Case | Fluidization water (l/min) | Weight recovery (%) | Final concentrate grade (% Fe) | Rougher spiral concentrate grade (% Fe) | Note |
No HC | 34.4 | 66.1 | 57.2 | Circuit with cleaner/recleaner spirals | |
A | 400 | 33.0 | 64.9 | 59.8 | Initial tuning of the rougher spirals |
B | 500 | 32.9 | 66.0 | 59.8 | Initial tuning of the rougher spirals |
C | 600 | 32.6 | 66.7 | 59.8 | Initial tuning of the rougher spirals |
D | 600 | 34.1 | 66.1 | 58.6 | Reduced wash water to the rougher spirals |