Production of Superclean Coal by WetGrinding and Selective Мб. coal to 10 mesh, (2) use concentrating table to remove pyrite and other minerals, (3) wet grind coal to an ultrafine particle size to liberate coal from pyrite and of otherChlorine reduction from coal by wetgrinding was investigated using sample IBC1 09 ( ash, 1 .13% sulfur, and % chlorine).