METHOD TO UPGRADE LOW RANK COAL STOCKS

摘要

The ash content of raw coals, lignite, and other carbonaceous materials is reduced by leaching the high­ash material with an aqueous acidic waste product produced by a Fischer-Tropsch reaction. The acidic aqueous waste is mixed with coal and process conditions are described. The claim takes advantage of using otherwise uneconomic coal, lignite or other carbonaceous material by upgrading the material to a suitable feedstock for combustion in a power plant or gasifier.