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Nitrous acid is not convenient for the subsequent U/Pu partitionning and can speed up solvent degradation. Nitric oxydation of the tetravalent neptunium is slow at room temperature : N p * + 1/2 N 0 " 1 3 + 3/2 H 0 —*> 2 Np0 + 2 + 1/2 H N 0 2 + 5/2 IT (3) Iron is a catalyst above 1 0 " M. 6 kcal/mole [8]. Mechanism involve NpV disproportionation which is the limiting step for high H N 0 concentrations. This reaction essentially takes place in evaporator after the partitionning cycle. 2 Reduction reactions In the U/Pu separation, and in plutonium purification cycles, powerful reducing agents are used.

30 I I I 11 10 N CHEMICAL PROPERTIES OF NEPTUNIUM APPLIED TO NEPTUNIUM MANAGEMENT IN EXTRACTION CYCLES OF PUREX PROCESS. B. P. Moulin,** Ch. Maurice* Alternative ways of managing neptunium in the Purex process are discussed. Main coordination and redox properties of neptunium in nitric medium are reviewed. Kinetics results with reagents consistent with "salt free process" are presented with emphasis on the influence of uranium and plutonium ions, including results about some peculiar behaviour of neptunium in TBP (the so-called cation-cation complexes).

This method, however, is complex and can introduce a number of errors. * ** Dounreay Nuclear Power Development Establishment, UKAEA, Thurso, Caithness, UK. E. S Y M P O S I U M SERIES No. 8 8 Both concentration profiles and the extent of axial mixing are being measured in the Dounreay pulsed column. However, this report is confined to the results arising from the concentration profile technique. A method has been developed for obtaining pure dispersed and continuous phase samples directly from the column, containing no trace of contamination by the opposite phase.

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