Fuel gas calcination method for secondary starting of aluminum electrolytic bath

Abstract

The invention discloses a fuel gas calcination method for secondary starting of an aluminum electrolytic bath. The method comprises the steps that the electrolytic bath is cleared; an anode carbon block is installed, and the electrolytic bath is arranged in a sealing and insulating manner; a combustor is installed and connected with a combustion station and a control station; before ignition is carried out, the calcination temperature control curve for secondary starting of the electrolytic bath is set; the ignition and combustion process is controlled; fuel gas calcination and the electrifying and starting technology after electrolyte is poured are stopped. According to the method, the heavy repair cost is saved, generation of heavy repair waste is reduced, the energy consumption is reduced, the life of the bath is effectively prolonged, the success rate of secondary starting of the electrolytic bath is increased to a great extent, compared with that of the traditional calcination technology, the success rate of secondary starting is improved to 80% from original 50%, better economic benefits and social benefits can be generated, and the method is easy to use and popularize.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolysis production technology, and in particular relates to a gas roasting method for secondary start-up of an aluminum electrolysis cell. Background technique [0002] When the electrolytic cell of the electrolytic aluminum factory encounters a long-term power outage or insufficient supply of electricity and materials, the production of the electrolytic cell series needs to be stopped. When the production conditions are met again, the electrolytic cell needs to be restarted, which is called an aluminum electrolytic cell. Before the second start, the electrolytic cell needs to be roasted. After roasting to a certain temperature, electrolyte is poured into the electrolytic cell to energize it. The purpose of roasting the electrolytic cell is to dry the moisture in the cathode lining of the electrolytic cell by gradually raising the temperature of the electrolytic cell. The temperature of the ...

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Problems solved by technology

At present, the common roasting method for aluminum electrolytic cells in my country is mainly the coke grain roasting method. The disadvantages of the coke grain roasting method in the process of use are: first, the corner of the electrolytic tank is slow to heat up, and the preheating of the sticky belt around the tank is poor. The uniformity of speed and temperature distribution cannot be effectively controlled; second, the soft connection of the electrolytic cell, the installation and removal of the shunt device, and the laying of coke particles complicate the operation process, which is labor-intensive and time-consuming; third, most of the carbon slag needs to be salvaged manually Increase the labor intensity of workers, and the power consumption of the entire roasting process is relatively large; Fourth, there will be uneven temperatures in the furnace and furnace bottom during the roasting process, and cracks are likely to occur between the cathode of the motor groove and the inner lining. Leakage of molten aluminum is prone to occur after startup

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