SEPARATIONS AND RECOVERY OF URANIUM, THORIUM AND LANTHANIDES FROM MONAZITE USING CYANEX 923

摘要

The extraction behaviour of uranium, thorium and lanthanides, represented by cerium and ytterbium, has been investigated in Cyanex 923. Effect of different variables like the concentration of acids, metal ion and extractant, nature of diluent and temperature has been studied. The composition of the extracted U(Ⅵ) and Th(Ⅳ) species has been proposed. Based on the partition data some important ternary separations involving the aforesaid metal ions have been achieved. The proposed procedure has been applied for the recovery of uranium, thorium and lanthanide fraction from monazite sand. Stability and regeneration capacity of the extractant have been evaluated.