Immobilization of Barium, Cadmium and Antimony Cations Over Zirconia
Immobilization of Barium, Cadmium and Antimony Cations Over Zirconia
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DOI：
10.3327/jnst.28.1014
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发表时间：
1991-11
影响因子：
1.2
通讯作者：
D. Bhattacharyya;N. C. Dutta
中科院分区：
文献类型：
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作者：
D. Bhattacharyya;N. C. Dutta
为了满足高放废物安全处置的要求，研究了新制备的水热稳定致密型氧化锆对Ba、Cd和Sb的固定化作用。对含水氧化锆在70℃干燥24 h后对Ba、Cd和Sb的吸附进行了示踪研究，发现其对140Ba（95.69%）、115Cd（99.43%）和125Sb（95.18%）的吸附率很高。Ba、Cd和Sb阳离子分别随氢氧化锆析出，吸附量分别为46.5w/0的Ba、58 w/0的Cd和53.0 w/0的Sb。在1200℃下煅烧20 h后，在97℃下每24 h进行索氏浸出试验，连续7天，阳离子的释放量为10−7 g.cm−2·d−1。采用氮气吸附BET法测定固定化剂球团的比表面积。本文还获得了含Ba、Cd和Sb的氧化锆样品的x射线衍射图。
In order to meet up the requirement for the safe disposal of high level radioactive waste, immobilization of Ba, Cd and Sb over the freshly prepared hydrothermally stable and dense type zirconium oxide is studied. Investigation about the adsorption of Ba, Cd and Sb at tracer level was undertaken with the hydrous zirconia, dried at 70°C for 24 h, and very high uptakes of 140Ba (95.69%), 115Cd (99.43%) and 125Sb (95.18) were observed. Weighable quantities of Ba, Cd and Sb cations were separately precipitated alongwith zirconium-hydroxide and 46.5w/0 for Ba, 58 w/0 for Cd and 53.0 w/0 for Sb were adsorbed respectively. After calcining the mixed mass in pellet form at 1,200°C for 20 h, soxhlet leach test at 97°C in every 24 h for 7 days showed the release of cations in the order of 10−7 g.cm−2·d−1. Surface area of the immobilizer pellet was determined by N2 gas adsorption BET method. X-ray diffraction patterns have been also obtained for each of the zirconia samples accommodated with Ba, Cd and Sb, and distin...