| 摘要 |
PURPOSE:To recover metallic ions as metallic powder and to treat liquid for using circulatory or for discharging, by partitioning an electrodialysis cell with both cationic and anionic ion exchange membranes, putting liquid contg. metallic ions in the central partitioned chamber, and performing electrodialysis. CONSTITUTION:An electrodialysis cell is partitioned to three chambers by both ion exchange membranes of a cation exchange membrane 5 mounted with a louver 7 for preventing sticking of deposits and an anion exchange membrane 6. Electrolytes such as dilute acids, dilute alkalis or salt solns. thereof according to the kinds of the liquid to be treated are put into cathodic and anodic dialysis chambers 18, 19 provided with a cathode electrode plate 2 and an anode electrode plate 1, and waste liquid contg. metallic ions in a high concn. generated from a treating state for metallic surface such as etching or the like is put into the central dialysis chamber 17. While these liquids are circulated with pumps 9, 14, 15, and while the plate 2 mounted to an electrode bar 3 is oscillated with a locking device 4, electric current is flowed to both plates 1, 2 whereby electrodialysis is accomplished and the metallic ions are recovered as the metallic powder having high purity from the surface of the cathode 2. |
