Process method for roasting aluminum electrobath cathode inner lining by adopting shunting technology

Abstract

The invention provides a novel process method which utilizes heavy current of a power supply system in the production of an aluminum electrobath to roast and start an aluminum electrobath cathode inner lining. The method is used for roasting the aluminum electrobath cathode inner lining, overcomes the detects brought by the prior roasting and starting forms and ensures that the quality of the electrobath cathode inner lining after being roasted is balanced, and the current density distribution and the thermal stress distribution are evener, thereby achieving the aims of saving the electricity consumption of electrolytic aluminum and prolonging the service life of the electrobath.

Description

technology field; [0001] The invention is a new process method for firing and starting the cathode liner of the aluminum electrolytic cell by utilizing the high current of the aluminum electrolytic cell production power supply system. Background technique; [0002] The purpose of firing the aluminum electrolytic cell is to disperse and remove the moisture in the cell, to sinter and carbonize the tamping paste in the cell lining, to form a whole cathode lining, and to make the electrolytic cell reach a higher temperature suitable for the electrolytic cell to be energized and started. temperature. [0003] The commonly used electrolytic cell roasting methods include molten aluminum roasting, the combination of external resistance heating and molten aluminum roasting, carbon particle roasting and flame roasting. These roasting methods have their own advantages and disadvantages. Among them, the roasting method combined with external resistance heating and molten aluminum roast...

AI Technical Summary

Problems solved by technology

These roasting methods have their own advantages and disadvantages. Among them, the roasting method combined with external resistance heating and molten aluminum roasting has more advantages. It overcomes the thermal shock of molten aluminum roasting, which makes the cathode carbon block prone to cracks and rapid evaporation of water. The shortcomings of pores and pores can overcome the shortcomings of uneven roasting of carbon particles; but external resistance heating equipment requires external AC power supply and high-power transformer equipment. These equipment are not only large in size, expensive, and low in utilization, especially large aluminum electrolytic The application of the electrolytic cell is even more difficult to realize; although flame roasting also has the advantages of combining external resistance heating and aluminum liquid roasting, it is less safe and requires high sealing of the electrolytic cell, and it is easy to make the cathode lining oxidation

Using the current general electrolytic cell roasting method, the quality of the roasted aluminum electrolytic cell cathode lining is not only difficult to guarantee, which shortens the life of the cell, but also increases the power consumption per ton of aluminum production due to the uneven distribution of the current density of the cathode lining.