| 摘要 |
PROBLEM TO BE SOLVED: To provide a recovery process of a high purity inorganic aqueous solution reducing the concentration of metal ions by electrodialysis using an electrodialyser constructed of using a bipolar membrane. SOLUTION: The recovery process comprises arranging the bipolar membrane B and an anion exchange membrane A between a positive electrode and a negative electrode, using the electrodialyser having a positive electrode side chamber 12 and a negative electrode side chamber 11 formed by partitioning a pair of bipolar membranes B with the anion exchange membrane A, supplying an inorganic acid waste liquid containing the metal ions to the negative electrode side chamber 11 as a treated liquid, supplying water or the high purity inorganic aqueous solution to the positive electrode side chamber 12 as a recovery medium liquid, by performing the electrodialysis in this state, selectively transferring a conjugate base from the negative electrode side chamber 11 to the positive electrode side chamber 12 to increase the concentration of the inorganic acid in the recovery medium liquid, and recovering the recovery medium liquid from the positive electrode side chamber 12 as the high purity inorganic acid aqueous solution. COPYRIGHT: (C)2007,JPO&INPIT
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