污泥陶粒坯料热动力学特性  

Thermal kinetics characteristics of sludge ceramisite formula mixture

作　　者：樊臻[1] 杨鼎宜[1] 刘亚东[1] 居高艳 廖文静[1] 

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225009

出　　处：《混凝土》2015年第9期87-90,共4页Concrete

基　　金："十二五"国家科技支撑计划(2012BAJ20B01);水利部公益性行业科研专项(201201005);江苏省高校优秀中青年教师和校长境外研修计划资助

摘　　要：采用TG-DSC联合热分析方法开展污泥陶粒坯料的热反应特性研究,深入了解反应机理。根据试验所得TG曲线,分析其失重率,结合相应的温度段,判断陶粒在加热过程中发生的反应。采用多重扫描速率的不定温法,进行多条TG曲线的动力学分析,求取陶粒坯料的活化能,对三个扫描速率的热分解曲线进行多元非线性拟合,推断出最概然反应机理函数。分析结果表明：试样总的热失重率随升温速率的增加而单调增加;陶粒烧制过程升温速率不宜过快;预热温度为320～350℃;陶粒的烧成过程主要有四个阶段;陶粒坯料的热分解反应最概然机理是三步反应（t;i;i）;超轻陶粒的烧结温度控制在1 150～1 200℃之间,高强陶粒的烧结温度控制在1 150℃左右。Using TG - DSC combined with thermal analysis method to carry out the study on thermal reaction characteristics of sludge ceramisite mixture specimen in order to have a deep understanding of the reaction mechanism. According to the experimental analysisof TG curve, the rate of weight loss can be analyzed. The reaction of ceramisite mixture in the heating process can also be judged by com- bining the corresponding temperature.Using the method of multiple scan rate under non constant temperature to carry on the dynamic a- nalysis of TG curve, activation energy of ceramic mixture could be obtained.Then infer the most probable reaction mechanism function by the nonlinear multiple regression of thermal decomposition curves on three scanning rate. The results of analysis show that with the increasing of heating rate, the total heat loss rate of the sample will also increase. The heating rate should not be too fast in the process of burning ceramic. The preheating temperature should be 320 ℃ to 350℃. The firing process of ceramisite has four stages. The most probable mechanism of ceramisite mixture＇s thermal decomposition reaction is the three step reaction （t;i;i）. The sintering temperature of ultra light haydite should be controlled between 1 150 ℃ to 1 200 ℃ ,while the sintering temperature of high strength haydite ought to be controlled at about 1 150 ℃.

关 键 词：污泥 陶粒 热动力学 反应机理 活化能 

分 类 号：TU528.041[建筑科学—建筑技术科学]