Development of a Sorption Technique for the Selective Separation of Plutonium and Americium from Nitric Acid Intermediate-Level Wastes of Chemical and Metallurgical Production.

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    • Abstract:
      The sorption extraction of Pu and Am from nitric acid simulation solutions were studied on a solid extractant (TVEX) AXIONIT MND 40T in a static mode. It is shown that the distribution coefficients of Pu and Am on TVEX reach maximum values ​​in 7.5 M HNO3. Desorbing solutions were selected that make it possible to selectively extract the target components from the TVEX phase. For effective desorption of Pu, it is advisable to use a reducing desorbing solution of the following composition: 3.5 M HNO3, 10 g/L ascorbic acid (C6H8O6), 0.2 M N2H4; for desorption of Am, a solution of 10 g/L diethylenetriaminepentaacetic acid (DTPA) with pH 5–6. The values ​​of the full dynamic exchange capacity (FDEC) of TVEX for Pu and Am were 12 and 16 g/L, respectively. The fundamental possibility of sorption separation of Pu and Am from real intermediate-level liquid wastes (ILW) of chemical and metallurgical production (CMP) at TVEKS was established. A two-stage sorption technique for the separation of Pu and Am from liquid ILW of CMP was developed, which provides for the adjustment of the HNO3 concentration in solutions, the extraction of Pu on the Purolite S957 cation exchange resin, the concentration of Am from the filtrate on the TVEX, the desorption of Pu and Am from the sorbent phase, the regeneration of the TVEX, and the additional purification of the Am desorbate on the cation exchange resin Purolite S957 if it is necessary to yield a purified 241Am concentrate. [ABSTRACT FROM AUTHOR]
    • Abstract:
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