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A Comparison of Borer, Ripper, and Conventional Mining Products in Illinois No. 6 Seam Coal.

Authors
Schmidt-RL; Engelmann-WH; Fumanti-RR
Source
NTIS: PB 213 952 :18 pages
Link
NIOSHTIC No.
10001737
Abstract
The methane control and the respirable dust groups at the Twin Cities Mining Research Center (TCMRC) cooperated recently in obtaining production samples of approximately 1 ton each, from the loading conveyors of a ripper, a borer, and a loading machine in conventional development headings. These samples were sized, in four stages, from plus 4 in to minus 10 um. The conventional product had the least fines of the three production methods. The borer product had more fines than did the ripper product, but it also had a greater amount of large pieces. All three products, as sampled, had essentially the same amount of minus 10-um particles. Photomicrographs and surface-area comparisons were made. Gas- adsorption, surface-area determinations on particles under 37 um give essentially the same value. Surface-area calculations, assuming spherical particles and no porosity, give a smaller area to the conventional product.
Publication Date
19720101
Document Type
IH; Report of Investigations
Fiscal Year
1972
NTIS Accession No.
PB-213952
NTIS Price
A03
Identifying No.
RI 7687
NIOSH Division
TCRC;
Source Name
NTIS: PB 213 952
State
IL;
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