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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

Journal of Ceramic Science and Technology, Vol. 12, No. 2 (2021), pp. 63-70

DOI: 10.4416/JCST2021-00002

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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.

Keywords

Blast furnace slag, light-green glass-ceramic, orthogonal design; heat treatment, microstructure

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