Patent ID: 6843921
Filing Date: 2005-01-18
Classification: B01D,B01J,G21F

Abstract:
1. A method of separation and recovery of elements from radioactive liquid wastes, comprising: a first absorption step of bringing into contact a high-level radioactive liquid waste containing separation target elements including Americium, Curium, Zirconium, Molybdenum, Palladium and rare earth elements with a solid absorbent containing organophosphorus compounds so that the separation target elements are absorbed in the solid absorbent; a first elution step of bringing into contact the solid absorbent with an acidic solution containing diethylenetriaminepentaacetic acid so that Americium, Curium, Zirconium, Molybdenum, Palladium and heavy rare earth elements are eluted from the solid absorbent; and a second elution step of bringing into contact the solid absorbent underwent the first elution step with water or dilute nitric acid so that light rare earth elements are eluted from the solid absorbent.