Ion exchange of several radionuclides on the hydrous crystalline silicotitanate, UOP IONSIV IE-911

The crystalline silicotitanate, UOP IONSIV IE-911, is a proven material for removing radionuclides from a wide variety of waste streams. It is superio r for removing several radionuclides from the highly alkaline solutions typ ical of DOE wastes. Our laboratory previously developed an equilibrium mode l applicable to complex solutions for IE-910 (the powder form of the granul ar IE-911), and more recently, we have developed several single component i on-exchange kinetic models for predicting column breakthrough curves and ba tch reactor concentration histories. In this paper, we model ion-exchange c olumn performance using effective diffusivities determined from batch kinet ic experiments. This technique is preferable because the batch experiments are easier, faster, and cheaper to perform than column experiments. We also extend these ideas to multicomponent systems. Finally, we evaluate the abi lity of our equilibrium model to predict data for IE-911.