Download - Ball Charge Design
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Ball Charge Design Methods
Grinding Course
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Ball Charge Design Methods
• Polysius for Finish Mills A formula that covers the entire mill as though it is a
single compartment mill.
• Slegten For Finish Mills Rules for 1st Compartment and “Transition Zone” Formula for Remainder of 2nd Compartment
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Polysius Ball Charge for Finish Mills
xeD 13.96
D = Ball Diameter , mm
X = Distance From Feed End of Mill, m
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Polysius Ball Charge Design
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
110.00
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Distance From Feed End of Mill, m
Bal
l Dia
met
er, m
m
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Ball Sizes
0.6250.6316
0.750.7920
10.9825
1.251.1830
1.51.5740
21.9750
2.52.3660
2.752.7670
33.1580
3.53.5490
approx std size, inchBall Dia, inchBall Dia.,mm
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Example of Polysius Ball Charge
100.00 100.009.5Total C2
0.0049990.0000.625
32.33495531.5830.75
0.0048860.0001
31.53483231.5831.25
15.62478815.791.51.5
20.52471821.0522
0.5Partition
100.00 100.004Total C1
25.00450025.0012.5
25.00450025.0012.75
25.00450025.0013
25.00450025.0013.5
% by wt.Bulk Density,
kg/m3% by VolMill Length,mBall Dia, in
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Slegten Ball Charge For Finish Mills
• Use 90 mm Balls for 20% (by wt.) of 1st Compartment Charge.
• Use Same number (“n”) of 80,70, and 60 mm Balls for Remainder of 1st Compartment Charge.
• Use “n” number of 50 and 40 mm Balls in 2nd Compartment. (Transition Zone)
• Fill Remainder of 2nd Compartment According to:
• D = Ball Dia., mm
• X = Distance from Transition Zone, m
xeD 1.33
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Slegten FM Ball Charge Design For Fine Grinding Zone
y = 33e-0.1x
0
5
10
15
20
25
30
35
0 1 2 3 4 5 6 7 8
Distance From End Of Transition Zone, m
Bal
l Dia
., m
m
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Compartment 1 - Polysius vs Slegten
Ball Charge Comparison,1st Compartment, 4m Dia by 4 m Length
0.0
10.0
20.0
30.0
40.0
3.5 3 2.75 2.5
Ball Sizes, inch
% o
f 1s
t C
om
par
tmen
t C
har
ge
Mas
s
Polysius
Slegten
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Compartment 2 - Polysius vs Slegten
Ball Charge Comparison, 2nd Compartment, 4m Dia. By 9.5 m Length
0.00
10.00
20.00
30.00
40.00
2 1.5 1.25 1 .75 .625
Ball Size, inch
% o
f 2nd
C
om
par
tmen
t C
har
ge
Mas
s
Polysius
Slegten
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Slegten vs Polysius
Comparison of Slegton and Polysius Ball Charges
00.5
11.5
22.5
33.5
4
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Distance From Mill Feed End, m
Bal
l d
iam
eter
, In
ch
Slegten
Polysius
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