No.74 無灰炭製造プロセスにおける水銀分配挙動と存在形態(灰・微量金属(3))

概要

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Ash-free coal process based on the organic solvent extraction of a coal has been developed in order to remove ash. This ash-free coal called Hyper Coal (HPC) is expected to include less hazardous heavy metals, such as mercury, arsenic and selenium, by the organic solvent extraction. Therefore, it is important to understand the distribution behavior of these heavy metals in this process. In particular, emission of mercury to the atmosphere in coal combustion processes has been becoming one of the most major sources of human-induced mercury emission. The distribution behavior of mercury in the HPC production was investigated in this study. By measuring the distribution behavior for the four coals with different locality, mercury distribution behavior from the raw coals to the corresponding HPCs was significantly different although mercury concentration values in the HPCs were very similar. In order to make clear the mercury behavior in detail, the mode of occurrence in these coals was investigated by using reported selective leaching procedure.
2009-11-26