Improvement of Cs leaching resistance of solidified radwastes with copper ferrocyanide (CFC)-vermiculite |
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| Institution: | 1. Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, TX;2. Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX;3. Department of Neuroscience, Baylor College of Medicine, Houston, TX;4. Department of Radiology, Baylor College of Medicine, Houston, TX;5. Department of Pediatrics, Baylor College of Medicine, Houston, TX;6. Department of Critical Care Medicine, Baylor College of Medicine, Houston, TX;7. Small Animal Imaging Facility, Texas Children''s Hospital, Houston, TX;8. US Department of Agriculture/Agricultural Research Service Children''s Nutrition Research Center, Houston, TX;9. Bruker Corp, Houston, TX;1. Decommissioning Technology Research Division, Korea Atomic Energy Research Institute, 989-111 Daedukdaero, Yuseong, Daejeon, 34057, South Korea;2. Dept. of Chemistry, Sungkyunkwan University, Suwon, Kyeonggi-do, South Korea;1. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, PR China;2. Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, Harbin, 150001, PR China;1. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, PR China;2. Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, Harbin, 150001, PR China;3. School of Materials Science and Engineering, Harbin Institute of Technology, Weihai, 264209, PR China;4. Beijing Building Materials Testing Academy Co., Ltd., Beijing, 100041, PR China;1. Hubei Key Laboratory of Critical Zone Evolution, School of Earth Science, China University of Geosciences, Wuhan, 430074, China;2. Department of Resources Science and Engineering, Faculty of Earth Resources, China University of Geosciences, Wuhan, 430074, China;3. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, School of Geosciences and Info-Physics, Central South University, Changsha, 410083, China;4. Laboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1-N1-16 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan |
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| Abstract: | Cesium removal from de-ionized water, seawater, and limewater using copper ferrocyanide (CFC) and porous media including silica gel, bentonite, vermiculite, and zeolite as adsorbents were investigated; CFC was incorporated with vermiculite to prepare a compound adsorbent for improving the Cs-leaching resistance of solidified borate radwastes. It was shown that the Cs-removal efficiency by CFC, defined as the percentage of cesium removed or adsorpted from solution, was largely affected by pHs of the solutions. Good removal efficiency occurred at pHs ranging from 3 to 12 with the best from 7 to 10. Vermiculite and zeolite were shown to have better removal power than silica gel and bentonite, and vermiculite was chosen to incorporate with CFC to make compound adsorbents because of its good compatibility with CFC floc. Compound adsorbents with different CFC contents were used as additives in the solidification of radioactive borate wastes for improving the cesium leaching resistance of the solidified products. Experimental results showed that the cesium leachability index measured following the method described in ANSI/ANS 16.1 increased from 7.96 to 9.76 by adding 0.25% of a compound adsorbent containing 20% CFC and 80% vermiculite. It indicated that the compound adsorbent is very useful for improving cesium-leaching resistance of the solidified borate wastes. |
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