Productive cell shutting method of aluminum cell

Abstract

The invention relates to the aluminum electrolytic cell technical field, in particular relating to a protective cell-shutting method of an aluminum electrolytic cell. The method aims to solve the problems of cracking, deformation and doming up, etc. caused by an inner lining directly exposed in the air during the prior cell shutting, and comprises the following steps that: (1) part aluminum liquid inside an electrolytic cell is pumped out at first; (2) then, part electrolyte liquid inside the electrolytic cell is taken out; (3) an anode is put into the aluminum liquid and is raised after all aluminum liquid is pumped out, and thermocouples are distributed inside the electrolytic cell; (4) the surface of the anode is provided with an alumina heat-preservation material, and a feeding port and an aluminum outlet are sealed closely; moreover, a cell cover plate is covered; (5) a purifying smoke evacuation pipe is closed, and rockwool is used to cork up a side heat dissipation hole of a basin and to carry out bottom heat preservation; a factory building, a trench window and an air grid section are closed, and a window inside a closed workshop is closed; and (6) when temperature inside the electrolytic cell is lowered to normal temperature, cell shutting is completed. The protective cell-shutting method ensures reasonable gradient lowering of the temperature of an electrolytic cell inner lining, and reduces inner lining damage caused during cell shutting; meanwhile, the method has better anodic protection, strong commonality, simple operation and outstanding effects, and can continue to be used.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolytic cells, in particular to a method for protective shutdown of aluminum electrolytic cells. Background technique [0002] The large-scale prebaked anode electrolytic cell is the main equipment for electrolytic aluminum production, and its operation is directly related to the production efficiency of electrolytic aluminum. Since the electrolytic aluminum industry is a high-energy-consuming industry, it is often encountered that the electrolytic cell is stopped and restarted in the event of insufficient power supply or an accident, or the electrolytic cell needs to be stopped and overhauled after reaching a certain service life. It is well known that the shutdown of the electrolytic cell directly affects the cleaning and repair of the electrolytic cell, plays a decisive role in the success of the second start of the electrolytic cell and the prolongation of the service life of the cathode...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the lining of the electrolytic cell is directly exposed to the air without taking appropriate and reasonable protective measures when the existing aluminum electrolytic cell is stopped, so that cracks, deformations, and bulges appear in the liner of the electrolytic cell, an aluminum electrolytic cell is provided. Protective stop method of tank