Table 4.
The chemical composition of waste foundry sand (WFS), fly ash (FA), and electric arc furnace slag (EAF slag).
| Oxides | Content (wt. %) |
||
|---|---|---|---|
| WFS | FA | EAF | |
| SiO2 | 83.6 | 32.9 | 11.8 |
| Al2O3 | 2.91 | 17.8 | 5.83 |
| CaO | 0.417 | 18.8 | 19.4 |
| Fe2O3 | 1.71 | 12.4 | 32.7 |
| SO3 | 628 (ppm) | 4.53 | 0.205 |
| MgO | 0.994 | 2.33 | 3.63 |
| K2O | 0.526 | 2.18 | 291 (ppm) |
| Na2O | 0.368 | 1.95 | 519 (ppm) |
| TiO2 | 727 (ppm) | 0.418 | 0.528 |
| P2O5 | 231 (ppm) | 0.232 | 0.311 |
| Cl | 156 (ppm) | - | 244 (ppm) |
| BaO | 0.0 (ppm) | 0.118 | 0.191 |
| SrO | 25.2 (ppm) | 0.109 | 531 (ppm) |
| MnO | 250 (ppm) | 922 (ppm) | 5.33 |
| As2O3 | - | 285 (ppm) | - |
| V2O5 | 0.0 (ppm) | 268 (ppm) | 0.121 |
| Cr2O3 | 0.124 | 172 (ppm) | 2.28 |
| ZnO | 443 (ppm) | 163 (ppm) | 70.6 (ppm) |
| Nb2O5 | - | - | 225 (ppm) |
| ZrO2 | 106 (ppm) | 138 (ppm) | 198 (ppm) |
| Rb2O | 22.6 (ppm) | 121 (ppm) | - |
| NiO | 152 (ppm) | 90.4 (ppm) | 0.0 (ppm) |
| CuO | 52.0 (ppm) | 82.4 (ppm) | 113 (ppm) |
| CoO | 0.0 (ppm) | 0.0 (ppm) | 0.0 (ppm) |
| Ag | - | 0.0 (ppm) | - |
| Au | 0.0 (ppm) | 0.0 (ppm) | 0.0 (ppm) |
| Hg | 0.0 (ppm) | 0.0 (ppm) | 0.0 (ppm) |