Research Article
Statistical Evaluation and Optimization of Factors Affecting the Leaching Performance of Copper Flotation Waste
Table 3
Design matrix of the 23 full factorial design.
| | Run no. | pH | Stirring time (min) | Temperature (°C) | Average concentration of leached copper (mg/L) |
| | 1 | 3 (−1) | 5 (−1) | 20 (−1) | 221.00 | | 2 | 9 (+1) | 5 (−1) | 20 (−1) | 146.95 | | 3 | 3 (−1) | 150 (+1) | 20 (−1) | 209.90 | | 4 | 9 (+1) | 150 (+1) | 20 (−1) | 132.20 | | 5 | 3 (−1) | 5 (−1) | 60 (+1) | 191.00 | | 6 | 9 (+1) | 5 (−1) | 60 (+1) | 133.70 | | 7 | 3 (−1) | 150 (+1) | 60 (+1) | 228.75 | | 8 | 9 (+1) | 150 (+1) | 60 (+1) | 216.4 | | 9 | 6 (0) | 77.5 (0) | 40 (0) | 129.00 | | 10 | 6 (0) | 77.5 (0) | 40 (0) | 180.00 | | 11 | 6 (0) | 77.5 (0) | 40 (0) | 145.00 |
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