污水污泥页岩陶粒烧胀特性  

CALCINING EXPANSION BEHAVIOR OF SEWAGE SLUDGE WITH SHALE

作　　者：罗晖[1,2] 钱觉时[1] 陈伟[1] 邓成[1] 黄义雄[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400045 [2]重庆市建筑科学研究院,重庆400015

出　　处：《硅酸盐学报》2010年第7期1247-1252,共6页Journal of The Chinese Ceramic Society

基　　金：国家"863"计划(2007AA03Z553);重庆市重点科技项目(CSTC2007AB-7043)资助

摘　　要：利用污水处理厂的原状污水污泥混合页岩制备陶粒,采用热重-差热分析、X射线衍射、红外光谱等手段分析陶粒烧胀过程。研究了污水污泥掺量和烧胀温度对陶粒的表观密度和强度的影响及污水污泥页岩陶粒烧胀机理。结果表明:污水污泥掺量为20%～30%,烧胀温度达到1150℃时,可得到轻质的烧胀陶粒;掺入污水污泥会增加陶粒生料中有机质烧失量,降低熔融温度,增强烧胀时的还原性气氛,较大网状Si—O四面体聚合度,生成铁橄榄石等更易熔融的矿物,增强熔融程度,从而提高陶粒烧胀性能。Sewage sludge with high water contents from the sewage treatment plant was mixed with shale to calcine an expanded shale.The calcining expansion process of the expanded shale was analyzed by thermogravimetric-differential thermal analysis,X-ray diffraction,and Fourier transform infrared spectroscopy.The effects of the sewage sludge content and calcining expansion temperature on the apparent particle density and strength were investigated.The expanding mechanism of the expanded shale contained sewage sludge was also discussed.The results show that the lightweight expanded shale can be obtained at the sewage sludge contents of 20%-30% and the calcining expansion temperature of 1 150 ℃.The addition of sewage sludge could lead to a higher ignition loss of raw materials,and lower the melting temperature,resulting in the stronger reduction atmosphere during calcining process.Therefore,the polymerization degree of reticular Si—O tetrahedron can be reduced largely and the minerals like fayalite are formed,which promotes the melting degree and the calcining expansion of expanded shale.

关 键 词：陶粒 污水污泥 烧胀 温度 

分 类 号：X705[环境科学与工程—环境工程]