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Prep. Process of cathode titanium boride coating for aluminum cell

An aluminum electrolytic cell and aluminum electrolysis technology, which is applied in the coating, curing and carbonization of thermosetting resin TiB2 cathode coating, and can solve the problems of block shedding, large thermal stress and high curing cost

Inactive Publication Date: 2004-10-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] ① Apply TiB with a brush or a soft-bristled roller 2 coating, on TiB 2 Coating exerts limited pressure, resulting in TiB 2 The coating on the cathode carbon lining of the aluminum electrolytic cell is often not completely wetted, because this wetting performance defect affects the TiB 2 Coating strength;
[0004] ②Electric oven curing coating requires additional investment and purchase of equipment for aluminum electrolysis plants, and the installation of equipment is troublesome and the curing cost is high;
[0005] ③ Aluminum liquid roasting and carbonization coating is to directly pour high-temperature aluminum liquid above 800 °C into a low-temperature aluminum electrolytic cell with a temperature of less than 100 °C, and then energize and roast the carbonization coating. This process has a large thermal shock and thermal stress. Causes carbonization of the coating, making the coating easy to fall off in early powder form or in partial block form

Method used

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Examples

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example

[0021] Example ①: Use a 4-inch paint brush to paint absolute ethanol on the surface of the cathode carbon lining, apply 0.1kg of absolute ethanol per square meter of cathode, and then use a trowel to complete the TiB in 3 times 2 Apply the paint; then hang the 1000×500×2mm steel plate on the edge of the aluminum electrolytic tank, install the gas (oil) roasting device, and cure the coating for 24 hours; then use the coke powder roasting device to roast the coating for 72 hours Hours, the temperature of the aluminum electrolytic cell was raised from room temperature to 950°C, and the coating was carbonized. Solved the problems existing in the preparation of cathode titanium boride coatings for aluminum electrolytic cells, avoiding TiB 2 The occurrence of early peeling off of the coating.

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Abstract

In the preparation of cathode titanium boride coating for aluminum electrolyzing tank, aluminum-electrolyzing gas or oil burning calciner is adopted and the coating is cured indirectly via steel plate conveying and heat dispersing. The coating is charred in an aluminum-electrolyzing coke calciner with strictly controlled technological parameters to improve the moistening property of the coating to the cathode carbon lining, raise the adhesion strength of the coating and avoid early peeling off of TiB2 coating.

Description

Technical field: [0001] The present invention is related to cathodes for aluminum electrolytic cells, in particular to thermosetting resin TiB 2 Coating, curing and carbonization of cathodic coatings. Background technique: [0002] The preparation of the existing cathode titanium boride coating for aluminum electrolysis is to first mix thermosetting resin and powdered TiB 2 Mix it to make a paint, and then paint it on the inner lining of the aluminum electrolytic cathode, then add an electric heating oven to the edge plate of the aluminum electrolytic cell to cure the coating, and finally roast and carbonize it with molten aluminum. It has the following deficiencies: [0003] ① Apply TiB with a brush or a soft-bristled roller 2 coating, on TiB 2 Coating exerts limited pressure, resulting in TiB 2 The coating on the cathode carbon lining of the aluminum electrolytic cell is often not completely wetted, because this wetting performance defect affects the TiB 2 Coating st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/08
Inventor 李劼李庆余刘永刚赖延清杨建红汤世泰唐骞林琳刘业翔
Owner CENT SOUTH UNIV