Table 4.
Chemical Composition Analyzed by XRF, Loss on Ignition, and Total Carbon of Three RHA Types (Wt%)
| Composition | RHA FB | RHA MG | RHA S |
|---|---|---|---|
| SiO2 | 96.71 | 90.02 | 93.61 |
| Al2O3 | 0.09 | 0.08 | 0.06 |
| Fe2O3 | 0.01 | 0.01 | 0.03 |
| K2O | 0.69 | 0.81 | 0.66 |
| CaO | ND | 0.00 | ND |
| Cl | 0.02 | 0.03 | 0.08 |
| P2O5 | 0.23 | 0.34 | 0.30 |
| MgO | ND | ND | ND |
| SO3 | 0.06 | 0.07 | 0.11 |
| TiO2 | ND | ND | ND |
| ZnO | 0.01 | 0.01 | 0.01 |
| MnO | 0.01 | 0.00 | 0.01 |
| LOI | 2.96 | 9.88 | 6.73 |
| TC | 2.18 | 8.63 | 5.14 |
Note: Reprinted from Fuel, 165, Fernandes IJ, Calheiro D, Kieling AG, et al.Characterization of rice husk ash produced using different biomass combustion techniques for energy. 351–359, Copyright 2016, with permission from Elsevier.79
Abbreviations: LOI, loss on ignition; TC, total carbon; ND, not detected.