About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Thermodynamics for Sustainability: An EPD Symposium in Honor of Kazuki Morita
|
| Presentation Title |
Leaching mechanism and kinetics of Laterite Ore by Phosphoric Acid for extraction of Ni and Co |
| Author(s) |
Muhamad Nawawi Alif, Seongjin Kim, Leonardo Tomas Da Rocha, Sung-Mo Jung |
| On-Site Speaker (Planned) |
Sung-Mo Jung |
| Abstract Scope |
The phosphoric acid was used to extract nickel and cobalt from laterite ore along with the recovery of iron in the residue in an atmospheric pressure. The current study aimed to identify the leaching mechanism and kinetics. Thermodynamic analyses indicated that selective leaching of nickel and cobalt over iron occurs at a pH below 4.7, where iron remains solid precipitates in the form of iron phosphate dihydrate. The phase and compositional analyses of the residue obtained during leaching, iron and phosphorus were analyzed to be 24.8 and 13.7%, respectively, as the primary elements. The minor elements amount to 4.8% with silica being the major component. The leaching process was identified to follow the product layer diffusion control of the shrinking core model where the activation energies were evaluated to be 31.9 kJ/mol for nickel and 8.5 kJ/mol for cobalt in the temperature range of 50 to 100 °C. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Extraction and Processing, Hydrometallurgy, Process Technology |