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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Scandium Extraction and Use in Aluminum Alloys
Presentation Title Solvent Extraction of Scandium from Titanium Process Solutions
Author(s) Dimitrios Filippou, Michel Paquin, Yves Pépin, Mike Johnson, Niels Verbaan
On-Site Speaker (Planned) Mike Johnson
Abstract Scope Scandium is present in titanium dioxide feedstock (ilmenite, titania slags, etc.) and usually reports to process solutions and effluents either at the feedstock producer site or at the end user site (TiO2 pigment or Ti metal plant). In this paper, we report on the refining of scandium from such solutions by solvent extraction. A mixture of D2EHPA and TBP was used to extract scandium from a scandium-rich intermediate aqueous solution, which had been previously recovered from a titania slag upgrading process. Scandium loaded organic was scrubbed with H2SO4 to remove titanium and thorium, and the scrubbed organic was stripped with NaOH to produce an impure scandium hydroxide precipitate. The precipitate was dissolved in H2SO4, and the resulting solution was treated further with Alamine® 336 and Aliquat® 336 to remove persistent impurities. The formation of solids in the D2EHPA stripping step was a significant process issue, but ultimately high purity scandium oxide was produced. For reasons not related to the work reported here, Rio Tinto eventually selected other processing methods for its scandium extraction plant in Sorel-Tracy, QC, Canada.
Proceedings Inclusion? Planned: Light Metals
Keywords Other, Hydrometallurgy, Recycling and Secondary Recovery

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Comparative Study of Al-Mg-Ti(-Sc-Zr) Alloys Fabricated by Cold Metal Transfer and Electron Beam Additive Manufacturing
Developing Al-Zr-Sc Alloys as High-temperature-resistant Conductors for Electric Overhead Powerline Applications
Dissolution and Development of Al3(Sc,Zr) Dispersoids in 5025 Structures Produced via Wire Arc Additive Manufacturing
E-30: Scandium Extraction from TiO2 Pigment Production Residues by Ion Exchange: Evaluation of Two Commercial Ion Exchange Resins
E-31: Effect of Sc on Surface Recrystallization of AA7050 Extrusions
Effect of Cooling Rate on W-phase Formation in Al-Cu-Sc Alloys
Effect of Sc and Zr Additions on Dispersoid Microstructure and Mechanical Properties of Hot-rolled AA5083 Alloys
Effect of Sc, Zr and Other REE on the 1XXX Conductive Aluminium Alloys Properties
Effect of Zr and Sc on Intermetallic Morphology and Hardening of an Al-Fe Alloy
Efficiency of Sc for Strengthening and Formability Improvement of 5XXX BiW Sheets
European Scandium for a Lighter and Greener Future
FEA Materials - AlSc Master Alloy Production Technology
Formation of Al3Sc Dispersoids and Associated Strengthening Mechanisms
Investigations into Optimized Industrial Pilot Scale BR Leaching for Sc Extraction
New Scandium Containing Aluminium Welding Wires for Wire + Arc Additive Manufacturing
Scandium Master Alloy Production via Sulfidation and Vacuum Aluminothermic Reduction
Solute Clustering during Natural Ageing in Al-Cu-(Sc)-(Zr) Alloys
Solvent Extraction of Scandium from Titanium Process Solutions
State of the Art Technologies for Scandium Recovery, Purification, and Aluminum-Scandium Alloy Production
Sustainable Scandium Recovery Method from Metallic 3D Printing Powders
Sustainable Selective Separation of Scandium from Acidic Industrial Wastes
The Development of New Aluminum Alloys for the Laser Powder-bed Fusion Process
Use of Sc to Improve the Properties of AA5083 Cast and Rolled Products

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