Add time:07/18/2019         Source:sciencedirect.com

The extraction of neodymium from didymium nitrate solution (a mixture of 83% Nd, 15% Pr and 2% other rare earths) by quaternary amine (Aliquat 336) was studied in a 45-stage tube-type mixer-settler. Six different banks in the system were used for solvent pretreatment, neodymium-stripping, feed-loading, neodymium-loading, NdPr partition and protactinium-stripping. The organic phase containing 0.6 M Aliquat 336 was equilibrated with NH4NO3 solution before entering the neodymium-loading bank, then partially fed to NdPr partition bank after extracting neodymium ions from aqueous solution, which contained diethylenetriamine pentaacetic acid as chelating agent. The other part of organic phase loaded with neodymium ions was stripped with dilute HNO3, and 95% of the neodymium with high purity (>99%) was recovered. In the praseodymium stripping bank, about 80% protactinium mixed with cerium, lanthanum and neodymium was obtained in aqueous solution.

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