钕磁铁
共晶体系
磁铁
萃取(化学)
材料科学
化学工程
化学
色谱法
冶金
合金
机械工程
工程类
作者
Sajith Babu M K,Katchala Nanaji,Thillai Sivakumar Natarajan,S. Suresh,K. Srinivasa Rao
标识
DOI:10.1016/j.molliq.2024.124697
摘要
Integral to emerging technologies, the escalating demand for NdFeB magnets has emphasized their pivotal role. Yet, natural resource depletion intensifies the supply challenge. Nd (III) and Dy (III), classified as critical metals, compound this concern. Recycling these metals from secondary sources, particularly discarded NdFeB magnets, presents a compelling and sustainable strategy. Here, we employ hydrophobic eutectic solvents (HDES) prepared by mixing an extractant trioctylphosphine oxide (TOPO) with hydrogen bond donors thymol (THY), menthol (MEN), or lauric acid (LAAC) in 1:1 ratio. The prepared HDES was used as an extractant and hydrophobic phase to recover Nd(III) and Dy(III) from magnet leachate, thus avoiding the usage of volatile organic solvents. All three HDES formulations effectively extracted Nd(III) and Dy(III) from 1 M HNO3. Notably, the THY:TOPO (1:1) composition showcased the most remarkable performance in terms of both separation factor and extraction capacity. Stripping Nd(III) and Dy(III) from loaded HDES was achieved using 2 mol/L H2SO4. Through the construction of a McCabe-Thiele diagram and the execution of counter-current experiments, the complete recovery of both Nd(III) and Dy(III) was realized. The THY:TOPO (1:1) also exhibited remarkable extraction capability for all three rare earth elements present Nd(III), Dy(III), and Pr(III) within the original scrap NdFeB magnet leachate at the optimized conditions. This study emphasizes the inherent advantages of formulating eutectic solvents by combining efficient extractants, thereby enhancing the efficiency of metal recovery processes.
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