JPH0634101B2 - Microwave sintering compression molding solidification device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a microwave sintering compression molding and solidifying apparatus, and more particularly, to sinter and solidify powdery or granular dielectric waste, or a sintering press. The present invention relates to a microwave sintering compression molding and solidifying apparatus suitable for molding.

[Conventional technology]

In recent years, a large number of nuclear power plants have been operated, and the treatment of powdery or granular dielectric waste such as incineration ash generated from the nuclear power plants has become a serious problem. That is, the waste generated from the nuclear power plant contains radioactive substances and cannot be treated in the same manner as ordinary waste. Therefore, powdery or granular dielectric waste generated in a nuclear power plant is sealed in a drum tube or the like and stored for a long period of time to reduce the radiation intensity.
When these radioactive wastes are stored for a long period of time, they are easily scattered in a powdery or granular state and are difficult to handle. Therefore, they are solidified with concrete or melted and then cooled to solidify. As a method of melting and solidifying the powdery or granular dielectric waste, a microwave melting device has been widely used in recent years because the waste can be melted without being scattered. The microwave melting apparatus has a structure as shown in FIG. 2 as shown in Japanese Patent Publication No. 56-33626 and Japanese Patent Publication No. 56-54548.

That is, in the microwave melting device 20, one end of the waveguide 22 is connected to the resonator 21, and a microwave oscillator (not shown) is provided at the other end of the waveguide 22. 23 can be introduced into the resonator 21. A heating container 24 is connected to the lower portion of the resonator 21, and the material 30 to be melted is put into the heating container 24. The melted matter 30 is guided to the resonator 21 via the waveguide 22, absorbs the energy of the microwave 23 in a resonance state, and melts. And, the above-mentioned special public relations Sho 5
In the device disclosed in Japanese Patent Laid-Open No. 6-33626, a metal plate is provided on the upper part of the resonator 21 so as to be movable up and down, and a strong electric field causes the melted material 3 to be melted.
0 is intensively added to improve the efficiency of heating and melting.

On the other hand, as a method that does not use microwave melting, sintering is used, which is a method in which heat is applied from the outside to apply pressure to sinter and solidify. This is used for products that are press molded in a mold by the sintering method.

[Problems to be solved by the invention]

However, the melting and solidifying apparatus having a microwave has a drawback that it is difficult to melt and solidify the sample in which carbon, metal pieces, or the like are mixed, because discharge occurs. Further, in the conventional microwave melting apparatus, since the material to be melted is sequentially supplied from above, scattering occurs, and there is a problem particularly when the material contains a radioactive substance.

In addition, the method of heating from outside (heating the mold) to sinter press-mold the material and solidify it into a certain mold is because the temperature of the entire mold is raised up to the sintering temperature each time molding is performed. It has a drawback that the mold is significantly deteriorated by the pressure. Also,
Since it is necessary to heat from the outside every time the sintering is performed, the mold for storing the sample must be heated in addition to the sample, so that the thermal efficiency is poor. Furthermore, in this sinter-solidification device using the external heating method, the sinter-press molding is performed in the mold, and since it is heated from the outside, the upper limit of the sample heating temperature is limited by the material of the mold. It has the drawback that it will be done. Further, since it is an external heating method, it has a drawback that it is difficult to uniformly heat a powdery material having poor heat conduction.

[Object of the Invention]

An object of the present invention is to allow a material containing a dielectric substance to be sintered and solidified, and prevent deterioration of a mold for sintering and molding,
It is an object of the present invention to provide a microwave sintering compression molding and solidifying device capable of sintering and solidifying an object to be sintered with low power.

[Means for solving problems]

When treating waste, if there is a lot of carbon in the waste,
When microwaves are applied with high power, a discharge phenomenon occurs and melting becomes difficult. Therefore, the present invention adds a glass material to waste, and melts this glass material at low power to solidify carbon with glass, thereby enabling sinter solidification of waste containing carbon, which was not possible conventionally. I chose Further, there is one in which the object to be molded is heated to sinter and press-molded in the mold, and the present invention eliminates heating the entire mold by performing microwave heating instead of external heating. ing.

That is, the present invention relates to a microwave tuning type heating apparatus for introducing a microwave into a microwave heating furnace body to heat and sinter the object to be sintered, wherein the object to be sintered is provided in a central portion of the microwave heating furnace body. Is provided with a piston for pressurizing, and a heat-resistant heat-insulating dielectric body, which is provided around the piston in a cylindrical shape and is configured to slide closely, is provided in the lower portion of the microwave heating furnace main body. It is characterized in that a material to be sintered is put into a tubular heat-resistant adiabatic dielectric body, and microwaves are applied under pressure of the piston to heat-sinter.

〔Example〕

 Examples of the present invention will be described below.

FIG. 1 shows an embodiment of the present invention.

In the figure, a frame 14 is formed on the base 13,
This constitutes the press body 2. A hydraulic cylinder 1 is provided at the center of the upper part of the press body 2.

The microwave heating furnace body 4 is placed on the base 13. The lower part of the microwave heating furnace body 4 is sealed by a bottom plate 12. A pillar 5 is fitted in the center of the microwave heating furnace main body 4, and the pillar 5 is configured to move up and down by the hydraulic cylinder 1. Further, the microwave heating furnace body 4 is provided with a microwave supply port 8, a discharge detector 6 for detecting whether or not a discharge phenomenon occurs inside, and an exhaust port 7. Further, in the lower part of the microwave heating furnace main body 4, there is provided a heat-resistant heat insulating dielectric 9 composed of, for example, boron nitrite or the like in which the pillars 5 are closely fitted.

Further, a heat insulating material 11 such as alumina is provided on the top end portion of the pillar 5 and the bottom plate 12. The material to be solidified 10 is enclosed between the heat insulating materials 11.

In the figure, 3 is a choke.

Since it is configured as described above, first, the bottom plate 12
The material 10 to be solidified is put into the heat-resistant heat-insulating dielectric 9 on the heat-insulating material provided above, and the columns 5 are formed using the hydraulic cylinder 1.
The microwave is introduced from the microwave supply port 8 while sliding on and pressing the material 10 to be solidified. The material 10 to be solidified is heated and sintered by this microwave. At the time of this sintering, microwave power is low because it is pressurized by the pillar 5.

The bottom plate 12 on the base 13 and the heat insulating material 11 on the bottom plate 12 are unnecessary if the base 13 has the function of the heat insulating material 11.

〔The invention's effect〕

As described above, according to the present invention, since the microwave is used as the heating source, the material to be solidified (sample) can be directly heated by the microwave, so that the thermal efficiency is good.

Further, according to the present invention, since the material to be solidified can be heated by the microwave, the temperature rise can be accelerated.

Further, according to the present invention, since the mold (heat resistant heat insulating dielectric) is not directly heated from the outside, deterioration of the mold can be suppressed.

Furthermore, according to the present invention, since the sample is solidified during compression molding, the scattering of the sample is small, and the post-process is easy.

Further, according to the present invention, since the material to be solidified is pressurized, it can be solidified at low power and low temperature as compared with the conventional microwave melting and solidifying apparatus that does not apply pressure, and the working power is small, so the discharge is performed. Difficult to cause.

Furthermore, according to the present invention, by adding a substance capable of being melted by microwaves such as glass, it is possible to solidify a powdery substance which cannot be conventionally sintered or melt-solidified by microwaves.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a conventional microwave melting device. 1 ... hydraulic cylinder, 2 ... press body, 4 ... microwave heating body, 5 ... pillar, 9 ... heat-resistant heat insulating dielectric, 10 ... solidified material, 11 ... heat insulating material, 13 ... Base.

Claims (2)

[Claims] 1. A microwave tuning type heating apparatus for introducing microwave into a microwave heating furnace main body to heat and sinter the object to be sintered, wherein the object to be sintered is provided at a central portion of the microwave heating furnace main body. Is provided with a piston for pressurizing, and a heat-resistant heat-insulating dielectric body provided in a cylindrical shape around the piston so that the piston slides densely is provided in the lower portion of the micro-heated furnace main body. A microwave sintering compression molding and solidifying device, characterized in that a material to be sintered is put into a heat-resistant adiabatic dielectric material, and microwaves are applied and heated and sintered under pressure of the piston. 2. The microwave sintering compression solidification apparatus according to claim 1, wherein the sintered product contains a glass material.