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- 학위논문
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- 지도교수
- 이종현
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- 2017
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초록· 키워드
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Pyroprocessing is a highly proliferation-resistant technology for the treatment of spent nuclear fuel (SNF). In the pretreatment step of the pyroprocess, about 2.5 tons of cladding hull wastes are generated on the basis of 10 tons of SNF. The cladding hull wastes are supposedly categorized as an intermediate level waste (ILW) because of a trace amount of SNF residue, fission products, and radioactivation by neutrons.
Because Zirconium (Zr), a major element of cladding hull wastes, is entirely imported from abroad, it is beneficial to recover Zr from cladding hull wastes and to recycle it for nuclear industry applications as well as to reduce the amount of ILWs.
In this study, Zr electrorefining process was demonstrated for the treatment of Zr-alloy cladding hull tube wastes generated from spent nuclear fuel assembly. The addition effects of LiF and AlF3 were investigated to enhance the morphological feature of Zr recovered in LiCl-KCl based molten salts. In the result of examining the electrochemical behaviors and deposition characteristics of Zr in various molten salt systems, LiF addition led to a transition of Zr morphology from a powder to a dendritic structure, thereby reducing the amount of residual salts in the deposit. A heterogenous growth of Zr(Al) metallic plate was verified by the addition of AlF3 in mixed molten salts, which enabled to additionally decrease the residual salt and to increase the current efficiency. We expect that this work will be of help to increase the recovery efficiency of Zr by optimizing the deposition condition for reducing the Al content in the deposit.
Because Zirconium (Zr), a major element of cladding hull wastes, is entirely imported from abroad, it is beneficial to recover Zr from cladding hull wastes and to recycle it for nuclear industry applications as well as to reduce the amount of ILWs.
In this study, Zr electrorefining process was demonstrated for the treatment of Zr-alloy cladding hull tube wastes generated from spent nuclear fuel assembly. The addition effects of LiF and AlF3 were investigated to enhance the morphological feature of Zr recovered in LiCl-KCl based molten salts. In the result of examining the electrochemical behaviors and deposition characteristics of Zr in various molten salt systems, LiF addition led to a transition of Zr morphology from a powder to a dendritic structure, thereby reducing the amount of residual salts in the deposit. A heterogenous growth of Zr(Al) metallic plate was verified by the addition of AlF3 in mixed molten salts, which enabled to additionally decrease the residual salt and to increase the current efficiency. We expect that this work will be of help to increase the recovery efficiency of Zr by optimizing the deposition condition for reducing the Al content in the deposit.
목차
목차 ····································································································ⅠList of Figures ··················································································ⅢList of Table ······················································································Ⅵ1. 서론1.1. 사용후핵연료와 처리 ····························································11.2. 파이로 공정 발생 금속폐기물 ···············································41.3. 폐 피복관 처리 ····································································61.4. 지르코늄 회수기술 ·······························································91.5. 전해정련법 ···········································································121.6. 결정핵의 생성 ······································································142. 실험 방법2.1. 실험장비 및 재료 ·································································173. 결과 및 고찰3.1. 혼합 용융염에서 Zr 산화/환원 거동 ·····································223.2. AlF3 첨가에 따른 Zr의 전기화학 거동 변화 ·························283.3. AlF3 농도에 따른 Zr의 전해정련 특성 ·································313.4. 전착물의 SEM ·····································································363.5. Zirlo 피복관을 양극으로 이용 시 Zr의 전해정련 특성 확인···403.6. 전착 특성 확인 ····································································443.7. 전착물 분석 ·········································································463.7.1. 원소별 분포 및 결정성(SEM-EDX, XRD) ···················463.7.2. 표면특성(XPS) ···························································493.7.3. 정량분석(ICP, IC) ······················································534. 결론 ································································································555. 참고문헌 ·························································································576. 초록 ································································································61
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