【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。更多还原

【Abstract】 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?2H2O,and impurities involved are carbonate,phosphate and unoxidized CaSO3.When used at high temperatures,CaSO3 decomposes at ca.900℃ in nitrogen atmospher e 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.更多还原