3774 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
not wholly due to lifter profile, but a combination of lifter
configuration and mill size.
The effect of mill diameter can also be seen from
Figure 5 and 6. Reducing the ball top-up size in a small
mill results in a notable increase on the peak power, whereas
in large mills the effect is less. The observation suggests an
improvement of grinding efficiency brought by the use of
small balls may be damped in large mills because of a wide
spread of the collision energy spectra, but this can be ben-
eficial for dealing with variations in feed hardness and size
distribution.
Figure 7. Spatial maps of power dissipation in 1.8 m Ø mill, (left) shear power and
(right) impact power
not wholly due to lifter profile, but a combination of lifter
configuration and mill size.
The effect of mill diameter can also be seen from
Figure 5 and 6. Reducing the ball top-up size in a small
mill results in a notable increase on the peak power, whereas
in large mills the effect is less. The observation suggests an
improvement of grinding efficiency brought by the use of
small balls may be damped in large mills because of a wide
spread of the collision energy spectra, but this can be ben-
eficial for dealing with variations in feed hardness and size
distribution.
Figure 7. Spatial maps of power dissipation in 1.8 m Ø mill, (left) shear power and
(right) impact power