煤中汞的赋存形态及其测定方法  

Characterization of Hg occurrence in coal and its analysis method

作　　者：马晶晶[1] 罗光前[1] 李显[1] 姚洪[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2017年第1期123-127,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51476066);国家重点基础研究发展计划资助项目(2016YFB0600600)

摘　　要：为了确定煤中汞的赋存形态,基于两种典型的煤中汞的化学逐级提取方法,提出了一种改良的化学逐级提取方法.采用多种动力煤和焦煤对此方法进行验证,结果表明:两种典型的化学逐级提取方法对煤中汞的回收率偏低,大部分煤中汞回收率都低于90%;改良后的化学逐级提取方法能明显提高煤中汞的回收率,煤中汞的回收率高于90%,逐级提取到的各种形态的汞含量累加与样品中汞总量基本一致.化学逐级提取结果还表明:汞在煤中的赋存形态主要以硅铝酸盐结合态和硫化物结合态为主,有机质结合态次之,仅有少量以离子结合态存在.In order to understand the occurrence of mercury in coal,two typical sequential selection extraction（SSE）methods of mercury in coal were used.And verified this method by using a variety of power coal and coking coal.The experimental results show that Hg recovery efficiency by the two typical SSE methods is below 90%.However,a new proposed SSE method could improved the recovery rate of mercury in coal obviously,Hg recovery efficiency was increased to above 90%.Various forms of mercury content accumulation by SSE is consistent with the total mercury in sample basically.At the same time,it was found that most of Hg in coal was aluminosilicate bound mercury（HgAl-Si）and sulfide bound mercury（Hg-S）,small amounts of Hg were organic chelating bound mercury（Hg-O）and ionic mercury in coal（Hg-ion）.

关 键 词：煤 汞 赋存形态 化学逐级提取 回收率 

分 类 号：TK16[动力工程及工程热物理—热能工程]