Utilizing primarily instrumental neutron activation analysis (INAA) and other analytical methods 'as many as 61 elements were quantitatively surveyed in 170 U.S. whole coals, 70 washed coals, and 40 bench samples. Data on areal and vertical distributions in various regions were obtained along with extensive information on the mode of occurrence of various elements in the coal matrix itself.
A pre-combustioncoal desulfurizationprocess at 120_C using perchloroethylene (PCE)to remove up to 70_ of the organic sulfur has been developedby the Midwest Ore Processing Co (_OPC) However this processhas not _,:tproven to be as successful with illinois coals as 'it has for Ohio and ,,,dlanacoals, In addition, the high levels of organic sulfur removalsobserved by the MWOPC may be due to certain _rrors involved in the ASTM data interpretation;this needs verification. For example, elementalsulfur extractedby the PCEmay bP derived from pyrite oxidation during coal pre-oxidation,but lt may be interpretedas organic sulfur removed by the PCE using ASTM analysis.
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