Research Article
Coal and Gangue Underground Pneumatic Separation Effect Evaluation Influenced by Different Airflow Directions
Table 2
Levels of factors.
| Level | Factor | gangue diameter (mm) | height difference (m) | conveyor belt velocity (m/s) |
| 1 | 50 | 0.40 | 0.50 | 2 | 80 | 0.80 | 1.00 | 3 | 100 | 1.10 | 2.00 |
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