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Thermomechanical Method for Secondary Breakage of Hard Rocks.

Authors
Thirumalai-K; Demou-SG; Fischer-RL
Source
NTIS: PB 244 371 :9 pages
Link
NIOSHTIC No.
10007629
Abstract
The feasibility of breaking hard rock by thermal weakening and subsequent mechanical impacting was tested. Field tests at a basalt quarry in Dresser, Wisconsin, demonstrated that large hard-rock blocks (5 by 5 by 5 ft) could be effectively reduced in size by this method. A series of secondary breakage tests, using air-propane heating, resulted in an average heating cost of $0.36 Per ton. This combination energy approach provides an alternate means of size reduction of large hard-rock boulders for quarry and for underground ore chute and grizzly operations where mechanical methods, used alone, are ineffective.
Publication Date
19750101
Document Type
IH; Report of Investigation;
Fiscal Year
1975
NTIS Accession No.
PB-244371
NTIS Price
A02
Identifying No.
RI 8057
Source Name
NTIS: PB 244 371
State
WI;
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division