Permeability and de-aeration rate of common materials used in bulk solids handling
Including portland cement, coal, iron powder, PVC, wheat flour
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1. Data table
Note : orders of magnitude
only, of course variying depending on the actual specification of
materials
| Material | Compaction in % | Permeability in m3.s/kg*10-6 | Vibrated deaeration rate in m/s*10-3 |
| Alumina – sandy | 17 | 0.42 | 19 |
| Barytes | 43 | 0.48 | 3.9 |
| Cement – Ordinary Portland | 40 | 0.71 | 3 |
| Coal – granular | |||
| As supplied | 14 | 42 | 24 |
| Degraded | 36 | 1 | 2.9 |
| Pulverized | 31 | 0.53 | 4.3 |
| Copper concentrate | 30 | 0.33 | 9.8 |
| Fly ash – fine | 49 | 0.6 | 2 |
| Iron powder | 34 | 0.34 | 7 |
| Magnesium sulphate | 29 | 6.3 | 17 |
| Pearlite | 30 | 5.7 | 8.8 |
| Polyethylene – pellets | 5 | 420 | 60 |
| Potassium chloride | 16 | 11 | 26 |
| Potassium sulphate | 17 | 0.99 | 18 |
| PVC – powder | 22 | 1.2 | 8 |
| Silica sand | 12 | 3.9 | 34 |
| Sugar – granulated | |||
| Fresh | 10 | 20 | 13 |
| Degraded | 43 | 1.4 | 8.3 |
| Wheat flour | 37 | 1.3 | 6.2 |
| Zircon sand | 15 | 1.3 | 10 |
Source : Pneumatic conveying
design guide, Mills