Aluminum electrolysis prebaked anode carbon block coating anti-oxidation method

Abstract

The invention discloses an aluminum electrolysis prebaked anode carbon block coating anti-oxidation method. The surface of a pre-baked anode carbon block is coated with a layer of metal foil or carbonfiber cloth by adopting an adhesive, and the surface of the metal foil or carbon fiber cloth is coated with an anti-oxidation layer. The aluminum electrolysis prebaked anode carbon block coating anti-oxidation method has the beneficial effects that the surface of the carbon block is isolated from air flowing in an electrolytic cell, reliable prevention or alleviation of oxidation of the surface of the carbon block is realized, normal use can be realized in the high-temperature electrolysis environment, the use amount is small, the influence on the quality of aluminum water is small, the environment is protected, energy is saved, and consumption is reduced.

Description

technical field [0001] The invention relates to a production method of an anode carbon block of an aluminum electrolytic cell, in particular to a foil-coated anti-oxidation method for an aluminum electrolytic prebaked anode carbon block. Background technique [0002] The existing aluminum electrolysis production adopts the carbon prebaked anode production method for production, and all use powdery and granulated alumina insulation covering materials for insulation coverage. During the electrolysis production process, the prebaked anode carbon block is always at high temperature State, powdery and small granular thermal insulation covering materials cannot isolate the air, and the surface of the high-temperature carbon block is in contact with the flowing air, causing a large amount of oxidation on the surface of the prebaked anode carbon block, and the loss of carbon material is as high as 25kg per ton of aluminum. In addition, the exfoliated carbon particles caused by surfa...

AI Technical Summary

Problems solved by technology

[0004] 1. Due to the uneven surface of the carbon block and the porous cracks, in order to ensure the effect of isolating the air, the amount of spraying materials is large, and multi-layer spraying is required. The thickness of the coating is large, and the thickness of the existing coating can reach 2-3mm. Leading to the introduction of more impurities, affecting the quality of aluminum water;

[0005] 2. The sprayed protective layer working in a high-temperature electrolytic environment for up to 30 days is prone to complete peeling and damage in large areas. At the same time, due to the existence of cracks in the pores of the carbon block, the sprayed layer will also be damaged during this process. Destruction of the coating cannot effectively reduce the surface oxidation of the prebaked anode carbon block in the electrolytic cell;

[0006] 3. Surface spraying and other methods have not been widely used in the aluminum electrolysis industry so far because of their poor protection effect