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Thermomechanical Method for Secondary Breakage of Hard Rocks.
Thirumalai-K; Demou-SG; Fischer-RL
NTIS: PB 244 371 :9 pages
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.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 244 371
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division