Purex过程镎分离和纯化的研究

    A STUDY ON THE SEPARATION AND PURIFICATION OF NEPTUNIUM IN THE PUREX PROCESS

    • 摘要: 本文报道了用串级萃取方法研究普勒克斯过程铀线镎的走向的控制,并推荐了从铀线2DW中定量回收、分离、纯化镎的合适工艺条件。讨论了影响因素。按所推荐工艺条件,2D槽2DW中镎回收率达97.3—99.9%,铀损失小于160毫克/升。3D镎萃取槽中,镎回收率可以达到约99—99.6%。镎中钚分离系数达(1.4~3.5)×10~3。2N镎反萃槽中,镎回收率可达99.3—99.5%,镎中去铀分离系数为2×10~2—1.7×10~3,镎中钍分离系数40—5.4×10~2,镎中钚分离系数仅为2.3—5.3左右。

       

      Abstract: The control of path of Np in the purex process by using cascade count-current extraction method is investigated. Well-defined conditions for recovery, separation and purification of Np from the stream 2DW of 2nd. U-cycle are proposed.The factors effecting the process, such as the HNO3 concentration of the feed, the degree of uranium saturation of organic phase, the concentration of H2C2O4, the acidic concentration of stripping solution and the temperature of strip are discussed.The recovery of Np in 2DW stream was 97-99.9%. The loss of uranium to 2DW stream was less than 0.2 g/1. In the 3D extraction, jostactor, recovery of Np was 99-99.6%. The y-decontamination factor of Np from the mixture fission product elements was about 1×102-3×102. In the 2N stripping contactor recovery of Np was 99.3-99.5%. Separationfactor of Np from U(i.e. SFU) was 1.7 × 103-2×102, SFth---40 - 5.4×102, SFPu-----2.3-5.3. The decontamination factor of Np from the γ-emitters was about 1.4 -1.6. The main factor limitting the overall decontamination of Np was 95Zr as well as 106Ru and 95Nb.

       

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