Method for preparing aluminum electrolytic cell TiB2 cathode coating by adopting plasma spraying technology

An aluminum electrolytic cell and cathode coating technology, which is applied in coating, metal material coating process, melt spraying, etc. Combined with weak and other problems, the effects of reducing industrial voltage and secondary reaction probability, improving aluminum electrolysis production, and reducing production and processing costs are achieved.

Active Publication Date: 2014-01-22
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The faster the curing speed, the more intense the reaction, the larger the cracks and pores of the coating, resulting in weaker bonding between the coating and the carbon cathode, which is easy to fall off and affects the application effect of the cathode coating
And the brush coating is thicker, so that the electrolytic cell is subjected to a large thermal shock and uneven thermal stress when it is energized and fired, and the thermal stress is uneven, which eventually leads to early peeling off of the coating.
In addition, the process is complicated, the construction is difficult, and the time is long, which seriously hinders the TiB 2 Popularization and Application of Cathode Coating

Method used

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  • Method for preparing aluminum electrolytic cell TiB2 cathode coating by adopting plasma spraying technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] TiB 2 、Al 2 o 3 , Put the graphite powder into a constant temperature drying oven, and dry at 120°C for 3-6 hours. TiB after drying 2 、Al 2 o 3 And graphite powder by mass percentage is: TiB 2 60%, Al 2 o 3 30% and graphite powder 10%, added to the medium frequency induction furnace to form a eutectic. Particle size D after crushing, ball milling and further ultra-fine crushing 50 It is a 400-mesh material, which is added to the hopper of the plasma spraying equipment.

[0024] Start the main control system and manipulator of the spraying equipment for plasma spraying. Process parameters: use argon as the main gas plus secondary gas as hydrogen to jointly feed powder, the flow rate of the main gas is 2000L / h, the flow rate of the secondary gas is 20L / h; the working current is 550A, the working voltage is 70V; the flow rate of the powder feeder is 240L / h; spraying The moving speed of the equipment is 0.02m / s, and the distance between the nozzle and the substra...

Embodiment 2

[0027] TiB 2 、Al 2 o 3 and graphite powder into a constant temperature drying oven, and dried at 120°C for 3-6 hours. TiB after drying 2 、Al 2 o 3 And graphite powder by mass percentage is: TiB 2 60%, Al 2 o 3 20% and graphite powder 20%, add to high temperature roasting furnace to form eutectic. After crushing, ball milling and further ultra-fine grinding, the particle size D 50 It is 500 mesh, and it is added to the hopper of the plasma spraying equipment.

[0028] Start the main control system and manipulator of the spraying equipment for plasma spraying. Process parameters: use argon as the main gas and secondary gas as hydrogen to jointly feed powder, the flow rate of the main gas is 2500L / h, the flow rate of the secondary gas is 30L / h; the working current is 600A, the working voltage is 72V; the flow rate of the powder feeder is 320L / h; spraying The moving speed of the equipment is 0.08m / s, and the distance between the nozzle and the substrate is 9cm. The res...

Embodiment 3

[0031] TiB 2 、Al 2 o 3 and graphite powder into a constant temperature drying oven, and dried at 120°C for 3-6 hours. TiB after drying 2 、Al 2 o 3 And graphite powder by mass percentage is: TiB 2 80%, Al 2 o 3 10% and graphite powder 10%, add to high temperature roasting furnace to form eutectic. After crushing, ball milling and further ultra-fine grinding, the particle size D 50 It is 500 mesh, and it is added to the hopper of the plasma spraying equipment.

[0032] Start the main control system and manipulator of the spraying equipment for plasma spraying. Process parameters: use argon as the main gas plus secondary gas as hydrogen to jointly feed powder, the flow rate of the main gas is 3000L / h, the flow rate of the secondary gas is 35L / h; the working current is 650A, the working voltage is 75V; the flow rate of the powder feeder is 350L / h; spraying The moving speed of the equipment is 0.04m / s, and the distance between the nozzle and the substrate is 10cm. The r...

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Abstract

The invention discloses a method for preparing an aluminum electrolytic cell TiB2 cathode coating by adopting a plasma spraying technology. The method comprises the following steps: adding dried titanium boride powder, alumina powder and graphite powder in a high-temperature roasting furnace according to a certain ratio to form eutectic, crushing and ball-milling the eutectic, further performing ultrafine grinding on the eutectic, adding the ground the eutectic in a hopper of a plasma spraying device, starting a main control and mechanical arm of the spraying device, and controlling the distance between a nozzle and a substrate and the movement speed to form a TiB2 cathode coating composite on the surface of the aluminum electrolytic cell cathode carbon block. By adopting the method, the thickness of the TiB2 composite cathode coating in the industrial aluminum electrolytic cell can be effectively controlled, the industrial voltage of the aluminum electrolytic cell and the probability of secondary reactions can be reduced, the current efficiency can be effectively increased, the energy consumption can be reduced, the service life of the industrial aluminum electrolytic cell can be prolonged, the aluminum electrolysis production can be improved and the quality of aluminum products can be increased.

Description

technical field [0001] The invention relates to the preparation and coating method of an inert coating for the cathode of an industrial aluminum electrolytic cell, in particular to a method for preparing an aluminum electrolytic cell TiB by a plasma spraying method 2 Method of cathodic coating. Background technique [0002] Titanium boride (TiB 2 ) high melting point, high conductivity, good conductivity at high temperature, good compactness, high hardness, can resist the corrosion of molten aluminum and cryolite electrolyte, and has good wettability to molten aluminum. Now It has become the material of choice for the manufacture of wettable and inert cathode coatings for aluminum electrolytic cells. [0003] To make TiB 2 It can be firmly bonded on the surface of carbon cathode for aluminum electrolysis, usually in the form of TiB 2 Add thermosetting resin, curing agent and solvent to the paste in the cathode coating as the base material, and obtain a coated cathode tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/12C23C4/10C25C3/08C23C4/134C23C4/137
Inventor 谢刚于站良苏其军杨万章崔焱陈家辉许娜谢天鉴彭如振
Owner KUNMING METALLURGY INST
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