Molten-salt Electrolysis of Neodymium from a Chloride Electrolyte.
Ppr Rare Earths: Extrac Prepar & Appl Miner Met and Mater Soc 1988 :369-376
Neodymium metal was electrowon by the U.S. Bureau of Mines from a molten-chloride electrolyte at 650 deg c using a molten-metal cathode. A 50 mol pct ndcl3-50 mol pct kcl mixture served as the electrolyte. Binary metal alloys of mg with zn and mg with cd were used as molten cathodes. Under the best conditions, current efficiencies were 90 pct with an mg-zn cathode and 80 pct with an mg- cd cathode. Vacuum distillation was performed at 1,100 deg c for 30 min under a vacuum of 10-3 torr to separate the cathode metals from the neodymium. Neodymium metal of 99.9+ pct purity was recovered from the mg-cd alloy cathode. Almost 2 pct zn remained in the neodymium recovered from the mg-zn alloy.
Ppr Rare Earths: Extrac., Prepar., & Appl.; Miner., Met., and Mater. Soc., 1988, PP. 369-376