【摘要】 为了分离钛白废酸中的Sc与杂质离子，研究了N503-P204和TBP-P204两种协萃体系对钛白废酸中的Sc、Ti、Fe和Al的萃取分离行为。结果表明：在25℃、O/A=1∶20条件下，通过二级逆流萃取，5%N503+5%P204+90%磺化煤油、5%TBP+5%P204+90%磺化煤油体系的Sc萃取率分别达99.74%和99.73%。在N503-P204协萃体系中，在温度35℃、O/A=1∶2条件下，用1 mol/L磷酸二级逆流洗涤出99.34%Ti,而TBP-P204协萃体系在同等条件下只能洗涤出66.22%Ti。结合红外表征证实了N503-P204协萃体系对Sc的萃取分离效果优于TBP-P204协萃体系。在N503-P204协萃体系中，用2 mol/L氢氧化钠在50℃、O/A=3∶1的条件下进行反萃，Sc反萃率达到99.28%,同时将Fe、Al等杂质留在有机相中，实现了Sc的回收。更多还原

【Abstract】 In order to separate Sc and impurity ions from titanium white waste acid, the extraction and separation behaviors of Sc, Ti, Fe and Al from titanium white waste acid by N503-P204 and TBP-P204 synergistic extraction systems were studied.The results show that the Sc extraction rates in the systems of 5%N503+5%P204+90% sulfonated kerosene and 5%TBP+5%P204+90% sulfonated kerosene are 99.74% and 99.73%,respectively by two-stage countercurrent extraction under the conditions of 25 ℃ and O/A=1∶20.In the N503-P204 synergistic extraction system, 99.34%Ti is eluted with 1 mol/L phospho-ric acid through two-stage countercurrent washing under the conditions of 35 ℃ and O/A=1∶2,while only 66.22% Ti is eluted in TBP-P204 synergistic extraction system under the same conditions.Combined with infrared characterization, it is confirmed that the extraction and separation efficiency of N503-P204 synergistic extraction system on Sc is superior to that of TBP-P204 synergistic extraction system.In N503-P204 synergistic extraction system, when 2 mol/L sodium hydroxide is used for stripping under the conditions of 50 ℃ and O/A=3∶1,Sc stripping rate reaches 99.28%,while Fe, Al and other impurities are left in the organic phase, realizing Sc recovery.更多还原