重庆市新型干法水泥厂汞排放特征  

Characteristics of Mercury Emissions from Modern Dry Processing Cement Plants in Chongqing

作　　者：张成[1,2] 张雅惠[1] 王永敏[1] 王定勇[1,2] 罗程钟[3] 徐凤[3] 何秀清[3] 

机构地区：[1]西南大学资源环境学院,重庆400715 [2]重庆市农业资源与环境研究重点实验室,重庆400715 [3]重庆市固体废物管理中心,重庆401117

出　　处：《环境科学》2017年第6期2287-2293,共7页Environmental Science

基　　金：国家重点基础研究发展规划(973)项目(2013CB430004);重庆市环境保护局科技项目(2013CF101);中央高校基本科研业务费专项(XDJK2015B036)

摘　　要：以重庆市3个新型干法水泥厂为研究对象,分析典型水泥厂输入输出物料汞含量,探讨水泥厂中汞的来源和去向,研究重庆市典型新型干法水泥厂汞的排放特征,估算其大气汞排放量和排放因子.结果表明,3个水泥厂的汞主要来源为石灰石,其次为煤.石灰石汞含量为(0.025±0.001)^(0.032±0.002)mg·kg^(-1),煤汞含量为(0.080±0.002)^(0.110±0.012)mg·kg^(-1).脱硫石膏汞含量较高,为(0.447±0.007)^(0.525±0.009)mg·kg^(-1),其余原料的汞含量均较小.3个水泥厂排放的汞主要进入了烟气,脱硫石膏中的汞主要进入了水泥产品.3个水泥厂的大气汞排放量为(73.42±8.10)^(215.18±10.75)g·d-1,大气汞排放因子(EF熟料、EF水泥)分别为(0.016±0.001)^(0.049±0.001)g·t-1和(0.011±0.000)^(0.036±0.001)g·t-1,明显低于以往水泥行业采用的国外汞排放因子.Three typical modern dry processing cement plants in Chongqing were chosen to investigate mercury emission characteristics and its source and fate through a mercury mass balance method by analyzing mercury contents in all input and output materials. The results showed that limestone was the main source of mercury in three cement plants followed by coal, and their mercury concentrations were （0.025±0.001）-（0.032±0.002） mg·kg-1and （0.080±0.002）-（0.110±0.012） mg·kg-1, respectively. The highest mercury level in all required input materials was （0.447±0.007）-（0.525±0.009） mg·kg-1 for gypsum, while the mercury content of other raw materials were very low. Most of the mercury released from these cement plants entered into flue gas, and the mercury of gypsum entered into cement. The mercury emission fluxes were calculated to be （73.42±8.10）-（215.18±10.75） g·d-1 in these three selected plants. The mercury emission factors for clinke and cement （EFclinker and EFcement） were （0.016±0.001）-（0.049±0.001） g·t-1 and （0.011±0.000）-（0.036±0.001） g·t-1, respectively, which were significantly lower than that employed in cement industry according to the foreign mercury emission factors in the past.

关 键 词：水泥厂 汞排放 排放因子 回转窑 重庆 

分 类 号：X511[环境科学与工程—环境工程]