Due to the high concentration of calcium and magnesium ions in the electrolytic solution, the titanium electrode cathode is prone to scaling after a period of electrolysis. The treatment method is as follows:
1. In order to reduce sedimentation and scaling, the raw water is softened to remove suspended solids, certain colloidal substances, and organic impurities. This can prevent or reduce sedimentation and scaling, and pre-treatment can also be performed to remove the hardness of the raw water, effectively preventing the formation of scaling.
2. Pickling method: there is always a small amount of precipitated scale generated during the operation of electrodialysis, especially in areas with poor water quality. After the accumulation to a certain extent, pickling treatment is required. According to the situation, regular pickling treatment is a simple and effective method to eliminate sedimentation without dismantling the equipment. The cycle depends on the actual situation, usually cleaning with 1% to 2% hydrochloric acid circulation.
3. Use reverse electrode: Regularly reverse the electrode to change the direction of ion migration. According to actual situations, the electrode is usually reversed every 2-8 hours. In recent years, automatic electrode swapping has been frequently used both domestically and internationally for about 15-30 minutes. In this way, even slight precipitation can be effectively removed. However, frequent reverse electrode swapping requires high quality of the nail electrode and a high loss of titanium electrode. It is necessary to choose high-quality Electrode materials with strong corrosion resistance.
