A modified carbon anode and its preparation method

Abstract

The invention relates to a modified carbon anode and belongs to the technical field of aluminum electrolytic cell anode development. The modified carbon anode designed in the present invention includes a modified carbon block 3 composed of a mixture of ordinary carbon particles and semi-graphitic carbon particles, and the degree of graphitization of the modified carbon block 3 is 30-40%. Its production method is to mix semi-graphitic carbon particles, ordinary carbon particles and a certain proportion of binder evenly, then pour them into a vibrating unit, spread them to a certain thickness, and then use high-frequency vibration to process and shape them. When the carbon anode designed by the present invention is used in an aluminum electrolytic cell, it can greatly shorten the long period of non-conduction in the electrolytic cell caused by the anode changing poles. The preparation process of the invention is simple, practical and convenient for industrial application.

Description

technical field [0001] The invention relates to a modified carbon anode and a preparation method thereof, belonging to the technical field of aluminum electrolytic cell anode development. Background technique [0002] In the prebaked anode aluminum electrolytic cell, the service period of the anode is 28-31 days. When the anode reaches the service period, the thickness of the residual electrode is about 15-17cm. If it continues to be used, the phenomenon of melting of the anode steel claw will occur. Therefore, it is necessary to According to the design and assembly of the prebaked anode structure, the anode should be replaced in time while maintaining a certain height of the anode residue, so as to ensure the normal and stable operation of the aluminum electrolytic cell. There are temperature field, material field and electromagnetic field in the aluminum electrolytic cell. The replacement of the anode has a certain influence on the "three fields", but the most influential...

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Problems solved by technology

With regard to improving the influence of the changing pole temperature on the cell condition, the methods adopted at present include the implementation of anode preheating, such as using the waste heat of the flue gas in the electrolytic cell to preheat the prebaked anode, but there is no report of successful application in China. The high-temperature residual anode is used to preheat the anode. There is only one utility model patent related to this technology, named "Anode block preheating exchange device", and the authorized announcement is CN201347457Y. During the implementation of this technology, a series of medium and high temperature The flue gas pipeline needs anti-corrosion treatment, and the anode preheating room needs to be built separately, which not only requires a large investment, but also has high operating costs.

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