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Study on the reaction process of alkali-activated carbonatite by means of polarizing microscope and digital holographic microscope technology

机译：偏光显微镜和数字全息显微镜技术研究碱活化碳酸盐的反应过程

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摘要

The reaction process of alkali-activated carbonatite and the dissolution rate of carbonatite with different content of MgO in water glass solution were studied in this paper by means of in-situ technologies, that is, polarizing microscope (PM) and digital holographic microscope (DHM). The volume change of carbonatite particles as a function of dissolution time was also quantified by using DHM. The results show that the dissolution rate of carbonatites decreases as the increase of Mg content (from 0 to 21.6 wt. %) in carbonatites. The average dissolution rate of carbonatite with a MgO content of 11.37wt. % in water glass (M=1.6, c=35%) is 75.33m(3)/h within the first 12hr of dissolution. Both dedolomitization and alkali-silica reaction are present in the alkali-activated carbonatite system. The Mg-carbonatite tends to dedolomitize first before it reacts with silicate ions. It explains why the Mg-rich carbonatite has a lower dissolution rate in water glass.
机译：本文利用偏光显微镜（PM）和数字全息显微镜（DHM）等原位技术研究了碱活化碳酸盐的反应过程和不同含量的MgO在水玻璃溶液中的溶解速度。 ）。碳酸钙颗粒的体积变化作为溶解时间的函数也通过使用DHM来定量。结果表明，随着碳酸盐中镁含量的增加（从0到21.6 wt。％），碳酸盐的溶解速率降低。 MgO含量为11.37wt。％的碳酸盐平均溶解速率。在溶解的前12小时内，水玻璃（M = 1.6，c = 35％）中的％为75.33m（3）/ h。碱活化的碳酸盐体系中同时存在脱脱铝和碱硅反应。镁碳酸盐在与硅酸根离子反应之前，往往会先去离子化。这解释了为什么富含镁的碳酸盐在水玻璃中的溶解速率较低。

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