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根据精馏理论及单2-乙基己基膦酸2-乙基己基酯(P-507)萃取稀土的机理和性能,提出了用P-507逆流液液回流萃取富集镥的流程。通过模拟试验,设计了在混合澄清器中由十一级萃取转相、二十级贫化、六十级富集、三十级硝酸反萃转相、七级盐酸反萃和二级水洗的流程,经过较长时间的运转,表明本流程可以由混合重稀土(Tm<1％、Yb～89％、Lu～8％、Y～3％)中获得纯度大于99.95％和收率大于98％的镥,并在贫化段中可以定量回收纯度>92％(Lu<0.4％)的镱。稀土总收率为98％,与传统的萃取-汞齐-离子交换法相比较,本法具有产率高、成本低、工艺简单和无汞害的优点。
According to the theory of distillation and the mechanism and properties of rare earth extracted by 2-ethylhexyl phosphonic acid 2-ethylhexyl ester (P-507), the process of reflux extraction of P-507 with P-507 was proposed. Through the simulation experiment, a series of experiments have been designed, including eleven extraction phase inversion, twenty depletion, sixty enrichment, thirty-phase nitric acid stripping, seven-stage hydrochloric acid stripping and two-stage washing After a long period of operation, the process shows that the purity of the mixed rare earth can reach more than 99.95% and the yield is more than 98% from mixed heavy rare earths (Tm <1%, Yb ~ 89%, Lu ~ 8%, Y ~ 3% , And ytterbium with a purity of> 92% (Lu <0.4%) can be quantitatively recovered in the depletion stage. The total rare earth yield is 98%. Compared with traditional extraction-amalgam-ion exchange method, this method has the advantages of high yield, low cost, simple process and no mercury damage.