METHOD AND APPARATUS FOR REMOVING ION PRESENT IN SOLUTION BY THE CRYSTALLIZATION METHOD

摘要

The present invention aims to provide processes and apparatuses for removing ions in liquids by crystallization, which can achieve efficient and stable performance in removing ions in liquids. To achieve the object above, the present invention provides a process for removing an ion to be removed in an influent by crystallization, comprising supplying the influent and an ion capable of reacting with the ion to be removed to form a slightly soluble salt to each crystallization reactor of a multistage crystallization apparatus comprising two or more crystallization reactors to grow crystalline particles of a slightly soluble salt of the ion to be removed, and successively transferring the crystalline particles grown in a crystallization reactor at an earlier stage to the crystallization reactor at the subsequent stage so that crystalline particles having larger average particle diameters are flown in reactors at later stages.