Properties of stockpile fly ash fractions following pilot-scale processing
| Characteristic | SFA8 | Processed fly ash fraction | ||||
|---|---|---|---|---|---|---|
| PFA2 | PFA2 LC | PFA3 | PFA4 | PFA4 LC | ||
| Physical | ||||||
| Fineness: % retained on a 45 μm sieve | 62.3 | 30.6 | 30.8 | 1.5 | 0.6 | 1.8 |
| Median particle size, d50: μm | 33.0 | 33.2 | 24.9 | 13.8 | 7.1 | 8.1 |
| Particles < 10 μm: % by volume | 21.8 | 19.7 | 26.5 | 36.5 | 71.8 | 62.8 |
| Air entrainment-related properties | ||||||
| LOI: % | 6.3 | 6.1 | 3.1 | 6.3 | 6.6 | 3.3 |
| Carbon content: % | 4.8 | 5.0 | — | 4.9 | 4.6 | — |
| SSA (N2 adsorption): m2/g | 6.5 | 6.2 | 3.8 | 6.2 | 4.5 | 3.4 |
| Foam index: μl/g | 20 | 20 | 20 | 20 | 50 | 60 |
| AB80 adsorption: mg/g | 1.1 | 1.0 | 2.4 | 1.2 | 1.8 | 2.9 |
| PFA2 | PFA2 LC | PFA3 | PFA4 | PFA4 LC | ||
|---|---|---|---|---|---|---|
| Fineness: % retained on a 45 μm sieve | 62.3 | 30.6 | 30.8 | 1.5 | 0.6 | 1.8 |
| Median particle size, | 33.0 | 33.2 | 24.9 | 13.8 | 7.1 | 8.1 |
| Particles < 10 μm: % by volume | 21.8 | 19.7 | 26.5 | 36.5 | 71.8 | 62.8 |
| LOI: % | 6.3 | 6.1 | 3.1 | 6.3 | 6.6 | 3.3 |
| Carbon content: % | 4.8 | 5.0 | — | 4.9 | 4.6 | — |
| SSA (N2 adsorption): m2/g | 6.5 | 6.2 | 3.8 | 6.2 | 4.5 | 3.4 |
| Foam index: μl/g | 20 | 20 | 20 | 20 | 50 | 60 |
| AB80 adsorption: mg/g | 1.1 | 1.0 | 2.4 | 1.2 | 1.8 | 2.9 |
SFA8, feed material; PFA2, flash dried/de-agglomerated; PFA2 LC, flash dried/de-agglomerated/carbon removal; PFA3, flash dried/de-agglomerated/air classified; PFA4, flash dried/de-agglomerated/micronised; PFA4 LC, flash dried/de-agglomerated/micronised/carbon removal
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