Bulletin of the American Physical Society
75th Annual Gaseous Electronics Conference
Volume 67, Number 9
Monday–Friday, October 3–7, 2022;
Sendai International Center, Sendai, Japan
The session times in this program are intended for Japan Standard Time zone in Tokyo, Japan (GMT+9)
Session FT2: Plasma Chemical Synthesis and Conversion
10:00 AM–12:00 PM,
Tuesday, October 4, 2022
Sendai International Center
Room: Shirakashi 1
Chair: Masaharu Shiratani, Kyushu University
Abstract: FT2.00007 : Powderization behavior of uranium dioxide solid by non-equilibrium plasma oxidation*
11:45 AM–12:00 PM
Presenter:
ZhuoRan Ma
(Nagaoka Univ of Tech)
Authors:
ZhuoRan Ma
(Nagaoka Univ of Tech)
Takaharu Tatsuno
(Japan Atomic Energy Agency)
Yoshiya Homma
(Tohoku University)
Kenji Konashi
(Tohoku University)
Tatsuya Suzuki
(Nagaoka Univ of Tech)
Now we have proposed that these substitutes are chemically converted into easily soluble substitutes by thermochemical reactions. In order to promote the dissolution of these insoluble substances, the powderization is required. Thermal oxidation can lead to the powderization of solid uranium dioxide and the volatilization of volatile radioactive materials. it is desirable to cause oxidation reactions under the milder conditions for analysis. We therefore developed a non-equilibrium plasma oxidation device to verify the powderization of uranium dioxide solid under lower temperature condition and to compare the results with thermochemical oxidation. we confirmed the powderization of uranium dioxide solid, and that uranium dioxide was converted to triuranium octoxide by XRD. We found that the particle size distribution is obeyed the logarithmic normal distribution with 30.32±20.07μm.From results of SEM observation, the very small uneven bumps of 1µm or less appears on the surface of powders was observed, therfore, the increasing the surface area required for dissolution or chemical conversion to soluble compounds can be expected.
As a conclusion, a plasma oxidation reactor using non-equilibrium plasma was developed and the feasibility of the powderization of solid Uranium Dioxide material was possible with a lower temperature(less than 200℃) compared to the thermochemical oxidation (350-650℃).
*This work is financially supported by the Nuclear Energy Science & Technology and Human Resource Development Project (through concentrating wisdom) from the Japan Atomic Energy Agency / Collaborative Laboratories for Advanced Decommissioning Science.
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