Scandium and Titanium Recovery from Bauxite Residue by Direct Leaching with a Brønsted Acidic Ionic Liquid
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Bauxite Residue Characterization
3.2. Ionic Liquid Characterization
Reaction Mechanism
3.3. Leaching Process Optimization: Parameters Affecting the System
3.3.1. Stirring Rate
3.3.2. Kinetic Studies
3.3.3. Pulp Density
3.4. Characterization of the Solid Residue after Leaching
3.5. REEs in the Solid Residue
4. Conclusions
Author Contributions
Acknowledgments
Conflicts of Interest
Appendix A
References
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Unit | Fe2O3 | Al2O3 | SiO2 | TiO2 | CaO | Na2O | REO | LOI | Others | Sum |
---|---|---|---|---|---|---|---|---|---|---|
wt.% | 42.34 | 16.25 | 6.97 | 4.27 | 11.64 | 3.83 | 0.19 | 12.66 | 1.85 | 100.00 |
Mineralogical Phase | Formula | wt.% |
---|---|---|
Hematite | Fe2O3 | 30 |
Calcium aluminum iron silicate hydroxide | Ca3AlFe(SiO4)(OH)8 | 17 |
Cancrinite | Na6Ca2(AlSiO4)6(CO3)2 | 15 |
Diaspore | α-AlOOH | 9 |
Goethite | Fe2O3·H2O | 9 |
Perovskite | CaTiO3 | 4.5 |
Chamosite | (Fe2+,Mg)5Al(AlSi3O10)(OH)8 | 4 |
Calcite | CaCO3 | 4 |
Boehmite | γ-AlOOH | 3 |
Gibbsite | Al(OH)3 | 2 |
Rutile | TiO2 | 0.5 |
Anatase | TiO2 | 0.5 |
Sum | 98.5 |
Metal Oxide | Fe2O3 | Al2O3 | SiO2 | TiO2 | CaO | Na2O | REO | SO3 | LOI | Others |
---|---|---|---|---|---|---|---|---|---|---|
wt.% | 3.71 | 27.44 | 14.51 | 1.46 | 24.73 | 2.75 | 0.19 | 18.69 | 6.00 | 0.52 |
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Bonomi, C.; Alexandri, A.; Vind, J.; Panagiotopoulou, A.; Tsakiridis, P.; Panias, D. Scandium and Titanium Recovery from Bauxite Residue by Direct Leaching with a Brønsted Acidic Ionic Liquid. Metals 2018, 8, 834. https://doi.org/10.3390/met8100834
Bonomi C, Alexandri A, Vind J, Panagiotopoulou A, Tsakiridis P, Panias D. Scandium and Titanium Recovery from Bauxite Residue by Direct Leaching with a Brønsted Acidic Ionic Liquid. Metals. 2018; 8(10):834. https://doi.org/10.3390/met8100834
Chicago/Turabian StyleBonomi, Chiara, Alexandra Alexandri, Johannes Vind, Angeliki Panagiotopoulou, Petros Tsakiridis, and Dimitrios Panias. 2018. "Scandium and Titanium Recovery from Bauxite Residue by Direct Leaching with a Brønsted Acidic Ionic Liquid" Metals 8, no. 10: 834. https://doi.org/10.3390/met8100834