XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 2045
Also, in Figure 10, in the first deck section, the model
predicts the bed depth accurately, but on the next sections,
due to the lower throughput than in 1998s test, it predicts
the bed depth to be higher. The actual passage layer remains
practically at the same level during the screening.
0
50
100
150
200
250
300
350
0 1000 2000 3000 4000 5000 6000
Length (mm)
Throughput rate
Model Screen length Test
Figure 9. The compared throughput rates in the test 21 (mica-gneiss rock, 0/65 mm material, 452 t/h, moisture 5.7% for the
0/12.7 mm material, aperture size 24.7 mm for the first two sectors and 21.8 mm for the last sector of the deck, screen effective
screening area length 5170 mm)
CONCLUSIONS
The passing probability model was developed in Excel to
select appropriately sized apertures for the screen deck. The
model was initially presented by Metsälä in 2008, and it
0
20
40
60
80
100
120
140
160
0 1000 2000 3000 4000 5000 6000
Length (mm)
Bed depth
Model BD Model Apl Screen length Test
Figure 10. The compared material bed depths in test 21 (mica-gneiss rock, 0/65 mm material, 452 t/h, moisture 5.7% for the
0/12.7 mm material, aperture size 24.7 mm for the first two sectors and 21.8 mm for the last sector of the deck, screen effective
screening area length 5170 mm)
Through
pu t
(t/h)
Height
(mm)
Also, in Figure 10, in the first deck section, the model
predicts the bed depth accurately, but on the next sections,
due to the lower throughput than in 1998s test, it predicts
the bed depth to be higher. The actual passage layer remains
practically at the same level during the screening.
0
50
100
150
200
250
300
350
0 1000 2000 3000 4000 5000 6000
Length (mm)
Throughput rate
Model Screen length Test
Figure 9. The compared throughput rates in the test 21 (mica-gneiss rock, 0/65 mm material, 452 t/h, moisture 5.7% for the
0/12.7 mm material, aperture size 24.7 mm for the first two sectors and 21.8 mm for the last sector of the deck, screen effective
screening area length 5170 mm)
CONCLUSIONS
The passing probability model was developed in Excel to
select appropriately sized apertures for the screen deck. The
model was initially presented by Metsälä in 2008, and it
0
20
40
60
80
100
120
140
160
0 1000 2000 3000 4000 5000 6000
Length (mm)
Bed depth
Model BD Model Apl Screen length Test
Figure 10. The compared material bed depths in test 21 (mica-gneiss rock, 0/65 mm material, 452 t/h, moisture 5.7% for the
0/12.7 mm material, aperture size 24.7 mm for the first two sectors and 21.8 mm for the last sector of the deck, screen effective
screening area length 5170 mm)
Through
pu t
(t/h)
Height
(mm)