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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Rare Metal Extraction and Processing
Presentation Title Extraction for Neodymium from NdFeB Magnet Using Supercritical Carbon Dioxide and Organophosphorus Ligands
Author(s) Nattanai Kunanusont, Jiakai Zhang, Yusuke Shimoyama, Gisele Azimi
On-Site Speaker (Planned) Jiakai Zhang
Abstract Scope Supercritical carbon dioxide (sc-CO2) is an emerging green solvent for recovery of metals from secondary sources. The sc-CO2 ­is a non-polar solvent; thus, a suitable chelating agent is required to accommodate a polarity difference between the solute and solvent during the extraction of metal ions and organometallic compounds. This study investigates four different organophosphorus ligands including triethyl phosphate (TEP), tri-n-butyl phosphate (TBP), tributyl phosphine oxide (TBPO), and trioctyl phosphine oxide (TOPO), on the solubility and effect on extraction for neodymium from NdFeB magnet in sc-CO2. A COSMO-vac model was developed to estimate solubility of the four agents in sc-CO2, and it shows that the order of solubility is following: TEP > TBPO ~ TBP > TOPO. The coordination environment of neodymium was determined by UV-Vis measurement, resulting a TEP:Nd = 1, TBP:Nd = 3, TBPO:Nd = 3, and TOPO:Nd = 4. The highest extraction for neodymium is achieved with TEP, which is due to low coordination number resulting less hydrophobic interactions between aliphatic functionalities, and the smaller micellar assemblies has a higher solubility in sc-CO2; thus, a higher extraction efficiency is achieved.
Proceedings Inclusion? Planned:

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