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由于U(IV)在空气中的化学稳定性较差,因此有关溶剂萃取U(IV)的研究文献报道甚少.近年来,发现不同价态铀在进行化学交换时有明显的同位素富集效应后,溶剂萃取U(IV)的研究引起了人们重视.Kiwan等自1971年起连续报道了HDEHP从过氯酸、盐酸和硫酸介质中萃取U(IV)的研究.Solovkin研究了TBP从硝酸介质中萃取U(IV)的机理并计算了它们的平衡常数.陈金榜等报道了TTA和TBP混合萃取剂对U(IV)的协同萃取.最近冠醚萃取剂也已用于从盐酸介质中萃取U(IV). 中性磷类萃取剂磷酸三丁酯(TBP)和三辛基氧化膦(TOPO)仍是目前应用较广的两种萃取剂.它们从氯化物介质中萃取金属离子的能力远大于硝酸盐.对四价锕系元素的
Due to the poor chemical stability of U (IV) in air, there are few reports on U (IV) solvent extraction.In recent years, it has been found that different valence uranium have obvious isotopic enrichment effects (IV) has attracted much attention recently.Kiwan et al. Reported on the continuous extraction of U (IV) from HDEHP from perchloric acid, hydrochloric acid and sulfuric acid media since 1971. Solovkin studied the effect of TBP from nitric acid (IV) and calculate their equilibrium constants.Chen Jinbang et al. Reported the synergistic extraction of U (IV) from the mixed extractants of TTA and TBP. Recently, the extraction of crown ethers has also been used to extract from the hydrochloric acid medium U (IV) Neutral Phosphorus Extractants Tributyl phosphate (TBP) and trioctylphosphine oxide (TOPO) are still the two most widely used extractants for their ability to extract metal ions from chloride media Much larger than nitrate. For tetravalent actinides