XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 1463
Potential Sulphidization (CPS). When CPS was employed
grinding finer than 150 µm and increasing the collector
dosage above 10 g/t did not significantly alter the rougher
performance. The addition of NaHS to a SIE potential
between –300 mV to –400 mV significantly improved both
the copper oxide and sulfide recovery. Further increases in
NaHS/SIE potential resulted in depression of copper sul-
fide minerals. The rougher flotation protocol is as follows:
• SIBX 10 g/t
• Fuel Oil 20 g/t
• Natural pH
• Primary grind P80 150 mm
• SIE potential –300 mV to –400 mV
• 30–35% solids
This protocol was tested on various variability samples and
compared to the previous test work without CPS. Flotation
recovery remained highly correlated with the oxide (acid
soluble) copper content, but an increase in Cu recovery was
Figure 7. Discrimination function biplot for the copper world sulfide associations based on the
sub-composition Fe, S, Cu, Ca, Mg, Na, Al, K (n=265)
Table 6. Comminution results
Statistic
SGI/SPI CWi RWi BWi Ai Relative
Density A x b ta
Relative
Density Mia Mih Mic (min) (kWh/ton) (kWh/ton) (kWh/ton) (g)
Samples Tested 55 55 55 22 22 22 22 97 559 12 11 570 177
Average 2.84 50.50 0.53 2.84 16.5 12.0 6.2 17.7 99.0 4.9 10.9 11.6 0.2820
Standard Deviation 0.19 21.10 0.28 0.21 4.7 4.2 2.2 10.1 57.0 1.0 2.8 2.4 0.1660
Minimum 2.52 18.70 0.14 2.52 7.4 4.4 2.3 1.0 14.0 3.7 6.5 5.6 0.0020
Median 2.85 46.70 0.47 2.85 16.8 12.1 6.3 16.0 91.0 4.7 10.7 11.8 0.2850
75th Percentile 2.94 56.30 0.62 2.93 19.4 14.4 7.5 21.4 121.0 5.8 12.9 13.0 0.4150
90th Percentile 3.08 75.60 0.83 3.09 21.7 16.7 8.6 32.9 173.0 5.9 14.5 14.8 0.5140
Maximum 3.42 133.10 1.49 3.42 26.5 21.3 11.0 48.5 401.0 6.7 15.0 19.7 0.6310
DWT /SMC Test® SMC Test®
Ci
Potential Sulphidization (CPS). When CPS was employed
grinding finer than 150 µm and increasing the collector
dosage above 10 g/t did not significantly alter the rougher
performance. The addition of NaHS to a SIE potential
between –300 mV to –400 mV significantly improved both
the copper oxide and sulfide recovery. Further increases in
NaHS/SIE potential resulted in depression of copper sul-
fide minerals. The rougher flotation protocol is as follows:
• SIBX 10 g/t
• Fuel Oil 20 g/t
• Natural pH
• Primary grind P80 150 mm
• SIE potential –300 mV to –400 mV
• 30–35% solids
This protocol was tested on various variability samples and
compared to the previous test work without CPS. Flotation
recovery remained highly correlated with the oxide (acid
soluble) copper content, but an increase in Cu recovery was
Figure 7. Discrimination function biplot for the copper world sulfide associations based on the
sub-composition Fe, S, Cu, Ca, Mg, Na, Al, K (n=265)
Table 6. Comminution results
Statistic
SGI/SPI CWi RWi BWi Ai Relative
Density A x b ta
Relative
Density Mia Mih Mic (min) (kWh/ton) (kWh/ton) (kWh/ton) (g)
Samples Tested 55 55 55 22 22 22 22 97 559 12 11 570 177
Average 2.84 50.50 0.53 2.84 16.5 12.0 6.2 17.7 99.0 4.9 10.9 11.6 0.2820
Standard Deviation 0.19 21.10 0.28 0.21 4.7 4.2 2.2 10.1 57.0 1.0 2.8 2.4 0.1660
Minimum 2.52 18.70 0.14 2.52 7.4 4.4 2.3 1.0 14.0 3.7 6.5 5.6 0.0020
Median 2.85 46.70 0.47 2.85 16.8 12.1 6.3 16.0 91.0 4.7 10.7 11.8 0.2850
75th Percentile 2.94 56.30 0.62 2.93 19.4 14.4 7.5 21.4 121.0 5.8 12.9 13.0 0.4150
90th Percentile 3.08 75.60 0.83 3.09 21.7 16.7 8.6 32.9 173.0 5.9 14.5 14.8 0.5140
Maximum 3.42 133.10 1.49 3.42 26.5 21.3 11.0 48.5 401.0 6.7 15.0 19.7 0.6310
DWT /SMC Test® SMC Test®
Ci