Alkali fusiontemp., ˚C | Leaching efficiency, % | ||||
Nb | Ta | REE | Ti | Zr | |
300 | 82 | 81 | 84 | 68 | 8 |
400 | 95 | 93.7 | 96 | 75 | 10 |
500 | 74.1 | 77 | 69 | 55 | 24.5 |
600 | 72 | 71 | 70 | 52 | 36 |