Patent ID: 6214234
Filing Date: 2001-04-10
Classification: B01J,C01C,C01D,C01P,C22B,G21F,Y02P

Abstract:
A method for removal of cesium from an aqueous solution said method comprising the steps:(A) slowly adding an aqueous solution of a hexacyanoferrate salt into a nickel or cobalt salt solution, the concentration of the nickel or cobalt salt solution being at least 0.35 mols per liter, and stirring the mixture at ambient temperature during this addition, to provide a nickel or cobalt hexacyanoferrate having a fraction of exchangeable nickel or cobalt smaller than 35%;(B) separating and recovering the resulting hexacyanoferrate precipitate from the mixture to provide a solid-state hexacyanoferrate compound;(C) contacting the cesium-containing aqueous solution with said solid-state hexacyanoferrate compound for binding cesium to the hexacyanoferrate; and(D) separating the aqueous solution of reduced cesium content from the hexacyanoferrate.