Trace metal content of coal and ash as determined using scanning electron microscopy with wavelength-dispersive spectrometry
- Univ. of North Dakota, Grand Forks, ND (United States)
Scanning electron microscopy with wavelength-dispersive spectrometry has been used to measure trace metals in coal and ash. Hg, As, Ni, and Se have been detected in individual pyrite grains in Illinois No. 6 coal at levels up to 2680 ppm, 410 ppm, 320 ppm, and 880 ppm, respectively. These elements were present in fewer than half the grains analyzed. Cr has been detected at up to 950 ppm in half of clay mineral grains analyzed in Illinois No. 6 coal. The same trace metals were detected in pyrite and clay grains from Pittsburgh No. 8 coal. Ash samples show a similarly heterogeneous distribution of trace metals. Hg has been detected at up to 700 ppm in 24% of aluminosilicate particles analyzed in ash from Absaloka coal, a subbituminous Montana fuel. These data confirm that coal cleaning processes which remove pyrite are likely to be suitable for trace metal emissions control. In addition, back-end control devices which target specific types of ash particles may be helpful for control of air toxics emissions.
- OSTI ID:
- 460101
- Report Number(s):
- CONF-950801--
- Journal Information:
- Preprints of Papers, American Chemical Society, Division of Fuel Chemistry, Journal Name: Preprints of Papers, American Chemical Society, Division of Fuel Chemistry Journal Issue: 4 Vol. 40; ISSN ACFPAI; ISSN 0569-3772
- Country of Publication:
- United States
- Language:
- English
Similar Records
Toxic substances from coal combustion -- Forms of occurrence analyses. Technical progress report, April 30--November 1, 1996
Toxic substances from coal combustion - forms of occurrence analyses. Semi-annual report, April 30, 1996--November 1, 1996