About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Rare Metal Extraction & Processing
|
| Presentation Title |
Influence of Roasting Temperature on Phosphorus Transformation and Leaching Behavior During Sulfuric Acid Roasting of Montebrasite Ore: A Thermodynamic and Experimental Insights |
| Author(s) |
Abdulmalik Hamza Bichi, Rongbo Zhu, Yuanjian Liu, Pengfei Zhao, Shenghai Yang, Yongming Chen |
| On-Site Speaker (Planned) |
Abdulmalik Hamza Bichi |
| Abstract Scope |
This study investigates the influence of roasting temperature on phosphorus transformation and leaching behavior during sulfuric acid roasting of Montebrasite ore with formula: LiAlPO4(OH)0.62F0.38. Montebrasite poses a persistent challenge due to the strong coupling between phosphorus (P) and aluminum (Al), which complicates selective recovery during conventional processing. Sulfuric acid (H2SO4) roasting experiments were performed across a temperature range of 140 to 900 °C with a fixed acid dosage of 50% ore mass, followed by water leaching at 80 °C. Thermodynamic modeling (100 to 1200 °C, 0.5 and 2.0 mol H₂SO₄ dosage) was employed to predict phase stability and transformation pathways, while experimental validation was carried out using ICP-OES, and XRD analyses. The results reveal a temperature-dependent shift in phosphorus speciation, at low roasting temperatures (<300 °C), P is predominantly released as soluble H3PO4, enhancing its leachability but accompanied by significant co-dissolution of Al. Above 600 °C, however, P reacts with Al-bearing species to form insoluble AlPO4, resulting in sharp suppression of P extraction (<0.5% at 800 °C). In contrast, lithium (Li) is stabilized as soluble Li2SO4 above 700 °C, maintaining high extraction efficiency (>93%). These findings highlight the dual role of roasting temperature: low temperatures favor P solubilization but reduce selectivity, while high temperatures suppress P extraction yet enable nearly selective lithium recovery. The study provides a mechanistic understanding of phosphorus-aluminum coupling during sulfuric acid roasting and offers critical insights for designing optimized processing strategies to balance selective Li recovery with efficient P separation in Montebrasite ore. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Recycling and Secondary Recovery, Hydrometallurgy, Extraction and Processing |