Manufacture of the Glass-Ceramics from the Lead-Zinc Tailings by Sintering

Abstract:

The glass-ceramics of CaO-Al₂O₃-SiO₂ system were prepared by sintering using lead-zinc tailings. Orthogonal experiment was carried out to optimize the ratio of lead-zinc tailings, chemical composition of basic-glass and other chemical materials in the system. Crystallization heat treatment conditions were confirmed by the differential thermal analysis (DTA) curve of glass aggregate. Crystalline phase, crystal morphology and mechanical property of the glass-ceramics samples were studied by means of X-ray diffraction (XRD), scanning electron microscope (SEM), hardness and bending strength test. The results indicated that the optimized ratio of the samples was lead-zinc tailings 25%, quartz 46.63%, calcite 21.05%, Al₂O₃ 10.19% and nucleating agent TiO₂ 1%. The optimized crystallization heat treatment was that basic glass was first heated to 800 °C at 10 °C/min, then 800°C-900 °C at 5 °C/min and held still at 900 °C for 2 h. After that, the basic glass was heated to 1230 °C at 1-1.5 °C/min,held for 1h. At last, the glass-ceramics was obtained after the cooling-down of the system. The main crystalline phase of microcrystal glass-ceramics are diopside. The hardness and bending strength were 9.14 GPa and 213.6 MPa, respectively. The glass-ceramics had excellent chemical durability in acid and alkali solution, with weight losses of 0.17% and 0.68%, respectively.

• Periodical: Advanced Materials Research (Volumes 955-959)
• Pages: 2818-2823
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.955-959.2818
• Online since: June 2014
• Authors: Xue Lian Ou, Yan Ping Guo*, Gao Hui Zhong, Bao Qing Li, Ying Chen, Xi Ping Cao
• Keywords: Glass-Ceramics, Lead-Zinc Tailings, Main Crystalline Phase, Property, Sintering

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