Carbon element anode oxidation resistance layer for aluminium electrolysis and coating method thereof

An anti-oxidation layer and carbon anode technology, applied in the field of aluminum electrolysis, can solve problems such as the difference in the thermal expansion rate of the coating and the substrate carbon, and the restriction of high-temperature anti-oxidation performance, and achieve the effects of low cost, reduced carbon consumption, and increased carbon content.

Inactive Publication Date: 2008-08-27
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the anti-oxidation coating of this invention reduces a certain amount of carbon consumption, there is still a certain difference in the thermal expansion rate between the coating and the matrix carbon, which restricts the application of its high-temperature anti-oxidation performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of coating slurry:

[0039] 1) Weigh 400 grams of water, 300 grams of bisphenol A water-based epoxy resin, 200 grams of 3 μm boron carbide, 350 grams of 70 μm alumina, 150 grams of alumina sol with a solid content greater than 5% and 1.5 grams of DF-568 Antifoaming agent, mixed evenly at room temperature to prepare bottom coating slurry for use;

[0040] 2) Weigh 500 grams of water, 150 grams of bisphenol A water-based epoxy resin, 20 grams of 3 μm boron oxide, 30 grams of 3 μm boric acid, 450 grams of 70 μm alumina, 100 grams of 10 μm pseudoboehmite, 250 Alumina sol with a solid content greater than 5% and 2 grams of DF-568 defoamer are mixed evenly at room temperature to prepare a barrier layer coating slurry for use;

[0041] 3) Weigh 300 grams of water, 50 grams of bisphenol A water-based epoxy resin, 40 grams of 3 μm boron oxide, 20 grams of 3 μm boron carbide, 650 grams of 70 μm alumina, and 240 grams of alumina with a solid content greater than 5...

Embodiment 2

[0049] (1) Preparation of coating slurry:

[0050] 1) Weigh 500 grams of water, 500 grams of bisphenol A water-based epoxy resin, 50 grams of boron carbide of 5 μm, 100 grams of boron oxide of 1 μm, 300 grams of alumina of 20 μm, and 50 grams of alumina with a solid content of 10%. The sol and 1.5 grams of DF-558 defoamer were mixed evenly at room temperature to prepare a primer coating slurry for use;

[0051] 2) Weigh 500 grams of water, 200 grams of bisphenol A water-based epoxy resin, 100 grams of 2 μm boron oxide, 350 grams of 50 μm alumina, 100 grams of 15 μm pseudoboehmite, and 250 grams of 10% solid content Aluminum oxide sol and 2 grams of DF-558 defoamer were mixed uniformly at room temperature to prepare a barrier layer coating slurry for use;

[0052] 3) Weigh 300 grams of water, 50 grams of bisphenol A water-based epoxy resin, 20 grams of 1 μm boric acid, 750 grams of 10 μm alumina, 180 grams of alumina sol with a solid content of 10% and 3 grams of DF-568 disinf...

Embodiment 3

[0060] (1) Preparation of coating slurry:

[0061] 1) Weigh 400 grams of water, 400 grams of bisphenol A water-based epoxy resin, 100 grams of 3 μm boron carbide, 50 grams of 3 μm boron oxide, 100 grams of 5 μm boric acid, 150 grams of 25 μm alumina, 20 grams of solid content of 6% alumina sol and 1 gram of CLT-371 defoamer were mixed evenly at room temperature to prepare a primer coating slurry for use;

[0062] 2) Weigh 300 grams of water, 170 grams of bisphenol A water-based epoxy resin, 30 grams of 4 μm boron carbide, 500 grams of 30 μm alumina, 50 grams of 8 μm pseudoboehmite, and 250 grams of 6% solid content Aluminum oxide sol and 2 grams of DF-558 defoamer were mixed uniformly at room temperature to prepare a barrier layer coating slurry for use;

[0063] 3) Weigh 300 grams of water, 150 grams of bisphenol A water-based epoxy resin, 50 grams of 5 μm boron oxide, 650 grams of 10 μm alumina, 150 grams of alumina sol with a solid content of 6% and 2 grams of CLT-371 Def...

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Abstract

The invention discloses an aluminium electrolysis used carbon anode antioxidation layer with good associativity with a carbon anode basal body, excellent antioxidation performance and low cost. The invention also discloses a method for coating the antioxidation layer. The aluminium electrolysis used carbon anode antioxidation layer of the invention comprises the antioxidation layer of a bottom layer, the antioxidation layer of a barrier layer and the antioxidation layer of a surface layer from bottom to top. The method for coating the aluminium electrolysis used carbon anode antioxidation layer comprises following steps: firstly, spraying slurry coating of the bottom layer once or twice, wherein spraying time interval is 2 to 3 hours, drying under normal temperature, secondly, spraying the slurry coating of the barrier layer twice or three times, wherein the spraying time interval is 2 to 3 hours, drying under the normal temperature, thirdly, spraying the slurry coating of the surface layer once or twice, wherein the spraying time interval is 2 to 3 hours, and drying under the normal temperature.

Description

(1) Technical field: [0001] The invention relates to the field of aluminum electrolysis, in particular to a carbon anode anti-oxidation layer for aluminum electrolysis; the invention also relates to a coating method of the anti-oxidation layer. (two) background technology: [0002] In the process of aluminum electrolysis, the carbon anode not only undertakes the conductive function, but also participates in the electrochemical reaction and continuous consumption, which has a very important impact on the technical and economic indicators and the quality of primary aluminum, so it is called the "heart of the aluminum electrolytic cell". ". The working environment of the aluminum electrolytic carbon anode is a high-temperature aluminum electrolytic cell. According to the temperature distribution of the aluminum electrolytic cell, the anode temperature gradually decreases from the bottom to the top. The bottom temperature is about 900°C, and the top temperature is about 450°C. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12
Inventor 李庆余王红强张艳伟黄芬芬杨建红
Owner GUANGXI NORMAL UNIV
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