LAUSR

Abstract Zirconolite-rich composite material was rapidly obtained from combustion synthesis (CS) using CuO as the oxidant and Ti as the reductant. As the surrogate of trivalent actinides, Nd was incorporated to substitute the Ca site of zirconolite with Al 2 O 3 as the charge compensator. The results demonstrate that Nd-bearing calcium zirconium titanium oxide (CZTO) was produced as the main phase after Nd 2 O 3 and Al 2 O 3 addition. Nd 2 O 3 was consolidated into the lattice structure of zirconolite-rich waste forms with waste loading of about 20 wt%. The 42 days normalized leaching rates (LR i ) of Cu, Ca and Nd in the tested CNA-3 sample were evaluated to be 1.98×10 −2 , 7.36×10 −2 and 6.35×10 −5 g m −2 ·d −1 .