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M. V. Evsiunina, P. I. Matveev, S. N. Kalmykov, V. G. Petrov
Solvent extraction systems for separation
of An(III) and Ln(III): overview of static and dynamic tests
Abstract
One of the main problems of modern
radiochemistry is the management of high-level waste generated during the
reprocessing of spent nuclear fuel using the PUREX-process. This waste contains
half of the Periodic Table of Elements – As-Cm. To reduce the total
radioactivity of the buried waste, the concept of partitioning and
transmutation has been developed. The implementation of this concept implies
the separation of Am (III), Cm (III) and lanthanides (III). This separation is
a complex chemical problem, since these elements have similar physical and
chemical properties. Liquid extraction is considered the most suitable method
for the separation of Am (III), Cm (III) and lanthanides (III) in chemical
technology. In this work we analyzed the literature on extraction systems with
the separation of americium and lanthanides at the stage of extraction into the
organic phase and at the stage of selective extraction from the organic phase
using water-soluble complexones. Dynamic tests of some extraction systems carried
out over the past 10 years are also described in this work.
Key words: radioactive waste, high-level
waste, liquid extraction, americium, lanthanides, separation.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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