【摘要】 为研究熔融固化过程中飞灰主要成分的迁移转化规律,在有温控的高温实验熔融炉中对垃圾焚烧飞灰进行了动态熔融固化实验研究,对处理后的飞灰进行了XRF、XRD分析检测,分析了飞灰熔融过程中熔融渣的主要成分、物相组成、碱度、挥发率和减容率的变化规律.试验结果表明:①飞灰中主要成分CaO、Al2 O3 和SiO2 的质量分数随着温度的升高而增加,而主要成分Cl元素和SO3 则从原来的2 0 . 5 9%和1 0 . 74 %分别降低到0 . 1 5 %和0 . 2 2 %,可见高含量Cl元素和S元素是引起飞灰熔融固化挥发率高的主要原因,并且可能主要以氯化物和硬石膏的形式分解挥发,XRD的测定结果也进一步证明了这一点.②飞灰熔融前,碱度随温度的升高而显著降低,但当温度达到流动温度后,碱度值随温度的变化很小,基本保持在0 . 95左右.③飞灰中盐类分解挥发主要发生在1 1 5 0℃～1 2 6 0℃之间,在飞灰熔融温度前约1 0 0℃的范围内.更多还原

【Abstract】 This study was conducted to investigate the migration patterns of main compositions of the fly ash from refuse incinerator during melting and solidification process.The experiment was performed in a hightemperature melting furnace with temperature controlled. X-ray fluorescence spectroscopy（XRF） and X-ray diffractometer （XRD） were used to analyzed the fly ash treated. The parameters investigated included main compositional contents, phase constituents, alkalinity, vaporation rate, volume reduction rate. The results show:①During the metling and solidification process, the contents of CaO, Al₂O₃, and SiO₂ in fly ash increased as the temperature went up, but element Cl and S decreased from initial 20.59%、10.74% to final 0.15%、0.22%, respectively. This suggests that higher amount of Cl and S in original fly ash could lead to more vaporation in the form of chloride and calcium salfate in the process, which was further verified by XRD analyzing result. ②The alkalinity decreased as melting temperature increased, but tended to be stable and maintained around 0.95 after temperature reached flowing temperature. ③The decomposition and vaporation of the salts in the fly ash mainly occurred in the temperatures between 1 150℃ and 1 260℃, which was approximately 100 ℃ lower than melting temperature.更多还原