Goñi S, Guerrero A, Lorenzo M P
Instituto de Ciencias de la Construcción Eduardo Torroja, CSIC, C/Serrano Galvache, 4, 28033 Madrid, Spain.
J Hazard Mater. 2006 Oct 11;137(3):1608-17. doi: 10.1016/j.jhazmat.2006.04.059. Epub 2006 May 7.
The efficiency of innovative matrices for immobilizing cesium is presented in this work. The matrix formulation included the use of fly ash belite cement (FABC-2-W) and gismondine-type Na-P1 zeolite, both of which are synthesized from fly ash of coal combustion. The efficiency for immobilizing cesium is evaluated from the leaching test ANSI/ANS 16.1-1986 at the temperature of 40 degrees C, from which the apparent diffusion coefficient of cesium is obtained. Matrices with 100% of FABC-2-W are used as a reference. The integrity of matrices is evaluated by porosity and pore-size distribution from mercury intrusion porosimetry, X-ray diffraction and nitrogen adsorption analyses. Both matrices can be classified as good solidify systems for cesium, specially the FABC-2-W/zeolite matrix in which the replacement of 50% of belite cement by the gismondine-type Na-P1 zeolite caused a decrease of two orders of magnitude of cesium mean Effective Diffusion Coefficient (D(e)) (2.8e-09 cm(2)/s versus 2.2e-07 cm(2)/s, for FABC-2-W/zeolite and FABC-2-W matrices, respectively).
本文介绍了用于固定铯的创新型基质的效率。基质配方包括使用粉煤灰贝利特水泥（FABC - 2 - W）和钙霞石型Na - P1沸石，二者均由煤燃烧产生的粉煤灰合成。通过在40℃温度下按照ANSI/ANS 16.1 - 1986浸出试验来评估固定铯的效率，从中获得铯的表观扩散系数。以100%的FABC - 2 - W基质作为参考。通过压汞法、X射线衍射和氮吸附分析来根据孔隙率和孔径分布评估基质的完整性。两种基质都可归类为铯的良好固化体系，特别是FABC - 2 - W/沸石基质，其中用钙霞石型Na - P1沸石替代50%的贝利特水泥使铯的平均有效扩散系数（D(e)）降低了两个数量级（FABC - 2 - W/沸石基质和FABC - 2 - W基质的D(e)分别为2.8e - 09 cm²/s和2.2e - 07 cm²/s）。
