Abstract
A process combining liquid–liquid extraction with ion exchange for strontium traces removal in the presence of an excess of sodium concentrations is described. In this continuous process, strontium is extracted from acidic (0.9 M) solution using a substoichiometric amount of dicyclohexano-18-crown-6 (0.1 M in CHCl3). Extracted strontium is readily stripped from an organic phase with water and concentrated onto an ion exchanger. This process allows a high strontium decontamination factor (250) with a very important extraction factor (5000).
Highlights
Large volumes of liquid wastes are generated during spent nuclear fuel reprocessing
These effluents impose a complex treat ment composed of several steps of coprecipitations with various chemical reagents [Ba(N03h, Fe(N03h, ...] before releasing, and satis
The aim of this paper is to report a new continuous process combining liquid-liquid extraction with ion exchange for strontium trace removal in the presence of an excess of sodium
Summary
Large volumes of liquid wastes are generated during spent nuclear fuel reprocessing. Weakly radioactive, these effluents impose a complex treat ment composed of several steps of coprecipitations with various chemical reagents [Ba(N03h, Fe(N03h, ...] before releasing, and satis-factory at the level of the rejection norms presently enforced, the method presents many disadvantages. Large volumes of liquid wastes are generated during spent nuclear fuel reprocessing Radioactive, these effluents impose a complex treat ment composed of several steps of coprecipitations with various chemical reagents [Ba(N03h, Fe(N03h, ...] before releasing, and satis-. The method is not very selective; it gener ates important amounts of low activity solid wastes and requires a signifi cant volume of chemical reagents before disposal can occur. Because of both the assumed high cost of waste immobilization and disposal, and the increasing concern toward protection of the environment [2], a more effective process to minimize the volume of waste is desirable.
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