RECOVERY OF PALLADIUM FROM BASIC REPROCESSING WASTE OF SPENT NUCLEAR-FUEL

The methods including collection method, extraction-collection method, and special extraction-collection method have been investigated for h igh speed and efficient recovery of palladium from high pH reprocessin g waste of spent nuclear fuel. The equilibrium of the reactions can be obtained in less than 1 minute. The maximum percent recovery of Pd is about 89%, 96% and 97% for collection, extraction-collection, and spe cial extraction-collection methods, respectively. Nearly 100% of back extraction of Pd in the organic phase can be attained by using 7.4 M a mmonia solution with a phase ratio of 1 : 1. The purity of the Pd prod uct is high. The percent recovery of Pd is constant up to 5 . 10(3) Gy of irradiation dose.