期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 239, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2019.122314
关键词
Sustainable materials; Phosphate glass ceramic; Immobilization; Nuclear waste; Aqueous dissolution rate
资金
- National Natural Science Foundation of China [51702268]
- China Industrial Technology Development Program [2017-1407]
50 wt% of the simulated nuclear waste derived from the high level waste (HLW) in China is immobilized by using titanium-doped iron phosphate based glass ceramics. The effect of TiO2 content on the crystalline phases, structure and aqueous dissolution rate of the glass ceramic waste forms was investigated in detail. The results show that the crystalline phases of the obtained waste forms are monazite (Ce, La)PO4 accompanying with a small concentration of zirconium pyrophosphate ZrP2O7. The crystallization of ZrP2O7 phase is suppressed by adding TiO2 in the phosphate baseline glasses. Meanwhile, smaller grain size of the products is obtained. Moreover, the aqueous dissolution rates of the glass ceramic waste forms keep in the order of magnitude of 10(-2) g m(-2) d(-1) after 14 leaching days, indicating their good chemical durability which are comparable to widely used borosilicate glasses and iron phosphate glasses/waste forms. The conclusions suggest that phosphate-based glass ceramics may potentially be an applicable matrix for the disposal of HLWs which are rich in actinide elements.
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