乙羟肟酸消除Zr界面污物的研究  

Prevention of Interphase Crud Formation by Acetohydroxamic Acid

作　　者：叶国安[1] 石伟群[1] 唐洪彬[1] 

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413

出　　处：《原子能科学技术》2006年第3期283-287,共5页Atomic Energy Science and Technology

摘　　要：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。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（ill） loaded in TBOPDA/OK is not effectively removed by dilute aqueous HNO3-AHA solution. The back extraction of Am（Ⅲ） by HNO3-AHA solution can be greatly depressed by increasing HNO3 concentration in the stripping solution.

关 键 词：乙羟肟酸 界面污物 酰胺荚醚 Zr(Ⅳ) 

分 类 号：TL24[核科学技术—核燃料循环与材料]