Table 4. Leaching results of limonite laterite ore using atmospheric acid leaching liquors (No. II and III listed in Table 2) of limonite laterite ore under various leaching conditions.
| I | II | III | ||
|---|---|---|---|---|
| Leaching conditions | Iron concentration (g L−1) | 80.2 | 94.3 | 94.3 |
| Residual acid concentration (mol L−1) | 0.65 | 0.78 | 0.78 | |
| Leaching temperature (°C) | 180 | 180 | 200 | |
| Liquid to solid ratio (mL g−1) | 1.0 | 1.0 | 1.0 | |
| Leaching time (min) | 180 | 180 | 180 | |
| Leaching efficiency (%) | Ni | 89.8 | 93.2 | 94.8 |
| Co | 90.3 | 93.6 | 95.2 | |
| Mn | 91.5 | 95.4 | 96.6 | |
| Mg | 86.5 | 90.3 | 92.3 | |
| Precipitation efficiency (%) | Fe | 85.4 | 82.3 | 88.9 |