Intensified Nd extraction in small channels for NdFeB magnet recycling
Intensified Nd extraction in small channels for NdFeB magnet recycling
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小通道强化 Nd 提取，用于 NdFeB 磁体回收
DOI：
10.1016/j.seppur.2022.122958
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发表时间：
2023
影响因子：
8.6
通讯作者：
Pheasey C
中科院分区：
文献类型：
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作者：
Pheasey C
在小通道接触器中，通过溶解在离子液体 1-丁基-3-甲基咪唑鎓双（三氟甲磺酰基）亚胺 [C 4 mim][Tf 2 N] 中的三辛基氧化膦 (TOPO) 连续从水溶液中萃取钕 (Nd)。动力学研究证实了 0.001 M 硝酸水相中 0.005 和 0.01 M 初始 Nd 浓度下的 1: 6 Nd: TOPO 萃取机制。在直径为0.5和1 mm的通道中进行连续流动萃取，研究了混合物速度和停留时间对萃取效率和传质系数的影响。在等相混合物速度下，流型研究强调了两个通道的混合物速度为 0.01 至 0.05 m/s 时的塞流状态，导致 0.5 mm 通道中的界面面积高达 4900 m 2/m 3 ，1 mm 通道中的界面面积高达 2500 m 2/m 3 。停留时间为 37.5 s 后，在 0.5 mm 通道中，当 KL α 为 0.09 s−1 时，萃取效率为 80%；在 1 mm 通道中，当 KL α 为 0.04 s−1 时，萃取效率为 70%。在间歇系统中，1-2 小时即可达到相同的提取效率。
Neodymium (Nd) was continuously extracted from aqueous solutions by trioctylphosphine oxide (TOPO) dissolved in the ionic liquid 1-Butyl-3-methylimidazolium Bis (trifluoromethanesulfonyl) imide [C 4 mim][Tf 2 N] in small channel contactors. Kinetic studies confirmed a 1: 6 Nd: TOPO extraction mechanism at high initial Nd concentrations of 0.005 and 0.01 M in a 0.001 M nitric acid aqueous phase. The continuous flow extractions were carried out in channels with 0.5 and 1 mm diameter and the effects of mixture velocity and residence time on the extraction efficiency and the mass transfer coefficient were investigated. At equal phase mixture velocities, the flow pattern studies highlighted a plug flow regime at mixture velocities of 0.01 to 0.05 m/s for both channels, resulting in interfacial areas of up to 4900 m 2/m 3 in the 0.5 mm channel and 2500 m 2/m 3 in the 1 mm channel. After 37.5 s residence time, extraction efficiencies of 80% were found in the 0.5 mm channel at a K L α of 0.09 s− 1 and 70% at 0.04 s− 1 in the 1 mm channel. The same extraction efficiencies were achieved in 1–2 h in the batch systems.