About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Scandium Extraction and Use in Aluminum Alloys
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Presentation Title |
E-30: Scandium Extraction from TiO2 Pigment Production Residues by Ion Exchange: Evaluation of Two Commercial Ion Exchange Resins
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Author(s) |
Eleni Mikeli, Danai Marinos, Dimitrios Panias, Efthymios Balomenos, Carsten Dittrich, Robin Scharfenberg, Bengi Yagmurlu, Beate Orberger, Georges Croise |
On-Site Speaker (Planned) |
Eleni Mikeli |
Abstract Scope |
Scandium (Sc), is increasingly used in various applications such as solid oxide fuel cells, solid oxygen electrolyzers, 5G applications, thin film deposits, and aeronautics and space sectors. Scandium is present at significant concentrations (50-140 mg/L) in by-products from titanium oxide pigment production. In Europe, this presents about 0.7 million tons per year. In this study, the potential extraction of Sc by ion exchange (IX) of an acidic iron chloride solution, containing 130 mg/L of Sc was investigated. Two different ion-exchange resins were evaluated for their performance and their potential use in pilot-scale was evaluated through laboratory scale column experiments. Our results show that the impregnated resin containing bis (2-ethylhexyl)-phosphoric acid (D2EHPA) perform better for Sc extraction with a higher exhaustion point, towards the resin containing, aminomethyl-phosphonic acid (AMPA) functional group. In both resins, V, Zr and Ti are also co-extracted. Additionally, a full operation cycle was carried out, using oxalic acid as a scrubbing agent to remove impurities and ammonium fluoride to remove Sc from the loaded resin. |
Proceedings Inclusion? |
Planned: Light Metals |
Keywords |
Hydrometallurgy, Titanium, Extraction and Processing |