流化床飞灰固化焚烧飞灰效果及微观分析  

Effect and micro-process of solidification on MSWI fly ash using circulation fluidized bed combustion coal fly ash

作　　者：刘文士[1] 张楚豪[1] 张大捷[2] 侯浩波[1] 贺杏华[3] 

机构地区：[1]武汉大学资源与环境科学学院,武汉430079 [2]武汉科技学院环境与城建学院,武汉430073 [3]中冶南方工程技术有限公司,武汉430223

出　　处：《环境工程学报》2008年第9期1260-1264,共5页Chinese Journal of Environmental Engineering

基　　金：武汉市科技攻关资助项目(20066002047);武汉大学创新基金资助项目(205270026)

摘　　要：以深圳某垃圾焚烧厂焚烧飞灰为例分析了焚烧飞灰的性质和重金属毒性。结果表明,飞灰中Pb和Cr超出TCLP阈值,必须进行稳定化处理。以流化床飞灰为主要成分配制固化材料,按不同比例掺入焚烧飞灰进行固化实验,结果表明,实验范围内重金属固定效果良好。微观测试显示,固化过程主要产物有水化硅酸钙凝胶、钙矾石等,通过物理包胶、物理吸附、复分解沉淀反应和同晶替代等作用抑制重金属浸出。The characteristics of MSWI fly ash from ted. TCLP revealed that Pb and Cr in this ash exceed the a single solid waste incineration plant were investiga- threshold values. The solidification experiments were conducted by mixing MSWI fly ash at different ratios with special cementitious materials which were mainly con- sisted of CFB fly ash. The compressive strength and TCLP data showed good effect of these stabilization proces- ses. Micro-analysis indicated that the main hydration products during the process were C-S-H gel and ettringite, which trap the heavy metals through physical encapsulation, absorption,precipitation,ionic substitution in lattice.

关 键 词：垃圾焚烧飞灰 流化床飞灰 重金属浸出 固化/稳定化 

分 类 号：X705[环境科学与工程—环境工程]