Cheng T W, Chen Y S
Department of Materials and Mineral Resources Engineering, National, Taipei University of Technology, No. 1, section 3, Chung-Hsiao East Road, Taipei, Taiwan.
Chemosphere. 2003 Jun;51(9):817-24. doi: 10.1016/S0045-6535(03)00189-9.
CaO-Al(2)O(3)-SiO(2) system glass ceramics of incinerator fly ash have been prepared by vitrification and then heat-treated in different conditions. The thermal molten process (TMP) was applied to heat treat vitrified samples at high temperatures whereas in the powder sintering process water-quenched vitrified samples were ground into powder and then sintered at high temperatures. Gehlenite was found present as the major phase in all treated samples. Treated samples in general exhibited good leachability characteristics as well as chemical durability, except in the HCl solution. Microstructure and physical properties varied with the treatment condition. Fine and relatively high dense structures with desirable properties were obtained for samples treated by the TMP. For both processes, higher temperature treatments caused crystal growth and thus poor properties were attained. Good physical and mechanical properties achieved at 900-950 degrees C in this study imply the treated samples have attractive potential for engineering applications.
通过玻璃化制备了焚烧炉飞灰的CaO-Al₂O₃-SiO₂系微晶玻璃，然后在不同条件下进行热处理。采用热熔融工艺（TMP）在高温下对玻璃化样品进行热处理，而在粉末烧结工艺中，将水淬玻璃化样品研磨成粉末，然后在高温下烧结。发现钙铝黄长石是所有处理样品中的主要相。除了在HCl溶液中，处理后的样品总体上表现出良好的浸出特性以及化学耐久性。微观结构和物理性能随处理条件而变化。采用TMP处理的样品获得了具有理想性能的精细且相对高密度的结构。对于这两种工艺，较高温度的处理导致晶体生长，因此性能较差。本研究在900 - 950℃下获得的良好物理和机械性能表明，处理后的样品在工程应用方面具有诱人的潜力。
