Graphite electrode coated with high temperature oxidation resistant ceramic paint and manufacture method thereof

A high-temperature anti-oxidation and graphite electrode technology, applied in the field of electrode production, can solve the problems of waste of high-quality carbon resources, restrict the development of the electrolytic aluminum industry, and increase production costs, and achieve the effects of small investment, convenient operation, and reduced electrode consumption

Inactive Publication Date: 2009-01-14
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a large gap between the carbon consumption of electrolytic aluminum anodes in my country and the international advanced level. According to literature reports, the net consumption of anodes abroad is 406kg / t-Al, while the average net consumption of electrolytic aluminum anodes in my country is 460kg / t- around Al
my country's electrolytic aluminum consumes about 36 tons more carbon anodes every year, which not only leads to an increase in production costs, but also causes a large amount of waste of non-renewable high-quality carbon resources, which seriously restricts the further development of my country's electrolytic aluminum industry

Method used

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  • Graphite electrode coated with high temperature oxidation resistant ceramic paint and manufacture method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of high-temperature oxidation-resistant ceramic coatings:

[0036] Feed according to the following formula:

[0037] Composition grams

[0038] Al(OH) 3 40

[0039] NaOH 18

[0040] water 20

[0041] al 2 o 3 20

[0042] Dispersant ammonium citrate 2

[0043] By the following method:

[0044] (1) Pour the above-mentioned NaOH into a clean beaker, add an appropriate amount of water and keep stirring; when the NaOH is completely dissolved, slowly add aluminum hydroxide Al(OH) into the beaker 3 Powder, stirred at 110°C for 8 minutes to make sodium metaaluminate binder;

[0045] (2) Al 2 o 3 After mixing with the dispersant, add water to make a uniform slurry;

[0046] (3) Add the slurry in step (2) to the sodium metaaluminate binder in step (1), adjust the viscosity to 0.1 Pa·s, and the pH value to 13 to obtain a high-temperature oxidation-resistant ceramic coating.

Embodiment 2

[0048] Preparation of high-temperature oxidation-resistant ceramic coatings:

[0049] Feed according to the following formula:

[0050] Composition grams

[0051] Al(OH) 3 40

[0052] NaOH 20

[0053] water 20

[0054] al 2 o 3 20

[0055] By the following method:

[0056] (1) Pour the above-mentioned NaOH into a clean beaker, add an appropriate amount of water and keep stirring; when the NaOH is completely dissolved, slowly add aluminum hydroxide Al(OH) into the beaker 3 Powder, stirred at room temperature for 30 minutes to make sodium metaaluminate binder;

[0057] (2) Al 2 o 3 Add the powder directly to the sodium metaaluminate binder in step (1), stir at 150°C for 10 minutes, adjust the viscosity to 20Pa·s, and pH to 11 to obtain a colloidal high-temperature oxidation-resistant ceramic coating.

Embodiment 3

[0059] Preparation of graphite electrodes coated with high-temperature oxidation-resistant ceramic coatings:

[0060](1) Pretreatment of the graphite electrode: the high-temperature anti-oxidation ceramic coating with a viscosity of 0.1Pa s obtained in the graphite electrode surface coating embodiment 1 step (3), dried at room temperature for 20 minutes;

[0061] (2) Coating: the high-temperature anti-oxidation ceramic coating that the viscosity that the above-mentioned (1) step is pretreated is coated with the graphite electrode surface that embodiment 2 step (2) makes is 20Pa·s, and coating thickness is 0.4mm;

[0062] (3) curing: the graphite electrode of step (2) was cured at room temperature for 4 hours;

[0063] (4) Drying: Dry the graphite electrode in step (3) at 70° C. for 12 hours to obtain a graphite electrode coated with a high-temperature anti-oxidation ceramic coating, which is used as a carbon anode produced by aluminum electrolysis.

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Abstract

The invention provides a high temperature anti-oxidation ceramic paint coated graphite electrode and a preparation method thereof. The high temperature anti-oxidation ceramic paint coated graphite electrode is characterized in that high temperature anti-oxidation ceramic paint is coated on the surface of an electrode, and the high temperature anti-oxidation ceramic paint is composed of the following components: 24 to 68 percent of Al(OH)3, 8 to 49 percent NaOH, 9 to 30 percent of water, 3 to 20 percent of Al2O3 and 0 to 5 percent of dispersing agent. A ceramic coating which can prevent oxygen from diffusing to the electrode surface is formed on the surface of a common electrode, thereby effectively protecting the electrode against being oxidized, and further reducing the electrode consumption and the production cost, at high temperature, the high temperature anti-oxidation ceramic paint can evaporate out the constitutional water in the sodium aluminum oxide bonding agent, which can form a porous structure, and have the functions of thermal retardation, heat isolation and noise elimination. The invention has the advantages that the process is simple, the operation is convention, the high temperature anti-oxidation ceramic paint coated graphite electrode is energy-saving, pollutant is not discharged, the investment is less, and the running cost is low.

Description

technical field [0001] The invention relates to a graphite electrode and a preparation method thereof, in particular to a graphite electrode coated with a high-temperature oxidation-resistant ceramic paint and a preparation method thereof, belonging to the technical field of electrode production. Background technique [0002] The large consumption of electrolytic anodes is one of the main reasons for the high cost of electrolytic production, accounting for about 15% of the total cost, and is an important indicator that every electrolytic production enterprise must assess. In 2006, the output of electrolytic aluminum in my country was 10 million tons. However, there is a large gap between the carbon consumption of electrolytic aluminum anodes in my country and the international advanced level. According to literature reports, the net consumption of anodes abroad is 406kg / t-Al, while the average net consumption of electrolytic aluminum anodes in my country is 460kg / t- Al or so...

Claims

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Application Information

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IPC IPC(8): C25C3/12
Inventor 严继康甘国友肖才巧杨萍孙加林
Owner KUNMING UNIV OF SCI & TECH
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