About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Characterization of Minerals, Metals and Materials 2026 - In-Situ Characterization Techniques
|
| Presentation Title |
Unraveling the Synergistic Leaching of Low-Grade Scheelite in NaOH-Na₂CO₃: Insights from Advanced Material Characterization |
| Author(s) |
Xinran Li, Hao Jiang, zhiwei peng, Anan Duan, Tong Zhang, Zexi Gong |
| On-Site Speaker (Planned) |
Xinran Li |
| Abstract Scope |
Traditional acid leaching of low-grade scheelite (CaWO₄)faces challenges like high energy consumption and impurity dissolution. This study investigates the enhanced alkaline leaching of low-grade scheelite using NaOH-Na₂CO₃ synergy, and in-depth characterization of the changes in the material during the leaching process. Optimal conditions achieved an 88.84% tungsten extraction within 60 min at 200°C, a liquid-to-solid ratio of 5, an alkali concentration of 170 g/L, and a NaOH/Na₂CO₃ molar ratio of 12:1. X-ray diffraction (XRD) analysis revealed distinct phase transformations during leaching, while scanning electron microscopy and energy dispersive spectrometer (SEM-EDS) confirmed that Na₂CO₃ effectively inhibited the silica leaching. Residue characterization with X-ray photoelectron spectroscopy (XPS) and fourier transform infrared spectroscopy (FTIR) revealed the ionic competitive interaction between WO₄²⁻ and CO₃²⁻. This work establishes structure-activity relationships through multi-scale characterization, enabling efficient low-grade scheelite processing. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Extraction and Processing, Hydrometallurgy |