生活垃圾焚烧飞灰的热性质  

Thermal Property of MSWI Fly Ash

作　　者：张海英[1] 赵由才[2] 祁景玉[3] 

机构地区：[1]上海应用技术学院环境与能源工程系,上海200235 [2]同济大学污染控制与资源化研究国家重点实验室 [3]同济大学海洋地质与地球物理学院,上海200092

出　　处：《环境科学与技术》2007年第4期84-86,共3页Environmental Science & Technology

基　　金：国家科技部世博专项;上海市科委2005年重大专项资助项目(05DZ12181)

摘　　要：利用综合热分析仪对飞灰进行了差热与热重分析,并利用X-射线衍射仪分析了不同温度煅烧后飞灰的矿物成分变化。结果表明:781～956℃温度区间,飞灰的质量下降超过15%;956～1241℃温度区间,质量下降8%左右;温度超过1241℃时,飞灰的质量基本保持不变,出现大量的化合反应,飞灰表现出较好的活性;飞灰的主要矿物成分是SiO2、CaCl2、Ca3Si2O7、Ca2SiO4·0.35H2O、Ca9Si6O21·H2O、K2Al2Si2O8·3.8H2O和AlCl3·4Al(OH)3·4H2O,晶相含量高达59%;高温下飞灰中的盐类首先分解生成金属氧化物,随温度的升高,所产生的金属氧化物再与SiO2反应生成硅酸盐或铝硅酸盐。TGA-DTA analysis was performed on MSWI fly ash using thermal analyzer,and its mineral constitutions after being sintered at different temperatures were detected using XRD.It was found that mass of fly ash decreased by over 15% and by around 8% respectively between 781℃ and 956℃ and between 956℃ and 1,241℃,and stayed unchanged between 1,241℃ and 1,400℃.The fly ash showed considerable activity when temperature was higher than 1,241℃.As temperature increased,salts were decomposed into metal oxides that reacted with SiO2 to generate silicates or aluminosilicates.

关 键 词：生活垃圾焚烧飞灰 热性质 差热分析 热重分析 

分 类 号：X705[环境科学与工程—环境工程]