Cleaning method of anode net of ionic membrane electrolysis bath

Abstract

The invention discloses a cleaning method of an anode net of an ionic membrane electrolysis bath. Through the method, a compound scale layer on the surface of the anode net can be effectively removed, a surface coating of the anode net can be prevented from being damaged, and a voltage of the electrolysis bath can be lowered. The method includes the steps of carrying out pre-cleaning and leakage testing on a cleaning bath through pure water and placing the electrolysis bath into the cleaning bath after a cathode and an anode of the electrolysis bath are pressed by plastic membranes at an interval; preparing a primary cleaning agent through the pure water, heating the primary cleaning agent to 55-85 DEG C, then cleaning the anode net of the electrolysis bath for 1-4 hours, draining the primary cleaning agent and adding the pure water for flushing, wherein the primary cleaning agent is composed of 2-6% of hydrochloric acid and 0.2-0.3% of lan-826 corrosion inhibitors in concentration percentage; and preparing a secondary cleaning agent through the pure water, heating the secondary cleaning agent to 55-85 DEG C, then cleaning the anode net of the electrolysis bath for 4-6 hours, draining the secondary cleaning agent and adding the pure water for flushing, wherein the secondary cleaning agent is composed of 3-8% of citric acid, 0.2-0.35% of lan-826 corrosion inhibitors and 3-6% of sulfamic acid in concentration percentage.

Description

Technical field [0001] The invention relates to the field of chlor-alkali chemical industry, in particular to a method for cleaning the anode net of an ion-exchange membrane electrolyzer. Background technique [0002] During the production process of ion-exchange membrane electrolyzers, the anode net is in contact with refined brine for a long time. The iron content of refined brine in the chlor-alkali industry has long been greater than 20ppm, and there is still a certain amount of calcium and magnesium in the refined brine. A large amount of iron, calcium, and magnesium compounds will be deposited on the surface, which will damage the surface coating of the anode mesh and form a scale layer. The scale layer produced by the anode mesh will age the ion membrane, which will cause the voltage of the electrolytic cell to increase, the current efficiency to drop, and the production power consumption. A substantial increase. Summary of the invention [0003] The technical problem to b...

AI Technical Summary

Problems solved by technology

[0002] During the production process of the ion-exchange membrane electrolyzer, the anode grid has been in contact with the refined brine for a long time. The iron content of the refined brine in the chlor-alkali industry has been greater than 20ppm for a long time, and there is still a certain amount of calcium and magnesium in the refined brine. A large amount of iron, calcium, and magnesium compounds will be deposited on the surface, destroying the surface coating of the anode mesh and forming a scale layer, and the scale layer of the anode mesh will cause the aging of the ion membrane, resulting in an increase in the voltage of the electrolyzer, a decrease in current efficiency, and a decrease in production power consumption. A substantial increase