Pre-baked anode anti-oxidation coating capable of reducing energy consumption of aluminum electrolysis cell and preparation and application methods of pre-baked anode anti-oxidation coating

Abstract

The invention discloses a prebaked anode anti-oxidation coating for reducing energy consumption of an aluminum electrolysis cell and a preparation and application method thereof, and belongs to the field of novel energy-saving and consumption-reducing materials for electrolytic aluminum. The prepared coating comprises 45%-50% of aluminum oxide, 2%-3% of an alkali metal grain boundary fusing agent, 25%-30% of a reinforcing agent, 0.3%-0.8% of a coupling agent, 0.001% of a crystal form control agent and 16.2%-27.7% of a solvent. Wherein the alkali metal grain boundary fusing agent consists of plagioclase mineral powder, albite and sodium fluosilicate; the reinforcing agent is silica sol; the coupling agent is a silane coupling agent; the crystal form control agent is composed of ytterbium oxide and erbium oxide; the solvent is water. The coating has extremely strong adhesive force, densification sintering can be completed at the temperature of 400-420 DEG C, a compact and uniform sintering layer can be formed on the surface of a carbon anode, the outer surface of the carbon anode is effectively prevented from being oxidized and peeled off in the production process of an aluminum electrolysis cell, carbon residues are reduced, and therefore the electrolyte resistance is reduced, the effective polar distance is increased, and the energy consumption is reduced; meanwhile, the anode service life can be prolonged by one day, and the field workload is reduced.

Description

technical field [0001] The invention specifically relates to a pre-baked anode anti-oxidation coating for reducing energy consumption of an aluminum electrolytic cell and a preparation and application method thereof, belonging to the technical field of chemical coatings. Background technique [0002] In the cryolite-alumina dissolved salt electrolysis prebaked cell, the quality of the carbon anode directly affects the progress of electrolysis and the quality of the product. Excessive carbon residue; according to incomplete statistics, about 5 kg to 15 kg of carbon residue is discharged for each ton of primary aluminum produced. The generation of carbon residue can cause adverse effects such as an increase in the voltage drop of the electrolyte, the generation of a hot bath, and an increase in the power loss of aluminum electrolysis production. In particular, the generation of the hot cell not only causes unnecessary consumption of electric energy, but also damages the catho...

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Problems solved by technology

Due to the specific selection of formulas, they not only have different effects in terms of carbon slag production and power consumption, but also have no energy-saving effect.

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