Electrolytic tank production process

Abstract

The invention provides an electrolytic tank production process including normal-period management and abnormal-period management; the abnormal-period management is divided into starting initial-period management and starting final-period management. The invention discloses a blanking method for aluminum oxide continuous blanking and parameters thereof, and also discloses parameter values in electrolyte height control, electrolyte composition control, aluminum water height control and voltage management of the starting final-period management in the abnormal-period management of electrolytic tank production. Compared with the related technology, with use of the electrolytic tank production process, the fluctuation range of an aluminum oxide concentration value is small, and the problems that due to relatively large of the single-time aluminum oxide blanking quantity, a part of alumina is too late to dissolve, sinks into liquid aluminum or a furnace bottom and is stacked on a cathode, as a result that, the cathode resistance is increased, the cathode voltage drop is increased and electrolysis energy consumption is increased are solved. Therefore, the current efficiency is improved, furnace bottom precipitates are reduced, the furnace bottom voltage drop is reduced, and energy consumption is saved.

Description

【Technical field】 [0001] The invention relates to the technical field of aluminum electrolysis, in particular to an electrolytic cell production process. 【Background technique】 [0002] In related technologies, in the production of aluminum electrolytic cell, the 300kA electrolytic cell adopts intermittent alumina feeding method for electrolytic aluminum production, that is, 1.2kg of alumina is dropped every 150s or so. [0003] Usually, the management during the period from the start-up of the electrolyzer to the normal production is called the abnormal period management. The time is generally about 3 months. During this period, reasonable process parameters can be set to obtain a regular furnace. Abnormal period management can be divided into start-up initial management and start-up post-management. [0004] Initial start-up management refers to the management during the period from the extinguishment of the artificial effect to the first aluminum tapping after the start-...

AI Technical Summary

Problems solved by technology

[0011] Disadvantages of the present technology: 1) Interval feeding is adopted, with a large amount of feeding at a time, obvious fluctuations in the concentration of alumina, low concentration before feeding, high concentration after feeding, and large fluctuations in the heat balance of the tank, which affects the stability and stability of the electrolytic cell. current efficiency

2) A large amount of aluminum oxide is cut in a single time, and part of the alumina is too late to dissolve and sinks into the aluminum liquid or the bottom of the furnace

Alumina sinking to the bottom of the furnace accumulates on the cathode, resulting in an increase in cathode resistance, an increase in cathode voltage drop, and an increase in electrolysis energy consumption