Plutonium removal by ion exchange chromatography |
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Authors: | B F Araujo H T Matsuda E I Carvalho I C Araujo |
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Institution: | (1) Comissão Nacional de Energia Nuclear-SP, Instituto de Pesquisas Energéticas e Nucleares, Pinheiros, Caixa Postal 11049, 05499 São Paulo, Brazil |
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Abstract: | A study of Pu recovery at trace level from U solutions by ion exchange technique is presented. Plutonium retention >99.5% onto strong anionic resin, AG-X8, from nitric acid solutions and a 92% recovery using 0.4M HNO3 at 60°C as eluent, were obtained. Uranium interference in Pu sorption from mixed U/Pu nitrate solutions with low U/Pu ratio ( 25) was not verified. However, for high U/Pu ratio solutions ( 10000), uranium interference in Pu retention on the resin, decreases to 59%. Selecting the loading conditions and using AG-X4 resin, 99% Pu retention was achieved. The Pu product is still contaminated with U and another purification cycle is recomended. A scheme for U/Pu first cycle separation is proposed. |
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