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PARTITIONING OF NEODYMIUM AND AMERICIUM IN THE LIQUID RADIOACTIVE WASTE BY OXALATE PRECIPITATION
Korean Journal of Chemical Engineering, November 1995, 12(5), 557-562(6), 10.1007/BF02705859
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Abstract
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, alkaline earth, and transition metals in nitric acid solution. The effect of concentrations of oxalic acid and nitric acid in the simulated waste on the precipitation yield and purity of Nd and Am was examined in this study. As a result, the precipitated fraction of each element was increased with increasing concentration of oxalic acid and decreasing concentration of nitric acid. At an initial concentration of 0.5 M nitric acid and 0.5 M oxalic acid, both Am3+ and Nd3+ were precipitated over 99% and other elements almost remained in the simulated solution. It was also found that Am was completely coprecipitated with Nd-oxalate precipitates, and Zr4+ caused the coprecipitation of Cs+, Sr2+, and Pd2+.
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Crouthamel CE, Martin DS, J. Am. Chem. Soc., 72, 1382 (1950)
Crouthamel CE, Martin DS, J. Am. Chem. Soc., 73, 569 (1951)
Forsberg CW, Nucl. Technol., 49, 243 (1980)
IAEA Technical Reports Series No. 214, "Evaluation of Actinide Partitioning and Transmutation," IAEA, Vienna (1982)
IAEA Technical Reports Series No. 137, "Chemical Precipitation Process for the Treatment of Aqueous Radioactive Waste," IAEA, Vienna (1992)
Kim EH, in preparation
Kobayashi T, Morita Y, Kubota M, "Development of Partitioning Method: Method of Precipitation Transuranium Elements with Oxalic Acid," JAERI-M88-026 (1988)
Kobayashi T, Shirahashi K, Kubota M, "Development of Partitioning Method: Precipitation Behavior of Other Elements in Separating the Transuranic Elements Group with Oxalic Acid," JAERI-M89-168 (1989)
Kubota M, Fukase T, J. Nucl. Sci. Technol., 17(10), 783 (1980)
Miyashio H, Kubota M, "Development of Partitioning Method: Fundamental Study on Oxalate Precipitation Method," JAERI-M86-0144 (1986)
Medeiaos LO, J. Inorg. Nucl. Chem., 28, 599 (1966)
Posey JC, "Process for the Recovery of Cm-244 from Nuclear Waste," ORNL-5687 (1980)
Rankin DT, Burney GA, Smith PK, Sission RD, Ceram. Bull., 56(5), 478 (1977)
Shirahashi K, Kubota M, J. Nucl. Sci. Technol., 29(6), 61 (1992)
Skalberg M, Liljenzin JO, Nucl. Eng. Int., Feb., 30 (1990)
Tedder DW, Blomeke JO, "Actinide Partitioning and Transmutation Program Progress Report for Period April 1 to June 30, 1977," ORNL/TM-6056 (1977)