Abstract: A method for removal of cesium from aqueous solution, particularly from nuclear waste liquids. The cesium-containing aqueous solution is contacted with a solid-state hexacyanoferrate compound of a transition element for binding cesium to the hexacyanoferrate. The aqueous solution of reduced cesium content is separated from the hexacyanoferrate. Preferably, a nickel or cobalt hexacyanoferrate is utilized having a fraction of exchangeable transition elements smaller than 35 %. The hexacyanoferrate compound of said transition element may be produced by slowly adding an aqueous solution of the hexacyanoferrate into the transition element salt solution, the concentration of the transition element salt solution being at least 0.35 mol/l, stirring the mixture at ambient temperature during the addition, and separating and recovering the resulting hexacyanoferrate precipitate from the mixture.

Abstract: A titanate ion exchanger and method of producing same. Solid hydrous titanium oxide in a slurry is reacted with an alkaline agent, such as NaOH, containing an exchangeable cation. A solids fraction containing the titanate product is settled and separated and a granular titanate ion exchanger product recovered from the solids fraction. The ion exchanger is suitable for the separation of radionuclides, such as those containing radioactive strontium, from nuclear waste solutions.