用P204作萃取剂分离富集钪

The Separation and Enrichment of Sc by P204 Solvent Extraction

用二－（２－乙基己基）磷酸（简称Ｐ２０４）溶剂萃取法，可将钪与大量的共存离子分离，并可将钪富集。分离因数βＳｃ／Ｔｉ接近１０２，βＳｃ／Ｆｅ大于１０３，钪与其它共存元素的分离因数也都在１０３左右。用４％Ｈ２Ｏ２－１ｍｏｌ／ＬＨ２ＳＯ４混合液反萃除去钛，其它离子用０．２ｍｏｌ／ＬＮａＯＨ溶液反萃除去，最后用３．５ｍｏｌ／ＬＮａＯＨ溶液将钪反萃出来。在此过程中，钪的回收率约为９８％，富集因数为１．６×１０３。

The microamount of Scandium (Sc) was separated and enriched from the large amount of coexistent ions by solvent extraction with di-(2-ethy1 hexy1) phosphoric acid (abbreviated formula P204). The βSc/Ti and are βSc/Fe shown as nearly 10 2 and larger than 10 3 respectively,and the separation factors between Sc and other elements are approximate to 10 3. The Titanium (Ti)can be washed out with the mixture of 4% H 2O 2 and 1mol/L H 2SO 4 and other elements are removed with 0.2 mol/L NaOH solution. Finally,the Sc was extracted inversely by 3.5 mol/L NaOH solution. In this process,the rate of recovery of Sc is nearly 98% and the enrichment factor of Sc is about 1.6×10 3.