Dry Preparation of Bituminous Coal At Illinois Mines

Cover Dry Preparation of Bituminous Coal At Illinois Mines
Dry Preparation of Bituminous Coal At Illinois Mines
Elmer Allen Holbrook
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31.
112 ILLINOIS ENGINEERING EXPERIMENT STATION Mine Run Coal shall not contain more than 30 per cent screen- ings through 1-inch diamond bar screen, but shall contain more than 30 per cent of 5-inch bar screen lump or more than 40 per cent of 7-inch round hole screen lump.
The recommendations also included the use of relief screens to prevent overcrowding of the fine screens, and specified a minimum area for screens making the different sizes. Although favored by the convention in question the
... provisions have not been adopted by the railroads.
"In 1903 the operators in Williamson county, Illinois, adopted the following standard of sizes for washed coal. The numbers used refer to screens with round perforations. "* has not been maintained in all cases.
This standardization Designation Through Over No. 1 3 in.
1% in.
No. 2 . . .
1% in.
1 in.
No. 3 .
1 in.
% in.
No 4 % in.
14 in No 5 y 4 in.
Standardization means little to the small consumer, whose aggregate consumption, however, forms a considerable percentage of the coal produced.


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