Use of an in-seam tester to determine effects of bit type on primary dust generation. Report of Investigations/1989

Technical Report · Sun Jan 01 04:00:00 EST 1989

OSTI ID:7082680

Sundae, L S

A U.S. Bureau of Mines designed and fabricated in-seam tester (IST), retrofitted with a dust shroud, was used to establish a respirable dust index (RDI) and to determine cutting forces from a variety of bit types in four coal mines and a salt mine. Results from cutting tests at four coal mines showed that radial bits required the lowest cutting force and the least specific energy. Generally, for each conical bit the RDI and cutting force increased when the included bit tip angles increased from 70 degrees to 90 degrees. During field tests it was not possible to measure the total quantity of respirable dust produced by each cut; therefore; attempts were made to determine the amount of dust that became airborne from each test cut. The test results show that the quantity of airborne respirable dust is very erratic and cannot be related to bit type. Two statistical methods were employed to analyze RDI, but no correlation was found between the RDI and bit type. Despite scatter in test results for RDI, significant difference was found in RDI generated in four coal seams. In general, RDI increased with the increased cutting force for each coal seam from mine 1 through mine 4.

• Research Organization: Bureau of Mines, Twin Cities, MN (USA). Twin Cities Research Center
• OSTI ID: 7082680
• Report Number(s): PB-90-157462/XAB; BUMINES-RI--9263
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010900* -- Coal
Lignite
& Peat-- Environmental Aspects
54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION ABATEMENT
COAL MINES
COAL MINING
CUTTING TOOLS
DRILL BITS
DRILLING EQUIPMENT
DUSTS
EQUIPMENT
MINES
MINING
PARTICLES
PARTICULATES
POLLUTION ABATEMENT
PORTABLE EQUIPMENT
RETROFITTING
TOOLS
UNDERGROUND FACILITIES