Effect of Particle Size and Grinding Time on Gold Dissolution in Cyanide Solution
Abstract
:1. Introduction
2. Objective and Experimental Procedure
2.1. Objective of the Test Work
2.2. Ore Characteristics
2.3. Experimental Procedure
3. Analysis of the Results
3.1. Measurements
3.2. Global Gold Dissolution
3.3. Gold Dissolution as a Function of Particle Size
4. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Elements | Minerals | ||
---|---|---|---|
Au | 10.4 g/t | Quartz, albite, phogopite | 58.5% |
Ag | 10.5 g/t | Calcite, chlinochlore | 31.1% |
Si | 26.0% | Pyrite | 3.2% |
Fe | 8.0% | Pyrrhotite | 0.8% |
Al | 6.0% | Chalcopyrite | 0.4% |
Ca | 4.4% | Sphalerite | 0.1% |
Grinding Time (min) | D80 (mm) | % <0.037 mm (−400 mesh) | % <0.106 mm (−150 mesh) | % <0.212 mm (−65 mesh) |
---|---|---|---|---|
15 | 0.850 | 21 | 26 | 40 |
35 | 0.318 | 25 | 33 | 51 |
65 | 0.106 | 35 | 49 | 76 |
Material | Note | Retained % | Non Leached Au(g/t) | 6 h Leach Au(g/t) | 12 h Leach Au(g/t) | 24 h Leach Au(g/t) | |||||
---|---|---|---|---|---|---|---|---|---|---|---|
Meas. | Std | Meas. | Std | Meas. | Std | Meas. | Std | Meas. | Std | ||
Calculated Feed | a | - | - | 12.38 | - | 12.05 | 1.60 | 12.64 | 1.70 | 11.43 | 1.60 |
Solution | - | - | - | 0.00 | - | 3.66 | 0.35 | 5.25 | 0.52 | 5.42 | 0.55 |
Measured Head (solids) | - | - | - | 12.38 | 1.65 | 8.23 | 0.85 | 7.16 | 0.81 | 5.77 | 0.65 |
Calculated Head (solids) | b | - | - | 13.26 | - | 8.67 | - | 5.99 | - | 6.25 | - |
+0.850 mm | - | 1.0 | 0.2 | 0.41 | 0.14 | 0.47 | 0.16 | 0.55 | 0.19 | 1.29 | 0.45 |
0.850/0.425 mm | - | 8.5 | 1.2 | 11.54 | 2.31 | 14.52 | 2.90 | 5.67 | 1.13 | 14.49 | 2.90 |
0.425/0.212 mm | - | 21.5 | 0.6 | 11.64 | 1.75 | 8.78 | 1.32 | 5.80 | 0.87 | 5.67 | 0.85 |
0.212/0.106 mm | - | 18.1 | 0.5 | 18.75 | 1.88 | 13.16 | 1.32 | 11.02 | 1.10 | 11.31 | 1.13 |
0.106/0.037 mm | - | 18.2 | 0.5 | 21.05 | 1.68 | 14.27 | 1.14 | 10.72 | 0.86 | 9.30 | 0.74 |
0.037/0.020 mm | - | 8.6 | 0.4 | 14.90 | 0.75 | 5.92 | 0.30 | 4.04 | 0.20 | 2.58 | 0.13 |
−0.020 mm | - | 24.1 | 1.2 | 4.10 | 0.16 | 0.58 | 0.02 | 0.32 | 0.01 | 0.22 | 0.01 |
Measured −0.037 mm | - | - | - | 6.65 | 0.33 | 2.00 | 0.10 | 1.10 | 0.06 | 0.71 | 0.04 |
Calculated −0.037 mm | c | - | - | 7.37 | - | 2.02 | - | 1.25 | - | 0.77 | - |
Material | Ore Retained | Gold Content (g/t) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
0 h | 6 h | 12 h | 24 h | |||||||
Obs. | Rec. | Obs. | Rec. | Obs. | Rec. | Obs. | Rec. | Obs. | Rec. | |
Feed Sample | - | - | - | 12.63 | - | 11.74 | - | 11.40 | - | 11.74 |
Solution | - | - | 0.00 | 0.00 | 3.66 | 3.64 | 5.25 | 5.21 | 5.42 | 5.37 |
Residues | - | - | 12.38 | 12.63 | 8.23 | 7.94 | 7.16 | 5.96 | 5.77 | 6.13 |
+0.850 mm | 1.0 | 0.9 | 0.41 | 0.41 | 0.47 | 0.47 | 0.55 | 0.55 | 1.29 | 1.29 |
0.850/0.425 mm | 8.5 | 7.6 | 11.54 | 11.36 | 14.52 | 14.29 | 5.67 | 5.66 | 14.49 | 14.13 |
0.425/0.212 mm | 21.5 | 21.3 | 11.64 | 11.31 | 8.78 | 6.39 | 5.80 | 5.77 | 5.67 | 5.52 |
0.212/0.106 mm | 18.1 | 17.9 | 18.75 | 18.49 | 13.16 | 12.91 | 11.02 | 10.97 | 11.31 | 10.92 |
0.106/0.037 mm | 18.2 | 17.9 | 21.05 | 20.95 | 14.27 | 14.15 | 10.72 | 10.71 | 9.30 | 9.22 |
0.037/0.020 mm | 8.6 | 8.2 | 14.90 | 14.89 | 5.92 | 5.94 | 4.04 | 4.01 | 2.58 | 2.50 |
−0.020 mm | 24.1 | 26.2 | 4.10 | 4.09 | 0.58 | 0.59 | 0.32 | 0.32 | 0.22 | 0.22 |
−0.037 mm | - | - | 6.65 | 6.66 | 2.00 | 1.86 | 1.10 | 1.19 | 0.71 | 0.76 |
Grinding Time (min) | Feed | 6 h Leaching | 12 h Leaching | 24 h Leaching | |||
---|---|---|---|---|---|---|---|
% Dissolved | Std | % Dissolved | Std | % Dissolved | Std | ||
15 | 0.0 | 26.3 | 2.7 | 47.5 | 5.3 | 50.8 | 5.5 |
35 | 0.0 | 32.4 | 3.4 | 47.7 | 5.1 | 47.8 | 4.8 |
65 | 0.0 | 45.8 | 5.1 | 46.8 | 5.2 | 64.5 | 5.1 |
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Egan, J.; Bazin, C.; Hodouin, D. Effect of Particle Size and Grinding Time on Gold Dissolution in Cyanide Solution. Minerals 2016, 6, 68. https://doi.org/10.3390/min6030068
Egan J, Bazin C, Hodouin D. Effect of Particle Size and Grinding Time on Gold Dissolution in Cyanide Solution. Minerals. 2016; 6(3):68. https://doi.org/10.3390/min6030068
Chicago/Turabian StyleEgan, Jessica, Claude Bazin, and Daniel Hodouin. 2016. "Effect of Particle Size and Grinding Time on Gold Dissolution in Cyanide Solution" Minerals 6, no. 3: 68. https://doi.org/10.3390/min6030068