烟气脱硫石膏综合利用可靠性研究  

Reliability study on the comprehensive utilization of FGD gypsum

作　　者：李立[1] 金晶[1] 何翔[1] 刘伟[1] 

机构地区：[1]上海理工大学动力工程学院,上海200093

出　　处：《能源研究与信息》2007年第4期205-209,共5页Energy Research and Information

摘　　要：分别利用X衍射仪和热分析仪对FGD石膏进行分析,FGD石膏的主要成分是CaSO4·2H2O,含有少量碳酸盐、磷酸盐以及未被完全氧化CaSO3等杂质。在高温使用过程中,微量CaSO3在氮气气氛下900℃左右分解释放SO2,但在有氧气氛下不会出现此现象。FGD石膏中重金属Hg的排放存在隐患,Hg排放的主要阶段集中在121℃～16 6℃温度段,应改进煅烧方法和工艺。而放射性污染则不必考虑,今后应大力推广应用FGD石膏。In this paper, an analysis of FGD gypsum was carried out by X-ray diffraction and thermogravimetry. The main component of FGD gypsum is CaSO4.2H20, and impurities involved are carbonate, phosphate and unoxidized CaSO3. When used at high temperatures, CaSO3 decomposes at ca. 900℃ in nitrogen atmosphere and releases SO2, but the phenomenon was not observed in oxygen atmosphere. A hidden trouble of heavy metal （Hg） release exists, and the main temperature window for Hg release is between 121℃ and 166℃. It is therefore necessary to improve the calcining method for FGD gypsum. The radioactive contamination of FGD gypsum can be neglected, and the FGD gypsum ought to be utilized extensively in future.

关 键 词：FGD石膏 X衍射 热重分析 

分 类 号：X705[环境科学与工程—环境工程]