naa a22 4500 51077119X CHVBK 20180411083214.0 cr unu---uuuuu 180411e20131001xx s 000 0 eng 10.1007/s11837-013-0659-3 doi (NATIONALLICENCE)springer-10.1007/s11837-013-0659-3 An Environmentally Friendly Process Involving Refining and Membrane-Based Electrolysis for Magnesium Recovery from Partially Oxidized Scrap Alloy [Elektronische Daten] [Xiaofei Guan, Uday Pal, Adam Powell] Magnesium is recovered from partially oxidized scrap alloy by combining refining and solid oxide membrane (SOM) electrolysis. In this combined process, a molten salt eutectic flux (45wt.%MgF2-55wt.% CaF2) containing 10wt.%MgO and 2wt.% YF3 was used as the medium for magnesium recovery. During refining, magnesium and its oxide are dissolved from the scrap into the molten flux. Forming gas is bubbled through the flux and the dissolved magnesium is removed via the gas phase and condensed in a separate condenser at a lower temperature. The molten flux has a finite solubility for magnesium and acts as a selective medium for magnesium dissolution, but not aluminum or iron, and therefore the magnesium recovered has high purity. After refining, SOM electrolysis is performed in the same reactor to enable electrolysis of the dissolved magnesium oxide in the molten flux producing magnesium at the cathode and oxygen at the SOM anode. During SOM electrolysis, it is necessary to decrease the concentration of the dissolved magnesium in the flux to improve the faradaic current efficiency and prevent degradation of the SOM. Thus, for both refining and SOM electrolysis, it is very important to measure and control the magnesium solubility in the molten flux. High magnesium solubility facilitates refining whereas lower solubility benefits the SOM electrolysis process. Computational fluid dynamics modeling was employed to simulate the flow behavior of the flux stirred by the forming gas. Based on the modeling results, an optimized design of the stirring tubes and its placement in the flux are determined for efficiently removing the dissolved magnesium and also increasing the efficiency of the SOM electrolysis process. TMS, 2013 Guan Xiaofei Division of Materials Science and Engineering, Boston University, 02446, Brookline, MA, USA aut Pal Uday Division of Materials Science and Engineering, Boston University, 02446, Brookline, MA, USA aut Powell Adam INFINIUM Inc, 01760, Natick, MA, USA aut JOM Springer US; http://www.springer-ny.com 65/10(2013-10-01), 1285-1292 1047-4838 65:10<1285 2013 65 11837 https://doi.org/10.1007/s11837-013-0659-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11837-013-0659-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Guan Xiaofei Division of Materials Science and Engineering, Boston University, 02446, Brookline, MA, USA aut NATIONALLICENCE 700 1- Pal Uday Division of Materials Science and Engineering, Boston University, 02446, Brookline, MA, USA aut NATIONALLICENCE 700 1- Powell Adam INFINIUM Inc, 01760, Natick, MA, USA aut NATIONALLICENCE 773 0- JOM Springer US; http://www.springer-ny.com 65/10(2013-10-01), 1285-1292 1047-4838 65:10<1285 2013 65 11837 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer