The safe treatment of radionuclide-contaminated soil in uranium tailings is of critical importance. In this work, neodymium- and cerium-contaminated soil in uranium tailings were successfully immobilized via mi-crowave sintering to form glasses with the addition of Na2CO3. The phase evolution and chemical durabil-ity of the as-prepared vitrified forms were systematically investigated using various spectroscopic and microscopic techniques. The results indicated that Nd and Ce could be fixed in glass structures, and the ultimate solid solubility of Nd and Ce reached 15 and 5 wt.%, respectively, with 20 wt.% Na2CO3 added. These samples were sintered at 1200 оС for 40 min, and the solidified samples exhibited homogeneous elemental distribution. Moreover, the sintered matrices exhibited excellent chemical durability. The normalized leaching rates of Ce and Nd after 42 days were maintained at low values (~10–6 – 10–7 gm–2 d–1)
Min Chen1, Keyou Shi1, Qiucai Zhang1, Shoufu Yu1, Jiawei Li1, Zengming Tang1, Ailian Zhu1, Wei Wei1, Min Fu1, Xiangyang Li1, 2, Yupeng Xie1, 2, Yong Liu1, 2 1School of Resource Environment and Safety Engineering, University of South China, Hengyang, Hunan, 421001, PR China 2Decommissioning Engineering Technology Research Center of Hunan Province Uranium Tailings Reservoir, University of South China, Hengyang, 421001, PR China
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