A concentration of 0.2 M AOT in n-dodecane was used to form a third phase in the extraction/pre-concentration of Nd from an aqueous solution using LLX. At and above an initial Nd concentration of 12 mM, third phase formed. As the initial concentration of the Nd increased, more Nd was extracted from the aqueous phase. Post-extraction washing of the organic phase resulted in approx. 56% of the Nd being accounted for. ICP will be used to determine if there is Nd in the third phase. Below an initial Nd concentration of 10 mM, third phase did not form and Nd was extracted. Post-extraction washing of the organic phase resulted in approx. 90% of the Nd being account for.
Electrochemical impedance (EIS) technique was used to determine the effect of molar content of water, Wo, and temperature on the reverse micelle solution conductivity. Results showed that as Wo increases, conductivity increases until the reverse micelles burst and form a biphasic system. Addition of HDEHP caused a significant drop in solution conductivity. Temperature has a mild effect on increasing the conductivity. Limited to applying 7 V, electrochemical extraction showed small improvement in Nd extraction percent over traditional LLX. The extraction percent of Nd in a liquid-liquid extraction cell containing reverse micelles and the mechanism of electrochemical modulated liquid-liquid metal ion extraction will be discussed.