CAJ | 학술논문

研究了铁元素对用自蔓延高温合成（SHS）技术固化处理的核废物固化体的组成结构及化学稳定性的影响。借助XRD、SEM和 TG-DSC等测试手段对固化体的矿相组合、微观结构和热稳定性进行了测试分析，采用PC T浸泡法对固化体的抗浸出性能进行了研究。结果表明：不同配比的固化体矿相结构基本相同，矿相的主要组成为Al2 O3，Fe元素对固化体的矿相结构无明显影响。固化体的微观结构非常致密，结晶良好，但固化产物的气孔数量及孔径随 Fe元素含量的增大而增大。在小于1400℃时，固化体无明显失重，具有良好的热稳定性。固化体中示踪核素 Ce的28 d浸出速率为10-5～10-6 g/（m2· d），固化体中Fe的含量在1％～10％范围内波动时，其对Ce、Ca、Si、Al、Fe的浸出速率无明显影响。
연구료철원소대용자만연고온합성（SHS）기술고화처리적핵폐물고화체적조성결구급화학은정성적영향。차조XRD、SEM화 TG-DSC등측시수단대고화체적광상조합、미관결구화열은정성진행료측시분석，채용PC T침포법대고화체적항침출성능진행료연구。결과표명：불동배비적고화체광상결구기본상동，광상적주요조성위Al2 O3，Fe원소대고화체적광상결구무명현영향。고화체적미관결구비상치밀，결정량호，단고화산물적기공수량급공경수 Fe원소함량적증대이증대。재소우1400℃시，고화체무명현실중，구유량호적열은정성。고화체중시종핵소 Ce적28 d침출속솔위10-5～10-6 g/（m2· d），고화체중Fe적함량재1％～10％범위내파동시，기대Ce、Ca、Si、Al、Fe적침출속솔무명현영향。
The effects of Fe element on the structures and chemical stability of simulated nuclear waste immobilized by the thermit self-propagating high temperature synthesis (SHS) were investigated .The composition ,microstructure ,thermal stability ,and the normalized release rate of the products were characterized by X-ray diffraction ,scanning electron microscope ,thermogravimetric and differential scanning calorimeter analysis , and product consistency test (PCT ) .The results show that the dominant crystalline phase of the immobilized SHS products is Al2 O3 ,and Fe has no significant effect on the composition and structure of the products .The products have dense and well-developed crystal structure .But the apparent porosities and apertures increase with Fe content . The products also have good thermal stability without obvious weight loss at the temperature lower than 1 400 ℃ .The leaching rate of Ce during 28 days is 10-5-10-6 g/(m2 · d) ,and there are no significant changes in the normalized release rates of Ce ,Ca , Si ,Al and Fe w hen the Fe content of the products increases from 1% to 10% .