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锆英石对模拟核素Ce⁴⁺的固化能力

Capability of Zircon as Waste Forms for Immobilizing Simulated Actinides With Ce⁴⁺

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【Author】 CUI Chun-long1,2,LU Xi-rui 2,3,ZHANG Dong4,TANG Jing-you3,KANG Hou-jun4, WANG Xiao-li 4,ZHOU Yu-lin5,FENG Qi-ming5 (1.School of Civil Engineering and Architecture,Southwest University of Science and Technology, Mianyang621010,China;2.National Defense Key Discipline Laboratory of Nuclear Waste and Environmental Safety,Southwest University of Science and Technology,Mianyang621010,China; 3.School of National Defense Science and Technology,Southwest University of Science and Technology, Mianyang621010,China;4.China Academy of Engineering Physics,Mianyang621900,China 5.School of Environment and Resource,Southwest University of Science and Technology,Mianyang621010,China)

【机构】西南科技大学土木工程与建筑学院；西南科技大学核废物与环境安全国防重点学科实验室；西南科技大学国防科技学院；中国工程物理研究院核物理与化学研究所；西南科技大学环境与资源学院；

【摘要】为研究锆英石对四价锕系核素的固化能力,利用Ce4+模拟四价锕系核素。以ZrO2、SiO2和CeO2粉体为原料设计了包容量为5%～20%(摩尔分数)的锆英石固化体配方,在1500℃下保温22h进行固化体的制备。利用X射线衍射仪、扫描电子显微镜、红外光谱仪和激光拉曼探针对所制备固化体的物相、结构及微观形貌进行了分析。研究结果表明:在固化体中虽加入了5%～20%的CeO2,但主物相仍以锆英石物相为主,且均具有较高的结晶度,随着CeO2添加量的增加,固化体的无序程度略显增强。更多还原

【Abstract】 In order to investigate the capability of synthetic zircon for immobilization of actinides with tetravalence,Ce4+ was used as the simulacrum for tetravalent actinides, synthesis experiments were heated for 22hunder 1 500℃,designing 5%-20% (mole fraction)dosage of waste forms by using ZrO2,SiO2and CeO2powders as starting materials.The phases,structure and microcosmic shape of synthetic condensates were characterized by the help of X-ray diffraction(XRD),scanning electron microscopy(SEM), infrared absorption spectrum(IR)and laser Raman microprobe(RMP).The results indicate that the major phase of synthesized waste forms gives first place to zircon phase although having added 5%-20%of CeO2in the solidified body.However,they still have good crystallinity.With the enhancing of CeO2in solidified body,the metamict degree of synthesis waste forms is slightly increased.更多还原