污泥页岩陶粒的焙烧膨胀机理探讨  

Study on expansion of sludge spherical ceramsite prepared by sludge and shale

作　　者：丁庆军[1] 王承[1] 黄修林[2] 

机构地区：[1]武汉理工大学硅酸盐工程中心国家重点实验室,湖北武汉430070 [2]湖北大学材料科学与工程学院,湖北武汉430070

出　　处：《新型建筑材料》2014年第11期1-4,8,共5页New Building Materials

基　　金：国家"十二五"科技支撑计划项目(2011BAJ04B05-02);国家自然科学基金资助项目(51272192)

摘　　要：以城市生活污泥为主要原料,辅之页岩为校正原料,制备污泥球型陶粒,并通过正交实验,就陶粒生料配合比、烧成制度对陶粒吸水率、膨胀效果、表观密度的影响进行探讨;阐述污泥陶粒制备的焙烧机理与膨胀机理。研究发现,预烧温度为400℃左右,污泥体系再固定挥发组分为发气组分,且含铁物质析出赤铁矿相,有利于陶粒的膨胀;陶粒的烧结过程与烧涨过程同时进行,二者在不同温度段起到主导作用。In this article,with raw materials of urban life sludge and shale,sludge spherical ceramsite could be prepared,and the effect of the proportion of raw materials, sintering system on ceramsite bibulous rate,expansion effect, and the apparent density of the sludge spherical ceramsite are analyzed by orthogonal experiment. The sintering and expansion mechanism for preparation of sludge spherical ceramsite are explained. It was found that presintering temperature was about 400℃, gas components were secondly fixed in the system,and the ferrous material recipitated hematite phase,which promoted expansion, sintering process and expansion process existed at the same time,which played a leading role at the different temperature.

关 键 词：污泥 膨胀机理 正交实验 焙烧机理 

分 类 号：TU551.3[建筑科学—建筑技术科学] X705[环境科学与工程—环境工程]