Trace Elements in Coal:Occurrence and Distribution.

摘要

The report gives results of chemical analyses of whole coal samples,bench samples (vertical),and washed coal samples. Most of the samples were from the Illinois Basin,but other U.S. coal producing areas are also represented. In addition to the standard analyses of coal parameters,approximately 60elements were also analyzed. Statistical analysis of the whole coal samples data indicates that elemental concentrations tend to decrease from the Eastern to Western coals:elements with the greatest variation are identified with the discrete mineral matter;those with the least,with the organic matter. The bench samples indicated wide variations in elemental concentrations within a single coal seam:the greatest differences were found in the top and bottom of the seam. The trace elements were classified into four organic affinity groups,based on the analytical data:organic,intermediate-organic,intermediate-inorganic,and inorganic.