Trace elements in coal - model of occurrence analysis
Technical Report
·
OSTI ID:600583
The overall objective of this project is to provide modes of occurrence information for the CQ Inc. (CQ) effort being performed under DOE Contract No. DE-AC22-95PC95153, entitled `HAPs-R{sub x} : Precombustion Removal of Hazardous Air Pollutant Precursors`. This work attempt to provide semi-quantitative data on modes of occurrence of 15 elements. Coals investigated include as-mined coals and cleaned fines from the Northern Appalachian and Southern Appalachian, and Eastern Interior coal regions, and as-mined and natural fines from the Powder River Basin. Study techniques include scanning electron microscopy, electron microprobe analysis, and leaching procedures. Microprobe data indicate that pyrite grains in the Northern Appalachian, Eastern Interior and Powder River Basin coals and most of the pyrite grains in the Southern Appalachian coal contain low As concentrations, generally in the 100-500 ppm range. However, the Southern Appalachian coal contains some pyrite grains with much higher As contents, in excess of 4.0 wt. percent As. Microprobe analyses and data from leaching experiments indicate that arsenic is primarily associated with pyrite in the bituminous coals. These techniques also indicate that Cr is primarily associated with illite. Other HAP`s elements have multiple associations.
- Research Organization:
- Geological Survey, Reston, VA (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
- DOE Contract Number:
- AI22-95PC95156
- OSTI ID:
- 600583
- Report Number(s):
- DOE/PC/95156--T2; ON: DE97054351
- Country of Publication:
- United States
- Language:
- English
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