Institut za rudarstvo i metalurgiju Bor

the effect of grinding fineness on copper
recovery in basic concentrate.
EXPERIMENTAL PART
Milling experiments were carried out
in the elliptical ball mill, volume 15.2 dm 3 .
Mass of ball charge at the beginning of
testing was 12 kg. For one experiment,
870 g of slag was ground with solid
content of 75%. For determination the
dependence of class content - 75μm on
grinding time, four samples were ground.
Table 4 presents the grain-size distribution
of ground samples.
Table 4. Grain-size distribution of grinding products for various grinding times.
Grinding time, min
Size class, μm 10 15 20 30
m% D% m% D% m% D% m% D%
-425+300 0,4 100,0
-300+212 2,6 99,6 0,4 100,0 0,8 100,0 0,4 100,0
-212+106 23,0 97,0 14,8 99,6 4,4 99,2 1,6 99,6
-106+75 15,6 74,0 15,2 84,8 12,0 94,8 5,2 98,0
-75+53 11,4 58,4 12,4 69,6 12,0 82,8 9,6 92,8
-53+38 8,8 47,0 10,4 57,20 13,2 70,8 12,0 83,2
-38+0 38,2 38,2 46,8 46,8 57,6 57,6 71,2 71,2
Figure 1 presents the grain-size
distribution of grinding products in various
grinding times, and Figure 2 presents the
Prosev sita , %
100
80
60
40
20
dependence of size-class content -75μm on
grinding time.
Vreme mlevenja
0
0 100 200 300 400
Otvor sita , μm
10 min
15 min
20 min
30 min
Figure 1. Grain-size distribution of grinding products in various grinding times
No 1,2010. 112
MINING ENGINEERING