Abstract
Sodium zirconium phosphate (NaZr2(PO4)3; NZP) ceramic is a potential nuclear waste immobilization matrix material with the chemical formula MⅠMⅡA2(BO4)3. In this study, a new type of uranium tailing ceramic, Na2Zr2SiP2O12 was prepared using microwave sintering to immobilize uranium tailings. The effects of Na2CO3 doping and sintering temperature on the phase, microstructure, density, and chemical stability of the sintered samples were systematically investigated. The experimental results showed that the samples prepared at 1200 °C exhibited a dense microstructure without element enrichment, and the density of the solidified body reached 2.77 g/cm3. Moreover, the Na2Zr2SiP2O12 ceramic exhibited excellent leaching resistance. Therefore, the preparation of Na2Zr2SiP2O12 ceramics via microwave sintering represents a new method for solidifying uranium tailings.
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