Water scale cleaning method for cooler cooling water pipeline in aluminum hydroxide production system

The invention relates to a water scale cleaning process for equipment used in aluminum hydroxide production, namely a water scale cleaning method for a cooler cooling water pipeline in an aluminum hydroxide production system. The cooling water pipeline is connected with a water supply pipeline of the production system. The cleaning process includes: a, configuring a certain amount of NaOH solution for 10% - 60% of mass fraction, placing in a container, and heating till 80 DEG C to 90 DEG C and insulating heat for standby application; b, completely placing the cooling water pipeline to the NaOH solution prepared in the step a for 4 to 8 days before taking out; c, using a drill or a steel bar to clean the inner wall of the cooling water pipeline processed in the step b along the path of the cooling water pipeline till 80% - 95% of water scale is removed for standby application; d, using water to wash the cooling water pipeline processed in the step c. According to the process, cleaning effect is fine, waste water after cleaning can be used for production circulation, and environment pollution and energy efficiency are realized.