3762 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
Results for the Curved Discharge System
Seven simulations with the same initial conditions as for
the radial designs were carried out for the curved lifters.
Three snapshots from Curved1, Curved4 and Curved7 are
shown in Figure 7.
The snapshots show that the slurry is flowing out of
the mill through the grates positioned mainly in the same
range 8 o’clock to 10 o’clock like in the radial case. There
is no slurry discharge for the Curved7 design, again similar
to the Radial7 case. On the other hand, it looks like the
Curved1 design provides a larger discharge rate compared
to Radial1.
The discharge rates and the inwards and outwards flow
rates for the curved design are plotted in Figure8.
The curved design shows the same trend in terms of
discharge rates versus radial position of the grates, namely
a reduction in the discharge rates as the slots are moving
towards the center of the mill. For the most radial inner
position of the slots, the slurry discharge rate is close to
zero similar to the radial design for the same position of the
holes. However, the curved design seems to discharge more
Figure 6. Discharge Rate, Inwards and Outwards flow rates and holdups for radial case
Table 4. Discharge rates vs. net flow through the grates for the radial cases
Sim
Slurry Solids
Discharge
m3/h
Net Flow
m3/h
Diff
%
Discharge
t/h
Net Flow
t/h
Diff
%
Radial1 459.270 451.645 –1.66 887.093 872.832 –1.61
Radial2 336.437 334.467 –0.59 669.240 674.608 0.80
Radial3 225.683 220.279 –2.39 483.394 484.152 0.16
Radial4 124.236 123.106 –0.91 308.303 313.601 1.72
Radial5 60.861 62.076 2.00 188.542 194.452 3.13
Radial6 11.407 11.557 1.31 99.828 94.503 –5.33
Radial7 0.045 0.070 55.56 50.816 44.993 –11.46
Results for the Curved Discharge System
Seven simulations with the same initial conditions as for
the radial designs were carried out for the curved lifters.
Three snapshots from Curved1, Curved4 and Curved7 are
shown in Figure 7.
The snapshots show that the slurry is flowing out of
the mill through the grates positioned mainly in the same
range 8 o’clock to 10 o’clock like in the radial case. There
is no slurry discharge for the Curved7 design, again similar
to the Radial7 case. On the other hand, it looks like the
Curved1 design provides a larger discharge rate compared
to Radial1.
The discharge rates and the inwards and outwards flow
rates for the curved design are plotted in Figure8.
The curved design shows the same trend in terms of
discharge rates versus radial position of the grates, namely
a reduction in the discharge rates as the slots are moving
towards the center of the mill. For the most radial inner
position of the slots, the slurry discharge rate is close to
zero similar to the radial design for the same position of the
holes. However, the curved design seems to discharge more
Figure 6. Discharge Rate, Inwards and Outwards flow rates and holdups for radial case
Table 4. Discharge rates vs. net flow through the grates for the radial cases
Sim
Slurry Solids
Discharge
m3/h
Net Flow
m3/h
Diff
%
Discharge
t/h
Net Flow
t/h
Diff
%
Radial1 459.270 451.645 –1.66 887.093 872.832 –1.61
Radial2 336.437 334.467 –0.59 669.240 674.608 0.80
Radial3 225.683 220.279 –2.39 483.394 484.152 0.16
Radial4 124.236 123.106 –0.91 308.303 313.601 1.72
Radial5 60.861 62.076 2.00 188.542 194.452 3.13
Radial6 11.407 11.557 1.31 99.828 94.503 –5.33
Radial7 0.045 0.070 55.56 50.816 44.993 –11.46