Page 145 - Advanced Mine Ventilation

126 Advanced Mine Ventilation

Table 9.1 Rank and Location of Coals Studied

Sample Number Rank Seam Name Locality
1 Anthracite Buck Mountain Zerbe, Pennsylvania
2 Anthracite Buck Mountain Zerbe, Pennsylvania
3 Anthracite #8-1/2 Seam Shamokin, Pennsylvania
*
4 High Vol. A Bit . Elkhorn#3 Deane, Kentucky
5 High Vol. A Bit. Elkhorn#3 Deane, Kentucky
6 High Vol. A Bit. Elkhorn#3 Deane, Kentucky
7 High Vol. A Bit. C. seam Benham, Kentucky
8 High Vol. A Bit. Pittsburgh Marianna, Pennsylvania
9 High Vol. A Bit. Pittsburgh Marianna, Pennsylvania
10 High Vol. A Bit. Tioga Tioga, West Virginia
11 High Vol. A Bit. #5 Seam Bickmore, West Virginia
12 HVB, Bit. #2 Colchester Vermont, Illinois
13 HVC, Bit. Illinois No. 6 Carrier Mills, Illinois
14 Sub. Bit. Monarch Sheridan, Wyoming
15 Low Vol. Bit. Lower Kittanning Ebensburg, Pennsylvania
16 Med. Vol. Bit. Pocahontas#3 Gary, West Virginia
17 Lignite Zap Zap, North Dakota
18 Lignite Zap Zap, North Dakota

*
Bit means Bituminous.
*HV means high-volatile.
seam names are given in Table 9.1. The samples were, originally, collected by the
organic sediment laboratory, Pennsylvania State University and crushed and sieved
to obtain minus 20 mesh particles. This undersize is preserved in vacuum sealed cans.
Table 9.2 shows their chemical and petrological properties. Samples for the purpose
of this study were prepared from these by resieving them to obtain a closely sized frac-
tion between 20-mesh (833 mm) and 28-mesh (589 mm) Tyler screens. This closely
sized sample was then ground in a Bleuler rotary mill.

9.2.1 Bleuler Rotary Mill

A schematic view of the Bleuler rotary mill is shown in Fig. 9.2. In this mill, an eccen-
tric shaft is driven by a heavy duty enclosed motor. The shaft actuates a flywheel,
which makes the upper chamber assume a rotary motion. The sample container, C,
is clamped to the chamber wall and contains a heavy cylindrical weight, W, and an