Method for stabilizing continuous production of 400 KA aluminum electrolytic cell

Abstract

The invention provides a method for stabilizing continuous production of a 400 KA aluminum electrolytic cell. The method includes the following steps that firstly, the working voltage of the 400 KA aluminum electrolytic cell is increased to 10 mV to 15 mV, the temperature of the 400 KA aluminum electrolytic cell is 935-940 DEG C, the temperature of the ledge of the cell is 300-350 DEG C, the electrolysis temperature is increased to 939-943 DEG C, and heat insulation of the 400 KA aluminum electrolytic cell is strengthened; secondly, the molecular ratio is controlled to be increased to 2.55-2.60 from 2.45-2.50, and the adding amount of aluminum fluoride is reduced by 20-40 weight percent; thirdly, a discharging NB interval is adjusted, and the concentration of aluminum oxide is reduced to 1.5-2.0%; and fourthly, the automatic control rate of the 400 KA aluminum electrolytic cell is increased to 95-99% from 70-80%, and the effect coefficient of the 400 KA aluminum electrolytic cell is adjusted to be 0.03-0.05 from 0.1. According to the method, the service life of the electrolytic cell is prolonged, energy is saved, production stability of the electrolytic cell is improved, and efficient and stable production of the electrolytic cell is ensured.

Description

technical field [0001] The invention belongs to the technical field of electrolytic aluminum energy-saving technology, and in particular relates to a method for stabilizing the continuous production of a 400KA aluminum electrolytic cell. Background technique [0002] As electrolytic aluminum is a high-energy-consuming industry, reducing power consumption has always been a technical and management goal for the aluminum industry to reduce costs. In recent years, the state has become more and more strict on the electrolytic aluminum industry, the industry access standards have become higher and higher, and the competition among enterprises has become increasingly fierce. Many aluminum factories have adopted low-temperature and low-voltage production processes to reduce power consumption. The raw material alumina powder contains a certain amount of lithium salt and potassium salt. With the continuation of the electrolysis process, the lithium salt and potassium salt in the elect...

AI Technical Summary

Problems solved by technology

The raw material alumina powder contains a certain amount of lithium salt and potassium salt. With the continuation of the electrolysis process, the lithium salt and potassium salt in the electrolyte system are continuously enriched. The content of lithium salt is about 4%, and the content of potassium salt is 2.5-3%. , the primary crystal temperature of the electrolyte melt drops, the degree of superheat increases, and abnormal conditions such as a significant drop in the bath temperature, an increase in carbon slag, an increase in the amount of electrolyte taken, an increase in precipitation, and an increase in the cathode pressure drop occur during the operation of the electrolytic cell, which have caused great harm to the electrolytic production. influences