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- W4241943247 abstract "The precipitation behavior of Pu. Np and Am during the denitration of high-level radioactive liquid waste (HLW) by formic acid was studied using a simulated HLW. The dissolution of the precipitate formed in denitrated HLW was also studied using oxalic acid to recover transuranium (TRU) elements from the precipitate. In the denitration, the precipitated fractions of TRU elements increased with decreasing acidity of the denitrated HLW. In the denitration at [HCOOH]/[HNO3]=1.5, which was adopted in the partitioning process developed in JAERI, the precipitated fractions of Np and Am were only 0.6% and 0.06%, respectively, whereas that of Pu was 90 %. The precipitation fractions of Pu and Np did not depend on their concentrations in the range of 6x10−5–6x10−4 M for Pu and 10−5–10−3 M for Np. Plutonium was not precipitated itself by polymerization or hydrolysis but coprecipitated with other elements such as Mo and Zr. It was found that the precipitate formed during the denitration of 1 l of HLW could be dissolved in a 800 ml of 0.5 M oxalic acid solution." @default.
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- W4241943247 date "1992-06-01" @default.
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- W4241943247 title "Precipitation Behavior of Transuranium Elements during Denitration of High-Level Radioactive Liquid Waste by Formic Acid" @default.
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- W4241943247 doi "https://doi.org/10.1080/18811248.1992.9731564" @default.
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