Single-impact rock crushing experiment

Authors: Simonov P. S.

The effect of the specific impact energy on the grain size composition of crushed rocks is studied. It is shown that the experimental curves of the grain size content can be well described by the power-series distributions. The test results are presented in the form of the plotted distribution versus the specific impact energy. It is found that with increasing specific impact energy, the initial lump is crushed into a certain number of fragments and the fragmentation degree grows. At the same time, the fragmentation degree growth is not linear as follows from Rittinger’s law but decelerates with increasing specific energy of impact. This is connected with an increase in the irreversible loss of energy, i.e. with energy dissipation at the higher loading rate. Probable periodic behavior is noticed in destruction of rocks by the cycle of increment of defects–opening of defects on various scales. Thus, high values of the specific energy intake are not always expedient and lead to considerable loss of energy and decreased efficiency of crushing. In laboratory tests of rock crushing by drop hammer, it is possible to determine the optimal specific energy such that ensures the preset grain size composition of crushed products.

Keywords: Impact, lump, grain size composition, specific energy, optimization, rock crushing, mineral processing, rock blasting.
For citation:

Simonov P. S. Single-impact rock crushing experiment. MIAB. Mining Inf. Anal. Bull. 2020;(1):71-79. [In Russ]. DOI: 10.25018/0236-1493-2020-1-0-71-79.

Issue number: 1
Year: 2020
Page number: 71-79
ISBN: 0236-1493
UDK: 622.23.01:622.235
DOI: 10.25018/0236-1493-2020-1-0-71-79
Article receipt date: 29.07.2019
Date of review receipt: 07.11.2019
Date of the editorial board′s decision on the article′s publishing: 20.12.2019
About authors:

P. S. Simonov, Cand. Sci. (Eng.), Assistant Professor,
G.I. Nosov Magnitogorsk State Technical University,
455000, Magnitogorsk, Russia, e-mail:

For contacts:

P. S. Simonov, e-mail:


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