Research Article
Statistical Evaluation and Optimization of Factors Affecting the Leaching Performance of Copper Flotation Waste
Table 7
Design matrix of the Box-Behnken design.
| | Run no. | pH | Stirring time (min) | Temperature (°C) | Concentration of leached copper (mg/L) |
| | 1 | 3 (−1) | 5 (−1) | 40 (0) | 121.80 | | 2 | 9 (+1) | 5 (−1) | 40 (0) | 79.90 | | 3 | 3 (−1) | 150 (+1) | 40 (0) | 224.85 | | 4 | 9 (+1) | 150 (+1) | 40 (0) | 191.00 | | 5 | 3 (−1) | 77.5 (0) | 20 (−1) | 213.30 | | 6 | 9 (+1) | 77.5 (0) | 20 (−1) | 208.40 | | 7 | 3 (−1) | 77.5 (0) | 60 (+1) | 201.40 | | 8 | 9 (+1) | 77.5 (0) | 60 (+1) | 168.00 | | 9 | 6 (0) | 5 (−1) | 20 (−1) | 162.45 | | 10 | 6 (0) | 150 (+1) | 20 (−1) | 162.50 | | 11 | 6 (0) | 5 (−1) | 60 (+1) | 165.90 | | 12 | 6 (0) | 150 (+1) | 60 (+1) | 212.20 | | 13 | 6 (0) | 77.5 (0) | 40 (0) | 129.00 | | 14 | 6 (0) | 77.5 (0) | 40 (0) | 180.00 | | 15 | 6 (0) | 77.5 (0) | 40 (0) | 145.00 |
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