管道煤气生产中汞的分布  

DISTRIBUTION OF MERCURY IN COAL GAS GENERATING PROCEDURE

作　　者：洪冰[1] 朱咏煊[1] 冯新斌[1] 王羽[1] 

机构地区：[1]中国科学院地球化学研究所环境地球化学国家重点实验室,贵州贵阳550002

出　　处：《地球与环境》2004年第2期12-16,共5页Earth and Environment

基　　金：国家自然科学基金(40273043);贵州省自然科学基金

摘　　要：为了解城市管道煤气生产中可能存在的汞污染,对贵阳市管道煤气及煤气生产所使用的洗精煤、煤气生产过程中产生的化学产品焦碳、焦油及焦炉煤气脱硫洗涤物硫浆中汞的含量和分布进行了研究。研究发现,管道煤气中汞的含量低于二次金汞齐-冷原子吸收光谱法检测限0.05ng/m3,较贵阳市城区大气汞的含量还低。在原煤转化为城市管道煤气过程中,煤中的汞在煤气生产的各个环节都有不同程度的脱除:其中原煤的洗选过程是最主要的脱汞过程,约75%左右的汞在该过程中被脱除;焦碳中汞含量占洗精煤汞含量的14.1%;煤焦油中汞含量占洗精煤中汞的15.5%;硫浆的生成过程则脱除了煤气生产用洗精煤中51%的汞。Two-stage gold amalgamation cold vapor atomic adsorption spectrometry was employed to determine the contents of mercury in coal gas in Guiyang City. The mercury contents in fancy coal, coke, tar and leached sulfide were determined. The contents of mercury in coal gas are less than 0.05ng/m^3, obviously lower than those of atmosphere in Guiyang City. The mercury is gradually eliminated in coal gas generating procedure because of coal cleaning, nearly 75 percent of mercury in coal is eliminated. The average contents of mercury in coke, tar and leached sulfide are 0.03μg/g, 0.88μg/g and 25.56μg/g, accounting for 14.1%, 15.5% and 51.3% of the mercury in fancy coal, respectively.

关 键 词：汞 管道煤气 硫浆 

分 类 号：X142[环境科学与工程—环境科学]