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本文报导了用中性(TBP和TOPO)和酸性(D2EHPA)有机磷酸酯从硝酸和磷酸混合液中萃取铀(Ⅵ)。用单一萃取剂TBP、TOPO和D2EHPA及混合萃取剂TBP和D2EHPA、TOPO和D2EHPA进行了实验。当使用单—TOPO作萃取剂时,形成萃合物UO_2(NO_3)_2·2TOPO;而使用单一的D2EHPA时,证明有萃合物UO_2X_2(HX)_2(HX=D2EHPA)存在。D2EHPA还能共萃取少量的HNO_3或NO_3~离子。混合萃取剂TOPO和D2EHPA有协萃性质,已证实能形成萃合物UO_2X_2(HX)_2·TOPO。此外还研究了TBP和D2EHPA之间的协萃效应。
This paper reports the extraction of uranium (Ⅵ) from a mixture of nitric acid and phosphoric acid using neutral (TBP and TOPO) and acidic (D2EHPA) organophosphates. Experiments were performed with single extractants TBP, TOPO and D2EHPA and mixed extractants TBP and D2EHPA, TOPO and D2EHPA. UO_2 (NO_3) _2 · 2TOPO was formed when mono-TOPO was used as the extractant, while the presence of UO_2X_2 (HX) _2 (HX = D2EHPA) was confirmed when using a single D2EHPA. D2EHPA also coextracts a small amount of HNO 3 or NO 3 ions. Mixed extractants TOPO and D2EHPA have a synergistic nature and have been shown to form the complex UO_2X_2 (HX) _2 · TOPO. In addition, the synergistic effect between TBP and D2EHPA was also studied.