Pellets made of pure sodalite blended with commercial glass frit and pellets made
of sodalite, glass frit and a mixture of chloride salts, synthesized through dry
pressing and subsequent thermal treatment, were evaluated as a potential matrix
for confinement of spent chloride salts coming from pyroprocesses. The sodalite
pellets were leached at 23°C and 90°C for 28 days, according
to the ASTM C1220-10 procedure. Normalized release rates were estimated for the
following elements: Li, Na, Al, Si, K, Rb, Cs, Sr, Ba, La, Nd and compared with
literature results. SEM investigations, carried out before and after the
leaching tests, show dissolution and re-precipitation phenomena at
90°C.