Abstract

FANG, H.Y.; YANG, J.H.  and  CHEN, Q.. Particle size distribution and energy consumption during impact crushing of single granite particles. J. S. Afr. Inst. Min. Metall. [online]. 2018, vol.118, n.5, pp.555-561. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2018/v118n5a12.

To study the effects of crushing parameters on particle size distribution and energy consumption of rock impact crushing, a custom-made experimental rig was used for impact crushing tests on single particles of granite. The particle size distribution of the crushed product was analysed, as well as the sand production ratio and energy consumption per unit sand product under different impact velocities and with different primary particle sizes. The results show that the particle size distribution of the crushed granite under different experimental parameters is in accordance with the Weibull distribution. With a decrease in the primary particle size, or a specified impact velocity, the discreteness of the particle size distribution of the fragments becomes greater. An optimal impact velocity exists at which the energy consumption per unit sand product is minimized. Also, it was found that the smaller the primary particle size, the lower the energy consumption per unit sand produced.

Keywords : granite; single-particle impact crushing; impact velocity; primary particle size; particle size distribution; specific energy consumption.

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