Utilization of municipal solid waste incineration fly ash for sulfoaluminate cement clinker production.
Utilization of municipal solid waste incineration fly ash for sulfoaluminate cement clinker production.
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DOI：
10.1016/j.wasman.2011.04.022
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发表时间：
2011-09
期刊：
影响因子：
8.1
通讯作者：
Kai Wu;Hui-sheng Shi;Xiaolu Guo
中科院分区：
文献类型：
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作者：
Kai Wu;Hui-sheng Shi;Xiaolu Guo
通过X射线衍射（XRD）、抗压强度和自由膨胀率测试，研究了城市生活垃圾焚烧飞灰部分替代原料生产硫铝酸盐水泥（SAC）熟料的可行性。使用三种不同的沥滤试验来评估所生产材料的环境影响。实验结果表明，垃圾焚烧飞灰在生料中的替代率可达30%。控制碱度模数（Cm）在1.05左右，铝硫比（P）在2.5左右，铝硅比（N）在2.0 ~ 3.0左右，在1250°C烧成2 h，可获得质量较好的SAC熟料。SAC早期抗压强度较高，后期抗压强度发展缓慢。结果还表明，SAC的膨胀性能强烈依赖于石膏含量。在水化SAC为基础的系统中的有毒元素的浸出研究表明，所有的调查元素都很好地结合在熟料矿物或固定的水化产物。虽然一些有限的积极结果表明，垃圾焚烧飞灰制备的SAC不会对环境产生直接影响，但长期毒性浸出行为需要进一步研究。
The feasibility of partially substituting raw materials with municipal solid waste incineration (MSWI) fly ash in sulfoaluminate cement (SAC) clinker production was investigated by X-ray diffraction (XRD), compressive strength and free expansion ratio testing. Three different leaching tests were used to assess the environmental impact of the produced material. Experimental results show that the replacement of MSWI fly ash could be taken up to 30% in the raw mixes. The good quality SAC clinkers are obtained by controlling the compositional parameters at alkalinity modulus (Cm) around 1.05, alumina–sulfur ratio (P) around 2.5, alumina–silica ratio (N) around 2.0∼3.0 and firing the raw mixes at 1250°C for 2h. The compressive strengths of SAC are high in early age while that develop slowly in later age. Results also show that the expansive properties of SAC are strongly depended on the gypsum content. Leaching studies of toxic elements in the hydrated SAC-based system reveal that all the investigated elements are well bounded in the clinker minerals or immobilized by the hydration products. Although some limited positive results indicate that the SAC prepared from MSWI fly ash would present no immediate thread to the environment, the long-term toxicity leaching behavior needs to be further studied.