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Simple and rapid preparation of granite-based waste form by laser sintering
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DOI：10.1142/S1793604726510112.png)
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Abstract
En 中文
In this paper, laser sintering technology is used for the first time to fabricate natural granite-based waste forms. Under different sintering powers (190W, 240W, and 270W) and sintering times (10min, 20min, and 30min), vitrified bulks derived from natural granite were fabricated. Based on this, simulated nuclear waste containing Cs was further immobilized by granite at 190W. The phase, micromorphology and mechanical properties of the sintered specimens were characterized, and the results indicated that within the studied range, Cs could be immobilized by the glass network and by forming Cs(AlSi2O6). FT-IR results show that the samples prepared by laser sintering have a proper network structure to encapsulate waste elements. Furthermore, hardness and density measurements showed that the waste forms incorporating the waste exhibited considerable mechanical properties. The process condition 190W 30min was considered as the optimal sintering condition for solidifying granite based Cs containing waste. Chemical stability tests were conducted on the samples fabricated via this process. The 14-day normalized leaching rate of Cs reached similar to 10(-4)g & sdot;m(-2)& sdot;d(-1). This indicates that the waste forms prepared by laser sintering exhibit feasibility.
Keywords:
Laser sintering
Granite
Cesium
Immobilization
Cs(AlSi2O6)
Laser sintering
Granite
Cesium
Immobilization
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