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The evaporation and/or precipitation of liquid radioactive medium level activity liquid waste (MLW) produces concentrates and residues, which have to be disposed of in geological repositories due to the presence of long-lived radionuclides (90)Sr, (137)Cs and actinides). The volume of this waste can be greatly reduced if the long-lived radionuclides are selectively separated from the concentrates and residues. The majority of these wastes would then be directed to a subsurface repository, while the very small part containing the long-lived radionuclides would be disposed of in geological formations after treatment. Extractants based on [3-Co-(1,2-C(2)B(9)H(11))(2)](-) (COSAN), [H(3)N-B(12)H(11)](-), [H(3)N-B(10)H(9)](-) and [CB(11)H(12)](-) have been synthesized and tested. Substitution of good performance but non-environmentally friendly nitrobenzene by mixtures of more acceptable solvents has been successfully achieved mainly by arene B-substituted COSANs. Adequate use of solubilizers and synergist compounds has been performed for selectivity improvement. Monoether chains on COSAN carbon seem to be adequate for actinides extraction. Macrocyclic derivatives of [H(3)-B(12)H(11)](-) seem adequate for (90)Sr sequestering.

Additional information

Authors: TEIXIDOR F, Institut de Ciència de Materials de Barcelona (ES);CASENSKY B, Katchem Ltd, Prague (CZ);DOZOL J F, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);HERMÁNEK S, Institute of Inorganic Chemistry, Rez near Prague (CZ);MONGEOT H, Université Claude-Bernard, Lyon (FR);RAIS J, Nuclear Research Institute, Rez near Prague (CZ)
Bibliographic Reference: EUR 18217 EN (1998) 175pp., ECU 31.50
Availability: Available from the (2)
ISBN: ISBN 92-828-3359-3
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