模拟高盐、高碱中低放废液水泥固化体的浸出性能

针对高盐、高碱中低水平放射性废液的特性，研究了掺合料的种类、掺量对水泥固化体Sr^2＋，Cs^＋的浸出性能的影响。结果表明，矿渣和粉煤灰同时掺入，对降低Sr^2＋的浸出率较为明显；沸石、凹凸棒石的掺入，对降低Cs^＋的浸出率显著。当硅酸盐水泥：矿渣：粉煤灰：沸石：凹凸棒石=4：2：2：1：1时，42dCs^＋的累积浸出率仅为未含掺合料时的15．2％。浸出液的电导率表明，矿渣、粉煤灰、沸石、凹凸棒石的掺入对废液中的可溶性盐固化有利。用掺有矿渣、粉煤灰、沸石、凹凸棒石的硅酸盐水泥固化模拟高盐、高碱中低水平放射性废液时，固化体中Sr^2＋，Cs^＋的浸出率可以满足GB14569．1—2011的要求。

Study on Leaching Behavior of Cement Solidified Forms Containing Simulated High Salt and Alkali-Loaded Low and Intermediate Level Radioactive Liquid Waste

The influence of the addition of mineral admixtures on the leaching behavior of Sr^2 ＋ and Cs ^＋ in cement solidified forms containing simulated high salt and alkali-loaded low and intermediate level radioactive liquid waste was investigated. The results show that the addition ofboth slag and fly-ash can reduce the leach rate of Sr^2 ＋ , while the addition of zeolite and attapulgite can reduce the leach rate of Cs ^＋ obviously. The cumulative leach rate of Cs ^＋ in the solidified form with cement ： slag ： fly-ash ： zeolite ： attapulgite in the ratio of 4 ： 2 ： 2 ： 1 ： 1 is 15.2% of that in Portland Cement after leaching for 42 d. Furthermore, the addition of slag, fly-ash, zeolite, and attapulgite facilitates modified the solidification of dissoluble salts. The leach rates of Sr^2＋ and Cs^＋ in the above mineral admixtures-modified Portland cement solidified forms can satisfy the requirements of GB14569.1 -2011.