Abstract
ABSTRACTA natural magmatic granite rock has been explored as a host matrix for nuclear waste disposal. The blank granite, in the form of a powder, was treated by microwaves in the temperature range 800°C to 1200°C. It was found that the amount of amorphous phase increased markedly with increasing temperature, which is promoted by the decomposing of feldspar (Na,KAlSi3O8) during the formation of a glassy network. Moreover, 16 wt.% of simulated nuclear waste, Nd2O3, could be successfully immobilised within the natural granite at a temperature of 1000°C. Nd3+ was found to exist both in the crystalline structure (as Nd2Si2O7) and in the bulk glass. This method of treating nuclear waste is simple and environmental friendly.
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