Repair method of electrolyzer steel shell under strong magnetic field environment

Abstract

The invention discloses a restoration method of an uninterrupted-power electrolytic bath steel case in a strong magnetic field environment. The method comprises the following steps that after the production stop of an electrolytic bath, the inner side and the outer side of a bath case are cleaned; sundries around the damaged and deformed steel case are cleanly cleared; a stress concentration point is drawn along the inner wall deformation trend of the bath case; stress elimination treatment is performed in a stress concentration position and the corbel reinforcing bar parallel stress point; the returning redundancy is calculated; the cut position is accurately positioned; a tension tool is erected, so that the steel case deformation resets; a reinforced backrest plate is additionally installed; a high-intensity screw bolt passes through a stress concentration point for fixation; screw bolts are used for fastening; a magnetism prevention device is additionally installed for welding; the periphery of the steel plate is welded onto the steel case; after a welding seam is cooled, the tension tool is released, annealing and demagnetization are performed; the restoration is completed. Compared with the existing restoration method, the method provided by the invention has the advantages that the complicated hoisting steps in the steel case repair process can be avoided; the correction restoration can be performed in the original position of the steel case; the maintenance period is greatly shortened; the work intensity and the repair cost are reduced.

Description

technical field [0001] The invention relates to a method for repairing a steel shell of an electrolytic cell under a strong magnetic field environment. Background technique [0002] The aluminum electrolytic cell is a production equipment that works in a state of high-temperature molten salt, and its cathode lining will inevitably be eroded by electrolyte and aluminum liquid. Due to the stress caused by erosion, the tank body is deformed and the inner lining is damaged (such as the side wall bulging outwards, the upper part is larger, the four corners are lifted up, the bottom of the shell is sometimes boat-shaped, and the side of the electrolytic tank is protected by the side furnace tank. , usually not easy to be damaged by electrolyte erosion. However, if the electrolytic cell has a diseased cell or other reasons, it will damage the furnace side and may cause the side wall carbon material to be corroded locally, causing the cell shell to directly contact the molten electr...

AI Technical Summary

Problems solved by technology

Under the above-mentioned maintenance technology, lifting and installing the steel shell requires a lot of manpower and material resources, and it is difficult to operate during the construction process, and the risk factor is high. It is a relatively expensive and inefficient steel shell repair method.

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