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Which is the More Efficient Rock Breaker (No replies)
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If you would like to know what is the More Efficient Rock Breaker? Bond, F. C. Engng Min. 1954, 155 (1), 82. From data put forward in Rep. Invest. U.S. Bur. Min. No. 4918 (Venon C. Davis), Taconite Fragmentation, June 1953, it is possible to compare efficiencies of breaking, explosive v. machine. From calculations based on work index figures. Bond finds the mechanical efficiencies of breaking by crushing and blasting are approximately equal. Size reduction in an installed crusher costs less than by explosives, since the cost of a kWh in dynamite is far more than a kWh in electricity. But finer quarry breakage by explosives may decrease the size and cost of crusher installation. Although the absolute mechanical efficiencies of rock breaking are still obscure, the evidence favours higher values since it is difficult to believe that the efficiency of planned blasting can be less than 1%. 3 refs.
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