Nickel misch metal hydride batteries contain light rare earths, thus the applicability of an electrochemical method using molten salts to recycle them has been considered. To find out better the electrochemical condition for effective extraction of neodymium, the electrochemical behaviour of lanthanum, cerium and neodymium was investigated in a molten LiCl-KCl eutectic coexisting with LiF using tungsten and nickel electrodes. It was found that by using tungsten, the electro-reduction peaks of each rare earth in the cyclic voltammograms were more clarified with increasing the amount of LiF, while by using a nickel electrode, the major effect of fluoride addition on the potential of electro-reduction of rare earths could not be identified due to alloy formation of rare earths with nickel. Therefore, to co-extract rare earths from the melt bath, active electrodes are suitable but to separate neodymium from other rare earths, even inert electrodes are much suitable to be applied by the aid of species control in the electrolytes.
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