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Article
Salt evaporation behaviors of uranium deposits from an electrorefiner
From an electrorefining process, uranium deposits were recovered at the solid cathode of an electrorefining system. The uranium deposits from the electrorefiner contained about 30–40 wt% salts. In order to rec...
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Article
Electrochemical de-chlorination/transformation of metal chloride for the preparation of NZP structure product
A new two-step process was investigated to treat LiCl molten salt waste containing volatile radionuclides generated from an electro-metallurgical processing (pyro-processing) of spent oxide fuels. First, the c...
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Article
A study on the photo-reductive precipitation rate of europium sulfate from rare earth mixture by addition of hydrogen peroxide
The influence of H2O2 on the photo-reductive precipitation of Eu3+ from a solution containing Sm3+, Eu3+ and Gd3+ was investigated. The solution contains isopropanol as a reduction agent, ammonium sulfate as a pr...
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Article
Dissolution Mechanism of UO2 in Nitric Acid Solution by Photochemical Reaction
Photodissolution tests of UO2 sintered pellets were carried out in 3M nitric acid solution and at about 50 °C under UV irradiation. The light source was a Hg-lamp emitting a light of 254nm wavelength. In the prod...
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Article
A photo-induced dissolution of UO2 sintered pellets in a simulated solution
The objective of this study is to improve the established dissolution technique of UO2 target by using a photochemical reaction. Photo-dissolution tests of UO2 sintered powder and pellets were carried out in a si...
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Article
Photochemical decomposition of oxalate precipitates in nitric acid medium
This work has been performed as a part of the partitioning of minor actinides. Minor actinides can be recovered from high-level wastes as oxalate precipitates, but they tend to be co-precipitated together with...
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Article
Formation of palladium precipitate by hydrazine in a simulated high level liquid waste
The formation of precipitates by hydrazine was experimentally examined in the simulated high level liquid waste (HLLW), which was composed of 9 elements (Nd, Fe, Ni, Mo, Zr, Pd, Ru, Cs, Sr). Palladium was prec...
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Article
Decomposition of oxalate by hydrogen peroxide in aqueous solution
The decomposition rate of oxalate by hydrogen peroxide has been investigated by a KMnO4 titration method. The rate equation for decomposition of hydrogen peroxide in the aqueous phase is 1n([H2O2]/[H2O2]0)=−k1·t,...
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Article
Partitioning of neodymium and americium in the liquid radioactive waste by oxalate precipitation
The partitioning of americium and neodymium by precipitation with oxalic acid was investigated in the simulated radwaste, which was composed of 10 elements of alkali, akaline earth, and transition metals in ni...
