Dissolution behaviour of sodium silicate glasses for the production of water glasses

水玻璃生产用硅酸钠玻璃的溶解行为

• 批准号: 163679958
• 负责人: Professor Dr.-Ing. Hans Roggendorf
• 金额: --
• 依托单位: Fachgruppe anorganisch-nichtmetallische Materialien (aufgelöst)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/163679958?language=en
• 关键词: Dissolution; behaviour; sodium; silicate; glasses

In industry water glasses are mainly produced by dissolving sodium silicate glasses which is treated here as an extreme of glass glass corrosion. To characterise and modell the process methods are applied whiche were developed for the corrosion of conventional glasses.Here the prolongation of a running for additional 12 months is trequested. The results obtained so far confirm known corrosion mechanisms of silicate glasses like ion exchange, network disolution, formation of an altered surface layer. Nevertheless, it was was shown crack formation occurs already during the corrosion process. Additionally, mechanical abrasion may support the dissolution process during industrial production of liquid water glasses in a rotating drum. This newly found mechanism will be investigated, if possible quantified, and integrated into the modelling of the process. Also, some of the already obtained results on corroded samples need addition investigations. Especially the characterisation of water incorporation into glass or altered surface should be examined further. Here we have acces to confocal Laser-Raman-Spektroskopie in the laboratory of a colleague in the institute of chemistry which allows the characterisation of the surface with a depth resolution of a few micrometers. These Raman spectra shall deliever more details on the speciation of the incorporated water. A further improvement of the corrsion results will be obtained by corroding the sodium silicate glasses in alkaline brines with ather alkalis. These alkaline brines are probably KOH and NH4OH, whereas LiOH will inhibit corrosion. By this means the analysis of sodium leaving the glasses should be possible, eeven if the glasses are corroded inalkaline brines.

在工业中，水玻璃主要是通过溶解硅酸钠玻璃来生产的，硅酸钠玻璃在这里被视为玻璃腐蚀的一种极端情况。为了表征和建模，应用了针对传统玻璃的腐蚀而开发的工艺方法。这里要求将运行时间再延长 12 个月。迄今为止获得的结果证实了硅酸盐玻璃的已知腐蚀机制，如离子交换、网络溶解、改变表面层的形成。尽管如此，研究表明在腐蚀过程中已经形成了裂纹。此外，机械磨损可以支持转鼓中液态水玻璃的工业生产过程中的溶解过程。我们将对这一新发现的机制进行研究，如果可能的话进行量化，并将其集成到过程建模中。此外，一些已经获得的腐蚀样品结果还需要进一步研究。特别是应进一步检查水掺入玻璃或改变表面的特征。在这里，我们在化学研究所同事的实验室中使用了共焦激光拉曼光谱仪，可以以几微米的深度分辨率对表面进行表征。这些拉曼光谱将提供有关所掺入的水的形态的更多细节。通过在碱性盐水中用其他碱腐蚀硅酸钠玻璃，可以进一步改善腐蚀结果。这些碱性盐水可能是 KOH 和 NH4OH，而 LiOH 会抑制腐蚀。通过这种方式，即使玻璃在碱性盐水中被腐蚀，也应该可以分析离开玻璃的钠。