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Method for promoting carbon anode oxidation-resistant capability in aluminum electrolysis

A carbon anode and anti-oxidation technology, which is applied in the field of aluminum electrolysis industry, can solve the problems of not being able to effectively prevent air or oxygen from infiltrating, and not being able to protect

Inactive Publication Date: 2007-12-12
GUIZHOU BRANCH CHINA ALUMINUM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if this layer of mixture is loose, it cannot effectively prevent air or oxygen from infiltrating into the surface of the carbon anode and cannot protect the carbon anode.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0040] A coating composed of an organic binder is coated on the anode carbon block. It is implemented in several steps as follows:

[0041] (1) Weigh 620g of carbon powder, particle size less than 30μm; 100g of epoxy resin, model 6101; 50g of polyamide resin, model 203; 150g of furfuryl alcohol; 80g of ethanol.

[0042] (2) After putting graphite powder, furfuryl alcohol, and ethanol into the blender and mixing uniformly, polyamide resin is added in the mixture, and the liquid-solid ratio of the mixed coating is adjusted by adding 15g of ethanol again;

[0043] (3) Apply the mixed carbon glue layer on the five surfaces of the anode by spraying equipment or manual method, and the thickness of the coating layer is 1-2mm.

[0044] Place it under natural conditions for 8-12 hours to dry naturally.

[0045] (4) Weigh NaF / AlF 3 420g of cryolite with a molar molecular ratio of 3.0, 180g of alumina, 130g of epoxy resin, model 6101; 70g of polyamide resin, model 203; 150g of furfury...

example 2

[0050] Same as example 1 method, the primer formula used is: carbon powder 450g, epoxy resin 150g, polyamide resin 80g, furfuryl alcohol 200g, ethanol 120g; The outer coating formula used is: cryolite 340g, aluminum oxide 120g, epoxy Resin 150g, polyamide resin 80g, furfuryl alcohol 200g, ethanol 110g.

example 3

[0052]Same as example 1 method, the primer formula used is: carbon powder 650g, epoxy resin 50g, polyamide resin 20g, furfuryl alcohol 180g, ethanol 100g; The outer coating formula used is: cryolite 400g, aluminum oxide 160g, epoxy resin 120g, polyamide resin 60g, furfuryl alcohol 180g, ethanol 80g.

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PUM

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Abstract

The invention relates to a methd for increasing the anti- oxidizing performance of carbon anode for aluminum electrolysis, belonging to aluminum electrolytic industry technique. It comprises following steps: preparing bottom and exterior paint, coating prepared bottom paint on the surface of anode, the thickness is 1- 2mm, coating exterior paint on surface of anode after it is dry, the thickness is 1- 2mm. drying. The organic adhensive is used for coating, there is no foreign matter in raw material and no foreign element in electrolysis process, and the adhesiveness between the first layer and base material can be improved by carbon transition.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolysis industry, in particular to a method for improving the oxidation resistance of carbon anodes used in aluminum electrolysis. The method is mainly to develop a coating material coated on the surface of the aluminum electrolytic carbon anode, the coating can reduce the oxidation loss of the anode and prolong the service life of the anode. Background technique [0002] At present, the Hall-Elu method used in the aluminum electrolysis industry uses carbon anodes for the anodes. During electrolysis, the oxygen released by the decomposition of alumina consumes the anode oxidation. Theoretically, 333 kg of carbon is consumed for producing one ton of aluminum, while the actual consumption of carbon for each ton of aluminum produced by an aluminum plant is about 500-600 kg, of which the non-theoretical loss is mainly due to air oxidation loss and slag loss of. The electrolysis process releas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12
Inventor 石忠宁董少森王兆文史志荣徐君莉邓洁高炳亮胡清涛杨宏杰陈开斌
Owner GUIZHOU BRANCH CHINA ALUMINUM IND