XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 3733
chambers are connected at the centre discharge cone, so
that slurry collected in each chamber gets combined and
discharged through each discharge cone.
Figure 2 shows typical surface used in this simulation
work. A fine surface fine mesh (Figure 2b) is adapted in the
grate region concentrated around the grate aperture region
so that 14×11mm apertures are captured accordingly. This
kind of resolution will help capture flow in and around the
grate apertures and pulp lifter chambers accurately. Which
will intern help review design and the performance of
the design.
OPERATING CONDITIONS
This mill operates at 19% filling and is driven by a
1500 kW fixed-speed motor running on average at 12.42
rpm (i.e., 75.2% critical speed). Balls with up to 125mm
(15% filling) are used to reduce a feed size nominally pass-
ing of 80 mm. The mill feed and discharge particle size
(PSD) were measured and used in a JKSimMet simulation
to predict the mill contents PSD. The resulting PSDs are
represented in Figure 3a. In the present study, the com-
minution process was disregarded and the JKSimMet PSD
was considered on both initial load and feed.
Figure 2. SAG Mill surface mesh (a) feed-end (c)mesh around the feed apertures
Figure 3. (a) Measured Feed and Discharge PSDs are depicted in comparison with JKSimMet prediction. (b) Resulting
simulation PSD to be solved explicitly by the DEM method
chambers are connected at the centre discharge cone, so
that slurry collected in each chamber gets combined and
discharged through each discharge cone.
Figure 2 shows typical surface used in this simulation
work. A fine surface fine mesh (Figure 2b) is adapted in the
grate region concentrated around the grate aperture region
so that 14×11mm apertures are captured accordingly. This
kind of resolution will help capture flow in and around the
grate apertures and pulp lifter chambers accurately. Which
will intern help review design and the performance of
the design.
OPERATING CONDITIONS
This mill operates at 19% filling and is driven by a
1500 kW fixed-speed motor running on average at 12.42
rpm (i.e., 75.2% critical speed). Balls with up to 125mm
(15% filling) are used to reduce a feed size nominally pass-
ing of 80 mm. The mill feed and discharge particle size
(PSD) were measured and used in a JKSimMet simulation
to predict the mill contents PSD. The resulting PSDs are
represented in Figure 3a. In the present study, the com-
minution process was disregarded and the JKSimMet PSD
was considered on both initial load and feed.
Figure 2. SAG Mill surface mesh (a) feed-end (c)mesh around the feed apertures
Figure 3. (a) Measured Feed and Discharge PSDs are depicted in comparison with JKSimMet prediction. (b) Resulting
simulation PSD to be solved explicitly by the DEM method