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硝酸介质中镅与镧系元素的DPTP分离研究

Separation of Americium From Lanthanides in Nitric Acid Medium by DPTP in Octanol-Dodecane

    摘要
  • 摘要: 选定2,6-二-(5,6-二正丙基-1,2,4-三嗪-3-取代)-吡啶(DPTP)萃取体系，以Am和Eu作为三价锕系与镧系元素的代表，实验考察平衡时间、萃取剂浓度、水相酸度等对Am与Eu萃取分配比的影响。在此基础上，提出了DPTP萃取锕系和镧系的概念流程，并用串级实验进行了验证。实验结果表明：经6级萃取、2级洗涤、6级反萃，Am的收率为98.42%，Eu的萃取率小于0.1%；有机相中Am、Eu的反萃率均大于99.9%；分离因子SFAm/Eu＝45，SFEu/Am>103。

     

    Abstract: Considering the good solubility of 2,6-bis(5,6-di-n-propyl-1,2,4-triazin-3-yl)-pyridine (DPTP) and avoiding the third phase formation, octanol-dodecane (ODOD) with a volume fraction of 30% was selected as the diluent. The distribution ratios of Am（Ⅲ） and Eu（Ⅲ） were studied as a function of a number of parameters such as contact time, nitrate ion and the nitric acid concentration in aqueous phase, the concentration of DPTP in the organic phase. A counter-current cascade (10 mL glass tube with plug) extraction experiment was carried out with 0.04 mol/L DPTP/ODOD. In the experiments, the flow rate ratios are as following: F∶X∶S=1∶0.63∶0.25, BF∶BX =1∶1; the feed solution, Eu(Ⅲ)+Am(Ⅲ) in 1.0 mol/L HNO3 solution; scrubbing solution, 1.0 mol/L HNO3 solution; stripping reagent, 0.01 mol/L HNO3. The results show that the recovery of Am is 98.42%, only containing <0.1% Eu in the organic solvent, and the stripping efficiency of Am and Eu both are 99.9%, the separation factor of SFAm/Eu is 45, SFEu/Am is more than 103.

     

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