The advanced removal of mercury was performed by use of chelating agent-extraction or mild pyroloysis. When sulfur-containing chelating agents, such as dimercaptosuccinic acid and mercaptopropionic acid, were used in the extraction for SS004.44-57% of mercury was extracted to the aqueous solution. The mild pyrolysis of coal at 300-400℃ resulted in the removal of 70-80% of Hg for SS004 coal, whereas the removal efficiency was greatly dependent on the coal brand.
