SEPARATION OF PALLADIUM FROM HIGH LEVEL LIQUID WASTE, GENERATED FROM REPROCESSING OF PHWR SPENT FUEL

摘要

The studies carried out show, that both solvent extraction using ABO in solvesso 100 and precipitation methods using 0.1 percent of aqueous solution of Na-DMG can be used, for the separation of Pd from PHWR-HLLW. The methods are simple and rapid. Solvent extraction method does not require feed conditioning with respect to acidity, whereas, precipitation method needs feed acidity below 2 M for better recovery. Under optimized conditions, the recovery of Pd by both the methods is better than 99 percent. Using advantages from both the methods a flow-sheet is proposed for the separation of Pd of desired purity from PHWR-HLLW. The analytical method using absorbance measurement of its thiourea complex is sensitive and can be used for the determination of Pd in HLLW.