| 摘要 |
PROBLEM TO BE SOLVED: To provide an exchanging method of ions which are difficult for ion exchange, to provide a method to efficiently exchange ions while precisely controlling the ion exchange rate without using a large amt. of an expensive ion source, especially to provide an ion exchanging method to produce an expensive lithium-crystalline zeolite at a low cost while controlling the lithium ion exchange rate with good accuracy. SOLUTION: An ion exchange column is packed with an A ion exchanger or an A ion and B ion exchanger. A part or the whole of the A ion in the A ion exchanger, or a part or the whole of the A ion and B ion as ions in the A ion and B ion exchanger are exchanged by a fixed bed flow method with C ion having <1 ion exchange equilibrium const. K to obtain a C ion exchanger. In this ion exchanging method, a one-pass soln. containing C ion is subjected to one-pass process, then a one-pass detergent liquid without containing A ion, B ion or C ion is passed in the same passing direction, and then a circulation soln. containing C ion is circulated. |
