Time, h | Leaching efficiency, % | ||||
Nb | Ta | REE | Ti | Zr | |
1 | 69 | 68 | 68 | 60.5 | 5 |
2 | 80 | 79 | 81 | 70.5 | 7 |
3 | 87.5 | 85 | 89 | 79 | 9 |
4 | 84 | 82 | 87 | 78 | 9 |