TEVA-UTEVA萃取色层分离后处理铀产品中镎的方法研究

Separation Method of Neptunium From Reprocessed Uranium by TEVA-UTEVA Extraction Chromatography Column

摘要: 本文建立了有效、定量分离后处理铀产品中镎的方法。该方法采用TEVA-UTEVA萃取色层分离后处理铀产品中的微量镎，先将镎调至四价后过TEVA萃取色层柱，再用2 mol/L HNO₃-0.2 mol/L H₂C₂O₄解吸吸附在TEVA树脂上的镎，最后将镎解吸液稀释后过UTEVA萃取色层柱进一步分离。结果表明，镎的平均全程回收率约为94%，铀的去污因子＞10⁴。

Abstract: An efficient and quantitative extraction chromatographic method using commercially available TEVA resin and UTEVA resin was developed for the separation of neptunium from reprocessed uranium. Before the sample was loaded onto TEVA column, neptunium was adjusted to Np(Ⅳ), and then the eluent of 2 mol/L HNO₃-0.2 mol/L H₂C₂O₄ was loaded to elute the neptunium，the uranium in eluent after diluting was retained on UTEVA resin, while Np(Ⅳ) was stripped from the resin. The average recovery of neptunium of the whole separation procedure is about 94% and the decontamination coefficient of uranium is more than 10⁴.