| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for performing electric dialysis in stable state over an extended time period owing to absence of scale deposition onto the surface of ion-exchange membrane during electric dialysis, when manufacturing a dealkalized water glass solution preferably used as a ground improver by dealkalizing a water glass solution through electric dialysis using ion exchange membrane. SOLUTION: In a method for manufacturing a dealkalized water glass solution by using an electric dialysis apparatus formed by arranging desalting chambers and concentrating chambers, one after the other, wherein cation exchange membranes and anion exchange membranes being arranged between anode and cathode, one after the other, and in the desalting chambers, anode side and cathode side being partitioned with anion exchange membrane and cation exchange membrane, respectively, and in the concentrating chambers, anode side and cathode side being partitioned with cation exchange membrane and anion exchange membrane, respectively, and by performing the electric dialysis by feeding the water glass solution into the desalting chambers, the method which performs the electric dialysis by making the water glass solution and the concentrated solution have 10 ppm or less metal ions other than sodium, potassium, lithium, iron, and titanium. |
