Trace elements in coal: Modes of occurrence analysis. Technical progress report, October 5, 1995--March 31, 1996
Description: CQ, Inc. proposed to quantify the relationship between the modes of occurrence of twelve trace hazardous air pollutants (HAP`s) elements in coal and the degree that each element can be removed by existing and advanced physical and chemical coal cleaning processes. They also proposed to investigate new chemical and biological trace element removal processes, and estimate the concentration and stability of trace elements in coal preparation plant tailings. The ultimate goal of this effort is to produce a software tool that will predict the most amenable integration of processes for select trace element emissions control. In support of this effort, the USGS is performing trace element modes of occurrence analyses on coal samples provided by CQ, Inc. The objective of this work to determine the modes of occurrence of as many as twelve trace HAP`s elements in coal. The HAP`s elements can occur in coal in numerous forms. For example, antimony is generally thought to be present in pyrite, accessory sulfides such as stibnite, and possible organically bound; arsenic is primarily associated with late-stage (epigenetic) pyrite; cadmium with sphalerite; chromium may be organically bound, associated with clays, or contained in chromium-bearing mineral; mercury is thought to occur predominately in epigenetic pyrite; and selenium may be organically bound or associated with pyrite or accessory minerals such as clausthalite and galena. Phase I Characterization of four coals is progressing satisfactorily. One round of selective leaching has been completed, the second is underway. Four samples have been submitted for bulk chemical analysis. SEM and microprobe analysis have been started. Preliminary data are presented in this report.
Date: October 1, 1996
Creator: Palmer, C.A.; Findelman, R.B.; Belkin, H.E. & Crowley, S.S.
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