The harm caused by mine tailings has become increasingly problematic in recent years, so efforts are needed to dispose of or reutilize them in environmentally friendly ways. The objective of the present study was to find out if the hydration properties of muscovite contained in mine tailings are suitable for it to be used as a pozzolan in cement, after undergoing mechanical activation. Aqueous suspensions of mechanically activated muscovite were blended with 10, 20, or 30 wt.% calcium oxide and then allowed to harden. The hardened paste samples were analyzed by X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS) techniques. The results revealed that the mechanically activated muscovite exhibited pozzolanic reaction activity in the alkaline environment provided by calcium oxide, and the activated muscovite possessed a capacity to react with calcium hydroxide to form hydration products. The calcium oxide content affected significantly the quantities and kinds of hydration products, non-evaporable water content, and the compressive strength development of the paste samples. The hydration products of the 10% calcium oxide-activated, mechanically activated muscovite pastes were Al-containing hydrated calcium silicate (C-A-S-H) gel, stratlingite, and, upon addition of 20% and 30% calcium oxide, Ca-Al hydrotalcite-like (Ht) phases. The present study was helpful in evaluating the hydration properties of the mechanically activated muscovite and also provided a research basis for evaluating the hydration properties of mine tailings containing muscovite after mechanical activation. The results provided a theoretical basis for muscovite-containing mine tailings to be used as a cement additive, and was conducive to the large-scale utilization of mine tailings.

中文翻译：

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氧化钙存在下机械活化白云母的水合特性

近年来，矿山尾矿造成的危害越来越严重，因此需要努力以环保的方式对其进行处置或再利用。本研究的目的是找出尾矿中所含白云母的水化特性是否适合在机械活化后用作水泥中的火山灰。将机械活化白云母的水悬浮液与 10、20 或 30 重量％的氧化钙混合，然后使其硬化。通过 X 射线衍射 (XRD)、热重分析 (TGA)、扫描电子显微镜 (SEM) 和能量色散 X 射线光谱 (EDS) 技术对硬化的糊状物样品进行分析。结果表明，机械活化的白云母在氧化钙提供的碱性环境中表现出火山灰反应活性，活化的白云母具有与氢氧化钙反应形成水合产物的能力。氧化钙含量显着影响水化产物的数量和种类、不可蒸发的水含量以及糊状物样品的抗压强度发展。10% 氧化钙活化、机械活化的白云母糊剂的水合产物是含铝的水合硅酸钙 (CASH) 凝胶、海钙石，并在添加 20% 和 30% 氧化钙后，Ca-Al 类水滑石（ Ht) 相。本研究有助于评价机械活化白云母的水化特性，也为评价含白云母尾矿机械活化后的水化特性提供研究依据。研究结果为含白云母尾矿作为水泥添加剂提供了理论依据，有利于尾矿的规模化利用。