黑曜石的腐蚀机理及其与核废料玻璃长期性能评价的比较

N. Rani, J. Shrivastava, R. Bajpai
{"title":"黑曜石的腐蚀机理及其与核废料玻璃长期性能评价的比较","authors":"N. Rani, J. Shrivastava, R. Bajpai","doi":"10.2174/1876503301003010016","DOIUrl":null,"url":null,"abstract":"Present paper discusses experimental work on obsidian glass to understand corrosion mechanism at variable pressure temperature conditions. For comparison, Advanced Vitrification System, a nuclear waste glass was studied simultaneously under similar conditions. Owing to massive weight loss the glass samples were unable to sustain beyond 4 hour during the experiments. Corrosion experiments on both these glasses were performed under hydrothermal like conditions and observed that the changes in the experimental conditions have major control over the release of sodium and other ions from obsidian and nuclear waste glass, hence effecting corrosion mechanism. X-ray diffraction patterns of the residue obtained after the experiments on obsidian glass revealed appearance of neo-formed minerals, such as quartz, celadonite, halloysite, sodalite, heulandites and wairakite. High degree of corrosion and formation of amorphous residue observed in case of the experiments performed at 300 0 C over the granules of the nuclear waste glass. The back scattered electron images of the scanning electron microscope indicate distinctive microstructures, associated with the neo-formed minerals, and their formation is linked with the release of sodium, potassium and other ions, causing changes in the pH and conductivity of the leachate. In case of nuclear waste glass back scattered images of the scanning electron microscope indicates formation of multiple alteration layers and secondary alteration products. The surface of the pellet after the experiment shows phyllosilicate with numerous tiny spherules embedded within the structure. These experimental results when extrapolated suggest formation of amorphous silica, quartz and chalcedony as end members in case of obsidian glass whereas, formation of iron rich fayalite and greenalite can be observed in case of nuclear waste glass. The mechanism, conditions of formation of neo-formed minerals and their stability have been discussed in the paper.","PeriodicalId":420093,"journal":{"name":"The Open Corrosion Journal","volume":"702 ","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2010-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Corrosion Mechanism in the Obsidian and its Comparison with the Nuclear Waste Glass for Long-Term Performance Assessment in the Geological Repository\",\"authors\":\"N. Rani, J. Shrivastava, R. Bajpai\",\"doi\":\"10.2174/1876503301003010016\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Present paper discusses experimental work on obsidian glass to understand corrosion mechanism at variable pressure temperature conditions. For comparison, Advanced Vitrification System, a nuclear waste glass was studied simultaneously under similar conditions. Owing to massive weight loss the glass samples were unable to sustain beyond 4 hour during the experiments. Corrosion experiments on both these glasses were performed under hydrothermal like conditions and observed that the changes in the experimental conditions have major control over the release of sodium and other ions from obsidian and nuclear waste glass, hence effecting corrosion mechanism. X-ray diffraction patterns of the residue obtained after the experiments on obsidian glass revealed appearance of neo-formed minerals, such as quartz, celadonite, halloysite, sodalite, heulandites and wairakite. High degree of corrosion and formation of amorphous residue observed in case of the experiments performed at 300 0 C over the granules of the nuclear waste glass. The back scattered electron images of the scanning electron microscope indicate distinctive microstructures, associated with the neo-formed minerals, and their formation is linked with the release of sodium, potassium and other ions, causing changes in the pH and conductivity of the leachate. In case of nuclear waste glass back scattered images of the scanning electron microscope indicates formation of multiple alteration layers and secondary alteration products. The surface of the pellet after the experiment shows phyllosilicate with numerous tiny spherules embedded within the structure. These experimental results when extrapolated suggest formation of amorphous silica, quartz and chalcedony as end members in case of obsidian glass whereas, formation of iron rich fayalite and greenalite can be observed in case of nuclear waste glass. The mechanism, conditions of formation of neo-formed minerals and their stability have been discussed in the paper.\",\"PeriodicalId\":420093,\"journal\":{\"name\":\"The Open Corrosion Journal\",\"volume\":\"702 \",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2010-03-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"The Open Corrosion Journal\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.2174/1876503301003010016\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Open Corrosion Journal","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2174/1876503301003010016","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1

摘要

本文讨论了黑曜石玻璃在变压变温条件下的腐蚀机理。为了进行比较,在类似条件下同时对核废料玻璃的高级玻璃化系统进行了研究。在实验过程中,由于玻璃样品的大量失重,无法维持超过4小时。在类似水热的条件下对这两种玻璃进行了腐蚀实验,发现实验条件的变化主要控制了黑曜石和核废料玻璃中钠等离子的释放,从而影响腐蚀机理。对黑曜石玻璃进行实验后得到的残渣进行x射线衍射分析,发现石英、celadonite、高岭土、钠长石、heulandites和wairakite等新形成矿物的形貌。在300℃下对核废料玻璃颗粒进行的实验中观察到高度腐蚀和无定形残留物的形成。扫描电镜的后向散射电子图像显示了独特的微观结构,与新形成的矿物有关,它们的形成与钠、钾和其他离子的释放有关,导致了渗滤液的pH和电导率的变化。核废料玻璃背面的扫描电镜散射图像显示了多蚀变层的形成和二次蚀变产物。实验后的球团表面为层状硅酸盐,结构中嵌有许多微小的球体。外推这些实验结果表明,在黑曜石玻璃中形成了无定形的二氧化硅、石英和玉髓作为端元,而在核废料玻璃中可以观察到富铁的铁辉石和绿辉石的形成。本文讨论了新形成矿物的形成机理、形成条件及其稳定性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Corrosion Mechanism in the Obsidian and its Comparison with the Nuclear Waste Glass for Long-Term Performance Assessment in the Geological Repository
Present paper discusses experimental work on obsidian glass to understand corrosion mechanism at variable pressure temperature conditions. For comparison, Advanced Vitrification System, a nuclear waste glass was studied simultaneously under similar conditions. Owing to massive weight loss the glass samples were unable to sustain beyond 4 hour during the experiments. Corrosion experiments on both these glasses were performed under hydrothermal like conditions and observed that the changes in the experimental conditions have major control over the release of sodium and other ions from obsidian and nuclear waste glass, hence effecting corrosion mechanism. X-ray diffraction patterns of the residue obtained after the experiments on obsidian glass revealed appearance of neo-formed minerals, such as quartz, celadonite, halloysite, sodalite, heulandites and wairakite. High degree of corrosion and formation of amorphous residue observed in case of the experiments performed at 300 0 C over the granules of the nuclear waste glass. The back scattered electron images of the scanning electron microscope indicate distinctive microstructures, associated with the neo-formed minerals, and their formation is linked with the release of sodium, potassium and other ions, causing changes in the pH and conductivity of the leachate. In case of nuclear waste glass back scattered images of the scanning electron microscope indicates formation of multiple alteration layers and secondary alteration products. The surface of the pellet after the experiment shows phyllosilicate with numerous tiny spherules embedded within the structure. These experimental results when extrapolated suggest formation of amorphous silica, quartz and chalcedony as end members in case of obsidian glass whereas, formation of iron rich fayalite and greenalite can be observed in case of nuclear waste glass. The mechanism, conditions of formation of neo-formed minerals and their stability have been discussed in the paper.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信