The Mechanism of the First Hydration-Dehydration Cycle of Pure α- and β-CaSO4•0.5H2O

The Mechanism of the First Hydration-Dehydration Cycle of Pure α- and β-CaSO4•0.5H2O
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纯α-和β-CaSO4™0 5H2O 第一次水合-脱水循环的机理

DOI:
10.1155/2020/1732621
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发表时间:
2020
影响因子:
--
通讯作者:
Trettin
Trettin
中科院分区:
材料科学4区
文献类型:
--
作者:
Pritzel;Abu Zeitoun;Sakalli;Trettin

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本研究的目的是了解工业二水合物的脱水机理以及β-半水合物在第一次水化-脱水过程中的物理性质的变化。本研究对不同类型半水合物作为原料的回收利用机理进行了研究。通过差热分析(DCA)、钙离子选择电极(Ca~(2+)-ISE)、电导率、粒度分布(PSD)、扫描电子显微镜(SEM)和X射线衍射仪(X射线衍射仪)表征了第一次水化脱水工艺对再生半水化料的水化速率、微观结构和力学性能的影响。结果表明,一次水化脱水后形成的半水合物与未回收的半水合物在形态结构、表面数量以及一次水化后的研磨过程中产生的侧向缺陷等特性上有所不同。除了研磨步骤外,煅烧过程还增加了晶体表面的缺陷数量,从而导致凝结时间和回收半水合物的微观结构发生变化。因此,在β-HH的第一个反应循环之后,由于半水晶体尺寸的减小、比表面积的增加以及执行水化反应所需的水量的增加,抗压强度降低。由于第一次循环后的焙烧工艺,第一次水化脱水后得到的半水合物为β形式。
The objective of this research was to understand the dehydration mechanism of technical dihydrate and the variation of the physical properties ofβ‐hemihydrate after the first hydration‐dehydration process. In this study, the recycling mechanism of different hemihydrate types as raw material was investigated. The influence of the first hydration‐dehydration process on the hydration rate, microstructure, and mechanical properties of recycled hemihydrate were characterized by differential calorimetric analysis (DCA), calcium ion‐selective electrode (Ca2+‐ISE), conductivity, particle size distribution (PSD), scanning electron microscopy (SEM), and X‐ray diffraction (XRD). The results showed that the formed hemihydrate after the first hydration‐dehydration process differs in its properties than the unrecycled hemihydrate in some characteristics such as the morphological structure, number of surface, and side defects due to the grinding process after the first hydration step. In addition to the grinding step, the calcination process was responsible for increasing the number of defects on the crystal surface, which leads to a change in setting time and the microstructure of the recycled hemihydrate. Therefore, after the 1st reaction cycle ofβ‐HH, the compressive strength decreases due to a decrease in the hemihydrate crystal size, an increase in the surface area, and an increase in the amount of water required to perform the hydration reaction. The obtained hemihydrate after the first hydration‐dehydration process was inβform due to the applied calcination process after the first cycle.
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发表时间: 2023
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影响因子: 8.6
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DOI: --
发表时间: 2017
期刊: Journal of Wuhan University of Technology-Mater. Sci. Ed.
影响因子: --
作者:
Zhixin Li;J. Peng;Xingxing Qiu
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