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Method for preparing TiB2 cathode coating for aluminium electrolysis

A cathode coating and aluminum electrolysis technology, which is applied in the field of preparation of TiB2 cathode composite coating materials for aluminum electrolytic cells, can solve the problems of inability to realize large-scale production, difficulty in applying aluminum electrolysis production, and high cost of cathode products, and achieve production processing Low cost, improved electrolytic current efficiency, and reduced labor intensity

Active Publication Date: 2011-10-12
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thanks to TiB 2 The price is expensive, and the cost of the produced cathode products is also very high, so it is difficult to apply to the production of aluminum electrolysis; moreover, this technology has obvious defects in the realization of large-scale materials, special-shaped structure design, etc., and it cannot realize large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to TiB 2 Weight percent content of coating composite, TiB 2 , petroleum coke and carbon fiber were crushed and ball-milled several times to obtain a solid powder with a particle size of 10-50 μm, and put it in the kneading equipment at a ratio of 20:50:3 by weight, start the kneader, and mix for 2 hours to obtain a uniform solid powder mix. Fully mix the weighed asphalt and acetone in the container according to the ratio of 20:7 by weight to obtain a mixture with certain fluidity, pour it into the kneading equipment for solid-liquid kneading for 5 hours, and control the kneading temperature to 50°C . Obtain the TiB needed for aluminum electrolysis 2 composite material.

[0020] The composite material is hand-applied on the surface of the cathode carbon block of the entire electrolytic cell, smoothed and cured. The composite-coated cathode cell is then applied to the electrolytic aluminum system.

[0021] Implementation results: 25°C, TiB 2 The electrica...

Embodiment 2

[0023] According to TiB 2 Weight percent content of coating composite, TiB 2 , metallurgical coke, and carbon fiber were crushed to 10-30 μm by crushing ball mill several times, and put in the kneading equipment according to the ratio of 25:43:5 by weight. Start the kneader and mix for 3 hours to obtain a uniform solid powder mixture. After the phenolic resin and diethylenetriamine are fully stirred and mixed in the container according to the ratio of 22:5 by weight, a mixture with certain fluidity is obtained, which is poured into the kneading equipment for solid-liquid kneading for 10 h, and the kneading temperature is controlled at 80 ℃. Obtain the TiB needed for aluminum electrolysis 2 composite material.

[0024] The composite material is hand-applied on the surface of the cathode carbon block of the entire electrolytic cell, smoothed and cured. The composite-coated cathode cell is then applied to the electrolytic aluminum system.

[0025] Implementation results: 25°...

Embodiment 3

[0027] According to TiB 2 Weight percent content of coating composite, TiB 2 1. Electric calcined anthracite is crushed to 10-80 μm by crushing ball mill for several times, and placed in the kneading equipment according to the ratio of 30:43 by weight. Start the kneader and mix for 2 hours to obtain a uniform solid powder mixture. Anthracene oil and ethanol were fully stirred and mixed in a container according to the ratio of 26:1 by weight to obtain a mixture with certain fluidity, which was poured into a kneading equipment for solid-liquid kneading for 18 h, and the kneading temperature was controlled at 40 °C. Obtain the TiB needed for aluminum electrolysis 2 composite material.

[0028] The composite material is hand-applied on the surface of the cathode carbon block of the entire electrolytic cell, smoothed and cured. The composite-coated cathode cell is then applied to the electrolytic aluminum system.

[0029] Implementation results: 25°C, TiB 2 The electrical cond...

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Abstract

The invention provides a method for preparing a TiB2 cathode coating for aluminium electrolysis. The method comprises the following steps: grinding such materials as TiB2, a carbon-based material, an additive and the like, then mixing the ground materials proportionally and further mixing the ground materials uniformly in mixing and kneading equipment to obtain a solid powder mixture; adding a diluent into an adhesive, continuously stirring the two materials until the two materials are fully mixed uniformly; and pouring the uniformly mixed mixture of the diluent and the adhesive into the mixing and kneading equipment, nixing the mixed mixture of the diluent and the adhesive with the solid powder mixture and stirring the materials until the materials are mixed uniformly, thus obtaining the TiB2 composite required for aluminium electrolysis. The method has the following beneficial effects: after the product produced by the method is used in an aluminium electrolytic cell, the service life of the aluminium electrolytic cell is greatly prolonged and simultaneously the current efficiency of an aluminium electrolysis process is greatly improved, thus lowering the production cost of aluminium per ton; and the method has the advantages of short process flow, low production treatment cost and low environmental pollution.

Description

technical field [0001] The invention relates to a preparation method of a cathode coating for aluminum electrolysis. Especially aluminum electrolytic cell TiB 2 A method for preparing a cathode composite coating material. Background technique [0002] Aluminum smelting electrolysis is the only industrial aluminum smelting method in the world today. It uses the cryolite-alumina molten salt electrolysis method to smelt aluminum. The current carbon cathode does not wet the molten metal aluminum. In order to keep the surface of the molten metal aluminum cathode stable, a considerable thickness of aluminum liquid must be kept in the current aluminum electrolytic cell. Metal aluminum liquid is the conductive fluid in the tank. Under the action of strong magnetic field, electromagnetic force is induced in the conductive fluid, which makes the aluminum liquid flow, fluctuate and bulge. This not only makes it necessary to maintain a relatively high pole distance between the cathode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/08
Inventor 谢刚俞小花苏其军于站良
Owner KUNMING METALLURGY INST
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