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An electrolytic aluminum prebaked anode anti-oxidation insulating coating and preparation method thereof

A technology of prebaking anodes and insulating coatings, applied in anti-corrosion coatings, fire-proof coatings, coatings, etc., can solve the problems of anode slag dropping and short anode service life, and achieve enhanced adhesion, good dimensional stability, and high specific surface area Effect

Active Publication Date: 2021-03-16
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide an electrolytic aluminum prebaked anode anti-oxidation insulating coating, which is a slurry, which can solve the problems of short anode service life and serious anode slag drop in the aluminum electrolysis production process, and finally achieve high efficiency of electrolysis production operation, improving the current efficiency during electrolysis and reducing power consumption and other economic and technical indicators, and the coating will not have a negative impact on the electrolyte environment

Method used

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  • An electrolytic aluminum prebaked anode anti-oxidation insulating coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of 100kg electrolytic aluminum prebaked anodic anti-oxidation coating:

[0035] Nano-solvent binding phase: composed of silica sol, aluminum sol, silica-alumina sol and ethylene glycol, accounting for 26% of the total mass of the coating, a total of 26kg, of which the amount of silica sol is 20% of the nano-solvent binding phase, that is, 5.2kg; The amount of aluminum sol is 10% of the nano-solvent binding phase, i.e. 2.6kg; wherein the amount of silica-alumina sol is 1% of the nano-solvent binding phase, which is 0.26kg; wherein the amount of ethylene glycol is 69% of the nano-solvent binding phase, namely 17.94kg.

[0036] Main components: made of amorphous alumina, nano-scale ρ-Al 2 o 3 , Nanoscale γ-Al 2 o 3 and nanoscale α-Al 2 o 3 Composition, accounting for 70% of the total mass of the paint, a total of 70kg. Among them, amorphous alumina, nanoscale ρ-Al 2 o 3 , Nanoscale γ-Al 2 o 3 and nanoscale α-Al 2 o 3 The dosage accounts for 10%, 30...

Embodiment 2

[0046] Preparation of 100kg electrolytic aluminum prebaked anodic anti-oxidation coating:

[0047] Nano-solvent binding phase: composed of silica sol, aluminum sol, silica-alumina sol and ethylene glycol, accounting for 34% of the total mass of the coating, a total of 34kg, of which the amount of silica sol is 20% of the nano-solvent binding phase, that is, 6.8kg; The amount of aluminum sol is 10% of the nano-solvent binding phase, which is 3.4kg; the amount of silica-alumina sol is 1% of the nano-solvent binding phase, which is 0.34kg; the amount of ethylene glycol is 69% of the nano-solvent binding phase, which is 23.46 kg.

[0048] Main component: prepare 6.2kg of amorphous alumina, weigh nano-scale ρ-Al 2 o 3 , γ-Al 2 o 3 and α-Al 2 o 3 They are 18.6kg, 12.4kg, and 24.8kg respectively. The main component accounts for 62% of the total mass of the paint, ie 62kg.

[0049] Subcomponent: composed of spodumene, montmorillonite powder and rare earth, accounting for 2% of...

Embodiment 3

[0054] Preparation of 100kg electrolytic aluminum prebaked anodic anti-oxidation coating:

[0055] Nano-solvent binding phase: composed of silica sol, aluminum sol, silica-alumina sol and ethylene glycol, accounting for 30% of the total mass of the coating, a total of 30kg, of which the amount of silica sol is 20% of the nano-solvent binding phase, that is, 6kg; The amount of sol is 11% of the nano-solvent bound phase, that is, 3.3kg; the amount of silica-alumina sol is 1% of the nano-solvent bound phase, that is, 0.3kg; the amount of ethylene glycol is 68% of the nano-solvent bound phase, that is, 20.4kg .

[0056] Main component: prepare 6.8kg of amorphous alumina, weigh nano-scale ρ-Al 2 o 3 , γ-Al 2 o 3 and α-Al2 o 3 They are 20.4kg, 13.6kg, and 27.2kg respectively. The main component accounts for 68% of the total mass of the paint, ie 68kg.

[0057] Subcomponent: composed of spodumene, montmorillonite powder and rare earth, accounting for 1% of the total mass of th...

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Abstract

The invention provides an electrolytic aluminum prebaked anode anti-oxidation insulating coating. The electrolytic aluminum prebaked anode anti-oxidation insulating coating comprises the following components in percentage by mass: 60%-75% of a main component, 0.01%-5% of a secondary component, 24%-34% of a nano solvent binding phase and 0.01%-5% of a coating stabilizing phase, wherein the main component comprises amorphous aluminum oxide, nano-scale rho-Al2O3, nano-scale gamma-Al2O3 and nano-scale alpha-Al2O3. The insulating coating prepared by the invention can be cured at normal temperaturefor 6-8 hours after being sprayed to an anode by a spraying machine, the anode coating can form a compact net-shaped structure at the working temperature of 500-800 DEG C, the long-term tolerable temperature is over 900 DEG C, and the physical and chemical properties are stable.

Description

technical field [0001] The invention relates to the technical field of anodic insulating and anti-oxidation coatings, in particular to an electrolytic aluminum prebaked anode anti-oxidation insulating coating and a preparation method thereof. Background technique [0002] The carbon anode is the "heart" of the aluminum electrolytic cell, mainly made of petroleum coke, coke, asphalt and broken anode scraps. Carbon anode consumption is related to aluminum electrolysis process conditions and anode quality. Reducing carbon anode consumption is the top priority of electrolytic aluminum industry. Reducing carbon anode net consumption can improve current efficiency, increase aluminum production, reduce aluminum electrolysis power consumption, and make temperature distribution A more reasonable and extended carbon anode replacement cycle can ultimately improve the economic benefits of the aluminum plant. Therefore, all electrolytic aluminum plants are seeking various methods to redu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D1/00C09D5/25C09D5/08C09D7/80C09D7/65
CPCC09D1/00C09D5/00C09D5/08C09D5/18C09D7/65C09D7/80
Inventor 程本军李贺松李茂周长洞李卫霞
Owner CENT SOUTH UNIV
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