Study on the Extraction and Separation of Scandium by N503-P204 and TBP-P204 Synergistic Extraction Systems AITranslate

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Chinese Library Classification Number:TF804.2[冶金工程—有色金属冶金]

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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 phosphoric 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.