Control method for clearing up furnace hearth of aluminum cell

Abstract

The invention discloses a control method for clearing up a furnace hearth of an aluminum cell. The steps are as follows: reducing the opening degree of a smoke valve of the electrolytic cell, regulating the opening degree of the smoke valve of the aluminum cell to be 10-70 degrees, regulating the additive amount of aluminum fluoride in electrolyte, controlling the molecular ratio to be 2.4-2.6, controlling the temperature of the electrolytic cell to be 958-968 DEG C and the degree of overheat to be 10-15 DEG C, and keeping the regulating time for 15-60 days; after regulating for 20-30 days, increasing the opening degree of the smoke valve, regulating the opening degree of the smoke valve to be 30-80 degrees, and regulating the voltage and aluminum level of the aluminum cell; controlling the voltage of the aluminum cell to be between 3.76V and 3.95V and regulating the aluminum level to be 23-28 cm; and regulating the molecular ratio of the aluminum cell to be 2.3-2.4, and controlling the temperature of the aluminum cell to be 950-960 DEG C and the degree of overheat to be 6-10 DEG C. The control method can improve the distribution uniformity of the current in the electrolytic cell, and improve the current efficiency and the stability of the electrolytic cell.

Description

technical field [0001] The invention relates to a control technology of aluminum electrolysis, in particular to a control method of a regular furnace of an aluminum electrolysis cell. Background technique [0002] The furnace of the Hall-Elu aluminum electrolytic cell is an important part of the electrolytic cell and the foundation of the entire electrolysis process. It can automatically adjust the heat balance within a certain range through the solidification and melting of the electrolyte crust. When the heat income is less than the heat expenditure, the temperature of the electrolytic cell decreases, and the electrolyte begins to solidify to form a new furnace, and a large amount of heat is released during the solidification process, which slows down the temperature drop of the electrolytic cell and finally reaches a new heat balance. Conversely, when the heat income is greater than the heat expenditure, the temperature of the electrolytic cell rises, and the electrolyte...

AI Technical Summary

Problems solved by technology

A regular furnace can ensure the stable operation of the electrolytic cell, and can effectively protect the artificial legs and side carbon blocks, prevent them from being oxidized and damaged, and reduce the occurrence of sick cells; the irregular furnace makes the operation of the electrolytic cell worse, which is manifested as: anode Uneven current distribution, more voltage swings, and lower current efficiency, which shortens the service life of the electrolyzer

[0004] At present, during the operation of the electrolytic cell, many electrolytic cells do not form a regular furnace structure, and because the electrolysis process is relatively complicated, there are many factors that affect the furnace structure. In actual production, there is almost no control method that can make the electrolytic cell The hearth forms a regular structure