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- W2594499786 abstract "Dysprosium and iron were selected as a heavy rare earth metal and a major impurity in the practical feed solution and the solvent was kerosene solution of mono (2-ethylhexyl) 2- ethylhexylphosphonate (PC-88A). Firstly, each equilibrium of the metals between aqueous and organic phases was reconfirmed under various pH conditions. The equilibriums of all the metals followed the conventional simple model and the equilibrium constant increased in the order of neodymium in our previous study, dysprosium, and iron, in the range of this work. In the second, the continuous solvent extraction of the metal from the aqueous feed solution were conducted using a standard type stirring vessel, which measured 0.08 m in inner diameter and height, and was equipped with a 6-flat-balde paddle type impeller and four baffles. The pH, flow rate of the aqueous feed phase, and stirring velocity were varied in order to study the mass transfer of the metal in the vessel with the assumption of equilibrium state at the liquid-liquid interface. The resistances to mass transfers of rare earth metals were almost the same and the location of resistances controlling the overall mass transfers shifted from the organic solvent to the aqueous feed phase side, as the distribution ratios of the metals increased. The resistance to the iron mass transfer was much higher than those of the rare earth metals under the above assumption, so that it was predicted that the iron mass transfer was governed also by the reaction at the liquid-liquid interface." @default.
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- W2594499786 date "2015-09-01" @default.
- W2594499786 modified "2023-09-23" @default.
- W2594499786 title "Solvent extraction of rare earth metal using continuous stirred vessel" @default.
- W2594499786 hasPublicationYear "2015" @default.
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