| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
2025 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-7: Study on the Kinetics of Magnetizing Roasting of Niobium Mineral Tailings Containing Rare Earth Elements |
| Author(s) |
Vitoria Garcia Alvarez, Flavio Beneduce |
| On-Site Speaker (Planned) |
Vitoria Garcia Alvarez |
| Abstract Scope |
A study was conducted on the kinetics of the carbothermic reduction from hematite to magnetite (magnetizing roasting) in Niobium mineral tailings containing rare earth elements. The objective was to investigate a possible processing route for this currently discarded material, from the largest Niobium producer worldwide (CBMM), as raw material for new products. Thermogravimetric tests done in triplicate were conducted for 3 different temperatures (700°C, 800°C and 900°C) for 1 hour and 200% stoichiometric amount of reductant (charcoal). Scanning electron microscopy (SEM) and X-ray diffraction (XRD) showed small amounts of magnetite in the samples reduced at 700°C and 800°C. At 900°C, in accordance to XRD analysis (Rietveld), almost all hematite was reduced to magnetite. The kinetic model that showed the best fitting for all experiments was the Ginstling-Brounstein (GB) model. Apparent activation energy (Ea) was evaluated to be 247,2 kJ/mol, similar to literature data. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Extraction and Processing, Pyrometallurgy, Recycling and Secondary Recovery |