Extraction of Scandium from Various Media with Triisoamyl Phosphate: 1. Extraction of Sc and Impurity Metals from Aqueous Nitric Acid Solutions

• DOI: 10.1007/s11137-005-0069-7
• Publication Date: 2005-06-15T13:25:46Z
• Authors: G. V. Kostikova; N. A. Danilov; Yu. S. Krylov; G. V. Korpusov; E. V. Sal’nikova
• Keywords: Nitric acid; Scandium; Aqueous two-phase system; Dodecane; Salting out

The main features of extraction of Sc from aqueous nitric acid solutions with triisoamyl phosphate (TIAP) were studied. It was shown that Sc passes into the organic phase in the form of Sc(NO3)3·3TIAP. The extraction isotherms of Sc from its aqueous HNO3 solutions and from those containing salting-out agents (LiNO3, NH4NO3) with TIAP in dodecane were obtained. The distribution factor of Sc was studied in relation to the concentrations of TIAP, salting-out agent, and HNO3. The extraction of Sc and impurity metals (Zr, Th, REE) with TIAP was studied at widely varied HNO3 concentration in the aqueous phase. The separation factors of Sc from impurity metals were determined.