Leaching Stability of Simulated Waste Forms for Immobilizing An3+ by Gd2Zr2O7 with Nd3+
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2014年第5期
论文作者：卢喜瑞 CHEN Mengjun DONG Faqin WANG Xiaoli WU Yanlin XIAO Zhengxue
文章页码：885 - 890
摘 要：In order to investigate the anti-leaching capability of pyrochlore Gd2Zr2O7 immobilized An3+, trivalent neodymium was used as the simulacrums for radioactive wastes with trivalence, Gd2-xNdxZr2O7（0.0x 2.0） series samples were successfully synthesized by high temperature solid reaction and using Gd2O3, Zr O2 powders as starting materials. The experiments of long-term chemical stability were conducted in synthetic seawater at 40 and 70 ℃. The XRD diffractive data and extraction ratio of as-received samples were collected with the help of X-ray diffraction（XRD） instrument and inductively coupled plasma mass spectrometry（ICPMass）. The results indicate that the phases of as-received compounds keep the single phase of pyrochlore. The extraction ratio of Gd3+, Zr4+ and Nd3+ in waste forms is increasing with the increase of immersion time in synthetic seawater. The extraction ratio of waste forms at 70 ℃ is higher than at 40 ℃. The highest extraction ratio of Gd3+, Zr4+ and Nd3+ after 42 days is near 0.025 8, 0.003 8 and 0.045 2 μg·m L-1, respectively.
卢喜瑞1,2，CHEN Mengjun1，DONG Faqin1，WANG Xiaoli3，WU Yanlin4，XIAO Zhengxue1
1. Key Subject Laboratory of National Defense for Radioactive Waste and Environmental Security, Southwest University of Science and Technology2. Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education,Institute of Nuclear Science and Technology, Sichuan University3. Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics4. School of High Energy Accelerator Science, Graduate University for Advanced Studies
摘 要：In order to investigate the anti-leaching capability of pyrochlore Gd2Zr2O7 immobilized An3+, trivalent neodymium was used as the simulacrums for radioactive wastes with trivalence, Gd2-xNdxZr2O7（0.0x 2.0） series samples were successfully synthesized by high temperature solid reaction and using Gd2O3, Zr O2 powders as starting materials. The experiments of long-term chemical stability were conducted in synthetic seawater at 40 and 70 ℃. The XRD diffractive data and extraction ratio of as-received samples were collected with the help of X-ray diffraction（XRD） instrument and inductively coupled plasma mass spectrometry（ICPMass）. The results indicate that the phases of as-received compounds keep the single phase of pyrochlore. The extraction ratio of Gd3+, Zr4+ and Nd3+ in waste forms is increasing with the increase of immersion time in synthetic seawater. The extraction ratio of waste forms at 70 ℃ is higher than at 40 ℃. The highest extraction ratio of Gd3+, Zr4+ and Nd3+ after 42 days is near 0.025 8, 0.003 8 and 0.045 2 μg·m L-1, respectively.
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