Preparation of low melting temperature glass–ceramics from municipal waste incineration fly ash
Preparation of low melting temperature glass–ceramics from municipal waste incineration fly ash
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DOI：
10.1016/j.fuel.2009.01.019
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发表时间：
2009-07
期刊：
影响因子：
7.4
通讯作者：
Jiakuan Yang;B. Xiao;A. Boccaccini
中科院分区：
文献类型：
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作者：
Jiakuan Yang;B. Xiao;A. Boccaccini
以中国南方某城市垃圾焚烧厂的大气污染控制残渣（粉煤灰）为原料制备微晶玻璃。研究了添加剂的使用，以降低废物的熔融温度，从而降低从玻璃化废物生产玻璃陶瓷的成本。结果表明，将垃圾焚烧飞灰与硅砂粉、富Fe 2 O3富CaO的铁渣混合，形成SiO2-CaO-Al 2 O3-Fe 2 O3四元体系玻璃，可使玻璃的熔化温度从1500 °C降至1200°C。以碳酸钠和硼砂为助熔剂，添加化学级TiO 2为成核剂。高熔点和低熔点微晶玻璃的主晶相均为透辉石（含铁），在800-900 ℃晶化1- 2 h后，显微结构均为100- 200 nm的细晶。测试了玻璃陶瓷材料的浸出行为，发现其浸出行为低于使用相同废物制造的水泥稳定体的浸出行为。因此，结果表明，在相对较低的熔融温度下，例如在能量密集度较低的过程中，将垃圾焚烧飞灰再用于玻璃陶瓷生产的可行性，作为解决有害垃圾焚烧残留物问题的可行方法。
Glass–ceramics have been prepared from air pollution control residues (fly ash) of a municipal solid waste incineration (MSWI) plant in southern China. The use of additives was investigated in order to decrease the melting temperature of the waste and thus to reduce the costs of production of glass–ceramics from the vitrified waste. Results showed that the melting temperature can be decreased significantly from 1500 to 1200°C, which was achieved by combining the MSWI fly ash with silica sand powder and a Fe2O3-rich and CaO-rich iron slag to form a glass in the SiO2–CaO–Al2O3–Fe2O3quaternary phase system. Sodium carbonate and borax were used as fluxing agents and TiO2of chemical grade was added as a nucleation agent. The main crystalline phase in both high and low melting temperature glass–ceramics was found to be diopside (Fe-bearing), and the microstructure exhibited the presence of fine crystals of size in the range 100–200nm which developed at crystallization temperatures in the range 800–900°C for 1–2h. The leaching behaviour of the glass–ceramic materials was tested, and it was found to be lower than that of a cement-stabilized body that was fabricated using the same waste for comparison. The results demonstrate thus the feasibility of reusing MSWI fly ash for glass–ceramic production at relatively low melting temperature, e.g. in a less energy-intensive process, as a viable approach for tackling the problem of hazardous MSWI residues.