城市污泥-盐渍土高强陶粒制备及烧胀机理研究  

Research on the sintering expansion mechanism and preparation of high-strength ceramisite with municipal sludge and saline soil

作　　者：曲烈[1,2,3] 王渊[1,4] 杨久俊[1,2,3] 张磊 王光月[1] 王丽娜[1] 

机构地区：[1]天津城建大学材料科学与工程学院,天津300384 [2]天津市建筑垃圾与燃煤废弃物利用技术工程中心,天津300384 [3]天津市软土特性与工程环境重点实验室,天津300384 [4]河南省建筑科学研究院有限公司,河南郑州450053

出　　处：《新型建筑材料》2016年第2期47-51,共5页New Building Materials

基　　金：天津市自然科学重点基金项目(13JCZDJC36300)

摘　　要：以城市污泥、盐渍土和蒙脱土为原料,研究了高强陶粒最佳配合比及烧成制度。试验结果表明,当城市污泥掺量75%、盐渍土掺量20%、蒙脱土掺量5%,水料比0.4,预热温度400℃,预热时间30min,焙烧温度1150℃,焙烧时间15min时,烧制的污泥陶粒筒压强度11.1 MPa、吸水率1.06%、堆积密度0.67g/cm^3。污泥陶粒的烧胀原因是由铁碳反应引起的;污泥陶粒的增强原因是其中生成了主晶相莫来石、蓝晶石和玻璃相,莫来石在玻璃相中析晶起到增强相的作用。增加污泥掺量,将使氧化铝含量降低和莫来石相减少,并导致陶粒强度降低。Using the municipal sludge,saline soil and montmorillonite＇as raw materials,the optimum mix ratio and the sintering temperature of high strength eeramsite were investigated. The experimental results showed that the optimum properties of ceramsite,mixed with 75% sludge, 20% saline soil and 5% montmorillonite,water material ratio of 0.4, can reach bulk density 0.67 g/m3,cylinder pressure strength 11.1 MPa and water absorption rate 1.06% by preheating 30 min at 400℃ and roasting 15 rain at 1150℃. The sintering expansion of sludge ceramisite is caused by iron carbon reaction. The reason for the enhanced sludge eeramsite is the forroation of the main crystalline phase of mullite, kyanite and glass phase, in which the mullite containing in the glass phase playing an important role in reinforcing ceramisite. Increasing sludge content,the alumina content and mullite phase of ceramisite will decrease,which causes the strength of ceramsite decrease.

关 键 词：城市污泥 盐渍土 高强陶粒 莫来石 烧胀 

分 类 号：TU528.041[建筑科学—建筑技术科学]