乙羟肟酸消除Zr界面污物的研究

研究在模拟高放废液中加入乙羟肟酸（AHA）以消除酰胺荚醚（TBOPDA）萃取模拟高放废液过程中的界面污物。萃取实验结果表明：在模拟高放废液中加入AHA可显著降低Zr（Ⅳ）在两相中的分配比，此时，Pu（Ⅳ）的分配比仍足够大，它不影响TBOPDA对Pu（Ⅳ）的回收。反萃实验表明：在所研究的反萃条件下，1级反萃即可有效反萃TBOPDA有机相中的Zr（Ⅳ）；3次错流反萃可有效反萃TBOPDA有机相中的Pu（Ⅳ）；反萃液中加入AHA对Am（Ⅲ）的累计反萃率影响很小；提高反萃液的酸度可抑制TBOPDA有机相中Am（Ⅲ）的反萃。

Prevention of Interphase Crud Formation by Acetohydroxamic Acid

The method of elimination of crud formation by addition of acetohydroxamic acid(AHA) into the feed solution of simulated high-level liquid waste(HLLW) extracted by N,N,N′,N′-tetrabutyl-3-oxa-pentanediamide(TBOPDA)/OK was studied in the paper. The results of extraction experiments show that the distribution ratio of Zr(Ⅳ) sharply decreases as the increase with the concentration of AHA in the aqueous phase, while the distribution ratio of Pu(Ⅳ) remains high enough for its recovery. The stripping of Pu(Ⅳ), Zr(Ⅳ), and Am(Ⅲ) from the TBOPDA/OK phase were also studied. Zr(Ⅳ) can be effectively removed from the organic phase by a single stripping with a 0.2 mol/L AHA solution or a 0.01 mol/L HNO₃. Complete back -extraction of Pu(Ⅳ) was attained by three stages of cross-flow stripping with 0.05 mol/L AHA-0.1 mol/L HNO₃ or 0.2 mol/L AHA 0.01 mol/L HNO₃. Am(Ⅲ) loaded in TBOPDA/OK is not effectively removed by dilute aqueous HNO_3^-AHA solution. The back extraction of Am(Ⅲ) by HNO₃-AHA solution can be greatly depressed by increasing HNO₃ concentration in the stripping solution.