THE EXTRACTION OF In (Ⅲ) FROM NITRIC ACID SOLUTION CONTAINING LARGE AMOUNT OF Ag(Ⅰ) WITH HDEHP

The distribution ratio of In(Ⅲ) between organic and aqueous phases in the solvent extraction of In (Ⅲ) with HDEHP is determined.The distribution ratio of In(Ⅲ) decreases as the acidity increases and increases as HDEHP concentrations increase and In(Ⅲ) concentrations decrease.In(Ⅲ) in the organic phase can be back extracted with HC1 of various concentrations. When In(Ⅲ) in the organic phases is back extracted with 1 M hydrochloric acid,the back extraction yield is 90.6±2.3%.The gamma spectrum of 111In separated from irradiated silver target is measured.