水洗过程对垃圾焚烧飞灰浸出特性的影响

通过水洗试验，对垃圾焚烧飞灰的浸出特性进行了研究.结果表明:水洗过程对飞灰中Cl，Na，K和Ca元素具有一定的去除效果，尤其是Cl元素的去除率在液固比为10 L/kg时可达到60.0%；经过水洗后飞灰XRD图中的钾盐和食盐的特征峰已经不明显，石英和石膏特征峰改变很小，KCl和NaCl是水洗过程中K，Na和Cl元素的主要去除形态；水洗对飞灰的酸中和容量影响较小；采用TCLP法和水平振荡法进行对比试验表明，水洗灰的重金属浸出质量浓度均低于原灰. 

Effects of Water-Extraction Process on Leaching Characteristics of Municipal Solid Waste Incineration Fly Ash

Leaching characteristics of municipal solid waste incineration (MSWI) fly ash were studied through water-extraction test. The results indicated that the washing process had some effect on reducing Cl, Na, K, and Ca leachability, especially for Cl, and the leaching rate of Cl could reach 60.0% at L/S (liquid to solid ratio)10 L/kg. There were no characteristic peaks for NaCl and KClin evidence by X-ray diffraction (XRD) after water extraction, and there was little change in characteristic peaks of quartz and gypsum. KCl and NaCl were the majorleaching forms of K, Na and Cl in the washing process. The washing process had less effect on acid neutralization capacity. Leaching concentration of heavy metals from washed fly ash was higher than that from raw fly ash in TCLP testing and horizontal vibration methods.