Anti-oxidation coating for pre-baked anode of aluminum cell

Abstract

The invention discloses an anti-oxidation coating for a pre-baked anode of an aluminum cell. The anti-oxidation coating for the pre-baked anode of the aluminum cell is prepared by the steps of blending an alumina sol, aluminum dihydrogen phosphate and other additive according to a certain proportion so as to obtain a sol, and mixing and compounding the sol and aluminum oxide with 40 meshes or moreto form the coating, wherein an anti-oxidation adhesive is prepared from 8 to 10 percent of alumina sol, 40 to 42 percent of aluminum dihydrogen phosphate, 55 to 60 percent of water, and not more than 1 percent of additive, and a cementing liquid is prepared by blending according to a certain proportion; the additive is a mixture of phosphate ester and aluminum oxide with the matching ratio being(55 to 65 percent) to (35 to 45 percent); the matching ratio of the anti-oxidation adhesive to the aluminum oxide is 4 to 1. The surface of the pre-baked anode is brush-coated or spray-coated, so that a layer of compact aluminum oxide thin film is formed on the surface of the pre-baked anode, has 1,000-DEG C high temperature resistance, higher adhesive strength and better film covering performance, and can effectively obstruct contact and oxidization of the pre-baked anode and air, so that the oxidation rate of the pre-baked anode is reduced.

Description

1. Technical field: [0001] The invention relates to an anti-oxidation coating for prebaked anodes of aluminum electrolytic cells, and belongs to the technical field of anti-oxidation treatment of prebaked anodes of aluminum electrolytic cells. 2. Background technology: [0002] The prebaked anode is the heart of the aluminum electrolytic cell. Its quality has a great influence on the production and operation of aluminum electrolysis, and also has a certain impact on the quality of primary aluminum. At the same time, it affects various economic indicators. The slag drop rate of the prebaked anode is a measure An indicator of the quality of prebaked anodes, the higher the slag drop rate, the greater the impact on aluminum electrolysis production, the greater the labor intensity of workers, and the lower the unit benefit. Therefore, reducing the amount of carbon slag in the electrolytic cell is an effective way to reduce the labor intensity of employees and improve the current ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an anti-oxidation coating for the prebaked anode of the aluminum electrolytic cell to solve the problem of prebaked anodic oxidation of the aluminum electrolytic cell after the anode is replaced