Properties Of Glass-Bonded Zeolite Monoliths

Corrosion and mechanical properties of zeolite monoliths bonded to nuclear glass waste form were studied for varying hot-pressing parameters. Zeolite A was pretreated with molten LiCl-KCl salt. Then it was mixed with glass frit and hot-pressed at 28, 42, and 56 MPa. MCC-1 tests for 28 days showed that normalised release rates were low and decreased with time. Iodide and Cl-concentrations of the leachates were also low, suggesting that the ion-exchange preoperties of zeolite phase did not affect leach resistance. Leach rates were higher for 42 and 56 MPa hot pressing than for 28 MPa, though porosity was supposed to decrease under higher pressure.