Method for adding aluminum fluoride into aluminum electrolytic cells

Abstract

The invention relates to a method for adding aluminum fluoride into aluminum electrolytic cells. Main factors affecting quality of aluminum electrolysis during production of electrolytic aluminum include electrolyte temperature, liquidus temperature, amount of added aluminum fluoride, voltage, aluminum output and the like. The method includes: setting normal control ranges of the electrolyte temperature, the liquidus temperature, the amount of added aluminum fluoride, the voltage and the aluminum output; sorting conditions occurring in aluminum electrolysis into nine; observing change of the electrolyte temperature, the liquidus temperature and noise value; adjusting amplitude of controlling the amount of added aluminum fluoride, the voltage and the aluminum output so as to control the whole process of aluminum electrolysis. The method is reasonable in design and effective, reduces waste of aluminum fluoride and lowers consumption of aluminum fluoride; and addition of the aluminum fluoride is normalized, stability of electrolyte compositions is maintained, superheat degree is stabilized, and current efficiency is improved.

Description

Technical field: [0001] The invention relates to a production method in the aluminum electrolysis industry, in particular to a method for adding aluminum fluoride to an aluminum electrolysis tank. Background technique: [0002] With the development of aluminum electrolysis today, energy saving and high efficiency are the inevitable way. Therefore, how to save energy and produce efficiently has become an industry research topic. At present, the domestic electrolytic aluminum industry still generally adopts the traditional operation process of high pole distance, low molecular ratio, and blindly pursuing low bath temperature. The obvious defect is still the high power consumption per ton of aluminum; Aluminum costs have been greatly affected. If the cell voltage is reduced too much, the heat balance of the electrolytic cell will be damaged due to the influence of the general electrolyte composition, and it will not be possible to maintain a regular and good internal shape o...

AI Technical Summary

Problems solved by technology

Chinese patent CN101109092A discloses an energy balance control method for an aluminum electrolytic cell, which controls the addition of aluminum fluoride through different settings of the initial crystal temperature of the electrolyte, but this solution solves the energy balance problem of the aluminum electrolytic cell. The addition of aluminum fluoride maintains the stability of the electrolyte composition, stabilizes the superheat, and improves the current efficiency.