Studies on Isotope Separation of Lithium by Electromigration in Fused Lithium Bromide and Potassium Bromide Mixture, (II):Composition of Salt in Anode Compartment

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Accurate knowledge on the salt composition in the anode compartment is indispensable when 6Li is to be highly enriched by electromigration in fused LiBr-KBr mixture. A study was made on the dependence on temperature shown by the salt composition in the anode com-partment. It was observed that sustained electromigration led to a salt composition in the anode compartment that was determined by the prevailing temperature. The composition was observed for various temperatures between 380°C and 740°C: In terms of the ratio Li/K in chemical equivalent, the values were 1.31 at 380°C, 1.29 at 420°C, 1.31 at 460°C, 1.41 at 500°C, 1.76 at 540°C, 1.82 at 580°C, 1.95 at 620°C, 2.16 at 680°C and 2.34 at 740°C. These results can be explained by assuming that the fused LiBr-KBr mixture is a system composed of two simple salts and their eutectic, and that at temperatures below 550°C, which is the melting point of LiBr, LiBr and KBr are dissolved in fused eutectic, while KBr is dissolved in the fused eutectic and LiBr at temperatures between 550° and 738°C, which latter is the melting point of KBr.
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