Structure and performance of glass–ceramics obtained by Bayan Obo tailing and fly ash

• Published in: Journal of non-crystalline solids 2013-11, Vol.380, p.103-108
• Main Authors: Baowei, Li, Leibo, Deng, Xuefeng, Zhang, Xiaolin, Jia
• Format: Article
• Language: English
• Subjects: Bayan Obo tailing; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Differential scanning calorimetry; Diffraction; Exact sciences and technology; Fly ash; Glass; Glass ceramic; Glass ceramics; Glasses (including metallic glasses); Growth from solid phases (including multiphase diffusion and recrystallization); Materials science; Mechanical and acoustical properties of condensed matter; Methods of crystal growth; physics of crystal growth; Nucleation; Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Physics; Scanning electron microscopy; Specific materials; Tailings
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2013.09.012

Glass in the CaO–Al2O3–MgO–SiO2 quaternary phase system has been obtained by the Bayan Obo tailing and fly ash as main raw materials. On the basis of differential scanning calorimetry (DSC) analyses, this article took the glass and glass–ceramic samples which the Bayan Obo tailing and fly ash added respectively to 50% and 20% as the object of study. Nucleation experiment was carried out at 720°C for 2h whereas crystallization experiment was performed at 880°C for 2h. The phases and microstructure of glass and glass–ceramic samples were characterized by X-ray diffraction (XRD), Raman spectra, transmission electron microscopy (TEM) and scanning transmission electron microscope (STEM). In addition, physical and mechanical properties of the produced glass–ceramics have been examined. The results demonstrate that the glass–ceramics have potential for a wide range of construction application. •Glass and glass–ceramics have been obtained by Bayan Obo tailing and fly ash.•We report the key role of Fe2O3, Cr2O3 and CaF2 from Bayan Obo tailing.•Diopside, fluorite, quartz and silicon oxide have precipitated in glass–ceramics.•The size of crystals in the glass–ceramic prepared by ourselves is below 300nm.•The structure of the glass–ceramic was characterized by using Raman spectroscopy.•We provide an effective way for comprehensive utilization of Bayan Obo and fly ash.