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Optimization of the Heat Treatment Process for Preparing Light-Green Glass-Ceramics from Blast Furnace Slag
Yi-ci Wang, Rui-xin Wang, Yi-fan Wang, Jia Liu, Yi-fan Chai, Guo-ping Luo
School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Inner Mongolia, Baotou, 014010, China
received February 15, 2021, received in revised form April 12, 2021, accepted April 15, 2021
Vol. 12, No. 2, Pages 63-70 DOI: 10.4416/JCST2021-00002
Abstract
Light-green slag-based glass-ceramics were prepared using blast furnace water-quenched slag from the Baotou Iron and Steel Group as the main raw material. An orthogonal experimental design was used to study the influence of heat treatment process parameters on the flexural strength, devitrified mineral composition, and microstructure of the glass-ceramics. The order of influencing factors is crystallization temperature > nucleation time > nucleation temperature > crystallization time. The optimal heat treatment protocol comprised a nucleation temperature of 660 °C, a nucleation time of 2.5 h, a crystallization temperature of 822 °C, and a crystallization time of 2 h. The mineral composition and microstructure of the glass-ceramics were analyzed by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS). The main crystal phase of all glass-ceramics prepared under the different heat treatment regimes was fluorapatite, Ca5(PO4)F3. Under optimal heat treatment, the number of crystal grains of the glass-ceramic was large, their distribution was uniform and dense, the degree of crystallinity was high, and the flexural strength was 76.83 MPa.
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Keywords
Blast furnace slag, light-green glass-ceramic, orthogonal design; heat treatment, microstructure
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Göller Verlag GmbH
Acknowledgments
This work was financially supported by the Joint Project of Inner Mongolia Natural Science Foundation (2018LH05026) and Special Project for Transformation of Scientific and Technological Achievements in Inner Mongolia (2019 CG073) and "Solid Waste Resource" National Key Research & Development Project (2020YFC1909105).
