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The selectivity of crystalline (H3O)8Nb22O59 for alkali metal ions was, based on a batch method, in the order of Li+>>K+>Na+, Rb+>>Cs+ in alkaline solutions and K+>>Na+, Rb+>>Li+, Cs+ in acidic solutions at pH<3.5. The column elution of a lithium chloride solution containing 236 and 72 mg dm-3 of Na+ and K+, respectively, through the niobate bed, caused extreme decreases of Na+ and K+ concentrations to less than 0.1 mg dm-3 up to 200 and above 400 bed volumes, respectively, with rarely change of the Li+ concentration. Fractionation of lithium isotopes with the niobate was also investigated by both the batch and column methods. It had a relatively high separation factor of 1.026. The column fractionation study showed that 7Li was enriched in the front part of the elution band and 6Li in the rear part, with the maximum and minimum 7Li/6Li ratios of 15.0 and 11.2, respectively.

Purification of Lithium Chloride Solution and Fractionation Property for Lithium Isotopes of Niobate Crystal