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Aluminum electrolysis carbon anode oxidation coating and coating method thereof

An anti-oxidation coating and carbon anode technology, applied in the field of aluminum electrolytic carbon anode anti-oxidation coating and its coating, can solve problems such as shedding, economic problems, and no industrial application, and achieve enhanced anti-oxidation ability and good moisturizing effect. wet effect

Active Publication Date: 2009-03-18
GUIZHOU BRANCH CHINA ALUMINUM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) Using alumina raw materials as a covering protective layer is a common method in aluminum electrolysis plants, but a loose and uneven alumina layer cannot ensure that carbon is isolated from air
(3) Some aluminum electrolysis plants use molten aluminum as a protective layer for carbon anodes, but this method has economic problems
0.8~1.0g / cm2 is required on the surface of the anode 2 The non-wetting of aluminum, aluminum and carbon leads to uneven coating and peeling off, which consumes aluminum and cannot prevent the oxidation of carbon
(4) To modify the carbon anode, the method of using suitable additives to reduce the oxidation activity of the anode has not been seen in industrial applications
These measures have technical or economic limitations

Method used

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  • Aluminum electrolysis carbon anode oxidation coating and coating method thereof
  • Aluminum electrolysis carbon anode oxidation coating and coating method thereof
  • Aluminum electrolysis carbon anode oxidation coating and coating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 (three-layer structure)

[0036] 1) Preparation of the first layer of coating: 27.6wt% water, 20.7wt% bisphenol A water-based epoxy resin, 15wt% boron carbide, 2.2wt% boric acid, 24.1wt% alumina, 10.3wt% solid content greater than 5wt % alumina sol and 0.1wt% DF568 defoamer, mixed uniformly at room temperature to prepare coating slurry;

[0037] 2) Preparation of the second layer of coating: 28.0wt% water, 8.8wt% bisphenol A water-based epoxy resin, 9wt% boron carbide, 6wt% boric acid, 26.8wt% alumina, 6.3wt% pseudoboehmite 15wt% alumina sol with a solid content greater than 5wt% and 0.1wt% DF568 defoamer, mixed uniformly at room temperature to prepare a coating slurry;

[0038] 3) Preparation of the third layer of coating: 22.0wt% water, 3.7wt% bisphenol A water-based epoxy resin, 4.5wt% boron carbide, 7.4wt% boron oxide, 44.8wt% aluminum oxide, 17.5wt% solid content More than 5wt% alumina sol and 0.1wt% DF568 defoamer are mixed uniformly at room tempera...

Embodiment 2

[0042] Embodiment 2: (four-layer structure)

[0043] 1) Preparation of the first layer of coating: 29.4wt% water, 20.4wt% bisphenol A waterborne epoxy resin, 14.7wt% boron carbide, 5.9wt% boron oxide, 17.6wt% aluminum oxide, 11.9wt% are 5wt% alumina sol and 0.1wt% DF558 defoamer were mixed uniformly at room temperature to prepare a coating slurry;

[0044] 2) Preparation of the second layer of coating: 25.0wt% water, 12.5wt% bisphenol A water-based epoxy resin, 8.0wt% boron carbide, 26.4wt% aluminum oxide, 5.0wt% boron oxide, 7.5wt% quasi-thin diaspore, 15.5wt% alumina sol with a solid content of 5wt%, and 0.1wt% DF558 defoamer were uniformly mixed at room temperature to prepare a coating slurry;

[0045] 3) Preparation of the third layer of coating: 33.0wt% water, 10.0wt% bisphenol A water-based epoxy resin, 5.0wt% boron carbide, 8.0wt% boron oxide, 28.0wt% aluminum oxide, 5.9wt% quasi-thin diaspore, 10.0wt% alumina sol with a solid content of 5wt% and 0.1wt% DF558 defoamer...

Embodiment 3

[0050] Embodiment 3 (five-layer structure)

[0051] 1) Preparation of the first layer of coating: 20.5wt% water, 11.6wt% bisphenol A water-based epoxy resin, 16.0wt% boron carbide, 4.0wt% boron oxide, 2wt% boric acid, 28.8wt% aluminum oxide, 17.0 Alumina sol with a solid content of 5wt% and 0.1wt% CLT-371 defoamer were mixed uniformly at room temperature to prepare a coating slurry;

[0052] 2) Preparation of the second layer of coating: 20.4wt% water, 11.6wt% bisphenol A water-based epoxy resin, 7.0wt% boron carbide, 31.0wt% aluminum oxide, 3.4wt% boric acid, 9.5wt% pseudo thin water Bauxite, 17.0wt% alumina sol with a solid content of 5wt% and 0.1wt% CLT-371 defoamer were uniformly mixed at room temperature to prepare a coating slurry;

[0053] 3) Preparation of the third layer of coating: 20.4wt% water, 9.0wt% bisphenol A water-based epoxy resin, 4.4wt% boron carbide, 6.5wt% boron oxide, 4.5wt% boric acid, 35.0wt% aluminum oxide, 3.5wt% pseudo-boehmite, 17.0wt% alumina so...

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Abstract

The invention relates to an oxidation resistant coating for aluminum electrolytic carbon anode and a coating method thereof. The method is characterized in that the surface of the aluminum electrolytic carbon anode is provided with an anti-oxidation coating formed by dried and mixed coat which is sprayed on the surface of the electrode, wherein the mixed coat comprises the following compositions in weight percentage: 1 to 25 percent of bisphenol A-type waterborne epoxy resin, 0.1 to 16 percent of boron carbide, 2 to 13 percent of boric acid and / or boric oxide, 15 to 50 percent of alumina, 0 to 20 percent of pseudo-boehmite, 10 to 30 percent of alumina sol, 0.1 to 0.3 percent of foam suppressor, and the balance being water. The coating and the method adopt an alumina-based gradient boron carbide oxidation resistant coating with a multilayer structure, and effectively blocks the contact of air and CO2 with carbon anode carbon, thereby avoiding or reducing excessive consumption of the carbon anode carbon. The method can realize carbon conservation by aluminum electrolytic prebaked anode by 10 to 20 kilogram / ton-Al.

Description

technical field [0001] The invention relates to an anti-oxidation coating of an aluminum electrolytic carbon anode and a coating method thereof. Background technique [0002] In the production 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 an extremely important impact on the technical and economic indicators and the quality of primary aluminum, so it is called "the key point of aluminum electrolytic cell". heart". Carbon anode consumption is one of the main components of primary aluminum production cost, accounting for about 15% of the total cost. [0003] At present, the technical work of domestic and foreign aluminum electrolysis enterprises to improve the oxidation resistance of carbon anodes and reduce carbon consumption indicators can be summarized as the following measures: (1) Improve the production quality of carbon anodes, st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12
Inventor 赖延清孟杰李庆余赵清杰吕晓军史志荣
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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