School of Environmental Engineering, Technical University of Crete, Politechnioupolis, Chania 73100, Greece.
School of Mineral Resources Engineering, Technical University of Crete, Politechnioupolis, Chania 73100, Greece.
Waste Manag. 2019 May 1;90:46-58. doi: 10.1016/j.wasman.2019.04.022. Epub 2019 Apr 24.
This study investigates an innovative approach for the valorization of specific wastes generated from the energy sector and the production of glass-ceramics. The wastes used were photovoltaic (P/V) glass, produced from the renewable energy sector, and lignite fly ash, produced from the conventional energy sector. The process first involved the production of glass after melting specific mixtures of wastes, namely (i) 70% P/V glass and 30% lignite fly ash, and (ii) 80% P/V glass and 20% lignite fly ash, at 1200 °C for 1 h as revealed by the use of a heating microscope. The results indicated that the P/V glass, as a sodium-potassium-rich inorganic waste, reduces energy requirements of the melting process. The produced glass was then used for the production of glass-ceramics. Dense and homogeneous glass-ceramics, exhibiting high chemical stability and no toxicity, were produced after controlled thermal treatment of glass at 800 °C. The mechanical (compressive strength, Vickers hardness) and physical (open porosity, bulk density and water absorption) properties of the produced glass-ceramics were evaluated. X-ray diffraction (XRD) and Energy Dispersive X-ray fluorescence (ED-XRF) were used for the characterization of the raw materials and the produced glass-ceramics. Scanning electron microscopy (SEM) provided further insights on the microstructure of the final products. The properties of the produced glass-ceramics, namely water absorption and compressive strength, render them suitable for applications in the construction industry. The waste valorization approach followed in this study is in line with the principles of circular economy.
本研究探讨了一种从能源部门和生产微晶玻璃的特定废物中实现增值的创新方法。所用的废物是光伏（P/V）玻璃，由可再生能源部门生产，以及褐煤飞灰，由常规能源部门生产。该过程首先涉及在将特定混合物（即(i)70% P/V 玻璃和 30%褐煤飞灰，和(ii)80% P/V 玻璃和 20%褐煤飞灰）在 1200°C 下熔化 1 小时后生产玻璃，这一点可以通过使用加热显微镜来揭示。结果表明，作为一种富含钠钾的无机废物，P/V 玻璃降低了熔化过程的能源需求。然后，将生产的玻璃用于生产微晶玻璃。在将玻璃在 800°C 下进行受控热处理后，生产出了致密且均匀的微晶玻璃，表现出高化学稳定性和无毒。对所生产的微晶玻璃的机械（抗压强度、维氏硬度）和物理（开口孔隙率、体密度和吸水率）性能进行了评估。X 射线衍射（XRD）和能量色散 X 射线荧光（ED-XRF）用于原材料和生产的微晶玻璃的表征。扫描电子显微镜（SEM）提供了最终产品微观结构的进一步见解。所生产的微晶玻璃的性能，即吸水率和抗压强度，使其适合在建筑行业中应用。本研究中采用的废物增值方法符合循环经济的原则。
