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在有或无三-n-辛基磷氧化物(TOPO)存在的情况下,用二(2-乙基己基)磷酸(DEPA)溶剂萃取法从膦酸中提取铀时,稀土元素(REEs)得到萃取。对此,至今还没有引起人们注意.REEs是在有和无U(Ⅳ)的情况下以氟化物形式提取出来的。本研究是对引入磷酸介质中的REEs系列的每一元素采用放射性同位素来进行的.REEs的回收过程,制得含稀土元素浓缩物的产品。试验研究中,所采用的两种工业萃取剂为DEPA和苯基膦酸。还用磷氮溶液进行了类似试验研究.试验证明,从磷酸介质中萃取对钇有利;而从磷氮溶液中萃取,则对铈和钇有利.因此,在回收过程中,REEs可得到优先分离。
When extracting uranium from phosphonic acid with bis (2-ethylhexyl) phosphoric acid (DEPA) solvent extraction in the presence or absence of tri-n-octylphosphine oxide (TOPO), rare earth elements (REEs) Get extracted. To this date, no attention has been drawn so far .REEs are extracted as fluoride with and without U (IV). This study is the introduction of the REEs series of phosphoric acid medium for each element using radioisotopes to carry out the recovery process of .REEs, obtained with rare earth element concentrate products. In the experimental study, the two industrial extractants used were DEPA and phenylphosphonic acid. A similar experimental study was also conducted with a phosphorous-nitrogen solution, which demonstrated that extraction from a phosphoric acid medium is beneficial for yttrium and that extraction from a phosphazene solution favors both cerium and yttrium, so REEs can be preferentially separated during recovery .