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ePaper created 2016-03-17, 15:06:18 | version 1.45.01
89 40 60 8020 Dr. rer. nat. Uwe Vohrer Phone + 49 711 970-4134 uwe.vohrer@igb.fraunhofer.de Dr. rer. nat. Thomas Schiestel Phone + 49 711 970-4164 thomas.schiestel@igb.fraunhofer.de Contact Funding The Fraunhofer-Gesellschaft intends to strengthen Germany as a center for commerce by rapidly transforming original scientific ideas into marketable products through the Lighthouse Project initiative. Project partners Fraunhofer institutes IMWS, IWM, IWU, IWKS, IGB, IFAM, ISI, LBF Further information www.seltene-erden.fraunhofer.de The neodymium adsorptive capacity of a membrane loaded with phosphonate particles at 30 percent and 40 percent by weight, respectively, compared to an unloaded reference membrane is shown in Fig. 2. Summary: It was shown that functionalized membrane adsorbers can be used to concentrate dilute neodymium solutions by a factor of 100. The membrane adsorption is completely reversible. A certain selectivity in separating neo- dymium and dysprosium can be achieved with desorption. Free-flow electrophoresis (FFE) Ions can be deflected and separated by an electric field in free-flow electrophoresis ig shows successful separation of a neodymium-dysprosium-iron mixture. An eluate from the membrane adsorption process served as the sample. EDTA was used as the complex ligand in a ratio of one-to-one with dysprosium and iron. HCl and KCl in a 3.25 mM acetate buffer was employed as the separation medium The field strength was 139.5 V/cm and the residence time 90 seconds. More- over, a three-fold increase of the lab-scale reactor was able to be implemented (Fig. 4). Summary: It was shown that rare earth metals as well can be separated from one another by means of optimi ed free-flow electrophoresis. In addition to proof of concept, a scale-up of the facility by a factor of three was successfully implemented. 1 Particles with differing functional groups were em- ployed in the membrane adsorbers. 2 Adsorption of neodymium by particles with PO3H– functional groups. 3 Separation of Fe, Nd, and Dy from eluate of membrane adsorption by means of FFE. 4 Free-flow electrophoresis prototype. 3 4 proportionofinitialmetalquantityin% CATHODE ANODE trial number 0 50 10 20 30 40 Fe fraction in % Nd fraction in % Dy fraction in % 0 40608020 Phone + 49711970-4134 Phone + 49711970-4164 34