JP5360380B2 - Method for detecting state of metal particles in glass - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for simply detecting a distribution of metal particles in glass by a small device. <P>SOLUTION: The state detection method of metal particles in glass includes processes for: arranging metal powder on the upper surface of glass dissolved and solidified beforehand in a container; melting solidified glass and glass crushed material inside by heating the container, and maintaining the molten state for a set time; solidifying molten glass containing the metal powder by cooling the container after the process for maintaining the molten state; and moving an ultrasonic probe along the outer surface of the container after the solidifying process, and detecting the distribution of the metal particles in the glass. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a method for detecting the state of metal particles in glass.

High-level radioactive liquid waste discharged at nuclear facilities is pretreated and then mixed into molten glass in a glass melting furnace. The molten glass mixed with the liquid waste is poured into another container and solidified together with the container. Stored in a radioactive waste storage facility.
The waste liquid mixed in the molten glass contains metal particles. In particular, clustered metal particles concentrate and accumulate on a part of the bottom of the melting furnace, and the accumulated metal particles discharge the melting furnace. There is a possibility that the holes may be blocked or the electrodes for heating the melting furnace may be short-circuited to cause a problem that the molten glass cannot be heated sufficiently. In order to prevent the occurrence of these problems, it is useful to know the state of the metal particles in the molten glass, particularly the sedimentation speed.

  In order to detect the state of the metal particles in the molten glass, the present applicant placed the metal particles on the glass solidified in advance in the container, melted by heating with the container, and solidified after a set time. A method of obtaining and analyzing samples was adopted. In the analysis of a sample, the sample is cut together with a container, and the state of metal particles is directly examined from the cut surface. In order to know the sedimentation rate of the metal particles in the molten glass, a plurality of samples having different melting times were prepared, and the states of the metal particles obtained from these samples were compared with each other and analyzed.

  Patent Document 1 discloses an X-ray CT apparatus. In this X-ray CT apparatus, a plurality of X-ray generation sources and detectors are arranged around a measurement object, and the X-ray generation source is mechanically rotated.

JP 2005-265559 A

In the case where the above sample is cut and the state of the metal particles is directly examined from the cut surface, there is a limit to the analysis accuracy, and a plurality of samples must be prepared to know the settling speed of the metal particles. There is a problem that the cost increases. Further, the X-ray CT apparatus itself has a problem that the whole apparatus is large and complicated, and the cost is increased.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for easily detecting the state of metal particles in a vitrified body with a small apparatus.

In the method for detecting the state of metal particles in glass according to claim 1 of the present invention, a mixture of metal particles and crushed glass is disposed on the upper surface of glass previously melted and solidified in a container, and around and melting and filling a glass crushed at the top, and the solidified glass inside by heating the container, a glass crushed the mixture, and the glass crushed material filled around and above the mixture And maintaining the molten state for a set time, and after the step of maintaining the molten state, cooling the vessel and solidifying the molten glass containing the metal particles and the glass crushed material , After the solidifying step, the ultrasonic probe is moved along the outer surface of the container to detect the distribution of metal particles in the glass.

  The method for detecting the state of the metal particles in the glass according to claim 2 is the method according to claim 1, wherein after the detecting step, the container is reheated to remelt the solidified glass containing the metal particles. And maintaining the remelted state for a set time, maintaining the remelted state, recooling the container to resolidify the molten glass containing the metal glass, After the solidifying step, the ultrasonic probe is moved along the outer surface of the heat-resistant container, the step of re-detecting the distribution of metal particles in the glass, the step of detecting after the step of re-detecting A step of calculating a sedimentation rate of the metal particles as compared with the distribution of the metal particles in the obtained glass.

In the method for detecting the state of metal particles in glass according to claim 1 of the present invention, a mixture of metal powder and crushed glass is disposed on the upper surface of glass previously melted and solidified in a container, and around and in terms of placing the glass crushed to top, and the glass by heating the container, a glass crushed mixture, since melting and glass crushed material filled around and on top of the mixture, melt in the actual wastewater treatment A situation similar to the settling of metal particles in the finished glass can be created. And after maintaining the molten state of the glass for a set time, the glass is solidified, and then the distribution of metal particles in the glass is detected by an ultrasonic probe, so it is a solidified glass, but in the actual molten glass A distribution close to the distribution of metal particles in can be detected. Therefore, it is not necessary to cut the glass, and it is possible to detect a state close to the distribution of metal particles in the molten glass at a small size and at a low cost.

  The glass metal particle state detection method according to claim 2 is a method of heating and melting the glass solid body (sample) containing the metal particles after the detection, maintaining the molten state for a set time, and then cooling again. Then, the glass is solidified, and then the distribution of metal particles in the glass is detected again by an ultrasonic probe. Then, the distribution of the metal particles in the glass detected first and the distribution of the metal particles in the glass detected this time are compared to calculate the sedimentation rate of the metal particles. The moving state of the particles can be observed, and the cost can be greatly reduced.

It is sectional drawing which shows the process of throwing metal powder in the container in one Example of this invention. It is sectional drawing which shows the process of heating a container. It is explanatory drawing which shows the detection state by an ultrasonic probe.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a process of putting metal particles on the upper surface of glass previously melted and solidified in a container in an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a process of heating the container, and FIG. It is sectional drawing which shows the detection state by a probe.
First, as shown in FIG. 1, the method for detecting metal particles in glass in the present embodiment has metal particles and glass fragments on the upper surface of glass 4 previously melted and solidified in a cylindrical Tamman tube 2 that is a heat-resistant container. And a first step of disposing the mixture 6. In addition, the crushed glass is further filled around and at the top of the mixture 6. Next, as shown in FIG. 2, the second step of heating the Tamman tube 2 by the electric furnace 8 to melt the glass 4 and the crushed glass in the Tamman tube 2 and maintaining the molten state at a set temperature for a set time. It has. Next, the third step of cooling the Tamman tube 2 to solidify the molten glass containing metal particles inside is provided. And after a 3rd process, as FIG. 3 shows, the ultrasonic probe 10 is moved along the outer surface of the Tamman tube 2, and the 4th process of detecting the distribution of the metal particle M in glass is provided. ing. The movement, oscillation and reception of the ultrasonic probe 10 are controlled by a control device 14 provided between the probe 10 and the computer 12. The detection of the metal particles M in the fourth step is basically the same as the generally known acoustic flaw detection method. That is, the reflected wave with respect to the ultrasonic wave oscillated from the ultrasonic probe 10 to the Tamman tube 2 is monitored by the computer 12, and the position where the metal particle M exists is detected. Many metal particles M are usually clustered by bonding a plurality of metal particles.

  According to the above-described configuration, in the first step and the second step, the container 2 is heated in a state in which the mixture 6 of the metal particles and the crushed glass is accommodated on the upper surface of the glass 4 previously melted and solidified in the container 2. Therefore, it is possible to create a situation similar to the sedimentation of metal particles in molten glass in actual waste liquid treatment. In the second step, after the molten state of the molten glass in the container 2 is maintained at the set temperature for a set time, the molten glass is solidified in the third step, and then in the fourth step, the ultrasonic probe 10 is solidified. Thus, the distribution of the metal particles M in the vitrified body is detected. For this reason, although the glass is solidified, a distribution close to the distribution of metal particles in the actual molten glass can be detected. Therefore, a state close to the distribution of the metal particles in the molten glass can be detected with a small apparatus and at a low cost without cutting the glass.

  Furthermore, in the detection method in this embodiment, after the fourth step, the solidified glass is reheated and melted together with the container 2, and the molten glass in the container 2 is maintained at a set temperature for a set time. It has. Next, after the fifth step, a sixth step of re-cooling the container and re-solidifying the molten glass containing the metal particles is provided. Then, after the sixth step, the ultrasonic probe 10 is moved along the outer surface of the Tamman tube 2 in exactly the same manner as in the fourth step described above, and the distribution of the metal particles M in the glass is detected again. It has a process. Further, after the seventh step, the distribution of the metal particles in the glass detected in the fourth step and the distribution of the metal particles in the glass detected in the sixth step are compared to calculate the settling velocity of the metal particles. Eight steps are provided. In the eighth step, more specifically, in comparison between the distribution of the metal particles in the glass detected in the fourth step and the distribution of the metal particles in the glass detected in the seventh step, the settling distance and melting time of the metal particles. Based on this, the sedimentation velocity is calculated.

  Therefore, according to this detection method, in the fifth step, the vitrified body (sample) containing the metal particles that has been detected in the fourth step is reheated and melted, and the molten state is set at a set temperature for a set time. After being maintained, the sample in the molten state is again cooled and solidified in the sixth step, and then the distribution of the metal particles M in the glass is detected again by the ultrasonic probe 10 in the seventh step. Then, the distribution of the metal particles M in the glass detected in the fourth step and the distribution of the metal particles M in the glass detected in the seventh step are compared to calculate the settling velocity of the metal particles, so that the same sample Can be used to observe the movement of the metal particles in the glass, and the cost can be greatly reduced.

  This is the end of the description of the present embodiment, but the present invention is not limited to this embodiment, and various modifications are possible. For example, in the above embodiment, after finishing the detection in the seventh step, the fifth step to the seventh step are repeated again, and the settling rate of the metal particles in the glass is determined in the eighth step based on the detection result of three times in total. It can also be configured to calculate. Furthermore, the number of repetitions of the fifth to seventh steps can be increased as necessary.

2 Tamman tube 4 Vitrified body

Claims (2)

Placing a mixture of metal particles and crushed glass on the upper surface of glass previously melted and solidified in a container, and filling the crushed glass around and above the mixture ;
Step of maintaining said solidified glass inside by heating the container, a glass crushed the mixture was melted and the glass crushed material filled around and above the mixture, the molten state setting time When,
After the step of maintaining the molten state, the step of cooling the container to solidify the molten glass containing the metal particles and the crushed glass, and
A method for detecting the state of metal particles in glass, comprising a step of detecting the distribution of metal particles in the glass by moving an ultrasonic probe along the outer surface of the container after the solidifying step. Furthermore, after the detecting step, reheating the container to remelt the solidified glass containing the metal particles, and maintaining the remelted state for a set time;
After the step of maintaining the remelted state, recooling the container to resolidify the molten glass containing the metallic glass;
After the re-solidifying step, moving the ultrasonic probe along the outer surface of the heat-resistant container, re-detecting the distribution of metal particles in the glass,
The metal in the glass according to claim 1, further comprising a step of calculating a settling rate of the metal particles in comparison with a distribution of the metal particles in the glass obtained in the detecting step after the redetecting step. Particle state detection method.

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