발간논문

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Vol.31, No.9, 1156 ~ 1162, 1993
Title
A Study on the Production of Nd - Fe Mother Alloy from Nd2O3 by the Molten Salt Electrolysis
남상욱 , 백영현 Sang Uk Nam , Young Hyun Paik
Abstract
An attempt was made to reduce Nd₂O₃ electrolytically in a fluoride bath. Neodymium metal was electrodeposited on the iron cathode to produce the Fe-Nd eutectic alloy in a liquid state at operating temperatures. Graphite was adopted for the anode and pure iron for the cathode. The Nd₂O₃ feed was prepared by dissolving into cryolite to increase the solubility of Nd₂O₃ in fluoride electrolyte. The premelt thus made had the composition of Na₃AlF_6 50wt.%, AlF₃ 34wt.% and Nd₂O₃ 16wt.% The constituents of fluoride electrolyte were NdF₃, LiF and BaF₂ which were electrochemically very stable. All the experiments were carried out in the absence of oxygen, as well as H₂O. Analysis of alloy product showed Nd 87.6wt.% Fe 11.6wt.% and Al 0.14wt.% in an optimum operating condition with the feed rate of 3.25g/hr at the temperature of 900℃ and cathode current density 3.0A/㎠. Experimental results proved that the cryolite based premelt was suitable for the electrolysis of rare earth oxide in a fluoride bath due to their prominent solubilities.
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