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Issue
Korean Journal of Chemical Engineering,
Vol.39, No.1, 134-145, 2022
Extraction of dysprosium from waste neodymium magnet solution with ionic liquids and ultrasound irradiation procedure
Asadollahzadeh M, Torkaman R
This study investigated imidazolium ionic liquids’ capability under ultrasonic irradiation conditions for dysprosium extraction from the aqueous nitrate solution. The main objective was to evaluate the feasibility of ultrasoundassisted extraction techniques compared to conventional solvent extraction. The extraction process was investigated as a function of the ionic liquids and organic extractant, organic/aqueous phase volume ratio, the acidity of the aqueous phase, contact time, ion concentration, temperature, and stripping condition. The outcomes demonstrated that the combination of C6MIM.PF6 and TOPO extractant is more extractable than the mixture of C6MIM.NTf2 and TOPO. The effects of ultrasonic irradiation on the Dy(III) ions show that ion transfer occurs with high extraction efficiency. The variation of logD versus temperature demonstrated that temperature had little impact on the extraction procedure. The recovery of dysprosium ions from the organic phase using 0.5M nitric acid is achieved in stripping studies. The results showed that the extraction and recovery under ultrasonic irradiation and with the presence of ionic liquids proposed a simple and environmentally friendly approach for the purification and separation of rare-earth ions from the permanent magnet wastewater.
Keywords: Imidazolium Ionic Liquid; Ultrasonic Irradiation; Rare Earth Ions; Permanent Magnet Wastewater
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