I&EC 34 |
| Ping Na, Linshuang Wang, Yan Sun, and Rongshu Wang. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China |
| Radium is one of the most dangerous radionuclides released to the biosphere from the radioactive wastes repository and the nuclear fuel cycle. The effective removal of radium from waste solutions is feasible by means of adsorption on environmental mineral materials such as barite, celestite, strontianite, ilmenite, zircon, pyrolusite, diatomaceous earth, kaolinite, montmorllonite, spodumene, hematite and maifanshih. The distribution coefficient Kd indicates the ability of environmental mineral materials adsorbing Ra2+ in water in a certain condition. The Kd of different environmental mineral materials varied from 242 to 3815 respectively. The experiments were conducted at constant temperature and the samples with particle size 100-200 mesh were impregnated in the simulated waste solution with 5037 pCi/dm3 for 24 hours. Maifanshih is a more superior radium removal adsorbent and highly effective retarding barrier material in radium repositories, which Kd value is 3815. The isotherm and the adsorption mechanism of radium adsorption are also discussed. |
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Advanced Technologies for Decontaminating and Managing Radioactive Wastes
1:30 PM-4:20 PM, Sunday, March 28, 2004 Marriott -- Orange County 2, Oral
Division of Industrial and Engineering Chemistry |