| Time, min | Leaching efficiency, % | ||||
| Nb | Ta | REE | Ti | Zr | |
| 30 | 77 | 73 | 80 | 66 | 6 |
| 60 | 95 | 93.7 | 96 | 75 | 10 |
| 90 | 94 | 93.5 | 96 | 74.7 | 10 |
| 120 | 95 | 93.5 | 95 | 74 | 10 |