Crushing of Mineral Particles by Control of Their Kinetic Energy

Abstract

The present paper studies the energy size relationship
of minerals using a specially designed centrifugal crusher with
rotation frequency control. The feed particles are accelerated by
the rotating disc of the crusher and they crush on the opposite
vertical wall having the predetermined specific kinetic energy.
The mathematical modelling shows that the specific energy,
energy per unit mass of the particles, is independent of their mass
and is calculated to depend on the rotation frequency and the
disc diameter. Crystalline limestone, marly limestone and
serpentine samples are tested. The results obtained are used to
present the energy–size relationship and to compare the crushing
amenability of the rocks tested. A suggestion for further study is
to derive the mathematical model of the breakage curves and to
calculate the breakage energy for each size class using the model
to be proposed.