Estimate of Known Recoverable Reserves and the Preparation and Carbonizing Properties of Coking Coal in Overton County, Tennessee Page: 21
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21
CARBONIZING PROPERTIES OF OVERTON COUNTY COAL
Two samples of Wilder-bed coal were collected to study their carbonizing prop-
erties. Channel samples representing the full thickness of minable coal in the bed
were taken in the mines under the supervision of Bureau of Mines engineers. These
samples, which weigh about 600 pounds each, were transported to the Bureau's Central
Experiment Station, Pittsburgh, Pa., in steel drums and prepared for carbonization
tests by crushing in the hammer mill. The source of the samples is shown below (see
fig. 1):Coal No. Bed
638
639Mine
Town County
Wilder Hite Twint own Overton
do. Pine Ridge (strip) Obey City Do.Chemical Composition of Wilder Bed
Table 12 gives chemical analyses, heating value, softening temperature of ash,
free-swelling index, agglutinating value, and expansion of coals carbonized. Both
ranked as high-volatile-A bituminous because they contained 57.0 and 57.5 percent
dry, mineral-matter-free fixed carbon, and their heating values on the moist, min-
eral-matter-free basis exceeded 14,000 B.t.u. per pound. They contain relatively
high proportions of ash, and their sulfur content (3.1 percent) is excessively high
for metallurgical use, by present standards. Results of miscellaneous tests show
free-swelling indexes of 4-1/2 and 5-1/2, agglutinating values at the 15:1 ratio of
silicon carbide to coal of 8.5 and 8.2, and ash-softening temperatures of 2,3100
and 2,0700 F.
TABLE 12. - Chemical analyses, free-swelling index, agglutinating value,
and expansion of coals
Coal No. .......................................................... 638 639
Dry, mineral-matter-free fixed carbon .................... percent 57.0 57.5
Moist, mineral-matter-free heating value ......... B.t.u. per lb. 14,550 14,860
Proximate analysis of coal, percent:
Moisture ......................... ................................. 3.1 2.6
Volatile matter ................................................ 38.0 37.8
Fixed carbon ................................................. 48.5 49.4
Ash ........................................................... 10.4 10.2
Ultimate analysis of coal, percent:
Ash ........................................................... 10.4 10.2
Hydrogen ................ ................................. 5.2 5.2
Carbon ....................................................... 70.7 72.6
Nitrogen ...................................................... 1.3 1.3
Oxygen .......................... ....... .............. 9.3 7.6
Sulfur ........................................................ 3.1 3.1
Softening temperature of ash ................................. OF. 2,310 2,070
Free swelling index .........................................4-1/2 5-1/2
Agglutinating value, silicon carbide - coal ratio 15:1 ........... 8.5 8.2
Expansion ................................................ percent -5.0 -8.0The carbonizing properties were determined by the Bureau of Mines-American Gas
Association (BM-AGA) method; duplicate tests were made in the standard 18-inchCarbonizing Properties Determined by the BM-AGA Method
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Williams, Lloyd; Abernethy, R. F.; Gandrud, B. W.; Reynolds, D. A. & Wolfson, D. E. Estimate of Known Recoverable Reserves and the Preparation and Carbonizing Properties of Coking Coal in Overton County, Tennessee, report, May 1955; [Washington D.C.]. (https://digital.library.unt.edu/ark:/67531/metadc38623/m1/31/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.