as indicated by a one-dot chain line in FIG. 1, and in this case, the surface plate carrier 3 after cleaning or the like should be moved from the ingot take-out position 5 to the standby position 6 without passing through the rotary table 4. In addition, two or more surface plate carrier vehicles 3 can be provided and sequentially rotated for use. Even with such a configuration, the same operational effect as that of the above-described embodiment can be obtained.

(Embodiment 2) FIG. 2 is a schematic diagram of a facility for melting radioactive metal waste according to the present invention, and the same components as those in the first embodiment are designated by the same reference numerals.

What is shown in this figure is a surface plate carrier 3 (3A,
3B, -----) lays a rail 9D traveling in a ring shape, and on this rail 9D, a melting treatment position 1 equipped with an electroslag melting device 2, an ingot take-out position 5 and a standby position 6 are arranged. , The surface plate carrier 3 in one direction at each position 1,
5 and 6, the melting treatment of the radioactive metal waste is performed by performing the same predetermined treatments as described in the first embodiment at the respective positions 1, 5 and 6, and the radioactive metal waste is treated. Also in the melting treatment equipment of No. 3, similarly to the above-mentioned Embodiment 1, at the ingot take-out position 5, the slag skin adhering to the metal ingot is removed, the slag nodule and the metal ingot are carried out, and the water cooling platen 7
While the cleaning of the platen carrier 3 and the platen carrier 3 is performed, the cleaned platen carrier 3 can be mounted on the electroslag melting apparatus 2 to perform the next melting process. The waiting time is reduced, and the melting processing efficiency of radioactive metal waste can be improved.

[0026]

As described above, according to the melting treatment facility for radioactive metal waste according to the present invention, the waiting time of the electroslag melting apparatus can be shortened, and therefore the treatment capacity for radioactive metal waste can be improved. Can be improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a melting treatment facility for radioactive metal waste according to the present invention.

FIG. 2 is a schematic diagram of a melting treatment facility for radioactive metal waste according to another embodiment of the present invention.

3A and 3B are schematic diagrams of a conventional melting treatment facility for radioactive metal waste, in which FIG. 3A is a front view and FIG. 3B is a top view.

[Explanation of symbols]

1: Melt processing position 2: Electroslag melting device 3, 3A, 3B, ---: Surface plate carrier 4: Rotary table 5: Ingot removal position 6: Standby position 7: Water cooling surface plate 8: Connector 9A, 9B , 9C, 9D: Running rail 10: Water-cooled mold 11: Melting furnace body 12: Electrode rod

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Ikuo Nakai Inventor Ikuo Nakai 1-3-18 Wakihama-cho, Chuo-ku, Kobe-shi, Hyogo Kobe Steel Works, Kobe Head Office (72) Toshiyuki Nakasaku Chuo-ku, Kobe-shi, Hyogo 1-3-18 Wakihamacho Kobe Steel Works, Ltd. Kobe Head Office

Claims (3)

[Claims] 1. A melting treatment facility for melting and solidifying radioactive metal waste by loading and unloading a surface plate carrier carrying an electroslag melting apparatus with a water-cooled platen, and a rail on the upper surface in the middle of the traveling rail of the platen carrier. And a traveling rail in a direction intersecting with the traveling rail connectable to the rail laid on the rotating table, and at least two surface plate transports on these traveling rails. A facility for melting and processing radioactive metal waste, characterized by being provided with a trolley. 2. The melting of radioactive metal waste according to claim 1, wherein the traveling rails are laid so as to be in an annular state by rails laid on a rotating table, except for the traveling rails on the electroslag melting device side. Processing equipment. 3. In a melting treatment facility for melting and solidifying radioactive metal waste by loading and unloading a platen carrier carrying a water-cooled platen into the electroslag melting device, the traveling rail of the platen carrier is an electroslag melting device. A melting treatment facility for radioactive metal waste, which is laid out in a ring shape including the lower part, and at least two surface plate carrier trucks are provided on the rails.