Characteristics of Alkali-Activated Lithium Slag at Early Reaction Age
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 12
Abstract
Lithium slag (LS), which is a byproduct of lithium salt production, has never been reported in alkaline activation studies. In this work, either characteristics of reaction products of alkali-activated lithium slag (AALS), such as phase compositions, microstructure, specific surface area, and water content, or the pore solution composition in AALS at an early reaction age is investigated. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to study the phases and microstructural morphology of AALS samples at typical reaction times (, 30 min, 1 h, 3 h, 6 h, 12 h, and 24 h). In particular, the combination of Fourier transformation infrared (FT-IR) spectroscopy and solid-state nuclear magnetic resonance ( NMR) were used to analyze the bonding linkage and the adjacent coordination structure of in LS and intermediate products of AALS. The results indicate that the Si─ O─ Si bond decreases while the Si─ O─ Al bond increases with alkaline activation reaction (AAR) enhancing and the chemical environment of Si preferred to and units compared with original LS, of which has more and units. Moreover, the composition of the pore solution was determined by inductively coupled plasma optical emission spectroscopy (ICP-OES). This paper reveals the evolution of AALS from multiple perspectives and may be of great significance for solid waste utilization.
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Acknowledgments
This work was financially supported by the National Key Research and Development Program of China (2017YFC0703203) and Beijing Municipal Nature Science Foundation (2192047).
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©2019 American Society of Civil Engineers.
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Received: Oct 11, 2018
Accepted: Jun 14, 2019
Published online: Oct 15, 2019
Published in print: Dec 1, 2019
Discussion open until: Mar 15, 2020
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