Surface interfacial analysis of simulant high level nuclear waste glass dissolved in synthetic cement solutions
Surface interfacial analysis of simulant high level nuclear waste glass dissolved in synthetic cement solutions
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DOI：
10.1038/s41529-022-00279-5
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发表时间：
2022-08
影响因子：
5.1
通讯作者：
C. Corkhill;Colleen Mann;Jeremy R. Eskelsen;D. Leonard;L. Mottram;M. Stennett;Jennifer M. S. Ayling;Clare L. Thorpe-;M. Cole;S. Nicholas;R. Tappero;E. Pierce
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文献类型：
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作者：
C. Corkhill;Colleen Mann;Jeremy R. Eskelsen;D. Leonard;L. Mottram;M. Stennett;Jennifer M. S. Ayling;Clare L. Thorpe-;M. Cole;S. Nicholas;R. Tappero;E. Pierce
研究了模拟英国高放废物（CaZn 28）的富镁碱金属铝硼硅酸盐玻璃在合成水泥溶液中的腐蚀机理和动力学。溶解度随每种水泥溶液的不同pH值和碱/碱土含量而变化。高分辨率显微镜和光谱技术确定了玻璃和水泥溶液之间的界面的性质。TEM-EDS显示富含碱金属和碱土金属的硅胶，其中K、Ca和Mg被掺入。TEM-SAED结合同步辐射微焦点XRD，确定除了针铁矿（FeOOH）和结晶二氧化硅之外，镁铝酸盐层状双氢氧化物相、镁铝石（Mg 6Al 2（OH）18·4 H2O）的普遍沉淀。C-S-H相，雪硅钙石（Ca 5Si 6 O 16（OH）2·4 H2O），仅在大多数富钙溶液中被鉴定。这些数据提供洞察力的作用，碱金属/碱土金属丰富的解决方案中的溶解或放射性废物玻璃，重要的是在地质处置设施的最终处置。
The corrosion mechanisms and kinetics of a Mg-rich alkali aluminoborosilicate glass simulating UK high-level waste (CaZn28) were investigated upon dissolution in synthetic cement solutions. Dissolution varied as a function the different pH and alkali/alkaline earth content of each cement solution. High resolution microscopy and spectroscopy techniques ascertained the nature of the interface between the glass and the cement solutions. TEM-EDS revealed alkali- and alkaline earth-rich silica gels, into which K, Ca and Mg were incorporated. TEM-SAED, combined with synchrotron micro-focus XRD, identified the ubiquitous precipitation of the Mg-aluminate layered double hydroxide phase, meixnerite (Mg6Al2(OH)18·4H2O), in addition to goethite (FeOOH) and crystalline silica. The C-S-H phase, tobermorite (Ca5Si6O16(OH)2·4H2O), was identified in the most Ca-rich solution only. These data give insight to the role of alkali/alkaline earth-rich solutions in the dissolution or radioactive waste glasses, of importance to the final disposition in a geological disposal facility.