[Figure 3] (IMAGE)
Caption
Superior industrial applicability of rare earth metal recovery fibers / Practical applicability of the recovery material to the process of rare earth recovery from discarded permanent magnets. (a) Plot of the composition of each ion as a function of pH for an initial concentration ratio of 65 (Fe):25 (Nd):10 (Dy). (b) Partition coefficients (Kd) for the adsorption performance of the fiber material for three metal ions, predicting selective rare earth recovery using the adsorption material. (c) The adsorption reactor filled with the adsorption material exhibits a significantly lower pressure drop (faster mass transfer rate) than the module filled with the same weight of granular powder. Internal images show reactors filled with each material. (D) The ratio of the initial maximum adsorption amount (QM) of the material before regeneration to the maximum adsorption amount after repeated regeneration (QM,R) is shown. Nearly 100% material regeneration performance is maintained up to 3 regenerations. (e) XRD pattern of NPZIF-8 after regeneration, showing the crystal structure collapse of NPZIF-8 after 4 regenerations. (f) Electron microscopy image of NPZIF-8 nanoparticles on the surface of CSCF adsorbent after 5 regenerations. (Scale bar: 1 μm)
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Korea Institute of Science and Technology
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