RECOVERING METHOD OF INDUSTRIALLY USEFUL INORGANIC MATERIAL AND INDUSTRIALLY USEFUL INORGANIC MATERIAL RECOVERED BY THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a method to recover an industrially useful inorganic material, which enables recovering an industrially usable high purity alkali metal salt containing no needless components such as heavy metals, and the industrially useful inorganic material recovered by the recovering method. SOLUTION: The method includes a process for making waste water harmless by removing the heavy metals contained in waste water, an electrodialyzing process for separating and recovering concentrated water containing a univalent ion from the treated water by an electrodialyser possessing a univalent ion selective ion exchange membrane and a process for separating and recovering the inorganic material as the alkali metallic salt such as sodium chloride (NaOH), potassium chloride (KCl) by the crystallization of the recovered water.