Characterization of Hg in Coals by Temperature-Programmed Decomposition–Atomic Fluorescence Spectroscopy and Acid-Leaching Techniques
2012
Guo, Shaoqing | Yang, Jianli | Liu, Zhenyu
Mercury (Hg) is a volatile and toxic trace element in coal. Its emission to the environment can cause long-term contamination problems to human health and the environment. In this study, Hg in six Chinese coals from different ranks was characterized by temperature-programmed decomposition–atomic fluorescence spectroscopy (TPD–AFS) and acid-leaching techniques. The results show that TPD–AFS is an effective method to assist the characterization of Hg in coals. With the aid of acid leaching, the thermal behavior of the grouped Hg-containing components can be obtained. Generally, the content of organic-bound Hg is in the range of 16–36% and releases in the temperature range of 220–600 °C. The content of silicate-bound Hg is in the range of 10–26% and releases in the temperature range of >600 °C. The content of pyrite-bound Hg is in the range of 5–44% and releases in the temperature range of 250–630 °C. The content of HCl-soluble Hg is in the range of 10–34% and releases at the lower temperature range. The thermal behavior of Hg from the coals tested shows a certain dependency upon coal rank.
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