SPECIFIC ALKALI METAL ION ADSORBENT AND PRODUCTION METHOD FOR HIGH-PURITY LITHIUM OR HIGH-PURITY CESIUM

摘要

PROBLEM TO BE SOLVED: To provide a technique for selectively adsorbing sodium ion, potassium ion and rubidium ion from an aqueous solution in which every kinds of cations coexist.;SOLUTION: The specific alkali metal ion adsorbent comprises a compound expressed by the following formula (1) as an active principle and selectively adsorbs sodium ion, potassium ion and rubidium ion among alkali metal ions: M¹_8+xM²_xM³_22-xO_59-nH₂O (1). In the formula (1), M¹ is at least one kind of element selected from the group consisting of hydrogen element and alkali metal elements, M² is at least one kind of element selected from the group consisting of metal elements capable of becoming tetravalent metal ions and M³ is at least one kind of element selected from the group consisting of metal elements capable of becoming pentavalent metal ions. Therein, a subscript (x) in the formula (1) is a number satisfying 0≤x≤11 and (n) is a number satisfying 0≤n≤12.;COPYRIGHT: (C)2005,JPO&NCIPI