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Coating material for high-temperature oxidation prevention of carbon anode

A coating material and carbon anode technology, applied in the field of electrolytic aluminum, can solve the problems of insignificant anti-oxidation effect, poor coating durability, poor thermal shock resistance, etc., and achieve improved expansion coefficient matching, high refractoriness, The effect of improving toughness

Active Publication Date: 2021-10-29
河南和成无机新材料股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the existing coating material expansion coefficient does not match the carbon, poor thermal shock resistance, poor coating durability, anti-oxidation effect is not obvious, etc., the present invention proposes a high-temperature anti-oxidation coating for carbon anodes The material has good toughness, strong bonding force and strong thermal shock resistance, and has the characteristics of convenient construction, room temperature curing, low temperature densification, non-toxic environmental protection, durable and effective, and can significantly reduce the high temperature oxidation of carbon anodes. Burnout, prolonging the service life of the anode

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A coating material for high-temperature anti-oxidation of carbon anodes, the specific configuration scheme is as follows:

[0027] (1) Preparation of composite silicate solution:

[0028] Take 25g of sodium silicate powder, 74.5g of clear water, and 0.5g of aluminum hydroxide powder, stir and mix thoroughly, place in a stainless steel reactor, and stir for 15 hours at 100°C to obtain a composite silicate solution. The modulus of the sodium silicate is 2.5, and the median particle size D50 of the aluminum hydroxide powder is 8 μm.

[0029] (2) Preparation of inorganic binder:

[0030] Take 40g of aluminum sol, 50g of silica sol, and 10g of composite silicate solution, and fully stir and mix to obtain an inorganic binder.

[0031] (3) Preparation of composite ceramic filler:

[0032] Take 45g of alumina powder, 5g of kyanite powder, 25g of mullite powder, 10g of albite powder, 10g of aluminum silicate powder, and 5g of aluminum hydroxide, mix and stir for 30 minutes to...

Embodiment 2

[0043] A coating material for high-temperature anti-oxidation of carbon anodes, the specific configuration scheme is as follows:

[0044] (1) Preparation of composite silicate solution:

[0045] Take 35g of sodium silicate powder, 63g of clear water, and 2g of aluminum hydroxide powder, stir and mix thoroughly, place in a stainless steel reactor, and stir for 15 hours at 100°C to obtain a composite silicate solution. The modulus of the sodium silicate is 3.0, and the median particle size D50 of the aluminum hydroxide powder is 8 μm.

[0046] (2) Preparation of inorganic binder:

[0047] Take 70g of aluminum sol and 30g of composite silicate solution, stir and mix thoroughly to obtain a composite binder.

[0048] (3) Preparation of composite ceramic filler:

[0049] Take 20g of alumina, 20g of kyanite powder, 20g of mullite powder, 10g of albite powder, 10g of aluminum silicate powder, 10g of aluminum hydroxide, 5g of pearl clay, and 5g of halloysite, mix and stir for 30 min...

Embodiment 3

[0060] A coating material for high-temperature anti-oxidation of carbon anodes, the specific configuration scheme is as follows:

[0061] (1) Preparation of inorganic binder:

[0062] Take 60g of aluminum sol and 40g of silica sol, stir and mix thoroughly to obtain a composite binder.

[0063] (2) Preparation of composite ceramic filler:

[0064] Take 15g of alumina powder, 15g of kyanite powder, 15g of mullite powder, 5g of albite powder, 5g of aluminum silicate powder, 15g of aluminum hydroxide, 15g of pearl clay, and 15g of halloysite, and mix and stir for 30 minutes to obtain 100g of composite ceramic filler . The median particle size D50 of the above-mentioned ceramic powders is all less than 20 μm.

[0065] (3) prepare toughening agent:

[0066] Take 60 g of mullite whiskers, 10 g of yttrium silicate whiskers, and 30 g of aluminum silicate fibers and stir and mix evenly to prepare 100 g of toughening agent.

[0067] (4) preparation catalyst:

[0068] Take 90g of cr...

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Abstract

The invention provides a coating material for high-temperature oxidation prevention of a carbon anode. The coating material comprises the following components: 35-55 wt% of an inorganic binder, 30-60 wt% of a composite ceramic filler, 1-10 wt% of a catalyst, 0-1 wt% of a sintering agent and 1-10 wt% of a flexibilizer. The coating material disclosed by the invention has good toughness, relatively strong binding force and relatively strong thermal shock resistance, has the characteristics of convenience in construction, normal-temperature curing, low-temperature densification, no toxicity, environment friendliness, durability, effectiveness and the like, and can be used for remarkably reducing the high-temperature oxidation burning loss of a carbon anode and prolonging the service life of the anode.

Description

technical field [0001] The invention relates to the technical field of electrolytic aluminum, in particular to a coating material for high-temperature anti-oxidation of carbon anodes, which is used for improving the high-temperature anti-oxidation performance of prebaked anodes for electrolytic aluminum and prolonging the service life of prebaked anodes. Background technique [0002] In the process of molten salt electrolytic smelting metal aluminum, the prebaked carbon anode plays a conductive role and participates in the electrochemical reaction to be continuously consumed. The quality of the carbon anode directly affects the quality of electrolytic aluminum and the economic indicators of production. The temperature of the molten salt electrolyte in the electrolytic cell is 930-960°C, and the temperature of the prebaked carbon anode in the electrolytic cell is as high as 450°C-900°C. The carbon material will react with the surrounding air carbon dioxide above 450°C to gene...

Claims

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Application Information

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IPC IPC(8): C04B35/117C04B35/18C04B35/81C04B35/80C04B35/622C04B35/64C04B41/87C25C3/12
CPCC04B35/117C04B35/18C04B35/80C04B35/62222C04B35/64C04B41/87C04B41/009C04B41/5045C04B41/5035C04B41/5037C25C3/12C04B2235/3225C04B2235/3427C04B2235/3201C04B2235/3218C04B2235/3418C04B2235/3463C04B2235/3472C04B2235/349C04B2235/5228C04B2235/5436C04B2235/445C04B2235/5276C04B35/52C04B41/5031C04B41/5027C04B41/5024C04B41/4539C04B41/4596
Inventor 胡国静冯刚军
Owner 河南和成无机新材料股份有限公司
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