Modified carbon anode and preparation method thereof

Abstract

The invention relates to a modified carbon anode, and belongs to the technical field of aluminum electrolysis cell anode development. The modified carbon anode comprises a modified carbon block 3 composed of a mixture of ordinary carbon particles and semi graphitic carbon particles, and the graphitic degree of the modified carbon block 3 ranges from 30% to 40%. A production method of the modified carbon anode comprises the steps that the semi graphitic carbon particles and the ordinary carbon particles are evenly mixed with a certain proportion of adhesives and then poured into a vibrating unit to be paved with a certain thickness, and then the modified carbon anode is machined and formed through high-frequency vibration. When the carbon anode is used in an aluminum electrolysis cell, the cycle without electrical conduction for a long time in the aluminum electrolysis cell due to the fact that the anode is replaced can be greatly shortened. The preparation technology is simple and practical, and industrialized application is convenient.

Description

Technical field [0001] The invention relates to a modified carbon anode and a preparation method thereof; it belongs to the technical field of aluminum electrolytic cell anode development. Background technique [0002] In the pre-baked anode aluminum electrolysis cell, the life cycle of the anode is 28~31d. When the anode reaches the life cycle, the thickness of the residual electrode is about 15~17cm. If you continue to use it, the anode steel claw will melt. Therefore, it is necessary According to the structure design and assembly of the pre-baked anode, the anode should be replaced in time while maintaining a certain residual electrode height, 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 impact on the "three fields", but the temperature field has the greatest impact. The normal and stable alu...

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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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