Separation of Praseodymium by Electrolytic Oxidation in Fused Hydroxide Melts:Studies on the Chemical Analysis of the Rare Earth Elements. X
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概要
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In the fractional separation of Pr, the fraction of Pr containing Nd is tested under fusion by electrolytic oxidation method. The result indicates that the separation s simple under a certain condition, especially when the content of Pr oxide is over 50%, the precipitate is consisted of higher oxides of Pr of high purity. In this method, the sample of Pr oxide containing Nd is converted into hydroxide fused in KOH containing a definite amount of water and the higher oxides of Pr are precipitated by electrolytic oxidation together with a small amount of hydrated oxide of Nd as a solid solution, in which the purity of higher oxide of Pr is over 95%. Thus, a crude Pr fraction containing Nd obtained by usual fractional crystallization can easily be separated and concentrated by repeating several times of this method and the coefficient of concentration is superior in comparison with the other methods. The determination of active oxygen in Pr higher oxides is made by iodimetry, and the determinations of Pr and Nd in each fraction are made by spectrophotometric method.
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