1982 Volume 8 Issue 6 Pages 710-716
Impact crushing experiments with single irregularshaped particles made of five kinds of minerals having a size range of 0.95-3.9 cm was carried out by use of a double-pendulum impact testing apparatus.
The experimental results are summarized as follows : 1) The experimental relationship between specific fracture energy and impact energy was similar to the theoretical one derived from the theory of impact between two elastic bodies under the condition that the particle is not fractured. But specific fracture energies were less than the values calculated from the theoretical equation. 2) The experimental relationship between impulse and specific fracture energy was in good agreement with the theoretical one. 3) By the use of volume equivalent particle diameter as a characteristic particle size of irregular particles, the experimental relationships 1) and 2) mentioned above were both in fair agreement with those obtained by using spherical particles. 4) Size distributions of fractured products were represented by the GM-H size distribution equation. And new surface produced was increased with increasing impact energy. 5) The energy law was similar to the final fineness limit theory proposed by T.Tanaka. 6) Crushing efficiency of a irregular-shaped particle was better than that of a spherical particle in the range of large impact energy.