Abstract The study of the hydration properties of mechanically activated muscovite (a common mineral phase in mine tailings) was a new subject. In this paper, the effect of natural anhydrite on the hydration properties of calcium oxide-activated muscovite after mechanical activation was investigated. The mechanically activated muscovite was activated by two types of activators: calcium oxide and calcium oxide blended with natural anhydrite with contents ranging from 5%, 10%, and 15%. The hydration properties were analyzed by X-ray diffraction (XRD), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) techniques. It was found that mechanical activation was beneficial for improving the reactivity of muscovite, and the addition of calcium oxide in the mechanically activated muscovite promoted the formation of stratlingite, hydrotalcite, and C–A–S–H gel; the addition of natural anhydrite inhibited the formation of the above hydration products but promoted the formation of ettringite. The increase of anhydrite content was beneficial to the formation of ettringite. It was concluded that the muscovite possessed pozzolanic activity after mechanical activation, and it could react with calcium oxide and natural anhydrite to form hydration products.

中文翻译：

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氧化钙存在下硬石膏对机械活化白云母水化性能的影响

摘要 机械活化白云母（尾矿中常见的矿物相）的水化特性研究是一个新课题。本文研究了天然硬石膏对机械活化后氧化钙活化白云母水化性质的影响。机械活化的白云母由两种活化剂活化：氧化钙和与天然硬石膏混合的氧化钙，含量范围为5%、10%和15%。通过X射线衍射(XRD)、热重分析(TGA)和扫描电子显微镜(SEM)技术分析水合性质。发现机械活化有利于提高白云母的反应性，在机械活化的白云母中加入氧化钙促进了白云母的形成，水滑石和C-A-S-H凝胶；天然硬石膏的加入抑制了上述水合产物的形成，但促进了钙矾石的形成。硬石膏含量的增加有利于钙矾石的形成。结论是白云母在机械活化后具有火山灰活性，它可以与氧化钙和天然硬石膏反应形成水化产物。