Immobilization of radioactive waste by cementation with purified kaolin clay
Immobilization of radioactive waste by cementation with purified kaolin clay
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DOI：
10.1016/s0956-053x(02)00036-3
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发表时间：
2002-01-01
期刊：
影响因子：
8.1
通讯作者：
Osmanlioglu, AE
中科院分区：
文献类型：
--
作者：
Osmanlioglu, AE
研究了水泥-粘土混合物固化低放废物的性能。液态低放射性废物采用化学方法沉淀，然后在桶中固化。使用胶结工艺进行固化。放射性核素的长期浸出率被用作固化废物形式的固定性能的指标。除了评价高岭土对水泥废弃物固化体的浸出性能的影响外，还研究了高岭土的加入对水泥废弃物固化体强度的影响。长期浸出试验表明，水泥中掺入高岭土可显著降低放射性核素的浸出率。然而，超过15重量%的粘土添加物是不合适的。导致胶结废物形式的水解稳定性显著降低。结果表明，当水泥中高岭土含量为5%时，在不损失机械强度的情况下，可获得最佳的垃圾隔离效果。(C)2002爱思唯尔科技有限公司。保留所有权利。
A study is undertaken to determine the waste immobilization performance of low-level wastes in cement-clay mixtures. Liquid low-level wastes are precipitated using chemical methods, followed by solidification in drums. Solidification is done using cementation processes. Long-term leaching rates of the radionuclides are used as indicators of immobilization performance of solidified waste forms. In addition to evaluating the effects of kaolin clay on the leaching properties of the cemented waste forms, the effect of addition of kaolin on the strength of the cemented waste from is also investigated. The long term leaching tests show that inclusion of kaolin in cement reduces the leaching rates of the radionuclides significantly. However, clay additions in excess of 15 wt.% causes a significant decrease in the hydrolytic stability of cemented waste form. It is found that the best waste isolation, without causing a loss in the mechanical strength, is obtained when the kaolin content in cement is 5%. (C) 2002 Elsevier Science Ltd. All rights reserved.