Extraction/separation method

摘要

The inventive extraction/separation method involves the 5 step of contacting an organic phase containing a dialkyldiglycol amic acid extractant: R'R2NCOCH20CH 2COOH with an aqueous solution containing scandium and zirconium and/or hafnium for thereby extracting zirconium and/or hafnium into the organic phase. The purity of scandium can be efficiently 10 increased by the simple step of solvent extraction. oo AsO r~ -% %a coL--Lt Co oplowir