Extraction Of Silica From Rice Husk Via Acid Leaching Treatment
Table 2:
| Citric acid content | Stirring time(min) | SiO2 (wt %) | Fe2O3 (wt %) |
| Rice husk (untreated) | - | 82.8 | 0.510 |
| 0.1M | 30 | 96.7 | 0.190 |
| 0.1M | 60 | 98.3 | 0.200 |
| 0.1M | 90 | 98.4 | 0.061 |
| 0.5M | 30 | 94.4 | 0.410 |
| 0.5M | 60 | 94.4 | 0.400 |
| 0.5M | 90 | 94.9 | 0.370 |
| 1.0 M | 30 | 91.8 | 0.200 |
| 1.0 M | 60 | 98.6 | 0.368 |
| 1.0 M | 90 | 96.7 | 0.040 |