Abstract
The Nd3+-basaltic glass was prepared by melt-heat treatment method using Nd3+ to simulate trivalent actinides. The structure, thermal stability and leaching characteristics of basaltic glass with different contents of Nd2O3 were investigated. XRD and SEM-EDX results show that the simulated waste loading of Nd2O3 in basaltic glass can be up to ∼30 wt.%, and oxy-silicate apatite (Ca2Nd8(SiO4)6O2) precipitates when Nd2O3 content reaches 32 wt.%. Raman results indicate that the addition of Nd2O3 breaks some of Si-O-Si bond, but overall there is not much effect on the glass network structure. DSC results show the Tg of the glasses increases and the thermal stability first increases and then decreases with the increase of Nd2O3 content. The leaching resistance of samples was evaluated by the ASTM Product Consistency Test (PCT) Method, which shows that all the samples have good leaching resistance. Among them, the standard mass loss of Na is the greatest after 28 days. The NLNd is 4∼5 orders of magnitude lower than other elements.
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