期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 359, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2022.129528
关键词
Glass-ceramic foams; Fluorite tailings; Calcium phosphate; Microstructure evolution; Fluorine solidification
资金
- National Natural Science Foundation of China
- Natural Science Foundation of theJiangsu Higher Education Institutions of China
- Post-doctoral Research Foundation of Jiangsu Province
- Transformation Program of Scientific and Technological Achievements of Inner Mongolia Autonomous Region
- [52074185]
- [20KJB45002]
- [7114451120]
- [2019CG073]
This study recycled fluorite tailings and waste glass to produce glass-ceramic foams by introducing calcined kaolin and calcium phosphate. The addition of calcium phosphate promoted the formation of fluorapatite, facilitating the stabilization of toxic fluorine in the glass-ceramic foams.
Lightweight glass-ceramic foams as novel building and decoration materials exhibit great advantages. Herein, fluorite tailings and waste glass were recycled to sinter glass-ceramic foams by introducing calcined kaolin and calcium phosphate. The effects of calcium phosphate addition and sintering temperature on the crystalline phase, microstructure evolution, fluoride leaching performance and physical properties of the glass-ceramic foams were systematically investigated using X-ray diffraction, scanning electron microscopy, energy dispersive spectros-copy, Fourier transform infrared spectra, computed tomography, and differential scanning calorimetry. The obtained glass-ceramic foams sintered at 1110 degrees C exhibited relatively homogeneous pore sizes and distributions, low densities and thermal conductivities, and high compressive strengths. Moreover, the addition of calcium phosphate promoted the formation of fluorapatite, which benefited the toxic fluorine stabilization in the glass -ceramic foams. Thermodynamic data were calculated using Factsage 8.1 and verified through experiments to establish the physical structure transition during sintering. This study provides an efficient utilization route to convert fluorite tailings and waste glass into stable and valuable lightweight glass-ceramic foams.
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