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

Abstract

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.

Description

technical field [0001] The invention relates to a scale cleaning process on equipment used in the aluminum hydroxide production process, in particular to a scale cleaning method for the cooling water pipeline of the cooler in the aluminum hydroxide production system. Background technique [0002] The condenser is a cooling device, which usually uses circulating water to exchange the heat of the substance to be cooled with the heat of the cooling water, so as to discharge the heat of the substance to be cooled. Aluminum hydroxide production plants often use condensers to cool slurry or equipment oil in the production process. Since the production water of aluminum hydroxide plants will be incorporated into the alkaline substances in production after repeated cycles, the condenser uses this alkaline water When the circulating water is cooled, a large amount of alkaline scale will be formed on the pipe wall. The main component of these alkaline scales is Mg(OH) 2 , Al(OH) 3 ,...

AI Technical Summary

Problems solved by technology

Aluminum hydroxide production plants often use condensers to cool slurry or equipment oil in the production process. Since the production water of aluminum hydroxide plants will be incorporated into the alkaline substances in production after repeated cycles, the condenser uses this alkaline water When the circulating water is cooled, a large amount of alkaline scale will be formed on the pipe wall. The main component of these alkaline scales is Mg(OH) 2 , Al(OH) 3 , CaCO 3 etc. The long-term deposition of scale will seriously hinder the normal operation of the condenser, so the condenser needs to be cleaned regularly. The traditional condenser cleaning method is to inject weak acid liquid into the condenser, and use a drilling rig or The internal scale is removed by steel brazing to achieve the purpose of removing scale, but this treatment method has great defects, that is, when the weak acid solution dissolves the scale, it will also corrode the tube wall of the condenser to a certain extent At this time, when the scale is removed with a drilling rig or a steel drill, the tube wall of the condenser will be damaged, which will cause great inconvenience to the cleaning work. In severe cases, the condenser will be damaged, causing great losses to daily production.