Thermal decomposition of the uranyl phosphate mineral phase meta-ankoleite (KUO<sub>2</sub>PO<sub>4</sub>·3H<sub>2</sub>O) has been considered in relation to high temperature thermal sintering for the immobil...
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https://www.riss.kr/link?id=A107109564
2020
English
KCI등재,SCOPUS,ESCI
학술저널
407-414(8쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
Thermal decomposition of the uranyl phosphate mineral phase meta-ankoleite (KUO<sub>2</sub>PO<sub>4</sub>·3H<sub>2</sub>O) has been considered in relation to high temperature thermal sintering for the immobil...
Thermal decomposition of the uranyl phosphate mineral phase meta-ankoleite (KUO<sub>2</sub>PO<sub>4</sub>·3H<sub>2</sub>O) has been considered in relation to high temperature thermal sintering for the immobilisation of a uranyl phosphate containing waste. Meta-ankoleite thermal decomposition was studied across the temperature range 25 - 1200℃ under an inert N<sub>2</sub> atmosphere at 1 atm. It is shown that the meta-ankoleite mineral phase undergoes a double de-hydration event at 56.90 and 125.85℃. Subsequently, synthetically produced pure meta-ankoleite remains stable until at least 1150℃ exhibiting no apparent phase changes. In contrast, when present in a mixed waste the meta-ankoleite phase is not identifiable after thermal treatment indicating incorporation within the bulk waste either as an amorphous phase and/or as uranium oxide. Visual inspection of the waste post thermal treatment showed evidence of self-sintering owing to the presence of glass former materials, namely, silica (SiO<sub>2</sub>) and antimony(V) oxide (Sb<sub>2</sub>O<sub>5</sub>). Therefore, incorporation of the uranium phase into the waste as part of waste sentencing and immobilisation via high temperature sintering for the purpose of long-term disposal is deemed feasible.
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