Nuclear Waste Disposal

Ojovan, Michael I.

doi:10.3390/encyclopedia3020028

Cited by 4 publications

(1 citation statement)

References 11 publications

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“…However, the development and utilization of nuclear technology, while yielding economic and societal benefits, also entail the inherent risk of nuclear accidents [2,3]. One such hazard involves the presence of 90 Sr, a prominent constituent found in spent nuclear fuel, high-level liquid waste (HLLW) resulting from spent nuclear fuel reprocessing, and other waste materials generated during reactor operation [4,5]. In waste, 90 Sr typically exists in ionic form and demonstrates strong migration capabilities in water [6].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Cancrinite from Coal Gangue for the Immobilization of Sr

Wang,

Zhang,

Ang

et al. 2024

Materials

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The primary objective of this study is to investigate and develop a rapid and effective method for the immobilization of Sr in the event of a nuclear leakage incident. Coal gangue, an underutilized form of solid waste from the coal industry, can be used as a raw material for curing Sr due to its high content of silica–alumina oxides. In the present study, Sr was successfully solidified in cancrinite synthesized using a hydrothermal method with coal gangue as raw material. A stable cancrinite phase was formed at a relative alkali concentration of more than 6 M. When the Sr/Al(Si) ratio was <1/6, cancrinite was the only stable phase that varied with the hydrothermal temperature and time. When the Sr/Al(Si) ratio increased to 1/2, the cancrinite phase completely disappeared, and a new strontium feldspar phase (SrAl2Si2O8) appeared. PCT leaching experiments showed that when Sr/Al(Si) < 1/6, the Sr leaching rate of Sr-cancrinite samples obtained by hydrothermal synthesis at 180 °C for 24 h was very low.

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