摘要
循环流化床燃煤固硫灰具有特殊的组分和性质,难以采用常规的粉煤灰资源化处理方法将其应用于建筑材料。城市污泥成分复杂,脱水干化成本很高。本试验以固硫灰为主要原料,利用原状湿污泥自身的黏结特性代替陶粒制备过程所需的水和黏结组分,同时发挥固硫灰中CaCO_(3)、CaSO_(4)及污泥中有机质的高温发泡功能制备轻质多孔高强陶粒。研究了固硫灰和污泥掺量、焙烧温度、助熔剂和发泡剂外掺比对固硫灰-污泥陶粒物理力学性能的影响。结果表明,外掺适量的助熔剂与发泡剂,提高焙烧温度可促进钙长石晶相的形成,使陶粒表面形成一层釉质层,内部呈多孔状结构,从而提升陶粒的物理力学性能。当固硫灰、污泥质量比为75∶25,外掺10%助熔剂和7.5%发泡剂,焙烧温度为1250℃时,制备的固硫灰-污泥陶粒满足GB/T 17431.1-2010中900级要求。
Due to the special composition and properties of CFBC fly ash,it is difficult to apply it to building materials using conventional fly ash resource treatment methods.The composition of municipal sludge is complex,and the cost of dehydration and drying is high.Taking CFBC fly ash as the main material,the bonding characteristics of the wet sludge are utilized to replace the water and bonding components required for the preparation process of the ceramic particles,at the same time,the high-temperature foaming function of CaCO_(3) and CaSO_(4) in CFBC fly ash and the organic matter in the sludge is used to obtain lightweight porous and high-strength ceramic particles.The effects of the dosage of CFBC fly ash and sludge,roasting temperature,as well as the mixture ratio of cosolvent and foaming agent on the physical and mechanical properties of CFBC fly ash-sludge ceramsite were studied.The results show that adding proper amount of cosolvent and foaming agent and increasing the calcination temperature can promote the formation of feldspar crystal phase and make the ceramsite porous inside and form a layer of glaze on the surface,thus improving the physical and mechanical properties of ceramsite.When the mass ratio of CFBC fly ash to sludge is 75∶25,10%cosolvent and 7.5%foaming agent are added,and the roasting temperature is 1250℃,the CFBC fly ash-sludge ceramsite which meets the 900 grade of GB/T 17431.1-2010 can be prepared.
作者
王燕琳
贾冠华
杨凤玲
Wang Yanlin;Jia Guanhua;Yang Fengling(Institute of Resources and Environment Engineering,Shanxi University,Taiyuan,Shanxi 030006;School of Electric Power,Civil Engineering and Architecture,Shanxi University,Taiyuan,Shanxi 030006;Comprehensive Utilization of Solid Waste(Xiangyuan)Research and Development Base,Shanxi University,Changzhi,Shanxi 046200)
出处
《非金属矿》
CSCD
北大核心
2022年第3期98-102,106,共6页
Non-Metallic Mines
基金
襄垣县固废综合利用科技攻关项目(2018XYSDYY-06)
山西省高等学校科技创新项目(2019L0049)。
关键词
固硫灰
污泥
陶粒
物理力学性能
CFBC fly ash
sludge
ceramsite
physical and mechanical properties
