Enrichment of Li‐6 by Countercurrent Electromigration in Molten LiNO3

High enrichment of 6 Li was attempted by improvement a previously used countercurrent electromigration method in molten LiNO 3 . In order to prevent a possible outflow of Li + ions into a large cathode compartment which contained NH 4 NO 3 melt by electromigration, a small zone of NaNO 3 was formed between molten LiNO 3 and NH 4 NO 3 in a separation tube. The electromigration cell was reformed so that the temperature in the separation tube could be kept at an intended value. 6 Li was enriched from 7.4 to 91.2% in 39 days without any trouble with material corrosion.