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Scandium Recovery from an Ammonium Fluoride Strip Liquor by Anti-Solvent Crystallization

1
Mining Engineering Department, Middle East Technical University, Ankara 06800, Turkey
2
KTH Royal Institute of Technology, Department of Chemical Engineering, Teknikringen 42, SE-100 44 Stockholm, Sweden
3
MEAB Chemie Technik GmbH, 52068 Aachen, Germany
4
IME Institute of Process Metallurgy and Metal Recycling, RWTH Aachen University, 52056 Aachen, Germany
*
Authors to whom correspondence should be addressed.
Metals 2018, 8(10), 767; https://doi.org/10.3390/met8100767
Received: 6 September 2018 / Revised: 21 September 2018 / Accepted: 22 September 2018 / Published: 26 September 2018
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Abstract

In this study, the crystallization of scandium from ammonium fluoride strip liquor, obtained by solvent extraction, was investigated using an anti-solvent crystallization technique. Acetone, ethanol, methanol and isopropanol were added individually to the strip liquor as the anti-solvent and scandium was precipitated and obtained in the form of (NH4)3ScF6 crystals. The results show that scandium can be effectively crystallized from the strip liquor to obtain an intermediate, marketable scandium product. Yields greater than 98% were obtained using an anti-solvent to strip liquor volumetric ratio of 0.8. Acetone had the least performance at lower anti-solvent to strip liquor volumetric ratios, possibly due to its limited H bonding capability with water molecules when compared to alcohols. View Full-Text
Keywords: scandium; anti-solvent crystallization; solvent extraction; precipitation; ammonium scandium hexafluoride; chemical equilibrium diagram scandium; anti-solvent crystallization; solvent extraction; precipitation; ammonium scandium hexafluoride; chemical equilibrium diagram
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Kaya, Ş.; Peters, E.M.; Forsberg, K.; Dittrich, C.; Stopic, S.; Friedrich, B. Scandium Recovery from an Ammonium Fluoride Strip Liquor by Anti-Solvent Crystallization. Metals 2018, 8, 767.

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