203. 放射性焼却灰の高周波溶融固化試験

抄録

This study was undertaken to confirm the applicability of the induction heat melting process for solidification of residue produced by incinerating radioactive solid wastes. Tests were performed to collect data on the behavior of radionuclides in the melting process and on properties of the solidified products using actual incineration residue and a test apparatus (capacity: 5kg/h).
The test results and operational experience have confirmed that the induction heat melting process has following advantages:
(1) The process can be operated steadily even if the residue contains some massive and misplaced materials.
(2) Most radionuclides in ash can be enclosed in the solidified products. The released radionuclides can be trapped efficiently with the ceramic filter in the off-gas cleaning system.
(3) The solidified products have high compressive strength (80-180MPa) and high resistance against leaching (⁶⁰Co: 10^-9-10^-11cmcm²/d, ¹³⁴Cs: 10^-7-10^-9cmcm²/d).
(4) High volume reduction ratio (3-6) can be obtained compared with other solidification processes.
It is concluded that the induction heat melting process is a practical candidate for the solidification of radioactive incineration residue.