2336 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
RESULTS AND DISCUSSION
Pulp Chemistry Properties for Different
Milling Products
The pH, Eh, and DO of the slurry after milled two types
of ores with different milled media were measured, and the
results are shown in Table 3.
The pH of NK ore after milled with two different
media is almost the same, while JC ore has a higher pH
after milled with stainless steel balls. The changes in Eh and
DO of the two ores after milled with different media are
consistent. Compared with cast iron medium, stainless steel
medium results in a higher Eh value of slurry after milled,
indicating that the reducing atmosphere under stainless
steel medium milled conditions is weaker than that under
cast iron medium ones. This is consistent with the higher
DO value under the milled conditions, as less oxygen is
consumed under a weaker reducing atmosphere.
Solids and Water Recovery for Different
Milling Products
The curves of Solids vs. water recovery of different milled
products are shown in Figure 1.
The water in concentrate (392 g) and the solid mass
of rougher concentrate (101 g) for JC ore after milled with
cast iron balls are significantly higher than those (222 g and
83 g) with stainless steel balls. And the slope(0.18) of the
water recovery vs. solids mass curve after milled with cast
iron balls is smaller than that (0.30) of the stainless steel
balls, and the water content (3.9 g) per unit of rougher con-
centrate is significantly higher than that (2.7g) of the stain-
less steel balls milled product.
The water in concentrate (70 g) and the solid mass of
rougher concentrate (35 g) of NK ore after milled with cast
iron balls are also higher than those (67 g and 29 g) with
stainless steel balls, and the slope(0.46) of the water recov-
ery vs. solids mass curve after milled with cast iron balls is
slightly larger than that (0.38) of the stainless steel balls,
and the water content (2.0 g) per unit of rougher concen-
trate is slightly lower than that (2.3 g) of the stainless steel
balls milled product.
After milled the two ores with cast iron balls, the
total water content in the concentrate froth is higher than
that with the stainless steel balls. The water content of the
concentrate froth is related to the properties of the froth.
After milled with cast iron balls, the flotation froth vol-
ume is larger in the flotation process, which to some extent
increases the entrainment effect on gangue, which is con-
sistent with the test results of higher concentrate mass.
However, there is a significant difference in the composi-
tion of the rougher concentrates of the two ores after milled
with cast iron balls. In order to deeply understand the influ-
ence discrepancy of milling media between the two ore, the
Table 3. Eh, pH and DO of different milling products
Ore Media pH Value Eh (vs SHE)/mV DO/(mg·L–1)
NK Ore Cast Iron 9.80 35.60 1.72
Stainless Steel 9.70 90.00 6.40
JC Ore Cast Iron 8.50 22.50 1.94
Stainless Steel 9.10 76.20 7.55
0 100 200 300 400
20
40
60
80
100
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Equation y =a +b*x
Value Standard Error
?$OP:A=
1
Intercept 19.47791 3.207
Slope 0.30123 0.02159
Equation y =a +b*x
Value Standard Error
?$OP:A=
1
Intercept 31.17209 4.62532
Slope 0.18435 0.01671
0 10 20 30 40 50 60 70 80
0
10
20
30
"Ecuv"Ktqp
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Equation y =a +b*x
Value Standard Error
?$OP:A=
1
Intercept 2.25748 1.97793
Slope 0.45624 0.03514
Equation y =a +b*x
Value Standard Error
?$OP:A=1
Intercept 3.21948 0.12395
Slope 0.38125 0.00264
Figure 1. Solids vs water recovery of differneet milled products for A-JC ore and B-NK ore
RESULTS AND DISCUSSION
Pulp Chemistry Properties for Different
Milling Products
The pH, Eh, and DO of the slurry after milled two types
of ores with different milled media were measured, and the
results are shown in Table 3.
The pH of NK ore after milled with two different
media is almost the same, while JC ore has a higher pH
after milled with stainless steel balls. The changes in Eh and
DO of the two ores after milled with different media are
consistent. Compared with cast iron medium, stainless steel
medium results in a higher Eh value of slurry after milled,
indicating that the reducing atmosphere under stainless
steel medium milled conditions is weaker than that under
cast iron medium ones. This is consistent with the higher
DO value under the milled conditions, as less oxygen is
consumed under a weaker reducing atmosphere.
Solids and Water Recovery for Different
Milling Products
The curves of Solids vs. water recovery of different milled
products are shown in Figure 1.
The water in concentrate (392 g) and the solid mass
of rougher concentrate (101 g) for JC ore after milled with
cast iron balls are significantly higher than those (222 g and
83 g) with stainless steel balls. And the slope(0.18) of the
water recovery vs. solids mass curve after milled with cast
iron balls is smaller than that (0.30) of the stainless steel
balls, and the water content (3.9 g) per unit of rougher con-
centrate is significantly higher than that (2.7g) of the stain-
less steel balls milled product.
The water in concentrate (70 g) and the solid mass of
rougher concentrate (35 g) of NK ore after milled with cast
iron balls are also higher than those (67 g and 29 g) with
stainless steel balls, and the slope(0.46) of the water recov-
ery vs. solids mass curve after milled with cast iron balls is
slightly larger than that (0.38) of the stainless steel balls,
and the water content (2.0 g) per unit of rougher concen-
trate is slightly lower than that (2.3 g) of the stainless steel
balls milled product.
After milled the two ores with cast iron balls, the
total water content in the concentrate froth is higher than
that with the stainless steel balls. The water content of the
concentrate froth is related to the properties of the froth.
After milled with cast iron balls, the flotation froth vol-
ume is larger in the flotation process, which to some extent
increases the entrainment effect on gangue, which is con-
sistent with the test results of higher concentrate mass.
However, there is a significant difference in the composi-
tion of the rougher concentrates of the two ores after milled
with cast iron balls. In order to deeply understand the influ-
ence discrepancy of milling media between the two ore, the
Table 3. Eh, pH and DO of different milling products
Ore Media pH Value Eh (vs SHE)/mV DO/(mg·L–1)
NK Ore Cast Iron 9.80 35.60 1.72
Stainless Steel 9.70 90.00 6.40
JC Ore Cast Iron 8.50 22.50 1.94
Stainless Steel 9.10 76.20 7.55
0 100 200 300 400
20
40
60
80
100
"Ecuv"Ktqp
"Uvckpnguu"Uvggn
Equation y =a +b*x
Value Standard Error
?$OP:A=
1
Intercept 19.47791 3.207
Slope 0.30123 0.02159
Equation y =a +b*x
Value Standard Error
?$OP:A=
1
Intercept 31.17209 4.62532
Slope 0.18435 0.01671
0 10 20 30 40 50 60 70 80
0
10
20
30
"Ecuv"Ktqp
"Uvckpnguu"Uvggn
Equation y =a +b*x
Value Standard Error
?$OP:A=
1
Intercept 2.25748 1.97793
Slope 0.45624 0.03514
Equation y =a +b*x
Value Standard Error
?$OP:A=1
Intercept 3.21948 0.12395
Slope 0.38125 0.00264
Figure 1. Solids vs water recovery of differneet milled products for A-JC ore and B-NK ore