| 摘要 |
PROBLEM TO BE SOLVED: To move an acidic ion from a solution containing the acidic ion to pure water and reliably remove the acidic ion by increasing the contacting surface are of the acidic ion and pure water by stirring and bringing the solution containing the acidic ion into contact with pure water. SOLUTION: At the time of removing, for example, fluoride ion from a solution, at first a valve 51 is closed and a valve 52 is opened and a solution sending pump 39 is operated to supply a fluoride ion-containing solution (af) to a pool tank 4 from a branched line 45. Then, a circulation route 50 is kept in a normal operation state, a valve 55 is opened and pure water (b) is supplied to the pool tank 4 from a pure water supply line 56. Successively, respective valves 57, 58, 63 are opened and the pure water b and the solution af are sucked in both suction lines 59, 60 from both outlet ports 4d, 4e and they are stirred by a solution sending pump 61 and then jetted to the pool tank 4 from both inlet ports 4b, 4c to be further stirred.
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