| Title | Sustainable Valorization of Bauxite Residue ("Red Mud"): Exploring the Potential of H2 Reduction for Multi-metal Recovery |
|---|---|
| ID_Doc | 25152 |
| Authors | Pilla, G; Hertel, T; Pontikes, Y |
| Title | Sustainable Valorization of Bauxite Residue ("Red Mud"): Exploring the Potential of H2 Reduction for Multi-metal Recovery |
| Year | 2024 |
| Published | |
| Abstract | This study presents a process for the simultaneous recovery of metals from bauxite residue (BR) at relatively lower temperatures using H-2 reduction to achieve zero-waste discharge (minimal waste generation) of BR. The proposed method involves blending BR with NaOH and subjecting it to H-2 reduction (using different process parameters), resulting in an intermediate material enriched in magnetite and water-soluble aluminate. Optimal process parameters were determined (temperature of 600 degrees C, a reduction time of 120 min, 20 wt.% NaOH addition, and a reduction atmosphere of 5 vol.% H-2 + 95 vol.% N-2 with a 20 L/h flowrate), resulting in satisfactory recoveries of Fe (74.7%, grade = 40%), Al (81.5%), and Na (91.4%). This approach represents a step towards the sustainable valorization of BR, i.e., the efficient recovery of metals (Fe, Al, and Na) along with a non-magnetic fraction (Ca, Si, Ti, Rare earth elements), a precursor for further Sc, Ti recovery, and an additive eventually for building materials. |
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