焚烧炉飞灰熔融处理组成特性分析  

EFFECT OF MELTING ON COMPOSITION CHARACTERISTICS OF FLY ASH FROM MUNICIPAL SOLID WASTE INCINERATOR

作　　者：王学涛[1] 金保升[1] 仲兆平[1] 焦有宙[2] 党小剑[1] 

机构地区：[1]洁净煤发电及燃烧技术教育部重点实验室,东南大学热能工程研究所,南京210096 [2]能源洁净利用与环境工程教育部重点实验室,浙江大学热能工程研究所,杭州310027

出　　处：《环境化学》2005年第5期609-612,共4页Environmental Chemistry

基　　金：教育部博士点基金(20030286005);江苏省建设系统技术发展项目(JS200311).

摘　　要：将焚烧飞灰在不同温度下进行熔融实验,用扫描电镜对熔融前后试样的微观结构和形貌变化进行比较,结果显示:熔融体表观结构平整光滑,有较高的硬度,其断面有光泽产生且无明显气孔,试样已达到完全熔融;用X射线衍射分析仪对试样熔融前后成分的变化进行分析,未经熔融处理的试样主要晶相为:NaCl,KCl,SiO_2,CaCO_3,CaSO_4,Ca_2SiO_4以及Ca_(12)Al_(14)O_(33),CaS和钙黄长石为熔融后试样的主要晶相,其次还有CaO和透灰石;浸出实验结果显示熔融处理后飞灰的毒性得到降解.Fly ash from municipal solid waste incinerator was melted at different temperature; the physical changes of microstructure and morphology were investigated using scanning electron microscopy （SEM） and compared with the samples before and after melting treatment. It showed that the molten sample became full smooth, much harder in surface structure, while the section of the molten sample had lustrous or no apparent aperture. The fly ash can be completely melted. The changes of chemical composition and melting effect by X-Ray diffractometry for the ash and molten slag were made. The results indicated that the main crystalline phases of raw fly ash were halite, sylvite, quartz, calcite, anhydrite, larnite and mayenite. The main crystallized phases of molten ash were identified as CaS and gehlenite. Moreover, there were calcium oxide and diopside and other compounds. The leaching test on the residues after melting treatment showed that the fly ashes were successfully detoxified to meet the environmental regulatory requirements.

关 键 词：飞灰 熔融 城市生活垃圾 熔融处理 焚烧炉 特性分析 CASO4 组成 微观结构 X射线衍射 CACO3 

分 类 号：X701[环境科学与工程—环境工程]