Abstract:Pyrolysis experiments were carried out in a box resistance reactor at 300~1200℃ to evaluate the volatility of trace elements in the coal from southwestern Guizhou. The impact of pyrolysis temperature, mode of element occurrence and ash content of coal on trace elements release were investigated. Coal weight loss and trace element volatility were primarily affected by pyrolysis temperature. As and Mo showed an strong release when temperature was higher than 900℃. Pb showed a high volatility at the early stage of pyrolysis(< 450℃), and then a lower volatility when temperature was over 450℃. With the increase of pyrolysis temperature, the volatility of Sb increased gradually. The volatility of trace elements showed a close correlation with the mode of element occurrence. Trace element of organic phase was most labile, while trace element of sulphide phase and carbonate phase volatilized gradually at the late stage of pyrolysis owing to the decomposition of mineral. Silicate phase was most stable, and basically remained in the ash. A high ash content of coal usually corresponded to a low volatility of trace elements.
魏晓飞, 张国平, 李玲, 项萌, 蔡永兵. 黔西南高砷煤热解过程中微量元素释放规律研究[J]. 中国环境科学, 2011, 31(12): 2005-2012.
WEI Xiao-Fei, ZHANG Guo-Ping, LI Ling, XIANG Meng, CAI Yong-Bing. Volatility of trace elements during pyrolysis of high arsenic coal from southwestern Guizhou.. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(12): 2005-2012.