Journal of the Korean Industrial and Engineering Chemistry, Vol.12, No.5, 528-532, August, 2001
기체-고체 반응에 의한 지르코늄의 불소화
Fluorination of Zirconium by Gas-solid Reaction
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초록
사용후핵연료 내에는 반감기가 매우 긴 장수명 핵종들이 존재하며, 이를 장기간 보관하는 과정의 안전성 향상을 위해 장수명 핵종들을 분리하여 소멸처리로에서 단반감기 또는 안정 핵종으로 변환시키는 개념이 개발되어 있다. 본 연구에서는 소멸처리로 연료 제조공정중의 하나인 불소화 특성을 조사하기 위하여 지르코늄 금속을 선정하고, 기-고 반응법을 이용하여 지르코늄 금속과 불화수소 기체를 반응시켰다. 기-고 반응법은 지르코늄의 불소화에 효과적이었으며, 전환률은 온도의 증가에 따라 그리고 불화수소 농도의 증가에 따라 커졌다. 여러 가지 기-고 반응 모델중 3차원 diffusion-controlled model이 가장 적합하였다. 이 모델을 이용하여 완전 불소화 시키는데 1 mm 입자의 경우 11 h, 그리고 10 mm 입자의 경우에는 1140 h이 소요될 것으로 예측되었고, 활성화 에너지는 56 kJ/mole로 계산되었다.
Technology on the transmutation of nuclear waste has been developed to reduce the long-term risks during the storage of long-lived radioactive nuclides. In this work the fluorination of irconium was studied to investigate the preparation of fuel for the transmutation reactor. Zirconium was hydrofluorinated by a gas-solid reaction method. It was found that the gas-solid reaction method was effective for the fluorination of zirconium. The fractional conversion increased with increasing mole fraction of hydrogen fluoride and reaction temperature. Among various gas-solid reaction models, 3-dimensional diffusion-controlled model was most suitable for the reaction. From the model, it to calculated that 11 and 1140 hours are required to fluorinate the zirconium sphere of 1 and 10 mm diameter, respectively. The activation energy of the hydrofluorination reaction was 56 kJ/more.
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