Table 3. Leaching of saprolite laterite ore using the atmospheric acid leaching liquor (No. V listed in Table 2) of limonite laterite ore at various leaching temperatures.
| I | II | III | ||
|---|---|---|---|---|
| Leaching conditions | Iron concentration (g L−1) | 157.0 | 157.0 | 157.0 |
| Residual acid concentration (mol L−1) | 1.02 | 1.02 | 1.02 | |
| Liquid to solid ratio (mL g−1) | 1.0 | 1.0 | 1.0 | |
| Leaching time (min) | 180 | 180 | 180 | |
| Leaching temperature (°C) | 160 | 180 | 200 | |
| Leaching efficiency (%) | Ni | 89.3 | 93.2 | 94.5 |
| Co | 90.2 | 93.8 | 94.8 | |
| Mn | 91.2 | 95.6 | 96.2 | |
| Mg | 80.1 | 89.2 | 90.8 | |
| Precipitation efficiency (%) | Fe | 60.5 | 74.6 | 82.3 |