The ball loading ratio of different ball diameter and examples

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The ball loading ratio of  different ball diameter and examples
For the production of ore dressing plant grinding mill with ball approach can be summarized as follows:
 
(1) take the mill for ore (general respectively taking new feed and return sand, then proportionally sample sieve analysis), divided into several fractions, such as divided into 18 ~ 12, 12 ~ 10, 10 ~ 8, 8 ~ 6, weighing various grain, calculated the grain quality percentage (yield), such as,,......And so on;
   
(2) with the rank size limit (such as 18, 12, 10, 8......Etc) or upper, lower average (such as 15, 11, 9, 7......Refer to table 18), or using the formula to determine the particle size to the diameter of the ball, such as,......
   
(3) according to various sizes of ball grinding quality ratio and particle size composition to the principle, determine the various sizes of ball for ball total mass percentage, corresponding to ’D18= 1812、 ’D12= 1210、 ’D10= 10-8、  ’D8= 8-6……"
   
(4) the calculation results by proper adjustment.Due to the actual match ball, small ball not into, just select several balls, thus calculated from a small diameter ball, can be allocated in proportion to the larger ball, to determine the levels of ball quality percentage, D18D12D10……
   
(5) calculation of actual quality at all levels of the ball, as follows:
   
① according to the formula to calculate the total Weight of ball G:
      G——The weight of ball ,t;
      D——Cylinder diameter of ball mill ,m;
      L——The ball mill barrel effective length,m;
      ——Medium filling rate,%;
      ——The density of ball mill,t/m3
②According to the adjusted levels of ball ratio is calculated from the various ball quality respectivelyGD18=G· D18,GD12=G· D12, GD10=G· D10GD8=G· D8……
 [Eg.]A dressing plant of 1500mm×3000mm put the ball of wet grate ball mill ,
Filling rate =50%,Cast steel ball =4.5t/m3,Mill for medium hard ore processing.
1) full screen mill to analysis the results in table 19.
Table 19 
The analysis result to the screen
Feed size(mm)
Yiled(%)
Feed size(mm)
Yiled(%)
18~12
18-12=20
6~4
6-4=5
12~10
12-10=40
4~2
4-2=4
10~8
10-8=15
2~1
2-1=4
8~6
8-6=8
1~0
1-0=4
 
2) according to the levels of limit calculation should match the ball diameter and rounded, see table 20.
 
Table 20  Should match the ball size
Feed size(mm)
Ball dia(mm)
Feed size(mm)
Ball dia(mm)
18~12
D18=120
6~4
D6=70
12~10
D12=100
4~2
D4=60
10~8
D10=90
2~1
D2=50
8~6
D8=80
1~0
D1=40
 
3) various ball quality percentage is shown in table 21
 
Table 21 Various ball quality percentage
Ball dia(mm)
Mass ratio(%)
Ball dia(mm)
Mass ratio(%)
120
20
70
5
100
40
60
4
90
15
50
4
80
8
40
4
 
When identified as 120、100、80、60 four ball ,it may let 90、70、50、40Proportion of the ball properly adjusted to the other ball, in this case after adjusting the results i
Table 22  After adjusting for various ball quality percentage
Ball dia(mm)
Mass ratio(%)
Ball dia(mm)
Mass ratio(%)
120
30
80
13
100
45
60
12
 
4) Calculation of the total mass added to the ballG:
5)Calculation of ball should join the quality    G120=G· 120=11.928×0.3=3.58 (t)
    G100=G· 100=11.928×0.45=5.37 (t)
    G80=G· 80=11.928×0.13=1.55 (t)
    G60=G· 60=11.928×0.12=1.43 (t)
6)According to the calculation results, the weighing charging ball.

*This article is from the Hengchang mining machinery Company Shaking table 

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