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Influence of Low-Pressure Treatment on the Morphological and Compositional Stability of Microscopic Ettringite

机译:低压处理对微观静物矿体形态学和组成稳定性的影响

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摘要

The impact of low-pressure treatment on the crystal structure, morphology, and chemical composition of ettringite, due to their major importance with respect to processability (i.a., drying conditions) and to the analysis of ettringite-containing samples, is examined utilizing X-ray diffraction, thermogravimetric analysis, Raman spectroscopy, and environmental scanning electron microscopy. Synthetic ettringite was treated for various durations (5 min up to 72 h) and at two different levels of low-pressure (4.0 mbar and 60 µbar). Evaluation showed a correlation between the procedural parameters (time and pressure), the chemical composition, and the morphology of ettringite. The experiments reveal that, when exposed to 4 mbar pressure, nearly no changes occur in the ettringite’s morphology, whereas the crystals undergo swelling and slight deformations at very low pressures (60 µbar and 35.3 nbar), which is attributed to the loss of bound water and the partial transformation from ettringite to quicklime, anhydrite, and calcium aluminate. Furthermore, the strongly dehydrated ettringite shows the same morphology.
机译:使用X-检查低压处理对Ettringite的晶体结构,形态和化学成分对Ettringite的晶体结构,形态和化学成分的影响,采用X-检查含有肠杆菌矿石的样品的主要重要性。光线衍射,热重分析,拉曼光谱和环境扫描电子显微镜。将合成的Ettringite用于各种持续时间(5分钟至72小时)和两种不同水平的低压(4.0mbar和60μbar)。评价显示程序参数(时间和压力),化学成分和Ettringite的形态之间的相关性。实验表明,当暴露于4毫巴的压力时,在Ettringite的形态发生几乎不会发生变化,而晶体在非常低的压力(60μBAR和35.3个NAb)下经历肿胀和轻微变形,这归因于结束水的损失以及从Ettringite到Quicklime,AnhyDrite和钙钙的部分转化。此外,强脱水的Ettringite表现出相同的形态。

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