Key Subject Laboratory of National Defense for Radioactive Waste and Environmental Security, Southwest University of Science and Technology, Mianyang 621010, PR China.
Key Subject Laboratory of National Defense for Radioactive Waste and Environmental Security, Southwest University of Science and Technology, Mianyang 621010, PR China; China Academy of Engineering Physics, Mianyang 621900, PR China.
J Hazard Mater. 2017 Sep 5;337:20-26. doi: 10.1016/j.jhazmat.2017.05.003. Epub 2017 May 3.
A rapid and efficient method is particularly necessary in the timely disposal of seriously radioactive contaminated soil. In this paper, a series of simulated radioactive soil waste containing different contents of neodymium oxide (3-25wt.%) has been successfully vitrified by microwave sintering at 1300°C for 30min. The microstructures, morphology, element distribution, density and chemical durability of as obtained vitrified forms have been analyzed. The results show that the amorphous structure, homogeneous element distribution, and regular density improvement are well kept, except slight cracks emerge on the magnified surface for the 25wt.% NdO-containing sample. Moreover, all the vitrified forms exhibit excellent chemical durability, and the leaching rates of Nd are kept as ∼10-10g/(mday) within 42days. This demonstrates a potential application of microwave sintering in radioactive contaminated soil disposal.
在及时处理严重放射性污染土壤方面，特别需要一种快速高效的方法。本文采用微波烧结法，在 1300°C 下烧结 30min，成功地将一系列含有不同氧化钕含量（3-25wt.%）的模拟放射性土壤废物制成了玻璃态。分析了所得玻璃态的微观结构、形貌、元素分布、密度和化学稳定性。结果表明，除了 25wt.%NdO 含量样品的放大表面出现轻微裂缝外，非晶态结构、均匀的元素分布和规则的密度提高都得到了很好的保持。此外，所有的玻璃态都表现出优异的化学稳定性，在 42 天内，Nd 的浸出率保持在约 10-10g/（m·day）。这表明微波烧结在放射性污染土壤处理中有潜在的应用。
