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Aluminum electrolysis prebaked anode carbon block coating anti-oxidation method

A technology for pre-baked anode and aluminum electrolysis, which is applied in the field of anode carbon block production in aluminum electrolysis cells, can solve the problems that coatings cannot effectively reduce the pre-baked anode carbon block, the amount of spraying materials is large, and it is not widely used. The effect of low price, less material and convenient material acquisition

Active Publication Date: 2019-08-09
贵州铝城铝业原材料研究发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Due to the uneven surface of the carbon block and the porous cracks, in order to ensure the effect of isolating the air, the amount of spraying materials is large, and multi-layer spraying is required. The thickness of the coating is large, and the thickness of the existing coating can reach 2-3mm. Leading to the introduction of more impurities, affecting the quality of aluminum water;
[0005] 2. The sprayed protective layer working in a high-temperature electrolytic environment for up to 30 days is prone to complete peeling and damage in large areas. At the same time, due to the existence of cracks in the pores of the carbon block, the sprayed layer will also be damaged during this process. Destruction of the coating cannot effectively reduce the surface oxidation of the prebaked anode carbon block in the electrolytic cell;
[0006] 3. Surface spraying and other methods have not been widely used in the aluminum electrolysis industry so far because of their poor protection effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: A kind of anti-oxidation method of aluminum electrolysis pre-baked anode carbon block covered with foil; using tar as adhesive, on the surface of pre-baked anode carbon block, after using adhesive to cover a layer of carbon fiber cloth, before bonding Water glass is used to spray on both sides of the carbon fiber cloth to form an anti-oxidation layer.

Embodiment 2

[0027] Embodiment 2: A kind of anti-oxidation method of aluminum electrolysis prebaked anode carbon block covered with foil; use resin as adhesive, after adopting adhesive to cover a layer of carbon fiber cloth on the surface of prebaked anode carbon block, before bonding A mixture of water glass and alumina powder is sprayed on both sides of the carbon fiber cloth to form an anti-oxidation layer, wherein the anti-oxidation layer: the mass fraction of aluminum oxide powder in water glass is 20%.

Embodiment 3

[0028]Embodiment 3: A kind of anti-oxidation method of aluminum electrolysis pre-baked anode carbon block covered with foil; use asphalt as adhesive, after adopting adhesive to cover a layer of carbon fiber cloth on the surface of pre-baked anode carbon block, before bonding A mixture of water glass and sodium fluoride powder is sprayed on both sides of the carbon fiber cloth to form an anti-oxidation layer, wherein the anti-oxidation layer: the mass fraction of sodium fluoride powder in water glass is 40%.

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PUM

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Abstract

The invention discloses an aluminum electrolysis prebaked anode carbon block coating anti-oxidation method. The surface of a pre-baked anode carbon block is coated with a layer of metal foil or carbonfiber cloth by adopting an adhesive, and the surface of the metal foil or carbon fiber cloth is coated with an anti-oxidation layer. The aluminum electrolysis prebaked anode carbon block coating anti-oxidation method has the beneficial effects that the surface of the carbon block is isolated from air flowing in an electrolytic cell, reliable prevention or alleviation of oxidation of the surface of the carbon block is realized, normal use can be realized in the high-temperature electrolysis environment, the use amount is small, the influence on the quality of aluminum water is small, the environment is protected, energy is saved, and consumption is reduced.

Description

technical field [0001] The invention relates to a production method of an anode carbon block of an aluminum electrolytic cell, in particular to a foil-coated anti-oxidation method for an aluminum electrolytic prebaked anode carbon block. Background technique [0002] The existing aluminum electrolysis production adopts the carbon prebaked anode production method for production, and all use powdery and granulated alumina insulation covering materials for insulation coverage. During the electrolysis production process, the prebaked anode carbon block is always at high temperature State, powdery and small granular thermal insulation covering materials cannot isolate the air, and the surface of the high-temperature carbon block is in contact with the flowing air, causing a large amount of oxidation on the surface of the prebaked anode carbon block, and the loss of carbon material is as high as 25kg per ton of aluminum. In addition, the exfoliated carbon particles caused by surfa...

Claims

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Application Information

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IPC IPC(8): C25C3/12
CPCC25C3/125
Inventor 邹建明邹铜华
Owner 贵州铝城铝业原材料研究发展有限公司
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